The gas turbine-jet pump coupling in cogeneration plants |
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| Institution: | 1. Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China;2. School of Energy and Environment, Zhongyuan University of Technology, Zhengzhou 450007, China |
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| Abstract: | When a steam driven jet pump is coupled to a gas turbine it can decrease the exhaust total pressure of the turbine and thus increase its output and the gas turbine thermal efficiency. If the steam is generated in a waste heat recovery the thermal efficiency of the engine may increase by 2–3%. The present paper studies the gas turbine-jet pump coupling, at various partial loads, by incorporating the long exhaust diffuser as a water preheater. In addition, additional firing may be introduced at the boiler inlet to keep the temperatures of the boiler constant. The results indicate that the efficiency of the gas turbine increases by 3–4% at optimum conditions. |
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