OCTOBER 19-20, 2012 - YMCA University of Science & Technology

Input of Station
= Energy sent out (KW) .
Fuel burnt (Kg) x Calorific value of fuel (K Cal/kg)
Proceedings of the National Conference on
Trends and Advances in Mechanical Engineering,
YMCA University of Science & Technology, Faridabad, Haryana, Oct 19-20, 2012
Fuel burnt (Coal) = 120 T/ Hr
= 33.33 Kg/Sec
C.V
= 4860 K Cal/kg
= 4860 x 4.2
= 20412 KW
Heat Input =20412 x 33.33/10 = 680.33 MW
Overall Efficiency of Plant= 250 x 100/680.33
= 36.74 %
Data Analysis for Table No.-1 (250 MW)
Sr. No. 01 Pressure =150 Kg/cm²
Temperature =540 ºC
= 813 K
Flow
=782 T/Hr.
=782 x 1000/3600
=217.22 Kg/sec
Enthalpy (CpxT) =4.2 x 813
=3414.6 KJ/Kg
Energy =217.22 x 3414.6/1000
=741.73 MW
4. MAIN RESULTS
The efficiencies / effectiveness of typical 250 MW Plant at different loads are compared as follows:-
Description
Table 1
250
MW
232
MW
220
MW
Boiler Efficiency 85.23% 85.20% 84.66%
Turbine & Generator Efficiency 41.19% 31.51% 29.88%
Condenser Efficiency 53.33% 46.67% 43%
Heater LPH1 Effectiveness 0.46 0.5 0.51
Heater LPH2 Effectiveness 0.14 0.12 0.12
Heater LPH3 Effectiveness 0.13 0.13 0.13
Heater HPH5 Effectiveness 0.13 0.14 0.12
Heater HPH6 Effectiveness 0.29 0.31 0.33
Overall Plant Efficiency 36.74% 35.89% 33.67%
Coal Consumption 120 T/Hr 114 T/Hr 110 T/Hr
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