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Dust Nuisance at Fuel Feed System in AFBC boiler

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DUST NUISANCE AT FUEL FEED SYSTEMS IN <strong>AFBC</strong> BOILERS<br />

By K.K.Parthiban, Venus Energy Audit <strong>System</strong><br />

Introduction<br />

Few cases had come to us to solve the issue of dust nuisance <strong>at</strong> fuel feed system <strong>in</strong> <strong>AFBC</strong> <strong>boiler</strong>s. In<br />

some <strong>boiler</strong>s, two PA fans are provided <strong>in</strong> order to have reliability of the system. In some cases, both<br />

fans are be<strong>in</strong>g run <strong>in</strong> order to avoid chok<strong>in</strong>g problems <strong>in</strong> fuel l<strong>in</strong>es. This results <strong>in</strong> high power<br />

consumption by <strong>boiler</strong> auxiliaries. We had diagnosed these cases with eng<strong>in</strong>eer<strong>in</strong>g approach. In this<br />

paper we present how we have solved a case of dust nuisance. In a runn<strong>in</strong>g plant no one takes a risk<br />

unless there is a conviction to adopt a trial & improvement. The plant manager went ahead with us<br />

though the OEM was reluctant to take the risk.<br />

Photo 1: The dust nuisance experienced <strong>at</strong> PA l<strong>in</strong>es. The l<strong>in</strong>es get choked often and then<br />

dechok<strong>in</strong>g led to coal accumul<strong>at</strong>ions <strong>at</strong> feeder floor.<br />

Problem<br />

There are two <strong>AFBC</strong> <strong>boiler</strong>s <strong>at</strong> this plant. The plant uses Indonesian coal with total moisture of 25%.<br />

The surface moisture exceeds 15%. The fuel l<strong>in</strong>es used to get choked. There was dust nuisance due<br />

to this. OEM ma<strong>in</strong>ta<strong>in</strong>ed th<strong>at</strong> the surface moisture has to be limited to a maximum of 10%. There are<br />

<strong>in</strong>stall<strong>at</strong>ions with higher moisture levels, for e.g. Kutch & Neyveli Lignites.<br />

There were three stages of the diagnosis and improvement made <strong>in</strong> solv<strong>in</strong>g the problem. At the 1 st<br />

stage, the mix<strong>in</strong>g nozzles were studied <strong>in</strong>situ. Mix<strong>in</strong>g nozzle itself was used as flow meter. In 2 nd<br />

stage, the PA fan flow studies were done us<strong>in</strong>g pitot tube. In stage 3, new mix<strong>in</strong>g nozzles were<br />

<strong>in</strong>stalled and the performance improvements were realised.


PART 1- MIXING NOZZLE STUDIES<br />

The customer desired th<strong>at</strong> we do someth<strong>in</strong>g about the dust nuisance. We conducted air flow studies<br />

with and without coal. We even dismantled some mix<strong>in</strong>g nozzles to understand wh<strong>at</strong> makes to choke<br />

the l<strong>in</strong>es.<br />

Mix<strong>in</strong>g nozzle suction <strong>at</strong> thro<strong>at</strong><br />

We checked whether there is suction <strong>at</strong> venturi thro<strong>at</strong> area with & without fuel. We found th<strong>at</strong> there<br />

was +ve pressure when the fuel was dropped. Positive pressure <strong>at</strong> thro<strong>at</strong> can cre<strong>at</strong>e dust deposits <strong>in</strong><br />

fuel feed chutes. Slowly lumps beg<strong>in</strong> to form and these lumps <strong>in</strong>terrupt the fuel flow <strong>in</strong> l<strong>in</strong>es.<br />

Positive pressure could occur if the PA fan is undersized or if the thro<strong>at</strong> size is larger than<br />

requirement. Table below shows oper<strong>at</strong><strong>in</strong>g with two PA fans could cre<strong>at</strong>e more suction <strong>at</strong> thro<strong>at</strong>.<br />

PA damper %<br />

PA header pr,<br />

mmWC<br />

MX nozzle <strong>in</strong>let<br />

pr, mmWC<br />

Thro<strong>at</strong><br />

mmWC<br />

No coal – with one PA fan<br />

70% open 1030 990 -120 530<br />

100% 1092 1055 -170 530<br />

With coal- with one PA fan<br />

70% open 1028 990 ± 125 530<br />

100% 1075 1055 ± 90 530<br />

With coal- with two PA fans<br />

35% open 1300 1250 -260 to -60 560<br />

pr,<br />

MX nozzle<br />

outlet pressure,<br />

mmWC<br />

The mix<strong>in</strong>g nozzle works on the Bernoulli pr<strong>in</strong>ciple. Suction should be available <strong>at</strong> thro<strong>at</strong> when the<br />

fuel drops <strong>in</strong>. M<strong>in</strong>or pressuriz<strong>at</strong>ion up to + 25 mmWC can be accepted and will not be cre<strong>at</strong><strong>in</strong>g dust<br />

nuisance. If not, the fuel would back out caus<strong>in</strong>g troubles <strong>in</strong> l<strong>in</strong>e chok<strong>in</strong>g / feed chute chok<strong>in</strong>g.<br />

Sufficient suction would not develop when the air flow is less / mix<strong>in</strong>g nozzles are not as per design.<br />

PA fan capacity<br />

Then we checked th<strong>at</strong> the fan design parameters and we found th<strong>at</strong> the PA fan had good amount of<br />

marg<strong>in</strong> too. When we oper<strong>at</strong>ed two PA fans there was enough suction <strong>at</strong> thro<strong>at</strong>. There was a need to<br />

establish the air flow r<strong>at</strong>e tak<strong>in</strong>g place <strong>in</strong> present condition. This was because the fan was consum<strong>in</strong>g<br />

more power than wh<strong>at</strong> was as per test <strong>at</strong> MCR flow.<br />

Mix<strong>in</strong>g nozzle as a flow measurement device<br />

Venturi tube is a flow measur<strong>in</strong>g device and regularly be<strong>in</strong>g used by eng<strong>in</strong>eers. The Bernoulli<br />

pr<strong>in</strong>ciple is used here to measure the air flow. S<strong>in</strong>ce we measured the pressures <strong>at</strong> <strong>in</strong>let, outlet and <strong>at</strong><br />

thro<strong>at</strong> without / with air flow, the air flow can be calcul<strong>at</strong>ed us<strong>in</strong>g Bernoulli pr<strong>in</strong>ciple. The<br />

fundamental pr<strong>in</strong>ciple and our f<strong>in</strong>d<strong>in</strong>gs are as below.<br />

The tapp<strong>in</strong>gs available <strong>at</strong> mix<strong>in</strong>g nozzle <strong>in</strong>let, thro<strong>at</strong> and <strong>at</strong> outlet were provided with manometer.<br />

The pressure profiles were taken and presented <strong>in</strong> table 1. Apply<strong>in</strong>g Bernoulli equ<strong>at</strong>ion we could f<strong>in</strong>d<br />

out the air flow.


The theory<br />

As long as the fluid speed is sufficiently<br />

subsonic (V < mach 0.3), the<br />

<strong>in</strong>compressible Bernoulli's equ<strong>at</strong>ion (<br />

equ<strong>at</strong>ion 1) describes the flow. Apply<strong>in</strong>g<br />

Bernoulli equ<strong>at</strong>ion to air stream<br />

travell<strong>in</strong>g down the axis of the horizontal<br />

tube gives the equ<strong>at</strong>ion 2 & 3.<br />

2<br />

Va<br />

<br />

Pa<br />

gZ<br />

2<br />

2<br />

a<br />

P<br />

2<br />

b<br />

2<br />

Vb<br />

<br />

gZ<br />

2<br />

Va<br />

Vb<br />

<br />

Pa<br />

Pb<br />

( equ<strong>at</strong>ion<br />

2)<br />

2 2<br />

P<br />

P<br />

P<br />

Q <br />

<br />

a<br />

1<br />

2<br />

P<br />

b<br />

V<br />

2P<br />

<br />

Q C *<br />

2<br />

2<br />

Vb<br />

Va<br />

<br />

( equ<strong>at</strong>ion<br />

3)<br />

2 2<br />

2<br />

a<br />

<br />

A<br />

<br />

<br />

<br />

A<br />

a<br />

b<br />

<br />

<br />

<br />

2<br />

Aa<br />

<br />

A <br />

a<br />

<br />

<br />

<br />

<br />

Ab<br />

<br />

2 * P<br />

<br />

2<br />

<br />

1(<br />

equ<strong>at</strong>ion<br />

<br />

( equ<strong>at</strong>ion<br />

<br />

1<br />

<br />

Aa<br />

<br />

A <br />

a<br />

<br />

<br />

<br />

<br />

Ab<br />

<br />

2<br />

b<br />

( equ<strong>at</strong>ion1)<br />

4)<br />

5)<br />

( equ<strong>at</strong>ion<br />

<br />

1<br />

<br />

6)<br />

From cont<strong>in</strong>uity, the thro<strong>at</strong> velocity V b<br />

can be substituted out of the above<br />

equ<strong>at</strong>ion to give, Solv<strong>in</strong>g for the<br />

upstream velocity V a and multiply<strong>in</strong>g by<br />

the cross-sectional area A a gives the<br />

volumetric flow r<strong>at</strong>e Q,<br />

Ideal, non-viscous fluids would obey the<br />

above equ<strong>at</strong>ion. The small amounts of<br />

energy converted <strong>in</strong>to he<strong>at</strong> with<strong>in</strong><br />

viscous boundary layers tend to lower<br />

the actual velocity of real fluids<br />

somewh<strong>at</strong>. A discharge coefficient C is<br />

typically <strong>in</strong>troduced to account for the<br />

viscosity of fluids, C is found to depend<br />

on the Reynolds Number of the flow,<br />

and usually lies between 0.90 and 0.98<br />

for smoothly taper<strong>in</strong>g venturis.<br />

Higher PA header pressure results <strong>in</strong><br />

<strong>in</strong>creased pressure drop (ΔP) and thus<br />

the Q <strong>in</strong>creases. If PA header pressure is<br />

<strong>in</strong>creased and as the downstream<br />

pressure is fairly constant due to<br />

fluidized bed back pressure, the suction<br />

<strong>at</strong> thro<strong>at</strong> improves.<br />

Calcul<strong>at</strong>ion & <strong>in</strong>ference<br />

1. Us<strong>in</strong>g Bernoulli pr<strong>in</strong>ciple, we calcul<strong>at</strong>ed th<strong>at</strong> the l<strong>in</strong>e velocity to be as high as 24 m/s. Even then<br />

the suction was not enough. It meant the energy was not used up <strong>in</strong> cre<strong>at</strong><strong>in</strong>g good suction <strong>at</strong><br />

venturi.<br />

2. It was also seen th<strong>at</strong> the PA l<strong>in</strong>es were currently oper<strong>at</strong><strong>in</strong>g on high l<strong>in</strong>e velocities. The erosion<br />

seen <strong>in</strong> bed coils confirmed this. The erosion r<strong>at</strong>e was more where the coils were close the fuel<br />

nozzle cap.<br />

3. Two mix<strong>in</strong>g nozzles were dismantled & seen. The thro<strong>at</strong> diameters were measured to be 50 & 48<br />

mm. We recommended th<strong>at</strong> the mix<strong>in</strong>g nozzle is replaced with 42 mm thro<strong>at</strong> mix<strong>in</strong>g nozzles so<br />

th<strong>at</strong> the air flow is reduced simultaneously improv<strong>in</strong>g the suction.


4. From the current read<strong>in</strong>gs of PA fan, we could see th<strong>at</strong> the PA fan was oper<strong>at</strong><strong>in</strong>g with utterly low<br />

efficiency. We advised to carry out the performance test<strong>in</strong>g of PA fan <strong>in</strong>situ. The performance<br />

test done <strong>at</strong> fan manufacturers’ works would be with a test rack th<strong>at</strong> is done without IGV /<br />

without a suction box. There can be duct<strong>in</strong>g eng<strong>in</strong>eer<strong>in</strong>g defect which can cause poor<br />

performance of the PA fan. Many cases have been observed to be rel<strong>at</strong>ed to poor <strong>in</strong>let conditions.<br />

Photo 2 & 3: It is seen the protective co<strong>at</strong><strong>in</strong>g by phoscast is seen dislodged. Right above the<br />

fuel nozzles only the erosion is seen. This can happen due to high fuel l<strong>in</strong>e air flow.


PART 2: AIR FLOW MEASUREMENT IN PA DUCT SYSTEM BEFORE MIXING NOZZLE<br />

CHANGE<br />

The Fan supplier was reluctant to carry out the performance test, perhaps he knew the result would not<br />

be favorable to his company. In the meantime, we procured a pitot tube only to do it ourselves. The test<br />

was conducted on PA fans of both <strong>boiler</strong>s.<br />

Fundamentals of Pitot tube<br />

The picture below shows a S type pitot tube used for <strong>in</strong>ferr<strong>in</strong>g the velocity <strong>in</strong> a air / gas duct.<br />

The Pitot tube has two ports. One port faces fluid flow directly and hence measures the pressure and<br />

velocity head. The second port which faces downstream of flow measures only pressure head. Hence the<br />

differential pressure measured is noth<strong>in</strong>g but the velocity head. This equ<strong>at</strong>ion 1 is Bernoulli equ<strong>at</strong>ion. In<br />

a horizontal duct this Z 1 equals Z 2 . Hence equ<strong>at</strong>ion reduces to equ<strong>at</strong>ion 2.<br />

2<br />

V1<br />

<br />

V2<br />

<br />

P1 gZ1<br />

P2<br />

gZ<br />

2<br />

( equ<strong>at</strong>ion 1)<br />

2<br />

2<br />

2


2<br />

2<br />

2<br />

The front port measures the total head of ( P 1 + (V 1 ρ)/2 )<br />

V1<br />

V2<br />

<br />

P1 P2<br />

( equ<strong>at</strong>ion 2)<br />

2 2<br />

At port fac<strong>in</strong>g downstream we measure only st<strong>at</strong>ic pressure P 2<br />

and hence the differential pressure ΔP is noth<strong>in</strong>g but a measure of (V 2 1 *ρ / 2). Therefore V 1 = Sqrt ( ΔP<br />

* 2 /ρ). S<strong>in</strong>ce the ΔP is measured <strong>in</strong> mmWC (manometer fluid), conversion to actual fluid density is<br />

required. Pitot measurement is resorted to for fan performance studies / to resolve combustion problems.<br />

Details of Pitot study<br />

The velocity of air <strong>in</strong> PA fan discharge duct was <strong>in</strong>ferred us<strong>in</strong>g a Pitot tube meter. The measurements<br />

were taken through the tapp<strong>in</strong>gs <strong>in</strong> the duct along the length and height. The duct width and height were<br />

650 mm and 1000 mm respectively. The velocity measurements were carried out <strong>at</strong> various traverse<br />

po<strong>in</strong>ts and they were found to be approxim<strong>at</strong>ely equal. The measured differential pressure read<strong>in</strong>gs are<br />

given <strong>in</strong> table 1.<br />

Table 1: Differential pressure measurement read<strong>in</strong>gs by Pitot<br />

S.no ΔP<br />

(mmWc)<br />

ΔP<br />

(mmWC)<br />

Width Height<br />

wise wise<br />

1 14.9 14.6<br />

2 14.0 14.2<br />

3 15.2 14.8<br />

4 14.3 15.0<br />

5 15.5 14.3<br />

6 14.2 14.8<br />

7 14.3<br />

Avg 14.63 14.62<br />

Pitot tube<br />

Actual velocity <strong>in</strong>side duct, V = K p * C p * sqrt (ΔP (avg) ) * sqrt (T s / P s * M s )<br />

Kp, Dimensional constant = 34.97<br />

Cp, Pitot tube coefficient = 0.85<br />

ΔP(avg), Average differential pressure = 14.62 mmWC<br />

Ts, Temper<strong>at</strong>ure <strong>in</strong>side the duct = 433 K<br />

Ps, PA fan header pressure = 1054 mmWC (g) = 83.75 mmHg ( a)<br />

Ms, Molecular weight of air = 28.3<br />

V, Actual velocity, m/s = 34.97*0.85*sqrt (14.62)*sqrt(433/83.75*28.3))


=<br />

15.364 m/s<br />

Actual power consumption from voltage and current read<strong>in</strong>gs<br />

Power = sqrt (3) * V * I * Cos Ø<br />

V, Voltage = 430 V<br />

C, Current = 174 A<br />

Cos Ø, power factor = 0.85<br />

Power consumed by PA fan = sqrt (3) * 430 * 174 * 0.85<br />

= 110153 W<strong>at</strong>ts<br />

= 110.153 kW<br />

PA fan efficiency calcul<strong>at</strong>ed from Power consumption<br />

V, velocity of air flow = 15.364 m/sec<br />

A, duct flow area = (650 * 1000 / 10 6 ) m 2 = 0.65 m 2<br />

Q, PA fan flow = A * V = 9.98 m 3 /sec<br />

H, head developed by fan = discharge pressure - suction pressure<br />

= 1054 – 707 = 347 mmWc<br />

PA fan shaft power = (Q * H * 100)/ (efficiency * 101) kW<br />

PA fan motor power = 1.05 * shaft power<br />

Shaft power = PA fan motor power /1.05<br />

= 110.153/1.05<br />

= 104.90 kW<br />

Efficiency = (Q * H * 100)/ (motor shaft power *101)<br />

= (9.98 * 347 * 100) / (104.91 * 101)<br />

= 32.68 %<br />

FINDINGS AFTER THE PITOT TEST<br />

1. The actual flow from PA fan was gre<strong>at</strong>er than the r<strong>at</strong>ed flow. R<strong>at</strong>ed flow of PA fan was 8.43 m3/s,<br />

whereas actual flow was 9.98 m3/s.<br />

2. The PA l<strong>in</strong>e velocity as per calcul<strong>at</strong>ion was calcul<strong>at</strong>ed to be 24.3 m/s. This tallied with flow<br />

calcul<strong>at</strong>ed from venturi method. Design velocity for a PA l<strong>in</strong>e is 16 m/s.<br />

3. It was clear th<strong>at</strong> the new mix<strong>in</strong>g nozzles could be tried to improve the convey<strong>in</strong>g and to reduce the<br />

erosion of bed coils.<br />

4. The low efficiency of PA fan could be due to poor <strong>in</strong>let duct condition of PA fan.


PART 3: STUDY OF NEW MIXING NOZZLE PERFORMANCE<br />

The new mix<strong>in</strong>g nozzles were procured and <strong>in</strong>stalled <strong>in</strong> <strong>boiler</strong> no 1. We took up the study on the<br />

performance of new mix<strong>in</strong>g nozzles as per customer requirement. At the time of test, both the <strong>boiler</strong>s<br />

were runn<strong>in</strong>g <strong>at</strong> full load. Boiler no 1 was runn<strong>in</strong>g with a s<strong>in</strong>gle ID fan. The <strong>boiler</strong> no 2 was be<strong>in</strong>g run<br />

with two PA fans. The two PA fans were be<strong>in</strong>g run <strong>in</strong> <strong>boiler</strong> no 2, <strong>in</strong> order to avoid l<strong>in</strong>e chok<strong>in</strong>g. The<br />

study <strong>in</strong>cluded the measurement of thro<strong>at</strong> pressure with & without coal. At the time of test<strong>in</strong>g the coal<br />

fired was hav<strong>in</strong>g <strong>in</strong>herent moisture of 14%. The total moisture of coal as received was 25%. Hence the<br />

surface moisture was <strong>in</strong> the range of 11%. By mix<strong>in</strong>g the fly ash to an extent of 3%, the resultant<br />

surface moisture is 10.67%.<br />

Measurement of PA fan flow r<strong>at</strong>e <strong>in</strong> Boiler 1 and check on fan efficiency<br />

The first study was on the need for the m<strong>in</strong>imum header pressure to make the thro<strong>at</strong> pressure neg<strong>at</strong>ive<br />

while feed<strong>in</strong>g coal. It was seen th<strong>at</strong> the thro<strong>at</strong> pressure could be made neg<strong>at</strong>ive even <strong>at</strong> 1200 mmWC<br />

header pressure with a w<strong>in</strong>d box pressure of 830 mmWC. At 1500 mmWC, higher suction pressures<br />

could be obta<strong>in</strong>ed. See photos <strong>at</strong> the end. At the fuel feeder <strong>in</strong>spection door, the suction was felt to be<br />

quite high.<br />

Though 1200 mmWC pressure was adequ<strong>at</strong>e, oper<strong>at</strong>ors preferred to keep 1500 mmWC. This was<br />

done, as it helped to keep the leg chutes & mix<strong>in</strong>g nozzle chutes free from blockages. Hence the PA<br />

flow was checked <strong>at</strong> 1300, 1400 and 1500 mmWC pressures. The follow<strong>in</strong>g are the f<strong>in</strong>d<strong>in</strong>gs.<br />

The air flow was measured to be 8.82, 7.67 & 7.49 m3/s when the header pressures were 1520,<br />

1404 & 1304 mmWC.<br />

The PA l<strong>in</strong>e velocities were calcul<strong>at</strong>ed to be 21.5, 18.7 & 18.3 m/s respectively.<br />

The PA fan current was measured to be 184, 171 & 164 amps, when the header pressures were<br />

1520, 1404 & 1304 mmWC respectively.<br />

The power consumed by the PA fan was 120.5, 111.9 and 107.4 kW, when the header pressures<br />

were 1520, 1404 & 1304 mmWC respectively.<br />

The head added by PA fan was 690, 574 & 474 mmWC, respectively.<br />

The PA fan efficiencies were worked out to be 50, 38.9 & 32.7 %, when the header pressures were<br />

1520, 1404 & 1304 mmWC respectively.<br />

The PA fan efficiencies as per predicted performance curve should have been 74, 76 & 76.5 %,<br />

when the header pressures were 1520, 1404 & 1304 mmWC respectively.<br />

Measurement of PA fan flow r<strong>at</strong>e <strong>in</strong> Boiler 2 and check on fan efficiency<br />

The first study was on the need for the m<strong>in</strong>imum header pressure to make the thro<strong>at</strong> pressure neg<strong>at</strong>ive<br />

while feed<strong>in</strong>g coal. It was seen th<strong>at</strong> the thro<strong>at</strong> pressure could be made neg<strong>at</strong>ive <strong>at</strong> 1260 mmWC header<br />

pressure. Two PA fans were to be run to achieve this effect. The air flow was measured us<strong>in</strong>g pitot<br />

tube.<br />

The head added by fan was 520 mmWC.<br />

The PA fan power consumed was 177.4 kw. The PA fan power consumed <strong>at</strong> <strong>boiler</strong> no 2 was 107.4<br />

kW to produce a m<strong>in</strong>imum suction <strong>at</strong> thro<strong>at</strong> of mix<strong>in</strong>g nozzle.<br />

Comparison of performance of new mix<strong>in</strong>g nozzle


The new mix<strong>in</strong>g nozzle had reduced the air flow as <strong>in</strong>dic<strong>at</strong>ed by the air flow measurement and the<br />

power consumption. The high suction th<strong>at</strong> could be cre<strong>at</strong>ed helped <strong>in</strong> suck<strong>in</strong>g the wet coal without<br />

caus<strong>in</strong>g a bridg<strong>in</strong>g effect and venturi thro<strong>at</strong>. The fuel feeder floor is now clean and the leg chute<br />

jamm<strong>in</strong>g by wet coal is reduced drastically. The fuel feeder was seen to be <strong>at</strong> high vacuum as can be<br />

seen from photographs.<br />

Comparison of power consumption by PA fan <strong>in</strong> <strong>boiler</strong> 1 & 2<br />

The new mix<strong>in</strong>g nozzle consumed 107.4 kW as aga<strong>in</strong>st 177.4 kW to produce the m<strong>in</strong>imum vacuum <strong>at</strong><br />

thro<strong>at</strong>. However the <strong>boiler</strong> oper<strong>at</strong>ors now preferred to keep higher header pressure so th<strong>at</strong> the bridg<strong>in</strong>g<br />

of wet coal <strong>in</strong> leg chute was reduced gre<strong>at</strong>ly. The power consumed for the same is 120.5 kW. On the<br />

net compar<strong>in</strong>g <strong>boiler</strong> 1 & 2, there is a power sav<strong>in</strong>g of 57 kW.<br />

Wh<strong>at</strong> could be the reason for reduced fan efficiency?<br />

For the condition of 1520 mmWC header pressure, the fan power should have been 86 kW only (with<br />

an efficiency of 70% as per fan performance curve) as aga<strong>in</strong>st present 120.5 kW. If the header<br />

pressure was only 1304 mmWC, with a fan efficiency of 70%, the fan power should have been only<br />

50 kW. At least one can say, there is a loss of 120.5-86 = 34.5 kW now by virtue of poor efficiency of<br />

PA fan. The reason can be defective <strong>in</strong>let conditions assum<strong>in</strong>g the impeller design is correct.<br />

<br />

<br />

<br />

It is possible th<strong>at</strong> the suction box is undersized produc<strong>in</strong>g an effect of 90 deg turn <strong>at</strong> <strong>in</strong>let of fan.<br />

Further the IGV provided <strong>at</strong> fan <strong>in</strong>let with a high entry velocity can be an added disadvantage. The<br />

preferred free length <strong>at</strong> front of fan has to be three times the <strong>in</strong>let diameter.<br />

The recircul<strong>at</strong>ion of air flow through standby fan is possible. Guillot<strong>in</strong>e g<strong>at</strong>e elim<strong>in</strong><strong>at</strong>es the<br />

possibility of recircul<strong>at</strong>ion.<br />

Problem bridg<strong>in</strong>g <strong>in</strong> mix<strong>in</strong>g <strong>in</strong>let chute & leg chute<br />

Dur<strong>in</strong>g the visit, the problem of leg chute chok<strong>in</strong>g was studied. When the mix<strong>in</strong>g nozzle develops<br />

neg<strong>at</strong>ive pressure, the fuel th<strong>at</strong> is fed <strong>in</strong>to the mix<strong>in</strong>g nozzle flows freely. In case of any occasion of<br />

chok<strong>in</strong>g <strong>at</strong> thro<strong>at</strong> cross by a coal powder lump, the positive pressure cre<strong>at</strong>ed <strong>at</strong> thro<strong>at</strong> leads to bridg<strong>in</strong>g<br />

of wet coal <strong>in</strong> the mix<strong>in</strong>g nozzle <strong>in</strong>let chute. This is unavoidable. On <strong>in</strong>spection of each chute <strong>at</strong><br />

mix<strong>in</strong>g nozzle <strong>in</strong>let, the follow<strong>in</strong>g po<strong>in</strong>ts were noted to be a concern for bridg<strong>in</strong>g of wet coal.<br />

<br />

<br />

<br />

It was seen th<strong>at</strong> the SS l<strong>in</strong>er pl<strong>at</strong>es were tack / stitch welded to chutes. These weld beads offered as<br />

sites for the dust to build up. Instead of l<strong>in</strong>er pl<strong>at</strong>es, the chute should have been made of SS pl<strong>at</strong>es.<br />

Or else the l<strong>in</strong>er pl<strong>at</strong>es should have been plug welded from back, through some drilled holes <strong>in</strong> the<br />

chute.<br />

It was seen th<strong>at</strong> the flange sett<strong>in</strong>g was not proper <strong>in</strong> a chute th<strong>at</strong> was removed for <strong>in</strong>spection.<br />

It was seen th<strong>at</strong> the pack<strong>in</strong>g ropes were project<strong>in</strong>g <strong>in</strong>side the coal flow p<strong>at</strong>h. These can form sites<br />

for coal dust to build up.<br />

F<strong>in</strong>al conclusion<br />

<br />

<br />

<br />

The mix<strong>in</strong>g nozzles have met the <strong>in</strong>tentions of its purpose of achiev<strong>in</strong>g suction effect with lesser<br />

air flow.<br />

The mix<strong>in</strong>g nozzle <strong>in</strong>let chutes need to be corrected for smooth flow of coal.<br />

The PA fan needs a properly designed suction box to reduce the power consumption.


Photo 4: The suction effect seen <strong>at</strong> feeder <strong>in</strong> <strong>boiler</strong> no 1, where the mix<strong>in</strong>g nozzles were replaced<br />

by a lower diameter thro<strong>at</strong>. The feeder area was now seen to be free of dust.<br />

Photo 5: Suction effect seen <strong>at</strong> feeder discharge chute to mix<strong>in</strong>g nozzles.


Photo 6: The effect of new mix<strong>in</strong>g nozzle <strong>in</strong> <strong>boiler</strong> no 1 could be seen here. The feeder was<br />

oper<strong>at</strong><strong>in</strong>g <strong>at</strong> 1300 mmWC <strong>at</strong> this time.<br />

Photo 7: The feeder was seen to be under positive pressure <strong>in</strong> <strong>boiler</strong> no 2, where two PA fans<br />

were <strong>in</strong> oper<strong>at</strong>ion. With this puff<strong>in</strong>g, the coal dust would choke up the mix<strong>in</strong>g nozzle <strong>in</strong>let chute<br />

due to dust co<strong>at</strong><strong>in</strong>g the <strong>in</strong>let chute. The caked dust could ultim<strong>at</strong>ely fall <strong>in</strong> to the mix<strong>in</strong>g nozzle<br />

stopp<strong>in</strong>g the coal flow.


Photo 8: As per the PA fan performance curve, for the PA flow range of 27000 to 32000 m3/h,<br />

the efficiency of the PA fan should have been above 70%. The efficiency of PA fan was actually<br />

seen to be 30 to 40% only.<br />

Photo 9: The asbestos pad provided above the mix<strong>in</strong>g nozzle was seen to be project<strong>in</strong>g <strong>in</strong> to the<br />

coal p<strong>at</strong>h. Wet coal dust could get a support over this and eventually lead to arch<strong>in</strong>g.


Photo 10: Coal dust seen to build up on the sloped pl<strong>at</strong>e of mix<strong>in</strong>g nozzle <strong>in</strong>let chute. The<br />

co<strong>at</strong><strong>in</strong>g was seen to be quite strong. Incidentally all the old mix<strong>in</strong>g nozzle <strong>in</strong>let chutes were seen<br />

to be like this.<br />

Photo 11: The same chute pl<strong>at</strong>e after clean<strong>in</strong>g is seen here. The dust is seen to have built up on<br />

the weldment of l<strong>in</strong>er pl<strong>at</strong>e.


Photo 12 & 13: The effect of tack / stitch weld was seen very well <strong>in</strong> this chute, which was<br />

dismantled from position <strong>in</strong> <strong>boiler</strong> no2 dur<strong>in</strong>g the visit. The weld beads had acted as nuclei for<br />

dust build up. Ideally the weld should not be present <strong>in</strong> the coal p<strong>at</strong>h.<br />

Photo 14: Mism<strong>at</strong>ch <strong>in</strong> flange sett<strong>in</strong>g is seen here. Such protrusions can act as support for wet<br />

coal dust.


Photo 15: In one of the mix<strong>in</strong>g nozzles, it was found th<strong>at</strong> the coal lump was ly<strong>in</strong>g above thro<strong>at</strong>.<br />

The Coal dust could build up from here.<br />

Photo 16 & 17: The above were snaps from old mix<strong>in</strong>g nozzle <strong>in</strong>let chutes. The coal dust was<br />

seen stick<strong>in</strong>g <strong>in</strong>side the mix<strong>in</strong>g nozzle <strong>in</strong>let chute. This must have occurred more <strong>in</strong> the old<br />

mix<strong>in</strong>g nozzles, as they were always on positive pressure <strong>at</strong> thro<strong>at</strong>.


Photo 18: The draw<strong>in</strong>g of PA fan is seen here. The <strong>in</strong>let box seemed to be small as compared to<br />

fan impeller size. Moreover IGV comes <strong>in</strong> the p<strong>at</strong>h of air flow <strong>at</strong> high velocity zones. The IGV<br />

could block the air flow <strong>in</strong>stead of swirl<strong>in</strong>g it.<br />

700x1800<br />

700x1530<br />

125<br />

400<br />

6<br />

400<br />

355x800<br />

225<br />

158<br />

255<br />

365<br />

350<br />

850<br />

Ø950<br />

1,700<br />

Ø810<br />

Ø1,428.5<br />

175<br />

750<br />

425<br />

350<br />

865.5<br />

400<br />

Figure 1: The PA fan <strong>in</strong>let box was found to be too small <strong>in</strong> comparison with a better<br />

perform<strong>in</strong>g PA fan of almost same design parameters. Small suction box with IGV would work<br />

as sharp ell duct <strong>in</strong>stead of uniformly distribut<strong>in</strong>g suction box.


Figure 2: This is a recommended configur<strong>at</strong>ion of <strong>in</strong>let box by AMCA. The liberally sized<br />

suction box would ensure th<strong>at</strong> the test rack performance is achieved.<br />

Figure 3 & 4: This is an illustr<strong>at</strong>ion of air flow <strong>in</strong>to the eye of impeller with a sharp bend &<br />

without a bend. L<strong>at</strong>er is preferred by the fan manufacturers.


TANJORE PAINTINGS<br />

Tanjore (or Thanjavur or Thanjavoor) pa<strong>in</strong>t<strong>in</strong>gs have a<br />

very rich heritage. This style of pa<strong>in</strong>t<strong>in</strong>g has been followed<br />

widely by the people <strong>in</strong> Southern Tamil Nadu for the past two<br />

centuries. The art flourished <strong>in</strong> Tanjavoor, pronounced<br />

Tanjore, the capital city of the Chola dynasty, and thus got its<br />

name. Mar<strong>at</strong>ha pr<strong>in</strong>ces, Nayaks of Vijaynagar dynasty, Rajus<br />

communities of Tanjore and Trichy and Naidus of Madurai<br />

p<strong>at</strong>ronized the art of Tanjore pa<strong>in</strong>t<strong>in</strong>g from 16 to 18th<br />

centuries. Tanjore pa<strong>in</strong>t<strong>in</strong>gs are deeply rooted <strong>in</strong> tradition and<br />

still <strong>in</strong>nov<strong>at</strong>ive with<strong>in</strong> limits. This art is sacred and dedic<strong>at</strong>ed.<br />

The pa<strong>in</strong>t<strong>in</strong>gs are notable for their adornment <strong>in</strong> the form of semi-precious stones, pearls, glass<br />

pieces and gold. The rich vibrant colors, dashes of gold, semi-precious stones and f<strong>in</strong>e artistic work<br />

are characteristics of these pa<strong>in</strong>t<strong>in</strong>gs. They add beauty and culture to a variety of surround<strong>in</strong>gs and<br />

décor. The pa<strong>in</strong>t<strong>in</strong>gs are mostly of Gods and Goddesses because this art of pa<strong>in</strong>t<strong>in</strong>g flourished <strong>at</strong> a<br />

time when f<strong>in</strong>e-look<strong>in</strong>g and strik<strong>in</strong>g temples were be<strong>in</strong>g constructed by rulers of several dynasties.<br />

The figures <strong>in</strong> these pa<strong>in</strong>t<strong>in</strong>gs are large and the faces are round and div<strong>in</strong>e.<br />

Trac<strong>in</strong>g its roots to the historical golden era of the early 18th century, Tanjore artwork is one of the<br />

many <strong>in</strong>digenous art forms for which India is noted. Orig<strong>in</strong><strong>at</strong><strong>in</strong>g <strong>in</strong> Tanjore about 300 kms from<br />

Chennai ( Madras), which was the then capital of the Gupta empire, this form of art developed <strong>at</strong> the<br />

height of cultural evolvement achieved dur<strong>in</strong>g th<strong>at</strong> period. Crafted with meticulous care the<br />

Thanjavoor (Tanjore) pictures are unique. Wh<strong>at</strong> sets them apart from Indian pa<strong>in</strong>t<strong>in</strong>gs <strong>in</strong> general are<br />

the embellishments made over the basic draw<strong>in</strong>gs with precious and semi-precious stones as well as<br />

the relief work which gives them a three dimensional effect. The pictures are of various sizes,<br />

rang<strong>in</strong>g from huge works spann<strong>in</strong>g whole walls to small m<strong>in</strong>i<strong>at</strong>ures no longer than 6-<strong>in</strong>ch square.<br />

The pa<strong>in</strong>t<strong>in</strong>gs decor<strong>at</strong>e the puja rooms <strong>in</strong> residences, arcades <strong>in</strong> major hotels and lobbies <strong>in</strong> Corpor<strong>at</strong>e<br />

Offices. They also make nice gifts for Diwali, Wedd<strong>in</strong>gs and other special occasions.<br />

Technique<br />

The process of mak<strong>in</strong>g a Tanjore pa<strong>in</strong>t<strong>in</strong>g <strong>in</strong>volves many stages. The first stage <strong>in</strong>volves the mak<strong>in</strong>g<br />

of the prelim<strong>in</strong>ary sketch of the image on the base. The base consists of a cloth pasted over a wooden<br />

base. Then chalk powder or z<strong>in</strong>c oxide is mixed with w<strong>at</strong>er-soluble adhesive and applied on the base.<br />

To make the base smoother, a mild abrasive is sometimes used. After the draw<strong>in</strong>g is made,<br />

decor<strong>at</strong>ion of the jewellery and the apparels <strong>in</strong> the image is done with semi-precious stones also<br />

known as Jaipur stones. Laces or threads are also used to decor<strong>at</strong>e the jewellery. On top of this, the<br />

gold foils are pasted. F<strong>in</strong>ally, dyes are used to add colors to the figures <strong>in</strong> the pa<strong>in</strong>t<strong>in</strong>gs. High-quality<br />

gold foil is used to ensure th<strong>at</strong> the pa<strong>in</strong>t<strong>in</strong>gs last gener<strong>at</strong>ions. They generally appreci<strong>at</strong>e <strong>in</strong> value and<br />

are considered collectibles. Pa<strong>in</strong>t<strong>in</strong>gs come <strong>in</strong> three f<strong>in</strong>ishes, Classic, Antique Style and Embossed.<br />

In the classic f<strong>in</strong>ish, bold colors and strik<strong>in</strong>g backgrounds are comb<strong>in</strong>ed with high-glitter gold foil,<br />

while <strong>in</strong> the antique style, the gold's glitter is more sober, with more subtle colors and pla<strong>in</strong><br />

backgrounds. The embossed pa<strong>in</strong>t<strong>in</strong>gs are similar to the classic style but are embossed to br<strong>in</strong>g about<br />

more depth.<br />

In case you are <strong>in</strong>terested <strong>in</strong> hav<strong>in</strong>g a Tanjore pa<strong>in</strong>t<strong>in</strong>g of your favourite God / Goddess, contact<br />

Mrs.Meena Asokkumar <strong>at</strong> email ID- kasokku@gmail.com , meenaasokkumar@gmail.com.


Transl<strong>at</strong>ed from – Pandit Shriram Sharma Acharya’s work –forwarded by Mr.M.M.R<strong>at</strong>hi-<br />

Shree Cements Ltd<br />

Oh child of God ! be God !<br />

Human powers, abilities are unlimited and are as <strong>in</strong>f<strong>in</strong>ite as the sky. Every human be<strong>in</strong>g is a<br />

symbolic represent<strong>at</strong>ive of the div<strong>in</strong>e consciousness. He possesses with<strong>in</strong> himself all those abilities<br />

th<strong>at</strong> are present <strong>in</strong> his F<strong>at</strong>her - the Almighty.<br />

If the Yog [union] of a soul and the Supreme Soul is made possible; even a meek and most normalseem<strong>in</strong>g<br />

human be<strong>in</strong>g can become the Supreme Be<strong>in</strong>g - God and his gre<strong>at</strong>ness will be equally vast.<br />

Maya is the one, which fabric<strong>at</strong>es the difference between the soul and Supreme Soul, and she is<br />

noth<strong>in</strong>g more than a mere veil of ignorance.<br />

As we are entangled <strong>in</strong> worldly <strong>at</strong>tractions, runn<strong>in</strong>g after fickle wealth and ridiculously greedy<br />

desires it's difficult for us to understand th<strong>at</strong> the unusually rare opportunity of possess<strong>in</strong>g a human<br />

body has been given to us and it must be used for the fulfillment of a specific purpose. Let us just not<br />

worry about the pleasures of the body but also keep <strong>in</strong> m<strong>in</strong>d the contentment of the soul.<br />

If we realize our true n<strong>at</strong>ure, understand our duties and resolve promptly to do as needed, we can<br />

easily get rid of the sense of <strong>in</strong>significance and unrest, which constantly unnerves us.<br />

To break free from this spell of ignorance is the supreme duty of any human be<strong>in</strong>g. The person who<br />

performs this duty faithfully can lay claim to the gre<strong>at</strong>ness of God the Almighty and become God<br />

Himself.<br />

Be Good and Do Good<br />

The truth beh<strong>in</strong>d perform<strong>in</strong>g good deeds to ga<strong>in</strong> entry <strong>in</strong>to heaven may be deb<strong>at</strong>able. There are some<br />

references about such idea <strong>in</strong> the scriptures but its fundamental aim is to motiv<strong>at</strong>e people to follow<br />

the p<strong>at</strong>h <strong>in</strong> life which is moral and good for the self and the society <strong>at</strong> large.Gett<strong>in</strong>g a sick child take<br />

medic<strong>in</strong>e is a gre<strong>at</strong> challenge. A mother has to resort to cajol<strong>in</strong>g the child <strong>in</strong>to tak<strong>in</strong>g medic<strong>in</strong>e by<br />

say<strong>in</strong>g th<strong>at</strong> she would reward him with a toy. The child does not know the worth of the medic<strong>in</strong>e, but<br />

he does know the worth of a toy. In the hope of gett<strong>in</strong>g rewarded with a toy, he takes the medic<strong>in</strong>e<br />

which works <strong>in</strong> his best <strong>in</strong>terest.<br />

Similarly, an average <strong>in</strong>dividual does not appreci<strong>at</strong>e the worth of liv<strong>in</strong>g a high ideal life. Sensual<br />

pleasures are wh<strong>at</strong> <strong>in</strong>terests him more. He can visualize his <strong>in</strong>terest of secur<strong>in</strong>g the heavens which is<br />

the happ<strong>in</strong>ess he is seek<strong>in</strong>g for. The prospects of heaven makes him take up a worthy course <strong>in</strong> life.<br />

This can’t be thought of as a deceit or a lie as it would <strong>in</strong>deed usher him <strong>in</strong> the direction which has<br />

much more to offer than the said reward.<br />

Why society?<br />

The ma<strong>in</strong> difference between man and animal is th<strong>at</strong> man establishes and lives <strong>in</strong> a society and<br />

progresses together through cooper<strong>at</strong>ion and mutual support whereas animals mostly live isol<strong>at</strong>ed<br />

self-conta<strong>in</strong>ed lives. Animals fulfill their own needs one way or another by themselves or live <strong>in</strong><br />

groups and jo<strong>in</strong>tly defend themselves aga<strong>in</strong>st pred<strong>at</strong>ors. This, however, this isn’t good enough to be


tagged as liv<strong>in</strong>g <strong>in</strong> a society. On the other hand, it is man’s second n<strong>at</strong>ure to live <strong>in</strong> society or have a<br />

community spirit. It is absolutely <strong>in</strong>herent <strong>in</strong> his n<strong>at</strong>ure or his <strong>in</strong>n<strong>at</strong>e <strong>in</strong>st<strong>in</strong>ct.<br />

The offspr<strong>in</strong>g of birds and animals become self-reliable very quickly after their birth and therefore,<br />

they forget their <strong>in</strong>tim<strong>at</strong>e connection (blood rel<strong>at</strong>ion) with their parents. This may one of the<br />

underly<strong>in</strong>g factors responsible for the lack of last<strong>in</strong>g mutual lov<strong>in</strong>g and car<strong>in</strong>g feel<strong>in</strong>gs amongst<br />

them. On the other hand, human be<strong>in</strong>gs rema<strong>in</strong> dependent on their parents or guardians for very long<br />

after birth which may be one of the ma<strong>in</strong> reason for their last<strong>in</strong>g mutual bond.If we ponder a bit more<br />

deeply on this subject, we will understand th<strong>at</strong> the dependence of offspr<strong>in</strong>g on their parents or<br />

guardians do not end when they become adults but keep exist<strong>in</strong>g as have to rely on the society <strong>in</strong><br />

countless areas <strong>in</strong> life.<br />

Be Good and Do Good<br />

The truth beh<strong>in</strong>d perform<strong>in</strong>g good deeds to ga<strong>in</strong> entry <strong>in</strong>to heaven may be deb<strong>at</strong>able. There are some<br />

references about such idea <strong>in</strong> the scriptures but its fundamental aim is to motiv<strong>at</strong>e people to follow<br />

the p<strong>at</strong>h <strong>in</strong> life which is moral and good for the self and the society <strong>at</strong> large.Gett<strong>in</strong>g a sick child take<br />

medic<strong>in</strong>e is a gre<strong>at</strong> challenge. A mother has to resort to cajol<strong>in</strong>g the child <strong>in</strong>to tak<strong>in</strong>g medic<strong>in</strong>e by<br />

say<strong>in</strong>g th<strong>at</strong> she would reward him with a toy. The child does not know the worth of the medic<strong>in</strong>e, but<br />

he does know the worth of a toy. In the hope of gett<strong>in</strong>g rewarded with a toy, he takes the medic<strong>in</strong>e<br />

which works <strong>in</strong> his best <strong>in</strong>terest.<br />

Similarly, an average <strong>in</strong>dividual does not appreci<strong>at</strong>e the worth of liv<strong>in</strong>g a high ideal life. Sensual<br />

pleasures are wh<strong>at</strong> <strong>in</strong>terests him more. He can visualize his <strong>in</strong>terest of secur<strong>in</strong>g the heavens which is<br />

the happ<strong>in</strong>ess he is seek<strong>in</strong>g for. The prospects of heaven makes him take up a worthy course <strong>in</strong> life.<br />

This can’t be thought of as a deceit or a lie as it would <strong>in</strong>deed usher him <strong>in</strong> the direction which has<br />

much more to offer than the said reward.<br />

Just make not break too<br />

Secret to good garden<strong>in</strong>g lies not only <strong>in</strong> nourish<strong>in</strong>g the plants but also <strong>in</strong> prun<strong>in</strong>g the weeds. Plants<br />

need to be cared after, given nourishments, yes but the weeds need to be trimmed too. Only then the<br />

dream of a beautiful garden can be realized.<br />

In much the same way, secret of self-progress lies <strong>in</strong> not only constructive activities like read<strong>in</strong>g,<br />

contempl<strong>at</strong>ion, pious company, religious observances but also <strong>in</strong> perform<strong>in</strong>g corrective actions<br />

necessary for self reform. For the eradic<strong>at</strong>ion of neg<strong>at</strong>ive impr<strong>in</strong>ts and <strong>in</strong>ferior traits we need to<br />

undergo the arduous penance of <strong>in</strong>trospection and self-reform.<br />

For progress and reform it is necessary to adopt a balanced approach th<strong>at</strong> does justice to both aspects<br />

of the process. It was the vile side effect, of our extremist, <strong>in</strong>appropri<strong>at</strong>ely lax and one-sided<br />

religiousness th<strong>at</strong> India had to suffer the curse of long political enslavement, which lasted for a<br />

thousand years.<br />

Yes we must foster th<strong>at</strong> which is good and noble, but the eradic<strong>at</strong>ion of wh<strong>at</strong> is bad and vile is our<br />

pious duty too. Only if we fully understand and appreci<strong>at</strong>e this eternal truth, can each one of us<br />

uphold justice and strike down <strong>in</strong>justice like it was done <strong>in</strong> the days of yore.


LOVELY ARTICLE SHARED -------<br />

IN A RELATIONSHIP, MARRIED OR NOT... YOU SHOULD READ THIS!<br />

by Kimmies Floral<br />

When I got home th<strong>at</strong> night as my wife served d<strong>in</strong>ner, I held her hand<br />

and said, I've got someth<strong>in</strong>g to tell you. She s<strong>at</strong> down and <strong>at</strong>e quietly.<br />

Aga<strong>in</strong> I observed the hurt <strong>in</strong> her eyes. Suddenly I didn't know how to<br />

open my mouth. But I had to let her know wh<strong>at</strong> I was th<strong>in</strong>k<strong>in</strong>g. I want<br />

a divorce. I raised the topic calmly.<br />

She didn't seem to be annoyed by my words, <strong>in</strong>stead she asked me<br />

softly, why?<br />

I avoided her question. This made her angry. She threw away the<br />

chopsticks and shouted <strong>at</strong> me, you are not a man! Th<strong>at</strong> night, we didn't<br />

talk to each other. She was weep<strong>in</strong>g. I knew she wanted to f<strong>in</strong>d out wh<strong>at</strong> had happened to our<br />

marriage. But I could hardly give her a s<strong>at</strong>isfactory answer; she had lost my heart to Jane. I didn't<br />

love her anymore. I just pitied her!<br />

With a deep sense of guilt, I drafted a divorce agreement which st<strong>at</strong>ed th<strong>at</strong> she could own our house,<br />

our car, and 30% stake of my company.<br />

She glanced <strong>at</strong> it and then tore it <strong>in</strong>to pieces. The woman who had spent ten years of her life with me<br />

had become a stranger. I felt sorry for her wasted time, resources and energy but I could not take<br />

back wh<strong>at</strong> I had said for I loved Jane so dearly. F<strong>in</strong>ally she cried loudly <strong>in</strong> front of me, which was<br />

wh<strong>at</strong> I had expected to see. To me her cry was actually a k<strong>in</strong>d of release. The idea of divorce which<br />

had obsessed me for several weeks seemed to be firmer and clearer now.<br />

The next day, I came back home very l<strong>at</strong>e and found her writ<strong>in</strong>g someth<strong>in</strong>g <strong>at</strong> the table. I didn't have<br />

supper but went straight to sleep and fell asleep very fast because I was tired after an eventful day<br />

with Jane.<br />

When I woke up, she was still there <strong>at</strong> the table writ<strong>in</strong>g. I just did not care so I turned over and was<br />

asleep aga<strong>in</strong>.<br />

In the morn<strong>in</strong>g she presented her divorce conditions: she didn't want anyth<strong>in</strong>g from me, but needed a<br />

month's notice before the divorce. She requested th<strong>at</strong> <strong>in</strong> th<strong>at</strong> one month we both struggle to live as<br />

normal a life as possible. Her reasons were simple: our son had his exams <strong>in</strong> a month's time and she<br />

didn't want to disrupt him with our broken marriage.<br />

This was agreeable to me. But she had someth<strong>in</strong>g more, she asked me to recall how I had carried her<br />

<strong>in</strong>to out bridal room on our wedd<strong>in</strong>g day.<br />

She requested th<strong>at</strong> every day for the month's dur<strong>at</strong>ion I carry her out of our bedroom to the front door<br />

ever morn<strong>in</strong>g. I thought she was go<strong>in</strong>g crazy. Just to make our last days together bearable I accepted<br />

her odd request.


I told Jane about my wife's divorce conditions. . She laughed loudly and thought it was absurd. No<br />

m<strong>at</strong>ter wh<strong>at</strong> tricks she applies, she has to face the divorce, she said scornfully.<br />

My wife and I hadn't had any body contact s<strong>in</strong>ce my divorce <strong>in</strong>tention was explicitly expressed. So<br />

when I carried her out on the first day, we both appeared clumsy. Our son clapped beh<strong>in</strong>d us, daddy<br />

is hold<strong>in</strong>g mommy <strong>in</strong> his arms. His words brought me a sense of pa<strong>in</strong>. From the bedroom to the<br />

sitt<strong>in</strong>g room, then to the door, I walked over ten meters with her <strong>in</strong> my arms. She closed her eyes and<br />

said softly; don't tell our son about the divorce. I nodded, feel<strong>in</strong>g somewh<strong>at</strong> upset. I put her down<br />

outside the door. She went to wait for the bus to work. I drove alone to the office.<br />

On the second day, both of us acted much more easily. She leaned on my chest. I could smell the<br />

fragrance of her blouse. I realized th<strong>at</strong> I hadn't looked <strong>at</strong> this woman carefully for a long time. I<br />

realized she was not young any more. There were f<strong>in</strong>e wr<strong>in</strong>kles on her face, her hair was grey<strong>in</strong>g!<br />

Our marriage had taken its toll on her. For a m<strong>in</strong>ute I wondered wh<strong>at</strong> I had done to her.<br />

On the fourth day, when I lifted her up, I felt a sense of <strong>in</strong>timacy return<strong>in</strong>g. This was the woman who<br />

had given ten years of her life to me.<br />

On the fifth and sixth day, I realized th<strong>at</strong> our sense of <strong>in</strong>timacy was grow<strong>in</strong>g aga<strong>in</strong>. I didn't tell Jane<br />

about this. It became easier to carry her as the month slipped by. Perhaps the everyday workout made<br />

me stronger. She was choos<strong>in</strong>g wh<strong>at</strong> to wear one morn<strong>in</strong>g. She tried on quite a few dresses but could<br />

not f<strong>in</strong>d a suitable one. Then she sighed, all my dresses have grown bigger. I suddenly realized th<strong>at</strong><br />

she had grown so th<strong>in</strong>, th<strong>at</strong> was the reason why I could carry her more easily.<br />

Suddenly it hit me... she had buried so much pa<strong>in</strong> and bitterness <strong>in</strong> her heart. Subconsciously I<br />

reached out and touched her head.<br />

Our son came <strong>in</strong> <strong>at</strong> the moment and said, Dad, it's time to carry mom out. To him, see<strong>in</strong>g his f<strong>at</strong>her<br />

carry<strong>in</strong>g his mother out had become an essential part of his life. My wife gestured to our son to come<br />

closer and hugged him tightly. I turned my face away because I was afraid I might change my m<strong>in</strong>d<br />

<strong>at</strong> this last m<strong>in</strong>ute. I then held her <strong>in</strong> my arms, walk<strong>in</strong>g from the bedroom, through the sitt<strong>in</strong>g room,<br />

to the hallway. Her hand surrounded my neck softly and n<strong>at</strong>urally. I held her body tightly; it was just<br />

like our wedd<strong>in</strong>g day.<br />

But her much lighter weight made me sad. On the last day, when I held her <strong>in</strong> my arms I could<br />

hardly move a step. Our son had gone to school. I held her tightly and said, I hadn't noticed th<strong>at</strong> our<br />

life lacked <strong>in</strong>timacy.<br />

I drove to office.... jumped out of the car swiftly without lock<strong>in</strong>g the door. I was afraid any delay<br />

would make me change my m<strong>in</strong>d...I walked upstairs. Jane opened the door and I said to her, Sorry,<br />

Jane, I do not want the divorce anymore.<br />

She looked <strong>at</strong> me, astonished, and then touched my forehead. Do you have a fever? She said. I<br />

moved her hand off my head. Sorry, Jane, I said, I won't divorce. My marriage life was bor<strong>in</strong>g<br />

probably because she and I didn't value the details of our lives, not because we didn't love each other<br />

anymore. Now I realize th<strong>at</strong> s<strong>in</strong>ce I carried her <strong>in</strong>to my home on our wedd<strong>in</strong>g day I am supposed to<br />

hold her until de<strong>at</strong>h do us apart.


Jane seemed to suddenly wake up. She gave me a loud slap and then slammed the door and burst <strong>in</strong>to<br />

tears. I walked downstairs and drove away.<br />

At the floral shop on the way, I ordered a bouquet of flowers for my wife. The salesgirl asked me<br />

wh<strong>at</strong> to write on the card. I smiled and wrote, I'll carry you out every morn<strong>in</strong>g until de<strong>at</strong>h do us apart.<br />

Th<strong>at</strong> even<strong>in</strong>g I arrived home, flowers <strong>in</strong> my hands, a smile on my face, I run up stairs, only to f<strong>in</strong>d<br />

my wife <strong>in</strong> the bed - dead.<br />

My wife had been fight<strong>in</strong>g CANCER for months and I was so busy with Jane to even notice. She<br />

knew th<strong>at</strong> she would die soon and she wanted to save me from the wh<strong>at</strong>ever neg<strong>at</strong>ive reaction from<br />

our son, <strong>in</strong> case we push thru with the divorce.-- At least, <strong>in</strong> the eyes of our son--- I'm a lov<strong>in</strong>g<br />

husband....<br />

The small details of your lives are wh<strong>at</strong> really m<strong>at</strong>ter <strong>in</strong> a rel<strong>at</strong>ionship. It is not the mansion, the car,<br />

property, the money <strong>in</strong> the bank. These cre<strong>at</strong>e an environment conducive for happ<strong>in</strong>ess but cannot<br />

give happ<strong>in</strong>ess <strong>in</strong> themselves. So f<strong>in</strong>d time to be your spouse's friend and do those little th<strong>in</strong>gs for<br />

each other th<strong>at</strong> build <strong>in</strong>timacy. Do have a real happy marriage!<br />

If you don't share this, noth<strong>in</strong>g will happen to you.<br />

If you do, you just might save a marriage.<br />

Many of life's failures are people who did not realize how close they were to success when they gave<br />

up.


SIR CHANDRASEKHARA VENKATA RAMAN, FRS<br />

(7 NOVEMBER 1888 – 21 NOVEMBER 1970)<br />

He was an Indian physicist whose work was <strong>in</strong>fluential <strong>in</strong> the<br />

growth of science <strong>in</strong> the world. He was the recipient of the Nobel<br />

Prize for Physics <strong>in</strong> 1930 for the discovery th<strong>at</strong> when light traverses<br />

a transparent m<strong>at</strong>erial, some of the light th<strong>at</strong> is deflected changes <strong>in</strong><br />

wavelength. This phenomenon is now called Raman sc<strong>at</strong>ter<strong>in</strong>g and<br />

is the result of the Raman effect.<br />

On February 28, 1928, through his experiments on the sc<strong>at</strong>ter<strong>in</strong>g of<br />

light, he discovered the Raman effect. It was <strong>in</strong>stantly clear th<strong>at</strong> this<br />

discovery was an important one. It gave further proof of the<br />

quantum n<strong>at</strong>ure of light. Raman spectroscopy came to be based on<br />

this phenomenon, and Ernest Rutherford referred to it <strong>in</strong> his<br />

presidential address to the Royal Society <strong>in</strong> 1929. Raman was<br />

president of the 16th session of the Indian Science Congress <strong>in</strong><br />

1929. He was conferred a knighthood, and medals and honorary doctor<strong>at</strong>es by various universities.<br />

Raman was confident of w<strong>in</strong>n<strong>in</strong>g the Nobel Prize <strong>in</strong> Physics as well, and was disappo<strong>in</strong>ted when the<br />

Nobel Prize went to Richardson <strong>in</strong> 1928 and to de Broglie <strong>in</strong> 1929. He was so confident of w<strong>in</strong>n<strong>in</strong>g<br />

the prize <strong>in</strong> 1930 th<strong>at</strong> he booked tickets <strong>in</strong> July, even though the awards were to be announced <strong>in</strong><br />

November, and would scan each day's newspaper for announcement of the prize, toss<strong>in</strong>g it away if it<br />

did not carry the news. He did eventually w<strong>in</strong> the 1930 Nobel Prize <strong>in</strong> Physics "for his work on the<br />

sc<strong>at</strong>ter<strong>in</strong>g of light and for the discovery of the effect named after him. He was the first Asian and first<br />

non-White to receive any Nobel Prize <strong>in</strong> the sciences. Before him Rab<strong>in</strong>dran<strong>at</strong>h Tagore (also Indian)<br />

had received the Nobel Prize for Liter<strong>at</strong>ure.<br />

C.V Raman & Bhagavantam, discovered the quantum photon sp<strong>in</strong> <strong>in</strong> 1932, which further confirmed<br />

the quantum n<strong>at</strong>ure of light.<br />

Raman also worked on the acoustics of musical <strong>in</strong>struments. He worked out the theory of transverse<br />

vibr<strong>at</strong>ion of bowed str<strong>in</strong>gs, on the basis of superposition velocities. He was also the first to<br />

<strong>in</strong>vestig<strong>at</strong>e the harmonic n<strong>at</strong>ure of the sound of the Indian drums such as the tabla and the<br />

mridangam.<br />

Raman and his student Nagendran<strong>at</strong>h, provided the correct theoretical explan<strong>at</strong>ion for the acoustooptic<br />

effect (light sc<strong>at</strong>ter<strong>in</strong>g by sound waves), <strong>in</strong> a series of articles result<strong>in</strong>g <strong>in</strong> the celebr<strong>at</strong>ed<br />

Raman-N<strong>at</strong>h theory. Modul<strong>at</strong>ors, and switch<strong>in</strong>g systems based on this effect have enabled optical<br />

communic<strong>at</strong>ion components based on laser systems. lo<br />

In 1934, Raman became the director of the Indian Institute of Science <strong>in</strong> Bangalore, where two years<br />

l<strong>at</strong>er he cont<strong>in</strong>ued as a professor of physics. Other <strong>in</strong>vestig<strong>at</strong>ions carried out by Raman were<br />

experimental and theoretical studies on the diffraction of light by acoustic waves of ultrasonic and<br />

hypersonic frequencies (published 1934-1942), and those on the effects produced by X-rays on<br />

<strong>in</strong>frared vibr<strong>at</strong>ions <strong>in</strong> crystals exposed to ord<strong>in</strong>ary light.

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