CN114934843A - Multi-energy efficient complementary integrated dual-pressure ORC combined cycle power generation system - Google Patents
Multi-energy efficient complementary integrated dual-pressure ORC combined cycle power generation system Download PDFInfo
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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
- 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
- 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
- F02C3/00—Gas-turbine plants characterised by the use of combustion products as the working fluid
- F02C3/14—Gas-turbine plants characterised by the use of combustion products as the working fluid characterised by the arrangement of the combustion chamber in the plant
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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
- F02C3/00—Gas-turbine plants characterised by the use of combustion products as the working fluid
- F02C3/20—Gas-turbine plants characterised by the use of combustion products as the working fluid using a special fuel, oxidant, or dilution fluid to generate the combustion products
- F02C3/22—Gas-turbine plants characterised by the use of combustion products as the working fluid using a special fuel, oxidant, or dilution fluid to generate the combustion products the fuel or oxidant being gaseous at standard temperature and pressure
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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
- F02C7/08—Heating air supply before combustion, e.g. by exhaust gases
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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
- F02C7/12—Cooling of plants
- F02C7/14—Cooling of plants of fluids in the plant, e.g. lubricant or fuel
- F02C7/141—Cooling of plants of fluids in the plant, e.g. lubricant or fuel of working fluid
- F02C7/143—Cooling of plants of fluids in the plant, e.g. lubricant or fuel of working fluid before or between the compressor stages
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention discloses a multi-energy efficient complementary integrated double-pressure ORC combined cycle power generation system, which comprises a solar heat collection system, a gas turbine power generation system and a double-pressure ORC cycle power generation system. The compressed air at the outlet of the first compressor is cooled by adopting secondary compression on the air inlet of the gas turbine, so that the air inlet flow and the pressure ratio of the compressor are improved on one hand, and the power consumption of the compressor is effectively reduced on the other hand; a solar heat collection system is utilized, heat is carried through heat conduction oil, and fuel and air in front of a combustion chamber are preheated; the flue gas exhaust of the gas turbine has quite high parameters, the evaporator is used for ORC (organic Rankine cycle) cycle power generation by utilizing the heat energy of high-temperature flue gas, and the flue gas which is not used up at the outlet of the evaporator is used for heating fuel and air; and a solar heat collection system is adopted to heat the air supplement of the organic working medium turbine. Therefore, the invention fully utilizes clean energy and effectively relieves the pressure of shortage of fossil energy.
Description
Technical Field
The invention belongs to the technical field of distributed energy power generation, and particularly relates to a multi-energy efficient complementary integrated double-pressure ORC combined cycle power generation system.
Background
The new energy has the characteristics of volatility and randomness, so that the access of the new energy is not beneficial to the stability of the system to a certain extent, and the capability of the micro-grid for receiving renewable energy is improved by constructing a comprehensive energy system; the comprehensive complementation of various energy sources is explored, the use efficiency of primary energy sources is improved, and the utilization rate of equipment can also be improved; is beneficial to realizing social sustainable development and national energy safety. In China, energy consumed by industrial enterprises represented by steel, chemical industry, cement, coal, electric power and the like accounts for over 70% of all energy consumption of the whole country, the industrial enterprises not only consume a large amount of energy, but also correspondingly discharge a large amount of waste heat, about 17-67% of fuel consumption is discharged into the environment in the form of low-grade waste heat, and the part with recovery value accounts for about 60% of the total amount of waste heat discharge. A large amount of waste heat is discharged into the environment, so that not only is the heat island effect enlarged and the environmental ecology changed, but also the energy is greatly wasted. If the industrial waste heat can be reasonably utilized at a lower cost, the industrial waste heat is converted into a high-grade valuable new energy source to be returned to the system, so that the system not only accords with the national industrial policy, but also can bring great economic and social benefits for enterprises and society.
The low-temperature waste heat energy is relatively low in grade and is generally regarded as waste heat to be discharged into air or water. However, with the increasing shortage of global energy supply, extreme weather caused by greenhouse gases frequently occurs, the research on recycling of the energy is increasing, and many low-grade heat source recycling technologies are emerging. Among them, the low boiling point working medium waste heat power generation technology has especially development prospect. The common waste heat recycling technology generally uses water as a circulation working medium to establish circulation, but the low boiling point working medium waste heat utilization technology uses the low boiling point working medium as a medium, after absorbing energy in low grade waste heat, steam with certain pressure and temperature is generated to further push a turbine to convert mechanical energy into electric energy, and after exhaust gas after acting is condensed, the exhaust gas is conveyed to an evaporator by a working medium circulating pump to absorb heat again, so that a circulation is completed.
The performance of the low-temperature waste heat utilization power generation ORC system is not only influenced by the physical properties of the organic working medium, but also closely related to the state parameters of each state point selected by the system, and the state parameters are greatly dependent on the selection of the structural parameters of the heat exchange equipment. Therefore, optimization of ORC systems is critical to improving their performance, and a great deal of research has been conducted by many scholars both at home and abroad in this area.
Based on the current situation of the existing gas turbine-ORC combined cycle, most of the existing gas turbine-ORC combined cycles are single in form, basically, natural gas is used as fuel of the gas turbine, and because the energy construction of China is mainly based on coal, the natural gas is scarce. The exhaustion of fossil energy promotes green, and a multi-energy complementary gas turbine combined cycle needs to be developed.
Disclosure of Invention
The invention aims to provide a multi-energy efficient complementary integrated double-pressure ORC combined cycle power generation system, which makes full use of a clean heat source of solar energy, reduces consumption of fossil energy and realizes performance of a combined cycle.
In order to achieve the purpose, the invention adopts the following technical scheme:
a multi-energy efficient complementary integrated double-pressure ORC combined cycle power generation system comprises a solar heat collection system, a gas turbine power generation system and a double-pressure ORC cycle power generation system;
the solar heat collection system is used for providing heat for the double-pressure ORC circulating power generation system and the gas turbine power generation system and converting solar energy into internal energy;
the gas turbine power generation system is used for absorbing the waste heat of solar energy, high-temperature flue gas generated in the combustion chamber drives the gas turbine to expand and do work, internal energy is converted into mechanical energy, and the mechanical energy is converted into electric energy in the first generator;
the double-pressure ORC circulating power generation system adopts R245fa as an organic working medium and is used for respectively absorbing the waste heat of exhaust smoke of a gas turbine power generation system and the waste heat of a solar heat collection system, and the working capacity of an ORC turbine is beneficially provided by means of air supplement in the middle of the ORC turbine.
The invention is further improved in that the solar heat collecting system comprises solar energy, a mirror field, a heat absorber, a heat conducting oil tank and a heat conducting oil pump;
the mirror field is used for reflecting solar energy to the heat absorber;
the inlet of the heat absorber is communicated with the outlet of the heat conducting oil tank through the heat conducting oil pump.
In a further improvement of the present invention, the gas turbine power generation system comprises a first heat exchanger, a second heat exchanger, a first compressor, an intercooler, a second compressor, a first combustion chamber, a first gas turbine, a second combustion chamber, a second gas turbine, and a first generator;
the first compressor is used for inputting and compressing air and outputting primary pressurized air;
the intercooler is used for absorbing 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;
the second compressor is used for inputting the cooling and depressurizing air, compressing the air and outputting secondary pressurized air;
the second heat exchanger is used for inputting fuel gas and the secondary pressurized air, preheating by utilizing solar energy and outputting preheated natural gas fuel and compressed air;
the first combustion chamber is used for inputting the preheated fuel gas and air output by the second heat exchanger, combusting the preheated fuel gas and air and outputting flue gas;
the first gas turbine is used for inputting the smoke output by the first combustion chamber to perform expansion work to drive the first generator to generate power and outputting exhaust;
the second gas turbine is used for inputting the smoke output by the second combustion chamber to perform expansion work to drive the first generator to generate power and outputting exhaust;
an outlet of the heat absorber is communicated with inlets of heat source pipelines of the first heat exchanger and the second heat exchanger;
and the inlet of the heat source pipeline of the first heat exchanger is communicated with the inlet of the heat-conducting oil tank through the heat source pipeline of the second heat exchanger.
The invention has the further improvement that the solar heat collecting system adopts a bypass control mode, and a part of high-temperature heat conducting oil enters the second heat exchanger through the first regulating valve.
The solar heat collecting system is further improved in that the solar energy is adopted to heat the working solution at the outlet of the first working medium pump, the organic working medium heated by the first heat exchanger is used for air supplement of the organic working medium turbine, and the acting capacity of the organic working medium turbine is improved.
The invention is further improved in that air is firstly sent into a first compressor, the compressor consumes power and compresses the air at normal temperature and normal pressure into high-pressure air; the high-pressure air is sent into the intercooler, the intercooler cools the high-pressure compressed air, and the temperature and the pressure of the compressed air are reduced due to expansion caused by heat and contraction caused by cold of the air; the compressed air after being cooled and decompressed is sent to a second compressor, the pressure of the compressed air is increased again, the compressed air and the fuel with the increased pressure are sent to a second heat exchanger and heated by high-temperature heat conduction oil in a solar system to preheat the compressed air and the fuel, so that heat loss inside a combustion chamber is reduced, high-temperature and high-pressure flue gas generated in the combustion chamber is firstly sent to a first gas turbine, exhaust of the gas turbine and the fuel from a second regulating valve are simultaneously sent to a second combustion chamber for mixed combustion, and the generated high-temperature and high-pressure gas enters a second gas turbine again to expand to do work.
The invention is further improved in that the first compressor, the second compressor, the first gas turbine and the second gas turbine are coaxially arranged, the other end of the shaft is connected with the first generator, and the generator is driven to rotate by the gas turbine so as to convert mechanical energy into electric energy.
The invention has the further improvement that the double-pressure ORC combined cycle power generation system comprises a first evaporator, an organic working medium turbine, a second generator, a third heat exchanger, a condenser, a liquid storage tank, a first working medium pump and a second working medium pump;
the working medium at the outlet of the first working medium pump is divided into two parts, one part of the working medium enters the first heat exchanger to absorb the waste heat of the heat conducting oil of the solar heat collecting system, one part of the organic working medium at the outlet of the first working medium pump is in a supercooling zone and is gradually heated, and the working fluid is in an overheating state at the outlet of the first heat exchanger to perform intermediate air supplement on the organic working medium turbine;
the other part of the organic working medium at the outlet of the first working medium pump is pressurized under the action of a second working medium pump, the organic working medium enters a first evaporator to absorb the waste heat of exhaust smoke of a power generation system of the gas turbine, the organic working medium is changed into a superheating area from a supercooling area, superheated steam enters an organic working medium turbine to expand and do work to drive a rotor to rotate, and mechanical energy is converted into electric energy in a second generator under the action of a shaft;
working medium after the working medium turbo expansion acting still has higher waste heat, for this part of waste heat of make full use of, in the third heat exchanger, with partial waste heat release for cryogenic working medium, later get into the condenser, under the effect of cooling water, the complete condensation becomes supercooled organic working medium solution to store in the liquid storage pot, the exit linkage of liquid storage pot is to the entry of first working medium pump.
Compared with the prior art, the invention has at least the following beneficial technical effects:
the system of the invention comprises: the system comprises a solar heat collection system, a gas turbine power generation system, a double-pressure ORC circulating power generation system and the like. The solar heat collection system fully utilizes clean solar energy, carries heat through heat conduction oil, and respectively transfers the heat to the gas turbine power generation system and the double-pressure ORC circulating power generation system. Specifically, the air inlet of the gas turbine is compressed for the second time, the intercooler is additionally arranged in the middle of the air inlet, the compressed air of the first compressor is cooled, the principle of expansion with heat and contraction with cold of the air is fully utilized, and the compression power consumption of the second compressor is reduced.
In the invention, solar energy is adopted to provide stable energy input for the gas turbine power generation system and the double-pressure ORC circulating power generation system, so that on one hand, fuel is saved, and on the other hand, energy conservation and emission reduction are realized. Specifically, the working solution at the outlet of the first working medium pump is heated by solar energy, and the organic working medium heated by the first heat exchanger is used for air supplement of the organic working medium turbine, so that the acting capacity of the organic working medium turbine is improved.
According to the invention, the heat conduction oil carries heat to heat the fuel and the air in the second heat exchanger for the heat conduction oil of the gas turbine power generation system, and the flue gas at the outlet of the evaporator is sent into the second heat exchanger to heat the fuel and the air, so that the heat loss of the first combustion chamber is reduced, the temperature of the flue gas at the outlet of the combustion chamber is increased, and the heat loss of the combustion chamber is effectively reduced.
In the invention, in the double-pressure ORC cycle power generation system, the working medium after the organic working medium turbine expands to work still has higher waste heat, and in order to fully utilize the part of the waste heat, the part of the waste heat is released to the low-temperature working medium in the third heat exchanger and then enters the condenser, and is completely condensed into the supercooled organic working medium solution under the action of cooling water.
Drawings
FIG. 1 is a schematic diagram of a multi-energy efficient complementary integrated dual pressure ORC combined cycle power generation system of the present invention.
Description of reference numerals:
1. solar energy; 2. a mirror field; 3. a heat sink; 4. a first regulating valve; 5. a first heat exchanger; 6. a second heat exchanger; 7. a heat conducting oil tank; 8. a heat-conducting oil pump; 9. a first compressor; 10. an intercooler; 11. a second compressor; 12. a second regulating valve; 13. a first combustion chamber; 14. a first gas turbine; 15. a second combustion chamber; 16. a second gas turbine; 17. a first generator; 18. a first evaporator; 19. an organic working medium turbine; 20. a second generator; 21. a third heat exchanger; 22. a condenser; 23. a liquid storage tank; 24. a first working medium pump; 25. and a second working medium 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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," "third," "fourth," and the like in the description and in the claims of the 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 multi-energy efficient complementary integrated dual-pressure ORC combined cycle power generation system is shown, which mainly comprises: the first part is a solar energy collection system, the second part is a gas turbine power generation system, and the third part is a double-pressure ORC cycle power generation system.
Specifically, the solar heat collection system comprises solar energy 1, a mirror field 2, a heat absorber 3, a heat conduction oil tank 7 and a heat conduction oil pump 8; the mirror field 2 is used for reflecting solar energy 1 to the heat absorber 3; the inlet of the heat absorber 3 is communicated with the outlet of the heat conducting oil tank 7 through the heat conducting oil pump 8.
The gas turbine power generation system comprises a first heat exchanger 5, a second heat exchanger 6, a first compressor 9, an intercooler 10, a second compressor 11, a first combustion chamber 13, a first gas turbine 14, a second combustion chamber 15, a second gas turbine 16 and a first generator 17; a first compressor 9 for inputting and compressing air and outputting primary pressurized air; the intercooler 10 is used for absorbing the heat of the air at the outlet of the first compressor 9, so that the temperature of the air is reduced, and the compression power consumption of the second compressor 11 is reduced; the second compressor 11 is used for inputting the cooling and depressurizing air, compressing the air and outputting secondary pressurized air; the second heat exchanger is used for inputting fuel gas and the secondary pressurized air, preheating by utilizing solar energy and outputting preheated natural gas fuel and compressed air; the first combustion chamber 13 is used for inputting the preheated fuel gas and air output by the second heat exchanger, combusting the preheated fuel gas and air and outputting flue gas; the first gas turbine 14 is used for inputting the flue gas output by the first combustion chamber 13 to perform expansion work to drive the first generator 17 to generate power and outputting exhaust; the second gas turbine 16 is used for inputting the flue gas output by the second combustion chamber 15 to perform expansion work to drive the first generator 17 to generate power and output exhaust; the outlet of the heat absorber 3 is communicated with the inlets of the heat source pipelines of the first heat exchanger 5 and the second heat exchanger 6; an inlet of the heat source pipeline of the first heat exchanger 5 is communicated with an inlet of the heat-conducting oil tank 7 through the heat source pipeline of the second heat exchanger 6.
The double-pressure ORC combined cycle power generation system comprises a first evaporator 18, an organic working medium turbine 19, a second generator 20, a third heat exchanger 21, a condenser 22, a liquid storage tank 23, a first working medium pump 24 and a second working medium pump 25; the working medium at the outlet of the first working medium pump 24 is divided into two parts, one part of the working medium enters the first heat exchanger 5 to absorb the waste heat of the heat conducting oil of the solar heat collecting system, one part of the organic working medium at the outlet of the first working medium pump 24 is in an supercooling zone and is gradually heated, and the working fluid is in an overheating state at the outlet of the first heat exchanger 5 to perform intermediate air supplement on the organic working medium turbine 19; the other part of the organic working medium at the outlet of the first working medium pump 24 is pressurized under the action of the second working medium pump 25, enters the first evaporator 18 to absorb the waste heat of the exhaust smoke of the gas turbine power generation system, the organic working medium is changed into a superheat area from a supercooling area, superheated steam enters the organic working medium turbine 19 to expand and do work to drive the rotor to rotate, and mechanical energy is converted into electric energy in the second generator 20 under the action of a shaft; the working medium after the working medium turbine 19 expands to do work still has high waste heat, in order to fully utilize the part of the waste heat, the part of the waste heat is released to the low-temperature working medium in the third heat exchanger 21, then enters the condenser 22, is completely condensed into the supercooled organic working medium solution under the action of cooling water, and is stored in the liquid storage tank 23, and the outlet of the liquid storage tank 23 is connected to the inlet of the first working medium pump 24.
Further, the first part is a solar heat collection system, solar energy 1 generated in the daytime absorbs heat energy through the reflection effect of the mirror field 2, heat conducting oil in the heat absorber 3 rises in temperature, and part of high-temperature heat conducting oil enters the second heat exchanger 6. The solar heat collection system adopts a bypass control mode, a part of high-temperature heat conduction oil enters the second heat exchanger 6 through the first adjusting valve 4, the heat release quantity of the heat conduction oil in the second heat exchanger 6 is controlled by controlling the valve opening degree of the first adjusting valve 4, when the opening degree of the first adjusting valve 4 is increased, the heat release quantity in the second heat exchanger 6 is increased, and therefore the heating degree of compressed air and fuel is controlled.
The second part of the gas turbine power generation system mainly comprises: air is firstly sent into a first compressor 9, the compressor consumes power and compresses the air at normal temperature and normal pressure into high-pressure air; further, in order to further compress the high-pressure air, the high-pressure air is cooled, so that the high-pressure air is sent to the intercooler 10, the intercooler 10 cools the high-pressure compressed air, and the temperature and the pressure of the compressed air are reduced due to expansion caused by heat and contraction caused by cold of the air; further, the compressed air after being cooled and depressurized is sent to the second compressor 11, the pressure of the compressed air is raised again, the compressed air and the fuel with the raised pressure are sent to the second heat exchanger 6, and are heated by high-temperature heat conduction oil in the solar energy system, the compressed air and the fuel are preheated, heat loss in the combustion chamber is reduced, high-temperature and high-pressure flue gas generated in the combustion chamber is firstly sent to the first gas turbine 14, exhaust gas of the gas turbine and the fuel from the second regulating valve 12 are simultaneously sent to the second combustion chamber 15 for mixed combustion, and the generated high-temperature and high-pressure flue gas enters the second gas turbine 16 again for expansion and work. Preferably, the first compressor 9, the second compressor 11, the first gas turbine 14 and the second gas turbine 16 are coaxially arranged, and the other end of the shaft is connected with the first generator 17, so that the generator is driven by the gas turbine to rotate, and mechanical energy is converted into electric energy.
The third part is a double-pressure ORC cycle power generation system, and because the second part of the gas turbine power generation system generates high-temperature waste heat flue gas in the second gas turbine 16, if the high-temperature waste heat flue gas is not utilized, the high-temperature waste heat flue gas causes great energy loss, a double-pressure ORC cycle power generation system is added as a bottom cycle, and the aim is to fully utilize high-temperature exhaust gas of the gas turbine. Firstly, the exhaust gas of the gas turbine enters the first evaporator 18 to release heat, the released heat is absorbed by the organic working medium solution, so that the organic working medium solution is converted into high-temperature high-pressure superheated ammonia vapor, the superheated organic working medium is sent into the turbine to expand and do work, the internal energy is converted into mechanical energy, and the mechanical energy is converted into electric energy in the second generator 20. The working medium at the outlet of the first working medium pump is divided into two parts, one part of the working medium enters the first heat exchanger 5 to absorb the waste heat of the heat conducting oil of the solar heat collecting system, one part of the organic working medium at the outlet of the first working medium pump 24 is in a supercooling zone and is gradually heated, and the working fluid is in an overheating state at the outlet of the first heat exchanger 5 to perform intermediate air supplement on the organic working medium turbine 19, so that more organic working media enter the turbine to do work through expansion, and the working capacity of the organic working medium turbine is improved. The working medium after the organic working medium turbine expands to work still has higher waste heat, in order to fully utilize the part of waste heat, the part of waste heat is released to the low-temperature working medium in the third heat exchanger, then enters the condenser, and is completely condensed into the supercooled organic working medium solution under the action of cooling water, the supercooled solution is sent into the liquid storage tank, further, the organic working medium solution in the liquid storage tank is sent into the working medium pump, and the working medium pump is used for supercharging, so that the pressure of the working medium is improved. The solution at the outlet of the first working medium pump consists of two parts, wherein one part is heated by high-temperature heat conducting oil from a solar heat collecting system and is used for air supplement of the organic working medium turbine; the other part of the compressed working medium is sent to a second working medium pump, the boosted working medium absorbs the waste heat of the exhaust smoke of the gas turbine power generation system in the evaporator, and the generated superheated steam enters an organic working medium turbine to expand and do work to complete the whole power generation cycle.
The embodiment of the invention provides a multi-energy efficient complementary integrated double-pressure ORC combined cycle power generation system, which adopts secondary compression for air inlet of a gas turbine and cools compressed air at an outlet of a first compressor, so that on one hand, the air inlet flow and the pressure ratio of the compressor are improved, and on the other hand, the power consumption of the compressor is effectively reduced; the solar heat collection system is utilized, heat is carried by the heat conduction oil, and fuel and air in front of the combustion chamber are preheated, so that heat loss of the combustion chamber is effectively reduced; the flue gas exhaust of the gas turbine has quite high parameters, the evaporator is used for ORC (organic Rankine cycle) cycle power generation by utilizing the heat energy of high-temperature flue gas, the flue gas which is not used up at the outlet of the evaporator is used for heating fuel and air, and the waste heat of the flue gas is further utilized; the solar heat collecting system is adopted to heat the air supplement of the organic working medium turbine, so that the working capacity of the organic working medium turbine is improved. Therefore, the multi-energy efficient complementary integrated double-pressure ORC combined cycle power generation system fully utilizes the means of solar energy, intake air cooling, organic working medium turbine air supplement and the like, fully utilizes clean energy, and effectively relieves the pressure of fossil energy shortage.
Finally, it should be noted that: although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art 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 (8)
1. A multi-energy efficient complementary integrated double-pressure ORC combined cycle power generation system is characterized by comprising a solar heat collection system, a gas turbine power generation system and a double-pressure ORC cycle power generation system;
the solar heat collection system is used for providing heat for the double-pressure ORC circulating power generation system and the gas turbine power generation system and converting solar energy into internal energy;
the gas turbine power generation system is used for absorbing the waste heat of solar energy, high-temperature flue gas generated in the combustion chamber drives the gas turbine to expand and do work, internal energy is converted into mechanical energy, and the mechanical energy is converted into electric energy in the first power generator (17);
the double-pressure ORC circulating power generation system adopts R245fa as an organic working medium and is used for respectively absorbing the exhaust waste heat of the gas turbine power generation system and the waste heat of the solar heat collection system, and the working capacity of the ORC turbine is beneficially provided by a mode of air supplement in the middle of the ORC turbine.
2. The multi-energy efficient complementary integrated dual-pressure ORC combined cycle power generation system according to claim 1, wherein the solar energy collection system comprises solar energy (1), a mirror field (2), a heat absorber (3), a heat conducting oil tank (7) and a heat conducting oil pump (8);
the mirror field (2) is used for reflecting solar energy (1) to the heat absorber (3);
the inlet of the heat absorber (3) is communicated with the outlet of the heat-conducting oil tank (7) through the heat-conducting oil pump (8).
3. The multi-energy efficient complementary integrated dual pressure ORC combined cycle power generation system according to claim 2, wherein the gas turbine power generation system comprises a first heat exchanger (5), a second heat exchanger (6), a first compressor (9), an intercooler (10), a second compressor (11), a first combustor (13), a first gas turbine (14), a second combustor (15), a second gas turbine (16), and a first generator (17);
a first compressor (9) for inputting and compressing air and outputting primary pressurized air;
the intercooler (10) is used for absorbing the heat of the air at the outlet of the first compressor (9), so that the temperature of the air is reduced, and the compression power consumption of the second compressor (11) is reduced;
the second compressor (11) is used for inputting the cooling and depressurizing air, compressing the air and outputting secondary pressurized air;
the second heat exchanger is used for inputting fuel gas and the secondary pressurized air, preheating by utilizing solar energy and outputting preheated natural gas fuel and compressed air;
the first combustion chamber (13) is used for inputting the preheated fuel gas and air output by the second heat exchanger, combusting the preheated fuel gas and air and outputting flue gas;
the first gas turbine (14) is used for inputting the flue gas output by the first combustion chamber (13) to perform expansion work to drive the first generator (17) to generate power and output exhaust gas;
the second gas turbine (16) is used for inputting the flue gas output by the second combustion chamber (15) to perform expansion work to drive the first generator (17) to generate power and output exhaust;
the outlet of the heat absorber (3) is communicated with the inlets of the heat source pipelines of the first heat exchanger (5) and the second heat exchanger (6);
and the inlet of the heat source pipeline of the first heat exchanger (5) is communicated with the inlet of the heat-conducting oil tank (7) through the heat source pipeline of the second heat exchanger (6).
4. The combined multi-energy efficient complementary integrated dual-pressure ORC power generation system according to claim 3, wherein the solar heat collection system is controlled by a bypass, and a part of the high-temperature heat transfer oil enters the second heat exchanger (6) through the first regulating valve (4).
5. The multi-energy efficient complementary integrated double-pressure ORC combined cycle power generation system as claimed in claim 3, wherein the solar heat collection system heats the working solution at the outlet of the first working medium pump (24) by using solar energy, and the organic working medium heated by the first heat exchanger (5) is used for air supplement of the organic working medium turbine, so that the working capacity of the organic working medium turbine is improved.
6. A multi-energy efficient complementary integrated dual pressure ORC combined cycle power generation system according to claim 3, wherein air is first fed into a first compressor (9) that consumes power to compress the air at ambient temperature and pressure to air at high pressure; the high-pressure air is sent into the intercooler (10), the intercooler (10) cools the high-pressure compressed air, and the temperature and the pressure of the compressed air are reduced due to expansion and contraction of the air; the compressed air after being cooled and decompressed is sent to a second compressor (11), the pressure of the compressed air is increased again, the compressed air and fuel with the increased pressure are sent to a second heat exchanger (6) and are heated by high-temperature heat conduction oil in a solar energy system to preheat the compressed air and the fuel, heat loss inside a combustion chamber is reduced, high-temperature and high-pressure flue gas generated in the combustion chamber is firstly sent to a first gas turbine (14), exhaust gas of the gas turbine and the fuel from a second regulating valve (12) are simultaneously sent to a second combustion chamber (15) to be mixed and combusted, and the generated high-temperature and high-pressure fuel gas enters a second gas turbine (16) again to be expanded to do work.
7. The combined cycle ORC system according to claim 3, wherein the first compressor (9), the second compressor (11), the first gas turbine (14) and the second gas turbine (16) are coaxially arranged, and the other end of the shaft is connected to the first generator (17), and the generator is driven by the gas turbine to rotate, so as to convert mechanical energy into electric energy.
8. The multi-energy efficient complementary integrated dual-pressure ORC combined cycle power generation system according to claim 3, characterized in that the dual-pressure ORC combined cycle power generation system comprises a first evaporator (18), an organic working medium turbine (19), a second generator (20), a third heat exchanger (21), a condenser (22), a liquid storage tank (23), a first working medium pump (24) and a second working medium pump (25);
the working medium at the outlet of the first working medium pump (24) is divided into two parts, one part of the working medium enters the first heat exchanger (5) to absorb the waste heat of the heat conducting oil of the solar heat collection system, one part of the organic working medium at the outlet of the first working medium pump (24) is in an supercooling zone and is gradually heated, and at the outlet of the first heat exchanger (5), the working fluid is in an overheating state to perform intermediate air supplement on the organic working medium turbine (19);
the other part of the organic working medium at the outlet of the first working medium pump (24) is pressurized under the action of a second working medium pump (25), the organic working medium enters a first evaporator (18) to absorb the waste heat of exhaust smoke of a gas turbine power generation system, the organic working medium is converted into a superheat area from a supercooling area, superheated steam enters an organic working medium turbine (19) to expand and do work to drive a rotor to rotate, and mechanical energy is converted into electric energy in a second generator (20) under the action of a shaft;
the working medium after the working medium turbine (19) expands to work still has higher waste heat, and in order to fully utilize the part of waste heat, the part of waste heat is released to the low-temperature working medium in the third heat exchanger (21), and then enters the condenser (22), and under the action of cooling water, the part of waste heat is completely condensed into supercooled organic working medium solution and is stored in the liquid storage tank (23), and the outlet of the liquid storage tank (23) is connected to the inlet of the first working medium pump (24).
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| CN117308402A (en) * | 2023-11-30 | 2023-12-29 | 中国航空工业集团公司金城南京机电液压工程研究中心 | Electric heating complementary system with compressed working medium as power source and heat sink |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117308402A (en) * | 2023-11-30 | 2023-12-29 | 中国航空工业集团公司金城南京机电液压工程研究中心 | Electric heating complementary system with compressed working medium as power source and heat sink |
| CN117308402B (en) * | 2023-11-30 | 2024-02-23 | 中国航空工业集团公司金城南京机电液压工程研究中心 | Electric heating complementary system with compressed working medium as power source and heat sink |
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