CN114542225A - Device system and method for coupling liquid compressed air energy storage with air separation oxygen-enriched combustion - Google Patents
Device system and method for coupling liquid compressed air energy storage with air separation oxygen-enriched combustion Download PDFInfo
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- CN114542225A CN114542225A CN202210155664.XA CN202210155664A CN114542225A CN 114542225 A CN114542225 A CN 114542225A CN 202210155664 A CN202210155664 A CN 202210155664A CN 114542225 A CN114542225 A CN 114542225A
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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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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B13/00—Oxygen; Ozone; Oxides or hydroxides in general
- C01B13/02—Preparation of oxygen
- C01B13/0229—Purification or separation processes
- C01B13/0248—Physical processing only
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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
- F01K13/006—Auxiliaries or details not otherwise provided for
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B2210/00—Purification or separation of specific gases
- C01B2210/0001—Separation or purification processing
- C01B2210/0009—Physical processing
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
Abstract
The invention provides a device system and a method for coupling liquid compressed air energy storage with air separation oxygen-enriched combustion, wherein the device system comprises an energy storage unit, an air separation unit, an energy release unit, a heat exchange unit and a combustion unit; the energy storage unit, the air separation unit and the energy release unit are sequentially connected; the air separation unit and the combustion unit are connected with each other; the heat exchange unit is used for heat exchange inside each unit and among the units. The method comprises the following steps: (1) introducing ambient air into an energy storage unit for compression and energy storage to obtain compressed air; (2) introducing compressed air into an air separation unit for air separation to obtain oxygen and nitrogen; (3) introducing oxygen into the combustion unit for oxygen-enriched combustion; (4) introducing nitrogen into the energy release unit to perform expansion work; (5) and heat exchange is carried out inside each unit and among the units by utilizing the heat exchange unit. The invention realizes the coupling of the liquid compressed air energy storage system and the thermal power generation system.
Description
Technical Field
The invention belongs to the technical field of compressed air energy storage, relates to a liquid compressed air energy storage device system, and particularly relates to a device system and a method for coupling liquid compressed air energy storage with air separation oxygen-enriched combustion.
Background
The existing liquid compressed air energy storage system has high oxygen content of working media when storing liquid air and performing work and power generation by a turbine, and generally has higher requirements on equipment materials at a temperature of more than 200 ℃ in order to prevent oxygen from corroding the materials, so that the solid investment cost of the whole equipment is multiplied, and the oxygen content of the working media of the liquid compressed air energy storage system needs to be reduced. Meanwhile, the conventional thermal power generating unit is lack of oxygen for combustion, the combustion is insufficient, more harmful gases such as CO and NO are generated, and all heat cannot be fully released.
CN 208024412U discloses a compressed air energy storage system, which comprises an energy storage subsystem and an energy release subsystem; the air compressor, the motor, the heat storage heat exchanger, the air preheater, first heat storage medium pump, low temperature medium storage tank, high temperature medium storage tank, first control valve, compressed air storage tank constitute energy storage subsystem. The heat release heat exchanger, the second heat storage medium pump, the heat exchanger, the air expander, the first generator, the cooler, the carbon dioxide compressor, the heat regenerator, the carbon dioxide turbine, the second generator and the second control valve form an energy release subsystem. The utility model discloses on current compressed air energy storage system's basis, introduce supercritical carbon dioxide circulation and be used for the energy release process to improve the temperature of heat-retaining medium, absorb the heat from the heat-retaining medium through supercritical carbon dioxide circulation, the cold junction waste heat of endless with the sensible heat form refeed compressed air turbine again, improve the energy utilization of energy release process from this, improved compressed air energy storage system's cycle efficiency. However, this compressed air energy storage system does not empty out oxygen, so that corrosion of the plant during long-term use cannot be avoided.
CN 113565590A discloses a compressed air energy storage and coal-fired unit coupled wide-load deep peak shaving power generation system, which comprises a coal-fired power generation subsystem and a compressed air energy storage subsystem connected with the coal-fired power generation subsystem; the compressed air energy storage subsystem comprises a steam turbine unit III, an air compressor system, an indirect cooling system connected with the air compressor system, an energy storage system connected with the indirect cooling system, a heating system connected with the energy storage system, an air turbine system connected with the heating system and a generator I connected with the air turbine system, wherein the steam turbine unit III, the air compressor system, the indirect cooling system connected with the air compressor system, the energy storage system connected with the indirect cooling system, the heating system connected with the energy storage system, the air turbine system connected with the heating system and the generator I are coaxially connected in sequence; and the third steam turbine unit is connected with the coal-fired power generation subsystem. The invention ensures the stable and safe operation of the boiler and the low-load operation of the steam turbine, also recovers redundant energy, and meets the operation requirements of the system on wide load, deep peak regulation and quick load demand response. Although the invention realizes the coupling of the compressed air energy storage system and the power generation system, oxygen in the compressed air cannot be separated out and conveyed to the power generation system for oxygen-enriched combustion.
Therefore, how to realize the coupling of the liquid compressed air energy storage system and the thermal power generation system and separate oxygen in the liquid compressed air and convey the oxygen to the thermal power boiler for oxygen-enriched combustion is realized, so that the problems of oxygen corrosion equipment in the liquid compressed air energy storage system and insufficient boiler combustion, harmful gas emission and low thermal efficiency of a thermal power unit are solved, and the problems which are urgently needed to be solved by technical personnel in the field at present are solved.
Disclosure of Invention
The invention aims to provide a device system and a method for coupling liquid compressed air energy storage with air separation oxygen-enriched combustion, which are used for separating out oxygen in liquid compressed air and conveying the oxygen to a thermoelectric boiler for oxygen-enriched combustion, thereby solving the problems that oxygen in a liquid compressed air energy storage system corrodes equipment, and the boiler of a thermal power generating unit is insufficient in combustion, harmful gas is discharged and the thermal efficiency is low.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a device system for coupling liquid compressed air energy storage with air separation oxygen-enriched combustion.
The energy storage unit, the air separation unit and the energy release unit are sequentially connected.
The air separation unit and the combustion unit are connected to each other.
The heat exchange unit is used for heat exchange inside each unit and among the units.
According to the invention, the air separation unit is arranged between the energy storage unit and the energy release unit, so that oxygen in the liquid compressed air is separated out, the oxygen content of the working medium in the liquid compressed air energy storage system is reduced, the corrosion of oxygen to equipment is avoided, and the service life of the device system is prolonged; simultaneously with air separation unit and combustion unit interconnect, realized that the oxygen that the air separation came out carries to thermal power boiler and carries out the oxygen boosting burning, optimized combustion environment, improved the combustion thermal efficiency, avoided a large amount of emissions of harmful gas. In addition, the heat exchange unit realizes the cyclic utilization of heat in the system, and improves the energy utilization rate and the economic benefit.
Preferably, the energy storage unit comprises at least 3 stages of energy storage sub-units connected in sequence, for example, 3 stages, 4 stages, 5 stages, 6 stages or 7 stages, but not limited to the recited values, and other values not recited in the range of the recited values are also applicable.
Preferably, according to the flowing direction of the air, each stage of energy storage subunit independently comprises a compressor and an intercooler which are connected in sequence, and an air purifier is further connected between the first stage of energy storage subunit and the second stage of energy storage subunit.
Preferably, a cold box is further connected between the energy storage unit and the air separation unit.
Preferably, the air separation unit comprises a cryogenic turbine, a gas-liquid separator, a liquid-air storage tank and an oxygen storage tank which are connected in sequence according to the flowing direction of air.
Preferably, the gas outlet of the gas-liquid separator is connected with the compressor in the second-stage energy storage subunit through a cold box.
Preferably, the nitrogen outlet of the liquid-air storage tank is connected with the energy release unit through a booster pump and an evaporator in sequence.
Preferably, the oxygen storage tank is interconnected to the combustion unit via an air purifier.
Preferably, the energy releasing unit comprises at least 4 energy releasing subunits connected in sequence, for example, 4, 5, 6, 7 or 8 stages, but not limited to the recited values, and other unrecited values in the range of the recited values are also applicable.
Preferably, each stage of the energy release subunit independently comprises a heater and an air turbine which are connected in sequence according to the flow direction of the air.
Preferably, the heat exchange unit comprises a cold accumulation packed bed, a heat conduction oil cold accumulation tank and a heat conduction oil heat accumulation tank.
Preferably, the cold box and the evaporator are respectively and independently connected with the cold accumulation packed bed in parallel.
Preferably, the heat-conducting oil cold storage tank and the heat-conducting oil heat storage tank are respectively and independently connected in series with the intercoolers in each stage of energy storage subunit.
In the invention, the heat conduction oil in the heat conduction oil cold storage tank flows through the intercoolers in each stage of energy storage subunit to carry out interstage cooling and flows back to the heat conduction oil heat storage tank.
Preferably, the heat-conducting oil cold storage tank and the heat-conducting oil heat storage tank are respectively and independently connected in series with the heater in each level of energy release subunit.
In the invention, the heat conduction oil in the heat conduction oil heat storage tank flows through the heater in each stage of energy release subunit to carry out interstage heating and flows back to the heat conduction oil cold storage tank.
Preferably, the cold accumulation packed bed is also connected with the oxygen storage tank in parallel and used for recovering cold in the oxygen storage tank.
Preferably, the combustion unit comprises a coal-fired boiler.
In a second aspect, the present invention provides a method for liquid compressed air energy storage coupled air separation oxygen-enriched combustion using the apparatus system according to the first aspect, the method comprising the following steps:
(1) introducing ambient air into an energy storage unit for compression and energy storage to obtain compressed air;
(2) introducing the compressed air obtained in the step (1) into an air separation unit for air separation to obtain oxygen and nitrogen;
(3) introducing the oxygen obtained in the step (2) into a combustion unit for oxygen-enriched combustion;
(4) introducing the nitrogen obtained in the step (2) into an energy release unit to perform expansion work;
(5) and heat exchange is carried out inside each unit and among the units by utilizing the heat exchange unit.
Wherein, the step (3) and the step (4) are carried out simultaneously.
Preferably, the compressed energy storage of step (1) comprises at least 3 stages of compression, and each stage of compression is followed by interstage cooling.
Preferably, gas-liquid separation is also performed before the air separation in the step (2), and the obtained air is returned to the step (1) for compression and energy storage.
Preferably, the air separation in the step (2) is used for separating oxygen and nitrogen through temperature control.
Preferably, the oxygen in the step (3) passes through an air purifier before being introduced into the combustion unit, and the air purifier is subjected to purging cleaning.
Preferably, the oxygen in the step (3) is also subjected to cold recovery before being introduced into the combustion unit.
Preferably, the expansion work of step (4) includes at least 4 stages of expansion processes, and interstage heating is performed before each stage of expansion process.
Preferably, the heat exchange in the step (5) utilizes heat conduction oil to carry out interstage cooling in the step (1) and interstage heating in the step (4).
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the device system, the air separation unit is arranged between the energy storage unit and the energy release unit, so that oxygen in the liquid compressed air is separated out, the oxygen content of the working medium in the liquid compressed air energy storage system is reduced, the corrosion of the oxygen to equipment is avoided, and the service life of the device system is prolonged;
(2) the air separation unit and the combustion unit are connected with each other, so that oxygen separated out by air is conveyed to the thermal power boiler for oxygen-enriched combustion, the combustion environment is optimized, the combustion heat efficiency is improved, and the large-amount emission of harmful gas is avoided;
(3) the arrangement of the heat exchange unit in the device system provided by the invention realizes the cyclic utilization of heat in the system, and improves the energy utilization rate and economic benefits.
Drawings
FIG. 1 is a schematic structural diagram of a device system for coupling liquid compressed air energy storage with air separation oxygen-enriched combustion provided in embodiment 1;
FIG. 2 is a schematic structural diagram of a device system for coupling liquid compressed air energy storage with air separation oxygen-enriched combustion provided in embodiment 2;
FIG. 3 is a schematic structural diagram of a device system for coupling liquid compressed air energy storage with air separation oxygen-enriched combustion provided in embodiment 3.
Wherein: 10-an energy storage unit; 11-a compressor; 12-an intercooler; 13-an air purifier; 14-a cold box; 20-an air separation unit; 21-a cryogenic turbine; 22-gas-liquid separator; 23-liquid empty tank; 24-an oxygen storage tank; 25-a booster pump; 26-an evaporator; 27-a flow divider; 30-an energy releasing unit; 31-a heater; 32-an air turbine; 40-a heat exchange unit; 41-cold accumulation packed bed; 42-heat conducting oil cold storage tank; 43-heat conducting oil heat storage tank; 50-combustion unit.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
Example 1
The embodiment provides a device system for coupling liquid compressed air energy storage with air separation oxygen-enriched combustion, as shown in fig. 1, the device system comprises an energy storage unit 10, an air separation unit 20, an energy release unit 30, a heat exchange unit 40 and a combustion unit 50; the energy storage unit 10, the air separation unit 20 and the energy release unit 30 are connected in sequence, the air separation unit 20 and the combustion unit 50 are connected with each other, and the heat exchange unit 40 is used for heat exchange inside each unit and among each unit.
In this embodiment, energy storage unit 10 is including the 3 grades of energy storage subelements that connect gradually, and according to the flow direction of air, each grade of energy storage subelement is respectively independently including the compressor 11 and the intercooler 12 that connect gradually, and still is connected with air purifier 13 between first order energy storage subelement and the second grade energy storage subelement, still be connected with cold box 14 between energy storage unit 10 and the empty unit 20 that divides.
In this embodiment, the air separation unit 20 includes a cryogenic turbine 21, a gas-liquid separator 22, a liquid-air storage tank 23, and an oxygen storage tank 24, which are connected in this order, in accordance with the flow direction of air. The gas outlet of the gas-liquid separator 22 is connected with the compressor 11 in the second-stage energy storage subunit through the cold box 14; the nitrogen outlet of the liquid-air storage tank 23 is connected with an energy release unit 30 through a booster pump 25 and an evaporator 26 in sequence; the oxygen storage tank 24 is interconnected with the combustion unit 50 via an air purifier 13, and the air purifier 13 is in particular a recyclable air purifier.
In this embodiment, the energy releasing unit 30 includes 4 stages of energy releasing subunits connected in sequence, and each stage of energy releasing subunit independently includes a heater 31 and an air turbine 32 connected in sequence according to the flow direction of the air.
In this embodiment, the heat exchange unit 40 includes a cold accumulation packed bed 41, a heat conduction oil cold accumulation tank 42, and a heat conduction oil heat accumulation tank 43. The cold box 14 and the evaporator 26 are respectively and independently connected with the cold accumulation packed bed 41 in parallel; the heat conducting oil cold storage tank 42 and the heat conducting oil heat storage tank 43 are respectively and independently connected in series with the intercooler 12 in each stage of energy storage subunit and the heater 31 in each stage of energy release subunit.
In this embodiment, the combustion unit 50 is specifically a coal-fired boiler.
Example 2
In this embodiment, a device system for coupling liquid compressed air energy storage with air separation oxygen-enriched combustion is provided, as shown in fig. 2, except that an oxygen storage tank 24 is directly connected to a combustion unit 50, and the rest of the structure and conditions are the same as those in embodiment 1, and therefore, the detailed description thereof is omitted.
Example 3
The present embodiment provides a device system for coupling liquid compressed air energy storage with air separation oxygen-enriched combustion, as shown in fig. 3, except that a cold storage packed bed 41 and an oxygen storage tank 24 are connected in parallel, and a flow divider 27 is added, the other structures and conditions are the same as those in embodiment 2, and therefore, the detailed description thereof is omitted.
Application example 1
The device system provided by the application example 1 is used for liquid compressed air energy storage coupling air separation oxygen-enriched combustion, and the specific method comprises the following steps:
(1) introducing ambient air into the energy storage unit 10 for compression and energy storage to obtain compressed air;
(2) introducing the compressed air obtained in the step (1) into an air separation unit 20 for air separation to obtain oxygen and nitrogen;
(3) introducing the oxygen obtained in the step (2) into a combustion unit 50 for oxygen-enriched combustion;
(4) introducing the nitrogen obtained in the step (2) into an energy release unit 30 to perform expansion work;
(5) heat exchange is carried out inside each unit and among the units by utilizing the heat exchange unit 40;
wherein, the step (3) and the step (4) are carried out simultaneously.
In the application example, the compression energy storage in the step (1) comprises 3 stages of compression processes, and interstage cooling is performed after each stage of compression process; performing gas-liquid separation before air separation in the step (2), returning the obtained air to the step (1) for compression energy storage, and performing separation of oxygen and nitrogen by the air separation through temperature control; the oxygen in the step (3) passes through an air purifier 13 before being introduced into the combustion unit 50, and the air purifier 13 is purged and cleaned; the expansion work of the step (4) comprises 4 stages of expansion processes, and interstage heating is carried out before each stage of expansion process; and (5) performing interstage cooling in the step (1) and interstage heating in the step (4) by heat exchange through heat conduction oil.
Specifically, ambient air enters the energy storage unit through the compressor 11, interstage cooling is completed by the intercooler 12, cold energy of the heat-conducting oil cold storage tank 42 is absorbed, heat is stored in the heat-conducting oil heat storage tank 43, and the process is repeated for 2 times to obtain compressed air. The obtained compressed air absorbs cold energy through the cold box 14, then is expanded by the low-temperature turbine 21 to do work, generates electric energy and reaches a critical state of 0.8MPa and 170 ℃ below zero, gas-liquid separation is carried out in the gas-liquid separator 22, the obtained air returns to the compressor 11 in the second-stage energy storage subunit through the cold box 14, the obtained liquid air enters the liquid air storage tank 23 for storage, and oxygen and nitrogen are separated from each other by controlling the temperature of the liquid air storage tank 23. Wherein the obtained oxygen is stored in the oxygen storage tank 24, and after the system is charged, the air purifier 13 is purged and cleaned by using the oxygen and flows to the combustion unit 50 with impurities; during discharging, the pressure of the residual nitrogen is increased by the booster pump 25, the cold energy is recovered by the evaporator 26, the nitrogen is converted from liquid state to gas state, the heat of the compressor 11 is recovered by the heater 31 in the energy release unit 30 to increase the air inlet parameter, and the air turbine 32 does work and generates electricity.
The low-temperature heat conducting oil in the heat conducting oil cold storage tank 42 is divided into three streams of fluid, the three streams of fluid respectively enter the intercooler 12 in each stage of energy storage subunit to absorb heat and simultaneously complete interstage cooling of compressed air, the three streams of fluid are collected in the heat conducting oil heat storage tank 43 to be stored, the heat is supplied to a heat user through a heat exchanger to be used, and circulation is completed; similarly, the heat exchange process of the energy release unit 30 is opposite to the above process, and therefore, the detailed description thereof is omitted.
Application example 2
In this application example, the device system provided in embodiment 2 is applied to perform air separation oxygen-enriched combustion by coupling liquid compressed air energy storage, except that the oxygen in the oxygen storage tank 24 is directly introduced into the combustion unit 50, and other steps and conditions are the same as those in embodiment 1, and therefore, detailed description thereof is omitted.
Application example 3
In this application example, the device system provided in embodiment 2 is applied to perform air separation oxygen-enriched combustion by coupling liquid compressed air energy storage, except that the gas flow and temperature in the oxygen storage tank 24 and the evaporator 26 are fed back to the flow divider 27, and the cold energy in the oxygen storage tank 24 and the evaporator 26 is taken away by the cold storage medium and collected in the cold storage packed bed 41, and the other steps and conditions are the same as those in embodiment 2, and therefore are not described herein again.
Therefore, the air separation unit is arranged between the energy storage unit and the energy release unit, so that oxygen in the liquid compressed air is separated out, the oxygen content of the working medium in the liquid compressed air energy storage system is reduced, the corrosion of the oxygen to equipment is avoided, and the service life of the device system is prolonged; simultaneously with air separation unit and combustion unit interconnect, realized that the oxygen that the air separation came out carries to thermal power boiler and carries out the oxygen boosting burning, optimized combustion environment, improved the combustion thermal efficiency, avoided a large amount of emissions of harmful gas. In addition, the heat exchange unit realizes the cyclic utilization of heat in the system, and improves the energy utilization rate and the economic benefit.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.
Claims (10)
1. A device system for coupling liquid compressed air energy storage with air separation oxygen-enriched combustion is characterized by comprising an energy storage unit, an air separation unit, an energy release unit, a heat exchange unit and a combustion unit;
the energy storage unit, the air separation unit and the energy release unit are sequentially connected;
the air separation unit and the combustion unit are connected with each other;
the heat exchange unit is used for heat exchange inside each unit and among the units.
2. The device system of claim 1, wherein the energy storage unit comprises at least 3 stages of energy storage sub-units connected in sequence;
preferably, each stage of energy storage subunit independently comprises a compressor and an intercooler which are sequentially connected according to the flowing direction of air, and an air purifier is further connected between the first stage of energy storage subunit and the second stage of energy storage subunit;
preferably, a cold box is further connected between the energy storage unit and the air separation unit.
3. The plant system as claimed in claim 2, wherein the air separation unit comprises a cryogenic turbine, a gas-liquid separator, a liquid air storage tank and an oxygen storage tank connected in sequence according to the flow direction of air;
preferably, the gas outlet of the gas-liquid separator is connected with the compressor in the second-stage energy storage subunit through a cold box;
preferably, a nitrogen outlet of the liquid-air storage tank is connected with the energy release unit sequentially through a booster pump and an evaporator;
preferably, the oxygen storage tank is interconnected to the combustion unit via an air purifier.
4. The device system according to claim 3, wherein the energy releasing unit comprises at least 4 stages of energy releasing subunits connected in sequence;
preferably, each stage of the energy release subunit independently comprises a heater and an air turbine which are connected in sequence according to the flow direction of the air.
5. The device system of claim 4, wherein the heat exchange unit comprises a cold storage packed bed, a heat transfer oil cold storage tank and a heat transfer oil heat storage tank;
preferably, the cold box and the evaporator are respectively and independently connected with the cold accumulation packed bed in parallel;
preferably, the heat-conducting oil cold storage tank and the heat-conducting oil heat storage tank are respectively and independently connected in series with the intercoolers in each stage of energy storage subunit;
preferably, the heat-conducting oil cold storage tank and the heat-conducting oil heat storage tank are respectively and independently connected in series with the heater in each level of energy release subunit.
6. The device system as claimed in claim 5, wherein the cold accumulation packed bed is also connected with the oxygen storage tank in parallel for recovering cold in the oxygen storage tank;
preferably, the combustion unit comprises a coal-fired boiler.
7. A method for coupling liquid compressed air energy storage with air separation oxygen-enriched combustion by using the device system as claimed in any one of claims 1-6, characterized in that the method comprises the following steps:
(1) introducing ambient air into an energy storage unit for compression and energy storage to obtain compressed air;
(2) introducing the compressed air obtained in the step (1) into an air separation unit for air separation to obtain oxygen and nitrogen;
(3) introducing the oxygen obtained in the step (2) into a combustion unit for oxygen-enriched combustion;
(4) introducing the nitrogen obtained in the step (2) into an energy release unit to perform expansion work;
(5) heat exchange is carried out inside each unit and among the units by utilizing the heat exchange unit;
wherein, the step (3) and the step (4) are carried out simultaneously.
8. The method of claim 7 wherein the compressed stored energy of step (1) comprises at least 3 stages of compression, each stage of compression being followed by interstage cooling;
preferably, gas-liquid separation is also carried out before the air separation in the step (2), and the obtained air is returned to the step (1) for compression and energy storage;
preferably, the air separation in the step (2) is used for separating oxygen and nitrogen through temperature control.
9. The method of claim 8, wherein the oxygen of step (3) is further passed through an air purifier before being passed to the combustion unit, and the air purifier is subjected to purge cleaning;
preferably, the oxygen in the step (3) is also subjected to cold recovery before being introduced into the combustion unit.
10. The method of claim 9 wherein said work of expansion of step (4) comprises at least 4 stages of expansion and interstage heating prior to each stage of expansion;
preferably, the heat exchange in the step (5) utilizes heat conduction oil to carry out interstage cooling in the step (1) and interstage heating in the step (4).
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| CN108443018A (en) * | 2018-05-08 | 2018-08-24 | 东南大学 | Gas turbine power generation peak regulation system based on liquid air energy storage technology |
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| CN109412183A (en) * | 2018-11-22 | 2019-03-01 | 西安热工研究院有限公司 | A kind of integrated power generation system and method for combining oxygen-enriched combusting and liquid oxygen energy storage |
| CN111022139A (en) * | 2019-11-27 | 2020-04-17 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Coal-fired generating set coupling liquefied air energy storage power generation system |
| CN213574689U (en) * | 2020-10-27 | 2021-06-29 | 西安热工研究院有限公司 | System for improving conversion efficiency of liquid compressed air energy storage system |
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