CN113883925A - Uniform liquid film evaporation heat exchanger and method - Google Patents
Uniform liquid film evaporation heat exchanger and method Download PDFInfo
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- CN113883925A CN113883925A CN202111210630.8A CN202111210630A CN113883925A CN 113883925 A CN113883925 A CN 113883925A CN 202111210630 A CN202111210630 A CN 202111210630A CN 113883925 A CN113883925 A CN 113883925A
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- heat exchange
- heat exchanger
- liquid film
- water distribution
- cavity
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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
- F28D5/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, using the cooling effect of natural or forced evaporation
- F28D5/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, using the cooling effect of natural or forced evaporation in which the evaporating medium flows in a continuous film or trickles freely over the conduits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F11/00—Arrangements for sealing leaky tubes and conduits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
- F28F13/02—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by influencing fluid boundary
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
- F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
- F28F21/081—Heat exchange elements made from metals or metal alloys
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/001—Casings in the form of plate-like arrangements; Frames enclosing a heat exchange core
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/007—Auxiliary supports for elements
- F28F9/0075—Supports for plates or plate assemblies
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/001—Casings in the form of plate-like arrangements; Frames enclosing a heat exchange core
- F28F2009/004—Common frame elements for multiple cores
Abstract
The invention provides a uniform liquid film evaporation heat exchanger and a method, the uniform liquid film evaporation heat exchanger comprises a heat exchanger shell with a hollow interior and a heat exchange module fixed in the heat exchanger shell, the heat exchange module consists of a plurality of heat exchange units, each heat exchange unit comprises a metal sheet cavity with openings at two ends, a metal wire mesh arranged on the outer wall surface of the metal sheet cavity and a support structure arranged in the metal sheet cavity, the top of the metal sheet cavity is provided with an arched protrusion, the bottom of the metal sheet cavity is rectangular, and the support structure forms a heat exchange working medium channel in the metal sheet cavity; the heat exchanger is characterized in that a plurality of water distribution channels which correspond to the heat exchange units one by one are arranged at the top of the heat exchanger shell, and blast ports are arranged at the bottom of the heat exchanger shell and used for forming air flow channels at two sides of the heat exchange units. The evaporation heat exchanger has the functions of uniformly spraying, inhibiting the thickening of a liquid film and being convenient to disassemble and replace, and has a compact structure and a good heat exchange effect.
Description
Technical Field
The invention belongs to the technical field of heat exchange, and particularly belongs to a uniform liquid film evaporation heat exchanger and a method.
Background
Nowadays, heat exchangers play an important role from heating in daily life to industries such as chemical industry, petroleum industry, power industry and the like. Among them, the dividing wall type heat exchanger, in which cold and hot fluids are separated by a solid wall surface and heat exchange is performed by the heat conduction action of the solid wall surface, is most widely used.
The evaporation heat exchanger is one of the dividing wall type heat exchangers, the traditional evaporation heat exchanger adopts a tubular structure, hot fluid flows in a tube, cold water is sprayed on the outer surface of the tube, a layer of liquid film with higher turbulence degree is formed on the outer surface of the tube, the liquid film evaporates to absorb heat, and then the cold fluid and the hot fluid achieve the purpose of heat exchange through the heat conduction effect of the tube wall. Wherein, the liquid film formed outside the tube plays a great role in improving the heat exchange effect of the heat exchanger.
At present, the heat exchange effect of an evaporation heat exchanger is still influenced by a plurality of factors, and the problems of uneven spraying, gradual thickening of a boundary layer under the influence of gravity, surface dirt and the like of a liquid film directly influence the convection heat transfer effect outside a pipe.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a uniform liquid film evaporation heat exchanger and a method, which have the functions of uniformly spraying, inhibiting the liquid film from thickening and being convenient to disassemble and replace, and have the advantages of compact structure and good heat exchange effect.
In order to achieve the purpose, the invention provides the following technical scheme: a uniform liquid film evaporation heat exchanger comprises a heat exchanger shell with a hollow interior and a heat exchange module fixed in the heat exchanger shell, wherein the heat exchange module consists of a plurality of heat exchange units, each heat exchange unit comprises a metal sheet cavity with openings at two ends, a metal wire mesh arranged on the outer wall surface of the metal sheet cavity and a support structure arranged in the metal sheet cavity, the top of the metal sheet cavity is provided with an arched protrusion, the bottom of the metal sheet cavity is rectangular, and the support structure forms a heat exchange working medium channel in the metal sheet cavity; the heat exchanger is characterized in that a plurality of water distribution channels which correspond to the heat exchange units one by one are arranged at the top of the heat exchanger shell, and blast ports are arranged at the bottom of the heat exchanger shell and used for forming air flow channels at two sides of the heat exchange units.
Furthermore, the supporting structure comprises a supporting end plate and a supporting pipe, the supporting end plate is arranged in openings at two sides of the metal sheet cavity, the supporting pipe is arranged inside the metal sheet cavity, two ends of the supporting pipe are respectively fixed on the supporting end plate, and the supporting end plate and the supporting pipe are arranged close to the inner wall of the metal sheet cavity.
Furthermore, the supporting end plate is provided with a clamping groove communicated with the supporting tube and an inter-groove through hole formed between the clamping grooves, the inner diameter of the clamping groove is smaller than the diameter of the supporting tube, a heat exchange working medium channel is formed in the metal sheet cavity through the clamping groove, the inter-groove through hole and the supporting tube, the supporting tube comprises a top supporting circular tube, an intermediate supporting square tube and a bottom supporting square tube, and the number of the intermediate supporting square tube is at least one.
Furthermore, the wire mesh is a stainless steel wire mesh, an alloy wire mesh or a copper wire mesh, and the specification is 40-120 meshes; the metal thin plate cavity is made of a metal material with high heat conductivity coefficient, and the thickness of the metal thin plate is 0.15-0.4 mm.
Furthermore, each water distribution channel comprises a vertical water distribution channel, a horizontal water distribution channel and a water distribution hole, wherein an inlet of the vertical water distribution channel is connected with an external water source, an outlet of the vertical water distribution channel is connected with an inlet of the horizontal water distribution channel, the horizontal water distribution channel and the heat exchange unit are arranged in the same plane, the outlet of the horizontal water distribution channel is provided with the water distribution hole, and the water distribution hole is arranged at the top of the heat exchange unit.
Further, the heat exchanger shell comprises end plates, an upper cover plate, a lower cover plate and a baffle plate, the end plates are arranged at the front end and the rear end of the fixed heat exchange unit and are used for fixing the heat exchange unit, the upper portions and the lower portions of the two end plates are respectively connected with the upper cover plate and the lower cover plate, the left end and the right end of the two end plates are connected with the baffle plate, a plurality of water distribution channels which correspond to the heat exchange units one by one are arranged in the upper cover plate, and the blast ports are arranged on the lower cover plate.
Furthermore, a fixed clamping groove is formed in the end plate and used for fixing and supporting the end plate, a clamping groove and an inter-groove through hole are formed in the fixed clamping groove, and the positions, the shapes, the sizes and the number of the clamping groove and the inter-groove through hole are the same as those of the clamping groove and the inter-groove through hole formed in the supporting end plate; the heat exchanger is characterized in that a first boss and a second boss are arranged on the periphery of the end plate respectively, the number and the shape of the fixing clamping grooves are matched with the heat exchange units, the first boss is used for connecting the upper cover plate and the lower cover plate, and the second boss is used for connecting the left baffle and the right baffle.
Furthermore, an exhaust port is formed in the upper cover plate, a water outlet is formed in the lower cover plate, the water outlet is formed right below the heat exchange units, the number of the water outlet is equal to that of the heat exchange units, and the air blowing ports are formed in two sides of the water outlet and correspond to the exhaust port.
The invention also provides a using method of the uniform liquid film evaporation heat exchanger, when the uniform liquid film evaporation heat exchanger is in a heating mode, a gas working medium to be heated enters a heat exchange working medium channel formed by the metal sheet cavity of the heat exchange unit, heat exchange liquid enters the heat exchanger shell through a water distribution channel in the heat exchanger shell, liquid flowing out of the water distribution channel falls on the heat exchange unit, a uniform liquid film channel is formed between the metal wire mesh and the metal sheet cavity, and the heating of the gas working medium to be heated is realized under the heat conduction effect of the metal sheet cavity.
Furthermore, when the uniform liquid film evaporation heat exchanger is in a cooling mode, gas working media to be cooled enter a heat exchange working medium channel formed by a metal sheet cavity of the heat exchange unit, cooling liquid enters the inside of the heat exchanger shell through a water distribution channel in the heat exchanger shell, liquid coming out of the water distribution channel falls on the heat exchange unit to form a uniform liquid film channel between the metal wire mesh and the metal sheet cavity, air is blown into the inside of the heat exchanger shell through a blast hole in the lower cover plate to form air flow channels opposite to the flowing direction of the liquid film on two sides of the heat exchange unit, the liquid film is evaporated in the air to take away part of heat, and cooling of the gas working media to be cooled is achieved under the heat conduction action of the metal sheet cavity.
Compared with the prior art, the invention has at least the following beneficial effects:
the invention provides a uniform liquid film evaporation heat exchanger, wherein a heat exchange unit consists of a metal wire mesh and a metal sheet cavity, a heat exchange channel is arranged in the metal sheet cavity and is used for passing a heat exchange working medium, the metal wire mesh is attached to the outer surface of the metal sheet cavity, when heat exchange liquid falls on the heat exchange unit, the heat exchange liquid freely and flatly moves between the metal wire mesh and the metal sheet cavity under the action of gravity to form a uniform liquid film channel under the action of an arch at the top of the metal sheet cavity, the metal wire mesh enables the liquid film to be more uniform and stable under the action of self gravity and surface tension, a boundary layer is thinned, thermal resistance is reduced, and the heat exchange effect is improved.
Furthermore, a plurality of water distribution channels which are arranged on the top of the heat exchanger shell and correspond to the plurality of heat exchange units one by one can enable the dripping effect of the heat exchange liquid to be more uniform;
furthermore, the arrangement of the supporting end plates and the supporting tubes in the heat exchange unit can better ensure the strength of the metal sheet, avoid unnecessary deformation of the metal sheet in the heat exchange process and prolong the service life of the heat exchange unit; meanwhile, due to the modular design of the heat exchange units, the heat exchange units can be conveniently detached and replaced, and the number of the heat exchange units can be increased or decreased according to different heat exchange requirements.
Furthermore, the clamping grooves in the front end face and the rear end face are matched with the supporting end plates in the heat exchange units, so that the effect of fixing the heat exchange units can be achieved, the sealing effect can be achieved, and liquid films between the metal sheets and the metal wire meshes are prevented from permeating into the metal sheet cavities from two sides.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural diagram of a heat exchange module;
FIG. 3 is an exploded view of the heat exchange unit;
FIG. 4 is a schematic structural view of a support end plate;
FIG. 5 is a schematic structural view of the front and rear endplates;
FIG. 6 is a schematic structural view of the upper cover plate;
fig. 7 is a schematic structural view of the lower cover plate.
Wherein, 1 is a heat exchange module, 2 is an end plate, 3 is an upper cover plate, 4 is a lower cover plate, 5 is a baffle, 6 is a heat exchange unit, 7 is a wire mesh, 8 is a metal thin plate cavity, 901 is a top supporting round pipe, 902 is a middle supporting square pipe, 903 is a bottom supporting square pipe, 10 is a supporting end plate, 1001 is a top clamping groove, 1002 is a middle square groove, 1003 is a bottom square groove, 1004 is an inter-groove through hole, 201 is a fixing clamping groove, 202 is a first boss, 203 is a second boss, 204 is a top air hole, 205 is a supporting inter-pipe air hole, 206 is a middle air hole, 207 is a bottom air hole, 301 is a vertical water distribution channel, 302 is a horizontal water distribution channel, 303 is an exhaust port, 304 is a water distribution hole, 401 is an air blowing port, and 402 is a water discharge port.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure.
Referring to fig. 1 and 2, the uniform liquid film evaporation heat exchanger according to the present invention includes a heat exchanger shell with a hollow interior, the heat exchanger shell is composed of two end plates 2, an upper cover plate 3, a lower cover plate 4 and two baffles 5, a heat exchange chamber is provided inside the heat exchanger shell, a heat exchange module 1 is provided in the heat exchange chamber, the heat exchange module 1 is composed of a plurality of heat exchange units 6 arranged in parallel, each heat exchange unit 6 is composed of a metal thin plate cavity 8 with openings at two ends, a metal wire mesh 7 arranged on the outer wall surface of the metal thin plate cavity 8 and a supporting structure arranged inside the metal thin plate cavity 8, an arch-shaped protrusion is provided at the top of the metal thin plate cavity 8, a uniform channel liquid film is formed between the inner wall surface of the metal wire mesh 7 and the outer wall surface of the metal thin plate cavity 8, and the supporting structure is used for supporting the metal thin plate cavity 8 to form a heat exchange channel in the metal thin plate cavity 8;
referring to fig. 3, the supporting structure includes top support pipe 901 that sets up at sheet metal cavity 8 inside, middle support side's pipe 902 and bottom support side's pipe 903, and set up the support end plate 10 in the opening of 8 both sides of sheet metal cavity respectively, wherein top support pipe 901, middle support side's pipe 902, bottom support side's pipe 903 and support end plate 10 all hug closely in 8 inner walls of sheet metal cavity setting, the area of contact of support side's pipe both sides and 8 inner walls of sheet metal cavity is big, thereby can provide certain support intensity, make sheet metal non-deformable under the condition that inside working medium flows.
Preferably, the number of the middle support square tubes 902 is greater than or equal to one, and the number of the middle support square tubes 902 is determined by the support strength of the sheet metal cavity 8, and is between the top support round tube 901 and the bottom support square tube 903.
Referring to fig. 4, the supporting end plate 10 includes a top clamping groove 1001, a plurality of middle square clamping grooves 1002, a bottom square clamping groove 1003 and an inter-groove through hole 1004, wherein the top clamping groove 1001 is disposed corresponding to the top supporting circular tube 901, the middle square clamping grooves 1002 are disposed corresponding to the middle supporting square tubes 902, the number of the middle square clamping grooves 1002 is equal to that of the middle supporting square tubes 902, and the bottom square clamping grooves 1003 are disposed corresponding to the bottom supporting square tubes 903;
the inter-groove through holes 1004 are right opposite to a cavity surrounded by the metal thin plate cavity 8, the top supporting circular tube 901, the middle supporting square tube 902 and the bottom supporting square tube 903, and the top supporting circular tube 901, the middle supporting square tube 902, the bottom supporting square tube 903 and the inter-groove through holes 1004 are used for introducing a heat exchange working medium into the heat exchange unit 6;
preferably, the support end plate 10 is further provided with a connection hole for connecting the front and rear end plates 2.
Referring to fig. 5, the end cap 2 is provided with a fixing clamp slot 201 for limiting the heat exchanging unit 6, and a first boss 202 and a second boss 203 which are arranged around the end cap 2, wherein the fixing clamp slot 201 is provided with a top air hole 204 corresponding to a top round hole of the supporting end plate 10 and a top round supporting pipe 901 round hole, an inter-supporting pipe air hole 205 corresponding to a through hole 1004 in the supporting end plate 10, a middle air hole 206 corresponding to a middle hole in the middle supporting square pipe 902, and a bottom air hole 207 corresponding to a middle hole in the bottom supporting square pipe 903, and the fixing clamp slot 201 is further provided with a connecting hole for fixing the supporting end plate 10, wherein the first boss 202 is used for connecting the upper cover plate 3 and the lower cover plate 4, and the second boss 203 is used for connecting the left and right baffle plates 5.
Referring to fig. 6, the upper cover plate 3 is provided therein with vertical water distribution channels 301, horizontal water distribution channels 302 and water distribution holes 304, wherein the number of the vertical water distribution channels 301 and the horizontal water distribution channels 302 is the same as that of the heat exchange unit 6, an inlet of the vertical water distribution channel 301 is connected to an external water source, an outlet of the vertical water distribution channel 301 is connected to an inlet of the horizontal water distribution channel 302, the bottom of the horizontal water distribution channel 302 is provided with a strip-shaped groove, i.e., a water distribution hole 304, facing the top of the heat exchange unit 6,
the upper cover plate 3 is also provided with air outlets 303, the air outlets 303 are arranged on two sides of the water distribution channel, and the bottom of the upper cover plate 3 is arranged around the connecting holes connected with the front end plate 2, the rear end plate 2 and the left baffle 5 and the right baffle 5.
Referring to fig. 7, the lower cover plate 4 includes air vents 401 and water outlets 402, wherein the water outlets 402 are disposed right below the heat exchange units 6 and have the same number as the heat exchange units 6, the air vents 401 are disposed on both sides of the water outlets 402 and correspond to the air outlets 303 one by one, and the top of the lower cover plate 4 is disposed around the connection holes connected to the front and rear end plates 2 and the left and right baffle plates 5.
Preferably, the material, thickness and mesh size of the wire mesh 7 can be matched according to a fluid medium, and a stainless steel mesh, an alloy mesh, a copper wire mesh and the like can be selected, and the specification is 40-120 meshes;
preferably, the metal sheet cavity 8 is made of a metal material with a high thermal conductivity coefficient, such as stainless steel, aluminum alloy and the like, and the thickness of the material is 0.15-0.4 mm, depending on the situation;
preferably, the arched protrusion at the top of the metal sheet cavity 8 enables liquid falling on the top of the metal sheet cavity 8 to flow downwards under the action of gravity, and the bottom of the metal sheet cavity 8 is rectangular, so that the liquid is prevented from permeating into the cavity from a sewing position at the bottom of the metal sheet cavity 8;
preferably, the thickness of the liquid film on the metal sheet cavity 8 can be controlled by controlling the water supply quantity in the water distribution channel in the upper cover plate 3, and the thickness of the liquid film needs to be larger than the evaporation quantity of water;
preferably, the size of the heat exchange channel depends on the ventilation amount.
The specific working process of the invention is as follows:
the device mainly comprises three paths for working medium circulation:
1. air passages formed by the sheet metal cavity 8 and the heat exchanger shell: outdoor air enters from the blast port 401 of the lower cover plate 4 and is discharged from the exhaust port 303 of the upper cover plate 3;
2. the metal wire mesh 7 and the metal sheet cavity 8 form a uniform liquid film channel: liquid enters the horizontal water distribution channel 302 from the vertical water distribution channel 301 on the upper cover plate 3 and then flows to the water distribution holes 304, drips to the top of the heat exchange unit 6, forms a uniform liquid film between the wire mesh 7 and the metal sheet cavity 8 under the action of gravity and surface tension, and flows out from the water outlet 402 of the lower cover plate 4;
3. the heat exchange working medium channel formed by the metal thin plate cavity 8, the top supporting round pipe 901, the middle supporting square pipe 902 and the bottom supporting square pipe 903 is as follows: the heat exchange working medium flows in from the top air hole 204, the support inter-tube air hole 205, the middle air hole 206 and the bottom air hole 207 of the front end plate and correspondingly flows out from the rear end plate.
Meanwhile, the invention has two working modes: a heating mode and a cooling mode;
when the invention is used for heating gas working medium to be heated, the gas working medium to be heated enters the heat exchanger from the heat exchange working medium channel formed by the metal thin plate cavity 8, the top supporting circular tube 901, the middle supporting square tube 902 and the bottom supporting square tube 903, and the top air hole 204, the air hole 205 between the supporting tubes, the middle air hole 206 and the bottom air hole 207 of the front end plate, meanwhile, liquid with higher temperature enters the heat exchanger from the vertical water distribution channel 301 and the horizontal water distribution channel 302 in the upper cover plate 3, and the liquid drops to the top end of the heat exchange unit 6 from the water distribution holes 304, under the action of the self gravity and the surface tension of the liquid, the liquid with higher temperature forms a good and uniform liquid film channel between the metal wire mesh 7 and the metal thin plate cavity 8, the temperature of the gas working medium to be heated is raised through the heat conduction function of the metal thin plate cavity 8, and finally the liquid follows the outer surface of the metal thin plate cavity 8, And dropped toward the drain port 402 and recovered.
When the invention is used for cooling the gas working medium to be cooled, the gas working medium to be cooled enters the heat exchange working medium channel formed by the top air hole 204, the support inter-tube air hole 205, the middle air hole 206 and the bottom air hole 207 of the front end plate, the metal thin plate cavity 8, the top support circular tube 901, the middle support square tube 902 and the bottom support square tube 903, meanwhile, the liquid with normal temperature or lower temperature enters the heat exchanger from the vertical water distribution channel 301 and the horizontal water distribution channel 302 in the upper cover plate 3, the liquid drops to the top end of the heat exchange unit 6 from the water distribution holes 304, under the action of the self gravity and the surface tension of the liquid, the liquid for cooling forms a good and uniform liquid film channel between the metal wire mesh 7 and the metal thin plate cavity 8, the air enters the heat exchanger from the air blast port 401 through the air channel formed by the metal thin plate cavity 8 and the shell and is discharged from the air outlet 303, air flow channels opposite to the flowing direction of the liquid film are formed on two sides of the heat exchange unit 6, natural convection heat exchange between air and the liquid film is formed, the liquid film is evaporated in the air to take away a part of heat, the heat exchange driving force is increased, the cooling effect is improved, the temperature of the gas working medium to be cooled is reduced through the heat conduction effect of the metal sheet cavity 8, and liquid flowing down along the outer surface of the metal sheet cavity 8 drips towards the water outlet 402 and is recovered.
Claims (10)
1. The uniform liquid film evaporation heat exchanger is characterized by comprising a heat exchanger shell with a hollow interior and a heat exchange module (1) fixed in the heat exchanger shell, wherein the heat exchange module (1) consists of a plurality of heat exchange units (6), each heat exchange unit (6) comprises a metal sheet cavity (8) with openings at two ends, a metal wire mesh (7) arranged on the outer wall surface of the metal sheet cavity (8) and a supporting structure arranged in the metal sheet cavity (8), the top of the metal sheet cavity (8) is provided with an arched protrusion, the bottom of the metal sheet cavity (8) is rectangular, and the supporting structure forms a heat exchange working medium channel in the metal sheet cavity (8); the heat exchanger is characterized in that a plurality of water distribution channels which correspond to the heat exchange units (6) one by one are arranged at the top of the heat exchanger shell, and blast holes (401) are formed in the bottom of the heat exchanger shell and used for forming air flow channels on two sides of the heat exchange units (6).
2. A uniform liquid film evaporator heat exchanger according to claim 1, c h a r a c t e r i z e d in that the support structure comprises support end plates (10) and support tubes, the support end plates (10) are arranged in openings at both sides of the sheet metal cavity (8), the support tubes are arranged inside the sheet metal cavity (8), both ends of the support tubes are fixed to the support end plates (10), respectively, and the support end plates (10) and the support tubes are arranged against the inner wall of the sheet metal cavity (8).
3. The uniform liquid film evaporation heat exchanger according to claim 2, wherein the supporting end plate (10) is provided with clamping grooves communicated with the supporting tube and through holes (1004) between grooves, the inner diameter of each clamping groove is smaller than the diameter of the supporting tube, and a heat exchange working medium channel is formed on the metal sheet cavity (8) through the clamping grooves, the through holes (1004) between grooves and the supporting tube; the supporting tube comprises a top supporting round tube (901), a middle supporting square tube (902) and a bottom supporting square tube (903), and the number of the middle supporting square tube (902) is at least one.
4. The uniform liquid film evaporation heat exchanger according to claim 1, wherein the wire mesh (7) is a stainless wire mesh, an alloy wire mesh or a copper wire mesh, and the specification is 40-120 meshes; the metal thin plate cavity (8) is made of a metal material with a high heat conductivity coefficient, and the thickness of the metal thin plate is 0.15-0.4 mm.
5. The uniform liquid film evaporation heat exchanger according to claim 1, wherein each water distribution channel comprises a vertical water distribution channel (301), a horizontal water distribution channel (302) and a water distribution hole (304), wherein an inlet of the vertical water distribution channel (301) is connected with an external water source, an outlet of the vertical water distribution channel (301) is connected with an inlet of the horizontal water distribution channel (302), the horizontal water distribution channel (302) and the heat exchange unit (6) are arranged in the same plane, an outlet of the horizontal water distribution channel (302) is provided with the water distribution hole (304), and the water distribution hole (4) is arranged at the top of the heat exchange unit (6).
6. The uniform liquid film evaporation heat exchanger according to claim 1, wherein the heat exchanger shell comprises end plates (2), an upper cover plate (3), a lower cover plate (4) and baffle plates (5), the end plates (2) are arranged at the front end and the rear end of the fixed heat exchange unit (6) and are used for fixing the heat exchange unit (6), the upper parts and the lower parts of the two end plates (2) are respectively connected with the upper cover plate (3) and the lower cover plate (4), the left end and the right end of the two end plates (2) are connected with the baffle plates (5), a plurality of water distribution channels corresponding to the heat exchange units (6) one by one are arranged in the upper cover plate (3), and the blast holes (401) are arranged on the lower cover plate (4).
7. The uniform liquid film evaporation heat exchanger according to claim 6, wherein the end plate (2) is provided with a fixing clamping groove (201) for fixing and supporting the end plate (10), the fixing clamping groove (201) is provided with a clamping groove and through holes (1004) between the clamping groove and the through holes between the grooves are the same as the clamping groove and the through holes (1004) between the clamping groove and the through holes between the grooves which are provided on the supporting end plate (10); end plate (2) are provided with first boss (202) and second boss (203) respectively all around, the quantity and the shape and the heat transfer unit (6) phase-match of fixed slot (201), first boss (202) are used for connecting upper cover plate (3), lower apron (4), and two baffles (5) about second boss (203) are used for connecting.
8. The uniform liquid film evaporation heat exchanger according to claim 6, wherein the upper cover plate (3) is provided with an exhaust port (303), the lower cover plate (4) is provided with a water outlet (402), the water outlet (402) is arranged right below the heat exchange unit (6) and has the same number as the heat exchange unit (6), and the air blowing ports (401) are arranged on two sides of the water outlet (402) and correspond to the exhaust port (303).
9. The use method of the uniform liquid film evaporation heat exchanger according to any one of claims 1 to 8, wherein when the uniform liquid film evaporation heat exchanger is in a heating mode, the gas working medium to be heated enters the heat exchange working medium channel formed by the sheet metal cavity (8) of the heat exchange unit (6), the heat exchange liquid enters the interior of the heat exchanger shell through the water distribution channel in the heat exchanger shell, the liquid coming out of the water distribution channel falls on the heat exchange unit (6), the uniform liquid film channel is formed between the wire mesh (7) and the sheet metal cavity (8), and the heating of the gas working medium to be heated is realized under the heat conduction action of the sheet metal cavity (8).
10. The method of using a uniform liquid film evaporation heat exchanger according to claim 9, it is characterized in that when the uniform liquid film evaporation heat exchanger is in a cooling mode, a gas working medium to be cooled enters a heat exchange working medium channel formed by a metal sheet cavity (8) of a heat exchange unit (6), cooling liquid enters the heat exchanger shell through a water distribution channel in the heat exchanger shell, liquid coming out of the water distribution channel falls on the heat exchange unit (6) to form a uniform liquid film channel between the metal wire mesh (7) and the metal sheet cavity (8), air is blown into the heat exchanger shell through a blast hole (401) in the lower cover plate (4) to form air flow channels opposite to the flowing direction of the liquid film on two sides of the heat exchange unit (6), the liquid film is evaporated in the air to take away part of heat, and cooling of gas working media to be cooled is achieved under the heat conduction action of the metal sheet cavity (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111210630.8A CN113883925B (en) | 2021-10-18 | 2021-10-18 | Uniform liquid film evaporation heat exchanger and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111210630.8A CN113883925B (en) | 2021-10-18 | 2021-10-18 | Uniform liquid film evaporation heat exchanger and method |
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