CN115111802B - Coupled compression and absorption type high-temperature heat pump system and method thereof - Google Patents
Coupled compression and absorption type high-temperature heat pump system and method thereof Download PDFInfo
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- CN115111802B CN115111802B CN202210778390.XA CN202210778390A CN115111802B CN 115111802 B CN115111802 B CN 115111802B CN 202210778390 A CN202210778390 A CN 202210778390A CN 115111802 B CN115111802 B CN 115111802B
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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
- F25B25/00—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00
- F25B25/02—Compression-sorption machines, plants, or systems
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
- F25B41/24—Arrangement of shut-off valves for disconnecting a part of the refrigerant cycle, e.g. an outdoor part
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
- F25B41/34—Expansion valves with the valve member being actuated by electric means, e.g. by piezoelectric actuators
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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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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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
- 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
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
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Abstract
本发明一种耦合压缩与吸收式高温热泵系统，该系统包括以下装置：第一储水罐、低温压缩机、高温压缩机、发冷凝器、第一冷凝器、第二蒸发器、吸收器、发生器、第一换热器、第二换热器和第三储水罐；所述第一储水罐、低温压缩机、高温压缩机、发冷凝器、第一冷凝器、第二蒸发器、吸收器、发生器、第一换热器、第二换热器和第三储水罐之间通过连接管路进行连接；该系统包括压缩式热泵系统和吸收式热泵系统；压缩式热泵系统包括低温级循环系统和高温级循环系统。本发明通过将压缩式热泵系统分为低温级循环系统和高温级循环系统，并结合吸收式热泵系统，根据液体温度的需求，自由调控路径选择，达到能耗与需求同时满足；减少能耗的损失。
The invention is a coupled compression and absorption high-temperature heat pump system. The system includes the following devices: a first water storage tank, a low-temperature compressor, a high-temperature compressor, a condenser, a first condenser, a second evaporator, and an absorber. Generator, first heat exchanger, second heat exchanger and third water storage tank; the first water storage tank, low temperature compressor, high temperature compressor, condenser, first condenser, second evaporator , the absorber, the generator, the first heat exchanger, the second heat exchanger and the third water storage tank are connected through connecting pipelines; the system includes a compression heat pump system and an absorption heat pump system; a compression heat pump system Including low temperature grade circulation system and high temperature grade circulation system. The present invention divides the compression heat pump system into a low-temperature level circulation system and a high-temperature level circulation system, and combines it with the absorption heat pump system to freely regulate path selection according to the demand for liquid temperature, so as to meet energy consumption and demand at the same time; reduce energy consumption. loss.
Description
Technical Field
The invention belongs to the technical field of waste heat recovery and circulation systems, and particularly relates to a coupling compression and absorption type high-temperature heat pump system and a method thereof.
Background
The single-stage compression heat pump system cannot generate hot water with higher temperature due to the limitation of the compression ratio of the compressor, and when the ambient temperature is lower than zero, the temperature of the hot water is more limited and the energy consumption is larger. The two-stage cascade heat pump system can better produce hot water in a low-temperature environment, but the system still needs to consume great energy consumption to prepare hot water at 75-100 ℃, and the compression ratio of the compressor is large, so that the exhaust temperature of the compressor is easy to exceed the temperature, and the compressor is easy to fail. The second type of absorption heat pump can be a temperature-rising heat pump, which can utilize a lower temperature heat source to generate a higher temperature heat source for users to use, but the absorption heat pump needs a cold source to condense water vapor at the outlet of the generator because of system requirements in the operation process.
The compression absorption type waste heat recovery heat pump circulation system which is thermally coupled in Chinese patent publication (application number: 201710662315.6, application publication number: CN 107490210A) comprises a compression type heat pump sub-circulation system and an absorption type heat pump sub-circulation system; the compression heat pump sub-cycle system comprises a compressor, a first compression cycle condenser, a second compression cycle condenser and a compression cycle evaporator; the absorption heat pump sub-circulation system comprises an absorber, a generator, a solution pump, a refrigerant pump, an absorption circulation condenser, an absorption circulation evaporator and a solution heat recoverer; the thermally coupled compression absorption type waste heat recovery heat pump circulation system further comprises a first throttle valve and a second throttle valve; the absorption circulation evaporator, the first throttle valve, the compressor, the second throttle valve absorber, the generator, the solution pump, the refrigerant pump and the solution heat recoverer are all connected with each other through connecting pipelines.
With reference to the above-disclosed chinese patent thermally coupled compression absorption type heat pump cycle system, the following disadvantages are still provided: the compression type absorption and absorption type system cannot be fused efficiently, the energy loss is reduced, and the outlet water temperature can be regulated and controlled.
Disclosure of Invention
The invention aims at the defects and provides a coupling compression and absorption type high-temperature heat pump system and a method thereof, which are convenient to use and low in energy consumption.
The invention is realized by the following steps: a coupled compression and absorption high temperature heat pump system, the system comprising a compression heat pump system and an absorption heat pump system, characterized in that: the compression heat pump system comprises a low-temperature-level circulating system and a high-temperature-level circulating system;
the low-temperature-stage circulating system comprises a first water storage tank, a low-temperature compressor, a first evaporator, an evaporation condenser, a second evaporator and a generator;
the high-temperature-stage circulating system comprises a first water storage tank, a high-temperature compressor, an evaporation condenser, a first condenser, a second evaporator and a generator;
the absorption heat pump system comprises a second condenser, a second evaporator, an absorber, a generator, a first heat exchanger, a second heat exchanger and a third water storage tank;
the first water storage tank, the low-temperature compressor, the high-temperature compressor, the condenser, the first condenser, the second evaporator, the absorber, the generator, the first heat exchanger, the second heat exchanger and the third water storage tank are connected through connecting pipelines.
A method for coupling compression and absorption type high-temperature heat pump comprises the step of performing cyclic heat exchange between devices by a coupling compression and absorption type high-temperature heat pump system.
Preferably, the low temperature stage circulation system comprises a first pathway, a second pathway and a third pathway; the first path further comprises a first electromagnetic expansion valve, and the first path is as follows: the low-temperature compressor is connected with the evaporation condenser, the evaporation condenser is connected with the first electromagnetic expansion valve, the first electromagnetic expansion valve is connected with the first evaporator, and the first evaporator is connected with the low-temperature compressor;
the second path further comprises a first centrifugal pump, a second stop valve and a third stop valve, and is as follows: the first water storage tank is connected with a second stop valve, the second stop valve is connected with an evaporation condenser, the evaporation condenser is connected with a first centrifugal pump, the first centrifugal pump is connected with a third stop valve, the third stop valve is connected with a generator, and the generator is connected with the first water storage tank;
the third path further comprises a first centrifugal pump, a second stop valve and a fourth stop valve, and is as follows: the first water storage tank is connected with a second stop valve, the second stop valve is connected with an evaporation condenser, the evaporation condenser is connected with a first centrifugal pump, the first centrifugal pump is connected with a fourth stop valve, the fourth stop valve is connected with a second evaporator, and the second evaporator returns to the first water storage tank.
Preferably, the high temperature stage circulation system comprises a fourth pathway, a fifth pathway and a sixth pathway; the fourth path comprises a second electromagnetic expansion valve, and the fourth path is as follows: the high-temperature compressor is connected with the first condenser, the first condenser is connected with the second electromagnetic expansion valve, the second electromagnetic expansion valve is connected with the evaporation condenser, and the evaporation condenser is connected with the high-temperature compressor;
the fifth path comprises a first centrifugal pump and a third stop valve, and is as follows: the first water storage tank is connected with a first stop valve, the first stop valve is connected with a first condenser, the first condenser is connected with a first centrifugal pump, the first centrifugal pump is connected with a third stop valve, the third stop valve is connected with a generator, and the generator is connected with the first water storage tank;
the sixth path comprises a first centrifugal pump and a first stop valve, and is that: the first stop valve is connected to first water storage tank, and first condenser is connected to first stop valve, and first centrifugal pump is connected to first condenser, and fourth stop valve is connected to first centrifugal pump, and the second evaporator is connected to fourth stop valve, and the second evaporator returns to first water storage tank.
Preferably, the absorption heat pump system comprises a seventh pathway, an eighth pathway and a ninth pathway; the seventh path comprises a second centrifugal pump and a third electromagnetic expansion valve, and the seventh path is as follows: the generator is connected with the second condenser, the second condenser is connected with the second centrifugal pump, the second centrifugal pump is connected with the second evaporator, and the second evaporator is connected with the absorber; the absorber is connected with the second heat exchanger, the second heat exchanger is connected with the first heat exchanger, the first heat exchanger is connected with the third electromagnetic expansion valve, the third electromagnetic expansion valve is connected with the generator, the generator is connected with the first heat exchanger, and the first heat exchanger is connected with the absorber;
the eighth path comprises a fifth centrifugal pump and a third electromagnetic expansion valve, and is as follows: the generator is connected with a fifth centrifugal pump, the fifth centrifugal pump is connected with a first heat exchanger, the first heat exchanger is connected with an absorber, the absorber is connected with a second heat exchanger, the second heat exchanger is connected with the first heat exchanger, the first heat exchanger is connected with a third electromagnetic expansion valve, the third electromagnetic expansion valve is connected with the generator, the generator is connected with the first heat exchanger, and the first heat exchanger is connected with the absorber;
the ninth path includes a seventh shut-off valve, the ninth path being: the absorber is connected with the second heat exchanger, the second heat exchanger is connected with the third water storage tank, the third water storage tank is connected with the seventh stop valve, the seventh stop valve is connected with the sixth water pump, and the sixth water pump is connected with the second heat exchanger to form circulation.
Preferably, the system comprises a waste heat recovery and circulation system, wherein the waste heat recovery and circulation system comprises a first evaporator (4), a second water storage tank and a second condenser; the waste heat recovery cycle includes a tenth pathway and an eleventh pathway;
the tenth way comprises a second centrifugal pump and a fifth stop valve, and is as follows: the second water storage tank is connected with a fifth stop valve, the fifth stop valve is connected with a second centrifugal pump, the second centrifugal pump is connected with a first evaporator, and the first evaporator is connected with the second water storage tank;
the eleventh path includes a fourth centrifugal pump and a sixth shut-off valve: the second water storage tank is connected with a sixth stop valve, the sixth stop valve is connected with a fourth centrifugal pump, the fourth centrifugal pump is connected with a second condenser, and the second condenser is connected with the second water storage tank.
Preferably, in the tenth approach, a first thermometer is provided between the first heat exchanger and the second water storage tank connected by a pipe. When the temperature of the first thermometer exceeds 15 ℃, controlling the external fan to stop running; when the temperature of the first thermometer is lower than 10 ℃, the external fan starts to operate.
Preferably, a second pressure gauge is arranged between the pipelines of the second evaporator connected with the absorber in the seventh path;
a first pressure gauge is arranged between the pipelines of the first heat exchanger connected with the absorber;
in the ninth way, a second thermometer is arranged between the third water storage tank and the seventh stop valve. The second thermometer is used for displaying the temperature of the third water storage tank.
Preferably, an external fan is connected to the outer side of the first evaporator. For releasing the cooling capacity of the first evaporator into the environment.
The invention has the beneficial effects that: 1. the compression heat pump system is divided into a low-temperature-level circulating system and a high-temperature-level circulating system, and is combined with the absorption heat pump system, so that path selection is freely regulated and controlled according to the requirement of liquid temperature, and the energy consumption and the requirement are simultaneously met; and the loss of energy consumption is reduced.
2. The power consumption of the low-temperature compressor and the high-temperature compressor is further reduced through a waste heat recovery circulating system in the absorption heat pump system; solves the source problem of cold source in the absorption heat pump system, and reduces the operation energy consumption to the maximum extent.
Drawings
FIG. 1 is an overall block diagram of the present invention;
wherein 1 is a first water storage tank, 2 is a low temperature compressor, 3 is a high temperature compressor, 4 is a first evaporator, 5 is an external fan, 6 is an evaporation condenser, 7 is a first condenser, 8 is a first centrifugal pump, 9 is a second water storage tank, 10 is a third centrifugal pump, 11 is a fourth centrifugal pump, 12 is a second condenser, 13 is a second centrifugal pump, 14 is a second evaporator, 15 is an absorber, 16 is a generator, 17 is a fifth centrifugal pump, 18 is a first heat exchanger, 19 is a second heat exchanger, 20 is a third water storage tank, 21 is a sixth centrifugal pump, 22 is a first stop valve, 23 is a second stop valve, 24 is a first electromagnetic expansion valve, 25 is a second electromagnetic expansion valve, 26 is a first thermometer, 27 is a third stop valve, 28 is a fourth stop valve, 29 is a fifth stop valve, 30 is a sixth stop valve, 31 is a first pressure gauge, 32 is a second pressure gauge, 33 is a third electromagnetic expansion valve, 34 is a seventh stop valve, and 35 is a seventh stop valve.
Detailed Description
The invention is further outlined below in connection with the accompanying drawings.
As shown in fig. 1, a high temperature heat pump system for coupling compression and absorption, comprising: a low temperature compressor 2, a high temperature compressor 3, a first evaporator 4, a second evaporator 14, a first condenser 7, a second condenser 12, an evaporation condenser 6, a first water storage tank 1, a second water storage tank 9, a third water storage tank 20, a generator 16, an absorber 15, a first heat exchanger 18, a second heat exchanger 19, a first shut-off valve 22, a second shut-off valve 23, a third shut-off valve 27, a fourth shut-off valve 28, a fifth shut-off valve 29, a sixth shut-off valve 30, a seventh shut-off valve 35, a first electromagnetic expansion valve 24, a second electromagnetic expansion valve 25, a third electromagnetic expansion valve 33, a first centrifugal pump 8, a second centrifugal pump 13, a third centrifugal pump 10, a fourth centrifugal pump 11, a fifth centrifugal pump 17, a sixth centrifugal pump 21, a first pressure gauge 31, a second pressure gauge 32, a first temperature gauge 26, and a second temperature gauge 34; the working media are connected through pipelines. The system comprises a compression heat pump system and an absorption heat pump system; the compression heat pump system comprises a low-temperature-level circulating system and a high-temperature-level circulating system; the absorption pump system also comprises a waste heat recovery circulation system.
Further, the low temperature stage circulatory system includes a first pathway, a second pathway, and a third pathway; the high temperature stage circulatory system comprises a fourth path, a fifth path and a sixth path; the endothermic heat pump cycle system includes a seventh pathway, an eighth pathway, and a ninth pathway; the waste heat recovery circulation system comprises a tenth path and an eleventh path;
the first route is as follows: the low-temperature compressor 2 is connected with the evaporation condenser 6, the evaporation condenser 6 is connected with the first electromagnetic expansion valve 24, the first electromagnetic expansion valve 24 is connected with the first evaporator 4, and the first evaporator 4 is connected with the low-temperature compressor 2;
the second route is as follows: the first water storage tank 1 is connected with a second stop valve 23, the second stop valve 23 is connected with an evaporation condenser 6, the evaporation condenser 6 is connected with a first centrifugal pump 8, the first centrifugal pump 8 is connected with a third stop valve 27, the third stop valve 27 is connected with a generator 16, and the generator 16 is connected with the first water storage tank 1;
the third approach is: the first water storage tank 1 is connected with a second stop valve 23, the second stop valve 23 is connected with an evaporation condenser 6, the evaporation condenser 6 is connected with a first centrifugal pump 8, the first centrifugal pump 8 is connected with a fourth stop valve 28, the fourth stop valve 28 is connected with a second evaporator 14, and the second evaporator 14 returns to the first water storage tank 1; the fourth route is as follows: the high-temperature compressor 3 is connected with the first condenser 7, the first condenser 7 is connected with the second electromagnetic expansion valve 25, the second electromagnetic expansion valve 25 is connected with the evaporation condenser 6, and the evaporation condenser 6 is connected with the high-temperature compressor 3;
the fifth route is as follows: the first water storage tank 1 is connected with a first stop valve 22, the first stop valve 22 is connected with a first condenser 7, the first condenser 7 is connected with a first centrifugal pump 8, the first centrifugal pump 8 is connected with a third stop valve 27, the third stop valve 27 is connected with a generator 16, and the generator 16 is connected with the first water storage tank 1; the sixth route is as follows: the first water storage tank 1 is connected with a first stop valve 22, the first stop valve 22 is connected with a first condenser 7, the first condenser 7 is connected with a first centrifugal pump 8, the first centrifugal pump 8 is connected with a fourth stop valve 28, the fourth stop valve 28 is connected with a second evaporator 14, and the second evaporator 14 returns to the first water storage tank 1.
The seventh route is as follows: the generator 16 is connected with the second condenser 12, the second condenser 12 is connected with the second centrifugal pump 13, the second centrifugal pump 13 is connected with the second evaporator 14, the second evaporator 14 is connected with the second pressure gauge 32, and the second pressure gauge 32 is connected with the absorber 15; the absorber 15 is connected with the second heat exchanger 19, the second heat exchanger 19 is connected with the first heat exchanger 18, the first heat exchanger 18 is connected with the third electromagnetic expansion valve 33, the third electromagnetic expansion valve 33 is connected with the generator 16, the generator 16 is connected with the first heat exchanger 18, the first heat exchanger 18 is connected with the first pressure gauge 31, and the first pressure gauge 31 is connected with the absorber 15;
the eighth route is as follows: the generator 16 is connected with the fifth centrifugal pump 17, the fifth centrifugal pump 17 is connected with the first heat exchanger 18, the first heat exchanger 18 is connected with the absorber 15, the absorber 15 is connected with the second heat exchanger 19, the second heat exchanger 19 is connected with the first heat exchanger 18, the first heat exchanger 18 is connected with the third electromagnetic expansion valve 33, the third electromagnetic expansion valve 33 is connected with the generator 16, the generator 16 is connected with the first heat exchanger 18, the first heat exchanger 18 is connected with the first pressure gauge 31, and the first pressure gauge 31 is connected with the absorber 15;
the ninth route is: the absorber 15 is connected with the second heat exchanger 19, the second heat exchanger 19 is connected with the third water storage tank 20, the third water storage tank 20 is connected with the second thermometer 34, the second thermometer 34 is connected with the seventh stop valve 35, the seventh stop valve 35 is connected with the sixth water pump, and the sixth water pump is connected with the second heat exchanger 19 to form circulation;
the tenth route is as follows: the second water storage tank 9 is connected with a fifth stop valve 29, the fifth stop valve 29 is connected with the second centrifugal pump 13, the second centrifugal pump 13 is connected with the first evaporator 4, the first evaporator 4 is connected with the first thermometer 26, and the first thermometer 26 is connected with the second water storage tank 9;
the eleventh route is: the second water storage tank 9 is connected with a sixth stop valve 30, the sixth stop valve 30 is connected with a fourth centrifugal pump 11, the fourth centrifugal pump 11 is connected with a second condenser 12, and the second condenser 12 is connected with the second water storage tank 9.
The coupling approach separates the coupled compression and absorption heat pump system into a first mode of operation and a second mode of operation.
Further, in the first working mode, the condition that the temperature of hot water is required to be 50-75 ℃ is solved, and the first stop valve 22 is closed; the low-temperature compressor 2 is connected with the evaporation condenser 6, the evaporation condenser 6 is connected with the first electromagnetic expansion valve 24, the first electromagnetic expansion valve 24 is connected with the first evaporator 4, and the first evaporator 4 is connected with the low-temperature compressor 2; the first evaporator 4 returns a part of heat to the low-temperature compressor 2, and simultaneously, in combination with the tenth way, the first evaporator 4 returns another part of heat to the second water storage tank 9, the second water storage tank 9 conveys the cold solution in the second water storage tank 9 to the first evaporator 4 through the third centrifugal pump 10 by opening the fifth stop valve 29, and then returns to the second water storage tank 9 to form a waste heat recovery cycle; meanwhile, in the second path, the first water storage tank 1 is connected to the evaporation condenser 6 through the second stop valve 23, the evaporation condenser 6 is transmitted to the first centrifugal pump 8 through the evaporation condenser 6 through the circulation of the first path, the first centrifugal pump 8 divides the liquid into two paths, one path is connected to the generator 16 through the third stop valve 27, and the generator 16 returns the solution to the first water storage tank 1; the other way is connected with the second evaporator 14 through a fourth stop valve 28, the second evaporator 14 changes the liquid into water vapor, and the water vapor and the liquid in the generator 16 are combined and returned to the first water storage tank 1; meanwhile, in combination with the seventh path, the generator 16 transmits part of heat to the second heat exchanger 19 through the second condenser 12 and the second centrifugal pump 13, and the absorber 15 favors part of heat of the second heat exchanger 19 and returns to the generator 16 through the second heat exchanger 19 and the first heat exchanger 18 to form heat absorption circulation; while absorbing heat, in the eleventh route, the heat favored by the second water storage tank 9 is transferred to the second condenser 12 by the fourth centrifugal pump 11, and returned to the absorber 15 by the second condenser 12.
Further, in the second working mode, the condition that the temperature of hot water is required to be 75-100 ℃ is solved, and the second stop valve 23 is closed;
in the fifth way, the first stop valve 22 is opened, the liquid in the first water storage tank 1 enters the first condenser 7, in the fourth way, the high-temperature compressor 3 transmits heat to the first condenser 7 to be combined with the liquid in the first water storage tank 1, the first condenser 7 is divided into two paths, and one path transmits the liquid to the first centrifugal pump 8; the other path passes through the evaporation condenser 6 and is connected with the first evaporator 4 through the first electromagnetic expansion valve 24, the first evaporator 4 returns the heat to the second water storage tank 9 through a tenth path, the second water storage tank 9 conveys the cold solution in the second water storage tank 9 into the first evaporator 4 through the third centrifugal pump 10 by opening the fifth stop valve 29 and then returns the cold solution to the second water storage tank 9 to form a waste heat recovery cycle; the first condenser 7 passes through the first centrifugal pump 8, the first centrifugal pump 8 divides the liquid into two paths, one path passes through the third stop valve 27 and is connected to the generator 16, and the generator 16 returns the solution to the first water storage tank 1;
the other way is connected with the second evaporator 14 through a fourth stop valve 28, the second evaporator 14 changes the liquid into water vapor, and the water vapor and the liquid in the generator 16 are combined and returned to the first water storage tank 1; meanwhile, in combination with the seventh path, the generator 16 transmits part of heat to the second heat exchanger 19 through the second condenser 12 and the second centrifugal pump 13, and the absorber 15 favors part of heat of the second heat exchanger 19 and returns to the generator 16 through the second heat exchanger 19 and the first heat exchanger 18 to form heat absorption circulation; while absorbing heat, in the eleventh way, the heat favored by the second water storage tank 9 is transferred to the second condenser 12 through the fourth centrifugal pump 11, and returned to the absorber 15 through the second condenser 12; the heat of the absorber 15 is transmitted outwards through the second heat exchanger 19, the output of the second heat exchanger 19 is two paths, one path returns to the absorber 15 through the first heat exchanger 18 and the generator 16, the other path returns to the third water storage tank 20, and the third water storage tank 20 can exchange heat with the second heat through the sixth centrifugal pump 21 to form heat absorption circulation; using the ninth approach, the temperature of the water in the third water storage tank 20 is greater than the temperature of the water in the first water storage tank 1.
The working process comprises the following steps: when the hot water temperature requirement is 50-75 ℃, the low-temperature-stage circulating system in the compression heat pump system is started, the high-temperature-stage circulating system is closed, the outlet pressure of the third electromagnetic valve 33 is adjusted to 15kPa, the operating pressure of the generator 16 is adjusted to 15kPa, the first stop valve 22 is closed, the second stop valve 23 is opened, the compression ratio of the low-temperature compressor 2 is adjusted, the high-temperature high-pressure refrigerant condenses and releases heat to water in the water storage tank 1 in the evaporation condenser 6, the first centrifugal pump 8 conveys hot water in the water storage tank 1 to the generator 16 through the third stop valve 27, the lithium bromide dilute solution in the generator 16 is heated, moisture in the lithium bromide dilute solution is evaporated out and enters the second condenser 12, the other path enters the second evaporator 14 through the fourth stop valve 28, all water at the outlet of the second centrifugal pump 13 is evaporated into vapor, and the water at the outlet of the second evaporator 14 and the water at the outlet of the generator 16 are converged and then enter the water storage tank 1 to enter the next circulation. The refrigerant is condensed by the evaporation condenser 6, throttled and depressurized by the first electronic expansion valve 24, enters the first evaporator 4, absorbs heat in the environment, turns into gas, and enters the air suction port of the low-temperature compressor 2. Part of the cold energy released by the first evaporator 4 is released into the environment through the external fan, the other part of the cold energy is stored by the second water storage tank 9, the salt solution at the outlet of the third centrifugal pump 10 enters the first evaporator 4, and the salt solution returns to the second water storage tank 9 after the cold energy is extracted. The fourth centrifugal pump 11 delivers chilled brine to the second condenser 12, condensing the water vapor at the generator 16 outlet into saturated water.
When the hot water temperature requirement is 75-100 ℃, the low-temperature-level circulation system and the high-temperature circulation in the compression heat pump system are started simultaneously. The outlet pressure of the third electromagnetic valve 33 is adjusted to 25kPa, the operating pressure of the generator 16 is adjusted to 25kPa, the second stop valve 23 is closed, the first stop valve 22 is opened, the operating frequency of the low-temperature compressor 2 is adjusted according to the environmental temperature demand, the high-temperature refrigerant at the exhaust port of the low-temperature compressor 2 in the low-temperature cycle transfers heat to the refrigerant in the high-temperature cycle through the evaporation condenser 6, the refrigerant in the high-temperature cycle is vaporized and then enters the air suction port of the high-temperature compressor 3, the refrigerant is heated and boosted and then enters the first condenser 7, and the heat is released to the water in the first water storage tank 1 by the heat released by the condensation of the refrigerant in the first condenser 7. The first centrifugal pump 8 conveys hot water in the water storage tank 1 to the generator 16 through the third stop valve 27, heats the lithium bromide dilute solution in the generator 16, water in the lithium bromide dilute solution is evaporated to enter the second condenser 12, the other path enters the second evaporator 14 through the fourth stop valve 28, working medium water in the second evaporator 14 absorbs heat of the hot water to be evaporated into water vapor and then enters the absorber 15, and water at the outlet of the second evaporator 14 and water at the outlet of the generator 16 are converged and then enter the water storage tank 1 to enter the next cycle.
The foregoing description is only illustrative of the invention and is not to be construed as limiting the invention. Various modifications and variations of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, or the like, which is within the spirit and principles of the present invention, should be included in the scope of the claims of the present invention.
Claims (6)
1. A coupled compression and absorption high temperature heat pump system, the system comprising a compression heat pump system and an absorption heat pump system, characterized in that: the compression heat pump system comprises a low-temperature-level circulating system and a high-temperature-level circulating system;
the low-temperature-level circulating system comprises a first water storage tank (1), a low-temperature compressor (2), a first evaporator (4), an evaporation condenser (6), a second evaporator (14) and a generator (16);
the high-temperature-stage circulating system comprises a first water storage tank (1), a high-temperature compressor (3), an evaporation condenser (6), a first condenser (7), a second evaporator (14) and a generator (16);
the absorption heat pump system comprises a second condenser (12), a second evaporator (14), an absorber (15), a generator (16), a first heat exchanger (18), a second heat exchanger (19) and a third water storage tank (20);
the first water storage tank (1), the low-temperature compressor (2), the high-temperature compressor (3), the condenser (6), the first condenser (7), the second evaporator (14), the absorber (15), the generator (16), the first heat exchanger (18), the second heat exchanger (19) and the third water storage tank (20) are connected through connecting pipelines;
the cryogenic stage cycle system comprises a first pathway, a second pathway, and a third pathway;
the first path includes a first electromagnetic expansion valve (24), the first path being: the low-temperature compressor (2) is connected with the evaporation condenser (6), the evaporation condenser (6) is connected with the first electromagnetic expansion valve (24), the first electromagnetic expansion valve (24) is connected with the first evaporator (4), and the first evaporator (4) is connected with the low-temperature compressor (2);
the second path further comprises a first centrifugal pump (8), a second stop valve (23) and a third stop valve (27), and is: the first water storage tank (1) is connected with a second stop valve (23), the second stop valve (23) is connected with the evaporation condenser (6), the evaporation condenser (6) is connected with the first centrifugal pump (8), the first centrifugal pump (8) is connected with a third stop valve (27), the third stop valve (27) is connected with the generator (16), and the generator (16) is connected with the first water storage tank (1);
the third path further comprises a first centrifugal pump (8), a second stop valve (23) and a fourth stop valve (28), and is as follows: the first water storage tank (1) is connected with a second stop valve (23), the second stop valve (23) is connected with the evaporation condenser (6), the evaporation condenser (6) is connected with the first centrifugal pump (8), the first centrifugal pump (8) is connected with a fourth stop valve (28), the fourth stop valve (28) is connected with the second evaporator (14), and the second evaporator (14) returns to the first water storage tank (1);
the high temperature stage circulation system includes a fourth pathway, a fifth pathway, and a sixth pathway;
the fourth path comprises a second electromagnetic expansion valve (25), and the fourth path is as follows: the high-temperature compressor (3) is connected with the first condenser (7), the first condenser (7) is connected with the second electromagnetic expansion valve (25), the second electromagnetic expansion valve (25) is connected with the evaporation condenser (6), and the evaporation condenser (6) is connected with the high-temperature compressor (3);
the fifth route comprises a first centrifugal pump (8) and a third shut-off valve (27), and is: the first water storage tank (1) is connected with a first stop valve (22), the first stop valve (22) is connected with a first condenser (7), the first condenser (7) is connected with a first centrifugal pump (8), the first centrifugal pump (8) is connected with a third stop valve (27), the third stop valve (27) is connected with a generator (16), and the generator (16) is connected with the first water storage tank (1);
the sixth path comprises a first centrifugal pump (8) and a first shut-off valve (22), the sixth path being: the first water storage tank (1) is connected with a first stop valve (22), the first stop valve (22) is connected with a first condenser (7), the first condenser (7) is connected with a first centrifugal pump (8), the first centrifugal pump (8) is connected with a fourth stop valve (28), the fourth stop valve (28) is connected with a second evaporator (14), and the second evaporator (14) returns to the first water storage tank (1);
the absorption heat pump system includes a seventh pathway, an eighth pathway, and a ninth pathway;
the seventh path comprises a second centrifugal pump (13) and a third electromagnetic expansion valve (33), and is as follows: the generator (16) is connected with the second condenser (12), the second condenser (12) is connected with the second centrifugal pump (13), the second centrifugal pump (13) is connected with the second evaporator (14), and the second evaporator (14) is connected with the absorber (15); the absorber (15) is connected with the second heat exchanger (19), the second heat exchanger (19) is connected with the first heat exchanger (18), the first heat exchanger (18) is connected with the third electromagnetic expansion valve (33), the third electromagnetic expansion valve (33) is connected with the generator (16), the generator (16) is connected with the first heat exchanger (18), and the first heat exchanger (18) is connected with the absorber (15);
the eighth path comprises a fifth centrifugal pump (17) and a third electromagnetic expansion valve (33), and is as follows: the generator (16) is connected with the fifth centrifugal pump (17), the fifth centrifugal pump (17) is connected with the first heat exchanger (18), the first heat exchanger (18) is connected with the absorber (15), the absorber (15) is connected with the second heat exchanger (19), the second heat exchanger (19) is connected with the first heat exchanger (18), the first heat exchanger (18) is connected with the third electromagnetic expansion valve (33), the third electromagnetic expansion valve (33) is connected with the generator (16), the generator (16) is connected with the first heat exchanger (18), and the first heat exchanger (18) is connected with the absorber (15);
the ninth path includes a seventh shut-off valve (35), the ninth path being: the absorber (15) is connected with the second heat exchanger (19), the second heat exchanger (19) is connected with the third water storage tank (20), the third water storage tank (20) is connected with the seventh stop valve (35), the seventh stop valve (35) is connected with the sixth water pump, and the sixth water pump is connected with the second heat exchanger (19) to form circulation;
the system comprises a waste heat recovery and circulation system, wherein the waste heat recovery and circulation system comprises a first evaporator (4), a second water storage tank (9) and a second condenser (12); the waste heat recovery circulation system comprises a tenth path and an eleventh path;
the tenth path comprises a second centrifugal pump (13) and a fifth shut-off valve (29), the tenth path being: the second water storage tank (9) is connected with a fifth stop valve (29), the fifth stop valve (29) is connected with a second centrifugal pump (13), the second centrifugal pump (13) is connected with the first evaporator (4), and the first evaporator (4) is connected with the second water storage tank (9);
the eleventh path including a fourth centrifugal pump (11) and a sixth shut-off valve (30) is: the second water storage tank (9) is connected with a sixth stop valve (30), the sixth stop valve (30) is connected with a fourth centrifugal pump (11), the fourth centrifugal pump (11) is connected with a second condenser (12), and the second condenser (12) is connected with the second water storage tank (9).
2. The system according to claim 1, wherein: in the tenth way, a first thermometer is arranged between the first heat exchanger (18) and the second water storage tank (9) which are connected through a pipeline.
3. The system according to claim 1, wherein: a second pressure gauge (32) is arranged between the pipelines of the second evaporator (14) connected with the absorber (15) in the seventh path;
a first pressure gauge (31) is arranged between the pipelines of the first heat exchanger (18) connected with the absorber (15);
in the ninth way, a second thermometer is arranged between the third water storage tank (20) and the seventh stop valve (35).
4. The system according to claim 1, wherein: in the tenth way, the waste heat is recycled to the second water storage tank (9), and the waste heat is recycled to the absorber (15) through the second condenser (12) in the eleventh way and the ninth way.
5. The system according to claim 1, wherein: an external fan (5) is connected to the outer side of the first evaporator (4).
6. A method for coupling compression and absorption type high-temperature heat pump is characterized in that: comprising the step of performing cyclic heat exchange between devices by using a coupled compression and absorption high temperature heat pump system according to any one of claims 1 to 5, specifically:
when the hot water temperature requirement is 50-75 ℃, a low-temperature-stage circulating system in the compression heat pump system is started, a high-temperature-stage circulating system is closed, the outlet pressure of a third electromagnetic valve 33 is adjusted to 15kPa, the operating pressure of a generator 16 is adjusted to 15kPa, a first stop valve 22 is closed, a second stop valve 23 is opened, the compression ratio of the low-temperature compressor 2 is adjusted, high-temperature and high-pressure refrigerant condenses and releases heat to water in a water storage tank 1 in an evaporation condenser 6, the first centrifugal pump 8 conveys hot water in the water storage tank 1 to the generator 16 through a third stop valve 27, lithium bromide dilute solution in the generator 16 is heated, moisture in the lithium bromide dilute solution is evaporated out and enters a second condenser 12, the other path enters the second evaporator 14 through a fourth stop valve 28 to completely evaporate water at the outlet of the second centrifugal pump 13 into vapor, and the water at the outlet of the second evaporator 14 and the water at the outlet of the generator 16 are converged and enter the water storage tank 1 to enter the next circulation; the refrigerant is condensed by the evaporation condenser 6, throttled and depressurized by the first electronic expansion valve 24, enters the first evaporator 4, absorbs heat in the environment, turns into gas, and enters the air suction port of the low-temperature compressor 2; part of the cold energy released by the first evaporator 4 is released into the environment through an external fan, and the other part of the cold energy is stored by the second water storage tank 9, and the salt solution at the outlet of the third centrifugal pump 10 enters the first evaporator 4 and returns to the second water storage tank 9 after the cold energy is drawn; the fourth centrifugal pump 11 conveys the chilled brine to the second condenser 12, and condenses the water vapor at the outlet of the generator 16 into saturated water;
when the hot water temperature requirement is 75-100 ℃, the low-temperature-level circulation system and the high-temperature circulation in the compression heat pump system are started simultaneously; the outlet pressure of the third electromagnetic valve 33 is regulated to 25kPa, the operating pressure of the generator 16 is regulated to 25kPa, the second stop valve 23 is closed, the first stop valve 22 is opened, the operating frequency of the low-temperature compressor 2 is regulated according to the environmental temperature requirement, the high-temperature refrigerant at the exhaust port of the low-temperature compressor 2 in the low-temperature cycle transfers heat to the refrigerant in the high-temperature cycle through the evaporation condenser 6, the refrigerant in the high-temperature cycle is vaporized and then enters the air suction port of the high-temperature compressor 3, the refrigerant is heated and boosted and then enters the first condenser 7, and the heat is released to the water in the first water storage tank 1 by the heat released by the condensation of the refrigerant in the first condenser 7; the first centrifugal pump 8 conveys hot water in the water storage tank 1 to the generator 16 through the third stop valve 27, heats the lithium bromide dilute solution in the generator 16, water in the lithium bromide dilute solution is evaporated to enter the second condenser 12, the other path enters the second evaporator 14 through the fourth stop valve 28, working medium water in the second evaporator 14 absorbs heat of the hot water to be evaporated into water vapor and then enters the absorber 15, and water at the outlet of the second evaporator 14 and water at the outlet of the generator 16 are converged and then enter the water storage tank 1 to enter the next cycle.
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| JPH08247571A (en) * | 1995-03-14 | 1996-09-27 | Toshiba Corp | Air conditioner |
| CN103411347A (en) * | 2013-08-27 | 2013-11-27 | 苏州新华软智能装备有限公司 | Coupling type heat pump waste heat recovery system |
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