CN110173919B - Device for improving performance of gas type ammonia water bromine heat pump based on electrically driven membrane separation technology - Google Patents
Device for improving performance of gas type ammonia water bromine heat pump based on electrically driven membrane separation technology Download PDFInfo
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- CN110173919B CN110173919B CN201910360422.2A CN201910360422A CN110173919B CN 110173919 B CN110173919 B CN 110173919B CN 201910360422 A CN201910360422 A CN 201910360422A CN 110173919 B CN110173919 B CN 110173919B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D3/00—Hot-water central heating systems
- F24D3/18—Hot-water central heating systems using heat pumps
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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
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D2200/00—Heat sources or energy sources
- F24D2200/12—Heat pump
- F24D2200/126—Absorption type heat pumps
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/62—Absorption based systems
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Abstract
The invention discloses a device for improving the performance of a fuel gas type ammonia water bromine heat pump based on an electrically driven membrane separation technology, which comprises a low-pressure stage solution circulating system, a high-pressure stage solution circulating system and a fuel gas system, wherein the low-pressure stage solution circulating system comprises a low-pressure absorber, a first-stage throttling valve, a first-stage electrically driven membrane separator, a first-stage solution heat exchanger, a first-stage solution pump, a low-pressure dephlegmator and a low-pressure generator, the high-pressure stage solution circulating system comprises a high-pressure absorber, a second-stage throttling valve, a second-stage electrically driven membrane separator, a second-stage solution heat exchanger, the primary electrically-driven membrane separator and the secondary electrically-driven membrane separator are electrically-driven membrane separators, and the invention ensures that the generation efficiency of the ternary working medium is improved by utilizing the electrically-driven membrane separation technology, does not influence the absorption capacity, and improves the utilization efficiency of the heat of the fuel gas; and when the outdoor temperature is too low, the heat production capacity is improved by adopting a waste gas heat supplementing mode.
Description
Technical Field
The invention relates to a novel first-class two-stage ammonia water gas absorption heat pump technology utilizing an electrically driven membrane separation device, and belongs to the technical field of heat pumps.
Background
At present, the northern winter heating equipment is mainly a boiler, the heat supply requirement is met by a mode of directly exchanging heat generated by combustion, and the highest utilization efficiency of primary energy can only reach 1 by the existing method for improving the combustion efficiency and the heat exchange efficiency of the boiler under the ideal condition without heat loss. The first kind of ammonia absorption heat pump is driven by high temperature heat energy to raise the heat energy of low temperature heat source to middle temperature and produce great amount of useful heat energy in middle temperature, and this raises the heat energy utilizing efficiency. The first type of ammonia absorption heat pump is realized by a common absorption refrigeration cycle, and the coefficient of performance of the first type of ammonia absorption heat pump is more than 1. The combustion heat of the natural gas can be fully utilized through two-stage circulation, and the performance coefficient of the gas absorption heat pump is further improved.
The ammonia-water absorption heat pump uses ammonia-water as a working medium pair, has the advantages of low price, no damage to natural environment and the like, and is increasingly paid more attention to the modern times that the quality and the precision of industrial production parts are guaranteed. However, the standard boiling point difference between ammonia and water is relatively small (only 133.4 ℃), and the ammonia water solution has large water content when being heated, boiled and separated by a generator, which affects the stability of a heat pump unit, so that the ammonia gas must be purified by a rectifying device, the initial investment of equipment is large, and the energy consumption in the rectifying process is high. The third working medium lithium bromide is added, so that the generation efficiency of ammonia can be effectively improved, the utilization rate of heat is improved, the requirements of the absorption heat pump on the temperature and the heat of a heat source are reduced, and the volume of rectification equipment is reduced. The lithium bromide serving as a third working medium can block the absorption process of ammonia in the absorber, the absorption capacity of the solution in the absorber to the ammonia is reduced, the absorption process is not favorable, the heat production quantity of the high-pressure absorber and the low-pressure absorber is reduced, and the performance coefficient of the gas type two-stage first-class absorption heat pump is reduced. The selective permeability of the membrane in the electrically-driven membrane separation device utilizing the electrodialysis technology to anions and cations can realize the reasonable distribution of lithium bromide in the solution, the lithium bromide can improve the generating capacity of ammonia and simultaneously reduce the inhibition of the absorption performance of the solution to the ammonia, and the performance coefficient of the two-stage first-class ammonia absorption heat pump system is further improved.
The natural gas is used as clean energy and is a heating energy widely popularized and used in China, the gas-type absorption heat pump can improve the utilization rate of heat, and the problems of high-grade energy waste and heat grade matching still exist in the gas-type absorption heat pump. The exhaust temperature of the gas of the generator still has the waste heat of more than 200 ℃ and is directly discharged into the atmosphere, the absorber and the rectifying tower need external cooling, the outdoor temperature is low in northern winter, heat is difficult to extract from the environment, and the temperature difference is larger than the heat supply temperature. The two-stage utilization of heat is realized through designing the exhaust pipeline, the utilization efficiency of gas is improved, and the heating capacity in winter is guaranteed for the evaporimeter concurrent heating. The water supply and return are reasonably arranged, so that the effective utilization of heat in each part is realized, and the heat supply effect is improved.
Disclosure of Invention
The purpose of the invention is as follows: due to the defects of the ammonia absorption heat pump, the invention provides a device for improving the performance of a gas-type ammonia water bromine heat pump based on an electric drive membrane separation technology, the device can realize the distribution of lithium bromide in an absorber and a generator in a high-pressure stage and a low-pressure stage, improve the heat production capacity of the high-pressure absorber, improve the generation efficiency of a two-stage first-class ammonia water absorption heat pump, and increase and ensure the heat supply heat in winter.
The technical scheme is as follows: in order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides a promote device of gas type aqueous ammonia bromine heat pump performance based on electrically driven membrane separation technique, includes low pressure level solution circulation system, high pressure level solution circulation system, gas system, wherein:
the low-pressure stage solution circulating system comprises a low-pressure absorber, a first-stage throttling valve, a first-stage electrically-driven membrane separator, a first-stage solution heat exchanger, a first-stage solution pump, a low-pressure partial condenser and a low-pressure generator, wherein: the high-concentration ammonia low-concentration lithium bromide solution outlet of the low-pressure absorber is connected with the inlet of a primary solution pump, the outlet of the primary solution pump is connected with the low-temperature high-concentration ammonia low-concentration lithium bromide solution inlet of a primary solution heat exchanger, the high-temperature high-concentration ammonia low-concentration lithium bromide solution outlet of the primary solution heat exchanger is connected with the high-concentration ammonia low-concentration lithium bromide solution inlet of a primary electrically-driven membrane separator, the high-concentration ammonia high-concentration lithium bromide solution outlet of the primary electrically-driven membrane separator is connected with the high-concentration ammonia high-concentration lithium bromide solution inlet of the low-pressure generator, and the low-pressure generator is connected with the low-pressure dep; the low-concentration ammonia high-concentration lithium bromide solution outlet of the low-pressure generator is connected with the low-concentration ammonia high-concentration lithium bromide solution inlet of the first-level solution heat exchanger, the low-temperature low-concentration ammonia high-concentration lithium bromide solution outlet of the first-level solution heat exchanger is connected with the low-temperature low-concentration ammonia high-concentration lithium bromide solution inlet of the first-level electrically-driven membrane separator, the low-concentration ammonia low-concentration lithium bromide solution outlet of the first-level electrically-driven membrane separator is connected with the inlet of the first-level throttle valve, and the outlet of the first-level throttle valve is connected with the inlet of the low-concentration.
The high-pressure stage solution circulating system comprises a high-pressure absorber, a second-stage throttle valve, a second-stage electrically-driven membrane separator, a second-stage solution heat exchanger, a second-stage solution pump, a high-pressure generator, a high-pressure partial condenser and a second-stage solution pump, the ammonia outlet of the low-pressure dephlegmator is connected with the ammonia inlet of the high-pressure absorber, the high-concentration ammonia low-concentration lithium bromide solution outlet of the high-pressure absorber is connected with the inlet of the secondary solution pump, the outlet of the secondary solution pump is connected with the low-temperature high-concentration ammonia low-concentration lithium bromide inlet of the secondary solution heat exchanger, the high-temperature high-concentration ammonia low-concentration lithium bromide outlet of the secondary solution heat exchanger is connected with the high-concentration ammonia low-concentration lithium bromide inlet of the secondary electrically-driven membrane separator, the high-concentration ammonia high-concentration lithium bromide solution outlet of the secondary electrically-driven membrane separator is connected with the high-concentration ammonia high-concentration lithium bromide solution inlet of the high-pressure generator, and the high; the dilute ammonia high-concentration lithium bromide solution outlet of the high-pressure generator is connected with the low-concentration ammonia high-concentration lithium bromide solution inlet of the secondary solution heat exchanger, the high-temperature dilute ammonia high-concentration lithium bromide solution outlet of the secondary solution heat exchanger is connected with the high-temperature dilute ammonia high-concentration lithium bromide solution inlet of the secondary electric drive membrane separator, the high-temperature dilute ammonia dilute lithium bromide solution outlet of the secondary electric drive membrane separator is connected with the secondary throttle valve, and the secondary throttle valve is connected with the high-pressure generator.
The primary electrically-driven membrane separator and the secondary electrically-driven membrane separator are both electrically-driven membrane separators, each electrically-driven membrane separator comprises more than one high-concentration ammonia-water-lithium bromide solution chamber, a low-concentration ammonia-water-lithium bromide solution chamber is arranged between every two high-concentration ammonia-water-lithium bromide solution chambers, the low-concentration ammonia-water-lithium bromide solution chambers and the high-concentration ammonia-water-lithium bromide solution chambers are separated through a pair of anion-cation exchange membranes, and the high-concentration ammonia-water-lithium bromide solution chambers at the two ends are respectively provided with a positive electrode and a negative electrode. Each pair of anion-cation exchange membranes comprises a cation exchange membrane and an anion exchange membrane, wherein the anion exchange membrane is arranged on one side of the high-concentration lithium bromide chamber close to the positive electrode, and the cation exchange membrane is arranged on one side of the high-concentration lithium bromide chamber close to the negative electrode.
The gas system comprises an air supply pipeline, a waste gas re-heating pipeline and a heat supplementing pipeline, natural gas enters the high-pressure generator through the air supply pipeline to be combusted to provide heat for the high-pressure generation process, when the ambient temperature is higher than minus 5 ℃, waste gas enters the low-pressure generator through the waste gas re-heating pipeline to provide heat for the first-level generation process, and when the ambient temperature is lower than minus 5 ℃, part of waste gas enters the evaporator through the heat supplementing pipeline to supplement the heat required by the evaporation of refrigerant ammonia.
Further: the high-pressure partial condenser comprises an evaporator, a condenser and a working medium throttle valve, wherein an ammonia gas outlet of the high-pressure partial condenser, the working medium throttle valve, the evaporator and an ammonia gas inlet of the low-pressure absorber are sequentially connected.
Further: the system also comprises a water supply and return system, wherein the water supply and return system is used for sequentially connecting the cooling coil pipes of the low-pressure absorber, the low-pressure dephlegmator and the high-pressure absorber in series through a water return pipeline, the water return pipeline enables a water return belt to enter the low-pressure absorber to absorb process heat, then enters the low-pressure dephlegmator to absorb heat, then enters the cooling coil pipe of the high-pressure absorber to absorb medium-temperature heat, and return water enters the condenser from the cooling coil pipe outlet of the high-pressure absorber to reduce the temperature of.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a device for improving the performance of a gas type ammonia water bromine heat pump based on an electric drive membrane separation technology, wherein a heat pump system is a gas type ammonia-water-lithium bromide two-stage first-class absorption heat pump circulating system. The electrodialysis technology is combined to utilize the promotion of the ternary working medium to the generation process and reduce the inhibition to the absorption process, so that the absorption heat pump has higher performance coefficient.
Drawings
FIG. 1 is a schematic structural diagram of the present invention
Wherein, 1 is an evaporator, 2 is a low-pressure absorber, 3 is a first-stage throttling valve, 4 is a first-stage electrically-driven membrane separator, 5 is a first-stage solution heat exchanger, 6 is a first-stage solution pump, 7 is a low-pressure dephlegmator, 8 is a low-pressure generator, 9 is a high-pressure absorber, 10 is a second-stage throttling valve, 11 is a second-stage electrically-driven membrane separator, 12 is a second-stage solution heat exchanger, 13 is a second-stage solution pump, 14 is a high-pressure generator, 15 is a high-pressure dephlegmator, 16 is a condenser, and 17 is.
Detailed Description
The present invention is further illustrated by the following description in conjunction with the accompanying drawings and the specific embodiments, it is to be understood that these examples are given solely for the purpose of illustration and are not intended as a definition of the limits of the invention, since various equivalent modifications will occur to those skilled in the art upon reading the present invention and fall within the limits of the appended claims.
The utility model provides a device for promote gas type aqueous ammonia bromine heat pump performance based on electric drive membrane separation technique, as shown in figure 1, includes low-pressure level solution circulation system, high-pressure level solution circulation system, gas system, refrigerant system, supplies the return water system, wherein:
the low-pressure stage solution circulating system comprises a low-pressure absorber 2, a first-stage throttling valve 3, a first-stage electrically-driven membrane separator 4, a first-stage solution heat exchanger 5, a first-stage solution pump 6, a low-pressure dephlegmator 7 and a low-pressure generator 8, wherein: the high-concentration ammonia low-concentration lithium bromide solution outlet of the low-pressure absorber 2 is connected with the inlet of a first-stage solution pump 6, the outlet of the first-stage solution pump 6 is connected with the low-temperature high-concentration ammonia low-concentration lithium bromide solution inlet 5a of a first-stage solution heat exchanger 5, the high-temperature high-concentration ammonia low-concentration lithium bromide solution outlet 5b of the first-stage solution heat exchanger 5 is connected with the high-concentration ammonia low-concentration lithium bromide solution inlet 4a of a first-stage electrically-driven membrane separator 4, the high-concentration ammonia high-concentration lithium bromide solution outlet 4b of the first-stage electrically-driven membrane separator 4 is connected with the high-concentration ammonia high-concentration lithium bromide solution inlet of a low-pressure generator 8, and the low-; the low-concentration ammonia high-concentration lithium bromide solution outlet of the low-pressure generator 8 is connected with the high-temperature low-concentration ammonia high-concentration lithium bromide solution inlet 5c of the first-level solution heat exchanger 5, the low-temperature low-concentration ammonia high-concentration lithium bromide solution outlet 5d of the first-level solution heat exchanger 5 is connected with the low-temperature low-concentration ammonia high-concentration lithium bromide solution inlet 4c of the first-level electrically-driven membrane separator 4, the low-concentration ammonia low-concentration lithium bromide solution outlet 4d of the first-level electrically-driven membrane separator 4 is connected with the inlet of the first-level throttling valve 3, and the outlet of the first-level throttling valve 3 is connected with the inlet of the low-.
The high-pressure stage solution circulating system comprises a high-pressure absorber 9, a secondary throttle valve 10, a secondary electrically-driven membrane separator 11, a secondary solution heat exchanger 12, a secondary solution pump 13, a high-pressure generator 14, a high-pressure dephlegmator 15 and a secondary solution pump 13, wherein an ammonia outlet of the low-pressure dephlegmator 7 is connected with an ammonia inlet of the high-pressure absorber 9, a high-concentration ammonia low-concentration lithium bromide solution outlet of the high-pressure absorber 9 is connected with an inlet of the secondary solution pump 13, an outlet of the secondary solution pump 13 is connected with a low-temperature high-concentration ammonia low-concentration lithium bromide inlet 12a of the secondary solution heat exchanger 12, a high-temperature high-concentration ammonia low-concentration lithium bromide outlet 12b of the secondary solution heat exchanger 12 is connected with a high-concentration ammonia low-concentration lithium bromide inlet 11c of the secondary electrically-driven membrane separator 11, a high-concentration ammonia high-concentration lithium bromide solution outlet 11d of the secondary, the high-voltage generator 14 is connected with the high-voltage partial condenser 15; the dilute ammonia high-concentration lithium bromide solution outlet of the high-pressure generator 14 is connected with the high-temperature low-concentration ammonia high-concentration lithium bromide solution inlet 12c of the secondary solution heat exchanger 12, the low-temperature low-concentration ammonia high-concentration lithium bromide solution outlet 12d of the secondary solution heat exchanger 12 is connected with the low-concentration ammonia high-concentration lithium bromide solution inlet 11a of the secondary electrically-driven membrane separator 11, the low-concentration ammonia low-concentration lithium bromide solution outlet 11b of the secondary electrically-driven membrane separator 11 is connected with the secondary throttle valve 10, and the secondary throttle valve 10 is connected with the high-pressure generator 9.
The primary electrically-driven membrane separator 4 and the secondary electrically-driven membrane separator 11 are both electrically-driven membrane separators, and adopt an electrically-driven electrodialysis technology, the electrically-driven membrane separator comprises more than one high-concentration ammonia-water-lithium bromide solution chamber, a low-concentration ammonia-water-lithium bromide solution chamber is arranged between every two high-concentration ammonia-water-lithium bromide solution chambers, the low-concentration ammonia-water-lithium bromide solution chamber and the high-concentration ammonia-water-lithium bromide solution chamber are separated by a pair of anion-cation exchange membranes, and the high-concentration ammonia-water-lithium bromide solution chambers at the two ends are respectively provided with a positive electrode and a negative electrode. Each pair of anion-cation exchange membranes comprises a cation exchange membrane and an anion exchange membrane, wherein the anion exchange membrane is arranged on one side of the high-concentration lithium bromide chamber close to the positive electrode, and the cation exchange membrane is arranged on one side of the high-concentration lithium bromide chamber close to the negative electrode.
The gas system comprises an air supply pipeline, a waste gas re-heating pipeline and a heat supplementing pipeline, natural gas enters the high-pressure generator 14 through the air supply pipeline to be combusted to provide heat for a high-pressure generation process, when the ambient temperature is higher than minus 5 ℃, waste gas enters the low-pressure generator 8 through the waste gas re-heating pipeline to provide heat for a first-stage generation process, and when the ambient temperature is lower than minus 5 ℃, part of waste gas enters the evaporator 1 through the heat supplementing pipeline to supplement the heat required by the evaporation of refrigerant ammonia.
The refrigerant system comprises an evaporator 1, a condenser 16 and a working medium throttle valve 17, wherein an ammonia gas outlet of the high-pressure dephlegmator 15, the condenser 16, the working medium throttle valve 17, the evaporator 1 and an ammonia gas inlet of the low-pressure absorber 2 are sequentially connected.
The water supply and return system is connected with the cooling coil of the low-pressure absorber 2, the low-pressure dephlegmator 7 and the high-pressure absorber 9 and the condenser 16 in series in sequence through a water return pipeline, the water return pipeline brings the return water into the low-pressure absorber 2 to absorb process heat, then enters the low-pressure dephlegmator 7 to absorb heat, then enters the cooling coil of the high-pressure absorber 9 to absorb medium-temperature heat, and the return water enters the condenser 16 from the cooling coil outlet of the high-pressure absorber 9 to reduce the ammonia temperature and generate medium-temperature hot water.
The heat pump cycle working process of the embodiment:
ammonia-water-lithium bromide ternary working medium of low-concentration ammonia low-concentration lithium bromide in a low-pressure absorber 2 absorbs ammonia gas from an evaporator 1 to generate a large amount of heat, and the heat is cooled by backwater to obtain a low-pressure high-temperature high-concentration ammonia low-concentration lithium bromide solution, the low-pressure high-temperature high-concentration ammonia low-concentration lithium bromide solution is pressurized by a primary solution pump 6 to obtain a high-pressure high-temperature high-concentration ammonia low-concentration lithium bromide solution, the high-pressure high-temperature high-concentration ammonia low-concentration lithium bromide solution enters a primary solution heat exchanger 5 to perform solution heat exchange to obtain a high-pressure low-temperature high-concentration ammonia low-concentration lithium bromide solution, the high-pressure low-temperature high-concentration ammonia low-concentration lithium bromide solution enters a primary electrically driven membrane separator 4 to receive lithium bromide ions screened by a cation-anion exchange membrane from the other side to generate a high-pressure low-temperature; heating the high-pressure low-temperature high-concentration ammonia high-concentration lithium bromide solution in a low-pressure generator 8 by natural gas combustion waste heat to obtain steam, rectifying the steam and passing through a low-pressure dephlegmator 7 to generate high-purity ammonia steam, sending the high-purity ammonia steam into a high-pressure absorber 9, and sending the generated low-pressure high-temperature high-concentration ammonia lithium bromide solution into a low-pressure generator 8; the low-pressure low-temperature low-concentration ammonia high-concentration lithium bromide solution obtained after the low-pressure generator 8 finishes generating is subjected to heat exchange through the primary solution heat exchanger 5 to obtain the low-pressure high-temperature low-concentration ammonia high-concentration lithium bromide solution, the low-pressure high-temperature low-concentration ammonia high-concentration lithium bromide solution enters the primary electrically driven membrane separator 4, under the driving of electric field force and the ion selective permeability characteristic of an ion exchange membrane, lithium bromide ions in the solution are screened to the other side of the ion exchange membrane to generate the low-pressure high-temperature low-concentration ammonia low-concentration lithium bromide solution, and the low-pressure high-temperature low-concentration ammonia low-concentration lithium bromide solution is throttled and depressurized through the primary throttle valve 3 and then.
The high-pressure absorber 9 absorbs the high-purity ammonia gas from the low-pressure generator 8 to generate heat which is absorbed by backwater to generate a low-pressure low-temperature high-concentration ammonia low-concentration lithium bromide solution, the low-pressure low-temperature high-concentration ammonia low-concentration lithium bromide solution is boosted by a secondary solution pump 13 to obtain a high-pressure low-temperature high-concentration ammonia low-concentration lithium bromide solution, the high-pressure low-temperature high-concentration ammonia low-concentration lithium bromide solution is sent to a secondary solution heat exchanger 12 to absorb heat in the secondary solution heat exchanger 12 to obtain a high-pressure high-temperature high-concentration ammonia low-concentration lithium bromide solution, the high-pressure high-temperature high-concentration ammonia low-concentration lithium bromide solution is sent to a secondary electrically driven membrane separator 11, the solution receives lithium bromide ions screened by a cation exchange membrane from the other side to generate a high-pressure high-temperature high-concentration ammonia, the solution is heated again by intermediate temperature heat sources such as waste heat and waste heat in a high pressure generator 14 to generate steam, and the steam is rectified and subjected to a high pressure dephlegmator 15 to generate high purity ammonia steam to enter a condenser 16; the remaining high-pressure high-temperature high-concentration and low-concentration ammonia high-concentration lithium bromide solution enters a secondary solution heat exchanger 12 to obtain a high-pressure low-temperature low-concentration ammonia high-concentration lithium bromide solution, the high-pressure low-temperature low-concentration ammonia high-concentration lithium bromide solution enters a secondary electrically driven membrane separator 11, under the driving of electric field force and the ion selective permeability characteristic of an ion exchange membrane, lithium bromide ions in the solution are screened to the other side of the ion exchange membrane to generate a high-pressure low-temperature low-concentration ammonia low-concentration lithium bromide solution, the high-pressure low-temperature low-concentration ammonia low-concentration lithium bromide solution is throttled and reduced in pressure by a secondary throttle valve 10 to obtain a low-pressure low-temperature low-concentration ammonia low-concentration lithium bromide solution, the low-pressure low-temperature low-concentration ammonia low-concentration lithium bromide solution enters a high-pressure absorber 9, high-.
The return water is subjected to heat exchange through the low-pressure absorber 2, the low-pressure partial condenser 7 and the high-pressure absorber 9 to gradually increase the water temperature, and finally a large amount of high-temperature ammonia gas is cooled in the condenser 16 to realize ammonia condensation and generate a large amount of medium-temperature hot water.
The device of the invention utilizes the electrically driven membrane separation technology to ensure that the ternary working medium improves the generation efficiency without influencing the absorption capacity, and improves the utilization efficiency of the heat of the fuel gas; and when the outdoor temperature is too low, the heat production capacity is improved by adopting a waste gas heat supplementing mode.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (3)
1. The utility model provides a promote device of gas type aqueous ammonia bromine heat pump performance based on electrically driven membrane separation technique which characterized in that: including low pressure level solution circulation system, high pressure level solution circulation system, gas system, wherein:
the low-pressure-stage solution circulating system comprises a low-pressure absorber (2), a first-stage throttling valve (3), a first-stage electrically-driven membrane separator (4), a first-stage solution heat exchanger (5), a first-stage solution pump (6), a low-pressure dephlegmator (7) and a low-pressure generator (8), wherein: the outlet of the high-concentration ammonia low-concentration lithium bromide solution of the low-pressure absorber (2) is connected with the inlet of a first-stage solution pump (6), the outlet of the first-stage solution pump (6) is connected with the low-temperature high-concentration ammonia low-concentration lithium bromide solution inlet (5 a) of a first-stage solution heat exchanger (5), the outlet of the high-temperature high-concentration ammonia low-concentration lithium bromide solution of the first-stage solution heat exchanger (5) is connected with the high-concentration ammonia low-concentration lithium bromide solution inlet (4 a) of a first-stage electrically driven membrane separator (4), the high-concentration ammonia high-concentration lithium bromide solution outlet (4 b) of the first-stage electrically driven membrane separator (4) is connected with the high-concentration ammonia high-concentration lithium bromide solution inlet of a low-pressure generator (8), and the low-pressure generator (8) is connected with a low-; a low-concentration ammonia high-concentration lithium bromide solution outlet of the low-pressure generator (8) is connected with a high-temperature low-concentration ammonia high-concentration lithium bromide solution inlet (5 c) of the primary solution heat exchanger (5), a low-temperature low-concentration ammonia high-concentration lithium bromide solution outlet (5 d) of the primary solution heat exchanger (5) is connected with a low-concentration ammonia high-concentration lithium bromide solution inlet (4 c) of the primary electrically-driven membrane separator (4), a low-concentration ammonia low-concentration lithium bromide solution outlet (4 d) of the primary electrically-driven membrane separator (4) is connected with an inlet of the primary throttle valve (3), and an outlet of the primary throttle valve (3) is connected with a low-concentration ammonia low-concentration lithium bromide solution inlet of the low-pressure absorber (2);
the high-pressure stage solution circulating system comprises a high-pressure absorber (9), a secondary throttle valve (10), a secondary electrically-driven membrane separator (11), a secondary solution heat exchanger (12), a secondary solution pump (13), a high-pressure generator (14) and a high-pressure dephlegmator (15), wherein an ammonia outlet of the low-pressure dephlegmator (7) is connected with an ammonia inlet of the high-pressure absorber (9), a high-concentration ammonia low-concentration lithium bromide solution outlet of the high-pressure absorber (9) is connected with an inlet of the secondary solution pump (13), an outlet of the secondary solution pump (13) is connected with a low-temperature high-concentration ammonia low-concentration lithium bromide inlet (12 a) of the secondary solution heat exchanger (12), a high-temperature high-concentration ammonia low-concentration lithium bromide outlet (12 b) of the secondary solution heat exchanger (12) is connected with a high-concentration ammonia low-concentration lithium bromide inlet (11 c, a high-concentration ammonia high-concentration lithium bromide solution outlet (11 d) of the secondary electrically driven membrane separator (11) is connected with a high-concentration ammonia high-concentration lithium bromide solution inlet of a high-pressure generator (14), and the high-pressure generator (14) is connected with a high-pressure dephlegmator (15); a low-concentration ammonia high-concentration lithium bromide solution outlet of the high-pressure generator (14) is connected with a high-temperature low-concentration ammonia high-concentration lithium bromide solution inlet (12 c) of the secondary solution heat exchanger (12), a low-temperature low-concentration ammonia high-concentration lithium bromide solution outlet (12 d) of the secondary solution heat exchanger (12) is connected with a low-concentration ammonia high-concentration lithium bromide solution inlet (11 a) of the secondary electrically-driven membrane separator (11), a low-concentration ammonia low-concentration lithium bromide solution outlet (11 b) of the secondary electrically-driven membrane separator (11) is connected with the secondary throttle valve (10), and the secondary throttle valve (10) is connected with the high-pressure absorber (9);
the primary electrically-driven membrane separator (4) and the secondary electrically-driven membrane separator (11) are both electrically-driven membrane separators, each electrically-driven membrane separator comprises more than one high-concentration ammonia-water-lithium bromide solution chamber, a low-concentration ammonia-water-lithium bromide solution chamber is arranged between every two high-concentration ammonia-water-lithium bromide solution chambers, the low-concentration ammonia-water-lithium bromide solution chambers and the high-concentration ammonia-water-lithium bromide solution chambers are separated by a pair of anion and cation exchange membranes, and the high-concentration ammonia-water-lithium bromide solution chambers at the two ends are respectively provided with a positive electrode and a negative electrode; each pair of anion-cation exchange membranes comprises a cation exchange membrane and an anion exchange membrane, wherein the anion exchange membrane is arranged on one side of the high-concentration lithium bromide chamber close to the positive electrode, and the cation exchange membrane is arranged on one side of the high-concentration lithium bromide chamber close to the negative electrode;
the gas system comprises an air supply pipeline, a waste gas re-heating pipeline and a heat supplementing pipeline, natural gas enters a high-pressure generator (14) through the air supply pipeline to be combusted to provide heat for a high-pressure generation process, when the ambient temperature is higher than minus 5 ℃, waste gas enters a low-pressure generator (8) through the waste gas re-heating pipeline to provide heat for a first-stage generation process, and when the ambient temperature is lower than minus 5 ℃, part of waste gas enters an evaporator (1) through the heat supplementing pipeline to supplement the heat required by the evaporation of refrigerant ammonia.
2. The device for improving the performance of the gas-fired ammonia-water bromine heat pump based on the electrically-driven membrane separation technology according to claim 1 is characterized in that: the device also comprises a refrigerant system, wherein the refrigerant system comprises an evaporator (1), a condenser (16) and a working medium throttle valve (17), and an ammonia gas outlet of the high-pressure dephlegmator (15), the condenser (16), the working medium throttle valve (17), the evaporator (1) and an ammonia gas inlet of the low-pressure absorber (2) are sequentially connected.
3. The device for improving the performance of the gas-fired ammonia-water bromine heat pump based on the electrically-driven membrane separation technology according to claim 2 is characterized in that: the ammonia gas heat recovery system is characterized by further comprising a water supply and return system, wherein the water supply and return system is used for sequentially connecting a cooling coil of the low-pressure absorber (2), the low-pressure dephlegmator (7) and a cooling coil of the high-pressure absorber (9) in series through a water return pipeline, the water return pipeline brings return water into the low-pressure absorber (2) to absorb process heat, then enters the absorption heat of the low-pressure dephlegmator (7), then enters the cooling coil of the high-pressure absorber (9) to absorb medium-temperature heat, and return water enters the condenser (16) from the outlet of the cooling coil of the high-pressure absorber (9).
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