CN114592935A - Gas turbine-double-pressure Kalina combined cycle power generation system and method - Google Patents
Gas turbine-double-pressure Kalina combined cycle power generation system and method Download PDFInfo
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- CN114592935A CN114592935A CN202210328956.9A CN202210328956A CN114592935A CN 114592935 A CN114592935 A CN 114592935A CN 202210328956 A CN202210328956 A CN 202210328956A CN 114592935 A CN114592935 A CN 114592935A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
- F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
- F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
- F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/06—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using mixtures of different fluids
- F01K25/065—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using mixtures of different fluids with an absorption fluid remaining at least partly in the liquid state, e.g. water for ammonia
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C6/00—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas- turbine plants for special use
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C6/00—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas- turbine plants for special use
- F02C6/18—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas- turbine plants for special use using the waste heat of gas-turbine plants outside the plants themselves, e.g. gas-turbine power heat plants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/22—Fuel supply systems
- F02C7/224—Heating fuel before feeding to the burner
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G6/00—Devices for producing mechanical power from solar energy
- F03G6/06—Devices for producing mechanical power from solar energy with solar energy concentrating means
- F03G6/064—Devices for producing mechanical power from solar energy with solar energy concentrating means having a gas turbine cycle, i.e. compressor and gas turbine combination
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G6/00—Devices for producing mechanical power from solar energy
- F03G6/06—Devices for producing mechanical power from solar energy with solar energy concentrating means
- F03G6/065—Devices for producing mechanical power from solar energy with solar energy concentrating means having a Rankine cycle
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/46—Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines
Abstract
The invention discloses a gas turbine-double-pressure Kalina combined cycle power generation system and a method, wherein the system comprises a gas turbine power generation system module, a double-pressure Kalina combined cycle power generation system module and a tower type solar heat supply module; the gas turbine power generation system module comprises a gas turbine, and the gas turbine drives a first generator to generate power; the double-pressure Kalina cycle power generation system module comprises two connected single-pressure Kalina cycles, wherein the high-pressure Kalina cycle is connected with a flue gas outlet of the first heat regenerator to provide a first heat source to drive the first ammonia gas to generate power by a turbine; the low-pressure Kalina cycle is connected with the tower type solar heat supply module to provide a second heat source to drive a second ammonia gas turbine to generate electricity. High-temperature flue gas generated by natural gas combustion of the gas turbine power generation system module and heat energy generated by the tower type solar heat supply module are absorbed by the double-pressure Kalina circulating power generation system to be converted into high-quality electric energy, clean solar energy resources are fully utilized, and ammonia water working media with low cost are fully utilized.
Description
Technical Field
The invention belongs to the field of combined cycle power generation systems, and particularly relates to a gas turbine-double-pressure Kalina combined cycle power generation system and method.
Background
The energy can be divided into fossil energy and non-fossil energy according to the cause, wherein the fossil energy, i.e. the energy (such as coal, oil and natural gas) formed after the various animal and plant remains left on the earth in ancient times are buried under the stratum due to factors such as crustal movement and the like and are evolved for over ten thousand years or more, and the non-fossil energy comprises the current new energy and renewable energy. In recent years, global energy crisis and environmental problems caused by exploitation and utilization of fossil energy are becoming more prominent, and a third energy transformation starting from development of new energy and reduction of fossil energy percentage has been developed around the world. However, non-fossil energy is still far from supporting energy consumption, and the transformation of energy structure requires a long transition period, so that fossil energy remains as main energy in the next decade.
Most of fossil energy is applied to the industrial field, and due to the problems of immature industrial development technology and the like, a large amount of waste heat resources in the coal and power industry cannot be effectively utilized, and the energy accounts for 70% of the total energy consumption, so that huge energy waste is caused; the recyclable waste heat resource accounts for 60% of the total resource, so that the recycling of industrial waste heat is beneficial to improving the energy utilization rate, relieving the energy crisis and further promoting the development of an energy cleaning low-carbon development mode. Taking a thermal power plant as an example, flue gas, slag, cooling water and the like discharged by a boiler take away much heat, so that the total heat of the thermal power plant is about half of the total heat, the waste heat energy is recycled, the problem of energy waste is effectively relieved, and more output products are created.
Disclosure of Invention
In order to solve the problem of energy waste, the invention provides a gas turbine-double-pressure Kalina combined cycle power generation system and a method, which fully utilize waste heat of the gas turbine and a clean heat source of solar energy and are a combined cycle power generation system for coupling the gas turbine, the solar energy power generation and the double-pressure Kalina.
In order to achieve the purpose, the invention adopts the following technical scheme:
a gas turbine-double-pressure Kalina combined cycle power generation system comprises a gas turbine power generation system module, a double-pressure Kalina combined cycle power generation system module and a tower type solar heat supply module;
the gas turbine power generation system module comprises a first regenerator, a combustion chamber, a gas turbine and a first generator, wherein the gas turbine drives the first generator to generate power, and an exhaust port of the gas turbine is connected with the first regenerator and used for heating compressed air and natural gas; the first heat regenerator is connected with the combustion chamber, and a gas outlet of the combustion chamber is connected with a gas inlet of the gas turbine;
the double-pressure Kalina cycle power generation system module comprises two connected single-pressure Kalina cycles, wherein the high-pressure Kalina cycle is connected with a flue gas outlet of the first heat regenerator to provide a first heat source to drive the first ammonia turbine to generate power; the low-pressure Kalina circulation is connected with the tower type solar heat supply module to provide a second heat source to drive a second ammonia turbine to generate electricity.
As a further improvement of the invention, the gas turbine power generation system module further comprises a first gas compressor, an intercooler and a second gas compressor; the first air compressor, the second air compressor, the gas turbine and the first generator are coaxially arranged; the outlet of the first compressor is connected with the inlet of the second compressor through the intercooler, and the outlet of the second compressor and the natural gas pipeline are both connected with the inlet of the first regenerator.
As a further improvement of the present invention, the high pressure Kalina cycle comprises a first superheater, a first evaporator, a first separator, a first ammonia turbine, and a third regenerator; the gas inlet of the first superheater is connected with the flue gas outlet of the first superheater; a gas outlet of the first superheater is connected with a gas inlet of the first evaporator; a working medium inlet of the first evaporator is connected with a working medium outlet of the third heat regenerator, a working medium outlet of the first evaporator is connected with an inlet of the first separator, a gas outlet of the first separator is connected with a gas inlet of the first superheater, and a gas outlet of the first superheater is connected with a gas inlet of the first ammonia turbine; and the liquid outlet of the first separator is connected with a first ammonia turbine, and the liquid outlet of the first ammonia turbine and the liquid outlet of the third regenerator are joined and then circularly connected with the low-pressure Kalina.
As a further improvement of the invention, a first bypass pipeline is further arranged at two ends of the first ammonia turbine, and a first throttling valve is arranged on the first bypass pipeline.
As a further improvement of the invention, the outlet of the first ammonia turbine and the liquid outlet of the third regenerator are connected to a first mixer, and the first mixer is connected with a second mixer of the low-pressure Kalina cycle.
As a further improvement of the invention, the low-pressure Kalina cycle comprises a condenser, a working medium liquid storage tank, a fourth heat regenerator and a second separator; an outlet of the second mixer is connected to the condenser, and a working medium outlet of the condenser after heat exchange is connected to the working medium liquid storage tank;
an outlet of the working medium liquid storage tank is connected with a working medium inlet of the third heat regenerator;
the other outlet of the working medium liquid storage tank is connected with a working medium inlet of a fourth heat regenerator, a working medium outlet of the fourth heat regenerator is connected to a second separator after primary heat exchange with the tower type solar heat supply module, a liquid outlet of the second separator is connected with a liquid inlet of the fourth heat regenerator, and a liquid outlet of the fourth heat regenerator is connected to a second mixer; and a gas outlet of the second separator is connected with an inlet of a second ammonia turbine after secondary heat exchange with the tower type solar heat supply module, and an outlet of the second ammonia turbine is connected to the second mixer.
As a further improvement of the invention, a second bypass pipeline is further arranged at two ends of the second ammonia turbine, and a second throttling valve is arranged on the second bypass pipeline.
As a further improvement of the invention, two outlets of the working medium liquid storage tank are respectively provided with a control valve and a second booster pump.
As a further improvement of the invention, the tower type solar heat supply module comprises a mirror field, a heat absorber, a third regulating valve, a second mixing valve, a lava tank and a molten salt pump;
the mirror field reflects solar energy to the heat absorber; the inlet of the heat absorber is communicated with the outlet of the molten salt tank through the molten salt pump; the outlet of the heat absorber is divided into two parts, one part is connected with the inlet entering the second superheater, the other part is mixed with the outlet of the second superheater to a second mixing valve after passing through a control valve, the second mixing valve is connected with the inlet of a second evaporator, and the outlet of the second evaporator is connected to the inlet of the molten salt tank;
the second evaporator and the fourth heat regenerator are connected for primary heat exchange, and the second superheater and the second separator are used for secondary heat exchange.
A method of controlling a gas turbine-dual pressure Kalina combined cycle power generation system, comprising:
in the gas turbine power generation system module, natural gas and compressed air exchange heat through a first heat regenerator and then are combusted in a combustion chamber to drive a gas turbine to do work and drive a first generator to generate power;
flue gas of the first heat regenerator provides a first heat source for high-pressure Kalina circulation in the double-pressure Kalina circulation power generation system module to drive a first ammonia turbine to generate power;
the tower type solar heat supply module provides a second heat source for the low-pressure Kalina cycle to drive a second ammonia turbine to generate electricity;
and mixing the working media subjected to high-pressure Kalina circulation and low-pressure Kalina circulation heat exchange for recycling.
Compared with the prior art, the invention has the following beneficial effects:
the system can realize energy conservation and emission reduction, couples the gas turbine power generation system module, the double-pressure Kalina cycle power generation system module and the tower type solar heat supply module, fully utilizes clean solar energy resources and low-cost ammonia water working medium, and recovers waste heat of the exhaust gas of the gas turbine by adopting the Kalina cycle power generation system, thereby avoiding waste of high-quality heat energy. In addition, the system of the invention has a diversified form, so that the system is small and flexible, and compared with the traditional gas and steam combined cycle, the system of the invention reduces the temperature of the compressed air and reduces the power consumption of the compressor. The high-temperature flue gas generated by natural gas combustion of the gas turbine power generation system module and the heat energy generated by the tower type solar heat supply module are absorbed by the double-pressure Kalina circulating power generation system, so that the low-quality waste heat is converted into high-quality electric energy, and clean solar energy resources and ammonia water working media with low cost are fully utilized. In addition, the system of the invention performs the coupling of distributed energy sources, and displays the diversified characteristics of the energy sources to a certain extent.
Further, solar energy is adopted to provide stable energy input for the gas and steam combined cycle, so that on one hand, fuel is saved, and on the other hand, energy conservation and emission reduction are realized. Specifically, the saturated ammonia-rich steam is heated by solar energy, so that the heat input into a Kalina cycle power generation system is increased, the inlet air temperature entering an ammonia turbine is increased, and the work capacity of the steam turbine is improved. Besides, the molten salt is adopted to preheat the fuel and the compressed air in front of the combustion chamber, so that the heat loss of the combustion chamber is reduced, and the fuel consumption is reduced.
Furthermore, the double-pressure Kalina circulating power generation system module is adopted, compared with the traditional single-pressure Kalina circulating power generation system, a turbine, a separator, an evaporator, a working medium pump and the like are additionally arranged, the waste heat of the solar energy is fully utilized, and the acting capacity of the Kalina circulating power generation system is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art are briefly introduced below; it is obvious that the drawings in the following description are some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic diagram of a gas turbine-dual pressure Kalina combined cycle power generation system according to an embodiment of the present invention;
in the figure, 100, a gas turbine power generation system module; 200. a dual-pressure Kalina cycle power generation system module; 300. tower type solar heat supply module
1. A first compressor; 2. an intercooler; 3. a second compressor; 4. a first heat regenerator; 5. a combustion chamber; 6. a gas turbine; 7. a first generator;
8. a first superheater; 9. a first evaporator; 10. a first separator; 11. a first ammonia gas turbine; 12. a first throttle valve; 13. a third regenerator; 14. a first mixer; 15. a second mixer; 16. a condenser; 17. a working medium liquid storage tank; 18. a first regulating valve; 19. a first booster pump; 20. a fourth regenerator; 21. a second evaporator; 22. a second separator; 23. a second superheater; 24. a second throttle valve; 25. a second ammonia gas turbine; 26. a second control valve; 27. a second booster pump;
27. a mirror field; 28. a heat sink; 29. a third regulating valve; 30. a second mixing valve; 31. a lava tank; 32. a molten salt pump;
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, a schematic diagram of a gas turbine-dual pressure Kalina combined cycle power generation system according to an embodiment of the present invention includes 3 main components, such as a gas turbine power generation system module 100, a dual pressure Kalina cycle power generation system module 200, and a tower solar heat supply module 300.
In an embodiment of the present invention, the first part of the gas turbine power generation system module 100 includes:
the system comprises a gas turbine power generation system module 100, a double-pressure Kalina cycle power generation system module 200 and a tower type solar heat supply module 300;
the gas turbine power generation system module 100 comprises a first heat regenerator 4, a combustion chamber 5, a gas turbine 6 and a first generator 7, wherein the gas turbine 6 drives the first generator 7 to generate power, and an exhaust port of the gas turbine 6 is connected with the first heat regenerator 4 and used for heating compressed air and natural gas; the first heat regenerator 4 is connected with a combustion chamber 5, and a gas outlet of the combustion chamber 5 is connected with a gas inlet of the gas turbine 6;
the double-pressure Kalina cycle power generation system module 200 comprises two connected single-pressure Kalina cycles, wherein the high-pressure Kalina cycle is connected with a flue gas outlet of the first heat regenerator 4 to provide a first heat source to drive the first ammonia turbine 11 to generate power; the low-pressure Kalina cycle is connected with the tower type solar heating module 300 to provide a second heat source to drive the second ammonia turbine 25 to generate electricity.
The system also comprises a first gas compressor 1, an intercooler 2 and a second gas compressor 3; the first air compressor 1, the second air compressor 3, the gas turbine 6 and the first generator 7 are coaxially arranged; the outlet of the first compressor 1 is connected with the inlet of the second compressor 3 through the intercooler 2, and the outlet of the second compressor 3 and the natural gas pipeline are both connected with the inlet of the first regenerator 4.
The functions of each part are as follows:
a first compressor 1 for inputting and compressing air and outputting primary pressurized air; the intercooler 2 is used for cooling the heat of the air at the outlet of the first compressor, so that the temperature of the air is reduced, and the compression power consumption of the second compressor is reduced. And the first heat regenerator 4 is used for heating the natural gas at the inlet of the combustion chamber so as to increase the inlet temperature of the natural gas in the combustion chamber and reduce heat loss. And the gas turbine is used for inputting the smoke output by the combustion chamber and performing expansion work so as to drive the generator to generate power.
The second compressor 3 is provided with an inlet and an outlet and is used for secondary compression of compressed air, and the compressor adopts a multi-stage centrifugal compressor and has the advantages of high pressure ratio and high efficiency; the secondary compressed air enters the first heat regenerator, the high-temperature exhaust gas of the gas turbine 6 heats the compressed air and the natural gas, so that the compressed air and the natural gas have higher temperature when being sent into the combustion chamber 5, the heat loss entering the combustion chamber is reduced, the flue gas at the outlet of the first heat regenerator 4 still has higher temperature, and the flue gas is sent into the double-pressure Kalina cycle power generation system module.
In the embodiment of the present invention, the second partial dual-pressure Kalina cycle power generation system module 200 is composed of two single-pressure Kalina cycles, which are a high-pressure Kalina cycle and a low-pressure Kalina cycle, respectively.
The high-pressure Kalina cycle comprises a first superheater 8, a first evaporator 9, a first separator 10, a first ammonia turbine 11 and a third regenerator 13; the gas inlet of the first superheater 8 is connected with the flue gas outlet of the first reheater 4; the gas outlet of the first superheater 8 is connected with the gas inlet of the first evaporator 9; a working medium inlet of the first evaporator 9 is connected with a working medium outlet of the third heat regenerator 13, a working medium outlet of the first evaporator 9 is connected with an inlet of the first separator 10, a gas outlet of the first separator 10 is connected with a gas inlet of the first superheater 8, and a gas outlet of the first superheater 8 is connected with a gas inlet of the first ammonia turbine 11; the liquid outlet of the first separator 10 is connected with a first ammonia turbine 11, and the liquid outlet of the first ammonia turbine 11 and the liquid outlet of a third regenerator 13 are joined and then circularly connected with the low-pressure Kalina.
For the sake of control, a first bypass line is further provided at both ends of the first ammonia turbine 11, and a first throttle valve 12 is provided in the first bypass line. The outlet of the first ammonia turbine 11 and the liquid outlet of the third regenerator 13 are connected to a first mixer 14, and the first mixer 14 is connected to a second mixer 15 of the low-pressure Kalina cycle. The connection to the low-pressure Kalina cycle is carried out via a second mixer 15.
In a high-pressure Kalina cycle, a basic ammonia solution absorbs the residual heat of flue gas in a first evaporator 9, the temperature is raised from a supercooling zone to a two-phase zone, the ammonia solution in the two-phase zone is separated into a saturated ammonia-rich steam dryness 1 and a saturated ammonia-poor solution dryness 0 in a separator 10, the saturated ammonia-rich steam is heated into superheated ammonia steam in a first superheater 8 and is expanded in a turbine to do work, exhaust steam of a first ammonia turbine 11 and the ammonia-poor solution are mixed into the basic ammonia solution in a first mixer 14, and the saturated ammonia-poor solution releases heat to the basic ammonia solution in a third regenerator 13.
The low-pressure Kalina cycle comprises a condenser 16, a working medium liquid storage tank 17, a fourth heat regenerator 20 and a second separator 22; an outlet of the second mixer 15 is connected to a condenser 16, and a working medium outlet of the condenser 16 after heat exchange is connected to a working medium liquid storage tank 17; an outlet of the working medium liquid storage tank 17 is connected with a working medium inlet of the third heat regenerator 13; the other outlet of the working medium liquid storage tank 17 is connected with a working medium inlet of a fourth heat regenerator 20, a working medium outlet of the fourth heat regenerator 20 is connected to a second separator 22 after primary heat exchange with the tower type solar heat supply module 300, a liquid outlet of the second separator 22 is connected with a liquid inlet of the fourth heat regenerator 20, and a liquid outlet of the fourth heat regenerator 20 is connected to a second mixer 15; the gas outlet of the second separator 22 is subjected to secondary heat exchange with the tower solar heating module 300 and then connected with the inlet of the second ammonia turbine 25, and the outlet of the second ammonia turbine 25 is connected to the second mixer 15.
Wherein, a second bypass pipeline is further arranged at two ends of the second ammonia turbine 25, and a second throttle valve 24 is arranged on the second bypass pipeline. And two outlets of the working medium liquid storage tank 17 are provided with a control valve and a second booster pump.
In the low-pressure Kalina cycle, the basic ammonia water solution in the working medium tank 17 is pressurized by the first booster pump under the control of the first regulating valve, the working medium passes through the fourth heat regenerator 20, the second evaporator 21, the second separator 22 and the second superheater 23 in sequence, the working medium absorbs the heat energy of solar energy in the second evaporator, the basic ammonia water solution is heated from the supercooling zone to the two-phase zone, the saturated ammonia-rich steam dryness 1 and the saturated ammonia-poor solution dryness 0 are separated in the second separator 22, the saturated ammonia-rich steam is heated into superheated ammonia steam in the second superheater 23, the exhaust steam is mixed into the basic ammonia water solution in the second mixer 15, the incompletely condensed basic ammonia water working medium is condensed into the supercooled basic ammonia water solution by cooling water in the condenser 16, further, the supercooled basic ammonia water solution is sent into the working medium storage tank 17, under the action of the first booster pump 19 and the second booster pump 27, the high pressure Kalina cycle and the low pressure Kalina cycle were completed separately.
The double-pressure Kalina cycle power generation system module 200 adopts ammonia water as working fluid, flue gas of a gas turbine enters the double-pressure Kalina cycle power generation system module after heat is released in the first heat exchanger 4, and heat is released in the system to the working fluid in the first superheater 8 and the first evaporator 9.
The first superheater 8 heats the saturated ammonia-rich steam into superheated steam, so that the work capacity of the ammonia steam entering the first ammonia turbine 11 is improved;
the third heat regenerator 13 is used for recovering the heat of the ammonia-poor solution at the outlet of the first separator 10, improving the heat efficiency of the cycle and reducing the heat loss;
and the second ammonia gas turbine 25 is used for driving a generator, so that the output power of the system is maximized, and the work capacity of the system is increased.
In the embodiment of the present invention, the tower solar heat supply module 300 includes a mirror field 27, a heat absorber 28, a third regulating valve 29, a second mixing valve 30, a molten rock tank 31, and a molten salt pump 32; a mirror field 27 reflects solar energy to said absorber 28; the inlet of the heat absorber 28 is communicated with the outlet of the molten salt tank 31 through the molten salt pump 32; the outlet of the heat absorber 28 is divided into two parts, one part is connected with the inlet of the second superheater 23, the other part is mixed with the outlet of the second superheater 23 to a second mixing valve 30 after passing through a control valve 29, the second mixing valve 30 is connected with the inlet of the second evaporator 21, and the outlet of the second evaporator 21 is connected to the inlet of the molten salt tank 31;
the second evaporator 21 and the fourth regenerator 20 are connected for primary heat exchange, and the second superheater 23 and the second separator 22 are used for secondary heat exchange.
In the tower-type solar power generation system 300, solar energy generated in daytime absorbs heat energy in the molten salt in the heat absorber 28 through the reflection action of the mirror field 27, the temperature of the molten salt in the heat absorber rises, a part of the high-temperature molten salt enters the second superheater 23, and heat is released in the second superheater to the ammonia-rich steam, so that the ammonia-rich steam is converted into superheated steam. The tower solar power generation system adopts a bypass control method, a part of high-temperature molten salt enters the second regenerator 6 through the first regulating valve 4, the heat release amount of the molten salt in the second evaporator 21 is controlled by controlling the valve opening degree of the third regulating valve 29, and when the valve opening degree of the third regulating valve 29 is increased, the heat release amount in the second evaporator 21 is increased. The tower type solar power generation system fully utilizes the solar waste heat, so that the solar waste heat is converted into high-quality electric energy, and the sustainable development of energy sources is facilitated.
A tower type solar power generation system is adopted and used for heating working fluid in a second evaporator 21 and a second superheater 23 in a low-pressure Kalina cycle, clean heat energy generated by solar energy is fully utilized, and low-quality heat energy is converted into high-quality electric energy.
The specific functions of each part are as follows:
the mirror field 27 is used for reflecting solar energy to the heat absorber;
the inlet of the heat absorber 28 is communicated with the outlet of the molten salt tank 31 through the molten salt pump 32;
the flow of the high-temperature molten salt at the outlet of the heat absorber 28 is regulated by the control valve 29, and the high-temperature molten salt enters the second superheater 23 to heat the saturated ammonia-rich steam, so that the saturated ammonia-rich steam is heated into superheated ammonia steam, and the working capacity of the second ammonia turbine is provided.
The invention has the further improvement that the Kalina cycle power generation system is heated by the heat of the solar energy, clean energy is fully utilized, and the invention is beneficial to the development of sustainable energy.
The invention also provides a control method of the gas turbine-double-pressure Kalina combined cycle power generation system, which comprises the following steps:
in the gas turbine power generation system module 100, natural gas and compressed air exchange heat through the first heat regenerator 4 and then are combusted in the combustion chamber 5 to drive the gas turbine 6 to do work and drive the first generator 7 to generate power;
the flue gas of the first heat regenerator 4 provides a first heat source for the high-pressure Kalina cycle in the dual-pressure Kalina cycle power generation system module 200 to drive the first ammonia turbine 11 to generate power;
the tower type solar heat supply module 300 provides a second heat source for the low-pressure Kalina cycle to drive the second ammonia turbine 25 to generate electricity;
and mixing the working media subjected to high-pressure Kalina circulation and low-pressure Kalina circulation heat exchange for recycling.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (10)
1. A gas turbine-double pressure Kalina combined cycle power generation system is characterized by comprising a gas turbine power generation system module (100), a double pressure Kalina cycle power generation system module (200) and a tower type solar heat supply module (300);
the gas turbine power generation system module (100) comprises a first heat regenerator (4), a combustion chamber (5), a gas turbine (6) and a first generator (7), wherein the gas turbine (6) drives the first generator (7) to generate power, and an exhaust port of the gas turbine (6) is connected with the first heat regenerator (4) and used for heating compressed air and natural gas; the first heat regenerator (4) is connected with a combustion chamber (5), and a gas outlet of the combustion chamber (5) is connected with a gas inlet of the gas turbine (6);
the double-pressure Kalina cycle power generation system module (200) comprises two connected single-pressure Kalina cycles, wherein the high-pressure Kalina cycle is connected with a flue gas outlet of the first heat regenerator (4) to provide a first heat source to drive the first ammonia turbine (11) to generate power; the low-pressure Kalina cycle is connected with the tower type solar heating module (300) to provide a second heat source to drive a second ammonia turbine (25) to generate electricity.
2. A gas turbine-dual pressure Kalina combined cycle power generation system according to claim 1, wherein the gas turbine power generation system module (100) further comprises a first compressor (1), an intercooler (2), a second compressor (3); the first air compressor (1), the second air compressor (3) and the first generator (7) are coaxially arranged; the outlet of the first compressor (1) is connected with the inlet of the second compressor (3) through the intercooler (2), and the outlet of the second compressor (3) and the natural gas pipeline are both connected with the inlet of the first heat regenerator (4).
3. A gas turbine-dual pressure Kalina combined cycle power generation system according to claim 1, wherein the high pressure Kalina cycle comprises a first superheater (8), a first evaporator (9), a first separator (10), a first ammonia turbine (11) and a third regenerator (13); the gas inlet of the first superheater (8) is connected with the flue gas outlet of the first superheater (4); the gas outlet of the first superheater (8) is connected with the gas inlet of the first evaporator (9); a working medium inlet of the first evaporator (9) is connected with a working medium outlet of the third heat regenerator (13), a working medium outlet of the first evaporator (9) is connected with an inlet of the first separator (10), a gas outlet of the first separator (10) is connected with a gas inlet of the first superheater (8), and a gas outlet of the first superheater (8) is connected with a gas inlet of the first ammonia turbine (11); the liquid outlet of the first separator (10) is connected with a first ammonia turbine (11), and the liquid outlet of the first ammonia turbine (11) and the liquid outlet of the third regenerator (13) are joined and then circularly connected with the low-pressure Kalina.
4. A gas turbine-dual pressure Kalina combined cycle power generation system according to claim 3, wherein a first bypass pipe is further provided at both ends of the first ammonia turbine (11), and a first throttle valve (12) is provided on the first bypass pipe.
5. A gas turbine-dual pressure Kalina combined cycle power generation system according to claim 3, wherein the outlet of the first ammonia turbine (11) and the liquid outlet of the third regenerator (13) are connected to a first mixer (14), and the first mixer (14) is connected to a second mixer (15) of the low pressure Kalina cycle.
6. A gas turbine-dual pressure Kalina combined cycle power generation system according to claim 5, characterized in that the low pressure Kalina cycle comprises a condenser (16), a working medium reservoir (17), a fourth regenerator (20) and a second separator (22); an outlet of the second mixer (15) is connected to a condenser (16), and a working medium outlet of the condenser (16) after heat exchange is connected to a working medium liquid storage tank (17);
an outlet of the working medium liquid storage tank (17) is connected with a working medium inlet of the third heat regenerator (13);
the other outlet of the working medium liquid storage tank (17) is connected with a working medium inlet of a fourth heat regenerator (20), a working medium outlet of the fourth heat regenerator (20) is connected to a second separator (22) after primary heat exchange with the tower type solar heat supply module (300), a liquid outlet of the second separator (22) is connected with a liquid inlet of the fourth heat regenerator (20), and a liquid outlet of the fourth heat regenerator (20) is connected to a second mixer (15); and a gas outlet of the second separator (22) is connected with an inlet of a second ammonia turbine (25) after secondary heat exchange with the tower type solar heat supply module (300), and an outlet of the second ammonia turbine (25) is connected to the second mixer (15).
7. A gas turbine-dual pressure Kalina combined cycle power generation system according to claim 6, characterized in that a second bypass pipe is further provided at both ends of the second ammonia turbine (25), and a second throttle valve (24) is provided on the second bypass pipe.
8. The gas turbine-dual pressure Kalina combined cycle power generation system as claimed in claim 6, wherein a control valve and a second booster pump are provided at both outlets of the working medium storage tank (17).
9. A gas turbine-dual pressure Kalina combined cycle power generation system according to claim 6, characterized in that the tower solar heating module (300) comprises a mirror field (27), a heat absorber (28), a third regulating valve (29), a second mixing valve (30), a lava pot (31) and a molten salt pump (32);
the mirror field (27) reflecting solar energy to the heat absorber (28); the inlet of the heat absorber (28) is communicated with the outlet of the molten salt tank (31) through the molten salt pump (32); the outlet of the heat absorber (28) is divided into two parts, one part is connected with the inlet of the second superheater (23), the other part is mixed with the outlet of the second superheater (23) to a second mixing valve (30) after passing through a control valve (29), the second mixing valve (30) is connected with the inlet of a second evaporator (21), and the outlet of the second evaporator (21) is connected to the inlet of the molten salt tank (31);
the second evaporator (21) is connected with the fourth heat regenerator (20) for primary heat exchange, and the second superheater (23) and the second separator (22) are used for secondary heat exchange.
10. A method of controlling a gas turbine-dual pressure Kalina combined cycle power generation system as set forth in claim 6, comprising:
in the gas turbine power generation system module (100), natural gas and compressed air exchange heat through a first heat regenerator (4) and then are combusted in a combustion chamber (5) to drive a gas turbine (6) to do work to drive a first generator (7) to generate power;
flue gas of the first heat regenerator (4) provides a first heat source for a high-pressure Kalina cycle in the dual-pressure Kalina cycle power generation system module (200) to drive a first ammonia turbine (11) to generate power;
the tower type solar heat supply module (300) provides a second heat source for the low-pressure Kalina cycle to drive a second ammonia turbine (25) to generate electricity;
and mixing the working media subjected to high-pressure Kalina circulation and low-pressure Kalina circulation heat exchange for recycling.
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