CN111023623B - Low-temperature heat source absorption heat pump circulating system - Google Patents
Low-temperature heat source absorption heat pump circulating system Download PDFInfo
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- CN111023623B CN111023623B CN201911235899.4A CN201911235899A CN111023623B CN 111023623 B CN111023623 B CN 111023623B CN 201911235899 A CN201911235899 A CN 201911235899A CN 111023623 B CN111023623 B CN 111023623B
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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
- F25B30/00—Heat pumps
- F25B30/04—Heat pumps of the sorption type
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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
- F24D3/02—Hot-water central heating systems with forced circulation, e.g. by pumps
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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
- 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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- 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
A low-temperature heat source absorption heat pump circulating system comprises a water-containing low-temperature heat source, a low-pressure evaporator (E1) and a low-pressure absorber (A1), wherein the generated refrigerant steam enters the low-pressure absorber (A1) to be absorbed, one part of solution at the outlet of the low-pressure absorber (A1) enters a high-pressure evaporator (E2), the other part of solution passes through the low-pressure generator (G1) and the high-pressure generator (G2) in sequence to be concentrated and then enters the high-pressure absorber (A2) to absorb the refrigerant steam, and then the refrigerant steam is mixed with the low-temperature solution at the outlet of the high-pressure evaporator (E2) and returns to the low-pressure absorber (A1); refrigerant steam generated by the high-pressure generator (G2) is used as a heat source of the low-pressure generator (G1) to be condensed into refrigerant water, the refrigerant water and the refrigerant steam generated by the low-pressure generator (G1) enter the condenser (C), the condensed refrigerant water enters the high-pressure evaporator (E2) to be evaporated, and redundant refrigerant water is discharged. The system is driven by a high-quality heat source, extracts heat energy from a low-temperature heat source, and greatly improves the energy utilization efficiency.
Description
Technical Field
The invention relates to the technical field of absorption heat pumps, in particular to a low-temperature heat source absorption heat pump circulating system.
Background
With the rapid development of social economy, environmental problems caused by energy shortage and primary energy consumption are becoming more serious. Under the large background of advocating energy conservation and emission reduction, people are more urgent to research energy-saving technology and apply energy-saving equipment. In the energy consumption structure of China, the winter building heating energy consumption in northern areas occupies a considerable share, and most of the existing heating modes have the problems of low energy utilization efficiency, serious pollution emission and the like.
The absorption heat pump is a device which is driven by high-temperature heat energy to realize the transmission of the heat of a low-temperature heat source to a medium-temperature heat source, and is an effective device for recycling low-grade heat energy and supplying heat.
According to the circulation form of the working medium, the absorption heat pump is divided into two types: the first kind of absorption heat pump is also called heat-increasing heat pump, and uses a small amount of high-temperature heat source (such as steam, high-temperature hot water, gas or liquid fuel combustion heat, etc.) as driving heat source to produce a large amount of middle-temperature useful heat energy, i.e. it uses high-temperature heat energy to drive and raise the heat energy of low-temperature heat source to middle temperature, so that it can raise the utilization efficiency of heat energy. The second kind of absorption heat pump is also called as temperature raising heat pump, which utilizes a large amount of middle temperature heat source to generate a small amount of high temperature useful heat energy, namely, the middle and low temperature heat energy is utilized to drive, the heat energy which is less than the middle temperature heat source but higher than the middle temperature heat source is prepared by the heat potential difference of the large amount of middle temperature heat source and the low temperature heat source, and part of the middle and low heat energy is transferred to a higher temperature level, thereby improving the utilization grade of the heat source.
The two types of heat pumps have different application purposes and different working modes, but work between three heat sources, and the temperature change of the three heat sources can directly influence the heat pump cycle.
According to the difference of circulating working media, the absorption heat pump in practical application at present mainly comprises a lithium bromide absorption heat pump taking lithium bromide and water as a working medium pair and an ammonia water absorption heat pump taking ammonia and water as a working medium pair. The absorption heat pump using lithium bromide and water as a working medium pair is mature in technology and is most commonly applied, but because the absorption heat pump uses a lithium bromide aqueous solution as an absorbent and water as a refrigerant, the current technology cannot take heat from a low-temperature heat source below 0 ℃ due to the limitation of the freezing point of water. The absorption heat pump taking ammonia and water as a working medium pair takes an ammonia water solution as an absorbent and ammonia as a refrigerant, can take heat from a low-temperature heat source below 0 ℃, but needs rectification due to small boiling point difference of the ammonia and the water, so that the equipment has a complex structure, high cost and low efficiency; and because the ammonia is toxic, flammable, high-pressure and the like, the use safety of the equipment is seriously influenced, so the ammonia absorption heat pump is applied in a small scale only in some very special industrial occasions.
At present, the first type of lithium bromide absorption heat pump is widely applied in the field of industrial waste heat recovery. The purpose of recovering industrial waste heat is achieved, a part of high-temperature driving heat sources are utilized, the grade of low-temperature waste heat is improved to available heat energy for utilization, for example, the low-temperature waste heat utilization device is used for heating in winter, and the effects of energy conservation and emission reduction are very obvious.
However, the quantity of the industrial waste heat is limited, and industrial enterprises are mostly far away from urban centers, and the waste heat generating place and the heat using place are often difficult to unify and far away, so that the waste heat is difficult to effectively convey. Endless low-temperature heat energy exists in the environment (rivers, lakes, seas, air, urban sewage and the like), and if local materials can be used, the heat energy can be extracted from the environment around a thermal field, so that the use flexibility of the heat energy is undoubtedly improved greatly. However, these ambient heat energies are near 0 ℃ or even below 0 ℃ in the winter, and as previously mentioned, conventional lithium bromide absorption heat pumps are not able to extract heat from these ambient heat sources.
Therefore, it is a significant research topic to improve the first type of lithium bromide absorption heat pump to extract heat energy from these low-temperature environment heat sources.
Disclosure of Invention
Objects of the invention
The invention aims to provide a low-temperature heat source absorption heat pump circulating system.
(II) technical scheme
In order to solve the above problems, according to an aspect of the present invention, there is provided a low temperature heat source absorption heat pump cycle system including: the system comprises a low-pressure generator, a high-pressure generator, a condenser, a low-pressure evaporator, a high-pressure evaporator, a low-pressure absorber and a high-pressure absorber; the high-temperature heat source heats the concentrated solution in the high-pressure generator to generate refrigerant steam, and a refrigerant steam outlet of the high-pressure generator is communicated with a refrigerant steam inlet of the low-pressure generator through a first refrigerant steam pipeline to convey the refrigerant steam to the low-pressure generator; a refrigerant steam outlet of the low-pressure generator is communicated with the condenser through a second refrigerant steam pipeline, and a refrigerant water outlet of the low-pressure generator is communicated with the condenser through a refrigerant pipeline; a refrigerant outlet of the condenser is communicated with a refrigerant water inlet of the high-pressure evaporator through a first refrigerant water pipeline; a refrigerant steam outlet of the high-pressure evaporator is communicated with a refrigerant steam inlet of the high-pressure absorber through a third refrigerant steam pipeline, a part of refrigerant water in the high-pressure evaporator enters the high-pressure absorber through the third refrigerant steam pipeline after being evaporated, and the other part of refrigerant water is discharged through a second refrigerant water pipeline communicated with the high-pressure evaporator; the low-temperature heat source enters the low-pressure evaporator to be evaporated to form refrigerant steam, and a refrigerant steam outlet of the low-pressure evaporator is communicated with the low-pressure absorber through a fourth refrigerant steam pipeline to convey the refrigerant steam to the low-pressure absorber; a dilute solution outlet of the low-pressure absorber is communicated with a dilute solution pipeline, the dilute solution pipeline is divided into two paths, one path of dilute solution pipeline is communicated with a dilute solution inlet of the low-pressure generator, and the other path of dilute solution pipeline is communicated with a heat source inlet of the high-pressure evaporator; the solution outlet of the low-pressure generator is communicated with the solution inlet of the high-pressure generator through a solution pipeline, the solution outlet of the high-pressure generator is communicated with the solution inlet of the high-pressure absorber through a solution pipeline, and the solution outlet of the high-pressure absorber is communicated with the solution inlet of the low-pressure absorber; or the solution outlet of the high-pressure absorber is firstly converged with the solution at the heat source outlet of the high-pressure evaporator and then communicated with the solution inlet of the low-pressure absorber through a solution pipeline.
Further, the method also comprises the following steps: a low temperature solution heat exchanger, a medium temperature solution heat exchanger, a high temperature solution heat exchanger; a solution outlet of the high-pressure absorber is communicated with a hot fluid side inlet of the low-temperature solution heat exchanger through a solution pipeline, and a hot fluid side outlet of the low-temperature solution heat exchanger is communicated with the solution pipeline; one path of dilute solution pipeline of the solution outlet of the low-pressure absorber is communicated with a cold fluid side inlet of the low-temperature solution heat exchanger, a cold fluid side outlet of the low-temperature solution heat exchanger is communicated with a cold fluid side inlet of the medium-temperature solution heat exchanger, and a cold fluid side outlet of the medium-temperature solution heat exchanger is communicated with a solution inlet of the low-pressure generator; the solution outlet of the low-pressure generator is communicated with the cold fluid side inlet of the high-temperature solution heat exchanger, and the cold fluid side outlet of the high-temperature solution heat exchanger is communicated with the solution inlet of the high-pressure generator; the solution outlet of the high-pressure generator is communicated with the hot fluid side inlet of the high-temperature solution heat exchanger, the hot fluid side outlet of the high-temperature solution heat exchanger is communicated with the hot fluid side inlet of the medium-temperature solution heat exchanger, and the hot fluid side outlet of the medium-temperature solution heat exchanger is communicated with the solution inlet of the high-pressure absorber.
Further, the method also comprises the following steps: an air heat collector; the solution outlet of the low-pressure evaporator is communicated with the heat taking side inlet of the air heat collector through a pipeline of a first low-temperature heat source, and the solution flowing out of the low-pressure evaporator absorbs heat in the air heat collector and is heated up to enter the low-pressure evaporator through the pipeline of the low-temperature heat source as the low-temperature heat source.
The further air heat collector is a dividing wall type heat exchanger or a direct contact type heat exchanger; when the air heat collector is a dividing wall type heat exchanger, the second refrigerant water pipeline is communicated with the low-temperature heat source pipeline or the pipeline of the first low-temperature heat source, and the other part of refrigerant water of the high-pressure evaporator is conveyed into the low-pressure evaporator and mixed with the low-temperature heat source after absorbing heat and raising temperature.
Further, the method also comprises the following steps: a second low temperature heat source; the heat transfer tube bundle of the high-pressure evaporator is divided into a first heat transfer tube bundle and a second heat transfer tube bundle, and the first heat transfer tube bundle is circularly communicated with the low-pressure absorber; the second heat transfer tube bundle is in circulating communication with a second low temperature heat source.
Further, the method also comprises the following steps: the high-temperature flue gas heat exchanger, the low-temperature flue gas heat exchanger and the flue gas pipeline; the flue gas outlet of the high-pressure generator is communicated with the flue gas inlet of the high-temperature flue gas heat exchanger through a flue gas pipeline, the flue gas outlet of the high-temperature flue gas heat exchanger is communicated with the flue gas inlet of the low-temperature flue gas heat exchanger, and the flue gas outlet of the low-temperature flue gas heat exchanger is communicated with the external environment; a water side inlet of the high-temperature flue gas heat exchanger is communicated with a water side outlet of the condenser, and a water side outlet of the high-temperature flue gas heat exchanger is communicated with a heat user; the low-temperature flue gas heat exchanger is used as a second low-temperature heat source and is circularly communicated with the second heat transfer tube bundle.
Further, the high-pressure generator is a direct-combustion type generator.
Further, the device also comprises a first valve, a second valve and a third valve; a second valve is arranged between the solution outlet of the high-pressure absorber and the hot-side inlet of the low-temperature solution heat exchanger, and a first valve is also arranged between the solution outlet of the high-pressure absorber and the cold-side inlet of the medium-temperature solution heat exchanger; and a third valve is arranged between the cold side outlet of the low-temperature solution heat exchanger and the cold side inlet of the medium-temperature solution heat exchanger.
Furthermore, the device also comprises a fourth valve, a fifth valve, a sixth valve and a seventh valve; the high-pressure evaporator internally comprises a heat transfer tube bundle which is circularly communicated with the low-pressure absorber and is also circularly communicated with a second low-temperature heat source; a fourth valve is arranged between the heat source outlet of the heat transfer tube bundle and the solution inlet of the low-pressure absorber, and a fifth valve is arranged between the solution outlet of the low-pressure absorber and the heat source inlet of the heat transfer tube bundle; a seventh valve is arranged between the heat source outlet of the heat transfer tube bundle and the second low-temperature heat source, and a sixth valve is arranged between the heat source inlet of the heat transfer tube bundle and the second low-temperature heat source.
Furthermore, the low-pressure evaporator and the low-pressure absorber are arranged in the same cylinder body so as to reduce the flow resistance of the refrigerant steam in the fourth refrigerant steam pipeline; the high-pressure evaporator and the high-pressure absorber are arranged in the same cylinder body so as to reduce the flow resistance of refrigerant steam in the third refrigerant steam pipeline; the low pressure generator and the condenser are arranged in the same cylinder to reduce the flow resistance of the refrigerant steam in the refrigerant pipeline.
(III) advantageous effects
The technical scheme of the invention has the following beneficial technical effects:
the heat energy (sensible heat and/or latent heat of solidification) is extracted from a low-temperature heat source with very low temperature (which can be lower than 0 ℃) by utilizing high-quality heat source driving; the useful heat energy of the middle temperature is generated, thereby greatly improving the utilization efficiency of the heat energy.
Drawings
Fig. 1 is a schematic view of a low-temperature heat source absorption heat pump circulation system according to an embodiment of the present invention;
fig. 2 is a schematic view of a low-temperature heat source absorption heat pump circulation system according to a second embodiment of the present invention;
fig. 3 is a schematic view of a low-temperature heat source absorption heat pump circulation system according to a third embodiment of the present invention;
fig. 4 is a schematic view of a low-temperature heat source absorption heat pump circulation system according to the fourth embodiment of the present invention;
fig. 5 is a schematic view of a low-temperature heat source absorption heat pump circulation system according to a fifth embodiment of the present invention;
fig. 6 is a schematic view of a low-temperature heat source absorption heat pump circulation system according to a sixth embodiment of the present invention;
fig. 7 is a schematic view of a low-temperature heat source absorption heat pump circulation system according to a seventh embodiment of the present invention.
Reference numerals:
a1: a low pressure absorber; a2: a high pressure absorber; c: a condenser; e1: a low pressure evaporator; e2: a high pressure evaporator; g1: a low voltage generator; g2: a high voltage generator;
h1: a low temperature solution heat exchanger; h2: a medium temperature solution heat exchanger; h3 high-temperature solution heat exchanger;
P1-P4: a solution pump; p5: a refrigerant pump; P6-P7: a low temperature heat source circulating pump;
AE: an air heat collector; GEH: a high temperature flue gas heat exchanger; GEL: a low temperature flue gas heat exchanger;
VA: a first valve; VB: a second valve; VC: a third valve; VE: a fourth valve; VF: a fifth valve; VG: a sixth valve; VH: a seventh valve; VD: an eighth valve;
1: a first solution conduit; 2: a second solution conduit; 3: a third solution conduit; 4: a fourth solution conduit; 5: a first refrigerant vapor conduit; 6: a refrigerant conduit; 7: a first refrigerant water pipe; 8: a second refrigerant water pipe; 9: a second refrigerant vapor conduit; 10: a third refrigerant water pipe; 11: a third refrigerant vapor conduit; 12: a first low temperature heat source; 13: a flue gas duct; 14: a hot water pipe; 15: a solution conduit; 16-a low temperature heat source pipeline; 17: a second low temperature heat source.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The present invention will be described in detail below with reference to the accompanying drawings and examples.
The first embodiment is as follows:
fig. 1 is a schematic view of a low-temperature heat source absorption heat pump circulation system according to an embodiment of the present invention.
Referring to fig. 1, in an embodiment of the present invention, a low-temperature heat source absorption heat pump circulation system includes: the system comprises a low-pressure generator G1, a high-pressure generator G2, a condenser C, a low-pressure absorber A1, a high-pressure absorber A2, a low-pressure evaporator E1, a high-pressure evaporator E2, a low-temperature solution heat exchanger H1, a medium-temperature solution heat exchanger H2, a high-temperature solution heat exchanger H3, solution pumps P1-P4, a refrigerant pump P5 and a plurality of connecting pipelines. The components and the pipelines jointly form a solution loop, a refrigerant loop, a driving heat source loop, a hot water loop and a low-temperature heat source loop.
Specifically, the solution circuit is composed of a low-pressure absorber a1, a high-pressure absorber a2, a low-temperature solution heat exchanger H1, a medium-temperature solution heat exchanger H2, a high-temperature solution heat exchanger H3, a low-pressure generator G1, a high-pressure generator G2, a low-pressure evaporator E1, and solution pumps P1 to P4.
The refrigerant circuit is composed of a condenser C, a high-pressure evaporator E2, and a refrigerant pump P5.
The driving heat source circuit is constituted by the high pressure generator G2 and an external boiler, a fuel combustion device, and the like.
The hot water circuit is composed of the high pressure absorber a2, the condenser C, and an external hot water circulation pump, a heat consumer, and the like.
The low-temperature heat source circuit is composed of the low-pressure evaporator E1 and external heat extraction equipment, piping, and the like.
The working principle of the low-temperature heat source absorption heat pump circulating system is as follows:
the low temperature heat source is liquid water or aqueous solution from the outside environment, which enters the low pressure evaporator E1 to absorb heat and evaporate, wherein a part of the liquid water evaporates into refrigerant vapor, and flows into the low pressure absorber a1 through the third refrigerant vapor pipe 11, completing the refrigerant circuit. Meanwhile, the liquid water absorbs heat from the other part of the residual liquid in the evaporation process to cool or solidify the liquid, and the cooled liquid or liquid-solid mixture flows out of the low-pressure evaporator E1 through a pipeline to complete a low-temperature heat source loop.
The low-pressure absorber A1 is circularly communicated with the high-pressure evaporator E2 through a pipeline, after the solution flowing into the low-pressure absorber A1 in the high-pressure evaporator E2 absorbs the refrigerant vapor in the low-pressure absorber A1, the concentration is reduced, the temperature is increased, the heated solution flows out from the first solution pipeline 1 and is divided into two paths, wherein one path is sent into the high-pressure evaporator E2 again through a dilute solution pipeline 1-2 by a solution pump P4 to form a circulation loop. The other path is pressurized by a solution pump P1 through a dilute solution pipeline 1-1 and flows through a low-temperature solution heat exchanger H1.
The high-temperature driving heat source 18 enters the high-pressure generator G2 to release heat and reduce temperature, and is a driving heat source loop. Meanwhile, refrigerant steam is generated and flows out through a refrigerant pipeline 6 to enter a low-pressure generator G1, the refrigerant steam exchanges heat with the solution flowing in from a medium-temperature solution heat exchanger H2, and the solution is concentrated to generate the refrigerant steam while being condensed into refrigerant water; wherein the refrigerant water flows into the condenser C through the first refrigerant water pipeline 7, the generated refrigerant steam also flows into the condenser C through the first refrigerant steam pipeline 5, and the refrigerant water is cooled and condensed into the refrigerant water again in the condenser C and then enters the high-pressure evaporator E2 through the second refrigerant water pipeline 8 to exchange heat with the solution in the high-pressure evaporator E2.
A part of the refrigerant water entering the high-pressure evaporator E2 is discharged directly from one port of the third refrigerant water pipe 10 after heat exchange, or is boosted by the refrigerant pump P5 through the other port of the third refrigerant water pipe 10 and then is conveyed to the high-pressure evaporator E2, and is simultaneously sprayed on the tube bundle of the high-pressure evaporator E2, exchanges heat with the solution in the tube bundle and then is evaporated into refrigerant steam, and the refrigerant steam is conveyed to the high-pressure absorber a2 through the second refrigerant steam pipe 9. Meanwhile, the solution in the tube bundle of the high-pressure evaporator E2 after heat exchange enters the low-pressure absorber A1 again through a pipeline for next circulation.
The other path of solution flowing out of the low-pressure absorber A1 is boosted through a dilute solution pipeline 1-1 by a solution pump P1, flows through a low-temperature solution heat exchanger H1 and is heated by the intermediate solution flowing through a fourth solution pipeline 4 from the high-pressure absorber A2; then flows through the medium temperature solution heat exchanger H2, is heated again by the concentrated solution from the third solution pipeline 3 of the high temperature solution heat exchanger H3, finally enters the low pressure generator G1, exchanges heat with the refrigerant steam in the refrigerant pipeline 6, and generates the refrigerant steam while concentrating into the intermediate solution. Wherein the intermediate solution flows out through the second solution conduit 2 and the refrigerant vapor flows into the condenser C through the first refrigerant vapor conduit 5. And the refrigerant steam in the refrigerant pipeline 6 is cooled and condensed into refrigerant water and then flows out through the first refrigerant water pipeline 7.
The intermediate solution flowing out of the second solution pipe 2 of the low pressure generator G1 is pressurized by the solution pump P3, flows through the high temperature solution heat exchanger H3, is heated by the concentrated solution from the third solution pipe 3 of the high pressure generator G2, finally enters the high pressure generator G2 and is heated again by the driving heat source 18, and is finally concentrated into the concentrated solution, and simultaneously, refrigerant steam is generated. The concentrated solution flows out again through the third solution pipeline 3 and enters the high-temperature solution heat exchanger H3, and the refrigerant steam flows out through the refrigerant pipeline 6 and enters the low-pressure generator G1, and the circulation is carried out.
The concentrated solution flowing out of the high-pressure generator G2 passes through the high-temperature solution heat exchanger H3 under the action of pressure difference and potential difference, releases heat and cools to the intermediate solution 2 in the second solution pipeline 2 from the low-pressure generator G1, releases heat and cools to the solution in the dilute solution pipeline 1-1 from the low-temperature solution heat exchanger H1 through the intermediate-temperature solution heat exchanger H2, finally enters the high-pressure absorber A2, absorbs the refrigerant steam from the second refrigerant steam pipeline 9 of the high-pressure evaporator E2, and flows out through the fourth solution pipeline 4 after being diluted into the intermediate solution; and simultaneously exchanges heat with the water in the hot water pipeline 14 to heat the water.
The intermediate solution flowing out through the fourth solution pipeline 4 is subjected to pressure boosting through a solution pump P2, passes through a low-temperature solution heat exchanger H1 to release heat and reduce temperature to the solution in a dilute solution pipeline 1-1 from a low-pressure absorber A1 under the action of pressure difference and potential difference, and finally flows into a low-pressure absorber A1 through a pipeline 15-1; or flows into the pipeline 15-1 and then joins the pipeline 15-2, namely is mixed with the solution in the dilute solution pipeline 1-2 from the high-pressure evaporator E2 and then enters the low-pressure absorber A1. The solution entering the low pressure absorber a1 absorbs the heat of the condensed steam from the low pressure evaporator E1, and then the temperature rises, and the diluted solution enters the first solution pipeline again for the next circulation.
The solution flowing out of the low-pressure absorber A1 is sent into the high-pressure evaporator E2 again through the dilute solution pipeline 1-2 by the solution pump P4, the solution is cooled and cooled in the high-pressure evaporator E2, refrigerant water is heated and evaporated, and formed refrigerant steam is conveyed into the high-pressure absorber A2 through the second refrigerant steam pipeline 9.
The solution loop is completed.
The low-temperature hot water in the hot water pipeline 14 from the hot user enters the high-pressure absorber A2 and the condenser C in sequence to absorb heat and raise the temperature, and then is conveyed to the hot user through a water supply pipeline, so that the heat generated by the high-pressure absorber A2 and the condenser C is conveyed to the hot user, and a hot water loop is completed.
Optionally, the solutions in the first solution pipeline 1, the second solution pipeline 2, the third solution pipeline 3 and the fourth solution pipeline 4 are lithium bromide aqueous solution, calcium chloride aqueous solution and lithium nitrate aqueous solution.
Optionally, the refrigerants in the refrigerant pipeline 6, the first refrigerant steam pipeline 5, the first refrigerant water pipeline 7, the second refrigerant water pipeline 8, the second refrigerant steam pipeline 9, the third refrigerant water pipeline 10 and the third refrigerant steam pipeline 11 are all water.
Optionally, the low-temperature heat source in the first low-temperature heat source 12 is seawater, river water, lake water, sewage, wastewater, brine, slurry, lithium bromide aqueous solution, calcium chloride aqueous solution, sodium chloride aqueous solution, industrial circulating water, or the like.
Alternatively, the hot water in the hot water pipe 14 may be used for heating, domestic hot water, or process heat production.
Alternatively, the driving heat source 18 is steam, hot water, high temperature flue gas, electricity or fuel.
Example two:
fig. 2 is a schematic view of a low-temperature heat source absorption heat pump circulation system according to a second embodiment of the present invention.
Referring to fig. 2, compared with the first embodiment, an air heat collector AE and a low-temperature heat source circulation pump P6 are added to the first embodiment.
In this embodiment, the cyclic flow portion shown in fig. 1 is used to implement this embodiment, and details have been already described in the first embodiment of the present invention, and details are not repeated below, so that the flow except the cyclic flow portion shown in fig. 1 is mainly described.
Compared with the first embodiment, the present embodiment adds the air heat collector AE and the low temperature heat source circulating pump P6, and introduces the liquid refrigerant water flowing out of the third refrigerant water pipeline 10 in the high pressure evaporator E2 into the low pressure evaporator E1, forming the circulation flow shown in fig. 2. So that the solution in the pipe is utilized to the maximum possible extent.
Specifically, the air heater AE and the low-pressure evaporator E1 form a circulating loop. And exchanging heat between the first low-temperature heat source 12 and outdoor air, mixing the heated first low-temperature heat source 12 and liquid refrigerant water flowing out of the third refrigerant water pipeline 10, and then entering the low-pressure evaporator E1 again.
In this embodiment, the low-temperature heat source in the first low-temperature heat source 12 flowing out of the low-pressure evaporator E1 is liquid water or brine, is boosted by the low-temperature heat source circulation pump P6, flows through the air heat collector AE, extracts heat energy from ambient air, is increased in temperature, and is then mixed with the liquid refrigerant water flowing out of the third refrigerant water pipeline 10 in the high-pressure evaporator E2, and enters the low-pressure evaporator E1.
One part of liquid water is evaporated into refrigerant steam, meanwhile, the other part of the remaining liquid absorbs heat to cool the liquid, the cooled liquid flows out of the low-pressure evaporator E1 again, and enters the air heat collector AE after being boosted by the low-temperature heat source circulating pump P6, and a low-temperature heat source loop is completed.
Optionally, the air heat extractor AE is a dividing wall type heat exchanger, so that compared with the first embodiment, the solution and the refrigerant are circulated inside the equipment and are not directly communicated with the outside, which is beneficial to cleaning and corrosion prevention inside the equipment.
Optionally, the low-temperature heat source in the first low-temperature heat source 12 is water, a lithium bromide aqueous solution, a calcium chloride aqueous solution, a sodium chloride aqueous solution, or an aqueous solution of other salts and acids.
Optionally, the air heat collector AE is a heat exchanger comprising the first low temperature heat source 12 and other gaseous or liquid low temperature media, such as a seawater heat collector, a sewage heat collector, etc.
Alternatively, the liquid refrigerant water in the third refrigerant water pipe 10 is not mixed with the first low temperature heat source 12, but is directly introduced into the low pressure evaporator E1.
Example three:
fig. 3 is a schematic view of a low-temperature heat source absorption heat pump circulation system according to a third embodiment of the present invention.
Referring to fig. 3, compared to the first embodiment, in this embodiment, a second low-temperature heat source 17 is added on the basis of the first embodiment, and a second heat transfer tube bundle is correspondingly added in the high-pressure evaporator E2.
In this embodiment, the cyclic flow portion shown in fig. 1 is used to implement this embodiment, and details have been already described in the first embodiment of the present invention, and details are not repeated below, so that the flow except the cyclic flow portion shown in fig. 1 is mainly described.
In this embodiment, compared with the first embodiment, a second heat transfer tube bundle is added to the high-pressure evaporator E2, and the second low-temperature heat source 17 flows through the second heat transfer tube bundle, so that the circulation flow shown in fig. 3 is formed.
The second low-temperature heat source circuit is composed of the high-pressure evaporator E2 and external heat extraction equipment, piping, and the like. Only the circulation system of the plant is shown in fig. 3, and not all the components in each circuit are shown.
Specifically, the second low temperature heat source 17 is water from the outside, such as water in rivers, lakes, seas, sewage, etc., whose temperature is higher than that of the first low temperature heat source 12. The second low-temperature heat source 17 heats and evaporates the refrigerant water outside the second heat transfer tube bundle in the high-pressure evaporator E2 to form refrigerant vapor; and the cooled heat energy flows out of the high-pressure evaporator E2 through the second heat transfer tube bundle to achieve the purpose of extracting low-temperature heat energy from the external environment, thereby completing a second low-temperature heat source loop.
Optionally, the second low-temperature heat source 17 is water, brine, glycol antifreeze solution, or the like.
When two low-temperature heat sources with different temperatures exist, the performance of the heat pump can be greatly improved by adopting the circulation flow of the absorption heat pump compared with the first embodiment.
Example four:
fig. 4 is a schematic view of a low-temperature heat source absorption heat pump circulation system according to the fourth embodiment of the present invention.
Referring to fig. 4, compared with the third embodiment, in the third embodiment, the first valve VA, the second valve VB, the third valve VC, and the eighth valve VD are added to form the cyclic flow shown in fig. 4.
The working principle of the process is as follows:
when the first valve VA is closed and the second valve VB, the third valve VC and the eighth valve VD are opened, the process is completely the same as the process of the third embodiment, and the description thereof is omitted.
When the first valve VA is opened, the second valve VB, the third valve VC and the eighth valve VD are closed, and the solution pumps P1 and P4 are stopped, the process is a conventional inverse series double-effect absorption heat pump process, at this time, the low-temperature loop of the first low-temperature heat source 12 stops running, the absorption heat pump only takes heat from the second low-temperature heat source 17, the double-effect absorption heat pump runs completely according to the cycle of the double-effect absorption heat pump, and high performance can be obtained.
The process can also be used for refrigerating operation in summer, wherein the high-pressure evaporator E2, the air conditioner, a cold water pump and the like form a low-temperature heat source pipeline to form a cold water loop, and the cold water loop supplies cold to the air conditioner or cooling equipment in the production process. A hot water circuit including the high-pressure absorber a2, the condenser C, a cooling water pump, a cooling tower, and the like serves as a cooling water circuit, and the heat of absorption of the solution and the heat of condensation of the refrigerant vapor are discharged to the ambient environment.
The absorption heat pump circulating system can fully utilize two low-temperature heat sources with different temperatures to improve the performance of the heat pump, and can also be switched into a refrigeration mode in summer to improve the utilization rate of equipment.
Example five:
fig. 5 is a schematic view of a low-temperature heat source absorption heat pump circulation system according to a fifth embodiment of the present invention.
Referring to fig. 5, compared with the first embodiment, in the present embodiment, on the basis of the first embodiment, a first valve VA, a second valve VB, a third valve VC, and an eighth valve VD are added, and a fourth valve VE, a fifth valve VF, a sixth valve VG, and a seventh valve VH are added.
The sixth valve VG and the seventh valve VH are connected to the second low-temperature heat source 17, and the circulation flow shown in fig. 5 is formed.
The working principle of the process is as follows:
when the first valve VA, the sixth valve VG, and the seventh valve VH are closed, and the second valve VB, the third valve VC, the eighth valve VD, the fourth valve VE, and the fifth valve VF are opened, the process is completely the same as the process in the first embodiment, and details are not described here.
When the second valve VB, the third valve VC, the eighth valve VD, the fourth valve VE and the fifth valve VF are closed, the first valve VA, the sixth valve VG and the seventh valve VH are opened, and the solution pumps P1 and P4 are stopped, the process is the conventional inverse series connection double-effect absorption heat pump process, at the moment, the low-temperature heat source loop of the first low-temperature heat source 12 stops running, the absorption heat pump only takes heat from the second low-temperature heat source 17, the absorption heat pump completely runs according to the circulation of the double-effect absorption heat pump, and higher performance can be obtained.
The process can also be used for refrigerating operation in summer, and at the moment, the high-pressure evaporator E2, the air conditioner, the cold water pump and the like form a low-temperature heat source loop to form a cold water loop for supplying cold to the air conditioner or cooling equipment in the production process; a hot water circuit including the high-pressure absorber a2, the condenser C, a cooling water pump, a cooling tower, and the like serves as a cooling water circuit, and the heat of absorption of the solution and the heat of condensation of the refrigerant vapor are discharged to the ambient environment.
The circulation flow of the absorption heat pump has similar functions compared with the fourth embodiment, but can save the heat transfer area of the high-pressure evaporator E2.
Example six:
fig. 6 is a schematic view of a low-temperature heat source absorption heat pump circulation system according to a sixth embodiment of the present invention.
Referring to fig. 6, compared to the third embodiment, in the third embodiment, on the basis of the third embodiment, a high-temperature flue gas heat exchanger GEH, a low-temperature flue gas heat exchanger GHL, and a low-temperature heat source circulating pump P7 are added, so as to form the circulating flow shown in fig. 6.
In this embodiment, the loop flow part shown in the third embodiment is used to implement this embodiment, and details have been already described in the third embodiment of the present invention, and details are not repeated below, so that the flow except the loop flow part shown in fig. 3 is mainly described.
Specifically, the driving heat source 18 of the high-pressure generator G2 is high-temperature flue gas generated by mixing and burning natural gas and combustion-supporting air, and the flue gas flowing out of the high-pressure generator G2 firstly enters the high-temperature flue gas heat exchanger GEH to exchange heat with hot water output from the condenser C to heat the hot water; the cooled flue gas enters the low-temperature flue gas heat exchanger GEL again, the low-temperature circulating water from the high-pressure evaporator E2 is heated, and the flue gas after further cooling flows out of the low-temperature flue gas heat exchanger GEL and is discharged to the environment.
Hot water from a heat user is a low-temperature heat source, and enters the high-pressure absorber A2, the condenser C and the high-temperature flue gas heat exchanger GEH in sequence to absorb heat and raise the temperature, and then is conveyed to the heat user through a water supply pipeline, so that heat generated by the high-pressure absorber A2, the condenser C and the high-temperature flue gas heat exchanger GEH is conveyed to the heat user, and a hot water loop of the low-temperature absorption heat pump cycle is completed.
The low-temperature circulating water enters a heat transfer pipeline of the high-pressure evaporator E2, refrigerant water outside the heating pipe is evaporated to form refrigerant steam, the low-temperature circulating water is cooled and flows out of the high-pressure evaporator E2, enters the low-temperature flue gas heat exchanger GEL to absorb heat and raise the temperature and then returns to the high-pressure evaporator E2, and a low-temperature heat source loop of the low-temperature absorption heat pump cycle is completed.
Optionally, the low-temperature flue gas heat exchanger GEL and the high-temperature flue gas heat exchanger GEH are dividing wall type heat exchangers or direct contact type heat exchangers.
Example seven:
fig. 7 is a schematic view of a low-temperature heat source absorption heat pump circulation system according to a seventh embodiment of the present invention.
Referring to fig. 7 and fig. 1, compared to the first embodiment, the present embodiment adds an air heat collector AE and a low-temperature heat source circulation pump P6 on the basis of the first embodiment.
In this embodiment, the cyclic flow portion shown in fig. 1 is used to implement this embodiment, and details have been already described in the first embodiment of the present invention, and details are not repeated below, so that the flow except the cyclic flow portion shown in fig. 1 is mainly described.
In this embodiment, compared with the first embodiment, an air heat collector AE and a low-temperature heat source circulation pump P6 are added to form the circulation flow shown in fig. 7.
In this embodiment, the first low-temperature heat source flowing out of the low-pressure evaporator E1 is liquid water or brine, and is boosted by the low-temperature heat source circulation pump P6, and the first low-temperature heat source 12 flows through the air heat collector AE to directly contact with the ambient air for heat exchange, so as to extract heat energy from the ambient air, and further raise the temperature, and enters the low-pressure evaporator E1 for heat absorption and evaporation.
In the low-pressure evaporator E1, a part of liquid water is evaporated into refrigerant vapor, which is output from the third refrigerant vapor pipe 11, and simultaneously absorbs heat from the remaining liquid in the evaporation process to cool the liquid, and the cooled liquid flows out of the low-pressure evaporator E1, and enters the air heat collector AE after being boosted by the low-temperature heat source circulating pump P6, thereby completing the low-temperature heat source loop.
Compared with the two embodiments, the air heat collector AE is a direct contact heat exchanger, and condensed water or frost generated by cooling water vapor in the air is directly absorbed by the first low-temperature heat source.
Optionally, the first low-temperature heat source is water, an aqueous solution of lithium bromide, an aqueous solution of calcium chloride, an aqueous solution of sodium chloride, or an aqueous solution of other salts and acids.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention.
The invention aims to protect a low-temperature heat source absorption heat pump circulating system, wherein a low-temperature heat source releases heat in a low-pressure evaporator E1 to generate refrigerant steam and enters a low-pressure absorber A1, a dilute solution is generated after the refrigerant steam is absorbed in a low-pressure absorber A1, one part of the dilute solution enters a high-pressure evaporator E2, the other part of the dilute solution sequentially passes through a low-pressure generator G1 and a high-pressure generator G2 to be concentrated, the concentrated solution enters a high-pressure absorber A2 to absorb the refrigerant steam, the concentrated solution is mixed with the heat source solution of the high-pressure evaporator E2 to enter the low-pressure absorber A1 again; refrigerant steam generated by the high-pressure generator G2 is used as a heat source of the low-pressure generator G1, the refrigerant steam and condensed water generated by heat release and condensation in the low-pressure generator G1 are condensed and released in the condenser C, and the generated refrigerant water enters the high-pressure evaporator E2 to be evaporated, and meanwhile, redundant refrigerant water is discharged through a pipeline. The heat energy (sensible heat and/or latent heat of solidification) is extracted from a low-temperature heat source with very low temperature (which can be lower than 0 ℃) by utilizing high-quality heat source driving; the useful heat energy of the middle temperature is generated, thereby greatly improving the utilization efficiency of the heat energy.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (10)
1. A low-temperature heat source absorption heat pump circulating system is characterized by comprising: a low pressure generator (G1), a high pressure generator (G2), a condenser (C), a low pressure evaporator (E1), a high pressure evaporator (E2), a low pressure absorber (A1), a high pressure absorber (A2);
the high-temperature heat source generates refrigerant steam after heating the concentrated solution in the high-pressure generator (G2), and a refrigerant steam outlet of the high-pressure generator (G2) is communicated with a refrigerant steam inlet of the low-pressure generator (G1) through a refrigerant pipeline (6) and transmits the refrigerant steam to the low-pressure generator (G1);
the refrigerant steam outlet of the low-pressure generator (G1) is communicated with the condenser (C) through a first refrigerant steam pipeline (5), and the refrigerant water outlet of the low-pressure generator (G1) is communicated with the condenser (C) through a first refrigerant water pipeline (7);
the refrigerant outlet of the condenser (C) is communicated with the refrigerant water inlet of the high-pressure evaporator (E2) through a second refrigerant water pipeline (8);
the refrigerant steam outlet of the high-pressure evaporator (E2) is communicated with the refrigerant steam inlet of the high-pressure absorber (A2) through a second refrigerant steam pipeline (9), a part of refrigerant water in the high-pressure evaporator (E2) is evaporated and then enters the high-pressure absorber (A2) through the second refrigerant steam pipeline (9), and the other part of refrigerant water is discharged through a third refrigerant water pipeline (10) communicated with the high-pressure evaporator (E2);
a low-temperature heat source enters the low-pressure evaporator (E1) to be evaporated to form refrigerant steam, and a refrigerant steam outlet of the low-pressure evaporator (E1) is communicated with the low-pressure absorber (A1) through a third refrigerant steam pipeline (11) and transmits the refrigerant steam to the low-pressure absorber (A1);
a dilute solution outlet of the low-pressure absorber (A1) is communicated with a dilute solution pipeline (1), the dilute solution pipeline (1) is divided into two paths, one path of dilute solution pipeline (1-1) is communicated with a dilute solution inlet of the low-pressure generator (G1), and the other path of dilute solution pipeline (1-2) is communicated with a heat source inlet of the high-pressure evaporator (E2);
the solution outlet of the low-pressure generator (G1) is communicated with the solution inlet of the high-pressure generator (G2) through a solution pipeline, the solution outlet of the high-pressure generator (G2) is communicated with the solution inlet of the high-pressure absorber (A2) through a solution pipeline, and the solution outlet of the high-pressure absorber (A2) is communicated with the solution inlet of the low-pressure absorber (A1); or
The solution outlet of the high-pressure absorber (A2) is firstly merged with the heat source outlet solution of the high-pressure evaporator (E2) and then communicated with the solution inlet of the low-pressure absorber (A1) through a solution pipeline (15).
2. The system of claim 1, further comprising: a low-temperature solution heat exchanger (H1), a medium-temperature solution heat exchanger (H2), a high-temperature solution heat exchanger (H3);
the solution outlet of the high pressure absorber (A2) is communicated with the hot fluid side inlet of the low temperature solution heat exchanger (H1) through a solution pipeline, and the hot fluid side outlet of the low temperature solution heat exchanger (H1) is communicated with the solution pipeline (15);
the one-way dilute solution pipeline (1-1) of the solution outlet of the low-pressure absorber (A1) is communicated with the cold fluid side inlet of the low-temperature solution heat exchanger (H1), the cold fluid side outlet of the low-temperature solution heat exchanger (H1) is communicated with the cold fluid side inlet of the medium-temperature solution heat exchanger (H2), and the cold fluid side outlet of the medium-temperature solution heat exchanger (H2) is communicated with the solution inlet of the low-pressure generator (G1);
the solution outlet of the low pressure generator (G1) is in communication with the cold fluid side inlet of the high temperature solution heat exchanger (H3), the cold fluid side outlet of the high temperature solution heat exchanger (H3) is in communication with the solution inlet of the high pressure generator (G2);
the solution outlet of the high-pressure generator (G2) is communicated with the hot fluid side inlet of the high-temperature solution heat exchanger (H3), the hot fluid side outlet of the high-temperature solution heat exchanger (H3) is communicated with the hot fluid side inlet of the medium-temperature solution heat exchanger (H2), and the hot fluid side outlet of the medium-temperature solution heat exchanger (H2) is communicated with the solution inlet of the high-pressure absorber (A2).
3. The system of claim 1, further comprising: an air heat exchanger (AE);
the solution outlet of the low-pressure evaporator (E1) is communicated with the heat taking side inlet of the air heat collector (AE) through a pipeline of a first low-temperature heat source (12), and the solution flowing out of the low-pressure evaporator (E1) absorbs heat in the air heat collector (AE) and is heated up, and then enters the low-pressure evaporator (E1) again through a low-temperature heat source pipeline (16) as a low-temperature heat source.
4. The system of claim 3,
the air heat collector (AE) is a dividing wall type heat exchanger or a direct contact type heat exchanger;
when the air heat collector (AE) is a dividing wall type heat exchanger, the third refrigerant water pipeline (10) is communicated with the low-temperature heat source pipeline (16) or the pipeline of the first low-temperature heat source (12), and the other part of refrigerant water of the high-pressure evaporator (E2) is conveyed to the low-pressure evaporator (E1) and is mixed with the low-temperature heat source after absorbing heat and raising temperature.
5. The system of claim 1, further comprising: a second low temperature heat source (17);
the heat transfer tube bundle of the high-pressure evaporator (E2) is divided into a first heat transfer tube bundle and a second heat transfer tube bundle, the first heat transfer tube bundle is in circulating communication with the low-pressure absorber (A1);
the second heat transfer tube bundle is in circulating communication with the second cryogenic heat source (17).
6. The system of claim 5, further comprising: a high-temperature flue gas heat exchanger (GEH), a low-temperature flue gas heat exchanger (GHL) and a flue gas pipeline (13);
a flue gas outlet of the high-pressure generator (G2) is communicated with a flue gas inlet of the high-temperature flue gas heat exchanger (GEH) through the flue gas pipeline (13), a flue gas outlet of the high-temperature flue gas heat exchanger (GEH) is communicated with a flue gas inlet of the low-temperature flue gas heat exchanger (GHL), and a flue gas outlet of the low-temperature flue gas heat exchanger (GHL) is communicated with the external environment;
a water side inlet of the high-temperature flue gas heat exchanger (GEH) is communicated with a water side outlet of the condenser (C), and a water side outlet of the high-temperature flue gas heat exchanger (GEH) is communicated with a hot user;
the low-temperature flue gas heat exchanger (GHL) is used as the second low-temperature heat source (17) and is in circulating communication with the second heat transfer tube bundle.
7. The system of claim 5 or 6,
the high-pressure generator (G2) is a direct-fired generator.
8. System according to claim 2 or 5, further comprising a first Valve (VA), a second Valve (VB), a third Valve (VC);
the second Valve (VB) is arranged between the solution outlet of the high-pressure absorber (A2) and the hot-side inlet of the low-temperature solution heat exchanger (H1), and the first Valve (VA) is arranged between the solution outlet of the high-pressure absorber (A2) and the cold-side inlet of the medium-temperature solution heat exchanger (H2);
the third Valve (VC) is arranged between the cold side outlet of the low-temperature solution heat exchanger (H1) and the cold side inlet of the medium-temperature solution heat exchanger (H2).
9. The system according to claim 5, further comprising a fourth Valve (VE), a fifth Valve (VF), a sixth Valve (VG), a seventh Valve (VH);
said high-pressure evaporator (E2) internally containing a heat transfer tube bundle in circulating communication with said low-pressure absorber (A1) while said heat transfer tube bundle is in circulating communication with said second cryogenic heat source (17);
the fourth Valve (VE) is arranged between the heat source outlet of the heat transfer tube bundle and the solution inlet of the low-pressure absorber (A1), and the fifth Valve (VF) is arranged between the solution outlet of the low-pressure absorber (A1) and the heat source inlet of the heat transfer tube bundle;
the seventh Valve (VH) is arranged between the heat source outlet of the heat transfer tube bundle and the second low-temperature heat source (17), and the sixth Valve (VG) is arranged between the heat source inlet of the heat transfer tube bundle and the second low-temperature heat source (17).
10. The system of claim 1,
the low pressure evaporator (E1) and the low pressure absorber (A1) are disposed in the same cylinder to reduce the flow resistance of refrigerant vapor in the third refrigerant vapor pipe (11);
the high-pressure evaporator (E2) and the high-pressure absorber (A2) are arranged in the same cylinder to reduce the flow resistance of the refrigerant vapor in the second refrigerant vapor pipe (9);
the low pressure generator (G1) and the condenser (C) are disposed in the same cylinder to reduce flow resistance of refrigerant vapor in the first refrigerant water pipe (7).
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| CN113566423B (en) * | 2021-08-03 | 2024-10-08 | 双良节能系统股份有限公司 | Large-temperature-rise two-stage type second lithium bromide absorption heat pump water heater unit |
| CN114278977B (en) * | 2021-12-27 | 2023-09-22 | 北京华源泰盟节能设备有限公司 | Low-level heat source waste heat recycling device |
| CN117450687B (en) * | 2023-12-21 | 2024-03-15 | 安徽普泛能源技术有限公司 | Multi-heat source multi-stage cold absorption refrigerating unit and process for energy cascade utilization |
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