4"12-Z 1 - part - usaid

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furnace is dIvided into two by a vertIcal tube screen In the mIddle of the furnace. The screen
is perpendicular to the axis of the drum and its role IS to Increase the surface absorbing the heat
radiation of the flame. In the upper section of the furnace above the nose are radiant pendant
superheaters. In the honzontal passes are reheaters and first stage superheaters and In the
vertical passes are reheater regulator stages and economIzer. Two LJungstrom type regenerative
air heaters are supplied for air heahng purposes on umts 2, 3, 6 and 7. All other boilers have
pIpe au heaters. The boiler operates on a balanced draft prinCIple WIth aIr being supphed by
2 off 50% duty centrifugal type forced draft fans and 2 off 50% duty induced draft fans.
3.3 Coal Handlin&
Coal is supplied to the stahon from more than 30 supplIers. The coal can go either of two ways'
from railroad duect to the coal storage or from raIlroad dIrect to stahon's two conveyors (one
plus one reserve). There IS a speCIal scale in the railroad track to weIgh as-receIved coal to
+.5 % accuracy. MechanIcal coal samples are taken from the two conveyors and collected every
5 minutes and mixed for 24 hours and analyzed. Coal IS then collected for 5 days, mIxed and
a more detailed analySIS completed.
3.4 Mazut Supply
The present level instruments located near the bottom of tanks Indicate level based on heIght and
weight of liquid. The readings are not very accurate due to vanations of denSIty of mazut and
water content and pluggmg of the tank nozzles with crud. A high prionty IS placed on getting
better level Instruments on four maIn mazut storage tanks to measure delivenes and consumptIOn
of mazut. The amount of mazut used for the total power statIOn IS determmed by measunng the
level of the mazut storage tanks per shift.
3.5 Gas Supply
The power station umts are supplemented by natural gas when It can be purchased. Natural gas
flow meters already exist per boiler and work well.
• 3.6 Boiler Efficiency Calculations
The methodology for the boiler efficiency calculatIOn is SImIlar to Zmiev, Uglegorsk,
Khourakhuvska, Knvoi Rog and other power plants m Ukraiman Power System The
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calculatIOns are done on a per umt baSIS. The only fuel measured dIrectly per bOIler is the
natural gas. All other fuel quantItIes per bOIler are extrapolated from power statIOn data. The
qUalIty of the coal IS also averaged on a 5 day baSIS. These effiCIencIes are compared to the
efficienCIes calculated based upon the boIler deSIgn performance.
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• 5906-01f02AIBURSHTYNf5/17/95
3.7 Process Control System
BOIlers of the Burshtyn power plant operate m a steady-state mode (base load) with a turbme
maintaining throttle pressure, "fixed" firing rate, floating frequency and manually adjusted aIr
flow (fixed sethngs for leach load). There are four O 2 analyzers per umt WhIch are used to
monitor furnace 02' These analyzers are used by operators to remotely adjust speed of coal
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