CN113686046A - Second-class absorption heat pump system and method based on generation liquid flash evaporation - Google Patents
Second-class absorption heat pump system and method based on generation liquid flash evaporation Download PDFInfo
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- CN113686046A CN113686046A CN202110907805.4A CN202110907805A CN113686046A CN 113686046 A CN113686046 A CN 113686046A CN 202110907805 A CN202110907805 A CN 202110907805A CN 113686046 A CN113686046 A CN 113686046A
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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
- F25B15/04—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas the refrigerant being ammonia evaporated from aqueous solution
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B15/00—Sorption machines, plants or systems, operating continuously, e.g. absorption type
- F25B15/02—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas
- F25B15/06—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas the refrigerant being water vapour evaporated from a salt solution, e.g. lithium bromide
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B27/00—Machines, plants or systems, using particular sources of energy
- F25B27/02—Machines, plants or systems, using particular sources of energy using waste heat, e.g. from internal-combustion engines
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
- Y02A30/274—Relating to heating, ventilation or air conditioning [HVAC] technologies using waste energy, e.g. from internal combustion engine
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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]
- Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
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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
- Y02B30/625—Absorption based systems combined with heat or power generation [CHP], e.g. trigeneration
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- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Combustion & Propulsion (AREA)
- Sorption Type Refrigeration Machines (AREA)
Abstract
The invention discloses a second-class absorption heat pump system based on generation liquid flash evaporation, which comprises a generator, a generator heat exchanger, a condenser, a refrigerant pump, an evaporator, a high-pressure absorber heat exchanger, a heat recoverer, a high-pressure throttle valve, a low-pressure absorber heat exchanger, a concentrated solution pump, a dilute solution pump, a flash evaporator heat exchanger and a low-pressure throttle valve. According to the invention, the low-concentration absorption liquid is obtained by throttling and depressurizing the generation liquid in the generator and carrying out flash evaporation, and the low-concentration absorption liquid absorbs the refrigerant vapor of the generator, so that the low-concentration absorption liquid can obtain higher absorption liquid temperature under the condition of a certain waste heat source temperature, and thus higher heating temperature can be provided.
Description
Technical Field
The invention relates to an absorption heat pump system, in particular to a second-class absorption heat pump system based on high-pressure generation liquid flash evaporation, and belongs to the technical field of absorption heat pumps.
Background
Industrial processes are accompanied by the production of large amounts of low temperature waste heat, typically below 100 ℃, which is generally not re-usable by industrial processes due to its low energy grade. The low-grade waste heat is reasonably and effectively utilized, and the method has important significance for improving the energy utilization efficiency in the industrial production process and reducing the production energy consumption.
The second type of absorption heat pump, also called temperature-increasing absorption heat pump, is driven by low-temperature waste heat to produce a small amount of high-temperature heat. The second type of absorption heat pump can be classified into an ammonia-water system and a water-lithium bromide system according to the difference of absorption working medium pairs. The conventional single-stage second-type absorption heat pump system is limited by factors such as low-temperature heat source temperature, working medium pair air release coefficient, refrigerant condensation pressure and the like, and the system temperature rise is small and generally not higher than 20 ℃ when the low-temperature heat source is driven. For example, when the temperature of the driving heat source is 65 ℃, the heat generation temperature is about 80 ℃, the temperature rise is less than 20 ℃ and the application range of the second-type absorption heat pump is limited to a certain extent.
Disclosure of Invention
The invention aims to provide a second-class absorption heat pump based on generation liquid flash evaporation aiming at the defects of the prior art, and the second-class absorption heat pump can effectively improve the heat supply temperature of a second-class absorption heat pump system driven by a low-temperature heat source.
The invention relates to a second-class absorption heat pump system based on generation liquid flash evaporation, which comprises a generator, a generator heat exchanger, a condenser, a refrigerant pump, an evaporator, a high-pressure absorber heat exchanger, a heat recoverer, a high-pressure throttle valve, a low-pressure absorber heat exchanger, a concentrated solution pump, a dilute solution pump, a flash evaporator heat exchanger and a low-pressure throttle valve.
The generator is provided with a refrigerant steam outlet, a solution inlet, a waste heat medium (such as low-temperature hot water, low-temperature steam and the like) inlet and a waste heat medium outlet, and a generator heat exchanger is arranged in the generator;
the condenser is provided with a refrigerant steam inlet, a refrigerant liquid outlet, a cooling water inlet and a cooling water outlet;
the refrigerant pump is provided with a refrigerant liquid inlet and a refrigerant liquid outlet;
the evaporator is provided with a refrigerant liquid inlet, a refrigerant steam outlet, a waste heat medium inlet and a waste heat medium outlet;
the high-pressure absorber is provided with a refrigerant steam inlet, a solution outlet, a heat supply medium inlet and a heat supply medium outlet, and a high-pressure absorber heat exchanger is arranged in the high-pressure absorber;
the heat recoverer is provided with a dilute solution inlet, a dilute solution outlet, a concentrated solution inlet and a concentrated solution outlet;
the high-pressure throttle valve is provided with a solution inlet and a solution outlet;
the low-pressure absorber is provided with a flash refrigerant steam inlet, a solution outlet, a cooling water inlet and a cooling water outlet, and a low-pressure absorber heat exchanger is arranged in the low-pressure absorber;
the concentrated solution pump is provided with a solution inlet and a solution outlet;
the dilute solution pump is provided with a solution inlet and a solution outlet;
the flash evaporator is provided with a flash evaporation refrigerant steam outlet, a solution inlet, a solution outlet, a waste heat medium inlet and a waste heat medium outlet, and a flash evaporator heat exchanger is arranged in the flash evaporator;
the low-pressure throttle valve is provided with a solution inlet and a solution outlet.
A refrigerant steam outlet of the generator is connected with a refrigerant steam inlet of the condenser, a generator heat exchanger is arranged in the generator, and the generator heat exchanger is respectively connected with a waste heat medium inlet and a waste heat medium outlet of the generator; the refrigerant liquid outlet of the condenser is connected with the refrigerant liquid inlet of the refrigerant pump; a refrigerant liquid outlet of the refrigerant pump is connected with a refrigerant liquid inlet of the evaporator; a refrigerant liquid outlet of the evaporator is connected with a refrigerant steam inlet of the high-pressure absorber, a solution inlet is connected with a dilute solution outlet of the heat recoverer, a solution outlet is connected with a concentrated solution inlet of the heat recoverer, and a heat exchanger of the high-pressure absorber is connected with a heat supply medium inlet and a heat supply medium outlet; a concentrated solution outlet of the heat recoverer is connected with a solution inlet of the high-pressure throttling valve, and a dilute solution inlet of the heat recoverer is connected with an outlet of the dilute solution pump; a solution outlet of the high-pressure throttle valve is connected with a solution inlet of the low-pressure absorber, a refrigerant steam inlet of the low-pressure absorber is connected with a refrigerant steam outlet of the flash evaporator, a solution outlet of the low-pressure absorber is connected with an inlet of the concentrated solution pump, and a heat exchanger of the low-pressure absorber is respectively connected with a cooling water inlet and a cooling water outlet of the low-pressure absorber; a solution outlet of the concentrated solution pump is connected with a solution inlet of the generator; a solution outlet of the flash evaporator is connected with a solution inlet of the dilute solution pump, a solution inlet of the flash evaporator is connected with a solution outlet of the low-pressure throttle valve, and a heat exchanger of the flash evaporator is respectively connected with a waste heat medium inlet and a waste heat medium outlet of the flash evaporator; the solution outlet of the generator is connected with the inlet of the low-pressure throttle valve.
The absorption working medium pair adopted by the system is ammonia-water, wherein ammonia is a refrigerant, and water is an absorbent; or water-lithium bromide, wherein water is used as a refrigerant and lithium bromide is used as an absorbent.
Preferably: when the system adopts ammonia-water as a working medium pair, the generator adopts a generator with a rectification function.
Preferably: the heat recoverer adopts a plate type heat exchanger or a shell-and-tube type heat exchanger.
The invention relates to a second-class absorption heat pump based on generation liquid flash evaporation, which comprises the following working methods:
the waste heat medium heats the working medium pair through the generator heat exchanger, the refrigerant is evaporated and then enters the condenser to release heat and liquefy, the refrigerant liquid enters the evaporator after being pressurized by the refrigerant pump and then is heated by the waste heat to become high-pressure refrigerant steam, and the refrigerant steam enters the high-pressure absorber; the solution of the generator is decompressed by a throttle valve and then enters a flash evaporator, the solution is heated by waste heat and then is gasified again under the low-pressure condition, the concentration of the solution is further reduced, the solution of the flash evaporator passes through a dilute solution pump and then enters a high-pressure absorber through a heat recoverer, and refrigerant steam of an evaporator is absorbed under the high-pressure condition; the high-temperature solution of the high-pressure absorber outputs high-temperature heat outwards through the high-pressure absorber heat exchanger; then the solution in the high-pressure absorber is decompressed by the high-pressure throttle valve after passing through the heat recoverer, enters the low-pressure absorber, absorbs low-pressure refrigerant steam from the flash evaporator, absorbs heat release, is released to the environment through circulating water, and the solution in the low-pressure absorber enters the generator after being pressurized by the concentrated solution pump, and starts the next circulation.
Compared with the prior art, the invention has the beneficial effects that:
according to the second-class absorption heat pump system based on the generation liquid flash evaporation, the generation liquid (working medium pair) in the generator is throttled and depressurized, the low-concentration absorption liquid is obtained through flash evaporation, refrigerant steam of the generator is absorbed through the low-concentration absorption liquid, and the low-concentration absorption liquid can obtain higher absorption liquid temperature under the condition that the temperature of a waste heat source is constant, so that higher heat supply temperature can be provided.
Drawings
Fig. 1 is a schematic diagram of a second-type absorption heat pump system based on generation liquid flash evaporation according to a first embodiment of the present invention;
in the figure, 1 is a generator, 2 is a generator heat exchanger, 3 is a condenser, 4 is a refrigerant pump, 5 is an evaporator, 6 is a high-pressure absorber, 7 is a high-pressure absorber heat exchanger, 8 is a heat recoverer, 9 is a high-pressure throttle valve, 10 is a low-pressure absorber, 11 is a low-pressure absorber heat exchanger, 12 is a concentrated solution pump, 13 is a dilute solution pump, 14 is a flash evaporator, 15 is a flash evaporator heat exchanger, and 16 is a low-pressure throttle valve.
FIG. 2 is a schematic diagram of a comparative example system;
in the figure, a is a generator, b is a generator heat exchanger, c is a condenser, d is a refrigerant pump, e is an evaporator, f is an absorber, g is an absorber heat exchanger, h is a heat recoverer, i is a throttle valve, and j is a solution pump.
Detailed Description
The invention will be described in further detail with reference to the following figures and specific examples, which are given by way of illustration only and are not intended to limit the scope of the invention.
The first embodiment is as follows:
as shown in fig. 1, in the second type of absorption heat pump based on liquid flash evaporation of this embodiment, the system uses an ammonia-water working medium as a working medium pair. The system comprises a generator 1, a generator heat exchanger 2, a condenser 3, a refrigerant pump 4, an evaporator 5, a high-pressure absorber 6, a high-pressure absorber heat exchanger 7, a heat recoverer 8, a high-pressure throttle valve 9, a low-pressure absorber 10, a low-pressure absorber heat exchanger 11, a concentrated solution pump 12, a dilute solution pump 13, a flash evaporator 14, a flash evaporator heat exchanger 15 and a low-pressure throttle valve 16.
A refrigerant steam outlet of the generator is connected with a refrigerant steam inlet of the condenser, a generator heat exchanger is arranged in the generator, and the generator heat exchanger is respectively connected with a waste heat medium inlet and a waste heat medium outlet of the generator; the top of the generator is provided with a rectifying device for purifying ammonia gas. A refrigerant liquid outlet of the condenser is connected with a refrigerant liquid inlet of the refrigerant pump; a refrigerant liquid outlet of the refrigerant pump is connected with a refrigerant liquid inlet of the evaporator; a refrigerant liquid outlet of the evaporator is connected with a refrigerant steam inlet of the high-pressure absorber, a solution inlet of the high-pressure absorber is connected with a dilute solution outlet of the heat recoverer, a solution outlet of the high-pressure absorber is connected with a concentrated solution inlet of the heat recoverer, and a heat exchanger of the high-pressure absorber is respectively connected with a heat supply medium inlet and a heat supply medium outlet; a concentrated solution outlet of the heat recoverer is connected with a solution inlet of the high-pressure throttle valve, and a dilute solution inlet of the heat recoverer is connected with an outlet of the dilute solution pump; the heat recovery device adopts a plate heat exchanger. The solution outlet of the high-pressure throttle valve is connected with the solution inlet of the low-pressure absorber, the refrigerant steam inlet of the low-pressure absorber is connected with the refrigerant steam outlet of the flash evaporator, the solution outlet of the low-pressure absorber is connected with the inlet of the concentrated solution pump, and the heat exchanger of the low-pressure absorber is respectively connected with the cooling water inlet and the cooling water outlet of the low-pressure absorber; the solution outlet of the concentrated solution pump is connected with the solution inlet of the generator; a solution outlet of the flash evaporator is connected with a solution inlet of the dilute solution pump, a solution inlet is connected with a solution outlet of the low-pressure throttle valve, and a heat exchanger of the flash evaporator is connected with a waste heat medium inlet and a waste heat medium outlet of the flash evaporator; the solution outlet of the generator is connected with the inlet of the low-pressure throttle valve.
The working method of the embodiment is as follows: waste heat steam (the temperature is 65 ℃) passes through a generator heat exchanger heater ammonia-water working medium pair, the generation temperature is 60 ℃, and the generation pressure is 13.5 bar; the ammonia is evaporated, rectified and purified through the top of the generator and then enters a condenser, the condensation temperature is 35 ℃, the condensation pressure is 13.5bar, the refrigerant liquid is pressurized to 26.1bar through a refrigerant pump and enters an evaporator for evaporation, the evaporation pressure is 26.1bar, the evaporation temperature is 60 ℃, and the ammonia obtained by evaporation enters a high-pressure absorber. The solution (ammonia concentration is 64.3%) discharged from the generator is reduced to 8bar through a throttle valve, enters a flash evaporator, is reheated by 65 ℃ waste heat steam under the condition of 8bar pressure, the liquid discharge concentration of the flash evaporator is 47.7%, the temperature is 60 ℃, 47.7% of solution is pressurized to 26.1bar through a dilute solution pump, the liquid discharge heat of the high-pressure absorber is recovered through a heat recovery device, then enters the high-pressure absorber, the ammonia gas from the evaporator is absorbed, the absorption pressure is 26.1bar, the absorption heat supply temperature is 93.9 ℃, and the liquid discharge ammonia concentration is 59.2%; then, the ammonia gas is decompressed to 8bar through a heat recoverer and a high-pressure throttle valve, enters a low-pressure absorber, absorbs low-pressure ammonia gas from a flash evaporator, and absorbs ammonia gas at the absorption pressure of 8bar, the absorption temperature of 35 ℃ and the concentration of absorbed liquid ammonia of 70.0 percent; the heat released by the low-pressure absorber is released by circulating water, and the solution of 70.0% in the low-pressure absorber is pumped to 13.5bar by a concentrated solution pump and then returns to the generator.
In the embodiment, 65 ℃ waste heat is used as a driving heat source, the generation liquid in the generator is throttled and depressurized, the low-concentration absorption liquid is obtained through flash evaporation, the low-concentration absorption liquid absorbs refrigerant steam of the generator, the heating temperature of 93.9 ℃ is finally provided, and the waste heat temperature (65 ℃) is increased by 28.9 ℃ through the system.
Comparative example one:
as shown in fig. 2, in the comparative example, a conventional second-type absorption heat pump system is adopted, ammonia-water is adopted as a working medium pair, a generator a is driven by 65 ℃ waste heat steam of a generator heat exchanger, the generation pressure is 13.5bar, the temperature of a generated solution is 60 ℃, ammonia gas generated by the generator enters a condenser c for heat dissipation and liquefaction, the pressure is increased to 26.1bar through a refrigerant pump d, the ammonia gas enters an evaporator e and is heated and gasified by 65 ℃ waste heat to be high-pressure ammonia gas, and the high-pressure ammonia gas of 26.1bar enters an absorber f; ammonia water with 64.3% of generator liquid concentration is pressurized to 26.1bar by a solution pump j, enters an absorber f after passing through a heat recovery device h, the absorption pressure is 26.1bar, and the absorber provides heat of 81.8 ℃ to the outside through an absorber heat exchanger g; and then the absorption liquid is decompressed to 13.5bar by a heat recoverer h and a throttle valve i and returns to the generator a.
In the embodiment, the waste heat at 65 ℃ is used as a driving heat source, the temperature of the finally generated heat source is 81.8 ℃, the temperature of the waste heat (65 ℃) is increased by 16.8 ℃ through the system, and the temperature rise amplitude is reduced by 41.9% compared with that of the first embodiment.
Although the present invention has been described in connection with the accompanying drawings, the present invention is not limited to the above-described embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many modifications without departing from the spirit of the present invention, within the scope of the present invention.
Claims (6)
1. A second type absorption heat pump system based on liquid generation flash evaporation is characterized by comprising: a generator, a condenser, an evaporator, a high pressure absorber, a heat recoverer, a low pressure absorber and a flash evaporator;
the generator is provided with a refrigerant steam outlet, a solution inlet, a waste heat medium inlet and a waste heat medium outlet, and the generator is provided with a generator heat exchanger for heating a working medium pair in the generator;
the condenser is provided with a refrigerant steam inlet, a refrigerant liquid outlet, a cooling water inlet and a cooling water outlet;
the evaporator is provided with a refrigerant liquid inlet, a refrigerant steam outlet, a waste heat medium inlet and a waste heat medium outlet;
the high-pressure absorber is provided with a refrigerant steam inlet, a solution outlet, a heat supply medium inlet and a heat supply medium outlet, and the high-pressure absorber is provided with a high-pressure absorber heat exchanger for supplying heat to the outside;
the heat recoverer is provided with a dilute solution inlet, a dilute solution outlet, a concentrated solution inlet and a concentrated solution outlet;
the low-pressure absorber is provided with a flash refrigerant steam inlet, a solution outlet, a cooling water inlet and a cooling water outlet, and the low-pressure absorber is provided with a low-pressure absorber heat exchanger for cooling liquid in the low-pressure absorber;
the flash evaporator is provided with a flash refrigerant steam outlet, a solution inlet, a solution outlet, a waste heat medium inlet and a waste heat medium outlet, and is provided with a flash evaporator heat exchanger for heating liquid in the flash evaporator;
a refrigerant steam outlet of the generator is connected with a refrigerant steam inlet of the condenser, a generator heat exchanger is arranged in the generator, and the generator heat exchanger is respectively connected with a waste heat medium inlet and a waste heat medium outlet of the generator; the refrigerant liquid outlet of the condenser is connected with the refrigerant liquid inlet of the evaporator through a refrigerant pump; a refrigerant steam outlet of the evaporator is connected with a refrigerant steam inlet of the high-pressure absorber, a solution inlet of the high-pressure absorber is connected with a dilute solution outlet of the heat recoverer, a solution outlet of the high-pressure absorber is connected with a concentrated solution inlet of the heat recoverer, and a heat exchanger of the high-pressure absorber is connected with a heat supply medium inlet and a heat supply medium outlet; the concentrated solution outlet of the heat recoverer is connected with the solution inlet of the low-pressure absorber through a high-pressure throttle valve; a refrigerant steam inlet of the low-pressure absorber is connected with a refrigerant steam outlet of the flash evaporator, a solution outlet of the low-pressure absorber is connected with a solution inlet of the generator through a concentrated solution pump, and a heat exchanger of the low-pressure absorber is respectively connected with a cooling water inlet and a cooling water outlet of the low-pressure absorber; the solution outlet of the flash evaporator is connected with the dilute solution inlet of the heat recovery device through a dilute solution pump, the solution inlet of the flash evaporator is connected with the solution outlet of the generator through a low-pressure throttle valve, and the heat exchanger of the flash evaporator is connected with the waste heat medium inlet and the waste heat medium outlet of the flash evaporator.
2. A second type of absorption heat pump system based on generation liquid flash evaporation according to claim 1, wherein the working medium pair is ammonia-water, wherein ammonia is refrigerant and water is absorbent.
3. The second type absorption heat pump system based on generation liquid flash evaporation according to claim 1, wherein the working medium pair is water-lithium bromide, wherein water is a refrigerant, and lithium bromide is an absorbent.
4. The second-class absorption heat pump system based on generation liquid flash evaporation as claimed in claim 2, wherein when the system adopts ammonia-water as absorption working medium pair, the generator is provided with a rectification device for purifying ammonia.
5. The second-class absorption heat pump system based on liquid generation flash evaporation according to claim 1, wherein the heat recovery device is a plate heat exchanger or a shell-and-tube heat exchanger.
6. The operating method of a second type absorption heat pump system based on generation liquid flash evaporation as claimed in any one of claims 1 to 5, wherein the waste heat medium heats the working medium pair through a generator heat exchanger, wherein the refrigerant is evaporated and enters a condenser to release heat and liquefy, the refrigerant liquid enters an evaporator after being pressurized by the refrigerant pump, and then is heated by waste heat to become high-pressure refrigerant vapor, and the refrigerant vapor enters a high-pressure absorber; the solution of the generator is decompressed by a throttle valve and then enters a flash evaporator, the solution is heated by waste heat and then is gasified again under the low-pressure condition, the concentration of the solution is further reduced, the solution of the flash evaporator passes through a dilute solution pump and then enters a high-pressure absorber through a heat recoverer, and refrigerant steam from an evaporator is absorbed under the high-pressure condition; the high-temperature solution of the high-pressure absorber outputs high-temperature heat outwards through the high-pressure absorber heat exchanger; then the solution in the high-pressure absorber is decompressed by the high-pressure throttle valve after passing through the heat recoverer, enters the low-pressure absorber, absorbs low-pressure refrigerant steam from the flash evaporator, the released heat is absorbed by circulating water and then discharged to the environment, and the solution in the low-pressure absorber enters the generator after being pressurized by the concentrated solution pump and starts the next circulation.
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| CN202110907805.4A CN113686046A (en) | 2021-08-09 | 2021-08-09 | Second-class absorption heat pump system and method based on generation liquid flash evaporation |
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| US20100282436A1 (en) * | 2008-01-22 | 2010-11-11 | Beijing Lianliyuan Technology Co., Ltd. | Absorptive heat pump systems and heating method |
| CN103808060A (en) * | 2014-02-17 | 2014-05-21 | 双良节能系统股份有限公司 | Two-stage absorption second-kind lithium bromide absorption heat pump unit with flash evaporator |
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2021
- 2021-08-09 CN CN202110907805.4A patent/CN113686046A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100282436A1 (en) * | 2008-01-22 | 2010-11-11 | Beijing Lianliyuan Technology Co., Ltd. | Absorptive heat pump systems and heating method |
| CN101504217A (en) * | 2009-02-27 | 2009-08-12 | 李华玉 | Backheating type generation-absorption system and high-temperature second-kind absorption type heat pump |
| CN101504216A (en) * | 2009-02-28 | 2009-08-12 | 李华玉 | Composite absorption-generation system and high-efficiency absorption type units |
| CN101825369A (en) * | 2010-04-02 | 2010-09-08 | 清华大学 | High-efficiency compact high-temperature absorption type heat pump unit |
| CN103808060A (en) * | 2014-02-17 | 2014-05-21 | 双良节能系统股份有限公司 | Two-stage absorption second-kind lithium bromide absorption heat pump unit with flash evaporator |
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