Combined System of intercooled Recuperative Gas Turbine and Organic Compound Bottoming Cycle

Abstract

The invention discloses a combined system of intercooled recuperative gas turbine and organic compound bottoming cycle, comprising intercooled recuperative gas turbine, organic-gas heater, organic working substance turbine, condenser and pressure pump, the organic-gas heater is connected to recuperator of intercooled recuperative gas turbine, the organic-gas heater is connected to organic working substance turbine, the organic working substance turbine is connected to condenser, the condenser is connected to pressure pump, the pressure pump is connected to intercooler of intercooled recuperative gas turbine, the intercooler is connected to organic-gas heater; by adopting the invention, it can overcome problems of insufficient heat exchange and large exergy loss in intercooler caused by constant evaporation temperature when using subcritical organic Rankine cycle and Kalina cycle, and can also ensure that the entire system maintains a higher power generation efficiency than intercooled recuperative gas turbine and improves gas turbine power output in hot climates.

1 . A combined system of intercooled recuperative gas turbine and organic compound bottoming cycle, comprising intercooled recuperative gas turbine ( 1 ), organic-gas heater ( 2 ), organic working substance turbine ( 3 ), condenser ( 4 ), pressure pump ( 5 ) and organic working substance preheater ( 12 ); the organic-gas heater ( 2 ) is connected to recuperator ( 11 ) of the intercooled recuperative gas turbine ( 1 ), the organic-gas heater ( 2 ) is connected to the organic working substance turbine ( 3 ), the organic working substance turbine ( 3 ) is connected to the condenser ( 4 ), the condenser ( 4 ) is connected to the pressure pump ( 5 ), the pressure pump ( 5 ) is connected to intercooler ( 10 ) of the intercooled recuperative gas turbine ( 1 ), the intercooler ( 10 ) is connected to the organic-gas heater ( 2 ); the intercooler ( 10 ) is connected in parallel to the organic working substance preheater ( 12 ); the condenser ( 4 ) is used for cooling and condensing the organic working substance into liquid and delivering the same to the pressure pump ( 5 ), the pressure pump ( 5 ) is used for pressurizing the organic working substance to exceed the critical pressure and delivering the same to the intercooler ( 10 ), the intercooler ( 10 ) is used for preheating the organic working substance and delivering the same to the organic-gas heater ( 2 ), the organic-gas heater ( 2 ) is used for heating the organic working substance to above the critical temperature and delivering the same to the organic working substance turbine ( 3 ), the organic working substance turbine ( 3 ) is used for making use of the expansion of the organic working substance and delivering the same to the condenser ( 4 ); the organic-gas heater ( 2 ) cools the gas input from the recuperator ( 11 ) and discharges the same thereafter. 
     
     
         2 . The combined system of intercooled recuperative gas turbine and organic compound bottoming cycle of  claim 1 , further comprising first throttle valve ( 6 ), second throttle valve ( 13 ), first compressor ( 7 ) and second compressor ( 14 ), the throttle valves are connected to the condenser ( 4 ), the throttle valves are connected to inlet air cooler ( 9 ) of the intercooled recuperative gas turbine ( 1 ) through the second throttle valve ( 13 ), the inlet air cooler ( 9 ) is connected to the first compressor ( 7 ) through the second compressor ( 14 ), the first compressor ( 7 ) is connected to the condenser ( 4 ); organic working substance discharged by the condenser ( 4 ) enters into the first throttle valve ( 6 ) and the second throttle valve ( 13 ), and the first throttle valve ( 6 ) and the second throttle valve ( 13 ) cools the entered organic working substance and discharges the same into the inlet air cooler ( 9 ), the organic working substance in the inlet air cooler ( 9 ) absorbs heat and enters into the first compressor ( 7 ) and the second compressor ( 14 ), then enters into the condenser ( 4 ) after pressurized by the first compressor ( 7 ) and the second compressor ( 14 ). 
     
     
         3 . The combined system of intercooled recuperative gas turbine and organic compound bottoming cycle of  claim 2 , also comprising heat exchanger ( 8 ), one input end of the heat exchanger ( 8 ) is connected to the pressure pump ( 5 ), one output end corresponding to the input end thereof is connected to the intercooler ( 10 ); the other input end of the heat exchanger ( 8 ) is connected to one output end of the first throttle valve ( 6 ), the other output end corresponding to the input end thereof is connected to one input end of the first compressor ( 7 ), the heat exchanger ( 8 ) conducts heat exchange between the organic working substance input by the pressure pump ( 5 ) and the organic working substance input by the first throttle valve ( 6 ). 
     
     
         4 . The combined system of intercooled recuperative gas turbine and organic compound bottoming cycle of  claim 1 , wherein the organic working substance adopts R1336mzz(Z).