CN113531944B - Double-effect three-phase energy storage and absorption type refrigerating system - Google Patents
Double-effect three-phase energy storage and absorption type refrigerating system Download PDFInfo
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- CN113531944B CN113531944B CN202110708614.5A CN202110708614A CN113531944B CN 113531944 B CN113531944 B CN 113531944B CN 202110708614 A CN202110708614 A CN 202110708614A CN 113531944 B CN113531944 B CN 113531944B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B15/00—Sorption machines, plants or systems, operating continuously, e.g. absorption type
- F25B15/02—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas
- F25B15/06—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas the refrigerant being water vapour evaporated from a salt solution, e.g. lithium bromide
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S60/00—Arrangements for storing heat collected by solar heat collectors
- F24S60/30—Arrangements for storing heat collected by solar heat collectors storing heat in liquids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B27/00—Machines, plants or systems, using particular sources of energy
- F25B27/002—Machines, plants or systems, using particular sources of energy using solar energy
- F25B27/007—Machines, plants or systems, using particular sources of energy using solar energy in sorption type systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/003—Filters
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
- Y02A30/272—Solar heating or cooling
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/20—Solar thermal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
Abstract
A double-effect three-phase energy storage and absorption type refrigerating system belongs to the field of solar heat pumps. The invention provides a double-effect three-phase energy storage and absorption type refrigerating system, which overcomes the danger brought by the crystallization of the solution of the traditional solar absorption type heat pump, realizes the load adjustment effect of the energy storage system on the solar heat pump by the high energy storage density of the gas-liquid-solid three phase of the lithium bromide water solution, enhances the three-phase energy storage capacity, obviously improves the energy storage density compared with a gas-liquid two-phase energy storage mode, improves the energy storage density by more than 50 percent by the crystallization rate of 50 percent, in other words, reduces the volume of an energy storage device by more than half by the crystallization rate of 50 percent, realizes double-effect energy storage on the basis of the three-phase energy storage, can realize synchronous refrigeration and energy storage, stores energy in the daytime, releases energy at night, runs all day by the system, can further improve the utilization rate of solar energy, and has high practical value in the field of building energy conservation.
Description
Technical Field
The invention belongs to the technical field of solar heat pumps, and particularly relates to a double-effect three-phase energy storage and absorption type refrigerating system running all day long.
Background
The application of solar energy in the air conditioning field is a relatively common technology, and the application of a solar absorption refrigeration air conditioning system is particularly common. Compared with the traditional single-effect lithium bromide absorption refrigeration, the double-effect machine can more effectively utilize a high-temperature heat source and improve the performance of the refrigerating machine. In order to improve the utilization rate of solar energy, an energy storage technology is combined with a solar double-effect lithium bromide absorption refrigerating unit, so that the efficiency of the solar refrigeration air conditioner is further improved. The basic heat storage modes of the energy storage device of the solar absorption refrigeration air conditioner mainly comprise sensible heat type heat storage, latent heat type heat storage and thermochemical type heat storage. Sensible heat and latent heat (phase change) energy storage technology is the most widely researched and applied energy storage technology, the development of the sensible heat and latent heat (phase change) energy storage technology is mature, but thermochemical energy storage technology is still in the stages of theoretical exploration and laboratory research at present. As one of thermochemical energy storage technologies, the chemical solution three-phase energy storage technology based on the absorption principle has the advantages of high energy storage density, small heat loss and the like, and has important significance for improving energy efficiency and protecting the environment. In order to further explore the potential of solution energy storage and improve the energy storage density of a solution energy storage device, the invention provides a double-effect three-phase energy storage and absorption refrigeration system, which utilizes a lithium bromide-water solution as an energy storage medium, and arranges a high-pressure and low-pressure two-stage heat storage solution tank on the basis of three-phase energy storage, so that the energy storage capacity is further enhanced, the energy is stored in the daytime, the energy is released at night, the system operates all day, and the utilization rate of solar energy is further improved.
Disclosure of Invention
The invention provides a double-effect three-phase energy storage and absorption refrigeration system running all day long, wherein the three-phase energy storage adopts lithium bromide-water solution as an energy storage medium, the three-phase energy storage technology overcomes the danger caused by the crystallization of the solution of the traditional solar absorption heat pump, and the load regulation effect of the energy storage system on a solar heat pump is realized by the high energy storage density of vapor-liquid-solid three phases. The energy storage system adopts two-stage energy storage solution tanks, so that the energy storage efficiency is further improved. Meanwhile, the system is operated all day long, solar energy is efficiently utilized, and the solution in the double-effect three-phase energy storage solution tank is continuously heated and crystallized in the daytime until the energy storage is finished; the dilute solution from the absorber continuously dissolves the lithium bromide crystals at night until the end of the energy release.
A double-effect three-phase energy storage and absorption refrigeration system is characterized in that: the system comprises a solar trough type heat collector 1, an oil storage tank 2, a high-pressure energy storage solution tank 3, a low-pressure energy storage solution tank 4, a water storage tank 5, an absorber 6, an evaporator 7, a condenser 8, a high-pressure generator 9, a low-pressure generator 10 and a cooling tower 11.
The solar trough heat collector 1, the oil storage tank 2 and the sixth circulating pump P6 form a loop for heating a heat collecting medium, namely heat conducting oil. The oil storage tank 2 is respectively connected with the high-pressure energy storage solution tank 3 and the heat exchanger in the high-pressure generator 9 to form a heat collection medium circulation loop. The seventh valve three-way valve V7 between the oil storage tank 2 and the high-pressure energy storage solution tank 3 is opened when the temperature of the heat transfer oil reaches 200 ℃ and flows into the energy storage system end. The solution in the high-pressure energy storage solution tank 3 is continuously sprayed on the internal heat exchanger through the first circulating pump P1 and the first valve V1. The high pressure generator 9 is connected with a heat exchanger in the low pressure generator 10, refrigerant steam generated by the high pressure generator 9 and refrigerant steam generated by the low pressure generator 10 enter the condenser 8 through a pipeline connected with the condenser 8 through the heat exchanger in the low pressure generator 10 and a pipeline above the low pressure generator 10 respectively after heat exchange, and the cooling tower 11 is connected with the condenser 8 to provide cooling water condensation refrigerant steam. The refrigerant enters the evaporator 7 through a fifth valve throttle valve V5, and is delivered by a fifth circulating pump P5 to be sprayed on the surface of the heat exchanger, thereby cooling the chilled water delivered from the cooling area. The solution heated and concentrated in the high-pressure generator and the low-pressure generator enters the absorber 6 through the heat exchanger and the sixth valve V6 to absorb refrigerant vapor from the evaporator 7, is condensed into dilute solution by cooling water conveyed by the condenser 8, provides circulating power through the fourth circulating pump P4, and returns to the high-pressure generator 9 and the low-pressure generator 10 after being shunted again. The high-pressure energy storage solution tank 3, the low-pressure energy storage solution tank 4 and the absorber 6 form a solution circulation loop, concentrated solution in the two solution tanks enters the absorber 6 through an eighth valve V8 and is sprayed on the surface of the heat exchanger through a solution nozzle, and the concentrated solution absorbs water vapor from the evaporator 7 in the absorber 6 to be diluted into dilute solution. And returned to the high-pressure solution tank 3 and the low-pressure solution tank 4, respectively, via a fourth circulation pump P4 and a fourth valve V4. The high-pressure solution tank 3 is connected with the heat exchanger in the low-pressure solution tank 4 through a pipeline, the heat exchange medium is refrigerant steam generated in the high-pressure solution tank 3 and used for heating the solution in the low-pressure energy storage solution tank 4, and the solution is continuously sprayed on the heat exchanger through a second circulating pump P2 and a third valve V3. The heat exchange medium enters the water storage tank 5 through a pipeline after releasing heat, steam generated after the solution in the low-pressure energy storage solution tank 4 is heated also enters the water storage tank 5 through an upper pipeline, all cooling water circulated from the cooling tower 11 is condensed into liquid, the cooling tower 11 is connected with a heat exchanger in the water storage tank 5 through a pipeline, and the liquid water in the water storage tank 5 is sprayed on the internal heat exchanger through a third circulating pump P3 and a third valve V3 and is continuously cooled. The refrigerant in the water storage tank 5 enters the evaporator 7 through the third circulating pump P3, the ninth valve V9 and the fifth valve throttle valve V5, and is sprayed on the surface of the heat exchanger in the evaporator 7 through the nozzle.
The groove type solar heat collection system is a driving heat source of the whole system and provides heat for the double-effect absorption refrigerator and the double-effect three-phase absorption energy storage system. Day mode: an eighth valve V8 and a tenth valve V10 on a solution loop formed by the high-pressure energy storage solution tank 3, the low-pressure energy storage solution tank 4 and the absorber 6 and a ninth valve V9 between the water storage tank 5 and the evaporator 7 are closed, a first valve V1 connected with the high-pressure energy storage solution tank 3, a second valve V2 connected with the low-pressure energy storage solution tank 4, a third valve V3 connected with the water storage tank 5, a fourth valve V4 at the solution outflow end of the absorber 6, a fifth valve throttle valve V5 and a sixth valve V6 at the solution inflow end of the absorber 6 are opened, and the groove type solar collector 1 absorbs solar energy to heat conduction oil. When the heat conducting oil reaches the set temperature of the system, the seventh valve V7 is opened to provide heat for the absorption refrigerator, and the refrigerator starts to work for refrigeration. When the temperature in the oil storage tank 2 exceeds 200 ℃, the seventh valve, the three-way valve V7, flows into the energy storage system end and is opened, the surplus heat is conveyed to the double-effect three-phase energy accumulator, the first pump P1 and the second pump P2 are opened, and the energy accumulator is opened in an energy storage mode. The lithium bromide solution in the high-pressure solution tank 3 is continuously sprayed on a heat source pipe cluster of the solution tank through a first circulating pump P1, the solution is heated to raise temperature to generate steam, the temperature and the concentration of the solution are gradually raised along with the continuous cyclic heating of the solution to generate steam, lithium bromide crystals begin to precipitate after the solution reaches a crystallization state point, and the precipitated crystals are separated from the solution after being filtered by a filter screen; the generated steam enters a low-pressure solution tank 4 to heat the lithium bromide solution, so that the lithium bromide solution is concentrated and crystallized, and the residual solutions in the two solution tanks are continuously sprayed circularly, heated by a heat source and separated out crystals until the energy storage is finished; the water vapor generated by the high-pressure solution tank 3 is condensed into water after heat release, and enters the water storage tank 5 together with the water vapor generated by the low-pressure solution tank 4, and the water vapor is cooled by cooling water to become liquid refrigerant water and is stored in the water storage tank 5 in a liquid form. Night mode: and opening the eighth valve V8, the ninth valve V9 and the tenth valve V10, closing the first valve V1, the second valve V2, the third valve V3, the fourth valve V4 and the sixth valve V6, and stopping the operation of the trough-type solar collector 1. The high-low generator and the condenser 8 of the absorption refrigerator stop running, the first circulating pump P1, the second circulating pump P2, the third circulating pump P3, the fourth circulating pump P4 and the fifth circulating pump P5 are still started, and the double-effect three-phase energy accumulator is started to release energy. Liquid refrigerant water in the water storage tank 5 is conveyed to the evaporator 7 by a third circulating pump P3, and the refrigerant water is evaporated in the evaporator 7 to absorb heat and changed into water vapor to enter the absorber 6; the lithium bromide concentrated solution absorbs the water vapor from the evaporator 7 to become hot dilute solution, and the dilute solution is respectively conveyed to the two solution tanks through the fourth circulating pump P4 to continuously dissolve lithium bromide crystals, so that the solution concentration is continuously reduced until the energy release is finished, and the initial state of the energy storage system is recovered.
Furthermore, the energy storage of the system realizes double-effect energy storage on the basis of gas-liquid-solid three-phase energy storage, the heat conduction oil in the solar trough collector 1 absorbs solar energy to provide heat for the double-effect three-phase energy storage, and the energy is stored in the high-pressure solution tank 3 and the low-pressure solution tank 4 in the form of chemical potential energy of lithium bromide aqueous solution. Specifically, when the three-phase energy storage system stores energy, the solar heat collecting medium directly provides heat for the double-effect three-phase energy storage tank, the lithium bromide aqueous solution in the high-pressure solution tank 3 is heated, the generated water vapor continues to heat the lithium bromide aqueous solution in the low-pressure solution tank 4, the water separated from the two solution tanks enters the water storage tank 5 to be condensed into liquid, and meanwhile, the heat is stored in the energy storage tank in the form of chemical potential energy of the lithium bromide aqueous solution. When the double-effect three-phase energy storage system is started to release energy, liquid water in the water storage tank 5 is subjected to pressure reduction through the throttling device and then enters the evaporator 7, the liquid water is heated by a heat-carrying medium in the heat exchanger in the evaporator 7 to be vaporized, water vapor enters the absorber 6, meanwhile, a lithium bromide concentrated solution in the double-effect three-phase energy storage tank also flows to the absorber 6 to absorb the water vapor from the evaporator 7, and then a diluted lithium bromide solution in the absorber 7 flows back to the double-effect three-phase energy storage tank to be dissolved continuously, and lithium bromide crystals precipitated by heating are separated out.
The invention is also characterized in that: the double-effect three-phase energy storage and absorption refrigeration system capable of operating all day long is provided, the double-effect three-phase energy storage system is utilized, the energy storage capacity is enhanced, the energy storage density is obviously improved compared with a simple gas-liquid-solid three-phase energy storage mode, energy is stored while refrigeration is carried out in the day, the energy is released to continue refrigeration at night, the system operates all day long, and the solar energy utilization rate is effectively improved.
Advantageous effects
The invention provides a double-effect three-phase energy storage and absorption refrigeration system, wherein the three-phase energy storage technology overcomes the danger brought by the traditional solar absorption heat pump solution crystallization, the load adjustment effect of the energy storage system on a solar heat pump is realized by the high energy storage density of lithium bromide aqueous solution, namely, vapor, liquid and solid, the three-phase energy storage capacity is enhanced, the energy storage density is obviously improved compared with a gas-liquid two-phase energy storage mode, the energy storage density can be improved by more than 50% by 50% of crystallization rate, in other words, the crystallization rate of 50% is reduced by more than half by the volume of an energy storage device, double-effect energy storage is realized on the basis of three-phase energy storage, the system can realize synchronous refrigeration and energy storage, the energy storage is realized in the daytime, the energy is released at night, the system runs all day, the solar energy utilization rate can be further improved, and the double-effect energy storage refrigeration system has high practical value in the field of building energy conservation.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
In the figure: the parts are numbered and named as follows:
1-solar trough type heat collector; 2-an oil storage tank; 3-high pressure energy storage solution tank; 4-low pressure energy storage solution tank; 5, a water storage tank; 6-an absorber; 7-an evaporator; 8, a condenser; 9-high voltage generator; 10-a low pressure generator; 11-cooling tower
Detailed Description
The invention is further described with reference to the following figures.
An absorption refrigeration working medium pair lithium bromide-water solution is adopted as an energy storage medium. In the daytime, the eighth valve V8, the tenth valve V10 and the ninth valve V9 are closed, the first valve V1, the second valve V2, the third valve V3, the fourth valve V4, the fifth valve throttle valve V5 and the sixth valve V6 are opened, and the groove type solar heat collector 1 absorbs solar energy to heat conduction oil. When the heat conducting oil reaches the set temperature of the system, the seventh valve V7 is opened to provide heat for the absorption refrigerator, and the refrigerator starts to work for refrigeration. When the temperature in the oil storage tank 2 exceeds 200 ℃, the seventh valve, the three-way valve V7, flows into the energy storage system end and is opened, the surplus heat is conveyed to the double-effect three-phase energy accumulator, the first pump P1 and the second pump P2 are opened, and the energy accumulator is opened in an energy storage mode. The lithium bromide solution in the high-pressure solution tank 3 is continuously sprayed on a heat source pipe bundle of the solution tank through a first circulating pump P1, the solution is heated to raise the temperature and generate steam, the solution is continuously heated in a circulating manner, the temperature and the concentration of the solution are gradually raised along with the generation of steam, lithium bromide crystals begin to precipitate after reaching a crystallization state point, and the precipitated crystals are separated from the solution after being filtered by a filter screen; the generated steam enters a low-pressure solution tank 4 to heat the lithium bromide solution, so that the lithium bromide solution is concentrated and crystallized, and the residual solutions in the two solution tanks are continuously sprayed circularly, heated by a heat source and separated out crystals until the energy storage is finished; the water vapor generated by the high-pressure solution tank 3 is condensed into water after heat release, and enters the water storage tank 5 together with the water vapor generated by the low-pressure solution tank 4, and the water vapor is cooled by cooling water to become liquid refrigerant water and is stored in the water storage tank 5 in a liquid form. At night, the eighth valve V8, the ninth valve V9 and the tenth valve V10 are opened, the first valve V1, the second valve V2, the third valve V3, the fourth valve V4 and the sixth valve V6 are closed, and the operation of the trough solar collector 1 is stopped. The high and low generators and the condenser 8 of the absorption refrigerator stop running, and the double-effect three-phase energy accumulator starts an energy release mode. The liquid refrigerant water in the water storage tank 5 is conveyed to the evaporator 7 by a third circulating pump P3, and the refrigerant water is evaporated in the evaporator 7 to absorb heat and is changed into water vapor to enter the absorber 6; the lithium bromide concentrated solution absorbs the water vapor from the evaporator 7 to become hot dilute solution, and the dilute solution is respectively conveyed to the two solution tanks through the fourth circulating pump P4 to continuously dissolve lithium bromide crystals, so that the solution concentration is continuously reduced until the energy release is finished, and the initial state of the energy storage system is recovered.
Claims (2)
1. A double-effect three-phase energy storage and absorption refrigeration system comprises a solar trough type heat collector (1), an oil storage tank (2), a high-pressure energy storage solution tank (3), a low-pressure energy storage solution tank (4), a water storage tank (5), an absorber (6), an evaporator (7), a condenser (8), a high-pressure generator (9), a low-pressure generator (10) and a cooling tower (11); the solar trough type heat collector (1) and the oil storage tank (2) form a loop through a sixth circulating pump (P6) and are used for heating heat conduction oil; the oil storage tank (2) is respectively connected with the high-pressure energy storage solution tank (3) and a heat exchanger in the high-pressure generator (9) to form a heat conduction oil circulation loop; a seventh valve three-way valve (V7) between the oil storage tank (2) and the high-pressure energy storage solution tank (3) is opened when the temperature of the heat transfer oil reaches 290 ℃; the lithium bromide water solution in the high-pressure energy storage solution tank (3) is continuously sprayed on the heat exchanger inside the high-pressure energy storage solution tank through a first circulating pump (P1) and a first valve (V1); the high-pressure generator (9) is connected with a heat exchanger in the low-pressure generator (10), refrigerant steam generated by the high-pressure generator (9) and refrigerant steam generated by the low-pressure generator (10) enter the condenser (8) through a pipeline connected with the condenser (8) in the heat exchanger in the low-pressure generator (10) and a pipeline above the low-pressure generator (10) respectively after heat exchange, and the cooling tower (11) is connected with the condenser (8) to provide cooling water to condense the refrigerant steam into liquid refrigerant; the liquid refrigerant enters an evaporator (7) through a fifth valve throttle valve (V5), is conveyed by a fifth circulating pump (P5) to be sprayed on the surface of the heat exchanger, and cools chilled water conveyed from a cooling area; the lithium bromide aqueous solution heated and concentrated in the high-pressure generator (9) and the low-pressure generator (10) enters an absorber (6) through a heat exchanger and a sixth valve (V6) to absorb refrigerant steam from the evaporator (7), is condensed by cooling water conveyed by a cooling tower to become dilute lithium bromide aqueous solution, provides circulating power through a fourth circulating pump (P4), and returns to the high-pressure generator (9) and the low-pressure generator (10) after being shunted again; a lithium bromide aqueous solution circulation loop is formed by the high-pressure energy storage solution tank (3), the low-pressure energy storage solution tank (4) and the absorber (6), concentrated lithium bromide aqueous solution in the high-pressure energy storage solution tank (3) and the low-pressure energy storage solution tank (4) enters the absorber (6) through an eighth valve (V8) and is sprayed on the surface of the heat exchanger through a nozzle, and the concentrated lithium bromide aqueous solution absorbs refrigerant steam from the evaporator (7) in the absorber (6) to be diluted into dilute lithium bromide aqueous solution; respectively reflows to the high-pressure energy storage solution tank (3) and the low-pressure energy storage solution tank (4) through a fourth circulating pump (P4) and a tenth valve (V10); the high-pressure energy storage solution tank (3) is connected with a heat exchanger in the low-pressure energy storage solution tank (4) through a pipeline, a heat exchange medium is refrigerant steam generated in the high-pressure energy storage solution tank (3) and used for heating lithium bromide aqueous solution in the low-pressure energy storage solution tank (4), and the lithium bromide aqueous solution is continuously sprayed on the heat exchanger through a second circulating pump (P2) and a second valve; refrigerant steam enters the water storage tank (5) through a pipeline after releasing heat, refrigerant steam generated after a lithium bromide water solution in the low-pressure energy storage solution tank (4) is heated also enters the water storage tank (5) through an upper pipeline, cooling water circulated from the cooling tower (11) is completely condensed into liquid refrigerant, the cooling tower (11) is connected with a heat exchanger in the water storage tank (5) through a pipeline, and the liquid refrigerant in the water storage tank (5) is sprayed on the internal heat exchanger through a third circulating pump (P3) and a third valve (V3) and is continuously cooled; liquid refrigerant in the water storage tank (5) enters the evaporator (7) through a third circulating pump (P3), a ninth valve (V9) and a fifth valve throttling valve (V5) and is sprayed on the surface of a heat exchanger in the evaporator (7) through a nozzle.
2. The system of claim 1, wherein: the method adopts a lithium bromide aqueous solution as an absorption refrigeration working medium as an energy storage medium, and adopts a daytime mode as follows: an eighth valve (V8) and a tenth valve (V10) on a lithium bromide aqueous solution loop formed by the high-pressure energy storage solution tank (3), the low-pressure energy storage solution tank (4) and the absorber (6) and a ninth valve (V9) between the water storage tank (5) and the evaporator (7) are closed, a first valve (V1) connected with the high-pressure energy storage solution tank (3), a second valve (V2) connected with the low-pressure energy storage solution tank (4), a third valve (V3) connected with the water storage tank (5), a fourth valve (V4) at the outflow end of the lithium bromide aqueous solution of the absorber (6), a fifth valve throttle valve (V5) and a sixth valve (V6) at the inflow end of the lithium bromide aqueous solution of the absorber (6) are opened, and the groove type solar heat collector (1) absorbs solar energy to heat conduction oil; when the heat conducting oil reaches the set temperature of the system, a seventh valve, a three-way valve (V7) is opened to connect the oil storage tank (2) to a branch of a heat exchanger in the high-pressure generator (9) so as to provide heat for the absorption refrigerator, and the refrigerator starts to work and refrigerate; when the temperature in the oil storage tank (2) exceeds 290 ℃, a seventh valve, a three-way valve (V7) flows into the energy storage system end to be opened, redundant heat is conveyed to the double-effect three-phase energy accumulator, the first circulating pump (P1) and the second circulating pump (P2) are opened, and the energy accumulator is opened in an energy storage mode; the lithium bromide water solution in the high-pressure energy storage solution tank (3) is continuously sprayed on a heat exchanger tube bundle of the high-pressure energy storage solution tank through a first circulating pump (P1), the lithium bromide water solution is heated to raise the temperature to generate refrigerant steam, the refrigerant steam is generated along with the continuous circulating heating of the lithium bromide water solution, and the temperature and the concentration of the lithium bromide water solution are gradually raised until the preset concentration is reached; the generated refrigerant steam enters a low-pressure energy storage solution tank (4) to heat the lithium bromide aqueous solution, so that the lithium bromide aqueous solution is concentrated, lithium bromide crystals begin to be separated out after the lithium bromide aqueous solution reaches a crystallization state point, the separated lithium bromide crystals are separated from the lithium bromide aqueous solution after being filtered by a filter screen, and the residual lithium bromide aqueous solution in the high-pressure energy storage solution tank (3) and the low-pressure energy storage solution tank (4) continues to be circularly sprayed, is heated by a heat source, and is separated out until the energy storage is finished; refrigerant steam generated by the high-pressure energy storage solution tank (3) is condensed into liquid refrigerant after heat release, and enters the water storage tank (5) together with the refrigerant steam generated by the low-pressure energy storage solution tank (4), and the refrigerant steam is cooled into liquid refrigerant by cooling water and stored in the water storage tank (5); night mode: opening an eighth valve (V8), a ninth valve (V9) and a tenth valve (V10), closing a first valve (V1), a second valve (V2), a third valve (V3), a fourth valve (V4) and a sixth valve (V6), and stopping the operation of the trough-type solar collector (1); the high-low generator and the condenser (8) of the absorption refrigerator stop running, a first circulating pump (P1), a second circulating pump (P2), a third circulating pump (P3), a fourth circulating pump (P4) and a fifth circulating pump (P5) are started, and the double-effect three-phase energy accumulator is started to release energy; liquid refrigerant in the water storage tank (5) is conveyed to the evaporator (7) by a third circulating pump (P3), and the liquid refrigerant is evaporated in the evaporator (7) to absorb heat and become refrigerant vapor to enter the absorber (6); the concentrated lithium bromide aqueous solution absorbs refrigerant steam from the evaporator (7) to become hot dilute lithium bromide aqueous solution, and the hot dilute lithium bromide aqueous solution is respectively conveyed to the high-pressure energy storage solution tank (3) and the low-pressure energy storage solution tank (4) through a fourth circulating pump (P4) to continuously dissolve lithium bromide crystals, so that the concentration of the lithium bromide aqueous solution is continuously reduced until energy release is finished, and the lithium bromide aqueous solution is recovered to the initial state of the energy storage system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110708614.5A CN113531944B (en) | 2021-06-25 | 2021-06-25 | Double-effect three-phase energy storage and absorption type refrigerating system |
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