4"12-Z 1 - part - usaid

CONDENSER COOLING WATER
Condenser cooling water is taken from an artificial lake which was created by damming a
river at the same time the plant was constructed. The lake is used as a fish farm. and
chemicals cannot be used to maintain condenser cleanliness. Therefore, condenser fouling
with CaC0 3 , MgC0 3 and organics is a significant problem.
Each condenser is cleaned twice per year and the average deposit thickness at the time of a
cleaning is 3-4 mm. At the time of a condenser cleaning, there is a loss of condenser
vacuum from 0.036 kgIcm 2 to 0.039 kg/cm 2 absolute pressure which causes as MW loss in
generator output. Two condensers have Ukrainian design ball cleaning systems which were
installed in 1990.
BOILER MAKEUP WATER AND CITY WATER TREATMENT
Lake water makeup is heated and sent to four (4) 150 TIH clarifiers and six (6) 3.0 meter
diameter anthracite filters. From that point, water is sent to the city hot water district
heating system softeners and to the boiler makeup water demineralizer. City water demand
is 300 T/H and boiler makeup water demand is 240 TIH, and these two flows should be
within the design rating of the equipment. However, the ion exchange material in the
demineralizer is in such poor condition that lOOTIH are consumed in regenerating it. Also,
the clarifiers are overloaded, suspended solids are overflowing, and large quantities of water
are needed to backwash the filters.
As a result of these conditions, the plant can meet a demand of 240 TIH for boiler
feedwater, but can only supply 200 TIH to the city. The quality of city water is also not
good due to high bacteria count. Another result of these conditions is high consumption of
sulfuric acid and caustic soda for demineralizer regenerations.
DISTRICT HEATING
Steam is extracted from each turbine IP Cylinder to supply the district hot water heatmg of
the nearby city and greenhouses.
REHABILITATION PLANS
IMPRESSARIO AGRUPADOS, an engineering consulting firm from Spain, conducted a
major rehabilitation study in 1993 for EBRD. They evaluated seven alternatives for
rehabilitation, including rebuilding boilers and replacing turbines with upgraded 225 MW
machines, adding scrubbers, precipitators, replacing boilers with circulating fluidized bed
(CFB) boilers, and gas turbine combined cycle repowering.
The station is very interested in learning more about CFB technology as a solution to the
problems resulting from poor coal - S02' NO x , and high maintenance on the old Taganrog
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