CN114719319A - Lithium bromide-carbon dioxide combined heat supply unit - Google Patents

Lithium bromide-carbon dioxide combined heat supply unit Download PDF

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Publication number
CN114719319A
CN114719319A CN202210242178.1A CN202210242178A CN114719319A CN 114719319 A CN114719319 A CN 114719319A CN 202210242178 A CN202210242178 A CN 202210242178A CN 114719319 A CN114719319 A CN 114719319A
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CN
China
Prior art keywords
heat exchange
carbon dioxide
exchange tube
lithium bromide
generator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210242178.1A
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Chinese (zh)
Inventor
马杰
杨润
王健
苏强
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangsu Jintong Lingguang Nuclear Energy Technology Co ltd
Original Assignee
Jiangsu Jintong Lingguang Nuclear Energy Technology Co ltd
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Filing date
Publication date
Application filed by Jiangsu Jintong Lingguang Nuclear Energy Technology Co ltd filed Critical Jiangsu Jintong Lingguang Nuclear Energy Technology Co ltd
Priority to CN202210242178.1A priority Critical patent/CN114719319A/en
Publication of CN114719319A publication Critical patent/CN114719319A/en
Pending legal-status Critical Current

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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
    • 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
    • F24D19/00—Details
    • F24D19/10—Arrangement or mounting of control or safety devices
    • F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
    • F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
    • F24D19/1039—Arrangement or mounting of control or safety devices for water heating systems for central heating the system uses a heat pump
    • 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
    • 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
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/04—Arrangement or mounting of control or safety devices for sorption type machines, plants or systems
    • F25B49/043—Operating continuously
    • 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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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Materials Engineering (AREA)
  • Sorption Type Refrigeration Machines (AREA)

Abstract

The invention relates to the technical field of heat supply, in particular to a lithium bromide-carbon dioxide combined heat supply unit, which comprises: the carbon dioxide system comprises a compressor, an expansion valve and a first heat exchanger; the lithium bromide system comprises an evaporator with an evaporator heat exchange tube, an absorber with an absorber heat exchange tube, a generator with a generator heat exchange tube, a condenser with a condenser heat exchange tube and a vacuum pump in fluid communication with the evaporator, wherein a feeding pipe for allowing a lithium bromide solution to flow from the absorber to the generator and a return pipe for allowing the lithium bromide solution to flow from the generator to the absorber are arranged between the absorber and the generator; the water supply system comprises a water inlet valve and a water outlet valve, wherein the water inlet valve, the absorber heat exchange tube and the condenser heat exchange tube are sequentially in fluid communication and form a first water supply path for users to flow water; the compressor, the heat exchange tube of the generator, the heat exchange tube of the evaporator, the expansion valve and the first heat exchanger are sequentially in fluid communication to form a loop for circulating the carbon dioxide fluid.

Description

Lithium bromide-carbon dioxide combined heat supply unit
Technical Field
The invention relates to the technical field of heat supply, in particular to a lithium bromide-carbon dioxide combined heat supply unit.
Background
Carbon dioxide is used as a working medium of the heat pump to circulate in a transcritical state, and can generate temperature slippage in the cooler; meanwhile, the carbon dioxide supercritical fluid has the characteristics of large specific heat, high heat conductivity coefficient and small dynamic viscosity, so that the carbon dioxide transcritical circulation has very high energy efficiency coefficient when applied to a heat pump system. The lithium bromide solution is non-toxic and colorless and has strong hygroscopicity, and can be used as a carrier of water in the technical field of heat supply or refrigeration. And at present, a lithium bromide-carbon dioxide combined heat supply unit capable of conducting multi-stage heat transfer is not available.
Disclosure of Invention
In order to solve the above-mentioned problems, it is an object of the present invention to provide a lithium bromide-carbon dioxide combined heating unit capable of multi-stage heat transfer.
In order to achieve the above purpose, the invention provides the following technical scheme: a lithium bromide-carbon dioxide combined heat supply unit comprising: the carbon dioxide system comprises a compressor, an expansion valve and a first heat exchanger; the lithium bromide system comprises an evaporator with an evaporator heat exchange tube, an absorber with an absorber heat exchange tube, a generator with a generator heat exchange tube, a condenser with a condenser heat exchange tube and a vacuum pump in fluid communication with the evaporator, wherein the evaporator, the absorber, the generator and the condenser are sequentially in fluid communication and form a loop for circulating water, and a feed pipe for allowing a lithium bromide solution to flow from the absorber to the generator and a return pipe for allowing the lithium bromide solution to flow from the generator to the absorber are arranged between the absorber and the generator; the water inlet valve, the absorber heat exchange tube and the condenser heat exchange tube are sequentially communicated in a fluid manner to form a first water supply path for the user to flow; the compressor, the heat exchange tube of the generator, the heat exchange tube of the evaporator, the expansion valve and the first heat exchanger are sequentially communicated with each other in a fluid manner to form a loop for circulating the carbon dioxide fluid.
In the above technical solution, preferably, the carbon dioxide system further includes a cooler located between the heat exchange tube of the generator and the heat exchange tube of the evaporator, the water inlet valve, the cooler and the water outlet valve are sequentially in fluid communication and form a second water supply path for users to flow, and the cooler can exchange heat between the carbon dioxide fluid and the water used by the users. It is further preferable that the water inlet valve and the water outlet valve are three-way valves.
In the above technical solution, preferably, the lithium bromide system further includes a second heat exchanger located between the absorber and the generator, and the second heat exchanger can be used for heat exchange between the feeding pipe and the lithium bromide solution in the return pipe.
In the above technical solution, preferably, the first heat exchanger is a fin heat exchanger.
In the above technical solution, preferably, the carbon dioxide system is further provided with a defrost valve, and the evaporator heat exchange tube, the defrost valve and the first heat exchanger are sequentially in fluid communication.
In the above technical solution, preferably, the feeding pipe is provided with a solution pump.
Compared with the prior art, the carbon dioxide fluid in the lithium bromide-carbon dioxide combined heat supply unit provided by the invention releases heat to the outside through the heat exchange tube of the generator and the heat exchange tube of the evaporator, and the user absorbs the heat through the heat exchange tube of the absorber and the heat exchange tube of the condenser, so that the multi-stage heat exchange is realized, the temperature difference of each stage of heat exchange is reduced, and the heat energy conversion efficiency is improved.
Drawings
Fig. 1 is a schematic diagram of a lithium bromide-carbon dioxide combined heat supply unit provided by the invention.
The labels in the figure are:
100. a lithium bromide-carbon dioxide combined heat supply unit;
11. a compressor; 12. a cooler; 13. an expansion valve; 14. a first heat exchanger; 15. a defrost valve;
21. an evaporator; 211. an evaporator heat exchange tube; 22. an absorber; 221. an absorber heat exchange tube; 23. a generator; 231. a generator heat exchange tube; 24. a condenser; 241. a condenser heat exchange tube; 25. a vacuum pump; 26. a solution pump; 27. a second heat exchanger.
Detailed Description
To explain technical contents, structural features, achieved objects and effects of the invention in detail, the technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a detailed description of various exemplary embodiments or implementations of the invention. However, various exemplary embodiments may be practiced without these specific details or with one or more equivalent arrangements. Moreover, the various exemplary embodiments may be different, but are not necessarily exclusive. For example, the particular shapes, configurations and characteristics of the exemplary embodiments may be used or implemented in another exemplary embodiment without departing from the inventive concept.
Further, spatially relative terms such as "below … …," "below … …," "below … …," "below," "above … …," "above," "… …," "higher," "side" (e.g., as in "side wall"), and the like, in this application, thus describe one element's relationship to another (other) element as illustrated in the figures. Spatially relative terms are intended to encompass different orientations of the device in use, operation, and/or manufacture in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below … …" can encompass both an orientation of above and below. Further, the devices may be otherwise positioned (e.g., rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
In the present application, unless expressly stated or limited otherwise, the term "coupled" is to be construed broadly, e.g., "coupled" may be a fixed connection, a removable connection, or an integral part; may be directly connected or indirectly connected through an intermediate.
Fig. 1 shows a lithium bromide-carbon dioxide combined heat supply unit 100 (hereinafter referred to as a heat supply unit 100) provided by the invention, and the heat supply unit 100 can heat water for users by using multi-stage heat transfer, so that the temperature difference of each stage of heat transfer is reduced, and the heat utilization rate is improved. The heating unit 100 includes a carbon dioxide system, a lithium bromide system, and a water supply system.
The carbon dioxide loop comprises a compressor 11, a cooler 12, an expansion valve 13 and a first heat exchanger 14, wherein the compressor 11, a generator heat exchange tube 231 (see below), the cooler 12, an evaporator heat exchange tube 211 (see below), the expansion valve 13 and the first heat exchanger 14 are sequentially in fluid communication and form a loop for circulating carbon dioxide fluid. The first heat exchanger 14 is a finned heat exchanger and is adapted to exchange heat between the carbon dioxide fluid and air.
When the heating unit 100 operates, the compressor 11 pressurizes and pushes the carbon dioxide fluid forward, and thereafter, the carbon dioxide fluid externally emits heat and decreases in temperature at the generator heat exchange pipe 231, the cooler 12, and the evaporator heat exchange pipe 211 in sequence. Then, the carbon dioxide fluid is expanded and cooled by the expansion valve 13, reaches the first heat exchanger 14 to absorb heat, and the temperature of the carbon dioxide fluid rises, and the carbon dioxide fluid flowing out of the first heat exchanger 14 reaches the inlet of the compressor 11, so that a cycle is completed.
The carbon dioxide circuit is further arranged with a defrost valve 15 bypassing the expansion valve 13, the evaporator heat exchange tubes 211, the defrost valve 15 and the first heat exchanger 14 being in turn in fluid communication. When the defrost valve 15 is opened, the carbon dioxide fluid at the inlet of the expansion valve 15 can reach the first heat exchanger 14 from the defrost valve 15 without diffusion cooling to eliminate the frost formation of the first heat exchanger 14.
The lithium bromide system comprises an evaporator 21 with an evaporating heat exchange tube 211, an absorber 22 with an absorbing heat exchange tube 221, a generator 23 with a generating heat exchange tube 231, and a condenser 24 with a condensing heat exchange tube 241. The evaporator 21, the absorber 22, the generator 23 and the condenser 24 are in turn in fluid communication and constitute a circuit for the circulation of the water.
The lithium bromide system further comprises a vacuum pump 25 in fluid communication with the evaporator 21, and a solution pump 26 and a second heat exchanger 27 arranged between the absorber 22 and the generator 23. A feeding pipe (not shown in the figure) for lithium bromide solution to flow from the absorber 22 to the generator 23 and a return pipe (not shown in the figure) for lithium bromide solution to flow from the generator 23 to the absorber 22 are arranged between the absorber 22 and the generator 23, and a solution pump 26 is arranged on the feeding pipe and provides flowing power for the lithium bromide solution. The feeding pipe and the feed back pipe are both communicated with the second heat exchanger 27, and the second heat exchanger 27 can be used for heat exchange between the feeding pipe and the lithium bromide solution in the feed back pipe.
When the heating unit 100 is operated, the vacuum pump 25 is started to lower the air pressure in the evaporator 21 and the evaporation temperature of the internal water. The water in the evaporator 21 absorbs the heat released by the carbon dioxide fluid at the heat exchange tube 211 of the evaporator and then is gasified into water vapor, and the water vapor enters the absorber 22 and is absorbed by the concentrated lithium bromide solution in the absorber and gives out heat to the heat exchange tube 221 of the absorber. The concentrated lithium bromide solution in the absorber 22 is diluted and passed through a solution pump 26 to the generator 23.
The dilute lithium bromide solution in the generator 23 absorbs the heat generated by the carbon dioxide fluid at the heat exchange tube 231 of the generator, the water in the dilute lithium bromide solution is gasified into water vapor to be separated out, and the concentration of the lithium bromide solution is increased and returns to the absorber 22 through the return tube. The water vapor in the generator 23 flows into the condenser 24, and is condensed into water while giving off heat to the condenser heat exchange tubes 241. The water from the condenser 24 flows into the evaporator 21 to complete a cycle.
The water supply path includes a water inlet valve 31 and a water outlet valve 32 located at the head and the tail ends, and the water inlet valve 31 and the water outlet valve 32 are three-way valves and are respectively used for users to flow in and flow out. The water inlet valve 31, the absorber heat exchange tube 221, the condenser heat exchange tube 241 and the water outlet valve 32 are sequentially in fluid communication and form a first water supply path for the user to flow, and on the first water supply path, the user uses water to absorb heat and raise the temperature in the absorber heat exchange tube 221 and the condenser heat exchange tube 241 in sequence. The inlet valve 31, cooler 12 and outlet valve 32 are in turn in fluid communication and form a second water supply path that shares the flow of user water, where the user water absorbs heat at the cooler 12 and rises in temperature. Thus, the heating unit 100 transfers heat of the carbon dioxide fluid to the user water by using multi-stage heat transfer, thereby heating the user water.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the foregoing description only for the purpose of illustrating the principles of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims, specification, and equivalents thereof.

Claims (7)

1. A lithium bromide-carbon dioxide combined heat supply unit is characterized by comprising:
a carbon dioxide system comprising a compressor (11), an expansion valve (13) and a first heat exchanger (14);
a lithium bromide system, comprising an evaporator (21) with an evaporator heat exchange tube (211), an absorber (22) with an absorber heat exchange tube (221), a generator (23) with a generator heat exchange tube (231), a condenser (24) with a condenser heat exchange tube (241), and a vacuum pump (25) in fluid communication with the evaporator (21), wherein the evaporator (21), the absorber (22), the generator (23), and the condenser (24) are in fluid communication in sequence and form a loop for circulating a water supply, and a feed pipe for lithium bromide solution flowing from the absorber (22) to the generator (23) and a return pipe for lithium bromide solution flowing from the generator (23) to the absorber (22) are arranged between the absorber (22) and the generator (23);
the water supply system comprises a water inlet valve (31) for allowing water of a user to flow in and a water outlet valve (32) for allowing the water of the user to flow out, wherein the water inlet valve (31), the absorber heat exchange tube (221) and the condenser heat exchange tube (231) are sequentially communicated in a fluid manner to form a first water supply path for allowing the water of the user to flow;
wherein, the compressor (11), the heat exchange tube (231) of the generator, the heat exchange tube (211) of the evaporator, the expansion valve (13) and the first heat exchanger (14) are sequentially communicated in fluid and form a loop for circulating and flowing carbon dioxide fluid.
2. A lithium bromide-carbon dioxide cogeneration unit according to claim 1, wherein said carbon dioxide system further comprises a cooler (12) positioned between said generator heat exchange tube (231) and said evaporator heat exchange tube (211), said inlet valve (31), said cooler (12) and said outlet valve (32) being in fluid communication in sequence and defining a second water supply path for user water flow, said cooler (12) being capable of heat exchange of carbon dioxide fluid with user water.
3. A lithium bromide-carbon dioxide combined heating unit according to claim 2, characterized in that the water inlet valve (31) and the water outlet valve (32) are three-way valves.
4. A lithium bromide-carbon dioxide combined heat supply unit according to claim 1, wherein the lithium bromide system further comprises a second heat exchanger (27) between the absorber (22) and the generator (23), and the second heat exchanger (27) is capable of exchanging heat between the feeding pipe and the lithium bromide solution in the feed back pipe.
5. A lithium bromide-carbon dioxide combined heating unit according to claim 1, wherein the first heat exchanger (14) is a finned heat exchanger.
6. A lithium bromide-carbon dioxide combined heat supply unit according to claim 1, wherein the carbon dioxide system is further provided with a defrost valve (15), and the evaporator heat exchange tube (211), the defrost valve (15) and the first heat exchanger (14) are in fluid communication in sequence.
7. A lithium bromide-carbon dioxide combined heat supply unit according to claim 1, characterized in that the feed pipe is provided with a solution pump (26).
CN202210242178.1A 2022-03-11 2022-03-11 Lithium bromide-carbon dioxide combined heat supply unit Pending CN114719319A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210242178.1A CN114719319A (en) 2022-03-11 2022-03-11 Lithium bromide-carbon dioxide combined heat supply unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210242178.1A CN114719319A (en) 2022-03-11 2022-03-11 Lithium bromide-carbon dioxide combined heat supply unit

Publications (1)

Publication Number Publication Date
CN114719319A true CN114719319A (en) 2022-07-08

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Family Applications (1)

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CN202210242178.1A Pending CN114719319A (en) 2022-03-11 2022-03-11 Lithium bromide-carbon dioxide combined heat supply unit

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114135916A (en) * 2021-12-23 2022-03-04 北京华誉能源技术股份有限公司 Containing CO2Heating system of compression heat pump

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114135916A (en) * 2021-12-23 2022-03-04 北京华誉能源技术股份有限公司 Containing CO2Heating system of compression heat pump

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