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.

Claims

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).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the invention or the technical schemes in the prior art, the drawings of the embodiments or the prior art will be briefly described below. In all accompanying drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to actual scale.

[0019] FIG. 1 shows the overall structure of the invention.

[0020] In the accompanying drawing: 1 refers to intercooled recuperative gas turbine, 2 refers to organic-gas heater, 3 refers to organic working substance turbine, 4 refers to condenser, 5 refers to pressure pump, 6 refers to first throttle valve, 7 refers to first compressor, 8 refers to organic-organic heat exchanger, 9 refers to inlet air cooler, 10 refers to intercooler, 11 refers to recuperator, 12 refers to organic working substance preheater, 13 refers to second throttle valve, 14 refers to second compressor.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

[0021] The embodiments of the technical schemes of the invention will be described in detail with reference to the drawings. The following embodiments are only used to more clearly explain the technical schemes of the invention, and therefore are only used as examples, and cannot be used to limit the protection scope of the invention.

[0022] It should be noted that, unless there are specific statement, the technical or scientific terms used in the invention should be in the ordinary meaning understood by those skilled in the art.

Embodiment

[0023] As shown in FIG. 1, the embodiment comprises 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. The organic working substance preheater 12 and the intercooler 10 are connected in parallel and are used for preheating the organic working substance, mixing the organic working substance together into the organic-gas heater, and raising the temperature of the organic working substance to above the critical temperature.

[0024] The embodiment also comprises 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, and enters into the condenser 4 after pressurized by the first compressor 7 and the second compressor 14. The arrangement of two sets of throttle valves and compressors, together with the inlet air cooler, form the intake air cooling subsystem of the gas turbine, further optimizing the performance of the overall device.

[0025] In order to achieve a better cooling effect for the intercooler 10, the embodiment further comprises a organic-organic 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.

[0026] In the embodiment, the organic working substance adopts R1336mzz(Z), and the organic working substance in the embodiment may also use other organic working substances.

[0027] In the embodiment, the flow rate and heat exchange temperature difference of the supercritical organic working substance are determined according to the air parameters of the compressor intermediate stage and the rear flue gas parameters of the intercooled recuperative gas turbine 1, to ensure not only that the waste heat from the intercooler 10 can be fully absorbed, but also the organic working substance can be heated above the critical temperature in the organic-gas heater 2. The working pressure and temperature of the refrigeration cycle are determined according to the extreme climatic conditions of the entire system, thereby determining the heat exchange duty and area of the heat exchanger 8 and the organic-gas heater 2, in the embodiment, the intercooled recuperative gas turbine 1 adopts air Brayton cycle, and can also adopt an opened or closed air, or other Brayton cycle with other gas substances.

[0028] The gas turbine energy may come from fuel chemical energy from combustion or from other heat sources such as concentrating solar energy etc., and the reheater is optional although it is common for intercooling recuperative gas turbine.

[0029] The appearance, quantity and size of the invention can be adjusted according to the size of the place of use, but the internal structure and principle remain unchanged.

[0030] It should be noted that: the above embodiments are only used to describe the technical schemes of the invention and the invention is not limited thereto; although the invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical schemes described in the foregoing embodiments, or equivalently replace some or all of the technical features; and the modifications or replacements should be within the scope of the embodiments of the invention, and all should be included in the scope of protection of the claims and specification in the invention.