CN215001823U - Geothermal energy step heating system based on double-stage absorption heat pump - Google Patents
Geothermal energy step heating system based on double-stage absorption heat pump Download PDFInfo
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- CN215001823U CN215001823U CN202120484698.4U CN202120484698U CN215001823U CN 215001823 U CN215001823 U CN 215001823U CN 202120484698 U CN202120484698 U CN 202120484698U CN 215001823 U CN215001823 U CN 215001823U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/40—Geothermal heat-pumps
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
Abstract
The utility model discloses a geothermal energy step heating system based on doublestage absorption heat pump, including doublestage absorption heat pump and water-water heat exchanger, doublestage absorption heat pump comprises low pressure absorber, low pressure solution pump, low pressure solution heat exchanger, low pressure generator, low pressure choke valve, high pressure absorber, high pressure solution pump, high pressure solution heat exchanger, high pressure generator, high pressure choke valve, condenser, refrigerant choke valve and the evaporimeter that connects gradually and form the return circuit through the pipeline. The utility model discloses heating system adopts the mode of outer water receiving-water heat exchanger and doublestage absorption heat pump common operation, has reduced heating system's drive heat source temperature, has improved heating system's application range, and the while is to the step utilization of high temperature geothermal water, has effectively reduced geothermal water recharge temperature, has improved the difference in temperature of geothermal water intaking with recharging by a wide margin to a great extent has reduced heat supply pipe network initial investment and pipeline transmission and distribution energy consumption, has reduced the operation cost of heat supply.
Description
Technical Field
The utility model relates to a heat supply technical field especially relates to a geothermal energy step heating system based on doublestage absorption heat pump.
Background
With the technical progress and the use of new materials and new equipment, the temperature of the ground radiation heating system adopting hot water is reduced to 40 ℃, so that the heating of northern towns in China can be realized by utilizing low-grade heat energy existing in industrial production and renewable energy sources (solar energy, geothermal energy and the like) in large quantity. If these medium or low grade heat sources can be used or reused, not only the energy efficiency of the whole system can be improved, but also the environmental pollution can be reduced. However, geothermal energy heating is taken as an example, and in traditional geothermal heating, a plate heat exchanger is adopted for heat exchange between geothermal water and heating medium circulating water. In the plate heat exchanger, in order to realize the heat exchange and ensure certain heat exchange efficiency, a large heat transfer temperature difference must be reserved between cold and hot fluids, and a large irreversible loss exists in the large temperature difference heat exchange process, so that a large amount of available energy is wasted.
SUMMERY OF THE UTILITY MODEL
To the deficiency among the prior art, the utility model provides a geothermal energy step heating system based on doublestage absorption heat pump, it uses NH3(Ammonia)/LiNO3The lithium nitrate is used as a working medium of the double-stage absorption heat pump, the double-stage absorption heat pump and the water-water heat exchanger are combined, the temperature of water supplied by a user side is increased, the outlet temperature of a high-temperature hot water pipeline is reduced, hot water at 40-50 ℃ on the user side can be provided when the temperature of the high-temperature hot water is 80-95 ℃, the outlet temperature of the high-temperature hot water is lower than 35 ℃, and the high-temperature hot water has high COP and large heating capacity.
NH3/LiNO3Has good thermophysical properties, and H2NH/LiBr heat pump system3/LiNO3The heat pump system has the advantages of no need of vacuum and no crystallization; and NH3/H2Compared with O heat pump system, LiNO3In liquid NH3The ion exists in the form of ions, the volatility is avoided, and the system does not need to be provided with rectification equipment. Furthermore, the results of the theoretical analysis show that two-stage NH3/LiNO3The performance of the absorption heat pump system is superior to that of the conventional NH3/H2And (4) an O system.
In order to achieve the above purpose, the technical scheme of the utility model is as follows:
a geothermal energy cascade heating system based on a double-stage absorption heat pump comprises a low-pressure absorber, a low-pressure generator, a high-pressure absorber, a high-pressure generator, a condenser, an evaporator and a water-water heat exchanger, wherein,
geothermal water flows: high-temperature geothermal water from the water taking well sequentially enters the high-pressure generator, the low-pressure generator, the water-water heat exchanger and the evaporator and then flows back to the recharging well, so that the recharging temperature of the geothermal water is reduced, and the temperature difference between the water taking of the geothermal water and the recharging is increased;
the user hot water flows and is divided into two paths: one path of the mixed water enters the low-pressure absorber, the high-pressure absorber and the condenser in sequence, the other path of the mixed water enters the water-water heat exchanger, and the two paths of the mixed water enter a user hot water supply pipeline so as to improve the water supply temperature of user hot water;
in the water-water heat exchanger, the user hot water flow exchanges heat with the user hot water flow.
The geothermal energy stepped heating system based on the double-stage absorption heat pump further comprises a low-pressure solution pump, a low-pressure solution heat exchanger, a low-pressure throttle valve, a high-pressure solution pump, a high-pressure solution heat exchanger, a high-pressure throttle valve, a refrigerant throttle valve and a hot water pump, wherein,
the first port of the low-pressure absorber is connected with the fourth port of the evaporator, the fourth port of the low-pressure absorber is connected with the first port of the low-pressure solution pump, the fifth port of the low-pressure absorber is connected with the second port of the low-pressure throttle valve, the second port of the low-pressure solution pump is connected with the first port of the low-pressure solution heat exchanger, the second port of the low-pressure solution heat exchanger is connected with the first port of the low-pressure generator, the third port of the low-pressure solution heat exchanger is connected with the fifth port of the low-pressure generator, the fourth port of the low-pressure solution heat exchanger is connected with the first port of the low-pressure throttle valve, the fourth port of the low-pressure generator is connected with the first port of the high-pressure absorber, the second port of the high-pressure absorber is connected with the first port of the high-pressure solution pump, the third port of the high-pressure absorber is connected with the second port of the high-pressure throttle valve, and the second port of the high-pressure solution pump is connected with the first port of the high-pressure solution heat exchanger, the second port of the high-pressure solution heat exchanger is connected with the first port of the high-pressure generator, the third port of the high-pressure solution heat exchanger is connected with the fifth port of the high-pressure generator, the fourth port of the high-pressure solution heat exchanger is connected with the first port of the high-pressure throttling valve, the fourth port of the high-pressure generator is connected with the first port of the condenser, the third port of the condenser is connected with the first port of the refrigerant throttling valve, and the second port of the refrigerant throttling valve is connected with the first port of the evaporator.
According to the geothermal energy cascade heating system based on the two-stage absorption heat pump, further, high-temperature hot water enters the first port of the hot water pump, the second port of the hot water pump is connected with the third port of the high-pressure generator, the second port of the high-pressure generator is connected with the third port of the low-pressure generator, the second port of the low-pressure generator is connected with the first port of the water-water heat exchanger, the fourth port of the water-water heat exchanger is connected with the third port of the evaporator, and the second port of the evaporator is connected with the recharge well pipeline; one path of user hot water backwater enters a third port of the low-pressure absorber, a second port of the low-pressure absorber is connected with a fifth port of the high-pressure absorber, a fourth port of the high-pressure absorber is connected with a second port of the condenser, one path of user hot water backwater enters a third port of the water-water heat exchanger, and the fourth port of the condenser and the second port of the water-water heat exchanger are connected with a user hot water supply pipeline.
In the geothermal energy cascade heating system based on the double-stage absorption heat pump, the low-pressure absorber and the evaporator operate at a first pressure stage; the low-pressure solution heat exchanger, the low-pressure generator and the high-pressure absorber operate at a second pressure stage; the high pressure solution heat exchanger, the high pressure generator and the condenser are operated at a third pressure stage, wherein the pressure of the first, second and third pressure stages is gradually increased. Specifically, the dual-stage absorption heat pump system operates at three pressures, with the low pressure absorber and evaporator operating at the low pressure stage; the low pressure solution heat exchanger, the low pressure generator and the high pressure absorber operate at a medium pressure stage; the high pressure solution heat exchanger, high pressure generator and condenser operate at a high pressure stage.
According to the geothermal energy cascade heating system based on the two-stage absorption heat pump, furthermore, the high-temperature geothermal water from the geothermal water taking well sequentially enters the high-pressure generator, the low-pressure generator, the water-water heat exchanger and the evaporator through the hot water pump for heat exchange, so that the recharging temperature of the geothermal water is reduced, the temperature difference between the geothermal water taking well and the recharging well is increased, and the geothermal energy cascade utilization is realized; the return water temperature of hot water of the user is increased through the water-water heat exchanger, the supply water temperature of the hot water of the user is increased, and the difference between the return water temperature and the supply water temperature of the hot water of the user is increased.
The geothermal energy cascade heating system based on the double-stage absorption heat pump further adopts NH3Is a refrigerant, NH3/LiNO3The solution is an absorbent.
Compared with the prior art, the utility model, its beneficial effect lies in:
(1) an external water-water heat exchanger is added, high-temperature geothermal water can directly enter an evaporator after being cooled step by step through a high-pressure generator, a low-pressure generator and the water-water heat exchanger, the evaporator does not need to be externally connected with other heat sources, and the reliability of a heat pump system is improved;
(2) under the condition of meeting the hot water heating temperature of a user, the temperature of the high-temperature geothermal water driven by the system requirement is further reduced, and meanwhile, the temperature of the geothermal water recharging is also reduced, so that the application range of the double-stage absorption heat pump heating system is expanded, the geothermal energy is more fully utilized, and the cascade utilization of the geothermal energy is realized;
(3) two-stage NH3/LiNO3The absorption heat pump system belongs to a positive pressure system, does not need vacuum, and has NH3/LiNO3Solution is not suitable for crystallization, LiNO3The heat pump system has no volatility, a rectification device is not needed in the heat pump system, and the performance coefficient of the heat pump system is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of a geothermal energy cascade heating system based on a double-stage absorption heat pump.
Description of reference numerals: 1. a low pressure absorber; 2. a low-pressure solution pump; 3. a low pressure solution heat exchanger; 4. a low voltage generator; 5. a low pressure throttle valve; 6. a high pressure absorber; 7. a high-pressure solution pump; 8. a high pressure solution heat exchanger; 9. a high voltage generator; 10. a high pressure throttle valve; 11. a condenser; 12. a refrigerant throttle valve; 13. an evaporator; 14. a water-water heat exchanger; 15. a hot water pump.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Example (b):
it should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, of embodiments of the present invention are intended to cover non-exclusive inclusions, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise. Furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, fig. 1 is a schematic diagram of a geothermal energy stepped heating system based on a double-stage absorption heat pump.
An object of the utility model is to provide a geothermal energy step heating system based on doublestage absorption heat pump, it uses NH3(Ammonia)/LiNO3(lithium nitrate) is used as a working medium of the two-stage absorption heat pump, and the two-stage absorption heat pump and the water-water heat exchanger are combinedFormula has improved the temperature that the user side supplied water, has reduced the exit temperature of high temperature hot water pipeline simultaneously, can be when high temperature hot water temperature is 80 ~ 95 ℃, provides the hot water of user side 40 ~ 50 ℃, and high temperature hot water exit temperature is less than 35 ℃, has higher COP and great heating capacity.
It should be noted that the absorption heat pump is a circulation system that is directly driven by heat energy and uses a low-grade heat source to transfer heat from a low-temperature heat source to a high-temperature heat source, and is an effective device for recycling low-grade heat energy, and has dual functions of saving energy and protecting the environment. In recent years, the absorption heat pump technology has been widely popularized and applied, and low-grade heat energy including renewable energy sources is recovered by the absorption heat pump for heat supply, so that better energy-saving benefits can be brought. The hot water type double-stage absorption heat pump with the two generators and the two absorbers can utilize a low-grade heat source at 70-90 ℃ as a driving heat source, and hot water with higher temperature can be output at the outlet of the condenser. The absorption heat pump system using ammonia-lithium nitrate as the working medium pair has the unique advantages of renewable energy utilization, no need of vacuum, no crystallization and the like compared with the traditional water-lithium bromide absorption heat pump. In addition, because lithium nitrate exists in the liquid ammonia solution in the form of ions and is nonvolatile, compared with an ammonia-water absorption heat pump, the ammonia-lithium nitrate system does not need a rectification device, the system composition is greatly simplified, the system cost is reduced, and the reliability of the system operation is improved.
In one embodiment, the geothermal energy stepped heating system based on the double-stage absorption heat pump comprises a low-pressure absorber 1, a low-pressure solution pump 2, a low-pressure solution heat exchanger 3, a low-pressure generator 4, a low-pressure throttle valve 5, a high-pressure absorber 6, a high-pressure solution pump 7, a high-pressure solution heat exchanger 8, a high-pressure generator 9, a high-pressure throttle valve 10, a condenser 11, a refrigerant throttle valve 12, an evaporator 13, a water-water heat exchanger 14 and a hot water pump 15; the first port 1a of the low pressure absorber 1 is connected to the fourth port 13d of the evaporator 13, the fourth port 1d of the low pressure absorber 1 is connected to the first port 2a of the low pressure solution pump 2, the fifth port 1e of the low pressure absorber 1 is connected to the second port 5b of the low pressure throttle valve 5, the second port 2b of the low pressure solution pump 2 is connected to the first port 3a of the low pressure solution heat exchanger 3, the second port 3b of the low pressure solution heat exchanger 3 is connected to the first port 4a of the low pressure generator 4, the third port 3c of the low pressure solution heat exchanger 3 is connected to the fifth port 4e of the low pressure generator 4, the fourth port 3d of the low pressure solution heat exchanger 3 is connected to the first port 5a of the low pressure throttle valve 5, the fourth port 4d of the low pressure generator 4 is connected to the first port 6a of the high pressure absorber 6, the second port 6b of the high pressure absorber 6 is connected to the first port 7a of the high pressure solution pump 7, the third port 6c of the high-pressure absorber 6 is connected to the second port 10b of the high-pressure throttle valve 10, the second port 7b of the high-pressure solution pump 7 is connected to the first port 8a of the high-pressure solution heat exchanger 8, the second port 8b of the high-pressure solution heat exchanger 8 is connected to the first port 9a of the high-pressure generator 9, the third port 8c of the high-pressure solution heat exchanger 8 is connected to the fifth port 9e of the high-pressure generator 9, the fourth port 8d of the high-pressure solution heat exchanger 8 is connected to the first port 10a of the high-pressure throttle valve 10, the fourth port 9d of the high-pressure generator 9 is connected to the first port 11a of the condenser 11, the third port 11c of the condenser 11 is connected to the first port 12a of the refrigerant throttle valve 12, and the second port 12b of the refrigerant throttle valve 12 is connected to the first port 13a of the evaporator 13.
The high-temperature geothermal water from the water taking well sequentially enters the high-pressure generator 9, the low-pressure generator 4, the water-water heat exchanger 14 and the evaporator 13 through the hot water pump 15 and then flows back to the recharging well pipeline; the user hot water backwater is divided into two paths, one path of the user hot water backwater sequentially enters the low-pressure absorber 1, the high-pressure absorber 6 and the condenser 11, the other path of the user hot water backwater enters the water-water heat exchanger 14, and the two paths of the user hot water backwater are mixed and then enter the user hot water for water supply; high-temperature geothermal water enters a first port 15a of a hot water pump 15, a second port 15b of the hot water pump 15 is connected with a third port 9c of a high-pressure generator 9, a second port 9b of the high-pressure generator 9 is connected with a third port 4c of a low-pressure generator 4, a second port 4b of the low-pressure generator 4 is connected with a first port 14a of a water-water heat exchanger 14, a fourth port 14d of the water-water heat exchanger 14 is connected with a third port 13c of an evaporator 13, and a second port 13b of the evaporator 13 is connected with a high-temperature hot water outlet; one path of user hot water backwater enters a third port 1c of the low-pressure absorber 1, a second port 1b of the low-pressure absorber 1 is connected with a fifth port 6e of the high-pressure absorber 6, a fourth port 6d of the high-pressure absorber 6 is connected with a second port 11b of the condenser 11, one path of user hot water backwater enters a third port 14c of the water-water heat exchanger 14, and a fourth port 11d of the condenser 11 and a second port 14b of the water-water heat exchanger 14 are connected with a user hot water supply pipeline.
The low-pressure absorber 1, the low-pressure generator 4, the high-pressure absorber 6, the high-pressure generator 9, the condenser 11 and the evaporator 13 are all heat exchangers in the forms of immersion, sleeve pipe, spray or other forms, wherein the heat exchange pipes comprise two forms of common pipes and reinforced pipes; the low-pressure solution heat exchanger 3, the high-pressure solution heat exchanger 8 and the water-water heat exchanger 14 are all plate heat exchangers.
The low-pressure absorber 1 is used for absorbing low-pressure NH generated by the evaporator3Steam, the heat released, is absorbed by the user hot water circuit.
The low pressure generator 4 is used for absorbing heat of high temperature hot water and generating medium pressure NH3And (4) steam.
The high-pressure absorber 6 is used for absorbing the medium-pressure NH generated by the low-pressure generator3Steam, the heat released, is absorbed by the user hot water circuit.
The high pressure generator 9 is used for absorbing heat of high temperature hot water and generating high pressure NH3And (4) steam.
The low-pressure solution pump 2 and the high-pressure solution pump 7 are both magnetic pumps.
The hot water pump 15 is a centrifugal pump.
The above-mentioned connections between each part adopt the metal pipeline to connect.
As an alternative embodiment, in some embodiments, the heat pump system employs NH3Is a refrigerant, NH3/LiNO3Is absorbent.
NH3/LiNO3The concentrated solution absorbs the low-pressure NH evaporated from the evaporator 13 in the low-pressure absorber 13Steam to form NH3/LiNO3The dilute solution is pressurized by a low-pressure solution pump 2 and enters the low-pressure solution heat exchanger 3 after being heatedA low pressure generator 4 in which medium pressure NH is generated driven by hot water at high temperature3Steam and NH3/LiNO3Concentrated solution, separated, medium pressure NH3The vapor enters the high-pressure absorber 6 upwards to be absorbed, NH3/LiNO3The concentrated solution returns to the low-pressure absorber 1 after being cooled by the low-pressure solution heat exchanger 3 and depressurized by the low-pressure throttle valve 5, and the other NH is3/LiNO3The concentrated solution absorbs the medium-pressure NH from the low-pressure generator 4 in a high-pressure absorber 63Steam to form NH3/LiNO3The dilute solution is pressurized by a high-pressure solution pump 7, heated by a high-pressure solution heat exchanger 8, and then enters a high-pressure generator 9, where high-pressure NH is generated by being driven by high-temperature hot water3Steam and NH3/LiNO3Concentrated solution, separated, high pressure NH3The steam enters a condenser 11, NH3/LiNO3The concentrated solution is cooled by a high-pressure solution heat exchanger 8 and depressurized by a high-pressure throttle valve 10, and then returns to a high-pressure absorber 6, and high-pressure NH is added into a condenser 113Vapor condensation exothermic to high pressure NH3The liquid, reduced in pressure by the refrigerant throttle 12, returns to the evaporator 13, forming a refrigerant cycle.
High-temperature geothermal water from a water taking well passes through a hot water pump 15, and flows out of a heat supply system after being subjected to gradual heat release and temperature reduction through a high-pressure generator 9, a low-pressure generator 4, a water-water heat exchanger 14 and an evaporator 13 in sequence; the user hot water backwater is divided into two paths, one path of the backwater is heated by absorbing heat through the low-pressure absorber 1, the high-pressure absorber 6 and the condenser 11 in sequence, the other path of the backwater is heated by absorbing heat through the water-water heat exchanger 14, and the two paths of the backwater are mixed and then flow out of the heating system.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.
Claims (5)
1. A geothermal energy cascade heating system based on a two-stage absorption heat pump is characterized by comprising a low-pressure absorber, a high-pressure absorber, a low-pressure generator, a high-pressure generator, a condenser, an evaporator and a water-water heat exchanger, wherein,
geothermal water flows: high-temperature geothermal water from the water taking well sequentially enters the high-pressure generator, the low-pressure generator, the water-water heat exchanger and the evaporator and then flows back to the recharging well;
the user hot water flows and is divided into two paths: one path of the mixed gas enters the low-pressure absorber, the high-pressure absorber and the condenser in sequence, the other path of the mixed gas enters the water-water heat exchanger, and the two paths of the mixed gas enter a user hot water supply pipeline;
in the water-water heat exchanger, the user hot water flow exchanges heat with the user hot water flow.
2. The geothermal energy stepped heating system based on the two-stage absorption heat pump according to claim 1, further comprising a low-pressure solution pump, a low-pressure solution heat exchanger, a low-pressure throttle valve, a high-pressure solution pump, a high-pressure solution heat exchanger, a high-pressure throttle valve, a refrigerant throttle valve, and a hot water pump, wherein,
the first port of the low-pressure absorber is connected with the fourth port of the evaporator, the fourth port of the low-pressure absorber is connected with the first port of the low-pressure solution pump, the fifth port of the low-pressure absorber is connected with the second port of the low-pressure throttle valve, the second port of the low-pressure solution pump is connected with the first port of the low-pressure solution heat exchanger, the second port of the low-pressure solution heat exchanger is connected with the first port of the low-pressure generator, the third port of the low-pressure solution heat exchanger is connected with the fifth port of the low-pressure generator, the fourth port of the low-pressure solution heat exchanger is connected with the first port of the low-pressure throttle valve, the fourth port of the low-pressure generator is connected with the first port of the high-pressure absorber, the second port of the high-pressure absorber is connected with the first port of the high-pressure solution pump, the third port of the high-pressure absorber is connected with the second port of the high-pressure throttle valve, and the second port of the high-pressure solution pump is connected with the first port of the high-pressure solution heat exchanger, the second port of the high-pressure solution heat exchanger is connected with the first port of the high-pressure generator, the third port of the high-pressure solution heat exchanger is connected with the fifth port of the high-pressure generator, the fourth port of the high-pressure solution heat exchanger is connected with the first port of the high-pressure throttling valve, the fourth port of the high-pressure generator is connected with the first port of the condenser, the third port of the condenser is connected with the first port of the refrigerant throttling valve, and the second port of the refrigerant throttling valve is connected with the first port of the evaporator.
3. The geothermal energy stepped heating system based on the two-stage absorption heat pump according to claim 1, wherein high-temperature hot water enters the first port of the hot water pump, the second port of the hot water pump is connected with the third port of the high-pressure generator, the second port of the high-pressure generator is connected with the third port of the low-pressure generator, the second port of the low-pressure generator is connected with the first port of the water-water heat exchanger, the fourth port of the water-water heat exchanger is connected with the third port of the evaporator, and the second port of the evaporator is connected with the recharge well pipeline; one path of user hot water backwater enters a third port of the low-pressure absorber, a second port of the low-pressure absorber is connected with a fifth port of the high-pressure absorber, a fourth port of the high-pressure absorber is connected with a second port of the condenser, one path of user hot water backwater enters a third port of the water-water heat exchanger, and the fourth port of the condenser and the second port of the water-water heat exchanger are connected with a user hot water supply pipeline.
4. The dual-stage absorption heat pump-based geothermal energy step heating system of claim 1, wherein the low pressure absorber and the evaporator operate at a first pressure stage; the low-pressure solution heat exchanger, the low-pressure generator and the high-pressure absorber operate at a second pressure stage; the high pressure solution heat exchanger, the high pressure generator and the condenser are operated at a third pressure stage, wherein the pressure of the first, second and third pressure stages is gradually increased.
5. The two-stage absorption heat pump-based geothermal energy step heating system according to claim 1, wherein NH is adopted3Is a refrigerant, NH3/LiNO3The solution is an absorbent.
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