Gas Turbine and Combined Power Plant Performance Analysis
Explore the performance analysis of a 5 MW gas turbine generating set with intercooling and a 190 MW combined power plant comprising a gas turbine unit and a steam turbine unit. Calculate thermal efficiency, work ratio, mass flow rates, and more in ideal processes.
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Presentation Transcript
Example (3) : A (5 MW) Gas turbine generating set operates with Intercooling between the two compressor stages. The overall compression ratio is (9/1). A high-pressure turbine is used to drive the compressors, and a low-pressure turbine to drive the generator. The gases entering the high-pressure turbine have a temperature of (650 C) and are reheated to (650 C) after expansion in the first turbine. The exhaust gases leaving the low-pressure turbine pass through a heat exchanger to heat the air leaving the high-pressure stage compressor. The compressors have equal compression ratios and intercooling is complete between the two stages. The inlet temperature of the air to the unit is (15 C). The isentropic efficiency of each compressor is (80%), and the isentropic efficiency of each turbine stage is (85%). The heat ratio of the heat exchanger is (75%). A mechanical efficiency of (98%) can be assumed for both the power shaft and the compressor turbine shaft. Neglecting all energy losses and changes in kinetic energy, and neglecting the mass of the fuel. Estimate the following: 1. The plant thermal efficiency 2. The work ratio 3. The mass flow rate in (kg/s). T I.C 3 2 650 C L.P H.P 650 C H.P.T 6 8 7 7 4 6 9 C.C2 15 C 7 1 P1 9 8 650 C 5 5 MW C.C1 4 10 2 4 2 L.P.T 3 5 1 T1=T3 H.E 9 10 S
Example (4) : A total power output of (190 MW) is generated from a combined power plant which consists of a gas turbine unit and a steam turbine unit. The exhaust gas from the turbine being the supply gas to the steam generator at which a further supply of fuel is burned in the gas. The pressure ratio for the gas turbine is (8/1), and the inlet air temperature is (15 C) and the maximum cycle temperature is (800 C). Combustion at the steam generator raises the gas temperature to (800 C), and the gas leaves the steam generator at (100 C). The steam condition at the steam turbine inlet is (60 bar, 600 C) and the condenser pressure is (0.05 bar). Assume ideal processes for both units. Neglect the mass of fuel and the feed pump work. Estimate the following: 1. The mass flow rates of air and steam 2. The thermal efficiency of the combined plant 3. The overall (Air/Fuel) ratio, Assume the following: 7 C.C 800 C 100 C 6 2 3 T C T B 8 4 1 C.C2 10 5 9 800 C P2 T T 3 5 7 10 P1 2 6 8 9 4 1 S S
