Two-stage organic Rankine cycle power generation system utilizing exhaust heat of gas turbine

Abstract

The invention discloses a two-stage organic Rankine cycle power generation system utilizing exhaust heat of a gas turbine. The system comprises a gas compressor (1), the gas turbine (3), a high-temperature steam turbine (11), a low-temperature steam turbine (15) and a power generator (18), wherein the gas compressor (1) is connected with a combustion chamber (2) through a pipeline; the combustion chamber (2) is connected with the gas turbine (3) through a pipeline; the gas turbine (3) is connected with a waste heat boiler (4) through a flue gas pipeline; the waste heat boiler (4) is connected with the high-temperature steam turbine (11) through a high-temperature organic Rankine cycle system (19) and connected with the low-temperature steam turbine (15) through a low-temperature organic Rankine cycle system (20). Through combined use of the high-temperature organic Rankine cycle system and the low-temperature organic Rankine cycle system, gradient utilization of flue gas waste heat of the gas turbine is realized.

Description

technical field [0001] The invention relates to a two-stage organic Rankine cycle power generation system for utilizing exhaust heat of a gas turbine, and belongs to the field of power generation equipment. Background technique [0002] At present, my country is still dominated by coal-fired power generation, which has brought serious pollution problems; coal-fired power plants are far away from central cities, and there is a certain amount of energy loss through power grid transmission and distribution, and the overall energy utilization efficiency is low. The distributed energy system conforms to the "cascaded utilization" criterion of the total energy system, and has the advantages of high energy utilization efficiency, various energy supply methods, environmental protection, etc., and provides energy at a short distance, reducing the energy loss of electric energy and heat energy during transmission. . In recent years, distributed energy systems with small gas turbines ...

AI Technical Summary

Problems solved by technology

The exhaust gas temperature of a small gas turbine is 400-550°C. If a steam turbine is used to recover exhaust heat, the capacity of the steam turbine will be small due to the small flow rate of the flue gas, and the thermal efficiency will be low. The equipment investment will be large, the floor area will be large, and the variable load capacity will be large. Poor, low yield, so the exhaust heat of small gas turbines is often used directly for heating or lithium bromide absorption refrigeration in projects

Direct heat utilization, low energy quality factor, and limited by seasonal factors, may not be able to fully utilize the exhaust waste heat, and thus cannot give full play to the advantages of energy cascade utilization

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