CN217976391U - Gas turbine combined cycle power generation system under distributed energy environment - Google Patents

Abstract

The utility model discloses a gas turbine combined cycle power generation system under distributed energy environment, which comprises a tower type solar power generation system, a gas turbine power generation system and a Kalina cycle power generation system; the Kalina cycle power generation system is used for recovering waste heat of exhaust gas of a gas turbine, the tower type solar power generation system is used for increasing the heat of the Kalina cycle power generation system, and the gas turbine power generation system is used for receiving the heat transmitted by the tower type solar power generation system to generate power; the tower type solar power generation system, the gas turbine power generation system and the Kalina circulating power generation system are coupled with one another. The utility model discloses but energy saving and emission reduction, make full use of gas turbine's waste heat flue gas, make full use of waste heat resource reduces the waste of the energy.

Description

A gas turbine combined cycle power generation system in a distributed energy environment

technical field

The utility model belongs to the technical field of distributed energy power generation, in particular to a gas turbine combined cycle power generation system in a distributed energy environment.

Background technique

The role of the gas turbine is energy conversion, which mainly converts the chemical energy of the fuel into mechanical energy. Compared with traditional power generation equipment, the gas turbine has the advantage of being light and fast, because it saves a lot of trouble in equipment, such as condensers, etc. At present, the efficiency has reached 40%, and the joint type has 40 to 50%, which is no less than the conversion rate of large-scale equipment. The equipment is widely used in various power stations due to its convenience, flexibility and high efficiency. However, this equipment is not perfect, and there are still many deficiencies, such as requiring higher quality fuel, and the service life is not long.

Natural gas is a green energy with "zero harmful emissions and less greenhouse emissions". Using it as the main fuel for power generation can not only reduce the pollution to the environment, but also has great advantages in utilization efficiency. Because compared with other energy sources, natural gas can be converted more completely. In recent years, the proportion of natural gas exploitation and consumption in my country's energy share has been increasing year by year. The West-East Gas Transmission Project has also created favorable conditions for the large-scale utilization of natural gas and facilitated the vigorous development of gas turbine power plants in my country. However, compared with the future demand for natural gas, the supply of natural gas in my country is still far behind and cannot meet the demand for gas-fired power generation. In this case, more combined cycle systems need to be excavated in order to increase the utilization rate of natural gas and improve the efficiency of gas turbine combined cycle.

Contents of the invention

In order to overcome the above technical problems, the utility model provides a gas turbine combined cycle power generation system in a distributed energy environment. The system can save energy and reduce emissions, make full use of the waste heat and flue gas of the gas turbine, make full use of waste heat resources, and reduce energy waste.

In order to achieve the above object, the technical solution adopted by the utility model is:

A gas turbine combined cycle power generation system in a distributed energy environment, including three parts: a tower solar power generation system 100, a gas turbine power generation system 200 and a Kalina cycle power generation system 300;

The Kalina cycle power generation system 300 recovers waste heat from gas turbine exhaust, converts heat energy into mechanical energy, and drives the second generator 19 to generate electricity. The tower solar power generation system 100 is used to increase the heat of the Kalina cycle power generation system 300. The gas turbine power generation system 200 is used to generate power by receiving the heat transferred by the tower solar power generation system 100;

The tower solar power generation system 100 , the gas turbine power generation system 200 and the Kalina cycle power generation system 300 are coupled to each other.

The tower type solar power generation system 100 includes a mirror field 2, the mirror field 2 is used to reflect solar energy 1 to the heat absorber 3, and the inlet of the heat absorber 3 is communicated with the outlet of the molten salt pump 8; The outlet of the heat absorber 3 communicates with the inlet of the heat source pipeline of the first regenerator 5, and the inlet of the heat source pipeline of the first regenerator 5 passes through the heat source pipeline of the second regenerator 6 and the molten salt tank 7 The inlet of the molten salt tank 7 is connected, and the outlet of the molten salt tank 7 is connected to the inlet of the molten salt pump 8;

The gas turbine power generation system 200 includes a first compressor 9 for providing compressed air, the compressed air outlet of the first compressor 9 is connected to a lithium bromide refrigeration system 10, and the lithium bromide refrigeration system 10 is used to output the first compressor 9 The compressed air is cooled, and the lithium bromide refrigeration system 10 is connected to the second regenerator 6 through the second compressor 11, and the second regenerator 6 preheats the natural gas and the compressed air from the second compressor 11, and the preheated natural gas Combustion with compressed air in the combustion chamber 12, the flue gas produced works in the gas turbine 13 to drive the first generator 14 to generate electricity;

The Kalina cycle power generation system 300 includes an evaporator 15, and the evaporator 15 uses the high-temperature exhaust gas of the gas turbine to perform heat exchange to preheat the basic ammonia solution after heat exchange by the third regenerator 20, and the evaporator 15 exchanges heat The final basic ammonia solution is the basic ammonia solution in the two-phase region, and is output to the separator 16, and the separator 16 separates the basic ammonia solution in the two-phase region, and outputs saturated ammonia-rich steam and saturated ammonia-poor solution. The saturated ammonia-rich steam is converted into superheated steam through the first regenerator 5, and the superheated steam converts thermal energy into mechanical energy through the ammonia turbine 18 to drive the second generator 19 to generate electricity;

The ammonia-poor solution is connected to the first mixer 22 through the third regenerator 20, and the first mixer 22 is used to equalize the exhaust steam output by the ammonia gas turbine 18 and the decompressed saturated ammonia-lean solution. Mixing and outputting the mixed working fluid of the basic ammonia solution, the output end of the mixer 22 is connected to the condenser 23, and the working fluid pump 24 is used to pressurize the basic ammonia solution output by the condenser 23 and then input it into the third regenerator 20.

A throttle valve 21 for throttling and reducing the pressure of the high-pressure ammonia-lean solution is arranged between the third regenerator 20 and the first mixer 22 .

A method for operating a gas turbine combined cycle power generation system in a distributed energy environment, comprising the following steps:

Air is sent into the first compressor 9, and the compressed air after the output compression treatment is processed; the compressed air enters the lithium bromide refrigeration system 10, absorbs the heat of the compressed air at the outlet of the first compressor 9, and the compressed air cools down and depressurizes in the lithium bromide refrigeration system 10;

The cooled compressed air is sent to the second compressor 11 to be compressed into high-pressure air; the compressed air and fuel are preheated by the second regenerator 6, and after preheating, they are sent to the combustion chamber 12 for mixed combustion to generate smoke gas; the flue gas expands in the gas turbine 13 to perform work, and is used to drive the first generator 14 to generate electric energy;

The molten salt absorbs solar energy in the heat absorber 3, the temperature of the molten salt rises, and a part of the high-temperature molten salt enters the first regenerator 5, and transfers heat to the saturated ammonia-rich steam to generate superheated steam, which improves the efficiency of the ammonia turbine. 18 intake air temperature; the other part controls the heat released by the molten salt to the fuel and compressed air under the action of the first regulating valve 4, wherein the larger the opening of the first regulating valve 4, the more heat released to the compressed air and natural gas high;

The exhaust gas of the gas turbine releases heat to the basic ammonia solution in the evaporator 15, and the heated basic ammonia solution enters the separator 16, and is separated into a rich ammonia vapor and a lean ammonia solution; after passing through the first regenerator 5, the rich ammonia vapor is transformed into The superheated steam expands in the ammonia turbine 18 to perform work, and the exhaust steam of the ammonia turbine 18 is mixed with the lean ammonia solution to produce a basic ammonia solution, which then releases heat in the condenser 23, and the basic ammonia solution at the outlet of the condenser 23 Pressurized by the working fluid pump to generate high-pressure basic ammonia solution, the basic ammonia solution flows through the third regenerator 20 and then sent to the evaporator 15, and finally completes the entire thermal cycle.

The beneficial effects of the utility model:

The system of the utility model can save energy and reduce emissions. The tower solar power generation system, the gas turbine power generation system and the Kalina cycle power generation system are coupled to make full use of clean solar energy resources and low-cost ammonia water. The Kalina cycle power generation system is used to control the gas turbine Waste heat is recovered from the exhaust, avoiding the waste of high-quality heat energy. In addition, the system of the utility model has multiple forms, which makes the system small and flexible. Compared with the traditional gas-steam combined cycle, the utility model adopts the method of cooling the compressed air, which reduces the power consumption of the compressor.

In the utility model, solar energy is used to provide stable energy input for the gas-steam combined cycle, which saves fuel on the one hand, and realizes energy saving and emission reduction on the other hand. Specifically, the utility model uses solar energy to heat the saturated ammonia-rich steam, which increases the heat input to the Kalina cycle power generation system, improves the intake temperature of the ammonia gas turbine, and is beneficial to improving the working capacity of the steam turbine. In addition, the use of molten salt to preheat the fuel and compressed air in front of the combustion chamber reduces the heat loss of the combustion chamber and reduces fuel consumption.

Description of drawings

Fig. 1 is a schematic diagram of a new gas turbine combined cycle power generation system according to an embodiment of the present invention.

In the figure, 100, tower solar power generation system; 200, gas turbine power generation system; 300, Kalina cycle power generation system;

1. Sun; 2. Mirror field; 3. Heat absorber; 4. First regulating valve; 5. First regenerator; 6. Second regenerator; 7. Molten salt tank; 8. Molten salt pump

9. First compressor; 10. Lithium bromide refrigeration system; 11. Second compressor; 12. Combustion chamber; 13. Gas turbine; 14. First generator

15. Evaporator; 16. Separator; 17. Second regulating valve; 18. Ammonia turbine; 19. Second generator; 20. Third regenerator; 21. Throttle valve; 22. Mixer; 23. Condenser; 24. Working medium pump.

detailed description

Below in conjunction with accompanying drawing, the utility model is described in further detail.

Referring to Fig. 1, a gas turbine Kalina combined cycle power generation system based on a distributed energy environment of the present utility model includes three parts:

The first part is a tower solar power generation system 100, including: solar energy 1, mirror field 2, heat absorber 3, first regulating valve 4, first regenerator 5, second regenerator 6, molten salt tank 7, melting Salt pump 8 etc. components are formed.

The mirror field 2 is used to reflect solar energy 1 to the heat absorber 3;

The inlet of the heat absorber 3 communicates with the outlet of the molten salt tank 7 through the molten salt pump 8; the outlet of the heat absorber 3 is connected to the first regenerator 5 and the second regenerator. The inlet of the heat source pipeline of heater 6 is connected;

The inlet of the heat source pipeline of the first regenerator 5 communicates with the inlet of the molten salt tank 7 through the heat source pipeline of the second regenerator 6;

The second part is a gas turbine power generation system 200, including: a first compressor 9, a lithium bromide refrigeration system 10, a second compressor 11, a combustion chamber 12, a gas turbine 13, a first generator 14 and other components.

The first compressor 9 is used to obtain compressed air;

The lithium bromide refrigeration system 10 uses lithium bromide as a refrigerant to cool down the air at the outlet of the first compressor 9;

The second regenerator 6 is used for the high-temperature molten salt to release heat to the compressed air and natural gas of the second compressor 11;

The combustion chamber 12 is used for mixed combustion of preheated natural gas and compressed air to generate high-temperature and high-pressure flue gas;

The gas turbine 13 is used for inputting the flue gas output from the combustion chamber 12 and performing expansion and work to drive the first generator 14 to generate electricity.

The third part is the Kalina cycle power generation system 300, including: evaporator 15, separator 16, second regulating valve 17, ammonia gas turbine 18, second generator 19, third regenerator 20, throttle valve 21, Mixer 22, condenser 23, working medium pump 24.

The evaporator 15 is used to exchange heat between the basic ammonia solution after heat exchange in the third regenerator 20 and the high-temperature exhaust gas of the gas turbine; the basic ammonia solution after the heat exchange in the evaporator 15 is the basic ammonia solution in the two-phase region Ammonia solution for output to the separator 16;

The separator 16 is used to input and separate the basic ammonia solution in the two-phase zone, and output saturated ammonia-rich vapor and saturated ammonia-lean solution;

The first regenerator 5 is used to use the high-temperature molten salt of the tower solar system to release heat energy to the saturated ammonia-rich steam output by the separator 16, and convert the saturated ammonia-rich steam into superheated steam;

The ammonia turbine 18 is used to convert the thermal energy of the superheated steam heated by the first regenerator 5 into mechanical energy to drive the second generator 19 to generate electricity;

The second generator 19 is used to convert mechanical energy into electrical energy;

The throttle valve 21 is used for throttling and reducing the pressure of the high-pressure lean ammonia solution;

The first mixer 22 is used to mix the exhaust steam output by the ammonia turbine 18 with the decompressed saturated lean ammonia solution isobarically, and output the basic ammonia solution mixed working fluid;

The condenser 23 is used to condense the mixed working medium of the basic ammonia solution output by the mixer 22 into a supercooled basic ammonia solution;

The working medium pump 24 is used for pressurizing the basic ammonia solution;

In the third regenerator 20, the saturated lean ammonia solution is used to heat the subcooled basic ammonia solution to increase its temperature.

The further improvement of the utility model is that the lithium bromide absorption refrigeration system 10 cools down the compressed air, makes full use of the principle of thermal expansion and contraction of the air, reduces the power consumption of the compressor, and performs secondary compression on the compressed air, improving the The pressure of the compressed air entering the combustion chamber makes the flue gas at the inlet of the gas turbine 13 have a higher pressure, which improves the expansion work of the turbine;

The further improvement of the utility model is that the natural gas and the compressed air from the outlet of the second compressor 11 are input into the second regenerator 6 together, so that the high-temperature molten salt releases heat to it, reducing the heat loss of the combustion chamber, And make full use of solar energy to reduce the consumption of natural gas fuel, which is beneficial to energy saving and emission reduction;

The further improvement of the utility model is that for the high-temperature exhaust of the gas turbine, the Kalina cycle is used as the bottom cycle to make full use of the waste heat of the flue gas. The Kalina cycle uses ammonia water as the working medium, and has the advantages of repeated utilization and low cost;

The further improvement of the utility model is that the high-temperature molten salt in the tower solar system 100 is used to heat the ammonia-rich steam at the outlet of the separator 16, and the inlet temperature of the ammonia gas turbine 18 is improved, so that the ammonia gas turbine 18 can be operated efficiently. Increased functional capacity;

The further improvement of the utility model is that the ammonia gas turbine 18 is provided with intermediate steam supplementation, and the steam intake flow rate of the supplementary steam valve is controlled by adjusting the valve space of the second regulating valve, which is used to adjust the ammonia gas turbine 18. Work ability.

Example:

A gas turbine combined cycle power generation system in a distributed energy environment according to an embodiment of the utility model includes three parts, namely a tower solar power generation system 100, a gas turbine power generation system 200, and a Kalina cycle power generation system 300.

In the tower solar power generation system 100, the solar energy generated during the day is reflected by the mirror field 2, and the molten salt absorbs heat energy in the heat absorber 3, and the temperature of the molten salt rises in the heat absorber, and a part of the high-temperature molten salt enters the The first regenerator 5 releases heat to the ammonia-rich steam in the regenerator to convert it into superheated steam. The tower solar power generation system 100 adopts a bypass control method, and a part of the high-temperature molten salt enters the second regenerator 6 through the first regulating valve 4. By controlling the valve opening of the first regulating valve 4, the molten salt is controlled to The heat release in the second regenerator 6, when the opening degree of the first regulating valve 4 increases, means that the heat release in the second regenerator 6 increases, so as to control the heating degree of compressed air and natural gas fuel.

In the gas turbine power generation system 200, the air is first sent into the first compressor 9, and the compressor consumes power to compress the air at normal temperature and pressure into high-pressure air; further, in order to further compress the high-pressure air, the high-pressure Therefore, the high-pressure air is sent into the lithium bromide refrigeration system 10, and the high-pressure compressed air is cooled in the lithium bromide refrigeration system 10. Due to the thermal expansion and contraction of the air, the temperature and pressure of the compressed air are all reduced; further, cooling The decompressed compressed air is sent to the second compressor 11, the pressure of the compressed air is raised again, and the compressed air and fuel with the pressure raised again are sent to the second regenerator 6, and are transferred from the third part of the tower The high-temperature molten salt heating in the solar system preheats the compressed air and fuel, reducing the heat loss inside the combustion chamber 12. The high-temperature and high-pressure flue gas generated in the combustion chamber 12 is first sent to the gas turbine 13, and the gas turbine During the process, the thermal energy of the high-temperature and high-pressure flue gas is converted into mechanical energy, and the mechanical energy is converted into electrical energy in the first generator 14 .

The Kalina cycle power generation system 300 adopts a multi-stage heat recovery method, and the Kalina cycle power generation system 300 mainly includes an evaporator 15, a separator 16, a second regulating valve 17, an ammonia turbine 18, and a second generator 19 , the third regenerator 20, the throttle valve 21, the mixer 22, the condenser 23, the working medium pump 24 and other parts; wherein, the exhaust gas from the gas turbine 13 in the gas turbine power generation system 200 is sent into the evaporator Release heat to the basic ammonia solution, the basic ammonia solution enters the first evaporator, absorbs the waste heat of the flue gas, enters the two-phase region from the subcooling zone, and the heated ammonia solution enters the separator for separation, and separates saturated ammonia-rich vapor and lean ammonia solution; the saturated ammonia-rich steam enters the first regenerator 5, and the high-temperature molten salt releases heat energy to the saturated ammonia-rich steam, making its temperature rise again and transforming into superheated steam, which then enters the ammonia permeation In flat 18, the work is done by expansion, and the ammonia gas turbine adopts the way of steam inlet at the intermediate stage. By controlling the opening degree of the second regulating valve 17, the flow rate of supplementary steam entering the ammonia gas turbine is adjusted. The ammonia gas turbine 18 and the second generator 19 adopts a coaxial arrangement, and the high-speed rotating rotor drives the generator to generate electricity, and the ammonia-rich steam that has completed expansion and work in the ammonia gas turbine 18 enters the mixer 22 .

The saturated ammonia-lean solution at the outlet of the lower end of the separator 16 releases a part of heat energy in the third regenerator 20; The back pressure is the same; it is mixed with the rich ammonia vapor in the mixer 22 at equal pressure to produce a basic ammonia solution; the mixed basic ammonia solution enters the condenser and is condensed into a supercooled liquid by cooling water; under the action of the working medium pump 24, The pressure is increased, and the basic ammonia solution is sent to the third regenerator 20 to absorb the heat energy of the high-temperature lean ammonia solution, completing the thermodynamic cycle of the entire high-temperature Kalina.

In summary, the utility model discloses a gas turbine combined cycle power generation system in a distributed energy environment, which includes a tower solar power generation system, a gas turbine power generation system, and a Kalina cycle power generation system. The fuel in front of the room, the compressed air and the ammonia-rich steam in front of the ammonia turbine are heated, which reduces the consumption of natural gas fuel, and makes full use of clean solar energy resources and low-cost ammonia water working medium. In addition, the Kalina cycle power generation system is used to recover waste heat from the exhaust gas of the gas turbine, which avoids the waste of high-quality heat energy. In addition, the system of the present invention has multiple forms, making the system small and flexible.

Claims (5)

1. The gas turbine combined cycle power generation system under the distributed energy environment is characterized by comprising a tower type solar power generation system (100), a gas turbine power generation system (200) and a Kalina cycle power generation system (300);

the Kalina cycle power generation system (300) recovers waste heat of exhaust gas of a gas turbine, converts heat energy into mechanical energy and drives a second generator (19) to generate power, the tower type solar power generation system (100) is used for increasing heat of the Kalina cycle power generation system (300), and the gas turbine power generation system (200) is used for receiving the heat transmitted by the tower type solar power generation system (100) to generate power;

the tower type solar power generation system (100), the gas turbine power generation system (200) and the Kalina cycle power generation system (300) are coupled with each other;

the Kalina cycle power generation system (300) comprises an evaporator (15), the evaporator (15) utilizes high-temperature exhaust of a gas turbine to carry out heat exchange to preheat basic ammonia water solution subjected to heat exchange by a third heat regenerator (20) to obtain basic ammonia water solution in a two-phase region and output the basic ammonia water solution to a separator (16), the separator (16) separates the basic ammonia water solution in the two-phase region and outputs saturated rich ammonia steam and saturated poor ammonia solution, the saturated rich ammonia steam is converted into superheated steam through a first heat regenerator (5), and the superheated steam converts heat energy into mechanical energy through an ammonia turbine (18) to drive a second generator (19) to generate electricity.

2. A gas turbine combined cycle power generation system in a distributed energy environment according to claim 1, characterized in that the tower solar power generation system (100) comprises a mirror field (2), said mirror field (2) is used for reflecting solar energy (1) to a heat absorber (3), the inlet of said heat absorber (3) is communicated with the outlet of a molten salt pump (8); the outlet of the heat absorber (3) is communicated with the inlet of a heat source pipeline of the first heat regenerator (5), the inlet of the heat source pipeline of the first heat regenerator (5) is communicated with the inlet of the molten salt tank (7) through the heat source pipeline of the second heat regenerator (6), and the outlet of the molten salt tank (7) is connected with the inlet of the molten salt pump (8).

3. The gas turbine combined cycle power generation system in a distributed energy environment according to claim 1, wherein the gas turbine power generation system (200) includes a first compressor (9) for providing compressed air, a compressed air outlet of the first compressor (9) is connected to a lithium bromide refrigeration system (10), the lithium bromide refrigeration system (10) is used for cooling the compressed air exiting from the first compressor (9), the lithium bromide refrigeration system (10) is connected to the second regenerator (6) through the second compressor (11), the second regenerator (6) preheats natural gas and the compressed air exiting from the second compressor (11), the preheated natural gas and the compressed air are combusted in the combustion chamber (12), and the generated flue gas is worked in the gas turbine (13) to drive the first generator (14) to generate power.

4. The gas turbine combined cycle power generation system under the distributed energy environment according to claim 1, wherein the lean ammonia solution is connected to a first mixer (22) through a third heat regenerator (20), the first mixer (22) is configured to perform isobaric mixing on the dead steam output by the ammonia turbine (18) and the saturated lean ammonia solution after depressurization, and output a basic ammonia solution mixed working medium, an output end of the mixer (22) is connected to a condenser (23), and a working medium pump (24) is configured to pressurize the basic ammonia solution output by the condenser (23) and input the pressurized basic ammonia solution into the third heat regenerator (20).

5. The gas turbine combined cycle power generation system in a distributed energy environment according to claim 1, wherein a throttle valve (21) for throttling and depressurizing the high-pressure ammonia-lean solution is arranged between the third regenerator (20) and the first mixer (22).

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