CN110849181A - Gas-gas heat exchanger and heat exchange method thereof - Google Patents
Gas-gas heat exchanger and heat exchange method thereof Download PDFInfo
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- CN110849181A CN110849181A CN201810955666.0A CN201810955666A CN110849181A CN 110849181 A CN110849181 A CN 110849181A CN 201810955666 A CN201810955666 A CN 201810955666A CN 110849181 A CN110849181 A CN 110849181A
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- 238000000034 method Methods 0.000 title claims description 13
- 238000009826 distribution Methods 0.000 claims abstract description 69
- 239000012530 fluid Substances 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 4
- 238000012546 transfer Methods 0.000 description 16
- 230000000694 effects Effects 0.000 description 4
- 238000009423 ventilation Methods 0.000 description 3
- 238000005243 fluidization Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
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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
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
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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
- F28F9/22—Arrangements for directing heat-exchange media into successive compartments, e.g. arrangements of guide plates
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- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
The embodiment of the invention relates to a gas-gas heat exchanger, relates to the technical field of heat exchange, and mainly solves the technical problem that the existing heat exchanger is insufficient in heat exchange efficiency. The gas-gas heat exchanger includes: the shell is internally provided with a heat exchange space; a second heat exchange passage leading from the second heat exchange medium inlet to the second heat exchange medium outlet is formed in the heat exchange space; the second heat exchange passage is divided into at least two subsection passages by at least 1 flow direction distribution plate, and the flow direction distribution plate is provided with an air flow distribution hole communicated with the at least two subsection passages. The flow direction of at least two subsection passages of the second heat exchange passage is limited by the positions of the distribution holes, so that the phenomena of bias flow and vortex flow generated by the second heat exchange medium in the second heat exchange passage can be reduced, the second heat exchange medium in the second heat exchange passage uniformly flows through the plate tube, the heat exchange of the first heat exchange passage and the second heat exchange passage is improved, and the heat exchange efficiency of the heat exchanger is higher.
Description
Technical Field
The embodiment of the invention relates to the technical field of heat exchange, in particular to a gas-gas heat exchanger and a heat exchange method thereof.
Background
In the field of gas-gas heat exchangers, the traditional round tube type heat exchanger has the advantages of firm structure, large operation elasticity and wide application, and plays an important role in the field of heat exchangers at present. However, the traditional round tube type heat exchanger has obvious defects in the aspects of heat exchange efficiency, equipment structure compactness, metal consumption and the like, and is particularly remarkable in the field of gas-gas heat exchange.
Therefore, the development of a novel gas-gas heat exchanger with high heat transfer efficiency and excellent equipment compactness is of great significance.
Disclosure of Invention
In view of this, the embodiment of the present invention provides a gas-gas heat exchanger, which mainly solves the technical problem that the heat exchange efficiency of the existing heat exchanger is insufficient.
In order to achieve the above purpose, the embodiments of the present invention mainly provide the following technical solutions:
an embodiment of the present invention provides a gas-gas heat exchanger, including:
a housing having a heat exchange space therein;
the plate tube is arranged in the heat exchange space and comprises a first port and a second port which are communicated with each other;
the first heat exchange medium inlet is arranged in the shell and communicated with the first port of the plate tube;
the first heat exchange medium outlet is arranged in the shell, is communicated with the second ports of the plate tubes, and forms a first heat exchange passage leading from the first heat exchange medium inlet to the first heat exchange medium outlet in the plate tubes;
the second heat exchange medium inlet is arranged in the shell and communicated with the heat exchange space;
the second heat exchange medium outlet is arranged in the shell and communicated with the heat exchange space, and a second heat exchange passage leading from the second heat exchange medium inlet to the second heat exchange medium outlet is formed in the heat exchange space;
and the flow direction distribution plate is arranged in the heat exchange space, divides the second heat exchange passage into at least two subsection passages, and is provided with an air flow distribution hole communicated with the at least two subsection passages.
The purpose of the embodiments of the present invention and the technical problems solved thereby can be further realized by the following technical measures.
Optionally, in the gas-gas heat exchanger, the flow direction distribution plate is respectively supported by the inner wall of the shell and the outer wall of the plate tube.
Optionally, the gas-gas heat exchanger is provided, wherein the plate tube passes through the gas flow distribution hole, and a vent gap is formed between the gas flow distribution hole and the plate tube.
Optionally, the gas-gas heat exchanger is provided with at least two support parts which are supported by the outer wall of the plate tube and are arranged on the inner wall of the gas flow distribution hole.
Optionally, the gas-gas heat exchanger is provided with a first heat exchange medium inlet arranged at the first end of the shell, and the inlet ends of the plate tubes extend towards the first end of the shell;
the first heat exchange medium outlet is arranged at the second end of the shell, and the outlet ends of the plate tubes extend towards the second end of the shell;
the shell comprises a first shell wall and a second shell wall which are positioned at two sides of the section of the plate tube in the length direction, and the second heat exchange medium inlet and the second heat exchange medium outlet are arranged on the first shell wall of the shell and/or the second shell wall of the shell.
Optionally, in the gas-gas heat exchanger, the second heat exchange medium inlet is located at a first position of the shell, and the second heat exchange medium outlet is located at a second position of the shell, where the first position is farther from the first end of the shell than the second position.
Optionally, in the gas-gas heat exchanger, the plate tubes are arranged side by side, a plurality of gas flow distribution holes are formed in each flow direction distribution plate, and the plurality of plate tubes penetrate through the plurality of gas flow distribution holes of each flow direction distribution plate one by one;
at least one inlet guide plate arranged in the heat exchange space and opposite to the second heat exchange medium inlet; and/or at least one outlet guide plate is arranged in the heat exchange space and is opposite to the second heat exchange medium outlet.
Optionally, in the foregoing gas-gas heat exchanger, the inlet baffle is multiple, and each inlet baffle includes: the first plates of the inlet guide plates are distributed in the extension direction of the plate tubes, and fluid of the second heat exchange medium inlet is divided to the peripheries of different plate tubes.
Optionally, the aforementioned gas-gas heat exchanger, wherein each inlet baffle comprises: a second plate extending in the direction of extension of the plate tubes, the second plate of the plurality of inlet baffles being distributed in the length direction of the plate tube cross-section.
Optionally, in the foregoing gas-gas heat exchanger, the outlet guide plate is multiple, and each outlet guide plate includes: and the third plates of the plurality of inlet guide plates are distributed in the length direction of the cross section of the plate pipe and guide the fluid on the peripheries of different plate pipes to the second heat exchange medium outlet.
Optionally, the aforementioned gas-gas heat exchanger, wherein each outlet baffle comprises: a fourth plate extending in the length direction of the plate tube cross-section, the fourth plate of the plurality of outlet baffles being distributed in the plate tube extension direction.
Optionally, the gas-gas heat exchanger further includes:
a first tubesheet and a second tubesheet;
the plate tubes are arranged side by side, and a plurality of tube connecting ports are respectively arranged on the first tube plate and the second tube plate; the first tube sheet is arranged in the shell; the second tube plate is arranged in the shell, and the heat exchange space is formed between the first tube plate and the second tube plate in the shell; the first ports of the plate tubes are in one-to-one corresponding sealing connection with the tube connecting ports of the first tube plate; and the second ports of the plate tubes are hermetically connected with the tube connecting ports of the second tube plate in a one-to-one correspondence manner.
Optionally, in the gas-gas heat exchanger, a ratio of the length to the width of the cross section of the plate tube is greater than or equal to 5.
By means of the technical scheme, the gas-gas heat exchanger provided by the technical scheme of the invention at least has the following advantages:
in the technical scheme provided by the embodiment of the invention, in the heat exchange process, a first heat exchange medium is introduced into a first heat exchange medium inlet, the first heat exchange medium enters a first heat exchange passage, a second heat exchange medium is introduced into a second heat exchange medium inlet, and the second heat exchange medium enters a second heat exchange passage, wherein the flow direction of at least two segmented passages of the second heat exchange passage is limited by the positions of distribution holes, so that the phenomena of bias flow and vortex flow generated by the second heat exchange medium in the second heat exchange passage can be reduced, the heat exchange of the first heat exchange passage and the second heat exchange passage is improved, and the heat exchange efficiency of the heat exchanger is higher.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the embodiments of the present invention more clear and clear, and to implement the technical solutions according to the contents of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and accompanying drawings.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic view of an internal structure of a gas-gas heat exchanger according to an embodiment of the present invention;
FIG. 2 is a first schematic cross-sectional view of FIGS. 1A-A;
FIG. 3 is a schematic structural diagram of a flow direction distribution plate of a first gas-gas heat exchanger provided by an embodiment of the invention;
FIG. 4 is a schematic cross-sectional view of a first plate tube of a gas-gas heat exchanger according to an embodiment of the present invention;
FIG. 5 is a schematic cross-sectional view of a second plate tube of a gas-gas heat exchanger according to an embodiment of the present invention;
FIG. 6 is a schematic cross-sectional view of a third plate tube of a gas-gas heat exchanger according to an embodiment of the present invention;
FIG. 7 is a schematic cross-sectional view of a fourth plate tube of a gas-gas heat exchanger according to an embodiment of the present invention;
FIG. 8 is a schematic view of a first inlet baffle arrangement for a gas-to-gas heat exchanger according to an embodiment of the present invention;
FIG. 9 is a schematic view of a second inlet baffle configuration for a gas-to-gas heat exchanger according to an embodiment of the present invention;
fig. 10 is a schematic view of a first outlet baffle arrangement for a gas-to-gas heat exchanger according to an embodiment of the present invention;
fig. 11 is a schematic view of a second outlet baffle structure of a gas-gas heat exchanger according to an embodiment of the present invention;
FIG. 12 is a second schematic cross-sectional view of FIGS. 1A-A;
FIG. 13 is a schematic structural view of a flow direction distribution plate of a second gas-gas heat exchanger according to an embodiment of the present invention;
FIG. 14 is a third schematic cross-sectional view of FIGS. 1A-A;
FIG. 15 is a schematic view of a third gas-to-gas heat exchanger flow direction distribution plate configuration provided in accordance with an embodiment of the present invention;
FIG. 16 is a fourth schematic cross-sectional view of FIGS. 1A-A;
fig. 17 is a schematic view of a flow direction distribution plate of a fourth gas-gas heat exchanger according to an embodiment of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the objectives of the embodiments of the present invention, the following detailed description of the embodiments, structures, features and effects of the gas-gas heat exchanger according to the present invention will be made with reference to the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Fig. 1 to fig. 3 show an embodiment of the gas-gas heat exchanger provided by the present invention, in which a first heat exchange medium flows as shown by a double-dashed arrow in fig. 1, and a second heat exchange medium flows as shown by a solid arrow in fig. 1. Referring to fig. 1 to 3, a gas-gas heat exchanger according to an embodiment of the present invention includes: a shell 10, a first heat exchange medium inlet 20, a first heat exchange medium outlet 30, a plate tube 40, a second heat exchange medium inlet 50, a second heat exchange medium outlet 60 and at least 1 flow distribution plate 70.
The shell 10 has a heat exchange space inside; the section of the plate tube 40 is non-circular, the plate tube 40 is arranged in the heat exchange space, and the plate tube 40 comprises a first port and a second port which are communicated with each other; a first heat exchange medium inlet 20 is arranged in the shell 10, and the first heat exchange medium inlet 20 is communicated with the first port of the plate tube 40; a first heat exchange medium outlet 30 is arranged in the shell 10, the first heat exchange medium outlet 30 is communicated with the second port of the plate tube 40, and a first heat exchange passage leading from the first heat exchange medium inlet 20 to the first heat exchange medium outlet 30 is formed in the plate tube 40; a second heat exchange medium inlet 50 is arranged in the shell 10, and the second heat exchange medium inlet 50 is communicated with the heat exchange space; a second heat exchange medium outlet 60 is arranged in the shell 10, the second heat exchange medium outlet 60 is communicated with the heat exchange space, and a second heat exchange passage leading from the second heat exchange medium inlet 50 to the second heat exchange medium outlet 60 is formed in the heat exchange space; at least one flow distribution plate 70 is disposed in the heat exchange space, at least 1 flow distribution plate 70 divides the second heat exchange passage into at least two segmented passages, and the flow distribution plate 70 is provided with an air distribution hole 701 communicating with the at least two segmented passages B.
In the heat exchange process, a first heat exchange medium is introduced into a first heat exchange medium inlet, the first heat exchange medium enters a first heat exchange passage, a second heat exchange medium is introduced into a second heat exchange medium inlet, the second heat exchange medium enters a second heat exchange passage, wherein the flow direction of at least two subsection passages of the second heat exchange passage is limited by the position of the distribution hole, so that the phenomena of bias flow and vortex flow generated by the second heat exchange medium in the second heat exchange passage can be reduced, the second heat exchange medium in the second heat exchange passage uniformly flows through the plate tube, the heat exchange of the first heat exchange passage and the second heat exchange passage is improved, and the heat exchange efficiency of the heat exchanger is higher.
Wherein the shell 10 comprises a first end and a second end, the first heat exchange medium inlet 20 is arranged at the first end of the shell 10, and the inlet ends of the plate tubes 40 extend towards the first end of the shell 10; the first heat exchange medium outlet 30 is arranged at the second end of the shell 10, and the outlet ends of the plate tubes 40 extend towards the second end of the shell 10; the shell 10 includes a first shell wall and a second shell wall located on both sides of the plate-tube cross section in the length direction, and the second heat exchange medium inlet and the second heat exchange medium outlet are provided in the first shell wall of the shell and/or the second shell wall of the shell. That is, in some embodiments, the second heat exchange medium inlet and the second heat exchange medium outlet may be disposed on the first shell wall at the same time, or the second heat exchange medium inlet and the second heat exchange medium outlet may be disposed on the second shell wall at the same time.
In other embodiments, the second heat exchange medium inlet 50 is provided in the first shell wall and the second heat exchange medium outlet 60 is provided in the second shell wall. The second heat exchange medium inlet is located at a first position of the shell, the second heat exchange medium outlet is located at a second position of the shell, and the first position is far away from the first end of the shell compared with the second position. The second heat exchange medium firstly flows into the shell in the length direction of the section of the plate tube in the shell and then flows in the extending direction of the plate tube, the flowing direction of the second heat exchange medium in the extending direction of the plate tube of the shell is opposite to the flowing direction of the first heat exchange medium in the plate tube, so that high-efficiency countercurrent heat exchange is realized, and finally, the second heat exchange medium flows out of the shell in the length direction of the section of the plate tube of the shell.
The cross section of the plate tube is flat and long, as shown in fig. 4, the ratio L/W of the length L to the width W is greater than or equal to 5, and it is known from the theory of heat transfer that the heat transfer performance of the plate tube increases with the increase of the ratio L/W of the cross section aspect ratio, and the larger the aspect ratio, the higher the heat transfer efficiency. The second heat exchange medium inlet direction and the second heat exchange medium outlet direction may be arranged along a length direction of the cross section of the plate tube.
The section of the strip may be a plane-symmetric figure, specifically, an oval, a straight strip, an oblong, a rectangle, a dumbbell, a curved strip, a polygon, etc., for example, the upper and lower sides of the section are wavy and are formed in a mirror image relationship. Or, the plate tube extends along the central axis, and the section of the plate tube, which is perpendicular to the length direction of the cross section, is in a wave-shaped fluctuation shape. In the first embodiment, as shown in fig. 4, two outer end surfaces in the length L direction of the elongated cross section are arc surfaces, and two outer end surfaces in the middle section in the length L direction of the elongated cross section are flat surfaces. As shown in fig. 5, two outer end surfaces in the length L direction of the long strip-shaped cross section are flat surfaces, two outer end surfaces in the middle section in the length L direction of the long strip-shaped cross section are flat surfaces, and 4 corners of the long strip-shaped cross section are arc-shaped chamfered surfaces. In the second embodiment, the two outer end surfaces in the length L direction of the long-strip-shaped cross section are arc surfaces, and the two opposite outer end surfaces in the middle section in the length L direction of the long-strip-shaped cross section are curved surfaces which are bent in the same direction. In the third embodiment, the two outer end surfaces in the length L direction of the long-strip-shaped cross section are arc surfaces, and the two opposite outer end surfaces in the middle section in the length L direction of the long-strip-shaped cross section are curved surfaces which are bent oppositely. The curved surface curved in the opposite direction may be curved in a convex-concave manner in the longitudinal direction L of the cross section as shown in fig. 6, or may be curved in a concave-convex manner in the longitudinal direction L of the cross section as shown in fig. 7.
The number of the plate tubes is not limited to 1, for example, as shown in fig. 2 and 3, the plate tubes 40 are arranged side by side, the gas flow distribution holes 701 formed in each flow direction distribution plate 70 are plural, and the plurality of plate tubes 40 pass through the plurality of gas flow distribution holes 701 formed in each flow direction distribution plate 70 one by one. For ease of installation, in a specific implementation, as shown in fig. 1, the heat exchanger further comprises: a first tube plate 101 and a second tube plate 102, wherein the first tube plate 101 and the second tube plate 102 are respectively provided with a plurality of tube connecting ports (not shown in the figure); the first tube sheet 101 is disposed in the shell 10; the second tube plate 102 is disposed in the shell 10, and the heat exchange space is formed between the first tube plate 101 and the second tube plate 102 in the shell 10; the first ports of the plurality of plate tubes are hermetically connected with the plurality of tube connection ports of the first tube plate 101 in a one-to-one correspondence manner; the second ports of the plurality of plate tubes are hermetically connected with the plurality of tube connection ports of the second tube plate 102 in a one-to-one correspondence. The size of the pipe connecting port can be matched with the size of the cross section of the plate pipe, so that the first port of the plate pipe is in sealing connection with the pipe connecting port of the first pipe plate, and the second port of the plate pipe is in sealing connection with the pipe connecting port of the second pipe plate.
Wherein, the second heat transfer medium turns to the flow process on the casing inner plate pipe extending direction after the length direction of plate pipe cross-section flows into the casing, appears phenomenon such as bias current easily, is difficult to realize turning to flow to the even heat transfer of in-process with a plurality of plate pipes, and is further, still includes: at least one inlet baffle 80 is disposed in the heat exchange space opposite the second heat exchange medium inlet 50. In practice, as shown in fig. 8, the inlet baffle comprises: the first plate 801 extends in the length direction of the cross section of the plate pipe, the inlet guide plate is in a shape of a straight plate, the first plate 801 can be parallel to the inlet flow direction of the second heat exchange medium inlet, the first end of the first plate 801 extends to the second heat exchange medium inlet, the second end of the first plate 801 extends to the plate pipe, the first plate 801 is provided with a through hole for penetrating through the plate pipe, and the first plate 801 can guide the second heat exchange medium to flow to the plate pipe for heat exchange. When the inlet baffle is plural, each inlet baffle includes: the first plates of the inlet guide plates are distributed in the extension direction of the plate tubes, fluid at the second heat exchange medium inlet is distributed to the peripheries of different plate tubes, the first ends of the first plates of the inlet guide plates extend to the second heat exchange medium inlet, and the second ends of the first plates of the inlet guide plates extend to different plate tubes. Further, as shown in fig. 1 and 9, each inlet baffle 80 includes: the second plates 802 extend in the extension direction of the plate tubes of the shell, the second plates 802 of the inlet guide plates are distributed in the length direction of the cross section of the plate tubes of the shell, the second plates 802 and the first plates 801 form an integral component, the inlet guide plates are in an inverted L-shaped plate shape, and the second plates 802 can be perpendicular to the first plates 801, so that the second heat exchange medium is uniformly guided to the space area where the plate tubes are located from the second heat exchange medium inlet, the second heat exchange medium inlet vortex area is effectively eliminated, the bias flow degree of the second heat exchange medium is reduced, the flow field is rectified, the reverse fluidization degree of the two heat exchange media in the second heat exchange medium inlet plate tube area is improved, and the heat exchange efficiency is improved. The plurality of inlet baffles 80 are arranged in a stepped manner to achieve the guiding of the air flow turning direction. A plurality of inlet baffles may be disposed in the second heat exchange path in a direction of flow of the second heat exchange medium forward of the distributor plate. The widths of the first plate and the second plate are not limited, and it is easy to understand that the width of the first plate and the second plate is narrow to a certain extent to form the rod.
Wherein, the second heat transfer medium turns to the flow process in the length direction of casing plate tube cross-section after the casing plate tube extending direction flows, phenomenons such as bias current appear easily, is difficult to realize turning to the even heat transfer with a plurality of plate tubes of flow direction in-process, and is further, as shown in fig. 1, still include: at least one outlet baffle 90 disposed in the heat exchange space opposite the second heat exchange medium outlet 60. In practice, as shown in fig. 10, the outlet baffle comprises: the outlet guide plate is a straight plate, the third plate 901 may be parallel to the extension direction of the plate tubes, the third plate 901 may be at a position facing the outlet of the second heat exchange medium in the length direction of the plate tube section of the housing, and the plate surface of the third plate 901 is opposite to the outlet of the second heat exchange medium. When the outlet baffle is a plurality of, each outlet baffle includes: and the third plates of the plurality of inlet guide plates extend to different positions facing the second heat exchange medium outlet in the extension direction of the plate tubes of the shell. Further, as shown in fig. 1 and 11, each outlet baffle includes: the fourth plate 902 extends in the length direction of the plate tube section of the shell, the fourth plate 902 is provided with a through hole for penetrating through the plate tube, the fourth plates 902 of the outlet guide plates are distributed in the extension direction of the plate tube of the shell, the fourth plates 902 and the third plates 901 can form an integral component, the outlet guide plates are in an L-shaped plate shape, and the fourth plates 902 and the third plates 901 can be perpendicular, so that the second heat exchange medium is uniformly guided to the second heat exchange medium outlet from the plate tube area, a second heat exchange medium outlet vortex area is effectively eliminated, the bias flow degree of the second heat exchange medium is reduced, the flow field is rectified, the reverse fluidization degree of the two heat exchange media in the second heat exchange medium outlet plate tube area is improved, and the heat exchange efficiency is improved. The plurality of outlet baffles 90 are arranged in a step shape to guide the air flow in a turning direction. The plurality of outlet guide plates can be arranged at the last flow direction of the second heat exchange medium in the second heat exchange passage to the rear of the distribution plate. The widths of the third plate and the fourth plate are not limited, and it is easy to understand that the bars can be formed by the widths of the third plate and the fourth plate being narrow to a certain extent.
The flow distribution plate may be supported on the inner wall of the shell or alternatively, the flow distribution plate may be supported on the outer wall of the plate tube. In the implementation, the length of the plate tube is longer, and when the flow velocity of the heat exchange medium is faster, the longer plate tube is easy to vibrate. Therefore, the flow distribution plate can be respectively supported with the inner wall of the shell and the outer wall of the plate tube, so that the flow distribution plate can reinforce the plate tube, and the running stability of the heat exchanger is improved.
The number of the gas distribution holes flowing to the distribution plate is not limited to 1, and the gas distribution holes are specifically designed according to the specific condition of gas in the heat exchange space. For example, in some embodiments, the deck tube passes through the gas flow distribution aperture with a vent gap between the gas flow distribution aperture and the deck tube. The second heat exchange medium penetrates through the two segmented passages through the ventilation gaps, is uniformly distributed in the process of passing through the ventilation gaps, and can generate efficient countercurrent heat exchange with the first medium in the plate tube, so that the heat exchange efficiency of the heat exchanger is improved.
The mode of realizing the support of the flow direction distribution plate and the outer wall of the plate tube can be realized by adopting an air flow distribution hole, the inner wall of the air flow distribution hole is provided with at least two supporting parts which are supported with the outer wall of the plate tube, and the at least two supporting parts clamp the outer wall of the plate tube. In some embodiments, the at least two support portions include a first support end and a second support end that support both ends of the cross-sectional length direction of the plate tube.
For example, as shown in fig. 12 and 13, the first support end and the second support end are both recessed slots 701a on the outer side of the inner wall of the air distribution hole, specifically, the air distribution holes 701 are independently arranged, the width of the air distribution hole 701 is greater than the width of the plate tube 40, and the air gap is formed between the wall of the air distribution hole 701 and the plate tube 40.
Alternatively, as shown in fig. 14 and 15, at least some of the plurality of gas distribution holes may communicate to form a combined gas distribution hole 702, and the vent gap may be formed in the space between the outer walls of two adjacent plate tubes 40 within the combined gas distribution hole 702.
Of course, the first supporting end and the second supporting end may also be the first protrusion protruding from the inner wall of the airflow distribution hole.
Further, the at least two support portions may further include a third support end and a fourth support end that support both ends of the plate tube in the cross-sectional width direction.
For example, as shown in fig. 3, the third supporting end and the fourth supporting end may be second protrusions 701b protruding from the inner wall of the airflow distribution hole. Specifically, the first support end and the second support end may also be a first protrusion 701c protruding from the inner wall of the airflow distribution hole. Alternatively, as shown in fig. 16 and 17, the third supporting end and the fourth supporting end may be second protrusions 701b protruding from the inner wall of the airflow distribution hole, and the first supporting end and the second supporting end are locking grooves 701a recessed outside the inner wall of the airflow distribution hole 701.
As shown in fig. 1, the flow distribution plate 70 can be at least 2, and at least 2 flow distribution plates 70 can be distributed across the length or width of the shell plate tube cross-section. The greater the number of flow direction distribution plates 70, the more stable the flow direction distribution can be adjusted.
The embodiment provided by the invention at least has the following advantages:
1. the heat transfer efficiency is high.
a. The ratio of the length to the width of the cross section of the plate pipe is not less than 5, the cross section of the plate pipe is a flat cross section, the heat transfer performance of the plate pipe is increased along with the increase of the ratio of the length to the width of the cross section, the length to the width is larger, and the heat transfer efficiency is higher;
b. a ventilation gap along the axial direction of the plate pipe is formed between the flow direction distribution plate and the outer wall of the plate pipe, and the flow direction from the first heat exchange medium inlet to the first heat exchange medium outlet and the flow direction from the second heat exchange medium inlet to the second heat exchange medium outlet are arranged in a reverse direction, so that a countercurrent heat exchange flow of the first heat exchange medium and the first heat exchange medium is formed, the effective heat transfer temperature difference is improved, and the heat exchange effect is enhanced;
c. the inlet guide plate arranged in the second heat exchange medium inlet area and the outlet guide plate arranged in the second heat exchange medium outlet area effectively eliminate the vortex area in the two areas and reduce the bias flow degree of the medium, and rectify the flow field, so that the counterflow degree of the two heat exchange media is improved, and the heat exchange area and the heat transfer effect of the areas are enhanced.
2. The structure is compact.
The larger the ratio L/W of the section length to the width of the plate pipe is, the larger the size of the shell is, the arrangement density of the plate pipe is large, the heat transfer area is large, and the heat transfer efficiency is high, so that the structure is more compact when the heat transfer quantity is the same.
3. The medium steering elbow box required by the cross-flow heat exchange multi-tube pass is eliminated, and the processing and the manufacturing are simple and convenient.
The heat exchange method of the gas-gas heat exchanger of the above embodiment of the present invention includes: and introducing a first heat exchange medium to the first heat exchange medium inlet, and introducing a second heat exchange medium to the second heat exchange medium inlet, so that the first heat exchange medium of the first heat exchange passage in the plate tube and the second heat exchange medium of the second heat exchange passage outside the plate tube perform countercurrent heat exchange.
The first heat exchange medium after heat exchange flows out through the first heat exchange medium outlet in a reverse heat exchange mode, and the second heat exchange medium after heat exchange flows out through the second heat exchange medium outlet in a reverse heat exchange mode.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
It will be appreciated that the relevant features of the devices described above may be referred to one another. In addition, "first", "second", and the like in the above embodiments are for distinguishing the embodiments, and do not represent merits of the embodiments.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed apparatus should not be construed to reflect the intent as follows: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
Those skilled in the art will appreciate that the components of the apparatus of the embodiments may be adapted and arranged in one or more arrangements different from the embodiments. The components of the embodiments may be combined into one component and, in addition, they may be divided into a plurality of sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the components of any apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments may be used in any combination. The various component embodiments of the present invention may be implemented in hardware, or in a combination thereof.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or components not listed in a claim. The word "a" or "an" preceding a component or element does not exclude the presence of a plurality of such components or elements. The invention may be implemented by means of an apparatus comprising several distinct elements. In the claims enumerating several means, several of these means may be embodied by one and the same item. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are still within the scope of the technical solution of the present invention.
Claims (14)
1. A gas-to-gas heat exchanger, comprising:
a housing having a heat exchange space therein;
the plate tube is arranged in the heat exchange space and comprises a first port and a second port which are communicated with each other;
the first heat exchange medium inlet is arranged in the shell and communicated with the first port of the plate tube;
the first heat exchange medium outlet is arranged in the shell, is communicated with the second ports of the plate tubes, and forms a first heat exchange passage leading from the first heat exchange medium inlet to the first heat exchange medium outlet in the plate tubes;
the second heat exchange medium inlet is arranged in the shell and communicated with the heat exchange space;
the second heat exchange medium outlet is arranged in the shell and communicated with the heat exchange space, and a second heat exchange passage leading from the second heat exchange medium inlet to the second heat exchange medium outlet is formed in the heat exchange space;
and the flow direction distribution plate is arranged in the heat exchange space, divides the second heat exchange passage into at least two subsection passages, and is provided with an air flow distribution hole communicated with the at least two subsection passages.
2. Gas-gas heat exchanger according to claim 1,
the flow direction distribution plate is respectively supported with the inner wall of the shell and the outer wall of the plate pipe.
3. Gas-gas heat exchanger according to claim 2,
the plate tube penetrates through the air flow distribution hole, and an air vent gap is formed between the air flow distribution hole and the plate tube.
4. A gas-gas heat exchanger according to claim 3,
the inner wall of the air distribution hole is provided with at least two supporting parts which are supported with the outer wall of the plate tube.
5. A gas-gas heat exchanger according to claim 1, further comprising:
a first tubesheet and a second tubesheet;
the plate tubes are arranged side by side, and a plurality of tube connecting ports are respectively arranged on the first tube plate and the second tube plate; the first tube sheet is arranged in the shell; the second tube plate is arranged in the shell, and the heat exchange space is formed between the first tube plate and the second tube plate in the shell; the first ports of the plate tubes are in one-to-one corresponding sealing connection with the tube connecting ports of the first tube plate; and the second ports of the plate tubes are hermetically connected with the tube connecting ports of the second tube plate in a one-to-one correspondence manner.
6. Gas-gas heat exchanger according to claim 1,
the ratio of the length to the width of the cross section of the plate tube is more than or equal to 5.
7. Gas-gas heat exchanger according to any one of claims 1 to 6,
the first heat exchange medium inlet is arranged at the first end of the shell, and the inlet ends of the plate tubes extend towards the first end of the shell;
the first heat exchange medium outlet is arranged at the second end of the shell, and the outlet ends of the plate tubes extend towards the second end of the shell;
the shell comprises a first shell wall and a second shell wall which are positioned at two sides of the section of the plate tube in the length direction, and the second heat exchange medium inlet and the second heat exchange medium outlet are arranged on the first shell wall of the shell and/or the second shell wall of the shell.
8. Gas-gas heat exchanger according to claim 7,
the second heat exchange medium inlet is located at a first position of the shell, the second heat exchange medium outlet is located at a second position of the shell, and the first position is far away from the first end of the shell compared with the second position.
9. Gas-gas heat exchanger according to claim 8,
the plate pipes are arranged side by side, the airflow distribution holes formed in each flow direction distribution plate are multiple, and the plurality of plate pipes penetrate through the airflow distribution holes of each flow direction distribution plate one by one;
at least one inlet guide plate arranged in the heat exchange space and opposite to the second heat exchange medium inlet; and/or at least one outlet guide plate is arranged in the heat exchange space and is opposite to the second heat exchange medium outlet.
10. Gas-gas heat exchanger according to claim 9,
the inlet baffle is a plurality of, and each inlet baffle includes: the first plates of the inlet guide plates are distributed in the extension direction of the plate tubes, and fluid of the second heat exchange medium inlet is divided to the peripheries of different plate tubes.
11. Gas-gas heat exchanger according to claim 10,
each inlet baffle includes: a second plate extending in the direction of extension of the plate tubes, the second plate of the plurality of inlet baffles being distributed in the length direction of the plate tube cross-section.
12. Gas-gas heat exchanger according to claim 9,
the outlet baffle is a plurality of, and every outlet baffle includes: and the third plates of the plurality of inlet guide plates are distributed in the length direction of the cross section of the plate pipe and guide the fluid on the peripheries of different plate pipes to the second heat exchange medium outlet.
13. Gas-gas heat exchanger according to claim 12,
each outlet baffle includes: a fourth plate extending in the length direction of the plate tube cross-section, the fourth plate of the plurality of outlet baffles being distributed in the plate tube extension direction.
14. A method of exchanging heat in a gas-to-gas heat exchanger as claimed in any one of claims 1 to 13, comprising:
and introducing a first heat exchange medium to the first heat exchange medium inlet, and introducing a second heat exchange medium to the second heat exchange medium inlet, so that the first heat exchange medium of the first heat exchange passage in the plate tube and the second heat exchange medium of the second heat exchange passage outside the plate tube perform countercurrent heat exchange.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810955666.0A CN110849181A (en) | 2018-08-21 | 2018-08-21 | Gas-gas heat exchanger and heat exchange method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810955666.0A CN110849181A (en) | 2018-08-21 | 2018-08-21 | Gas-gas heat exchanger and heat exchange method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN110849181A true CN110849181A (en) | 2020-02-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810955666.0A Pending CN110849181A (en) | 2018-08-21 | 2018-08-21 | Gas-gas heat exchanger and heat exchange method thereof |
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