CN109341141B - Heat pipe type absorption heat exchange device with outer-pipe falling film - Google Patents
Heat pipe type absorption heat exchange device with outer-pipe falling film Download PDFInfo
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- CN109341141B CN109341141B CN201810979166.0A CN201810979166A CN109341141B CN 109341141 B CN109341141 B CN 109341141B CN 201810979166 A CN201810979166 A CN 201810979166A CN 109341141 B CN109341141 B CN 109341141B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/04—Heat pumps of the sorption type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B35/00—Boiler-absorbers, i.e. boilers usable for absorption or adsorption
- F25B35/02—Boiler-absorbers, i.e. boilers usable for absorption or adsorption using a liquid as sorbent, e.g. brine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/62—Absorption based systems
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- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The invention discloses an outside-pipe falling film heat pipe type absorption heat exchange device which comprises an absorption heat exchanger shell, an absorption solution tank and a heat pipe assembly, wherein the heat pipe assembly is a plurality of heat pipes, an air side inlet and an air side outlet of the absorption heat exchanger shell are respectively arranged on two opposite walls of the absorption heat exchanger shell, the absorption solution tank is arranged outside the absorption heat exchanger shell, each heat pipe is inserted into the absorption heat exchanger shell through the absorption solution tank, so that each heat pipe is divided into an inner section, a middle section and an outer section, the inner section is positioned in the absorption heat exchanger shell, the middle section is positioned in the absorption solution tank, the outer section is positioned outside the absorption heat exchanger shell and the absorption solution tank, and the connecting line of the heat pipe and the air side inlet and the; the outer surface of the inner section of the heat pipe is coated with a wetting layer, one part of the wetting layer is positioned in the absorption solution tank, the surface of the wetting layer positioned in the absorption solution tank is coated with a porous permeation layer, the material forming the wetting layer is a wetting material, and the material forming the porous permeation layer is a porous permeation material.
Description
Technical Field
The invention belongs to the technical field of environmental protection and chemical equipment, and relates to an outside-pipe falling film heat pipe type absorption heat exchange device.
Background
The absorption heat pump is a circulating system which utilizes a low-grade heat source to pump heat from a low-temperature heat source to a high-temperature heat source. It is an effective device for recycling low-temperature heat energy, and has the dual functions of saving energy and protecting environment.
Aiming at an absorber in the existing open absorption heat pump device, the design requires that the absorber is directly contacted with a working medium to carry out heat and mass exchange. The absorber usually uses a tubular heat exchanger as an internal cooling type heat exchanger, and can transport the latent heat of vaporization collected in the absorption process out of the absorption device, so as to maintain lower temperature in the device and ensure better absorption effect. But compared with a heat pipe type heat exchanger, the heat exchange pipe type heat exchanger has the defects of lower heat transfer coefficient, smaller heat transfer temperature difference in unit area, poorer element detachability, shutdown for single pipe damage and maintenance and the like, so the heat pipe type heat exchanger has obvious advantages in the using process.
The absorber in the existing absorption heat pump mainly adopts two forms of spraying-filling material and falling film. For the spray absorber, a high liquid-gas ratio is required to realize the absorption effect, so that a large amount of fog drops appear in the absorber, and are discharged together with flue gas through the air duct, and finally, the loss of absorption solution is caused, and the operation cost of equipment is increased. To address this problem, the current solution is to provide a demister separately at the absorber flue gas outlet, but this increases the resistance of the equipment gas phase flow. The falling film absorber is uniformly distributed into each heat exchange tube through a liquid distribution and film forming device and flows from top to bottom in a uniform film shape under the action of gravity. By adopting the form, 50-60% of absorption efficiency can be realized, the whole heat exchange effect can be improved, the power loss is reduced, and the occupied area is reduced while the size is reduced. But the large-scale industrial use is relatively difficult. Meanwhile, when the gas phase flow rate is high, the liquid film is easy to tear, and the absorption is affected.
Disclosure of Invention
In order to solve the defects of the prior art, one of the objectives of the present invention is to provide an outside-tube falling-film heat pipe type absorption heat exchanger, which can form a uniform and stable liquid film on the surface of the heat pipe type absorption heat exchanger, thereby ensuring the absorption efficiency of the absorption solution.
In order to achieve the purpose, the technical scheme of the invention is as follows:
an outside-pipe falling film heat pipe type absorption heat exchange device comprises an absorption heat exchanger shell, an absorption solution tank and a heat pipe assembly, wherein the heat pipe assembly is a plurality of heat pipes, an air side inlet and an air side outlet of the absorption heat exchanger shell are respectively arranged on two opposite walls of the absorption heat exchanger shell, the absorption solution tank is arranged outside the absorption heat exchanger shell, each heat pipe is inserted into the absorption heat exchanger shell through the absorption solution tank, so that each heat pipe is divided into an inner section, a middle section and an outer section, the inner section is positioned in the absorption heat exchanger shell, the middle section is positioned in the absorption solution tank, the outer section is positioned outside the absorption heat exchanger shell and the absorption solution tank, and the connecting line of the heat pipe and the air side inlet and the air side; the outer surface of the inner section of the heat pipe is coated with a wetting layer, one part of the wetting layer is positioned in the absorption solution tank, the outer wall surface of the wetting layer positioned in the absorption solution tank is coated with a porous permeation layer, the material forming the wetting layer is a wetting material, and the material forming the porous permeation layer is a porous permeation material.
According to the invention, the absorption solution in the absorption solution tank permeates into the wetting layer through the porous permeation layer, and when the absorption solution flows into the inner section of the heat pipe, a liquid film is formed among the wetting layer, the wetting layer and the heat pipe, and the liquid film is more complete due to the covering of the wetting material, so that the absorption efficiency of the absorption solution is improved, and meanwhile, when the absorption solution is in contact with gas, the liquid film can be prevented from being torn by airflow, and the uniform and stable liquid film is formed on the surface of the heat pipe, so that the absorption efficiency of the absorption solution is further ensured. Meanwhile, in common equipment, the temperature of the air side is generally low, heat exchange is carried out in a heat pipe mode, heat extraction can be effectively achieved, and heat exchange efficiency is improved. Therefore, the invention is suitable for various absorption heat pumps, in particular to an open absorption heat pump.
The second purpose of the invention is to provide an absorption heat pump, and the absorption heat exchanger of the absorption heat pump adopts the external falling film heat pipe type absorption heat exchange device.
The invention also aims to provide a solution dehumidifying device, wherein the absorption heat exchanger adopts the external falling film heat pipe type absorption heat exchange device.
The invention has the beneficial effects that:
1. the absorbing solution in the device of the invention flows through the wetting material, and a uniform and stable liquid film can be formed between the heat pipe and the wetting material. As the wetting material is made of a porous medium material, the airflow can pass through the surface of the wetting material to reach the liquid film for reaction; meanwhile, the wetting material can weaken the impact of the airflow on the liquid film, so that the liquid film is not easy to tear, the integrity of the liquid film on the surface of the heat pipe is ensured, and a better absorption effect can be realized.
2. The invention utilizes the heat pipe type heat exchanger to transmit the reaction heat to the outside of the device in time, and can maintain the lower temperature of the bottom liquid film, so that the absorption solution ensures higher absorption efficiency.
3. When the lower ends of the heat pipes are arranged in a suspended state, no fixing device is arranged, and the heat pipes can generate weak shaking in the operation process of equipment, so that the heat exchange is favorably strengthened.
4. Compared with the traditional tubular internal cooling absorber, the invention has higher heat transfer efficiency.
5. The liquid film of the solution is relatively complete in the flowing process, the entrainment effect of the gas on the solution is reduced, the gas flowing out of the device basically does not contain absorption solution, the requirement of additionally installing a demister is avoided subsequently, and the investment cost is reduced.
6. The invention adopts the liquid distribution part composed of the porous permeable material and the wetting material, and can effectively keep the liquid films on the outer sides of the heat pipes to be uniformly distributed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a schematic structural diagram of an absorption part of a heat pipe external falling film absorption heat exchanger;
FIG. 2 is a schematic diagram of the overall structure of a heat pipe external falling film absorption heat exchanger;
FIG. 3 is a schematic view of a structure in the form of a vertical cloth membrane;
FIG. 4 is a schematic view of a structure in the form of a horizontal cloth film;
FIG. 5 is a schematic view of a structure in the form of an inclined cloth film;
the absorption heat exchanger comprises an absorption solution tank 1, an absorption solution tank 2, a heat pipe 3, a supporting structure 4, a porous penetration material 5, a distance rib plate 6, a wetting material 7 and an absorption heat exchanger tank body.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The heat pipe described in the application is a conventional heat exchange element in the field, a typical heat pipe is composed of a pipe shell, a liquid absorption core and an end cover, working liquid in the pipe core is heated and evaporated in an evaporation section of the heating heat pipe, heat is taken away, the heat is latent heat of evaporation of the working liquid, steam flows to a condensation section of the heat pipe from a central channel, is condensed into liquid, releases latent heat at the same time, and liquid flows back to the evaporation section under the action of capillary force. In this way, a closed cycle is completed, thereby transferring a large amount of heat from the heating section to the heat dissipation section. When the heating section is arranged below, the cooling section is arranged above and the heat pipe is vertically arranged, the back flow of the working liquid can be satisfied by gravity without a wick with a capillary structure, and the heat pipe without the wick with the porous body is called a thermosiphon.
As described in the background art, the prior art has a disadvantage of poor heat and mass transfer effect, and in order to solve the technical problems, the application provides an outside-tube falling-film heat pipe type absorption heat exchange device.
The application provides an outside-pipe falling film heat pipe type absorption heat exchange device, which comprises an absorption heat exchanger shell, an absorption solution tank and a heat pipe assembly, wherein the heat pipe assembly is a plurality of heat pipes, an air side inlet and an air side outlet of the absorption heat exchanger shell are respectively arranged on two opposite walls of the absorption heat exchanger shell, the absorption solution tank is arranged outside the absorption heat exchanger shell, each heat pipe is inserted into the absorption heat exchanger shell through the absorption solution tank, so that each heat pipe is divided into an inner section, a middle section and an outer section, the inner section is positioned in the absorption heat exchanger shell, the middle section is positioned in the absorption solution tank, the outer section is positioned outside the absorption heat exchanger shell and the absorption solution tank, and a connecting line of the heat pipe and the air side inlet and the air side outlet of the absorption heat exchanger; the outer surface of the inner section of the heat pipe is coated with a wetting layer, one part of the wetting layer is positioned in the absorption solution tank, the outer wall surface of the wetting layer positioned in the absorption solution tank is coated with a porous permeation layer, the material forming the wetting layer is a wetting material, and the material forming the porous permeation layer is a porous permeation material.
This application is permeating the wetting layer through the absorption solution of porous permeable layer in with the absorption solution case, and absorption solution can form the liquid film between wetting layer and heat pipe when flowing through the heat pipe inner segment surface, because the cover of wetting material, make the liquid film more complete, thereby improve absorption solution's absorption efficiency, simultaneously with gaseous contact, can prevent that the liquid film from the air current tearing, guarantee to form even stable liquid film on the heat pipe surface, thereby further guarantee absorption solution's absorption efficiency. Meanwhile, in common equipment, the temperature of the air side is generally low, heat exchange is carried out in a heat pipe mode, heat extraction can be effectively achieved, and heat exchange efficiency is improved. Therefore, the invention is suitable for various absorption heat pumps, in particular to an open absorption heat pump and a second absorption heat pump.
The heat pipe can adopt a two-phase closed thermosiphon or a gravity heat pipe, and the material of the heat pipe can be metal or nonmetal. The evaporation section is arranged in the absorption heat exchanger, the condensation section is arranged outside the absorption heat exchanger, and the heat insulation section is arranged between the evaporation section and the condensation section. And an annular supporting structure is arranged at the contact position of the heat pipe and the upper surface of the rib plate.
The heat pipe is not parallel to a connecting line of the air side inlet and the air side outlet of the shell of the absorption heat exchanger, for example, if the connecting line of the air side inlet and the air side outlet is horizontal, the heat pipe can be vertically arranged and can be obliquely arranged; if the connecting line of the gas side inlet and the gas side outlet is vertical, the heat pipe is horizontally arranged.
Preferably, the absorption heat exchanger comprises a liquid distribution part, the liquid distribution part is positioned on the side wall of the absorption solution tank connected with the absorption heat exchanger shell, the liquid distribution part is an annular groove, a plurality of distance rib plates are arranged on the edge of the bottom of the annular groove, a through hole is formed in the center of the bottom of the annular groove, the heat pipe extends into the absorption heat exchanger shell from the absorption solution tank through a channel, and an annular supporting structure is arranged at the surface contact position of the heat pipe and the distance rib plates.
Further preferably, every two adjacent distance rib plates are perpendicular.
Further preferably, the contact surface of the supporting structure and the distance rib plate comprises a partial wetting layer, and the upper surface of the distance rib plate is flush with the upper surface of the porous permeation layer. The wetting material is tightly wrapped on the outer surface of the heat pipe, the lower part of the wetting material is sealed, the upper part of the wetting material is provided with a flanging, and the flanging is pressed and arranged below the annular supporting structure for fixing.
Preferably, the connection mode of the heat pipe and the absorption solution tank is flange connection, threaded sleeve connection or welding connection.
Preferably, the arrangement of the plurality of heat pipes is staggered or arranged in sequence.
The inner section of the heat pipe can be in a suspended state and can also be fixed by using a limiting device, and preferably, the inner section of the heat pipe is suspended. The heat pipe can generate weak vibration in the running process of the equipment, which is favorable for strengthening heat exchange
The arrangement mode of the heat pipes in the shell of the absorption heat exchanger can be vertical arrangement, inclined arrangement or horizontal arrangement.
Preferably, the inner wall of the absorption solution tank is coated with an anticorrosive coating.
Preferably, the lower part of the shell of the absorption heat exchanger is provided with a liquid collecting structure. The liquid collecting structure is a structure capable of collecting liquid, for example, the lower surface of the shell is wholly inclined, or the lower surface of the shell is provided with a V-shaped groove and the like.
Further preferably, the liquid collecting structure is provided with a liquid outlet.
Preferably, the shell of the absorption heat exchanger is of a square box structure with two protruding ends, and the inlet and the outlet on the air side are square.
Further preferably, the caliber of the inlet and the outlet at the air side is smaller than the size of the square pipeline in the middle of the absorption heat exchanger.
Further preferably, a deflector or a rectifying device is arranged behind the air side inlet along the air flow direction.
The wetting material is composed of a porous medium material, and can be made of metal porous materials, nonmetal porous materials, fiber materials and the like. Such as nylon fiber cloth, etc.
The porous material is a porous material with good liquid permeability or liquid uniform distribution performance, and can be selected from porous filler, sponge material and fiber material. Such as a water permeable sponge or the like.
Preferably, the heat exchanger comprises an external heat exchange box, and the outer section of the heat pipe extends into the external heat exchange box.
The working principle of the external falling film heat pipe type absorption heat exchange device is as follows: the reaction solution is conveyed into the absorption solution tank through a solution pump, and a certain liquid level height is reserved in the absorption solution tank. The solution flows to the side of the wetting material under the action of natural gravity and the pressure provided by an external solution pump after flowing through the solution distribution part, wets the surface of the wetting material, and uniformly flows between the wetting material and the heat pipe to form a stable liquid film. Reaction gas enters the absorption heat exchanger through the rectifying device along the horizontal direction, when the reaction gas flows through the heat pipe, the gas is in direct contact with the liquid film for reaction, and corresponding components in the gas are absorbed by the solution; during absorption, the reaction releases heat, which is transferred to the surface of the heat pipe via the liquid film and then conducted from the evaporation section to the condensation section of the heat pipe. The cold fluid in the external heat exchange box exchanges heat with the heat pipe, and the effect of absorption heat exchange is further realized.
In order to make the technical solutions of the present application more clearly understood by those skilled in the art, the technical solutions of the present application will be described in detail below with reference to specific embodiments.
Example 1
An outside-pipe falling film heat pipe type absorption heat exchange device is shown in figures 1-3 and comprises an absorption heat exchanger shell, an absorption solution tank 1, a solution pump, a solution pipeline, a liquid distribution part, a heat pipe 2 and a wetting material 6. The absorption heat exchanger is a gas-liquid reactor, two fluids are arranged in the absorption heat exchanger, and the first fluid is reaction gas and flows in the horizontal direction; the second fluid is an absorption solution, flowing in a vertical direction. The shell of the heat exchanger is of a square box structure with two protruding ends, an inlet and an outlet on the gas side are square, a rectifying device is arranged at an inlet section on the gas side, and the diameter of the inlet is smaller than the size of a square pipeline in the middle of the absorption heat exchanger. The plane of the lower part of the shell is provided with an inclination angle of 5-10 degrees, so that the solution can be conveniently collected and flow out. The absorption solution tank 1 is arranged above the shell of the absorption heat exchanger, and the absorption solution tank body is filled with the absorption solution. The liquid distribution component is of an annular groove structure and is positioned on the lower plane of the absorption solution tank 1. Four distance rib plates 5 are arranged at the bottom of the annular groove, and every two adjacent distance rib plates 5 are perpendicular. Porous permeable material 4 (permeable sponge) is filled between the distance rib plates 5, the upper surfaces of the porous permeable material 4 and the distance rib plates 5 are parallel and level, and the solution permeates to the wetting material 6 through the porous permeable material 4, so that the stability of the whole falling film is ensured. The wetting material 6 is nylon fiber cloth. The heat pipe 2 adopts a two-phase closed thermosiphon, and the heat pipe material can be metal. The evaporation section is arranged inside the absorption heat exchanger, and the condensation section is arranged outside the absorption heat exchanger. And an annular supporting structure 3 is arranged at the contact position of the heat pipe 2 and the upper surface of the distance rib plate 5. The wetting material 6 is tightly wrapped on the outer surface of the heat pipe 2, the lower part of the wetting material is sealed, the upper part of the wetting material is provided with a flange, and the flange is pressed and arranged below the annular supporting structure 3 for fixing. The heat pipe 2 penetrates through the absorption solution tank 1, the aperture of an opening above the absorption solution tank 1 is larger than the pipe diameter of the heat pipe 2, and the tank body is connected with the heat pipe 2 through a flange; the lower part of the liquid distribution component passes through a central circular hole of the liquid distribution component. The arrangement form of the heat pipes 2 can be staggered or arranged in sequence, and the lower ends of the heat pipes 2 can be in a suspended state. The positions of the liquid distribution component and the upper surface opening of the absorption solution tank correspond to the pipe distribution position of the heat pipe.
Example 2
The absorption heat exchanger is a gas-liquid reactor, two fluids are arranged in the absorption heat exchanger, and the first fluid is reaction gas and flows from bottom to top in the vertical direction; the second fluid is an absorption solution, flows along the outer wall of the heat pipe in the horizontal direction, and drops vertically after being retained at the other end of the heat pipe, as shown in fig. 4. The shell of the heat exchanger is of a square box structure with two protruding ends, an inlet and an outlet on the gas side are square, a rectifying device is arranged at an inlet section on the gas side, and the diameter of the inlet is smaller than the size of a square pipeline in the middle of the absorption heat exchanger. The plane of the lower part of the shell is provided with an inclination angle of 5-10 degrees, so that the solution can be conveniently collected and flow out. The absorption solution tank 1 is arranged on the side face of the shell of the absorption heat exchanger, an independent absorption solution tank is independently arranged at the position of each layer of pipe distribution, and the solution tank body is filled with absorption solution. The liquid distribution component is of an annular groove structure and is positioned on the plane on one side of the absorption solution tank 1. Four distance rib plates 5 are arranged in the annular groove, and every two adjacent distance rib plates 5 are perpendicular. Porous permeable material 4 (permeable sponge) is filled between the distance rib plates 5, the porous permeable material 4 is flush with the surface of one side of the distance rib plates 5, and the solution permeates to the wetting material 6 through the porous permeable material 4, so that the stability of the whole falling film is ensured. The wetting material 6 is nylon fiber cloth. The heat pipe 2 adopts a two-phase closed thermosiphon, and the heat pipe material can be metal. The evaporation section is arranged inside the absorption heat exchanger, and the condensation section is arranged outside the absorption heat exchanger. And an annular supporting structure 3 is arranged at the contact position of the heat pipe 2 and the upper surface of the distance rib plate 2. The wetting material 6 is tightly wrapped on the outer surface of the heat pipe 2, one side of the wetting material is sealed, the other side of the wetting material is provided with a flanging, and the flanging is pressed between the annular supporting structure 4 and the distance rib plate 5 for fixing. The heat pipe 2 penetrates through the absorption solution tank 1, the aperture of an opening at one side of the absorption solution tank 1 is larger than the pipe diameter of the heat pipe, and the tank body and the heat pipe 2 can be connected by welding; the other side passes through the central circular hole of the liquid distribution component. The arrangement form of the heat pipes 2 is a staggered arrangement form, and the other ends of the heat pipes 2 can be fixed through a limiting device.
Example 3
The absorption heat exchanger is a gas-liquid reactor, two fluids are arranged in the absorption heat exchanger, and the first fluid is reaction gas and flows in the vertical direction; the second fluid is an absorption solution, flows along the outer wall of the heat pipe in an inclined direction, and drops vertically after being retained at the other end of the heat pipe, as shown in fig. 5. The shell of the heat exchanger is of a square box structure with two protruding ends, an inlet and an outlet on the gas side are square, a rectifying device is arranged at an inlet section on the gas side, and the diameter of the inlet is smaller than the size of a square pipeline in the middle of the absorption heat exchanger. The plane of the lower part of the shell is provided with an inclination angle of 5-10 degrees, so that the solution can be conveniently collected and flow out. The absorption solution tank 1 is arranged on the side face of the shell of the absorption heat exchanger, an independent absorption solution tank is independently arranged at the position of each layer of pipe distribution, and the solution tank body is filled with absorption solution. The liquid distribution component is of an annular groove structure and is positioned on the plane on one side of the absorption solution tank 1. Four distance rib plates 5 are arranged at the bottom of the annular groove, and every two adjacent distance rib plates 5 are perpendicular. Porous permeable material 4 (permeable sponge) is filled between the distance rib plates 5, the upper surfaces of the porous permeable material 4 and the distance rib plates 5 are parallel and level, and the solution permeates to the wetting material 6 through the porous permeable material 4, so that the stability of the whole falling film is ensured. The wetting material 6 is nylon fiber cloth. The heat pipe 2 adopts a two-phase closed thermosiphon, and the heat pipe material can be a non-metal material. The evaporation section is arranged inside the absorption heat exchanger, and the condensation section is arranged outside the absorption heat exchanger. And an annular supporting structure 3 is arranged at the contact position of the heat pipe 2 and the upper surface of the distance rib plate 5. The heat pipe 2 is obliquely arranged, and the inclination angle is set to be 5-15 degrees. The wetting material 6 is tightly wrapped on the outer surface of the heat pipe 2, one side of the wetting material is sealed, the other side of the wetting material is provided with a flanging, and the flanging is pressed between the annular supporting structure 3 and the distance rib plates 5 for fixing. The heat pipe 2 penetrates through the absorption solution tank 1, the aperture of an opening at one side of the absorption solution tank 1 is larger than the diameter of the heat pipe, and the tank body and the heat pipe 2 can be connected by adopting a threaded sleeve; the other side passes through the central circular hole of the liquid distribution component. The arrangement form of the heat pipes 2 adopts a staggered arrangement form, and one end of each heat pipe 2 is in a suspended state.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (12)
1. An outside-pipe falling film heat pipe type absorption heat exchange device is characterized by comprising an absorption heat exchanger shell, an absorption solution tank, a heat pipe assembly and a liquid distribution part, wherein the heat pipe assembly comprises a plurality of heat pipes, an air side inlet and an air side outlet of the absorption heat exchanger shell are respectively arranged on two opposite walls of the absorption heat exchanger shell, the absorption solution tank is arranged outside the absorption heat exchanger shell, each heat pipe is inserted into the absorption heat exchanger shell through the absorption solution tank, so that each heat pipe is divided into an inner section, a middle section and an outer section, the inner section is positioned in the absorption heat exchanger shell, the middle section is positioned in the absorption solution tank, the outer section is positioned outside the absorption heat exchanger shell and the absorption solution tank, and the connecting line of the heat pipe and the air side inlet and the;
the liquid distribution part is positioned on the side wall of the absorption solution tank connected with the shell of the absorption heat exchanger, the liquid distribution part is an annular groove, a plurality of distance rib plates are arranged on the edge of the bottom of the annular groove, a through hole is formed in the center of the bottom of the annular groove, the heat pipe extends into the shell of the absorption heat exchanger from the absorption solution tank through a channel, and an annular supporting structure is arranged at the surface contact position of the heat pipe and the distance rib plates;
the outer surface of the inner section of the heat pipe is coated with a wetting layer, one part of the wetting layer is positioned in an absorption solution tank, the outer wall surface of the wetting layer positioned in the absorption solution tank is coated with a porous permeation layer, the material forming the wetting layer is a wetting material, the material forming the porous permeation layer is a porous permeation material, and the wetting material is a porous medium material;
the wetting material is tightly wrapped on the outer surface of the heat pipe, one side of the wetting material is sealed, the other side of the wetting material is provided with a flanging, and the flanging is pressed between the annular supporting structure and the distance rib plate for fixing.
2. The apparatus according to claim 1, wherein adjacent spacer webs are perpendicular in pairs.
3. The apparatus according to claim 1, wherein the contact surface of the support structure with the spacer webs comprises a partially wetting layer, and wherein the upper surfaces of the spacer webs are flush with the upper surface of the porous permeable layer.
4. The apparatus of claim 1, wherein the inner section of the heat pipe is suspended.
5. The apparatus of claim 1, wherein the interior walls of the absorption solution tank are coated with an anti-corrosive coating.
6. The apparatus of claim 1 wherein the lower portion of the shell of the absorption heat exchanger is provided with a liquid collection structure.
7. Apparatus as claimed in claim 6, wherein the liquid collecting structure is provided with a liquid outlet.
8. The apparatus of claim 1 wherein the absorption heat exchanger housing is in the form of a box structure with two ends projecting and the gas side inlet and outlet ports being square.
9. The apparatus of claim 1 wherein the air side inlet and outlet apertures are smaller than the size of the square central tube of the absorption heat exchanger.
10. The apparatus of claim 1 including an outer heat exchange box into which the outer section of the heat pipe extends.
11. An absorption heat pump, characterized in that the absorption heat exchanger adopts the external falling film heat pipe type absorption heat exchange device as claimed in any one of claims 1 to 10.
12. A solution dehumidifier, characterized in that the absorption heat exchanger adopts the external falling film heat pipe type absorption heat exchange device of any one of claims 1 to 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN109987666B (en) * | 2019-03-27 | 2021-03-19 | 山东大学 | Flexible falling film natural evaporation wastewater concentration unit and multi-section negative pressure natural evaporation wastewater concentration device |
| CN110375574B (en) * | 2019-08-19 | 2023-12-15 | 江苏建筑职业技术学院 | Falling film uniform distribution device capable of improving film distribution and exhaust performance |
| FR3114381B1 (en) * | 2020-09-18 | 2023-02-24 | Univ De Chambery Univ Savoie Mont Blanc | Sorption exchanger |
| CN115264561A (en) * | 2022-07-29 | 2022-11-01 | 湖南东尤水汽能节能有限公司 | Atmospheric heat exchange type water vapor energy heat pump air conditioning device |
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