A high-efficiency absorption heat pump

Abstract

The present invention discloses a high-efficiency absorption heat pump, including a cooling tower, a condenser, an evaporator, an absorber, a solution heat exchanger, a high-pressure generator, a gas-liquid separator, a low-pressure generator, a subcooler and a liquid reservoir. The evaporator and the subcooler are connected to the liquid reservoir, the liquid reservoir is respectively connected to the evaporator and the subcooler, the absorber is connected to the low-pressure generator, and the high-pressure generator, the solution heat exchanger and the gas-liquid separator form a gas-liquid separation structure and a liquid circulation structure. The present invention realizes the advantages of energy utilization efficiency of traditional absorption refrigerants, and combines the water pipelines of the evaporator and the subcooler to operate in parallel; internal energy ladder cooling is achieved through a heat exchanger, and the unit cooling capacity is increased through a subcooler. Finally, heat recovery is used to improve the overall energy efficiency and system utilization. The heat of the concentrated solution can be transferred to the dilute solution through three groups of heat exchangers, which reduces the equipment investment required for cooling and reduces the heat consumption of heating the dilute solution.

Description

Technical Field

[0001] The invention relates to the technical field of thermal energy utilization devices, and in particular to an absorption heat pump. Background Art

[0002] An absorption heat pump is a circulation system that utilizes low-grade heat sources to pump heat from a low-temperature heat source to a high-temperature heat source. It is an effective device for recycling and utilizing low-temperature thermal energy.

[0003] Absorption heat pump, also known as heat-increasing heat pump, uses a small amount of high-temperature heat source (such as steam, high-temperature hot water, combustible gas combustion heat, etc.) as the driving heat source to generate a large amount of medium-temperature heat energy. That is, it uses high-temperature heat energy to drive and raise the heat energy of low-temperature heat source to medium temperature, thereby improving the utilization efficiency of heat energy.

[0004] At present, the absorption heat pump uses lithium bromide units as the first type of absorption heat pump to complete refrigeration, which is composed of cooling towers, condensers, generators, evaporators, absorbers, solution heat exchangers, air conditioning heat exchangers and other components. However, due to its defects in refrigeration efficiency and energy utilization, it can only be used in occasions such as industrial waste heat generation and waste heat utilization. Such a single function makes the utilization rate of lithium bromide units relatively low, resulting in an increase in investment costs and operating costs, and is at a clear disadvantage compared with compression heat pumps. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a high-efficiency absorption heat pump with a more reasonable structural design and the ability to improve thermal efficiency through gas-liquid separation, heat exchange, supercooling, energy cascade utilization and other means in response to the defects of the prior art.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions: a high-efficiency absorption heat pump, comprising a cooling tower, a condenser, an evaporator, an absorber and a solution heat exchanger, the evaporator is connected to a user-side heat exchanger, and the condenser is connected to the absorber and the cooling tower, characterized in that: it also includes a high-pressure generator, a gas-liquid separator, a low-pressure generator, a subcooler and a liquid reservoir, the outlets of the evaporator and the subcooler are respectively connected to the inlet of the liquid reservoir, and the liquid outlet of the liquid reservoir is respectively connected to the water collecting pan of the evaporator and the subcooler, so that a liquid circulation structure is formed between the evaporator, the subcooler and the liquid reservoir; the liquid outlet pipe of the absorber is connected to the low-pressure generator, and the high-pressure generator forms a gas-liquid separation structure and a liquid circulation structure with the solution heat exchanger and the gas-liquid separator.

[0007] Furthermore, the solution heat exchanger includes a first heat exchanger, a second heat exchanger and a third heat exchanger. The concentrated solution outlet of the high-pressure generator is connected to the gas-liquid separator through the second heat exchanger. The gas outlet pipe of the gas-liquid separator is connected back to the high-pressure generator. The liquid outlet pipe of the gas-liquid separator is connected to the absorber through the first heat exchanger. The second heat exchanger is also connected to the high-pressure generator through the third heat exchanger.

[0008] Furthermore, it also includes a subcooling device, the refrigerant outlet pipeline of the condenser is connected to the subcooling device, the outlet of the subcooling device is connected to the inlet of the liquid reservoir, and the liquid outlet of the liquid reservoir is connected to the water collecting pan of the evaporator, the subcooler and the subcooling device through a refrigerant circulation pump, so that the subcooling pipeline forms a closed loop through the subcooling device, the liquid reservoir and the subcooler.

[0009] Furthermore, the liquid outlet pipe of the absorber is connected to the low-pressure generator through a refrigerant circulation pump.

[0010] Furthermore, the liquid outlet pipeline of the high-pressure generator and the liquid outlet pipeline of the gas-liquid separator are respectively connected to the second heat exchanger and the first heat exchanger.

[0011] Furthermore, a first valve is provided in the connecting pipeline between the refrigerant outlet pipeline of the liquid storage device and the evaporator, and a solution pump is connected in parallel at both ends of the first valve; a second valve is provided in the connecting pipeline between the refrigerant outlet pipeline of the liquid storage device and the supercooler, and a solution pump is connected in parallel at both ends of the second valve.

[0012] Furthermore, a third valve and a solution pump are provided between the concentrated solution outlet of the high pressure generator and the absorber.

[0013] Furthermore, a fourth valve is provided in the connecting pipeline between the cooling water outlet pipeline of the cooling tower and the absorber inlet, and a connecting pipeline is provided between the dilute solution outlet pipeline of the absorber and the gas-liquid separator inlet.

[0014] Furthermore, a fifth valve is provided at the inlet of the absorber, and a sixth valve is provided at the outlet of the condenser, so as to form a switching structure for realizing heat recovery.

[0015] Furthermore, a seventh valve is provided in the connecting pipeline between the refrigerant outlet pipeline of the liquid storage device and the supercooling device.

[0016] It includes single cooling condition, supercooling cooling condition and simultaneous cooling and heating condition, among which,

[0017] Under the single refrigeration condition, open the first valve, the third valve, the fourth valve, and the eighth valve, and close the second valve, the fifth valve, the sixth valve, and the seventh valve. Use the external high-temperature heat source to provide heat to the high-pressure generator to vaporize the water in the solution. The water enters the condenser and is cooled, and then is cooled again through the cooling device. After throttling and reducing the pressure, it flows into the evaporator and is sprayed on the chilled water supply pipe; it is then collected through the water tray and enters the liquid storage device, and is pumped into the evaporator by the circulation pump. After vaporization, it is absorbed by the lithium bromide concentrated solution in the absorber, and after becoming a dilute solution, it is pumped into the low-pressure generator through the first heat exchanger by the solution pump; after being heated in the low-pressure generator, it is converted into a high-temperature dilute solution, and enters the high-pressure generator through the second heat exchanger and the third heat exchanger respectively. The concentrated solution is further concentrated after passing through the second heat exchanger and releasing excess water vapor in the gas-liquid separator, and then enters the absorber after being cooled by the first heat exchanger, realizing self-spraying and completing the cycle;

[0018] Under the supercooling refrigeration condition, open the first valve, the second valve, the third valve, the fourth valve, the seventh valve, and the eighth valve, close the fifth valve and the sixth valve, use the external high-temperature heat source to provide heat to the high-pressure generator to vaporize the water in the solution, the water enters the condenser to be cooled, and then passes through the cooling device to be cooled again; then after throttling and reducing the pressure through the first valve, it flows into the liquid reservoir, and then is sprayed on the evaporator chilled water supply pipe and the supercooler supercooling water pipe through the circulation pump, and is collected through the water tray and enters the liquid reservoir; it is then pumped into the evaporator by the circulation pump, and after being vaporized, it is absorbed by the lithium bromide concentrated solution in the absorber, and after becoming a dilute solution, it is passed through the first heat exchanger by the solution pump to enter the low-pressure generator; after being heated in the low-pressure generator, it is converted into a high-temperature dilute solution, and enters the high-pressure generator through the second heat exchanger and the third heat exchanger respectively; the concentrated solution passes through the second heat exchanger and is further concentrated after releasing excess water vapor in the gas-liquid separator, and then enters the absorber after being cooled by the first heat exchanger, realizing self-spraying and completing the cycle;

[0019] At the same time, under the cooling and heating conditions, the first valve, the second valve, the third valve, the fifth valve, the sixth valve, the seventh valve, and the eighth valve are opened, and the fourth valve is closed. The external high-temperature heat source is used to provide heat to the high-pressure generator to vaporize the water in the solution. The water enters the condenser and is cooled, and then is cooled again through the cooling device, and then throttled and reduced in pressure by the first valve into the liquid reservoir; it is sprayed on the evaporator chilled water supply pipe and the supercooler supercooling water pipe through the circulation pump, and then collected through the water tray into the liquid reservoir, and then pumped into the evaporator by the circulation pump, and is absorbed by the lithium bromide concentrated solution in the absorber after being vaporized; after becoming a dilute solution, it is pumped into the low-pressure generator through the first heat exchanger by the solution pump, and is converted into a high-temperature dilute solution after being heated in the low-pressure generator, and enters the high-pressure generator through the second heat exchanger and the third heat exchanger respectively; the concentrated solution is further concentrated after passing through the second heat exchanger and releasing excess water vapor in the gas-liquid separator, and then enters the absorber after being cooled by the first heat exchanger, realizing self-spraying and vertical rinsing, and completing the cycle.

[0020] The present invention realizes the advantages of traditional absorption refrigerants in terms of energy utilization efficiency, combines the water pipes of the evaporator and the subcooler in parallel operation; realizes internal energy ladder cooling through the heat exchanger, increases the unit cooling capacity through the subcooler, and finally utilizes heat recovery to improve the overall energy efficiency.

[0021] The medium-temperature heat is supplied to the absorber and condenser, where the temperature can be raised by about 20°C, and then supplied to the user's air-conditioning heat exchanger for heating, which greatly improves the utilization rate of the system.

[0022] In the unit, the heat of the concentrated solution can be transferred to the dilute solution through three sets of heat exchangers, which not only reduces the equipment investment required for cooling, but also reduces the heat consumption of heating the dilute solution. Therefore, compared with traditional lithium bromide units, the energy utilization efficiency of refrigeration in summer can be improved through energy cascade utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the structure of the present invention.

[0024] In the figure, A is a high-pressure generator, B is a gas-liquid separator, C is a user-side heat exchanger, D is a low-pressure generator, E is a condenser, F is an evaporator, G is a subcooler, H is an absorber, I is a subcooling device, J is a cooling tower, K is a liquid storage tank, L is a first heat exchanger, M is a second heat exchanger, and N is a third heat exchanger;

[0025] 1 is the first valve, 2 is the second valve, 3 is the third valve, 4 is the fourth valve, 5 is the fifth valve, 6 is the sixth valve, 7 is the seventh valve, and 8 is the eighth valve. DETAILED DESCRIPTION

[0026] The present invention will be further described below by means of specific embodiments in conjunction with the accompanying drawings:

[0027] In this embodiment, refer to Figure 1 The high-efficiency absorption heat pump includes a cooling tower J, a condenser E, an evaporator F, an absorber H and a solution heat exchanger. The evaporator F is connected to a user-side heat exchanger C, and the condenser E is connected to the absorber H and the cooling tower J; it also includes a high-pressure generator A, a gas-liquid separator B, a low-pressure generator D, a subcooler G and a liquid reservoir K. The outlets of the evaporator F, the subcooler G and the subcooling coil are respectively connected to the inlet of the liquid reservoir H, and the liquid outlet of the liquid reservoir H is respectively connected to the water collecting pan of the evaporator F and the subcooler G, so that a liquid circulation structure is formed between the evaporator F, the subcooler G and the liquid reservoir K; the liquid outlet pipe of the absorber H is connected to the low-pressure generator D, and the high-pressure generator A forms a gas-liquid separation structure and a liquid circulation structure with the solution heat exchanger and the gas-liquid separator B.

[0028] The solution heat exchanger includes a first heat exchanger L, a second heat exchanger M and a third heat exchanger N. The concentrated solution outlet of the high-pressure generator A is connected to the gas-liquid separator B through the second heat exchanger M. The gas outlet pipe of the gas-liquid separator B is connected back to the high-pressure generator A. The liquid outlet pipe of the gas-liquid separator B is connected to the absorber H through the first heat exchanger L. The second heat exchanger M is also connected to the high-pressure generator A through the third heat exchanger N.

[0029] It also includes a subcooling device I, the refrigerant outlet pipeline of the condenser E is connected to the subcooling device I, the outlet of the subcooling device I is connected to the inlet of the liquid reservoir K, the liquid outlet of the liquid reservoir K is connected to the water collecting pan of the evaporator F, the subcooler G and the subcooling device I through a refrigerant circulation pump, so that the subcooling pipeline forms a closed loop through the subcooling device I, the liquid reservoir K and the subcooler G.

[0030] The liquid outlet pipe of the absorber H is connected to the low-pressure generator D through a refrigerant circulation pump.

[0031] The liquid outlet pipeline of the high-pressure generator A and the liquid outlet pipeline of the gas-liquid separator B are connected to the second heat exchanger M and the first heat exchanger L respectively.

[0032] A first valve 1 is provided in the connecting pipeline between the refrigerant outlet pipeline of the liquid reservoir K and the evaporator F, and a solution pump is connected in parallel at both ends of the first valve 1; a second valve 2 is provided in the connecting pipeline between the refrigerant outlet pipeline of the liquid reservoir K and the subcooler G, and a solution pump is connected in parallel at both ends of the second valve 2.

[0033] A third valve 3 and a solution pump are provided between the concentrated solution outlet of the high pressure generator A and the absorber H.

[0034] A fourth valve 4 is provided in the connecting pipeline between the cooling water outlet pipeline of the cooling tower J and the inlet of the absorber H, and a connecting pipeline is provided between the dilute solution outlet pipeline of the absorber H and the inlet of the gas-liquid separator B.

[0035] The inlet of the absorber H is provided with a fifth valve 5, and the outlet of the condenser E is provided with a sixth valve 6, so as to form a switching structure for realizing heat recovery.

[0036] A seventh valve 7 is provided in the connecting pipeline between the refrigerant outlet pipeline of the liquid storage tank K and the supercooling device I.

[0037] Single refrigeration condition: open the first valve 1, the third valve 3, the fourth valve 4, and the eighth valve 8, and close the second valve 2, the fifth valve 5, the sixth valve 6, and the seventh valve 7.

[0038] An external high-temperature heat source is used to provide heat to the high-pressure generator A to vaporize the water in the solution. The water enters the condenser E and is cooled. It is then cooled again through the cooling device I. It is then throttled and depressurized by the first valve 1 and flows into the evaporator F before being sprayed on the chilled water supply pipe. It is then collected through the water tray and enters the liquid reservoir K, and is pumped into the evaporator F by the circulating pump. After vaporization, it is absorbed by the lithium bromide concentrated solution in the absorber H, and after becoming a dilute solution, it is pumped into the low-pressure generator D through the first heat exchanger L by the solution pump. After being heated in the low-pressure generator D, it is converted into a high-temperature dilute solution, and enters the high-pressure generator A through the second heat exchanger M and the third heat exchanger N respectively. The concentrated solution is further concentrated after passing through the second heat exchanger M and releasing excess water vapor in the gas-liquid separator B, and then enters the absorber H after being cooled by the first heat exchanger L, realizing self-spraying and completing the cycle.

[0039] Subcooling refrigeration condition: open the first valve 1, the second valve 2, the third valve 3, the fourth valve 4, the seventh valve 7, the eighth valve 8, and close the fifth valve 5 and the sixth valve 6.

[0040] An external high-temperature heat source is used to provide heat to the high-pressure generator A to vaporize the water in the solution. The water enters the condenser E and is cooled, and then is cooled again through the cooling device I. Then, after throttling and reducing the pressure through the first valve 1, it flows into the liquid reservoir K, and then is sprayed on the chilled water supply pipe of the evaporator F and the supercooling water pipe of the supercooler G through the circulating pump, and is collected through the water tray and enters the liquid reservoir K. It is then pumped into the evaporator F by the circulating pump, and after being vaporized, it is absorbed by the lithium bromide concentrated solution in the absorber H, and after becoming a dilute solution, it is pumped into the low-pressure generator D through the first heat exchanger L by the solution pump. After being heated in the low-pressure generator D, it is converted into a high-temperature dilute solution, and enters the high-pressure generator A through the second heat exchanger M and the third heat exchanger N respectively. The concentrated solution is further concentrated after passing through the second heat exchanger M and releasing excess water vapor in the gas-liquid separator B, and then enters the absorber H after being cooled by the first heat exchanger L, realizing self-spraying and completing the cycle.

[0041] Simultaneous cooling and heating conditions: open the first valve 1, the second valve 2, the third valve 3, the fifth valve 5, the sixth valve 6, the seventh valve 7, the eighth valve 8, and close the fourth valve 4.

[0042] The external high-temperature heat source is used to provide heat to the high-pressure generator A to vaporize the water in the solution. The water enters the condenser E and is cooled, and then is cooled again through the cooling device, and then throttled and depressurized by the first valve 1 and flows into the liquid reservoir K. It is sprayed on the chilled water supply pipe of the evaporator F and the supercooled water pipe of the subcooler G by the circulating pump, and then collected by the water tray and enters the liquid reservoir K, and then pumped into the evaporator F by the circulating pump. After vaporization, it is absorbed by the lithium bromide concentrated solution in the absorber H. After becoming a dilute solution, it enters the low-pressure generator D through the solution pump through the first heat exchanger L, and is converted into a high-temperature dilute solution after being heated by the low-pressure generator D, and enters the high-pressure generator A through the second heat exchanger M and the third heat exchanger N respectively. The concentrated solution is further concentrated after passing through the second heat exchanger M and releasing excess water vapor in the gas-liquid separator B, and then enters the absorber H after being cooled by the first heat exchanger L, realizing self-spraying and vertical rinsing, and completing the cycle; the cooling water side is heated by the absorber H and condenser E to supply to users.

[0043] In this way, the water pipelines of the evaporator F and the subcooler G are connected in parallel to operate; internal energy step cooling is achieved through each heat exchanger, the unit cooling capacity is increased through the subcooler G, and finally heat recovery is used to improve the overall energy efficiency.

[0044] The present invention has been described in detail above. The above description is only a preferred embodiment of the present invention and should not limit the scope of implementation of the present application. That is, all equivalent changes and modifications made within the scope of the present application should still fall within the scope of the present invention.

Claims

1. A high-efficiency absorption heat pump, comprising a cooling tower, a condenser, an evaporator, an absorber and a solution heat exchanger, wherein the evaporator is connected to a user-side heat exchanger, and the condenser is connected to the absorber and the cooling tower, characterized in that: It also includes a high-pressure generator, a gas-liquid separator, a low-pressure generator, a subcooler and a liquid reservoir. The outlets of the evaporator and the subcooler are respectively connected to the inlet of the liquid reservoir, and the liquid outlet of the liquid reservoir is respectively connected to the water collecting pan of the evaporator and the subcooler, so that a liquid circulation structure is formed between the evaporator, the subcooler and the liquid reservoir; the liquid outlet pipe of the absorber is connected to the low-pressure generator, and the high-pressure generator forms a gas-liquid separation structure and a liquid circulation structure with the solution heat exchanger and the gas-liquid separator.

2. The high-efficiency absorption heat pump according to claim 1, characterized in that: The solution heat exchanger includes a first heat exchanger, a second heat exchanger and a third heat exchanger. The concentrated solution outlet of the high-pressure generator is connected to the gas-liquid separator through the second heat exchanger. The gas outlet pipe of the gas-liquid separator is connected back to the high-pressure generator. The liquid outlet pipe of the gas-liquid separator is connected to the absorber through the first heat exchanger. The second heat exchanger is also connected to the high-pressure generator through the third heat exchanger.

3. The high-efficiency absorption heat pump according to claim 2, characterized in that: It also includes a subcooling device, the refrigerant outlet pipeline of the condenser is connected to the subcooling device, the outlet of the subcooling device is connected to the inlet of the liquid storage device, and the liquid outlet of the liquid storage device is connected to the water collecting pan of the evaporator, the subcooler and the subcooling device through a refrigerant circulation pump, so that the subcooling pipeline forms a closed loop through the subcooling device, the liquid storage device and the subcooler.

4. The high-efficiency absorption heat pump according to claim 3, characterized in that: The liquid outlet pipe of the absorber is connected to the low-pressure generator through a refrigerant circulation pump.

5. The high-efficiency absorption heat pump according to claim 3, characterized in that: The liquid outlet pipeline of the high-pressure generator and the liquid outlet pipeline of the gas-liquid separator are respectively connected to the second heat exchanger and the first heat exchanger.

6. The high-efficiency absorption heat pump according to claim 5, characterized in that: A first valve is provided in the connection pipeline between the refrigerant outlet pipeline of the liquid storage device and the evaporator, and a solution pump is connected in parallel at both ends of the first valve; a second valve is provided in the connection pipeline between the refrigerant outlet pipeline of the liquid storage device and the supercooler, and a solution pump is connected in parallel at both ends of the second valve.

7. The high-efficiency absorption heat pump according to claim 6, characterized in that: A third valve and a solution pump are provided between the concentrated solution outlet of the high pressure generator and the absorber.

8. The high-efficiency absorption heat pump according to claim 7, characterized in that: A fourth valve is arranged in the connecting pipeline between the cooling water outlet pipeline of the cooling tower and the absorber inlet, and a connecting pipeline is arranged between the dilute solution outlet pipeline of the absorber and the gas-liquid separator inlet.

9. The high-efficiency absorption heat pump according to claim 8, characterized in that: A fifth valve is provided at the inlet of the absorber, and a sixth valve is provided at the outlet of the condenser to form a switching structure for realizing heat recovery; a seventh valve is provided in the connecting pipeline between the refrigerant outlet pipeline of the liquid storage device and the supercooling device.

10. The high-efficiency absorption heat pump according to claim 9, characterized in that: It includes single cooling condition, supercooling cooling condition and simultaneous cooling and heating condition, among which, Under the single refrigeration condition, open the first valve, the third valve, the fourth valve, and the eighth valve, and close the second valve, the fifth valve, the sixth valve, and the seventh valve. Use the external high-temperature heat source to provide heat to the high-pressure generator to vaporize the water in the solution. The water enters the condenser and is cooled, and then is cooled again through the cooling device. After throttling and reducing the pressure, it flows into the evaporator and is sprayed on the chilled water supply pipe; it is then collected through the water tray and enters the liquid storage device, and is pumped into the evaporator by the circulation pump. After vaporization, it is absorbed by the lithium bromide concentrated solution in the absorber, and after becoming a dilute solution, it is pumped into the low-pressure generator through the first heat exchanger by the solution pump; after being heated in the low-pressure generator, it is converted into a high-temperature dilute solution, and enters the high-pressure generator through the second heat exchanger and the third heat exchanger respectively. The concentrated solution is further concentrated after passing through the second heat exchanger and releasing excess water vapor in the gas-liquid separator, and then enters the absorber after being cooled by the first heat exchanger, realizing self-spraying and completing the cycle; Under the supercooling refrigeration condition, open the first valve, the second valve, the third valve, the fourth valve, the seventh valve, and the eighth valve, close the fifth valve and the sixth valve, use the external high-temperature heat source to provide heat to the high-pressure generator to vaporize the water in the solution, the water enters the condenser to be cooled, and then passes through the cooling device to be cooled again; then after throttling and reducing the pressure through the first valve, it flows into the liquid reservoir, and then is sprayed on the evaporator chilled water supply pipe and the supercooler supercooling water pipe through the circulation pump, and is collected through the water tray and enters the liquid reservoir; it is then pumped into the evaporator by the circulation pump, and after being vaporized, it is absorbed by the lithium bromide concentrated solution in the absorber, and after becoming a dilute solution, it is passed through the first heat exchanger by the solution pump to enter the low-pressure generator; after being heated in the low-pressure generator, it is converted into a high-temperature dilute solution, and enters the high-pressure generator through the second heat exchanger and the third heat exchanger respectively; the concentrated solution passes through the second heat exchanger and is further concentrated after releasing excess water vapor in the gas-liquid separator, and then enters the absorber after being cooled by the first heat exchanger, realizing self-spraying and completing the cycle; At the same time, under the cooling and heating conditions, the first valve, the second valve, the third valve, the fifth valve, the sixth valve, the seventh valve, and the eighth valve are opened, and the fourth valve is closed. The external high-temperature heat source is used to provide heat to the high-pressure generator to vaporize the water in the solution. The water enters the condenser and is cooled, and then is cooled again through the cooling device, and then throttled and reduced in pressure by the first valve into the liquid reservoir; it is sprayed on the evaporator chilled water supply pipe and the supercooler supercooling water pipe through the circulation pump, and then collected through the water tray into the liquid reservoir, and then pumped into the evaporator by the circulation pump, and is absorbed by the lithium bromide concentrated solution in the absorber after being vaporized; after becoming a dilute solution, it is pumped into the low-pressure generator through the first heat exchanger by the solution pump, and is converted into a high-temperature dilute solution after being heated in the low-pressure generator, and enters the high-pressure generator through the second heat exchanger and the third heat exchanger respectively; the concentrated solution is further concentrated after passing through the second heat exchanger and releasing excess water vapor in the gas-liquid separator, and then enters the absorber after being cooled by the first heat exchanger, realizing self-spraying and vertical rinsing, and completing the cycle.

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