5.4 A single-pressure combined-cycle power plant consists of a gas turbine, HRSG, supplementary firing, and steam turbine plant. The compressor

Elements Of Electromagnetics
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5.4 A single-pressure combined-cycle power plant consists of a gas turbine,
HRSG, supplementary firing, and steam turbine plant. The compressor
Transcribed Image Text:5.4 A single-pressure combined-cycle power plant consists of a gas turbine, HRSG, supplementary firing, and steam turbine plant. The compressor
inlet temperature is 15°C, its pressure ratio is 15, and isentropic efficiency
is 0.88. The 200 MW gas turbine burns natural gas with 380% of theo-
retical air; the higher heating value of the gas is 49.5 MJ/kg. The gas
turbine has an inlet temperature of 1270°C and isentropic efficiency of
0.92. supplementary firing uses a bituminous coal with a higher heating
value of 34 MJ/kg to raise the gas temperature to 900°C before enter-
ing the HRSG. Steam is generated at 9 MPa and 540°C from feedwater
at 110°C. The pinch point in the HRSG is 13 K. The flue gas leaves the
HRSG to the stack at 250°C. Assume an isentropic exponent of 1.4 and a
specific heat of 1.05 kJ/kg K for the working fluid of the gas turbine and
of 4.187 kJ/kg K for water.
Calculate (a) the heat addition qsF in supplementary firing per kg of the
gas turbine exhaust gas, (b) the net specific work of the gas turbine plant
WGT, (C) the air mass flow rate mair, (d) the thermal efficiency of the gas
turbine plant nGT, (e) the rate of steam generation in the HRSG m,, and
(f) the ratio mĮmair:
Transcribed Image Text:inlet temperature is 15°C, its pressure ratio is 15, and isentropic efficiency is 0.88. The 200 MW gas turbine burns natural gas with 380% of theo- retical air; the higher heating value of the gas is 49.5 MJ/kg. The gas turbine has an inlet temperature of 1270°C and isentropic efficiency of 0.92. supplementary firing uses a bituminous coal with a higher heating value of 34 MJ/kg to raise the gas temperature to 900°C before enter- ing the HRSG. Steam is generated at 9 MPa and 540°C from feedwater at 110°C. The pinch point in the HRSG is 13 K. The flue gas leaves the HRSG to the stack at 250°C. Assume an isentropic exponent of 1.4 and a specific heat of 1.05 kJ/kg K for the working fluid of the gas turbine and of 4.187 kJ/kg K for water. Calculate (a) the heat addition qsF in supplementary firing per kg of the gas turbine exhaust gas, (b) the net specific work of the gas turbine plant WGT, (C) the air mass flow rate mair, (d) the thermal efficiency of the gas turbine plant nGT, (e) the rate of steam generation in the HRSG m,, and (f) the ratio mĮmair:
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