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 efficiencyis 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 gasturbine has an inlet temperature of 1270°C and isentropic efficiency of0.92. supplementary firing uses a bituminous coal with a higher heatingvalue 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 feedwaterat 110°C. The pinch point in the HRSG is 13 K. The flue gas leaves theHRSG to the stack at 250°C. Assume an isentropic exponent of 1.4 and aspecific heat of 1.05 kJ/kg K for the working fluid of the gas turbine andof 4.187 kJ/kg K for water.Calculate (a) the heat addition qsF in supplementary firing per kg of thegas turbine exhaust gas, (b) the net specific work of the gas turbine plantWGT, (C) the air mass flow rate mair, (d) the thermal efficiency of the gasturbine plant nGT, (e) the rate of steam generation in the HRSG m,, and(f) the ratio mĮmair:

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Answered: 5.4 A single-pressure combined-cycle…

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

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question

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:

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