Continuous absorption heat pump based on gas phase, liquid phase and solid phase

Abstract

The invention relates to the technical field of medium-low-grade heat energy utilization, absorption heat pumps and distributed combined cooling and heating, and discloses a continuous absorption heat pump based on gas, liquid and solid phases. Comprising an evaporator (1), a desorption-absorber (2), a desorption-absorber (3), a condenser (4), a valve (5), a mixing valve (15), an external chilled water loop (16), a circulating water passage (17), a cooling water loop (18), an external circulating water loop (19), an external circulating water loop (20), a circulating water passage (21), a circulating water passage (22), a circulating water passage (23), a circulating water passage (24), a porous matrix carrier (25) and a porous matrix carrier (26). The driving heat source utilization range can be widened, large-temperature-span heat supply is achieved, the energy utilization efficiency is improved, and the heat supply amount of the system is increased.

Description

Technical Field

[0001] This invention relates to the fields of low-grade heat energy utilization, absorption heat pumps, and distributed combined cooling and heating technologies, and particularly to a continuous absorption heat pump based on a gas-liquid-solid three-phase system. Background Technology

[0002] As people's demands for quality of life continue to rise, building heating and cooling systems, as one of the fundamental measures to ensure people's comfort, are expected to see their energy consumption increase year by year. Under the backdrop of "carbon neutrality," traditional coal-fired boiler centralized heating and electric-driven cooling methods urgently need transformation due to their low efficiency and high energy consumption. Optimizing the energy structure and increasing the proportion of clean energy has become an important measure for my country. Meanwhile, my country has abundant low- and medium-grade thermal energy resources such as solar thermal energy, waste heat, and geothermal energy, but currently faces many problems such as difficulties in recovery and utilization. Therefore, the efficient recovery and utilization of low- and medium-grade thermal energy for building heating and cooling is of great significance.

[0003] Currently, distributed combined cooling, heating, and power (CCHP) mainly employs vapor compression systems, driven by high-grade electricity. This single energy utilization method makes it difficult to absorb the intermittent, unstable, and spatiotemporally mismatched distributed clean and renewable energy sources. Absorption heat pump technology, driven by medium- to low-grade heat energy, improves heat utilization efficiency and increases heating capacity, making it a crucial method for realizing distributed CCHP. However, the concentration range of its commonly used salt solution working fluid is limited by crystallization issues, resulting in limited improvements in system energy efficiency.

[0004] The above content is only used to help understand the technical solution of the present invention and does not represent an admission that the above content is prior art. Summary of the Invention

[0005] The main objective of this invention is to provide a continuous absorption heat pump based on a gas-liquid-solid three-phase system, aiming to break through the bottleneck in improving the energy efficiency of existing absorption heat pumps.

[0006] To achieve the above objectives, the present invention provides a continuous absorption heat pump based on a gas-liquid-solid three-phase system, wherein the continuous absorption heat pump based on a gas-liquid-solid three-phase system comprises:

[0007] Evaporator (1), Desorption-Absorber (2), Desorption-Absorber (3), Condenser (4), Valve (5), Valve (6), Valve (7), Valve (8), Expansion Valve (9), Valve (10), Valve (11), Valve (12), Valve (13), Mixing Valve (14), Mixing Valve (15), External Chilled Water Circuit (16), Circulating Water Circuit (17), Cooling Water Circuit (18), External Circulating Water Circuit (19), External Circulating Water Circuit (20), Circulating Water Circuit (21), Circulating Water Circuit (22), Circulating Water Circuit (23), Circulating Water Circuit (24), Porous Matrix Carrier (25), Porous Matrix Carrier (26);

[0008] The evaporator (1) has its liquid absorbent inlet connected to the liquid absorbent outlet of the condenser (4) via an expansion valve (9), and its gaseous absorbent outlet connected to the gaseous absorbent inlet of the desorption-absorber (2) via a valve (5) and to the gaseous absorbent inlet of the desorption-absorber (3) via a valve (6). Its heat exchange interface is connected to the external chilled water circuit (16).

[0009] The desorption-absorber (2) has a porous matrix carrier (25) fixedly installed inside. Its gaseous absorbent outlet is connected to the gaseous absorbent inlet of the condenser (4) through a valve (7). Its external heating interface is connected to the external circulating water circuit (19). The outlet of the external circulating water circuit (19) is equipped with a valve (10), and its circulating water inlet is connected to the mixing valve (14) through the circulating water passage (23).

[0010] The desorption-absorber (3) has a porous matrix carrier (26) fixedly installed inside. Its gaseous absorbent outlet is connected to the gaseous absorbent inlet of the condenser (4) through a valve (8). Its external heating interface is connected to the external circulating water circuit (20). The outlet of the external circulating water circuit (20) is equipped with a valve (11), and its circulating water inlet is connected to the mixing valve (15) through the circulating water passage (24).

[0011] The condenser (4) has a circulating water passage (17) and a cooling water circuit (18) running through it. One end of the circulating water passage (17) is connected to a mixing valve (14) and the other end is connected to a mixing valve (15). The two ends of the cooling water circuit (18) are respectively connected to an external cooling water supply end and a discharge end to assist in condensing gaseous absorption of the substance.

[0012] The mixing valve (14) is also connected to the circulating water passage (21) and the circulating water passage (23), respectively, and the other end of the circulating water passage (21) is connected to the external circulating water.

[0013] The mixing valve (15) is also connected to the circulating water passage (22) and the circulating water passage (24) respectively. The other end of the circulating water passage (22) is connected to the external circulating water. A valve (13) is installed at the inlet end of the circulating water passage (24) and a valve (12) is installed at the inlet end of the circulating water passage (23).

[0014] Furthermore, the continuous absorption heat pump also includes: an auxiliary compressor (27) and an auxiliary compressor (28);

[0015] The auxiliary compressor (27) is installed in the pipeline between the valve (7) and the gaseous absorbent inlet of the condenser (4);

[0016] The auxiliary compressor (28) is a pipeline located between the valve (8) and the gaseous absorbent inlet of the condenser (4).

[0017] Furthermore, the continuous absorption heat pump also includes: an auxiliary compressor (29) and an auxiliary compressor (30);

[0018] An auxiliary compressor (29) is installed in the pipeline between the valve (5) and the gaseous absorbent inlet of the desorption-absorber (2);

[0019] The auxiliary compressor (30) is located in the pipeline between the valve (6) and the gaseous absorbent inlet of the desorption-absorber (3).

[0020] Furthermore, the continuous absorption heat pump also includes: the regenerator (31) is provided with three flow channels, the middle channel is a liquid absorbent channel, and the two side channels are gaseous absorbent channels;

[0021] The intermediate channel is a pipeline located between the liquid absorbent outlet of the condenser (4) and the expansion valve (9);

[0022] The two channels are provided, wherein one channel is a pipeline between the valve (5) and the gaseous absorbent inlet of the desorption-absorber (2); and the other channel is a pipeline between the valve (6) and the gaseous absorbent inlet of the desorption-absorber (3).

[0023] Furthermore, the continuous absorption heat pump also includes: a solution pump (32) and an internal circulating water circuit (33);

[0024] The solution pump (32) is connected in series in the internal circulating water circuit (33) to provide power for the internal circulating water;

[0025] Internal circulating water circuit (33): One end is connected to the heat exchange port of the desorption-absorber (2), and the other end is connected to the heat exchange port of the desorption-absorber (3).

[0026] Furthermore, the continuous absorption heat pump also includes: valve (34), valve (35), valve (36), valve (37), flash tank (38), flash tank (39), high temperature steam passage (40), high temperature steam passage (41), flash liquid passage (42), and flash liquid passage (43);

[0027] The valve (34) is connected in series to the inlet end of the external circulating water circuit (19);

[0028] The valve (35) is connected in series to the inlet end of the external circulating water circuit (20);

[0029] The inlet of the flash tank (38) is connected to the outlet of the external circulating water circuit (19) through the valve (36), its gaseous outlet is connected to the high temperature steam passage (40), and its liquid outlet is connected to the flash liquid passage (42).

[0030] The inlet of the flash tank (39) is connected to the outlet of the external circulating water circuit (20) through the valve (37), its gaseous outlet is connected to the high-temperature steam passage (41), and its liquid outlet is connected to the flash liquid passage (43).

[0031] Furthermore, the continuous absorption heat pump includes p desorption-absorbers as desorbers and q desorption-absorbers as absorbers, where p and q are positive integers greater than 0.

[0032] Furthermore, the continuous absorption heat pump based on gas-liquid-solid three-phase includes: evaporator (1), desorption-absorber (2), desorption-absorber (3), condenser (4), valve (5), valve (6), valve (7), valve (8), expansion valve (9), valve (10), valve (11), valve (12), valve (13), mixing valve (14), mixing valve (15), external chilled water circuit (16), circulating water passage (17), cooling water circuit (18), external circulating water circuit (19), external circulating water circuit (20), circulating water passage (21), circulating water passage (22), circulating water passage (23), circulating water passage (24), microcapsule (42), microcapsule (43);

[0033] The microcapsule (42) encapsulates a salt solution and is fixedly placed inside the desorption-absorber (2), with its heat exchange surface in contact with the pipeline of the external circulating water circuit (19);

[0034] The microcapsule (43) contains a salt solution and is fixed inside the desorption-absorber (3), with its heat exchange surface in contact with the pipeline of the external circulating water circuit (20).

[0035] Furthermore, the continuous absorption heat pump based on gas-liquid-solid three-phase includes: evaporator (1), desorption-absorber (2), desorption-absorber (3), condenser (4), valve (5), valve (6), valve (7), valve (8), expansion valve (9), valve (10), valve (11), valve (12), valve (13), mixing valve (14), mixing valve (15), external chilled water circuit (16), circulating water passage (17), cooling water circuit (18), external circulating water circuit (19), external circulating water circuit (20), circulating water passage (21), circulating water passage (22), circulating water passage (23), circulating water passage (24), solution pump (44), solution pump (45), absorbent screen (46), absorbent screen (47);

[0036] The desorption-absorber (2) has a salt solution chamber at the bottom and a spray port at the top. The inlet of the solution pump (44) is connected to the outlet of the salt solution chamber, and the outlet of the solution pump (44) is connected to the spray port. The spray port is directly opposite the coil of the external circulating water circuit (19). The absorbent screen (46) is fixedly installed inside the desorption-absorber (2) above the salt solution chamber to collect the crystalline salt precipitated from the salt solution.

[0037] The desorption-absorber (3) has a salt solution chamber at the bottom and a spray port at the top. The inlet of the solution pump (45) is connected to the outlet of the salt solution chamber, and the outlet of the solution pump (45) is connected to the spray port. The spray port is directly opposite the coil of the external circulating water circuit (20). The absorbent screen (47) is fixedly installed inside the desorption-absorber (3) below the gaseous absorbent inlet to carry anhydrous salt.

[0038] This invention provides a continuous absorption heat pump based on a gas-liquid-solid three-phase system. The continuous absorption heat pump includes: an evaporator (1), a desorption-absorber (2), a desorption-absorber (3), a condenser (4), valves (5), (6), (7), (8), an expansion valve (9), (10), (11), (12), (13), a mixing valve (14), a mixing valve (15), an external chilled water circuit (16), a circulating water passage (17), a cooling water circuit (18), an external circulating water circuit (19), an external circulating water circuit (20), a circulating water passage (21), a circulating water passage (22), and a circulating water... The system includes a passageway (23), a circulating water passageway (24), a porous matrix carrier (25), and a porous matrix carrier (26). The evaporator (1) has its liquid absorbent inlet connected to the liquid absorbent outlet of the condenser (4) via an expansion valve (9), and its gaseous absorbent outlet connected to the gaseous absorbent inlet of the desorption-absorber (2) via valve (5) and to the gaseous absorbent inlet of the desorption-absorber (3) via valve (6). Its heat exchange interface is connected to an external chilled water circuit (16). The desorption-absorber (2) has a porous matrix carrier (25) fixedly installed inside, and its gaseous absorbent outlet connected to the gaseous absorbent inlet of the condenser (4) via valve (7). Externally, it is equipped with... A heat interface is connected to an external circulating water circuit (19). A valve (10) is installed at the outlet of the external circulating water circuit (19), and its circulating water inlet is connected to a mixing valve (14) through a circulating water passage (23). The desorption-absorber (3) has a porous matrix carrier (26) fixedly installed inside. Its gaseous absorbent outlet is connected to the gaseous absorbent inlet of the condenser (4) through a valve (8). Its external heating interface is connected to an external circulating water circuit (20). A valve (11) is installed at the outlet of the external circulating water circuit (20), and its circulating water inlet is connected to a mixing valve (15) through a circulating water passage (24). The condenser (4) has a circulating water passage (17) and a cooling water circuit (14) running through it. 18), one end of the circulating water passage (17) is connected to the mixing valve (14) and the other end is connected to the mixing valve (15). The two ends of the cooling water circuit (18) are respectively connected to the external cooling water supply end and the discharge end, which are used to assist in condensing gaseous absorption of the substance. The mixing valve (14) is also connected to the circulating water passage (21) and the circulating water passage (23). The other end of the circulating water passage (21) is connected to the external circulating water. The mixing valve (15) is also connected to the circulating water passage (22) and the circulating water passage (24). The other end of the circulating water passage (22) is connected to the external circulating water. A valve (13) is installed at the inlet end of the circulating water passage (24), and a valve (12) is installed at the inlet end of the circulating water passage (23).This invention's absorption heat pump uses a salt solution-water as the circulating working fluid. It employs a porous matrix carrier, microcapsule structure, and absorbent sieve design to overcome the limitations of the liquid phase crystallization line. Through solid phase crystallization, it widens the solution concentration glide. Furthermore, the external circulating water undergoes two temperature rises in the absorber and condenser, thereby increasing the heat output and reducing system temperature under the same system scale. The system employs a dual-bed structure design with a desorber-absorber, achieving synchronous interconnection between the desorber and condenser, and between the absorber and evaporator, allowing desorption and absorption processes to occur simultaneously. This design ensures long-term, uninterrupted continuous operation while meeting heating and cooling demands. Furthermore, to broaden the range of heat source utilization and achieve large-temperature-span heating, an auxiliary compressor is used to enhance both the desorption and absorption processes. To improve energy efficiency and increase system heating capacity, regenerative heating and internal heat recovery are employed. To broaden system application scenarios and ensure flexibility in heating and cooling, multiple desorbers / absorbers are connected in parallel, and a flash tank is introduced into the system. Through cyclic optimization design and adjustments to system operation strategies, the system can operate efficiently, stably, and continuously for extended periods under different application scenarios. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the first structure of an embodiment of the continuous absorption heat pump based on a gas-liquid-solid three-phase system of the present invention.

[0040] Figure 2 This is a schematic diagram of the second structure of an embodiment of the continuous absorption heat pump based on a gas-liquid-solid three-phase system of the present invention.

[0041] Figure 3 This is a schematic diagram of the third structure of an embodiment of the continuous absorption heat pump based on a gas-liquid-solid three-phase system of the present invention.

[0042] Figure 4 This is a schematic diagram of the fourth structure of an embodiment of the continuous absorption heat pump based on a gas-liquid-solid three-phase system of the present invention.

[0043] Figure 5 This is a fifth structural schematic diagram of an embodiment of the continuous absorption heat pump based on a gas-liquid-solid three-phase system of the present invention;

[0044] Figure 6 This is a sixth structural schematic diagram of an embodiment of the continuous absorption heat pump based on a gas-liquid-solid three-phase system of the present invention.

[0045] Figure 7 This is a seventh structural schematic diagram of an embodiment of the continuous absorption heat pump based on a gas-liquid-solid three-phase system of the present invention.

[0046] Figure 8 This is a schematic diagram of the eighth structure of an embodiment of the continuous absorption heat pump based on a gas-liquid-solid three-phase system of the present invention.

[0047] Figure 9 This is a ninth structural schematic diagram of an embodiment of the continuous absorption heat pump based on a gas-liquid-solid three-phase system of the present invention.

[0048] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0049] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0050] like Figure 1 As shown, Figure 1 This is a schematic diagram of the first structure of the continuous absorption heat pump based on a gas-liquid-solid three-phase system according to the present invention. The continuous absorption heat pump based on a gas-liquid-solid three-phase system includes:

[0051] Evaporator (1), Desorption-Absorber (2), Desorption-Absorber (3), Condenser (4), Valve (5), Valve (6), Valve (7), Valve (8), Expansion Valve (9), Valve (10), Valve (11), Valve (12), Valve (13), Mixing Valve (14), Mixing Valve (15), External Chilled Water Circuit (16), Circulating Water Circuit (17), Cooling Water Circuit (18), External Circulating Water Circuit (19), External Circulating Water Circuit (20), Circulating Water Circuit (21), Circulating Water Circuit (22), Circulating Water Circuit (23), Circulating Water Circuit (24), Porous Matrix Carrier (25), Porous Matrix Carrier (26);

[0052] The evaporator (1) has its liquid absorbent inlet connected to the liquid absorbent outlet of the condenser (4) via an expansion valve (9), and its gaseous absorbent outlet connected to the gaseous absorbent inlet of the desorption-absorber (2) via a valve (5) and to the gaseous absorbent inlet of the desorption-absorber (3) via a valve (6). Its heat exchange interface is connected to the external chilled water circuit (16).

[0053] The desorption-absorber (2) has a porous matrix carrier (25) fixedly installed inside. Its gaseous absorbent outlet is connected to the gaseous absorbent inlet of the condenser (4) through a valve (7). Its external heating interface is connected to the external circulating water circuit (19). The outlet of the external circulating water circuit (19) is equipped with a valve (10), and its circulating water inlet is connected to the mixing valve (14) through the circulating water passage (23).

[0054] The desorption-absorber (3) has a porous matrix carrier (26) fixedly installed inside. Its gaseous absorbent outlet is connected to the gaseous absorbent inlet of the condenser (4) through a valve (8). Its external heating interface is connected to the external circulating water circuit (20). The outlet of the external circulating water circuit (20) is equipped with a valve (11), and its circulating water inlet is connected to the mixing valve (15) through the circulating water passage (24).

[0055] The condenser (4) has a circulating water passage (17) and a cooling water circuit (18) running through it. One end of the circulating water passage (17) is connected to a mixing valve (14) and the other end is connected to a mixing valve (15). The two ends of the cooling water circuit (18) are respectively connected to an external cooling water supply end and a discharge end to assist in condensing gaseous absorption of the substance.

[0056] The mixing valve (14) is also connected to the circulating water passage (21) and the circulating water passage (23), respectively, and the other end of the circulating water passage (21) is connected to the external circulating water.

[0057] The mixing valve (15) is also connected to the circulating water passage (22) and the circulating water passage (24) respectively. The other end of the circulating water passage (22) is connected to the external circulating water. A valve (13) is installed at the inlet end of the circulating water passage (24) and a valve (12) is installed at the inlet end of the circulating water passage (23).

[0058] When the desorption-absorber 2 functions as a desorber, the desorption-absorber 3 functions as an absorber. Valves 5, 8, 11, and 12 are closed, while valves 6, 7, 10, 13, and expansion valve 9 are open. Mixing valve 14 connects circulating water passage 17 and circulating water passage 21, and mixing valve 15 connects circulating water passage 17 and circulating water passage 24. The external circulating water circuit 19 heats the salt solution in the porous matrix carrier 25 and then flows out through valve 10. The salt solution in the desorption-absorber 2 undergoes a desorption process, with its concentration continuously increasing until it is concentrated to a saturated state. Subsequently, crystalline salt precipitates out, and finally, it is dehydrated to an anhydrous salt state and adheres to the porous matrix carrier 25. The desorbed gaseous absorbent enters the condenser 4 through valve 7 and is completely condensed, releasing condensation heat. The resulting high-pressure liquid absorbent is depressurized by expansion valve 9 and then enters the evaporator. In evaporator 1, the gaseous absorbent is heated and evaporated into a gaseous absorbent by external chilled water circuit 16. The desorption-absorber 3 acts as an absorber; the gaseous absorbent enters the desorption-absorber 3 through valve 6 and is absorbed and released heat by the anhydrous salt attached to the porous matrix carrier 26 inside. External circulating water enters circulating water circuit 17 through circulating water passage 21 and mixing valve 14, absorbs condensation heat to complete the first temperature rise, and then enters external circulating water circuit 20 through mixing valve 15, circulating water passage 24, and valve 13. After absorbing heat in the desorption-absorber 3 to complete the second temperature rise, it flows out for heating. The salt solution in the porous matrix carrier 25 is concentrated into anhydrous salt. When the anhydrous salt in the porous matrix carrier 26 absorbs the gaseous absorbent to the same concentration as the initial salt solution in the desorption-absorber 2, the functions of the desorption-absorber 2 and desorption-absorber 3 are interchanged.

[0059] When the desorption-absorber 3 functions as a desorber, the desorption-absorber 2 functions as an absorber. Valves 6, 7, 10, and 13 are closed, while valves 5, 8, 11, 12, and expansion valve 9 are open. Mixing valve 14 connects circulating water passage 17 and circulating water passage 23, and mixing valve 15 connects circulating water passage 17 and circulating water passage 22. The external circulating water circuit 20 heats the salt solution in the porous matrix carrier 26 and then flows out through valve 11. The salt solution in the desorption-absorber 3 undergoes a desorption process, with its concentration continuously increasing until it is concentrated to a saturated state. Subsequently, crystalline salt precipitates out, and finally, it is dehydrated to an anhydrous salt state and adheres to the porous matrix carrier 26. The desorbed gaseous absorbent enters the condenser 4 through valve 8 and is completely condensed, releasing condensation heat. The resulting high-pressure liquid absorbent is depressurized by expansion valve 9 and then enters the evaporator 1. In step 1, the gaseous absorbent is heated and evaporated into a gaseous state by the external chilled water circuit 16. The desorption-absorber 2 acts as an absorber. After the gaseous absorbent enters the desorption-absorber 2 through valve 5, it is absorbed and released heat by the anhydrous salt attached to the porous matrix carrier 25 inside. The external circulating water enters the circulating water circuit 17 through the circulating water passage 22 and the mixing valve 15. After absorbing the condensation heat and completing the first temperature rise, it enters the external circulating water circuit 19 through the mixing valve 14, the circulating water passage 23 and the valve 12. After absorbing the heat in the desorption-absorber 2 and completing the second temperature rise, it flows out for heating. The salt solution in the porous matrix carrier 26 is concentrated into anhydrous salt. When the anhydrous salt in the porous matrix carrier 25 absorbs the gaseous absorbent to the same concentration as the initial salt solution in the desorption-absorber 3, the functions of the desorption-absorber 3 and the desorption-absorber 2 are interchanged. This cycle repeats to achieve continuous heating.

[0060] The beneficial effects of this example are: 1. It extends the working fluid circulation within the system to a three-phase desorption and absorption state involving gas, liquid, and solid, while simultaneously recovering and utilizing condensation heat, significantly increasing the system's heating capacity; 2. The external circulating water undergoes two heating processes in the condenser and absorber, achieving cascaded temperature increases and reducing irreversible system losses; 3. The dual-bed design, with control valves ensuring communication between the desorber and condenser, and between the absorber and evaporator, allows for simultaneous desorption and absorption processes, ensuring continuous system operation and meeting the continuous heating needs of different users, such as district heating and domestic hot water; 4. The condenser and absorber can provide cascaded heating, while the evaporator can also provide cooling to the outside environment, achieving… 5. The two-part circulating water path in the condenser ensures complete liquefaction and condensation of the absorbent vapor, fully guaranteeing the stable operation of the system; 6. The use of a porous matrix carrier allows the salt solution to desorb to anhydrous salt, thus making the initial stage of the absorption process a gas-solid adsorption, which can increase the system's heating temperature and achieve large-span heating; 7. The heat-driven three-phase desorption / absorption system has no internal pumping equipment. The generated anhydrous salt adheres to the porous matrix carrier, resulting in a simple system structure and eliminating the need to consider pump and pipe blockage caused by crystallization; 8. It can be driven by different heat sources such as solar energy, industrial waste heat, and geothermal energy, broadening the utilization range of external driving heat sources.

[0061] In one embodiment, reference Figure 2 The continuous absorption heat pump further includes: an auxiliary compressor (27) and an auxiliary compressor (28); the auxiliary compressor (27) is installed in a pipeline between the valve (7) and the gaseous absorbent inlet of the condenser (4); the auxiliary compressor (28) is installed in a pipeline between the valve (8) and the gaseous absorbent inlet of the condenser (4).

[0062] In this embodiment, when the desorption-absorber 2 functions as a desorber, the desorption-absorber 3 functions as an absorber. Valves 5, 8, 11, 12, and the auxiliary compressor 28 are closed, while valves 6, 7, 10, 13, the auxiliary compressor 27, and the expansion valve 9 are open. The mixing valve 14 connects the circulating water passage 17 and the circulating water passage 21, and the mixing valve 15 connects the circulating water passage 17 and the circulating water passage 24. The auxiliary compressor 27 is positioned between valve 7 and the condenser 4, reducing the desorption pressure of the desorption-absorber 2 and increasing the condensation pressure of the condenser 4. The desorbed gaseous absorbent passes through valve 7, is pressurized by the auxiliary compressor 27, and enters the condenser 4. The released condensation heat is carried away by the circulating water passage 17. When the functions of the desorption-absorber 2 and the desorption-absorber 3 are interchanged, the operating principles of the auxiliary compressor 28 and the auxiliary compressor 27 are the same and will not be described further.

[0063] The beneficial effects of this example are: 1. By introducing an auxiliary compressor, the desorption pressure is reduced, and the system can operate at a lower driving temperature, thereby broadening the range of driving heat source utilization; 2. The auxiliary compressor can reduce the desorption pressure, thereby reducing the requirements for the driving heat source, and also increasing the condensing pressure, thus increasing the system's heat supply; 3. The power of the auxiliary compressor can be adjusted in real time according to the external heat source temperature to ensure that the desorption process can proceed stably and continuously, and improve the flexibility of energy utilization on the supply side.

[0064] In one embodiment, reference Figure 3 The continuous absorption heat pump further includes: an auxiliary compressor (29) and an auxiliary compressor (30); the auxiliary compressor (29) is installed in a pipeline between the valve (5) and the gaseous absorbent inlet of the desorption-absorber (2); the auxiliary compressor (30) is installed in a pipeline between the valve (6) and the gaseous absorbent inlet of the desorption-absorber (3).

[0065] Taking desorption-absorber 2 as the desorber and desorption-absorber 3 as the absorber as an example: the auxiliary compressor 30 is placed between valve 6 and desorption-absorber 3. The gaseous absorbent evaporated from evaporator 1 passes through valve 6 and is compressed by auxiliary compressor 30, increasing its pressure, and then enters desorption-generator 3 to undergo the absorption process. When desorption-absorber 3 acts as the desorber and desorption-absorber 2 acts as the generator, the function of auxiliary compressor 29 is similar to that of auxiliary compressor 30, and will not be described in detail here.

[0066] The beneficial effects of this embodiment are: 1. By introducing an auxiliary compressor, the evaporation pressure can be reduced, and the system's adaptability to low-temperature environments can be improved; 2. The auxiliary compressor can increase the absorption pressure of the absorber, thereby increasing the absorption temperature, enhancing the absorber's ability to heat the return water, and ultimately improving the heating quality.

[0067] In one embodiment, reference Figure 4 The continuous absorption heat pump further includes: the regenerator (31) is provided with three flow channels, the middle channel is a liquid absorbent channel, and the two side channels are gaseous absorbent channels; the middle channel is a pipeline between the liquid absorbent outlet of the condenser (4) and the expansion valve (9); the two side channels, one side channel is a pipeline between the valve (5) and the gaseous absorbent inlet of the desorption-absorber (2); the other side channel is a pipeline between the valve (6) and the gaseous absorbent inlet of the desorption-absorber (3).

[0068] It should be noted that in this embodiment, the regenerator 31 has three flow channels. The middle channel carries the condensed liquid absorbent, while the two side channels carry the gaseous absorbent. Taking the desorption-absorber 2 as the desorber and the desorption-absorber 3 as the absorber as an example: valves 5 and 8 are closed, while valves 6 and 7 are open. The liquid absorbent condensed in the condenser 4 and the gaseous absorbent that first absorbs heat from the evaporator 1 and evaporates, then passes through valve 6, complete the heat exchange in the regenerator 31. The temperature of the liquid absorbent decreases, while the temperature of the gaseous absorbent increases. Subsequently, the liquid absorbent is sprayed into the coil in the evaporator 1 after being depressurized by the throttling valve, accelerating the evaporation process, while the gaseous absorbent enters the desorption-absorber 2 for absorption. When the functions of the desorption-absorber 2 and the desorption-absorber 3 are interchanged, valves 6 and 7 are closed, while valves 5 and 8 are open. At this time, the gaseous absorbent enters the regenerator for heat exchange through valve 5. The function of the regenerator remains unchanged and will not be elaborated further here.

[0069] The beneficial effects of this embodiment are as follows: 1. The regenerator facilitates heat exchange between the condensed liquid absorbent and the evaporated gaseous absorbent, thereby achieving energy recovery and utilization and improving energy efficiency. 2. By heating the gaseous absorbent through the regenerator before it enters the absorber for absorption, the heating capacity of the absorber can be increased, thus improving the system's heating performance coefficient. 3. Cooling the liquid absorbent through regeneration effectively reduces its flash evaporation through the throttling valve, increasing the subcooling of the liquid absorbent before it enters the evaporator, thus enhancing the cooling capacity under combined cooling and heating conditions. 4. By switching valves, the regeneration process in both modes is completed in a single heat exchanger, effectively reducing system complexity and maintenance costs. 5. The throttled liquid absorbent is sprayed into the evaporator, resulting in more thorough heat exchange between the liquid absorbent and the chilled water circuit, thereby optimizing the evaporation process.

[0070] In one embodiment, reference Figure 5 The continuous absorption heat pump also includes: a solution pump (32) and an internal circulating water circuit (33); the solution pump (32) is connected in series in the internal circulating water circuit (33) to provide power for the internal circulating water; the internal circulating water circuit (33) is connected at one end to the heat exchange port of the desorption-absorber (2) and at the other end to the heat exchange port of the desorption-absorber (3).

[0071] In this embodiment, taking desorption-absorber 2 as the desorber and desorption-absorber 3 as the absorber as an example: During the absorption process, the gaseous absorbent is absorbed by the anhydrous salt in the porous matrix carrier 26, releasing heat. During the desorption process, the salt solution absorbs heat from the external circulating water circuit 19, and recovers part of the absorber heat through the internal circulating water circuit 33 for use in the desorption process. When the functions of desorption-absorber 2 and desorption-absorber 3 are interchanged, the function of the internal circulating water circuit remains the same: recovering part of the absorber heat for use in the desorption process.

[0072] The beneficial effects of this embodiment are: 1. By using part of the absorbed heat through the internal circulating water loop for the desorption process, the system's demand for external heat sources can be reduced, thus improving system performance; 2. The amount of absorbed heat recovered by the internal circulating water loop depends on the temperature overlap range between the desorber and the absorber. When the temperature overlap is within a certain range, the heat matching between the desorber and the absorber is better, and the system's heat recovery efficiency is the highest at this time.

[0073] In one embodiment, reference Figure 6 The continuous absorption heat pump further includes: valve (34), valve (35), valve (36), valve (37), flash tank (38), flash tank (39), high-temperature steam passage (40), high-temperature steam passage (41), flash liquid passage (42), and flash liquid passage (43); valve (34) is connected in series to the inlet end of the external circulating water circuit (19); valve (35) is connected in series to the inlet end of the external circulating water circuit (20); the inlet of flash tank (38) is connected to the outlet end of the external circulating water circuit (19) through valve (36), its gaseous outlet is connected to the high-temperature steam passage (40), and its liquid outlet is connected to the flash liquid passage (42); the inlet of flash tank (39) is connected to the outlet end of the external circulating water circuit (20) through valve (37), its gaseous outlet is connected to the high-temperature steam passage (41), and its liquid outlet is connected to the flash liquid passage (43).

[0074] In this embodiment, when the desorption-absorber 2 acts as a desorber, the desorption-absorber 3 acts as an absorber. Valves 5, 8, 11, 12, 35, and 36 are closed, while valves 6, 7, 10, 13, 34, 37, and expansion valve 9 are open. Mixing valve 14 connects circulating water passage 17 and circulating water passage 21, and mixing valve 15 connects circulating water passage 17 and circulating water passage 24. The external circulating water circuit 19 first passes through valve 34, then enters the desorption-absorber 2 to heat the salt solution in the porous matrix carrier 25, and then flows out through valve 10. The external circulating water circuit 20, after undergoing a second temperature rise in the desorption-absorber 3, enters the flash tank 39 through valve 37, where it undergoes depressurization flash evaporation into two phases: high-temperature steam 41 and flash liquid 43.

[0075] When the desorption-absorber 3 functions as the desorber, the desorption-absorber 2 functions as the absorber. Valves 6, 7, 10, 13, 34, and 37 are closed, while valves 5, 8, 11, 12, 35, 36, and expansion valve 9 are open. Mixing valve 14 connects circulating water passage 17 and circulating water passage 23, and mixing valve 15 connects circulating water passage 17 and circulating water passage 22. The external circulating water circuit 20 first passes through valve 35, then enters the desorption-absorber 3 to heat the salt solution in the porous matrix carrier 26, and then flows out through valve 11. The external circulating water circuit 19, after undergoing a second temperature rise in the desorption-absorber 2, enters the flash tank 38 through valve 36, where it undergoes depressurization flash evaporation into two phases: high-temperature steam 40 and flash liquid 42.

[0076] The beneficial effects of this embodiment are: 1. The gas-liquid two-phase system obtained after flash evaporation can simultaneously meet the demand for supplying high-temperature hot water and high-temperature steam, thus broadening the application scenarios of this system; 2. The flash evaporation process can be completed in a short time with low energy consumption, making it suitable for large-scale production.

[0077] In one embodiment, reference Figure 7 The continuous absorption heat pump includes p desorption-absorbers as desorbers and q desorption-absorbers as absorbers, where p and q are positive integers greater than 0.

[0078] For ease of description, only two groups are shown in the schematic diagram of Embodiment 7; the system actually includes n groups of desorption-absorbers. Each desorption-absorber in the system is connected to the condenser 4 and the evaporator 1 via upper and lower valves, respectively. When acting as a desorber, the upper valve is open and the lower valve is closed, allowing the gaseous absorbent desorbed from each desorber to enter the condenser 4 and be condensed into liquid absorbent by the circulating water passage 17. When acting as an absorber, the upper valve is closed and the lower valve is open, allowing the gaseous absorbent evaporated from the evaporator to enter each absorber to complete the absorption process. When both the upper and lower valves of the desorption-absorber are closed, the desorption-absorber stops working.

[0079] In this embodiment, p desorption-absorbers can be activated simultaneously as desorbers and q desorption-absorbers as absorbers (p and q are any positive integers less than or equal to n); however, this embodiment is not limited to the above number of desorption-absorber groups. Any non-substantial changes or substitutions made based on this embodiment should also be considered within the scope of protection of this patent.

[0080] The beneficial effects of this example are as follows: 1. By operating multiple desorption-absorbers in a mixed configuration, each desorption-absorber is connected to the condenser and evaporator via valves and can operate independently; 2. By setting up multiple sets of desorption-absorbers, the start and stop of the desorbers can adapt to changes in the load of the external driving heat source, and the start and stop of the absorbers can meet the dynamic load requirements of users, enhancing the flexibility of the system; 3. By adjusting the start and stop time interval of each set of desorption-absorbers through the opening and closing of valves, the continuous heating process of the system is optimized, while avoiding the problem of instantaneous condenser overload that is prone to occur during the switching of dual-bed systems; 4. Allowing the gaseous absorbent evaporated from the evaporator to enter multiple absorbers increases the absorbent concentration difference between the absorbers and evaporators, accelerating the absorption process.

[0081] In one embodiment, reference Figure 8 The continuous absorption heat pump based on gas-liquid-solid three-phase includes: evaporator (1), desorption-absorber (2), desorption-absorber (3), condenser (4), valve (5), valve (6), valve (7), valve (8), expansion valve (9), valve (10), valve (11), valve (12), valve (13), mixing valve (14), mixing valve (15), external chilled water circuit (16), circulating water passage (17), cooling water circuit (18), external circulating water circuit (19), external circulating water circuit (20), circulating water passage (21), circulating water passage (22), circulating water passage (23), circulating water passage (24), microcapsule (42), microcapsule (43);

[0082] The microcapsule (42) encapsulates a salt solution and is fixedly placed inside the desorption-absorber (2), with its heat exchange surface in contact with the pipeline of the external circulating water circuit (19);

[0083] The microcapsule (43) contains a salt solution and is fixed inside the desorption-absorber (3), with its heat exchange surface in contact with the pipeline of the external circulating water circuit (20).

[0084] In this embodiment, taking desorption-absorber 2 as the desorber and desorption-absorber 3 as the absorber as an example: the microcapsule 42 containing the absorbent salt solution is continuously heated by an external driving heat source, initiating the desorption process. The internal salt solution continuously concentrates to a saturated state, followed by crystal precipitation, until it is dehydrated to an anhydrous salt state and remains inside the microcapsule 42. The gaseous absorbent is desorbed from the microcapsule and enters the condenser 4, where it is condensed into a liquid absorbent by the circulating water passage 17. After being depressurized by the throttling valve 9, it enters the evaporator 1. The liquid absorbent in the evaporator absorbs heat from the external chilled water circuit 16 and evaporates into a gaseous state. It then enters the desorption-absorber 3 through the valve 6 to begin the absorption process, where it is absorbed and released heat by the anhydrous salt in the microcapsule 43. This heat is used to heat the external circulating water circuit to complete the second temperature rise. When the salt solution in the microcapsule 43 absorbs to the same concentration as the initial salt solution in the microcapsule 42, the functions of desorption-absorber 2 and desorption-absorber 3 are interchanged. After the interchange, the circulation process is similar to that before the interchange, and will not be described again here.

[0085] The beneficial effects of this example are: 1. By encapsulating the salt solution inside microcapsules, which do not directly contact the reaction bed, the metal corrosion problem associated with corrosive hygroscopic salts is effectively solved, while avoiding pipe blockage; 2. The microcapsule structure is simple and small in size, enabling continuous liquid discretization, increasing the contact area between the absorbent and the absorbent, and optimizing the heat and mass transfer process; 3. Desorption / absorption and crystallization / hydration all occur inside the microcapsule, effectively solving the problem of material failure due to repeated cycles, improving material stability and system cycle stability, and reducing maintenance costs; 4. The microcapsule encapsulation structure has a variety of styles, improving the system's adaptability.

[0086] In one embodiment, reference Figure 9 The continuous absorption heat pump based on gas-liquid-solid three-phase includes: evaporator (1), desorption-absorber (2), desorption-absorber (3), condenser (4), valve (5), valve (6), valve (7), valve (8), expansion valve (9), valve (10), valve (11), valve (12), valve (13), mixing valve (14), mixing valve (15), external chilled water circuit (16), circulating water passage (17), cooling water circuit (18), external circulating water circuit (19), external circulating water circuit (20), circulating water passage (21), circulating water passage (22), circulating water passage (23), circulating water passage (24), solution pump (44), solution pump (45), absorbent screen (46), absorbent screen (47);

[0087] The desorption-absorber (2) has a salt solution chamber at the bottom and a spray port at the top. The inlet of the solution pump (44) is connected to the outlet of the salt solution chamber, and the outlet of the solution pump (44) is connected to the spray port. The spray port is directly opposite the coil of the external circulating water circuit (19). The absorbent screen (46) is fixedly installed inside the desorption-absorber (2) above the salt solution chamber to collect the crystalline salt precipitated from the salt solution.

[0088] The desorption-absorber (3) has a salt solution chamber at the bottom and a spray port at the top. The inlet of the solution pump (45) is connected to the outlet of the salt solution chamber, and the outlet of the solution pump (45) is connected to the spray port. The spray port is directly opposite the coil of the external circulating water circuit (20). The absorbent screen (47) is fixedly installed inside the desorption-absorber (3) below the gaseous absorbent inlet to carry anhydrous salt.

[0089] In this embodiment, taking desorption-absorber 2 as the desorber and desorption-absorber 3 as the absorber as an example: Solution pump 44 is turned on, solution pump 45 is turned off, and the salt solution at the bottom of desorption-absorber 2 is pumped by solution pump 44 to the top of desorption-absorber, and then sprayed onto the coil of external circulating water circuit 19. The salt solution exchanges heat with the external circulating water, and its concentration continuously increases. After being concentrated to a saturated state, crystals precipitate. The precipitated crystal salt is collected by absorbent screen 46 to prevent crystals from entering the bottom of desorption-absorber 2 and clogging the pipes. The gaseous absorbent evaporated from the evaporator enters the desorption-absorber through valve 6, and is then adsorbed and released heat by the crystal salt on absorbent screen 47. This heat is used to heat the external circulating water circuit to complete the second temperature rise. When the crystal salt in desorption-absorber 3 is absorbed to the same concentration as the initial salt solution in desorption-absorber 2, the functions of desorption-absorber 2 and desorption-absorber 3 are interchanged. After the interchange, the circulation process is similar to that before the interchange, and will not be described again here.

[0090] The beneficial effects of this example are: 1. Using an absorbent screen to collect crystalline salt can effectively solve the blockage problem caused by solid crystalline salt entering the bottom of the desorber, ensuring the stability and reliability of the system; 2. Using a solution pump to continuously spray the salt solution to the external circulating water loop coil enhances the desorption process between the salt solution and the external circulating water.

[0091] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A continuous absorption heat pump based on gas-liquid-solid three phases, characterized in that, The continuous absorption heat pump based on a gas-liquid-solid three-phase system includes: Evaporator (1), Desorption-Absorber (2), Desorption-Absorber (3), Condenser (4), Valve (5), Valve (6), Valve (7), Valve (8), Expansion Valve (9), Valve (10), Valve (11), Valve (12), Valve (13), Mixing Valve (14), Mixing Valve (15), External Chilled Water Circuit (16), Circulating Water Circuit (17), Cooling Water Circuit (18), External Circulating Water Circuit (19), External Circulating Water Circuit (20), Circulating Water Circuit (21), Circulating Water Circuit (22), Circulating Water Circuit (23), Circulating Water Circuit (24), Porous Matrix Carrier (25), Porous Matrix Carrier (26); The evaporator (1) has its liquid absorbent inlet connected to the liquid absorbent outlet of the condenser (4) via an expansion valve (9), and its gaseous absorbent outlet connected to the gaseous absorbent inlet of the desorption-absorber (2) via a valve (5) and to the gaseous absorbent inlet of the desorption-absorber (3) via a valve (6). Its heat exchange interface is connected to the external chilled water circuit (16). The desorption-absorber (2) has a porous matrix carrier (25) fixedly installed inside. Its gaseous absorbent outlet is connected to the gaseous absorbent inlet of the condenser (4) through a valve (7). Its external heating interface is connected to the external circulating water circuit (19). The outlet of the external circulating water circuit (19) is equipped with a valve (10), and its circulating water inlet is connected to the mixing valve (14) through the circulating water passage (23). The desorption-absorber (3) has a porous matrix carrier (26) fixedly installed inside. Its gaseous absorbent outlet is connected to the gaseous absorbent inlet of the condenser (4) through a valve (8). Its external heating interface is connected to the external circulating water circuit (20). The outlet of the external circulating water circuit (20) is equipped with a valve (11), and its circulating water inlet is connected to the mixing valve (15) through the circulating water passage (24). The condenser (4) has a circulating water passage (17) and a cooling water circuit (18) running through it. One end of the circulating water passage (17) is connected to a mixing valve (14) and the other end is connected to a mixing valve (15). The two ends of the cooling water circuit (18) are respectively connected to an external cooling water supply end and a discharge end to assist in condensing gaseous absorption of the substance. The mixing valve (14) is also connected to the circulating water passage (21) and the circulating water passage (23), respectively, and the other end of the circulating water passage (21) is connected to the external circulating water. The mixing valve (15) is also connected to the circulating water passage (22) and the circulating water passage (24) respectively. The other end of the circulating water passage (22) is connected to the external circulating water. A valve (13) is installed at the inlet end of the circulating water passage (24) and a valve (12) is installed at the inlet end of the circulating water passage (23).

2. The continuous absorption heat pump based on gas-liquid-solid three phases according to claim 1, characterized in that, The continuous absorption heat pump also includes: an auxiliary compressor (27) and an auxiliary compressor (28); The auxiliary compressor (27) is installed in the pipeline between the valve (7) and the gaseous absorbent inlet of the condenser (4); The auxiliary compressor (28) is located in the pipeline between the valve (8) and the gaseous absorbent inlet of the condenser (4).

3. The continuous absorption heat pump based on gas-liquid-solid three phases according to claim 1, characterized in that, The continuous absorption heat pump also includes: an auxiliary compressor (29) and an auxiliary compressor (30); An auxiliary compressor (29) is installed in the pipeline between the valve (5) and the gaseous absorbent inlet of the desorption-absorber (2); The auxiliary compressor (30) is located in the pipeline between the valve (6) and the gaseous absorbent inlet of the desorption-absorber (3).

4. The continuous absorption heat pump based on a gas-liquid-solid three-phase system as described in claim 1, characterized in that, The continuous absorption heat pump also includes: the regenerator (31) is provided with three flow channels, the middle channel is a liquid absorbent channel, and the two side channels are gaseous absorbent channels; The intermediate channel is a pipeline located between the liquid absorbent outlet of the condenser (4) and the expansion valve (9); The two channels are provided, wherein one channel is a pipeline between the valve (5) and the gaseous absorbent inlet of the desorption-absorber (2); and the other channel is a pipeline between the valve (6) and the gaseous absorbent inlet of the desorption-absorber (3).

5. The continuous absorption heat pump based on a gas-liquid-solid three-phase system as described in claim 1, characterized in that, The continuous absorption heat pump also includes: a solution pump (32) and an internal circulating water circuit (33); The solution pump (32) is connected in series in the internal circulating water circuit (33) to provide power for the internal circulating water; One end of the internal circulating water circuit (33) is connected to the heat exchange port of the desorption-absorber (2), and the other end is connected to the heat exchange port of the desorption-absorber (3).

6. The continuous absorption heat pump based on a gas-liquid-solid three-phase system as described in claim 1, characterized in that, The continuous absorption heat pump also includes: valve (34), valve (35), valve (36), valve (37), flash tank (38), flash tank (39), high temperature steam passage (40), high temperature steam passage (41), flash liquid passage (42), and flash liquid passage (43); The valve (34) is connected in series to the inlet end of the external circulating water circuit (19); The valve (35) is connected in series to the inlet end of the external circulating water circuit (20); The inlet of the flash tank (38) is connected to the outlet of the external circulating water circuit (19) through the valve (36), its gaseous outlet is connected to the high temperature steam passage (40), and its liquid outlet is connected to the flash liquid passage (42). The inlet of the flash tank (39) is connected to the outlet of the external circulating water circuit (20) through the valve (37), its gaseous outlet is connected to the high-temperature steam passage (41), and its liquid outlet is connected to the flash liquid passage (43).

7. The continuous absorption heat pump based on a gas-liquid-solid three-phase system as described in claim 1, characterized in that, The continuous absorption heat pump includes p desorption-absorbers as desorbers and q desorption-absorbers as absorbers, where p and q are positive integers greater than 0.

8. A continuous absorption heat pump based on a gas-liquid-solid three-phase system, characterized in that, The continuous absorption heat pump based on gas-liquid-solid three-phase system includes: evaporator (1), desorption-absorber (2), desorption-absorber (3), condenser (4), valve (5), valve (6), valve (7), valve (8), expansion valve (9), valve (10), valve (11), valve (12), valve (13), mixing valve (14), mixing valve (15), external chilled water circuit (16), circulating water passage (17), cooling water circuit (18), external circulating water circuit (19), external circulating water circuit (20), circulating water passage (21), circulating water passage (22), circulating water passage (23), circulating water passage (24), microcapsule (42), microcapsule (43); The microcapsule (42) encapsulates a salt solution and is fixedly placed inside the desorption-absorber (2), with its heat exchange surface in contact with the pipeline of the external circulating water circuit (19); The microcapsule (43) contains a salt solution and is fixed inside the desorption-absorber (3), with its heat exchange surface in contact with the pipeline of the external circulating water circuit (20).

9. A continuous absorption heat pump based on a gas-liquid-solid three-phase system, characterized in that, The continuous absorption heat pump based on gas-liquid-solid three-phase system includes: evaporator (1), desorption-absorber (2), desorption-absorber (3), condenser (4), valve (5), valve (6), valve (7), valve (8), expansion valve (9), valve (10), valve (11), valve (12), valve (13), mixing valve (14), mixing valve (15), external chilled water circuit (16), circulating water passage (17), cooling water circuit (18), external circulating water circuit (19), external circulating water circuit (20), circulating water passage (21), circulating water passage (22), circulating water passage (23), circulating water passage (24), solution pump (44), solution pump (45), absorbent screen (46), absorbent screen (47); The desorption-absorber (2) has a salt solution chamber at the bottom and a spray port at the top. The inlet of the solution pump (44) is connected to the outlet of the salt solution chamber, and the outlet of the solution pump (44) is connected to the spray port. The spray port is directly opposite the coil of the external circulating water circuit (19). The absorbent screen (46) is fixedly installed inside the desorption-absorber (2) above the salt solution chamber to collect the crystalline salt precipitated from the salt solution. The desorption-absorber (3) has a salt solution chamber at the bottom and a spray port at the top. The inlet of the solution pump (45) is connected to the outlet of the salt solution chamber, and the outlet of the solution pump (45) is connected to the spray port. The spray port is directly opposite the coil of the external circulating water circuit (20). The absorbent screen (47) is fixedly installed inside the desorption-absorber (3) below the gaseous absorbent inlet to carry anhydrous salt.

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