cold milk skimming separator
cold milk skimming separator
cold milk skimming separator
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Separatorion of Milk<br />
Hot vs. Cold
Separator principes<br />
warm <strong>milk</strong> <strong>separator</strong><br />
MSE 500-01-777<br />
standard design<br />
<strong>cold</strong> <strong>milk</strong> <strong>separator</strong><br />
MSE 500-48-777<br />
hermetic design<br />
GEA Mechanical Equipment / GEA Westfalia Separator
Comparison Cold Milk and Hot Milk Skimming<br />
hot <strong>milk</strong> <strong>skimming</strong> <strong>separator</strong><br />
feed from above<br />
discharge via double<br />
centripetal pump (static)<br />
hydrohermetic sealing<br />
<strong>cold</strong> <strong>milk</strong> <strong>skimming</strong> <strong>separator</strong><br />
<strong>cold</strong> <strong>milk</strong> <strong>skimming</strong> <strong>separator</strong><br />
feed from below<br />
discharge via double<br />
pumping wheel (rotating)<br />
mechanical seals<br />
GEA Mechanical Equipment / GEA Westfalia Separator
Hot Skimming Bowl<br />
centripetal pump for skim<br />
centripetal pump for cream<br />
rising channel<br />
feed tube<br />
separating disk<br />
distributor<br />
bowl top<br />
disk stack<br />
distributor<br />
channel<br />
sediment<br />
holding<br />
space<br />
ejection port<br />
sliding<br />
piston<br />
bowl<br />
bottom<br />
GEA Mechanical Equipment / GEA Westfalia Separator
Flow in Hot Skimming Bowl<br />
whole <strong>milk</strong><br />
cream<br />
skim <strong>milk</strong><br />
solids<br />
GEA Mechanical Equipment / GEA Westfalia Separator
Hermetic Skimming Bowl<br />
cream pump<br />
skim pump<br />
rising channel<br />
separating disk<br />
bowl top<br />
disk stack<br />
distributor<br />
channel<br />
sediment<br />
holding<br />
space<br />
distributor<br />
ejection port<br />
feed bore in spindle<br />
sliding<br />
piston<br />
bowl<br />
bottom<br />
GEA Mechanical Equipment / GEA Westfalia Separator
Flow in Hermetic Skimming Bowl<br />
whole <strong>milk</strong><br />
cream<br />
skim <strong>milk</strong><br />
solids<br />
GEA Mechanical Equipment / GEA Westfalia Separator
Cold Milk Skimming<br />
Usually <strong>milk</strong> is skimmed during pasteurisation at 50°C – 55°C.<br />
However in some cases it is done at low temperatures:<br />
For the production<br />
no pasteurisation is<br />
is necessary<br />
of raw <strong>milk</strong> type cheeses<br />
allowed, so <strong>cold</strong> <strong>milk</strong> <strong>skimming</strong><br />
to standardise the fat content<br />
For the production of high quality products – i.e.<br />
low heat <strong>milk</strong> powder - <strong>cold</strong> <strong>milk</strong> <strong>skimming</strong> is applied<br />
to avoid double heating<br />
A significant energy saving will be achieved if a double heating<br />
is avoided.<br />
The main markets for <strong>cold</strong> <strong>milk</strong> <strong>skimming</strong> are Australia, New Zealand,<br />
Mexico and USA.<br />
Mostly temperatures are between 4°C and 8°C, but in general terms<br />
anything below 20°C is regarded as <strong>cold</strong> <strong>milk</strong> separation.<br />
GEA Mechanical Equipment / GEA Westfalia Separator
Cold Milk Skimming<br />
Cold <strong>milk</strong> <strong>skimming</strong> differs from hot <strong>milk</strong> separation in a number of ways.<br />
The <strong>milk</strong> viscosity is<br />
separation velocity of<br />
higher at low temperatures, so the<br />
the fat globules is reduced.<br />
The cream viscosity<br />
is much higher at these low temperatures,<br />
this imposes the risk of internal blockage of the bowl.<br />
Therefore the maximum cream fat is limited to 42%.<br />
Cold <strong>milk</strong> <strong>skimming</strong> <strong>separator</strong>s are designed as<br />
semi-hermetic<br />
or hermetic machines, the supply from below allows<br />
a central cream discharge with big cross sections.<br />
Cold <strong>milk</strong> <strong>skimming</strong> has a higher demand of clarifying surface, equivalent<br />
machines handle smaller capacities than for hot <strong>milk</strong> <strong>skimming</strong>.<br />
The <strong>skimming</strong> efficiency is very dependent on temperature and capacity,<br />
values of 0,1% to 0,4% are realistic.<br />
Most of the <strong>milk</strong> fat fractions are crystallised at low temperatures, so the fat<br />
globules are much more fragile and sensitive to shearing stress.<br />
GEA Mechanical Equipment / GEA Westfalia Separator
Reasons for <strong>cold</strong> separation<br />
10<br />
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GEA Mechanical Equipment / GEA Westfalia Separator
Cold Milk Skimming Plant with Preheater<br />
GEA Mechanical Equipment / GEA Westfalia Separator
Cold Milk Skimming Separator Characteristics<br />
skim fat<br />
1,3 %<br />
1,2 %<br />
5°C<br />
1,1 %<br />
1,0 %<br />
0,9 %<br />
10°C<br />
0,8 %<br />
0,7 %<br />
15°C<br />
0,6 %<br />
0,5 %<br />
20°C<br />
0,4 %<br />
0,3 %<br />
0,2 %<br />
0,1 %<br />
0,0 %<br />
0 l/h l/h<br />
feed rate<br />
5.000 5.000 l/h l/h<br />
10.000 10.000 l/h l/h<br />
15.000 15.000 l/h l/h<br />
20.000 20.000 l/h l/h<br />
25.000 25.000 l/h l/h<br />
30.000 30.000 l/h l/h<br />
35.000 35.000 l/h l/h<br />
40.000 40.000 l/h l/h<br />
45.000 45.000 l/h l/h<br />
50.000 50.000 l/h l/h<br />
MSE 140-48<br />
48-177<br />
MSE 500-48<br />
48-777<br />
GEA Mechanical Equipment / GEA Westfalia Separator
Evolution of Feed Systems<br />
1968 1978 2008<br />
Rib Distributor System<br />
Soft Stream System<br />
Hydro Soft System<br />
Milk<br />
<strong>separator</strong>s<br />
Hermetic System<br />
Cold<strong>milk</strong><br />
<strong>separator</strong>s<br />
GEA Mechanical Equipment / GEA Westfalia Separator
Efficiency of Feed Systems<br />
1968 1978 2008<br />
warm <strong>milk</strong><br />
<strong>separator</strong>s<br />
Rib Distributor<br />
SAMM / MSA- types<br />
- risc of shearing<br />
+ flexible capacity<br />
+ low feed pressure<br />
Soft Stream System<br />
MSD- types<br />
+ no shearing<br />
- Limited capacity<br />
+ low feed pressure<br />
Hydro Soft System<br />
MSE- types<br />
+ no shearing<br />
+ flexible capacity<br />
+ low feed pressure<br />
<strong>cold</strong> <strong>milk</strong><br />
<strong>separator</strong>s<br />
Hermetic System<br />
MSA / MSE- types<br />
+ no shearing<br />
+ flexible capacity<br />
- high feed pressure<br />
GEA Mechanical Equipment / GEA Westfalia Separator
Cream Concentration<br />
Relation of <strong>skimming</strong> efficiency and cream concentration<br />
Cream<br />
concentration<br />
up to 45 %<br />
Cream<br />
concentration<br />
> 45 %<br />
GEA Mechanical Equipment / GEA Westfalia Separator
Feed systems<br />
16<br />
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GEA Mechanical Equipment / GEA Westfalia Separator
Hermetic Seals<br />
17<br />
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GEA Mechanical Equipment / GEA Westfalia Separator
Function of Centripetal Pumps<br />
Principle<br />
GEA Mechanical Equipment / GEA Westfalia Separator
GEA Westfalia Separator hydrosoft<br />
No mechanical seal<br />
necessary between static<br />
inlet pipe and rotating<br />
distributor. No cooling<br />
water required.<br />
The end of the inlet<br />
pipe is continuous<br />
below the liquid<br />
surface, that is why<br />
there is no air intake.<br />
There are no<br />
cross braces, that<br />
is why there is no<br />
shearing.<br />
The plate which is near<br />
to the outer wall, keeps<br />
the liquid in the room<br />
under the inlet pipe.<br />
1<br />
BL Dairy Technology<br />
GEA Mechanical Equipment / GEA Westfalia Separator
GEA Westfalia Separator hydrosoft<br />
There are 12 holes for<br />
the liquid to feed the<br />
disc stack:<br />
•even distribution<br />
•directed flow, no<br />
turbulences<br />
•low flow speed<br />
The system<br />
enables to<br />
handle different<br />
flow rates, it is<br />
not limited by<br />
the construction<br />
Because of the<br />
low flow rate,<br />
there is low<br />
shearing and<br />
low pressure<br />
Low feed<br />
pressure,<br />
because there<br />
is a suction<br />
effect<br />
2<br />
BL Dairy Technology<br />
GEA Mechanical Equipment / GEA Westfalia Separator
GEA Westfalia Separator hydrosoft<br />
Features and advantages leading to customer benefits!<br />
•without mechanical seal<br />
• no cooling water required<br />
reduced maintenance cost<br />
savings in operational costs<br />
•no shearing, no air intake premium product quality<br />
•flexible capacity<br />
easy process implementation<br />
•low feed pressure < 1 bar no extra booster pump required<br />
savings in energy<br />
savings in installation and<br />
maintenance<br />
2<br />
BL Dairy Technology<br />
GEA Mechanical Equipment / GEA Westfalia Separator
Electrical Power Consumption<br />
<strong>milk</strong> pasteurizing<br />
line with<br />
standard <strong>separator</strong><br />
(warm <strong>milk</strong>)<br />
GEA Mechanical Equipment / GEA Westfalia Separator
Electrical Power Consumption<br />
<strong>milk</strong> pasteurizing<br />
line with<br />
hermetic <strong>separator</strong><br />
(<strong>cold</strong> <strong>milk</strong>)<br />
GEA Mechanical Equipment / GEA Westfalia Separator
Milk Pasteuriser<br />
typical installation:<br />
<strong>skimming</strong> <strong>separator</strong> in a <strong>milk</strong> pasteuriser, upstream<br />
TIRA<br />
SKIM MILK<br />
MILK<br />
TIC<br />
FIC<br />
CREAM<br />
F<br />
P<br />
GEA Mechanical Equipment / GEA Westfalia Separator
Electrical Power Consumption Savings (i.e. UHT<br />
Milk and <strong>cold</strong> separation)<br />
<strong>milk</strong> pasteurizing<br />
line with<br />
standard <strong>separator</strong><br />
(warm <strong>milk</strong>)<br />
GEA Mechanical Equipment / GEA Westfalia Separator
Electrical Power Consumption Savings UHT Milk<br />
approx. 15 - 20m³/h<br />
Heating from<br />
5-72-5°C<br />
Item: Dimension in € approx. Amount/h Amount /a<br />
Electrical Energy: 25 - 25 kW/h 0,09 ct/kwh 2,25 15750<br />
Steam: 200 kg/h 23,50 €/t 4,7 33000<br />
Water: 25 m³/h 1,5 €/m³ 37,5 262000***<br />
press. Air: 10 m³/h 0,015€/m³ 0,15 1050<br />
GEA Mechanical Equipment / GEA Westfalia Separator
Some like it <strong>cold</strong>!<br />
Capacity<br />
Skimming efficiency<br />
Microbiology<br />
Operating life<br />
Gentle product treatment<br />
Logistics / flexibility<br />
Energy consumption<br />
Service friendliness<br />
Warm Milk<br />
Cold Milk<br />
+ -<br />
+ -<br />
- +<br />
+ +<br />
- +<br />
+ +<br />
- +<br />
+ -<br />
GEA Mechanical Equipment / GEA Westfalia Separator