A Combined power plant consists of a gas turbine unit and a steam turbine unit. The exhaust gas from the open-cycle gas turbine is the supply gas to the steam generator of the steam turbine cycle at which additional fuel is burned in the gas. The pressure ratio for the gas turbine is 16, the air inlet temperature is 180C, and the maximum cycle temperature is 8000C. Combustion in the steam generator raises the gas temperature to 8000C and the gas leaves the generator to the chimney at 1100C. Steam is supplied to the steam turbine at 60 bar, 6500C, and the condenser pressure is 0.1 bar.The isentropic efficiencies of the air compressor, gas turbine, and steam turbine are 85%, 88%, and 87% respectively. Taking Cp = 1.11 Kj/kgK and adiabatic index= 1.33 for the combustion gases, and neglecting the effect of the mass flow rate of fuel, feed-pump work, and all pressure losses, calculate;The required flow rates of air and steam for a total output of 200 MW;The power output of each unit;The overall efficiency of the plant.

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Answered: A Combined power plant consists of a…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

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A Combined power plant consists of a gas turbine unit and a steam turbine unit. The exhaust gas from the open-cycle gas turbine is the supply gas to the steam generator of the steam turbine cycle at which additional fuel is burned in the gas. The pressure ratio for the gas turbine is 16, the air inlet temperature is 18⁰C, and the maximum cycle temperature is 800⁰C. Combustion in the steam generator raises the gas temperature to 800⁰C and the gas leaves the generator to the chimney at 110⁰C. Steam is supplied to the steam turbine at 60 bar, 650⁰C, and the condenser pressure is 0.1 bar.

The isentropic efficiencies of the air compressor, gas turbine, and steam turbine are 85%, 88%, and 87% respectively. Taking Cp = 1.11 Kj/kgK and adiabatic index= 1.33 for the combustion gases, and neglecting the effect of the mass flow rate of fuel, feed-pump work, and all pressure losses, calculate;

The required flow rates of air and steam for a total output of 200 MW;
The power output of each unit;
The overall efficiency of the plant.

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