CN114151151B - System for coupling compressed air energy storage with biomass energy and internal combustion engine and operation method - Google Patents
System for coupling compressed air energy storage with biomass energy and internal combustion engine and operation method Download PDFInfo
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- CN114151151B CN114151151B CN202111476752.1A CN202111476752A CN114151151B CN 114151151 B CN114151151 B CN 114151151B CN 202111476752 A CN202111476752 A CN 202111476752A CN 114151151 B CN114151151 B CN 114151151B
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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
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
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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
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
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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
- F01K21/00—Steam engine plants not otherwise provided for
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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
- F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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Abstract
The invention discloses a system for coupling compressed air energy storage with biomass energy and an internal combustion engine and an operation method thereof, wherein the system comprises an air energy storage unit, an internal combustion engine power generation unit and a methane generation unit; the compressed air energy storage unit comprises a motor, a heat insulation compressor, a heat storage container, a gas storage tank, an ejector, a heat insulation expander and a first generator which are sequentially connected, and an injected gas inlet is connected with an exhaust port of the internal combustion engine power generation unit through a booster pump; the methane generating unit comprises a methane tank, a carbon dioxide absorbing device and a dehumidifying device which are connected in sequence, and the methane tank is connected with the outlet of the heat insulation expansion machine; the outlets of the heat storage container and the dehumidifying device are also connected with a working medium inlet of the power generation unit of the internal combustion engine; the compression heat is stored in the heat storage container, air enters the heat storage container to absorb heat and then enters the internal combustion engine power generation unit, so that the utilization of a low-grade heat source is realized, high-temperature exhaust gas of the internal combustion engine power generation unit is mixed in the ejector and then enters the heat insulation expansion machine to do work, and the heat transfer loss and the pressure drop loss of the reheater are avoided.
Description
Technical Field
The invention belongs to the technical field of compressed air energy storage coupling renewable energy sources, and particularly relates to a system for coupling compressed air energy storage with biomass energy and an internal combustion engine and an operation method.
Background
The biomass energy has the advantages of renewability, cleanness, low carbon, abundant raw materials, direct combustion of replaceable fossil fuels and the like. The utilization of biomass energy mainly comprises 3 ways such as direct combustion, thermochemical conversion and biochemical conversion. The conversion of biomass energy into biogas refers to the production of a combustible mixed gas, i.e. biogas, with methane as the main component by microbial fermentation of organic substances in an anaerobic environment. In winter, the methane tank or the heat insulation material is additionally used for heat insulation of the methane tank, and the stirring of the methane tank can increase additional power consumption. When the internal combustion engine generates electricity, the exhaust temperature is generally 400-. The temperature of the exhaust gas of the compressed air energy storage system is slightly higher than the ambient temperature and has a certain speed, and the direct exhaust of the part of gas to the atmosphere also causes a great deal of energy waste and increases the emission of carbon dioxide; the ejector is adopted to reduce the pressure at the inlet of the compressed air energy storage and release section, so that the inlet flow of the expansion machine can be increased, and the system efficiency can be improved; the traditional compressed air energy storage reheater has heat transfer temperature difference and pressure loss, which affects the output power of the expansion machine and the efficiency of the system exergy, and the utilization degree of the compression heat in the compression section of the system is not high.
Disclosure of Invention
In order to solve the problems of expander exhaust loss, reheater heat transfer and pressure drop loss, the problem that high-temperature exhaust of an internal combustion engine is not utilized and the problem of uneconomic performance of a methane tank in the conventional compressed air energy storage system, the invention provides a system and an operation method for coupling compressed air energy storage with biomass energy and the internal combustion engine by combining the characteristics of compressed air energy storage, an ejector, the internal combustion engine and biomass in the methane tank. The compressed heat is stored in the heat storage container, and the air enters the heat storage container to absorb the heat and then enters the internal combustion engine to provide oxygen for methane combustion, so that the utilization of a low-grade heat source is realized.
The invention is realized by the following technical scheme: a system for coupling compressed air energy storage with biomass energy and an internal combustion engine comprises a compressed air energy storage unit, an internal combustion engine power generation unit and a methane generation unit; the compressed air energy storage unit comprises a motor, a heat insulation compressor, a heat storage container, a gas storage tank, an ejector, a heat insulation expander and a first generator which are sequentially connected, and an injected gas inlet is connected with an exhaust port of the internal combustion engine power generation unit through a booster pump; the methane generating unit comprises a methane tank, a carbon dioxide absorbing device and a dehumidifying device which are connected in sequence, and the methane tank is connected with the outlet of the heat insulation expansion machine; the outlet of the cold side of the heat storage container and the outlet of the dehumidifying device are also connected with a working medium inlet of the internal combustion engine power generation unit.
A heat storage container and a first throttling valve are arranged between the heat insulation compressor and the gas storage tank, and an outlet of the gas storage tank is connected with a high-pressure gas inlet of the ejector through a second throttling valve.
The internal combustion engine power generation unit comprises an internal combustion engine and a second generator, the internal combustion engine is connected with the second generator, and a working medium inlet and an exhaust port of the internal combustion engine are respectively used as a working medium inlet of the internal combustion engine power generation unit and an exhaust port of the internal combustion engine power generation unit.
The methane tank comprises a gas buffer chamber, a methane generating chamber and a heat exchange chamber, wherein the methane generating chamber is arranged below the gas buffer chamber, the heat exchange chamber is arranged on the side surface of the methane generating chamber, the methane generating chamber is communicated with the gas buffer chamber, the gas buffer chamber is communicated with an exhaust port of the adiabatic expander, and the methane generating chamber is connected with a carbon dioxide absorption device; the gas buffer chamber is connected with the heat exchange chamber through a third throttle valve, and the heat exchange chamber is connected with the atmosphere through a fourth throttle valve.
Heat exchange fins are distributed on two surfaces of the contact wall of the heat exchange chamber of the biogas digester and the biogas generation chamber, and the surfaces of the heat exchange fins, which are in direct contact with the biomass, are provided with anti-corrosion coatings.
A gas-liquid heat exchange stirrer and a stirring impeller are arranged in the methane generating chamber, and a power impeller is arranged in the gas buffer chamber; the gas-liquid heat exchange stirrer is provided with a gas-liquid heat exchange stirrer inlet pipe, is communicated with the gas buffer chamber through the gas-liquid heat exchange stirrer inlet pipe, is provided with a gas-liquid heat exchange stirrer outlet hole, and is communicated with the biogas generation chamber through the gas-liquid heat exchange stirrer outlet hole; the power impeller is connected with the stirring impeller through an impeller rotating shaft.
The gas outlet holes of the gas-liquid heat exchange stirrer are uniformly arranged on the contact surface of the gas-liquid heat exchange stirrer and the biogas generating chamber, and the inlet pipes of the gas-liquid heat exchange stirrer are distributed around the biogas digester.
The carbon dioxide absorbing device is filled with a carbon dioxide absorbent, and the dehumidifying device is filled with a drying agent.
According to the operation method of the system, during energy storage, air is compressed by the adiabatic compressor and then enters the heat storage container, and high-pressure air is released in the heat storage container and then enters the air storage tank; when energy is released, high-pressure gas in the gas storage tank enters a main working gas inlet of the ejector, high-temperature exhaust gas of the internal combustion engine enters the ejector after being lifted to set pressure by the booster pump and then enters the ejector to be driven by the gas inlet of the ejector, the high-pressure gas and the high-temperature exhaust gas in the gas storage tank are fully mixed in the ejector, the required temperature and pressure before the adiabatic expander are maintained, the heat and pressure are fed into the adiabatic expander to do work, and the adiabatic expander drives the first generator to generate electricity;
when the electricity consumption peak and the compressed air energy storage system need to release energy, air enters the internal combustion engine power generation unit after being heated by the heat storage container, methane gas in the methane generation chamber enters the internal combustion engine power generation unit after being subjected to carbon dioxide removal by the carbon dioxide absorption device and water removal by the dehumidification device, and the air and the methane gas in the internal combustion engine power generation unit are mixed and combusted to perform energy conversion power generation; the adiabatic expander with excess speed, temperature and pressure exhausts gas to enter the methane tank to assist the operation of the methane tank.
Exhausting the heat-insulating expansion machine with the residual speed, the temperature and the pressure into a gas buffer chamber, so that the power impeller is forced to rotate and simultaneously drives the stirring impeller to rotate; and one part of gas in the gas buffer chamber enters the heat exchange chamber under the action of pressure difference, is fully subjected to heat exchange with biomass in the methane generation chamber and then is discharged to the atmosphere through the fourth throttle valve, and the other part of gas in the gas buffer chamber enters the gas-liquid heat exchange stirrer through the gas-liquid heat exchange stirrer inlet pipe, further enters the methane generation chamber through the gas outlet hole of the gas-liquid heat exchange stirrer and then enters the carbon dioxide absorption device together with the generated methane gas.
Compared with the prior art, the invention has the following beneficial technical effects:
according to the invention, compressed air energy storage, internal combustion engine power generation and biomass energy generation are coupled with one another, high-temperature exhaust of the internal combustion engine power generation unit enters the ejector, the energy of the high-temperature exhaust of the internal combustion engine is fully utilized, the flow rate of the high-temperature exhaust of the internal combustion engine is increased, air firstly enters the heat storage container to absorb heat and then enters the internal combustion engine, the ejector ejects the exhaust of the internal combustion engine, the pressure regulation is realized, the temperature in front of the expander is increased, the pressure loss and the heat transfer loss caused by the use of a reheater are avoided, and the low-grade compression heat is fully utilized, and the power generation economy of the internal combustion engine is improved; the exhaust gas of the heat insulation expansion machine is introduced into the methane tank for utilization, so that the disturbance of the methane tank and the supply of heat are increased while the exhaust gas utilization of the heat insulation expansion machine is realized, and the economy of the methane tank is improved; the carbon dioxide absorption device is used for absorbing carbon dioxide carried in methane gas, so that the system also has the characteristic of low carbon emission.
Furthermore, the invention takes the exhaust of the heat insulation expander as the power gas source of the power impeller of the methane tank, the power impeller drives the stirring impeller to rotate, under the action of the pressure difference and the throttle valve, one part of gas enters the heat exchange chamber of the methane tank, transfers heat to the biomass in the methane generation chamber and then is discharged to the atmosphere, and the other part of gas enters the heat exchange pipeline of the methane tank, provides heat for the methane tank and increases the disturbance of the methane tank; the exhaust of the expansion machine with a certain residual speed provides power for the power impeller and drives the stirring impeller to rotate, so that the exhaust residual speed of the expansion machine is utilized, the mixing degree of biomass in the methane tank is improved, and the methane production rate is improved.
Furthermore, besides the gas entering the gas-liquid heat exchange stirrer, the other part of the gas enters the heat exchange chamber through the throttle valve, so that the utilization of the exhaust heat of the expansion machine is realized, the biomass temperature is increased, and the methane production rate and the system efficiency are further increased.
Drawings
FIG. 1 is a system for coupling compressed air energy storage to biomass energy and an internal combustion engine according to the present invention.
FIG. 2 is a perspective view of the gas-liquid heat exchange stirrer of the present invention.
FIG. 3 is a plan view of the gas-liquid heat exchange stirrer of the present invention.
FIG. 4 is a top view of the heat exchange chamber of the methane tank of the present invention.
FIG. 5 is a schematic view of the heat exchange chamber and the external fins of the biogas digester of the present invention.
In the figure: 1. an electric motor; 2. an adiabatic compressor; 3. a heat storage container; 4. a first throttle valve; 5. a gas storage tank; 6. a second throttle valve; 7. an ejector; 8. an adiabatic expander; 9. a first generator; 10. a booster pump; 11. a third throttle valve; 12. an internal combustion engine; 13. a dehumidifying device; 14. a carbon dioxide absorbing device; 15. a second generator; 16. a biogas generating pit; 17. a power blade; 18. an impeller shaft; 19. a gas-liquid heat exchange stirrer; 20. a stirring impeller; 21. an inlet pipe of the gas-liquid heat exchange stirrer; 22. a gas buffer chamber; 23. a biogas generation chamber; 24. an air outlet of the gas-liquid heat exchange stirrer; 25. a heat exchange chamber; 26. a fourth throttle valve; 27. and heat exchange fins.
Detailed Description
The invention is described in detail below with reference to specific embodiments and the attached drawings.
The invention couples the compressed air energy storage system, the internal combustion engine power generation system and the biomass energy generation system with each other. The compressed heat is stored in the heat storage container, and the air enters the heat storage container to absorb the heat and then enters the internal combustion engine to provide oxygen for methane combustion, so that the utilization of a low-grade heat source is realized. High-temperature exhaust of the internal combustion engine is used as injected gas, and is mixed with low-temperature high-pressure gas in the injector to become medium-pressure gas with higher temperature, and the medium-pressure gas enters a turbine to do work, so that heat transfer loss and pressure drop loss of a reheater are avoided; the exhaust of the expander is used as a power gas source of a power impeller of the methane tank, under the action of pressure difference and a throttle valve, one part of gas enters a gas heat exchange chamber of the methane tank and transfers heat to a biomass in a methane generation chamber and then is exhausted to the atmosphere, and the other part of gas enters a heat exchange pipeline of the methane tank to provide heat for the methane tank and increase the disturbance of the methane tank, thereby realizing the exhaust utilization of the expander, increasing the disturbance of the methane tank and the supply of heat and improving the economy of the methane tank.
As shown in fig. 1, an operating system for coupling compressed air energy storage with biomass energy and an internal combustion engine comprises a compressed air energy storage unit, an internal combustion engine power generation unit and a biogas generation unit;
the system specifically comprises a motor 1, a heat insulation compressor 2, a heat storage container 3, a first throttle valve 4, a gas storage tank 5, a second throttle valve 6, an ejector 7, a heat insulation expander 8, a first generator 9, a booster pump 10, a third throttle valve 11, an internal combustion engine 12, a dehumidifying device 13, a carbon dioxide absorbing device 14, a second generator 15, a methane tank 16, power blades 17, an impeller rotating shaft 18, a gas-liquid heat exchange stirrer 19, a stirring impeller 20, a gas-liquid heat exchange stirrer inlet pipe 21, a gas buffer chamber 22, a methane generating chamber 23, a gas-liquid heat exchange stirrer gas outlet 24, a heat exchange chamber 25, a fourth throttle valve 26 and fins 27;
the compressed air energy storage unit comprises a motor 1, a heat insulation compressor 2, a heat storage container 3, a gas storage tank 5, an ejector 7, a heat insulation expansion machine 8 and a first generator 9 which are sequentially connected, wherein the heat storage container 3 and a first throttling valve 4 are arranged between the heat insulation compressor 2 and the gas storage tank 5, an outlet of the gas storage tank 5 is connected with a high-pressure gas inlet of the ejector 7 through a second throttling valve 6, and an injected gas inlet is connected with an exhaust port of the internal combustion engine through a booster pump 10; the internal combustion engine power generation unit comprises an internal combustion engine 12 and a second generator 15, a working medium inlet of the internal combustion engine 12 is connected with the heat storage container 3, and the internal combustion engine 12 is connected with the second generator 15; the methane generating unit comprises a methane tank 16, a carbon dioxide absorbing device 14 and a dehumidifying device 13 which are connected in sequence, wherein the methane tank 16 is connected with an outlet of the heat insulation expansion machine 8, and the dehumidifying device 13 is connected with an inlet of the internal combustion engine.
The methane tank 16 comprises a gas buffer chamber 22, a methane generating chamber 23, a heat exchange chamber 25, a gas-liquid heat exchange stirrer 19, a power impeller 17 and a stirring impeller 20, wherein the gas buffer chamber 22 is connected with an exhaust port of the adiabatic expander 8, an inlet pipe 21 of the gas-liquid heat exchange stirrer is communicated with the gas buffer chamber 22, an air outlet hole 24 of the gas-liquid heat exchange stirrer is communicated with the methane generating chamber 23, the power impeller 17 in the gas buffer chamber 22 is connected with the stirring impeller 20 in the methane generating chamber through an impeller rotating shaft 18, and the methane generating chamber 23 is connected with a carbon dioxide absorption device 14; the gas buffer chamber 22 is connected to the heat exchange chamber 25 via a third throttle valve 11, and the heat exchange chamber 25 is connected to the atmosphere via a fourth throttle valve 26.
The electric energy of the compressor set motor 1 comes from the surplus electric quantity in the electricity utilization valley, the heat insulation compressor 2 adopts a double-screw compressor, and the heat insulation expander 8 adopts a double-screw expander.
The power impeller 17, the stirring impeller 20 and the impeller rotating shaft 18 are all made of metal with good heat conductivity, and the outer surfaces of the power impeller, the stirring impeller and the impeller rotating shaft are all provided with antirust coatings, and the power impeller is driven to rotate by the exhaust impact of the expander with a certain speed to further drive the stirring impeller 22 to rotate.
The gas-liquid heat exchange stirrer 19 and the gas-liquid heat exchange stirrer inlet pipe 21 are internally and externally provided with antirust coatings and have better heat conduction performance, and the gas outlet holes 24 of the gas-liquid heat exchange stirrer are uniformly distributed on the contact surface of the gas-liquid heat exchange stirrer 19 and the biogas generation chamber 23; four gas-liquid heat exchange stirrer inlet pipes 21 are distributed at four corners of the methane tank 16.
The sealing performance of the contact parts of various pipelines, rotating shafts and the like and the methane tank 16 is good.
The carbon dioxide absorbing device 14 is filled with a carbon dioxide absorbent which is alkaline solution, the dehumidifying device 13 is filled with a drying agent, the alkaline solution is sodium hydroxide solution, potassium hydroxide solution or calcium hydroxide solution, and the drying agent is calcium sulfate, calcium oxide, silica gel or activated alumina.
The invention relates to a system for coupling compressed air energy storage with biomass energy and an internal combustion engine and an operation method, which comprises the following steps:
during energy storage, air is compressed by a heat insulation compressor 2 of the compressor unit and then enters a heat storage container 3, and high-pressure air releases heat in the heat storage container 3 and then enters an air storage tank 5 through a first throttling valve 4; when energy is released, high-pressure gas in the gas storage tank 5 enters a main working gas inlet of the ejector 7 through the second throttle valve 6, high-temperature exhaust gas of the internal combustion engine is boosted to a set pressure through the booster pump 10 and enters the ejector 7 to be injected into the gas inlet of the ejector, the high-pressure gas of the gas storage tank and the high-temperature exhaust gas are fully mixed in the ejector 7 and then enter the adiabatic expander 8 to do work after the required temperature and pressure in front of the adiabatic expander 8 are maintained, and the expander drives the first generator 9 to generate power.
When the electricity consumption peak and the compressed air energy storage system need to release energy, air enters the internal combustion engine 12 after being heated by the heat storage container 3, methane gas in the methane generating chamber 23 enters the internal combustion engine 12 after being subjected to carbon dioxide removal by the carbon dioxide absorbing device 14 and water removal by the dehumidifying device 13, and the air and the methane gas are mixed in the internal combustion engine 12 and then are combusted to drive the second generator 15 to generate electricity; the exhaust gas of the adiabatic expansion machine 8 with certain excess speed, temperature and pressure enters a gas buffer chamber 22 of the methane tank 16, so that the power impeller 17 is forced to rotate and simultaneously drives the stirring impeller 20 to rotate, thereby increasing the mixing degree of the biomass in the methane tank 16; one part of gas in the gas buffer chamber 22 enters the heat exchange chamber 25 under the action of pressure difference, fully exchanges heat with biomass in the methane generation chamber 23 and then is discharged to the atmosphere through the fourth throttle valve 26, the other part of gas enters the gas-liquid heat exchange stirrer 19 through the gas-liquid heat exchange stirrer inlet pipe 21 and further enters the methane generation chamber 23 through the gas-liquid heat exchange stirrer outlet hole 24, the bubbles exchange heat with the biomass in the methane generation chamber 23 in the floating process and increase the disturbance degree of the biomass, and then the bubbles and the generated methane gas enter the carbon dioxide absorption device 14.
The fermentation temperature in the methane tank 16 is kept at 45-60 ℃, and the raw materials in the methane tank 16 mainly comprise livestock manure, waste straws and the like. The amount of gas introduced into the heat exchange chamber 25 and the gas-liquid heat exchange stirrer 19 is determined according to the stirring degree of the biomass, and when the stirring degree is low, the amount of gas introduced into the gas-liquid heat exchange stirrer 19 is increased, whereas when the stirring degree is low, the amount of gas is decreased.
As shown in fig. 2, which is a perspective view of the gas-liquid heat exchange stirrer of the present invention, the stirrer comprises four gas-liquid heat exchange stirrer inlet pipes 21 and a plurality of gas outlet holes 24, wherein the gas-liquid heat exchange stirrer inlet pipe 21 is made of a metal material with good heat conductivity and an anti-rust coating on the surface.
As shown in FIG. 3, which is a top view of the gas-liquid heat exchange stirrer of the present invention, four gas-liquid heat exchange stirrer inlet pipes 21 are distributed at four corners of the biogas digester 16, a plurality of gas-liquid heat exchange stirrer outlet holes 24 are uniformly distributed on the contact surface of the gas-liquid heat exchange stirrer 19 and the biogas generating chamber 23, and after passing through the gas-liquid heat exchange stirrer outlet holes 24, the gas freely floats upwards from the bottom of the biogas generating chamber 23, so as to preserve heat of biomass in the biogas digester 16 and increase the biomass disturbance degree.
FIG. 4 is a top view of the heat exchange chamber 25 of the biogas digester, wherein the heat exchange chamber 25 is distributed around the biogas generating chamber 23 and transfers heat to the biomass through the fins 27.
FIG. 5 is a schematic view of the heat exchange chamber inner and outer fins of the biogas digester of the present invention, wherein the inner and outer fins 27 have good heat conductivity, and the fins contacting with the biomass have anti-rust coatings.
Claims (8)
1. A system for coupling compressed air energy storage with biomass energy and an internal combustion engine is characterized by comprising an air energy storage unit, an internal combustion engine power generation unit and a methane generation unit; the compressed air energy storage unit comprises a motor (1), a heat insulation compressor (2), a heat storage container (3), a gas storage tank (5), an ejector (7), a heat insulation expansion machine (8) and a first generator (9) which are connected in sequence, and an injected gas inlet is connected with an exhaust port of the internal combustion engine power generation unit through a booster pump (10); the methane generating unit comprises a methane tank (16), a carbon dioxide absorbing device (14) and a dehumidifying device (13) which are connected in sequence, wherein the methane tank (16) is connected with an outlet of the heat insulation expansion machine (8); the cold side outlet of the heat accumulation container (3) and the outlet of the dehumidifying device (13) are also connected with a working medium inlet of the internal combustion engine power generation unit; the methane tank (16) comprises a gas buffer chamber (22), a methane generating chamber (23) and a heat exchange chamber (25), wherein the methane generating chamber (23) is arranged below the gas buffer chamber (22), the heat exchange chamber (25) is arranged on the side surface of the methane generating chamber (23), the methane generating chamber (23) is communicated with the gas buffer chamber (22), the gas buffer chamber (22) is communicated with an exhaust port of the heat insulation expander (8), and the methane generating chamber (23) is connected with a carbon dioxide absorption device (14); the gas buffer chamber (22) is connected with the heat exchange chamber (25) through a third throttle valve (11), and the heat exchange chamber (25) is connected with the atmosphere through a fourth throttle valve (26); a gas-liquid heat exchange stirrer (19) and a stirring impeller (20) are arranged in the methane generating chamber (23), and a power impeller (17) is arranged in the gas buffer chamber (22); a gas-liquid heat exchange stirrer inlet pipe (21) is arranged on the gas-liquid heat exchange stirrer (19), and is communicated with a gas buffer chamber (22) through the gas-liquid heat exchange stirrer inlet pipe (21), and a gas-liquid heat exchange stirrer outlet hole (24) is formed in the gas-liquid heat exchange stirrer (19) and is communicated with a methane generating chamber (23) through the gas-liquid heat exchange stirrer outlet hole (24); the power impeller (17) is connected with the stirring impeller (20) through an impeller rotating shaft (18).
2. The system for coupling biomass energy and internal combustion engine according to claim 1, wherein a heat storage container (3) and a first throttling valve (4) are arranged between the heat insulation compressor (2) and the air storage tank (5), and an outlet of the air storage tank (5) is connected with a high-pressure gas inlet of the ejector (7) through a second throttling valve (6).
3. The system for coupling the biomass energy and the internal combustion engine through the compressed air energy storage as claimed in claim 1, wherein the power generation unit of the internal combustion engine comprises an internal combustion engine (12) and a second generator (15), the internal combustion engine (12) is connected with the second generator (15), and a working medium inlet and an exhaust outlet of the internal combustion engine (12) are respectively used as a working medium inlet of the power generation unit of the internal combustion engine and an exhaust outlet of the power generation unit of the internal combustion engine.
4. The system for coupling compressed air energy storage with biomass energy and an internal combustion engine as claimed in claim 1, wherein heat exchange fins (27) are distributed on both sides of the contact wall of the heat exchange chamber (25) of the biogas digester and the biogas generation chamber (23), and the surface of the heat exchange fins (27) in direct contact with the biomass is coated with an anti-corrosion coating.
5. The system for coupling the biomass energy and the internal combustion engine by the compressed air energy storage according to claim 1, wherein the gas outlet holes (24) of the gas-liquid heat exchange stirrer are uniformly formed in the contact surface of the gas-liquid heat exchange stirrer (19) and the biogas generation chamber (23), and the gas-liquid heat exchange stirrer inlet pipes (21) are distributed around the biogas digester (16).
6. The system for coupling biomass energy and internal combustion engine according to claim 1, wherein the carbon dioxide absorption device (14) contains carbon dioxide absorbent, and the dehumidifying device (13) contains desiccant.
7. The method for operating a system for coupling biomass energy and internal combustion engine according to any one of claims 1 to 6, characterised in that during energy storage, air is compressed by the adiabatic compressor (2) and then enters the heat storage container (3), and high-pressure air is discharged in the heat storage container (3) and then enters the air storage tank (5); when energy is released, high-pressure gas in the gas storage tank (5) enters a main working gas inlet of the ejector (7), high-temperature exhaust gas of the internal combustion engine is increased to a set pressure through the booster pump (10) and then enters the ejector (7) to be ejected to the gas inlet, the high-pressure gas and the high-temperature exhaust gas are fully mixed in the ejector (7), the high-pressure gas and the high-temperature exhaust gas maintain the required temperature and pressure in front of the heat-insulation expansion machine (8) and enter the heat-insulation expansion machine (8) to do work, and the heat-insulation expansion machine (8) drives the first generator (9) to generate electricity;
when the electricity consumption peak and the compressed air energy storage system need to release energy, air enters the internal combustion engine power generation unit after being heated by the heat storage container (3), methane gas in the methane generation chamber (23) enters the internal combustion engine power generation unit after being subjected to carbon dioxide removal by the carbon dioxide absorption device (14) and water removal by the dehumidification device (13), and the air and the methane gas in the internal combustion engine power generation unit are mixed and then are combusted to perform energy conversion power generation; the adiabatic expander (8) with excess speed, temperature and pressure exhausts into the biogas digester (16) to assist the biogas digester (16) in operation.
8. The method for operating a system for coupling biomass energy and internal combustion engine according to claim 7, characterized in that the adiabatic expander (8) with excess speed, temperature and pressure exhausts into the gas buffer chamber (22) to rotate the stirring impeller (20) while the power impeller (17) is forced to rotate; one part of gas in the gas buffer chamber (22) enters the heat exchange chamber (25) under the action of pressure difference, is fully subjected to heat exchange with substances in the methane generation chamber (23) and then is discharged to the atmosphere through the fourth throttle valve (26), the other part of gas in the gas buffer chamber (22) enters the gas-liquid heat exchange stirrer (19) through the gas-liquid heat exchange stirrer inlet pipe (21), further enters the methane generation chamber (23) through the gas outlet hole (24) of the gas-liquid heat exchange stirrer, and then enters the carbon dioxide absorption device (14) together with the generated methane gas.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111476752.1A CN114151151B (en) | 2021-12-02 | 2021-12-02 | System for coupling compressed air energy storage with biomass energy and internal combustion engine and operation method |
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