Plate-type absorption heat exchanger

Abstract

This invention relates to a plate absorption heat exchanger, comprising a base frame, and a heat pump unit, a first solution tank, a second solution tank, a circulating pump, a brazed heat exchanger, and a detachable plate heat exchanger mounted on the base frame. The heat pump unit includes a shell divided into four chambers, each housing a generator, a condenser, an absorber, and an evaporator. The generator, condenser, absorber, and evaporator each have a plate structure. The heat pump unit of this plate absorption heat exchanger has a plate structure for its generator, condenser, evaporator, and absorber, offering advantages such as high compactness, small size, and low cost.

Description

Technical Field

[0001] This invention relates to the field of heat exchange equipment, specifically a heat exchange device that integrates a hot water absorption heat pump with a conventional heat exchanger. Background Technology

[0002] Absorption heat exchangers utilize a large amount of medium-temperature heat source to generate a small amount of high-temperature useful heat energy. That is, they are driven by medium- and low-temperature heat energy, using the potential difference between a large amount of medium-temperature heat source and a low-temperature heat source to extract heat that is less than the medium-temperature heat source but at a higher temperature. This transfers some of the medium- and low-temperature heat energy to a higher temperature, thereby improving the utilization quality of the heat source. It is an effective device for recovering and utilizing low-temperature heat energy, and has the dual functions of saving energy and protecting the environment.

[0003] The basic structure of an absorption heat exchanger in the prior art includes a generator, a condenser, an evaporator, and an absorber. The generator and condenser form a generating-condensing unit, and the absorber and evaporator form an absorbing-evaporating unit. The generator, condenser, evaporator, and absorber have a heat exchange tube structure inside. The defects of this heat exchange tube structure are low product compactness, large size, low reliability, and high cost. Summary of the Invention

[0004] The purpose of this invention is to provide a plate absorption heat exchanger designed based on the principle of absorption heat exchange. This heat exchanger is small in size, compact in structure, and low in cost.

[0005] The technical solution of the present invention:

[0006] A plate absorption heat exchanger includes a base frame, and a heat pump unit, a first solution tank, a second solution tank, a circulating pump, a brazed heat exchanger, and a detachable plate heat exchanger mounted on the base frame. The heat pump unit includes a shell, which is divided into four chambers, in which a generator, a condenser, an absorber, and an evaporator are respectively placed.

[0007] The generator, condenser, absorber, or evaporator includes a sealing plate. The sealing plate is welded to two opposing inner side walls of the heat pump unit cavity. Between the two sealing plates are multiple plate pairs, multiple upper liquid distributors, multiple lower liquid distributors, a steam collection box, an upper solution collection box, a lower solution collection box, and a rubber pad. The rubber pad is placed between the sealing plate and the multiple plate pairs.

[0008] The upper and lower ends of the plurality of plates are welded to the upper liquid distributor and the lower liquid distributor, respectively. The upper liquid distributor includes a steam channel and an upper solution channel, and the lower liquid distributor includes a lower solution channel. The internal channels of the plates are connected to the steam channel and upper solution channel of the upper liquid distributor and the lower solution channel of the lower liquid distributor.

[0009] The steam channels of the multiple upper liquid distributors converge into a steam collection box, which is connected to a steam pipe. The upper solution channels of the upper liquid distributors converge into an upper solution collection box, which is connected to an upper solution pipe. The lower solution channels of all the lower liquid distributors converge into a lower solution collection box, which is connected to a lower solution pipe.

[0010] The plates have upper and lower water inlets on their upper and lower sides, and the upper and lower water inlets are connected to the channels between the plates.

[0011] The beneficial effects of this invention are:

[0012] 1. The heat pump unit of the plate absorption heat exchanger of this application has a plate structure for the generator, condenser, evaporator and absorber, which has the advantages of high compactness, small size and low cost.

[0013] 2. Absorption heat exchangers are prone to scaling on the water side during operation, which greatly affects the heat exchange effect of plate heat pumps. Timely cleaning of water-side scale is a necessary consideration. Existing tubular absorption heat exchangers are all non-removable and cannot be cleaned. The heat pump unit of this application has a detachable structure, which can be cleaned and scaled, and has a good heat exchange effect.

[0014] 3. In this application, the small gap between the plate pairs makes cleaning difficult. As a further improvement, this application uses two sets of identical plate pairs, upper and lower liquid distributors, and pipes, with the two sets of structures interlocked. When cleaning the plate pairs is required, the two sets of structures are separated, thus increasing the gap between the plate pairs, reducing the cleaning difficulty, speeding up the process, and achieving a high level of cleanliness.

[0015] 4. When cleaning scale from an absorption heat exchanger, a challenge before the scale removal process is that during heat pump operation, the lithium bromide solution and lithium bromide vapor within the lithium bromide channel need to be maintained under vacuum to allow for evaporation and condensation at the designed temperature. Cleaning disrupts this vacuum environment, requiring re-evacuation. This application addresses this by adding valves to the steam or solution pipes outside the generator, condenser, evaporator, absorber, and lithium bromide. When cleaning is required, closing these valves maintains the vacuum environment.

[0016] 5. The plate structure of this application is novel. The plate adopts a corrugated pattern (curved corrugation), and the vertical curved corrugation can achieve an ideal liquid wetting effect, and can still achieve a high wetting rate at a low solution flow rate. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of the plate absorption heat exchanger of the present invention.

[0019] Figure 2 This is a schematic diagram of the heat pump unit structure of the plate absorption heat exchanger of the present invention.

[0020] Figure 3 This is a schematic diagram of the generator structure of the plate absorption heat exchanger of the present invention.

[0021] Figure 4 This is a schematic diagram of the condenser structure of the plate absorption heat exchanger of the present invention.

[0022] Figure 5 This is a schematic diagram of the evaporator structure of the plate absorption heat exchanger of the present invention.

[0023] Figure 6 This is a schematic diagram of the absorber structure of the plate absorption heat exchanger of the present invention.

[0024] Figure 7 This is a schematic diagram of the internal structure of a single chamber in the heat pump unit of the plate absorption heat exchanger of the present invention. (Shell and sealing plate removed)

[0025] Figure 8 This is a schematic diagram showing the positions of the solution and steam channels within the heat pump unit of the plate absorption heat exchanger of the present invention.

[0026] Figure 9 This is a schematic diagram of the internal structure of the plate absorption heat exchanger cavity of the present invention, including the plate pair, upper liquid distributor, and lower liquid distributor.

[0027] Figure 10 This is a schematic diagram of the three-dimensional structure of the plate-type absorption heat exchanger of the present invention.

[0028] Figure 11 This is a plan view of the plate of the plate absorption heat exchanger of the present invention.

[0029] Figure 12 This is a side view of the plate of the plate absorption heat exchanger of the present invention.

[0030] Figure 13 This is a schematic diagram of the liquid distributor structure inside the absorption heat pump cavity of the present invention.

[0031] Figure 14This is a schematic diagram of the PID process for the plate absorption heat exchanger of the present invention.

[0032] Marking in the label:

[0033] 1. Equipment base frame; 2. Heat pump unit; 3. First solution tank; 4. Second solution tank; 5. Circulating pump; 6. Brazed heat exchanger; 7. Detachable plate heat exchanger; 8. Generator; 9. Condenser; 10. Absorber; 11. Evaporator; 12. Sealing plate; 13. Plate pair; 14. Upper liquid distributor; 15. Lower liquid distributor; 16. Steam collection box; 17. Upper solution collection box; 18. Lower solution collection box; 19. Second plate pair; 20. Second upper liquid distributor; 22. Second steam collection box; 23. Second upper solution collection box; 24. Second lower solution collection box; 25. Steam pipe; 26. Upper solution pipe; 27. Lower solution pipe; 28. Shell; 21. Second steam pipe; 29. ​​Second upper solution pipe; 30. Second lower solution pipe; 121. Flat plate; 122. Supporting reinforcing rib; 131. Plate; 132. Arc-shaped corrugation; 133. Groove side; 134. Upper water inlet; 135. Lower water inlet; 141. Steam passage; 142. Upper solution passage; 143. Baffle plate; 151. Lower solution passage. Detailed Implementation

[0034] To clearly illustrate the objectives, technical solutions, and product advantages of this invention, the invention will be further described in detail below with reference to the accompanying drawings. However, this invention should not be construed as being limited to the embodiments described herein. As will be readily understood by those skilled in the art, the features disclosed in the exemplary embodiments can be combined. For the sake of brevity and / or clarity, well-known functions or structures are not described in detail in this application.

[0035] like Figure 1 , 2 As shown in Figure 13,

[0036] This application discloses a plate absorption heat exchanger, including an equipment base frame 1, and a heat pump unit 2, a first solution tank 3, a second solution tank 4, a circulating pump 5, a brazed heat exchanger 6, and a detachable plate heat exchanger 7 mounted on the equipment base frame 1, and also includes a pipeline vacuum device (not shown in the figure).

[0037] The heat pump unit 2 includes a housing 28, which is divided into four chambers. The generator 8, condenser 9, absorber 10, and evaporator 11 are respectively placed in the four chambers. The generator, condenser, absorber, and evaporator have the same structure.

[0038] like Figure 3-6 As shown,

[0039] The generator 8, condenser 9, absorber 10, or evaporator 11 includes a sealing plate 12. The sealing plate 12 is welded to two opposing inner sidewalls of one set of the inner cavity of the heat pump unit 2. In the attached diagram, the two sealing plates are flat plates 121 on one side near the plate pair, and supporting reinforcing ribs 122 on the other side. The supporting reinforcing ribs are welded to the sidewalls of the shell. The two sealing plates on both sides of the multiple plate pairs provide support and sealing for the plate pairs. A rubber gasket is provided between the sealing plate and the plate pair for sealing. The overall plate pair structure is welded to one side of the shell through a vapor pipe, an upper solution pipe, and a lower solution channel.

[0040] Between two sealing plates 12 are provided multiple plate pairs 13, multiple upper liquid distributors 14, multiple lower liquid distributors 15, a steam collection box 16, an upper solution collection box 17, a lower solution collection box 18, and a rubber pad. The rubber pad is placed between the sealing plates 12 and the sides of the multiple plate pairs 13, serving as a buffer and isolation mechanism. The upper and lower ends of the multiple plate pairs 13 are welded to the upper liquid distributors 14 and lower liquid distributors 15, respectively. The upper liquid distributor 14 includes a steam channel and an upper solution channel, and the lower liquid distributor includes a lower solution channel. The internal channels of the plate pairs 13 communicate with the steam channel and upper solution channel of the upper liquid distributor and the lower solution channel of the lower liquid distributor. The steam channels of the multiple upper liquid distributors 14 converge into the steam collection box, which is connected to a steam pipe 25. The upper solution channels of the upper liquid distributors converge into the upper solution collection box, which is connected to an upper solution pipe 26. The lower solution channels of all the lower liquid distributors converge into the lower solution collection box, which is connected to a lower solution pipe 27. The upper solution pipe, steam pipe, and lower solution pipe are welded to the side wall of the shell. The upper and lower ends of the plate pair 13 have upper and lower water inlets, which are connected to the channels between the plate pairs. Cold or hot water enters or exits the generator, condenser, absorber, or evaporator through the lower water inlet, the channels between the plate pairs, and the condenser, evaporator, etc., for heat exchange. This plate-type detachable heat exchange structure is compact, has good heat exchange efficiency, and can be disassembled for cleaning.

[0041] like Figure 2-6 As shown,

[0042] Each cavity of the heat pump unit casing can be equipped with a combination structure consisting of a second plate pair 19, multiple second upper liquid distributors 20, multiple second lower liquid distributors, a second steam collection box 22, a second upper solution collection box 23, a second lower solution collection box 24, and a second rubber pad. This combination structure is interleaved with the previous combination structure consisting of plate pairs, multiple upper liquid distributors, multiple lower liquid distributors, steam collection boxes, upper solution collection boxes, lower solution collection boxes, and rubber pads. The two combinations are structurally identical, and the corresponding components perform the same function. The interleaved and alternating arrangement of the two combinations increases the gaps between the plate pairs, resulting in better cleaning performance.

[0043] The added combined structure is described in detail below, including multiple second plate pairs 19, multiple second upper liquid distributors 20, multiple second lower liquid distributors, a second steam collection box 22, a second upper solution collection box 23, a second lower solution collection box 24, and a second rubber pad. The second rubber pad is placed between the second sealing plate and the sides of the multiple second plate pairs. The upper and lower ends of the multiple second plate pairs are welded to the second upper liquid distributors and the second lower liquid distributors, respectively. The second upper liquid distributor includes a second steam channel and a second upper solution channel, and the second lower liquid distributor includes a second lower solution channel. The internal channels of the second plate pairs communicate with the second steam channel and the second upper solution channel of the second upper liquid distributor, and the second lower solution channel of the second lower liquid distributor. The second steam channels of all the second upper liquid distributors converge into the second steam collection box, which is connected to the second steam pipe 21. The second upper solution channels of all the second upper liquid distributors converge into the second upper solution collection box, which is connected to the second upper solution pipe 29. The second lower solution channels of all the second lower liquid distributors converge into the second lower solution collection box, which is connected to the second lower solution pipe 30. The upper and lower ends of the sides of the second plate pair have second upper water inlets and second lower water inlets. The second upper water inlets, second lower water inlets, upper water inlets, lower water inlets, and the channels between the second plate pairs are interconnected. The combined structure of the upper liquid distributor, plate pair, and lower liquid distributor is alternately arranged with the combined structure of the second upper liquid distributor, second plate pair, and second lower liquid distributor.

[0044] like Figure 7 , 8 As shown in Figure 12,

[0045] The upper liquid distributor 14 and the second upper liquid distributor 20 have the same structure. The upper liquid distributor 14 consists of a central square steam channel 141 and two square upper solution channels 142 on both sides. One side of the square steam channel 141 and the upper solution channel 142 is open, and the other side is sealed. The lower end of the steam channel 141 is open. A partition 143 is provided in the upper solution channel 142. The lower end of the partition 143 is connected to the outer wall of the upper solution channel. A gap is left between the partition 143 and the inner and upper side walls of the upper solution channel. The upper ends of the plate pairs 13 are welded to the lower edge of the partition 143. The internal channels of the plate pairs are connected to the steam channel and the upper solution channel. The solution enters the upper solution collecting box from the upper solution pipe, and then is distributed to the upper solution channel of the upper liquid distributor through the upper solution collecting box, and then enters the channel between the plate pairs for heat exchange. Steam enters the steam collecting box from the steam pipe, and then is distributed to the steam channel of the upper liquid distributor through the steam collecting box.

[0046] like Figure 7 , 8 As shown,

[0047] The lower liquid distributor 15 and the second lower liquid distributor 21 have the same structure. The lower liquid distributor 21 is square with an elongated hole on its upper side wall. The channel inside the plate pair 13 communicates with the lower liquid distributor 21 through the elongated hole. The lower liquid distributor has an opening on one side and collects into the lower solution collection box 18. The solution enters the lower solution collection box from the lower solution pipe, and is then distributed to the lower solution channel 151 of the lower liquid distributor, and then enters the channel between the plate pairs for heat exchange.

[0048] like Figure 9-11 As shown,

[0049] The plate pair 13 and the second plate pair have the same structure. The plate pair consists of two plates 131. The main body of the plate 131 has a flat groove structure, and an arc-shaped corrugation 132 protruding to one side is pressed on the main body of the plate. The groove sides 133 of the two plates are opposite each other, and the two sides are welded together (in the attached figure, the two long sides are welded together). A channel is formed between the two plates, and each plate has an upper water inlet 134 and a lower water inlet 135 at the top and bottom. Based on experimental results and practical experience, a corrugated plate with high heat transfer coefficient, low fluid resistance, high pressure bearing capacity, and convenient mold manufacturing is designed.

[0050] like Figure 7 As shown,

[0051] As a further optimization, the optimal distribution position is that the vapor channel of the second upper liquid distributor is placed between two adjacent upper solution channels of the upper liquid distributor, the second plate pair is placed between the plate pairs, and the lower liquid distributor is placed between the second plate pairs.

[0052] like Figure 13 As shown,

[0053] The heat source pipeline is connected to the lower water inlet of the generator. The upper water inlet of the generator is connected to the hot side inlet of the detachable heat exchanger through a pipeline equipped with a valve. The hot side outlet of the detachable heat exchanger is connected to the lower water inlet of the evaporator through a pipeline equipped with a valve. The heat source is discharged from the upper water inlet of the evaporator.

[0054] The inlet pipe for cold water equipped with a valve is divided into two lines. The first line is connected to the cold side inlet of the detachable heat exchanger. The cold side outlet of the detachable heat exchanger is connected to the second line through a pipe and then connected to the cold water outlet pipe equipped with a valve. The second line of the inlet pipe for cold water equipped with a valve is connected to the lower inlet of the absorber through a pipe with a valve. The upper inlet of the absorber is connected to the lower inlet of the condenser through a pipe with a valve. The upper inlet of the condenser is connected to the first line through a pipe with a valve.

[0055] The first solution tank 3 and the second solution tank 4 are connected. The outlet of the first solution tank containing lithium bromide solution is connected to the upper solution pipes on both sides of the evaporator through a pipeline equipped with a circulation pump and valves. This pipeline is also connected to the lower solution pipes on both sides of the condenser. The steam pipes on both sides of the evaporator are connected to the steam pipes on the same side of the absorber. The lower solution pipes on both sides of the evaporator are connected to a pipeline equipped with valves. These two pipelines converge and are connected to the inlet of the first solution tank.

[0056] The lower solution pipes on both sides of the absorber are connected to the inlet of the second solution tank via pipes equipped with valves. The outlet of the second solution tank is connected to the cold side inlet of the brazed heat exchanger via a pipe equipped with a circulation pump and valves. The cold side outlet pipe of the brazed heat exchanger is divided into two paths, which are connected to the upper solution pipes on both sides of the generator via pipes equipped with valves. The outlets of the lower solution pipes on both sides of the generator are connected to the hot side inlet of the brazed heat exchanger via pipes equipped with valves. The hot side outlet of the brazed heat exchanger is divided into two branches and connected to the upper solution pipes on both sides of the absorber.

[0057] The equipment proposed in this application effectively solves the main problems of traditional absorption heat exchangers. It is a modern unit that, compared with traditional heat exchange units, has higher waste heat and other low-grade heat energy, lower operating costs, better safety, uses heat energy as power, consumes less electricity, and is more energy-efficient.

[0058] The working process of the absorption heat exchanger in this application is as follows:

[0059] On the heat source side, the heat source enters the equipment from the lower water inlet of the generator, then exits from the upper water inlet of the generator, and then enters the hot side inlet of the detachable heat exchanger. The water enters the lower water inlet of the evaporator from the hot side outlet of the detachable plate heat exchanger, and then exits from the upper water inlet of the evaporator.

[0060] On the heat sink side, the inlet is divided into two paths. The first path directly enters the cold-side inlet of the plate heat exchanger, then passes through the detachable plate heat exchanger and merges with the second path of return water at the cold-side outlet of the detachable heat exchanger. The second path directly enters the lower inlet of the absorber, flows out from the upper inlet of the absorber to the lower inlet of the condenser, then flows out from the upper inlet of the condenser and merges with the first path, forming the cold-side outlet of the heat sink side.

[0061] The lithium bromide solution flows in a closed-loop circulation system within the equipment. The lithium bromide solution in the first solution tank is propelled by a circulation pump to the upper solution pipe on one side of the evaporator and the upper solution pipe on the other side of the evaporator. This pipe is connected to the lower solution pipe on one side of the condenser and the lower solution pipe on the other side of the condenser, serving a pressure relief function. The lithium bromide solution entering the evaporator evaporates through the heat exchange section of the hot-side water, forming lithium bromide vapor. This vapor flows from the steam pipes on one side of the evaporator and the other side of the evaporator, through the steam pipes on one side of the absorber and the other side of the absorber, into the absorber. A portion of this vapor flows back to the first solution tank through the lower solution pipes on one side of the evaporator and the other side of the evaporator, merging into a single stream.

[0062] Lithium bromide vapor in the absorber is condensed and flows through the lower solution pipes on one side and the other side of the absorber, merging into a single flow to the second solution tank. The lithium bromide solution in the second solution tank is propelled by a circulating pump to the cold-side inlet of a brazed heat exchanger. After being heated by the brazed heat exchanger, it splits into two streams from the cold-side outlet, flowing to the upper solution pipes on one side and the other side of the generator, respectively. The lithium bromide, heated in the generator, then merges from the lower solution pipes on one side and the other side of the generator, flowing into the hot-side inlet of the brazed heat exchanger. After being cooled by the brazed heat exchanger, it splits into two streams from the hot-side outlet, flowing to the upper solution pipes on one side and the other side of the absorber, respectively. The cooled lithium bromide solution then merges from the lower solution pipes on one side and the other side of the absorber, flowing into the first solution tank. The entire lithium bromide solution flow system forms a closed loop.

[0063] The heat exchanger plate cleaning process described in this application is as follows:

[0064] First, close all valves on one side of the side panel that connect to the lithium bromide solution pipeline before removing the side panel;

[0065] The second step is to open the quick-connect clamp next to the valve on the pipeline to complete the pressure holding step of the lithium bromide channel.

[0066] The third step is to disassemble the side panels of the shell. As shown in the attached diagram, the overall structure of the plate pair assembly is welded to the shell through the upper solution pipe, the lower solution pipe, and the steam pipe. Therefore, after removing the side panels of the shell, the two sets of plate pair assembly structures will separate.

[0067] Step 4: Use a high-pressure water gun to rinse the dirt between the plates, and scrub with a brush until both sides of the plates are restored to stainless steel. This completes the rinsing process.

[0068] The fifth step is to reconnect and align the two sets of plates that were removed from the assembly structure.

[0069] Step 6: Connect the quick-connect clamps on the solution channel, open the valve, and complete the entire plate cleaning process.

[0070] In the description of this application, it should be understood that the terms "upper", "lower", "front", "rear", etc., indicate the orientation based on the orientation relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

Claims

1. A plate absorption heat exchanger, characterized in that: The equipment includes a base frame, and a heat pump unit, a first solution tank, a second solution tank, a circulating pump, a brazed heat exchanger, and a detachable plate heat exchanger mounted on the base frame. The heat pump unit includes a shell, which is divided into four chambers, in which a generator, a condenser, an absorber, and an evaporator are respectively placed. The generator, condenser, absorber, or evaporator includes a sealing plate. The sealing plates are welded to two opposing inner sidewalls of the heat pump unit's inner cavity. Between the two sealing plates, there are two sets of identical interlocking combination structures. Each combination structure includes multiple plate pairs, multiple upper liquid distributors, multiple lower liquid distributors, a steam collection box, an upper solution collection box, a lower solution collection box, and a rubber pad. The rubber pad is placed between the sealing plate and the side of the combination structure. The upper and lower ends of the plurality of plates are welded to the upper liquid distributor and the lower liquid distributor, respectively. The upper liquid distributor includes a steam channel and an upper solution channel, and the lower liquid distributor includes a lower solution channel. The internal channels of the plates are connected to the steam channel and upper solution channel of the upper liquid distributor and the lower solution channel of the lower liquid distributor. The steam channels of the multiple upper liquid distributors converge into a steam collection box, which is connected to a steam pipe. The upper solution channels of the upper liquid distributors converge into an upper solution collection box, which is connected to an upper solution pipe. The lower solution channels of all the lower liquid distributors converge into a lower solution collection box, which is connected to a lower solution pipe. The plates have upper and lower water inlets on their upper and lower sides, and the upper and lower water inlets and the channels between the plates are connected. Valves are installed on the steam pipe, upper solution pipe, and lower solution pipe to maintain a vacuum environment in the lithium bromide channel during cleaning.

2. A plate absorption heat exchanger according to claim 1, characterized in that: The generator, condenser, absorber, or evaporator further includes multiple pairs of second plates, multiple upper liquid distributors, multiple lower liquid distributors, a second steam collection box, a second upper solution collection box, a second lower solution collection box, and a second rubber pad, which is placed between the second sealing plate and the sides of the multiple pairs of second plates. The upper and lower ends of the multiple second plates are respectively welded to the second upper liquid distributor and the second lower liquid distributor. The second upper liquid distributor includes a second steam channel and a second upper solution channel, and the second lower liquid distributor includes a second lower solution channel. The internal channels of the second plates are connected to the second steam channel and the second upper solution channel of the second upper liquid distributor and the second lower solution channel of the second lower liquid distributor. The second steam channels of all the second upper liquid distributors converge into the second steam collection box, which is connected to the second steam pipe. The second upper solution channels of all the second upper liquid distributors converge into the second upper solution collection box, which is connected to the second upper solution pipe. The second lower solution channels of all the second lower liquid distributors converge into the second lower solution collection box, which is connected to the second lower solution pipe. The second plate has a second upper water inlet and a second lower water inlet at the upper and lower ends of its side, and the second upper water inlet, the second lower water inlet, the upper water inlet, the lower water inlet and the channel between the second plate are connected. The combined structure of the upper liquid distributor, the plate pair, and the lower liquid distributor is interlocked with the combined structure of the second upper liquid distributor, the second plate pair, and the second lower liquid distributor.

3. A plate absorption heat exchanger according to claim 2, characterized in that: The upper liquid distributor and the second upper liquid distributor have the same structure. The upper liquid distributor consists of a square steam channel in the middle and square upper solution channels on both sides. The square steam channel and the upper solution channel are open on one side and sealed on the other side. The lower end of the steam channel is open. A partition is provided in the upper solution channel. The lower end of the partition is connected to the outer wall of the upper solution channel. A gap is left between the partition and the inner and upper side walls of the upper solution channel. The upper end of the plate is welded to the lower edge of the partition. The internal channel of the plate is connected to the steam channel and the upper solution channel.

4. A plate absorption heat exchanger according to claim 2, characterized in that: The first and second lower liquid distributors have the same structure. The lower liquid distributor is square with an elongated hole on its upper side wall. The plate connects to the internal channel through the elongated hole and is open on one side, and the liquid is collected into the lower solution collection box.

5. A plate absorption heat exchanger according to claim 2, characterized in that: The plate pair and the second plate pair have the same structure. The plate pair consists of two plates. The main body of the plate has a flat groove structure. An arc-shaped corrugation protruding to one side is pressed on the main body of the plate. The groove sides of the two plates are opposite each other and the two sides are welded together. A channel is formed between the two plates. Each plate has an upper water inlet and a lower water inlet at the upper and lower ends.

6. A plate absorption heat exchanger according to claim 2, characterized in that: The vapor channel of the second upper liquid distributor is placed between two adjacent upper solution channels of the upper liquid distributor, the second plate pair is placed between the plate pairs, and the lower liquid distributor is placed between the second plate pairs.

7. A plate absorption heat exchanger according to claim 2, characterized in that: The heat source pipeline is connected to the lower water inlet of the generator. The upper water inlet of the generator is connected to the hot side inlet of the detachable heat exchanger through a pipeline equipped with a valve. The hot side outlet of the detachable heat exchanger is connected to the lower water inlet of the evaporator through a pipeline equipped with a valve. The heat source is discharged from the upper water inlet of the evaporator. The inlet pipe for cold water equipped with a valve is divided into two lines. The first line is connected to the cold side inlet of the detachable heat exchanger. The cold side outlet of the detachable heat exchanger is connected to the second line through a pipe and then connected to the cold water outlet pipe equipped with a valve. The second line of the inlet pipe for cold water equipped with a valve is connected to the lower inlet of the absorber through a pipe with a valve. The upper inlet of the absorber is connected to the lower inlet of the condenser through a pipe with a valve. The upper inlet of the condenser is connected to the first line through a pipe with a valve. The outlet of the first solution tank containing lithium bromide solution is connected to the upper solution pipes on both sides of the evaporator via a pipeline equipped with a circulation pump and valves. This pipeline is also connected to the lower solution pipes on both sides of the condenser. The steam pipes on both sides of the evaporator are connected to the steam pipes on the same side of the absorber. The lower solution pipes on both sides of the evaporator are connected to a pipeline equipped with valves. These two pipelines converge and are then connected to the inlet of the first solution tank. The lower solution pipes on both sides of the absorber are connected to the inlet of the second solution tank via pipes equipped with valves. The outlet of the second solution tank is connected to the cold side inlet of the brazed heat exchanger via a pipe equipped with a circulation pump and valves. The cold side outlet pipe of the brazed heat exchanger is divided into two paths, which are connected to the upper solution pipes on both sides of the generator via pipes equipped with valves. The outlets of the lower solution pipes on both sides of the generator are connected to the hot side inlet of the brazed heat exchanger via pipes equipped with valves. The hot side outlet of the brazed heat exchanger is divided into two branches and connected to the upper solution pipes on both sides of the absorber. The first solution tank and the second solution tank are connected.

Images