CN108708835A - A kind of novel solar complementation association circulating power generation system of cooling burning machine inlet air - Google Patents

Abstract

The invention discloses a novel solar thermal complementary combined cycle power generation system for cooling gas turbine inlet air. The power generation system consists of a gas-steam combined cycle generator set, a trough solar system and a single-effect lithium bromide absorption refrigeration unit. The solar heat absorbed by the trough solar system heats the feed water as a heat source to drive the single-effect lithium bromide absorption refrigeration unit to produce chilled water, which cools the inlet air temperature of the gas turbine compressor through the air-water heat exchanger, reducing the high temperature environment The temperature of the inlet air of the lower combustion engine is stabilized at around 5°C-10°C to improve the thermal efficiency of the gas turbine in the gas-steam combined cycle power generation unit and increase economic benefits. The power generation system of the invention can improve the working power of the gas-steam combined cycle generator set and ensure higher solar photoelectric efficiency, is easy to operate and maintain, fully utilizes renewable energy, and protects the environment.

Description

A Novel Solar Thermal Complementary Combined Cycle Power Generation for Cooling Gas Turbine Inlet Air system

technical field

The invention belongs to the technical field of solar energy and gas turbine combined power generation, and in particular relates to a solar thermal complementary combined cycle power generation system.

Background technique

Energy exhaustion and environmental pollution are one of the main problems facing society today, and the use of renewable energy is an effective way to solve this problem. Many scholars at home and abroad believe that solar thermal power generation technology is one of the most promising renewable energy power generation technologies in the future. The integration and complementarity of solar thermal energy and gas-steam combined cycle unit can improve unit efficiency, save fuel, and effectively utilize new energy. Internationally, this system is called "solar thermal complementary combined cycle".

For gas turbines in gas-steam combined cycle units (hereinafter referred to as gas turbines), the output will decrease by 0.5% to 0.9% for every 1°C increase in ambient temperature. And as the atmospheric temperature rises, the power consumption of the compressor increases, and while the output power of the gas turbine decreases, the thermal efficiency of the gas turbine decreases and the heat consumption increases. Every time the ambient temperature rises by 1°C, the heat consumption will increase by 0.2% to 0.3%. The invention proposes a new type of solar thermal complementary combined cycle power generation system for cooling the inlet air of the gas turbine, which reduces the temperature of the gas turbine inlet air and stabilizes it at a certain temperature. Compared with the traditional solar thermal complementary combined cycle system, it has better High thermodynamic advantages and economical advantages.

Contents of the invention

The purpose of this invention is to design a new solar thermal complementary combined cycle power generation system for cooling the inlet air of the gas turbine, reduce the temperature of the inlet air of the gas turbine, and stabilize it at a certain temperature, so as to improve the efficiency of the gas turbine in the gas-steam combined cycle power generation unit. thermal efficiency and increase economic benefits.

The technical solution of the present invention is a novel solar thermal complementary combined cycle power generation system for cooling the inlet air of the gas turbine, the gas turbine compressor (1) is connected with the gas turbine turbine (2) through the gas turbine combustion chamber (3); The air compressor (1), the gas turbine (2) and the second generator (31) are coaxially connected; the chilled water outlet of the single-effect lithium bromide absorption refrigeration unit (33) passes through the air-water heat exchanger (34) and The inlet of the gas turbine compressor (1) is connected; the outlet of the gas turbine (2) is connected to the inlet of the triple-pressure reheat waste heat boiler (32); the outlet of the steam turbine low-pressure cylinder (6) passes through the condenser (7), low-pressure Feed water pump (8), low-pressure economizer (11), low-pressure steam drum (24), low-pressure evaporator (12), low-pressure superheater (16) are connected to the inlet of steam turbine low-pressure cylinder (6); low-pressure economizer ( 11) The outlet passes through the high-pressure feed water pump (10), the first-stage high-pressure economizer (13), the second-stage high-pressure economizer (17), the high-pressure steam drum (26), the high-pressure evaporator (19), the first The first-stage high-pressure superheater (20), the second-stage high-pressure superheater (23) are connected to the inlet of the steam turbine high-pressure cylinder (4); the outlet of the second-stage high-pressure economizer (17) is connected to the first The inlet of the first-stage high-pressure superheater (20) is connected; the outlet of the low-pressure economizer (11) passes through the medium-pressure feed water pump (9), the medium-pressure economizer (14), the medium-pressure steam drum (25), and the medium-pressure evaporation (15), the medium pressure superheater (18) are connected with the inlets of the first-stage reheater (21) and the second-stage reheater (22); the outlet of the steam turbine high-pressure cylinder (4) is connected with the first-stage reheater The inlet of the reheater (21) is connected; the outlet of the second-stage reheater (22) is connected with the inlet of the steam turbine medium-pressure cylinder (5); the outlet of the steam turbine medium-pressure cylinder (5) is connected with the inlet of the steam turbine low-pressure cylinder (6) The steam turbine high-pressure cylinder (4), the steam turbine medium-pressure cylinder (5), the steam turbine low-pressure cylinder (6) are coaxially connected with the first generator (30); the outlet of the low-pressure feed pump (8) passes through the expansion tank (27), the The water pump (28), the trough solar system (29) are connected with the heat source water inlet of the single-effect lithium bromide absorption refrigeration unit (33).

After being cooled by the single-effect lithium bromide absorption refrigeration unit (33), the inlet air temperature of the gas turbine compressor (1) can be cooled to 5°C-10°C.

The trough solar system (29) is a trough-type concentrating heat-collecting mirror field (29).

Described single-effect lithium bromide absorption refrigerating unit (33), air-water heat exchanger (34), expansion tank (27), feed water pump (28), trough type concentrating heat collecting mirror field (29), condenser ( 7) Composing a solar energy single-effect lithium bromide absorption refrigeration subsystem; the single-effect lithium bromide absorption refrigeration unit (33) uses the feedwater heated by solar heat collected in the trough-type concentrating and heat-collecting mirror field (29) as a heat source to drive the refrigeration unit to work and generate Chilled water cools the temperature of the inlet air of the gas turbine compressor (1) through the air-water heat exchanger (34).

When the inlet air temperature of the gas turbine compressor (1) is cooled to 5°C-10°C, the feedwater at the outlet of the second-stage high-pressure economizer (17) is divided into two streams, and one stream flows into the high-pressure evaporator (19) ; Another stream flows through the trough-type concentrating heat-collecting mirror field (29) to absorb solar heat, and after reaching the same temperature as the outlet steam temperature of the high-pressure evaporator (19), it enters after mixing with the outlet steam of the high-pressure evaporator (19) The first stage high pressure superheater (20) is overheated.

The water supply at the outlet of the low-pressure feedwater pump (8) is divided into two streams, one of which flows into the low-pressure economizer (11); The heat collecting mirror field (29) absorbs sunlight heat and serves as the heat source feed water for driving the single-effect lithium bromide absorption refrigeration unit (33).

The novel solar thermal complementary combined cycle power generation system provided by the present invention for cooling gas turbine inlet air has the following advantages:

1. A novel solar thermal complementary combined cycle power generation system for cooling gas turbine inlet air of the present invention, utilizes the chilled water produced by the effective lithium bromide absorption refrigerating unit (33) of the single-slot solar system to pass through the air-water heat exchanger (34 ) cools the temperature of the inlet air of the gas turbine compressor (1), reduces the temperature of the inlet air of the gas turbine in a high temperature environment, and makes it stable at around 5°C-10°C, so as to improve the thermal efficiency of the gas turbine in the gas-steam combined cycle generator set , increase economic benefits.

2. When the inlet air temperature is cooled to 5°C-10°C, the solar heat absorbed by the trough-type concentrating and heat-collecting mirror field (29) is used to heat a part of the feed water at the outlet of the second-stage high-pressure economizer (17), Make it into high-pressure steam, after reaching the same temperature as the outlet steam temperature of the high-pressure evaporator (19), it is mixed with the outlet steam of the high-pressure evaporator (19) and enters the superheating of the first-stage high-pressure superheater (20), which improves the efficiency of the combined cycle. Work power and ensure higher solar photoelectric efficiency.

3. A novel solar thermal complementary combined cycle power generation system of the present invention for cooling gas turbine inlet air is easy to operate and maintain, fully utilizes renewable energy, and protects the environment.

Description of drawings

Fig. 1 is a schematic diagram of a novel solar thermal complementary combined cycle power generation system for cooling gas turbine inlet air according to the present invention.

The symbols in the figure are explained as follows:

1. Gas turbine compressor, 2. Gas turbine turbine, 3. Gas turbine combustion chamber, 4. Steam turbine high pressure cylinder, 5. Steam turbine medium pressure cylinder, 6. Steam turbine low pressure cylinder, 7. Condenser, 8. Low pressure feed water pump , 9. Medium pressure feed water pump, 10. High pressure feed water pump, 11. Low pressure economizer, 12. Low pressure evaporator, 13. First stage high pressure economizer, 14. Medium pressure economizer, 15. Medium pressure evaporation 16. Low-pressure superheater, 17. Second-stage high-pressure economizer, 18. Medium-pressure superheater, 19. High-pressure evaporator, 20. First-stage high-pressure superheater, 21. First-stage reheater, 22 .Second-stage reheater, 23. Second-stage high-pressure superheater, 24. Low-pressure steam drum, 25. Medium-pressure steam drum, 26. High-pressure steam drum, 27. Expansion water tank, 28. Feed water pump, 29. Tank type Concentrating heat collecting mirror field, 30. First generator, 31. Second generator, 32. Triple-pressure reheat waste heat boiler, 33. Single-effect lithium bromide absorption refrigeration unit, 34. Air-water heat exchanger.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below in conjunction with the drawings in the embodiments of the present invention.

Example

Fig. 1 is a schematic diagram of a novel solar thermal complementary combined cycle power generation system for cooling gas turbine inlet air described in this embodiment. Gas turbine compressor 1 is connected to gas turbine 2 through gas turbine combustion chamber 3; gas turbine compressor 1, gas turbine 2 are coaxially connected to second generator 31; The water outlet is connected to the inlet of the gas turbine compressor 1 through the gas-water heat exchanger 34; the outlet of the gas turbine 2 is connected to the inlet of the triple-pressure reheating waste heat boiler 32; the outlet of the low-pressure cylinder 6 of the steam turbine is connected to the condenser 7, Low-pressure feed water pump 8, low-pressure economizer 11, low-pressure steam drum 24, low-pressure evaporator 12, low-pressure superheater 16 are connected to the inlet of steam turbine low-pressure cylinder 6; the outlet of low-pressure economizer 11 passes through high-pressure feed water pump 10, the first stage High-pressure economizer 13, second-stage high-pressure economizer 17, high-pressure drum 26, high-pressure evaporator 19, first-stage high-pressure superheater 20, second-stage high-pressure superheater 23 are connected to the inlet of steam turbine high-pressure cylinder 4; The outlet of the secondary high-pressure economizer 17 is connected to the inlet of the first-stage high-pressure superheater 20 through the trough-type concentrating heat collecting mirror field 29; the outlet of the low-pressure economizer 11 is connected through the medium-pressure feed water pump 9 and the 14. The medium-pressure steam drum 25, the medium-pressure evaporator 15, and the medium-pressure superheater 18 are connected to the inlets of the first-stage reheater 21 and the second-stage reheater 22; the outlet of the high-pressure cylinder 4 of the steam turbine is connected to the first-stage reheater The inlet of the heater 21 is connected; the outlet of the second-stage reheater 22 is connected with the inlet of the steam turbine medium-pressure cylinder 5; the outlet of the steam turbine medium-pressure cylinder 5 is connected with the inlet of the steam turbine low-pressure cylinder 6; the steam turbine high-pressure cylinder 4, the steam turbine medium-pressure Cylinder 5, steam turbine low-pressure cylinder 6 and the first generator 30 are coaxially connected; the outlet of low-pressure feedwater pump 8 passes through expansion tank 27, feedwater pump 28, trough-type concentrating and heat-collecting mirror field 29, and single-effect lithium bromide absorption refrigeration unit 33 The heat source water inlet connection.

Among them, the single-effect lithium bromide absorption refrigeration unit 33, the air-water heat exchanger 34, the expansion tank 27, the feed water pump 28, the trough-type concentrating and heat-collecting mirror field 29, and the condenser 7 constitute the solar energy single-effect lithium bromide absorption refrigeration subsystem The single-effect lithium bromide absorption refrigerating unit 33 uses the feedwater heated by solar heat collected in the trough-type concentrating heat collecting mirror field 29 as a heat source to drive the refrigerating unit to work and produce chilled water to cool the gas turbine compressor 1 through the air-water heat exchanger 34 The temperature of the inlet air.

In this embodiment, a PG9351FA gas turbine is used; the air is compressed in the gas turbine compressor 1, and discharged into the gas turbine combustion chamber 3 for mixed combustion with fuel; the generated high-temperature and high-pressure flue gas flows into the gas turbine turbine 2 to perform work, and then discharged into the three-pressure gas turbine The reheating waste heat boiler 32 recycles the waste heat of the flue gas.

The exhausted steam in the low-pressure tank 6 of the steam turbine is discharged into the triple-pressure reheat waste heat boiler 32 after being condensed by the condenser 7 and initially boosted by the low-pressure feed water pump 8. Package 24, low-pressure evaporator 12 and low-pressure superheater 16 are converted from supercooled water to superheated steam, and mixed with exhaust steam from medium-pressure cylinder 5 of steam turbine to enter low-pressure cylinder 6 of steam turbine to perform work; the other feed water is boosted by medium-pressure feed water pump 9 After that, it flows through the medium-pressure economizer 14, the medium-pressure steam drum 25, the medium-pressure evaporator 15, and the medium-pressure superheater 18, transforms supercooled water into superheated steam and mixes it with the exhaust steam from the high-pressure cylinder 4 of the steam turbine, and then enters the first stage The reheater 21 reheats with the second-stage reheater 22, and the reheated steam flows through the medium-pressure cylinder 5 of the steam turbine to perform work; the last stream of feed water is boosted by the high-pressure feed water pump 10, and then flows through the first-stage high-pressure economizer 13 , the second-stage high-pressure economizer 17, the high-pressure steam drum 26, the high-pressure evaporator 19, the first-stage high-pressure superheater 20, and the second-stage high-pressure superheater 23, transform from a supercooled state to a superheated state, and flow through the steam turbine high pressure Cylinder 4 works.

The high-pressure cylinder 4 of the steam turbine, the medium-pressure cylinder 5 of the steam turbine, and the low-pressure cylinder 6 of the steam turbine are connected to the first generator 30 through shafts to convert mechanical energy into electrical energy; the turbine 2 of the gas turbine and the compressor 1 of the gas turbine are connected to the second generator 31 through shafts, Convert mechanical energy into electrical energy.

When the inlet air temperature of the gas turbine compressor 1 is cooled to around 5°C-10°C, the feedwater at the outlet of the second-stage high-pressure economizer 17 can be divided into two streams. In this embodiment, when the inlet air temperature is cooled to 5°C , divide the feed water at the outlet of the second high-pressure economizer 17 into two streams, one stream flows into the high-pressure evaporator 19; After the temperature of the outlet steam of the device 19 is the same, it is mixed with the outlet steam of the high-pressure evaporator 19 and enters the first-stage high-pressure superheater 20 for superheating. Increase the working power of the combined cycle and ensure higher solar photovoltaic efficiency.

The water supply at the outlet of the low-pressure feed water pump 8 has two streams, one of which flows into the low-pressure economizer 11; The heat source feedwater for driving the single-effect lithium bromide absorption refrigerating unit 33 .

The refrigerating unit of the single-effect lithium bromide absorption refrigerating unit 33 works to produce chilled water to pass through the air-water heat exchanger (34) to cool the temperature of the inlet air of the gas turbine compressor (1), reducing the temperature of the inlet air of the gas turbine in a high-temperature environment , so that it is stabilized at around 5°C-10°C. In this embodiment, the temperature of the inlet air is cooled to 5°C to improve the thermal efficiency of the gas turbine in the gas-steam combined cycle generator set and increase economic benefits.

The gas turbine is fueled by natural gas from the West-East Gas Pipeline, and the weather data is selected from a typical year in Dunhuang; Table 1 lists the basic data for thermodynamic analysis, and Table 2 lists the basic data for economic analysis.

Table 1 Basic data of thermodynamic analysis

Table 2 Basic data of economic analysis

Table 3 lists the data of the thermodynamic analysis results, and Table 4 lists the data of the economic analysis results.

Table 3 Thermodynamic analysis result data

Table 4 Economic Analysis Result Data

Combining the results shown in Table 3 and Table 4, it can be seen that the total power generation corresponding to the new solar thermal complementary combined cycle power generation system for cooling gas turbine inlet air in this embodiment is 3.38×10 ⁶ MW·h, and the net solar power generation is 2.92×10 ⁴ , the levelized cost of solar power generation is 0.179€/kWh, and the solar photovoltaic efficiency is 22.31%; the total power generation corresponding to the traditional solar thermal complementary combined cycle power generation system is 3.36×10 ⁶ MW h 0.02×10 ⁶ MW·h), the net solar power generation is 2.18×10 ⁴ (0.74×10 ⁴ lower than that of the new solar thermal complementary combined cycle power system cooling the inlet air of the gas turbine MW h), the levelized cost of solar power generation is 0.239€/kWh (0.06€/kWh higher than the new solar thermal complementary combined cycle power generation system with cooling gas turbine inlet air), and the solar photovoltaic efficiency is 16.67% (compared with cooling gas turbine imported air Air's new solar thermal complementary combined cycle power generation system is 5.64% lower).

Therefore, compared with the traditional solar thermal complementary combined cycle power generation system, the solar thermal complementary combined cycle power generation system proposed by the present invention for cooling the inlet air of the gas turbine has significant thermodynamic integration advantages and economical advantages.

The invention proposes a novel solar thermal complementary combined cycle power generation system for cooling the inlet air of the gas turbine. The solar heat collected in the trough solar subsystem is used as the heat source of the single-effect lithium bromide absorption refrigeration unit, which saves the fuel consumption of the refrigeration unit. Consumption; the chilled water generated by the single-effect lithium bromide absorption refrigeration unit cools the temperature of the intake air of the gas turbine compressor, which reduces the power consumption of the compressor and improves the efficiency of the gas turbine; the temperature of the intake air of the gas turbine compressor drops After the temperature reaches 5°C-10°C, the solar heat collected by the excess trough-type concentrating heat-collecting mirror field is integrated into the high-pressure evaporator inside the waste heat boiler, which can increase the working power of the combined cycle and ensure high solar photovoltaic efficiency.

Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: they can still modify the technical solutions described in the aforementioned embodiments, or perform equivalent replacements for some of the technical features; and these The modification or replacement does not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (6)

1. A novel solar thermal complementary combined cycle power generation system for cooling gas turbine inlet air, characterized in that: the gas turbine compressor (1) is connected to the gas turbine turbine (2) through the gas turbine combustion chamber (3); The air compressor (1), the gas turbine (2) and the second generator (31) are coaxially connected; the chilled water outlet of the single-effect lithium bromide absorption refrigeration unit (33) passes through the air-water heat exchanger (34) and The inlet of the gas turbine compressor (1) is connected; the outlet of the gas turbine (2) is connected to the inlet of the triple-pressure reheat waste heat boiler (32); the outlet of the steam turbine low-pressure cylinder (6) passes through the condenser (7), low-pressure Feed water pump (8), low-pressure economizer (11), low-pressure steam drum (24), low-pressure evaporator (12), low-pressure superheater (16) are connected to the inlet of steam turbine low-pressure cylinder (6); low-pressure economizer ( 11) The outlet passes through the high-pressure feed water pump (10), the first-stage high-pressure economizer (13), the second-stage high-pressure economizer (17), the high-pressure steam drum (26), the high-pressure evaporator (19), the first The first-stage high-pressure superheater (20), the second-stage high-pressure superheater (23) are connected to the inlet of the steam turbine high-pressure cylinder (4); the outlet of the second-stage high-pressure economizer (17) is connected to the first The inlet of the first-stage high-pressure superheater (20) is connected; the outlet of the low-pressure economizer (11) passes through the medium-pressure feed water pump (9), the medium-pressure economizer (14), the medium-pressure steam drum (25), and the medium-pressure evaporation (15), the medium pressure superheater (18) are connected with the inlets of the first-stage reheater (21) and the second-stage reheater (22); the outlet of the steam turbine high-pressure cylinder (4) is connected with the first-stage reheater The inlet of the reheater (21) is connected; the outlet of the second-stage reheater (22) is connected with the inlet of the steam turbine medium-pressure cylinder (5); the outlet of the steam turbine medium-pressure cylinder (5) is connected with the inlet of the steam turbine low-pressure cylinder (6) The steam turbine high-pressure cylinder (4), the steam turbine medium-pressure cylinder (5), the steam turbine low-pressure cylinder (6) are coaxially connected with the first generator (30); the outlet of the low-pressure feed pump (8) passes through the expansion tank (27), the The water pump (28), the trough solar system (29) are connected with the heat source water inlet of the single-effect lithium bromide absorption refrigeration unit (33). 2. A novel solar thermal complementary combined cycle power generation system for cooling gas turbine inlet air according to claim 1, characterized in that, through the cooling of the single-effect lithium bromide absorption refrigeration unit (33), the gas turbine can The inlet air temperature of compressor (1) is cooled to 5 ℃-10 ℃. 3. A novel solar thermal complementary combined cycle power generation system for cooling gas turbine inlet air according to claim 1, characterized in that the trough solar system (29) is a trough-type concentrating heat-collecting mirror field (29 ). 4. A novel solar thermal complementary combined cycle power generation system for cooling gas turbine inlet air according to claim 1 or 3, characterized in that the single-effect lithium bromide absorption refrigeration unit (33), gas-water heat exchange The solar energy single-effect lithium bromide absorption refrigeration subsystem is composed of a solar energy single-effect lithium bromide absorption refrigeration subsystem by a device (34), an expansion tank (27), a feed water pump (28), a trough-type concentrating heat-collecting mirror field (29), and a condenser (7); The refrigerating unit (33) uses the feedwater heated by solar heat collected in the trough-type concentrating heat-collecting mirror field (29) as a heat source to drive the refrigerating unit to work and generate chilled water to cool the gas turbine compressor ( 1) The temperature of the inlet air. 5. A novel solar thermal complementary combined cycle power generation system for cooling gas turbine inlet air according to claim 1 or 3, characterized in that the inlet air temperature of the gas turbine compressor (1) is cooled to 5°C- At 10°C, the feed water at the outlet of the second-stage high-pressure economizer (17) is divided into two streams, one stream flows into the high-pressure evaporator (19); Solar heat, after reaching the same temperature as the outlet steam temperature of the high-pressure evaporator (19), enters the superheating of the first-stage high-pressure superheater (20) after mixing with the outlet steam of the high-pressure evaporator (19). 6. A new type of solar thermal complementary combined cycle power generation system for cooling gas turbine inlet air according to claim 1 or 3, characterized in that the water supply at the outlet of the low-pressure feed water pump (8) is two streams, one One stream flows into the low-pressure economizer (11); the other stream flows through the expansion tank (27), the feedwater pump (28), and the trough-type concentrating heat-collecting mirror field (29) to absorb sunlight and heat as a driving single-effect lithium bromide absorption type The heat source feed water of refrigeration unit (33).