CN110849181A - Air-to-air heat exchanger and heat exchange method thereof - Google Patents

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

Air-to-air heat exchanger and heat exchange method thereof

technical field

The embodiments of the present invention relate to the technical field of heat exchange, and in particular, to a gas-gas heat exchanger and a heat exchange method thereof.

Background technique

In the field of gas-to-air heat exchangers, traditional circular tube heat exchangers have the advantages of firm structure, large operating flexibility and wide use, and currently occupy an important position in the field of heat exchangers. However, the traditional circular tube heat exchanger has significant shortcomings in terms of heat exchange efficiency, compactness of equipment structure and metal consumption, especially in the field of gas-to-air heat exchange.

Therefore, it is of great significance to develop a new type of gas-air heat exchanger with high heat transfer efficiency and excellent equipment compactness.

SUMMARY OF THE INVENTION

In view of this, the embodiments of the present invention provide an air-gas heat exchanger, and the main technical problem to be solved is that the heat exchange efficiency of the existing heat exchanger is insufficient.

To achieve the above purpose, the embodiments of the present invention mainly provide the following technical solutions:

Embodiments of the present invention provide a gas-to-air heat exchanger, comprising:

The shell has a heat exchange space inside;

a plate tube, which is arranged in the heat exchange space, and includes a first port and a second port that communicate with each other;

The first heat exchange medium inlet is arranged on the casing and communicates with the first port of the plate tube;

The first heat exchange medium outlet is arranged on the casing and communicates with the second port of the plate tube, and a passage from the first heat exchange medium inlet to the first heat exchange medium outlet is formed in the plate tube. the first heat exchange path;

The second heat exchange medium inlet is arranged on the casing and communicates with the heat exchange space;

The second heat exchange medium outlet is arranged on the casing and communicates with the heat exchange space, and a second heat exchange medium outlet leading from the second heat exchange medium inlet to the second heat exchange medium outlet is formed in the heat exchange space. Two heat exchange paths;

At least one flow distribution plate is arranged in the heat exchange space, and the second heat exchange passage is divided into at least two segmented passages, and the flow distribution plate is provided with an air flow connecting the at least two segmented passages Assign holes.

The purpose of the embodiments of the present invention and the solution to the technical problems thereof can be further achieved by adopting the following technical measures.

Optionally, in the aforementioned gas-gas heat exchanger, the flow distribution plate is respectively supported on the inner wall of the casing and the outer wall of the plate tube.

Optionally, in the aforementioned gas-to-air heat exchanger, wherein the plate tube passes through the airflow distribution hole, and there is a ventilation gap between the airflow distribution hole and the plate tube.

Optionally, in the aforementioned gas-to-air heat exchanger, the inner wall of the gas distribution hole has at least two support portions supported by the outer wall of the plate tube.

Optionally, in the aforementioned gas-gas heat exchanger, wherein the first heat exchange medium inlet is disposed at the first end of the casing, and the inlet end of the plate tube extends toward the first end of the casing;

The first heat exchange medium outlet is arranged at the second end of the casing, and the outlet end of the plate tube extends toward the second end of the casing;

The shell includes a first shell wall and a second shell wall located on both sides of the plate tube section in the longitudinal direction, and the second heat exchange medium inlet and the second heat exchange medium outlet are arranged in the shell the first shell wall and/or the second shell wall of the housing.

Optionally, in the aforementioned gas-gas heat exchanger, the second heat exchange medium inlet is located at the first position of the casing, and the second heat exchange medium outlet is located at the second position of the casing, so The first position is farther from the first end of the housing than the second position.

Optionally, in the aforementioned gas-to-air heat exchanger, wherein the plate tubes are arranged side by side in multiples, the airflow distribution holes opened in each flow direction distribution plate are multiple, and the multiple plate tubes pass through each flow direction one by one. The distribution plate has multiple air distribution holes;

At least one inlet guide plate, disposed in the heat exchange space, opposite to the second heat exchange medium inlet; and/or, at least one outlet baffle plate, disposed in the heat exchange space, and the second heat exchange medium inlet; The heat exchange medium outlet is opposite.

Optionally, in the aforementioned gas-gas heat exchanger, there are a plurality of inlet guide plates, and each inlet guide plate includes: a first plate extending in the length direction of the cross section of the plate tube, a plurality of inlet guide plates The first plates of the plates are distributed in the extending direction of the plate tubes, and the fluids to the second heat exchange medium inlets are branched to different outer peripheries of the plate tubes.

Optionally, in the aforementioned gas-gas heat exchanger, wherein each inlet guide plate includes: a second plate extending in the extension direction of the plate tube, and the second plate of the plurality of inlet guide plates is located in the plate tube. distributed along the length of the section.

Optionally, in the aforementioned gas-gas heat exchanger, there are a plurality of outlet guide plates, and each outlet guide plate includes: a third plate extending in the extending direction of the plate tube, and a plurality of inlet guide plates The third plates are distributed along the length direction of the section of the plate tube, and the fluids on the outer periphery of the different plate tubes are guided to the second heat exchange medium outlet.

Optionally, in the aforementioned gas-to-air heat exchanger, wherein each outlet baffle plate includes: a fourth plate extending in the length direction of the cross section of the plate tube, and the fourth plate of the plurality of outlet baffle plates is located in the The plate tube is distributed in the extension direction.

Optionally, the aforementioned gas-to-gas heat exchanger further includes:

a first tube sheet and a second tube sheet;

The plate tubes are arranged side by side, and the first tube plate and the second tube plate are respectively provided with a plurality of tube connection ports; the first tube plate is arranged in the casing; the first tube plate is arranged in the casing; Two tube sheets are arranged in the casing, and in the casing, the heat exchange space is formed between the first tube sheet and the second tube sheet; the first ports of the plurality of sheet tubes are connected to the The plurality of tube connection ports of the first tube sheet are in a one-to-one sealing connection; the second ports of the plurality of sheet tubes are sealed and connected to the plurality of tube connection ports of the second tube sheet in a one-to-one correspondence.

Optionally, in the aforementioned gas-gas heat exchanger, the ratio of the length to the width of the section of the plate tube is greater than or equal to 5.

By the above technical solution, the gas-air heat exchanger provided by the technical solution of the present invention has at least the following advantages:

In the technical solution provided by the embodiment of the present invention, during heat exchange, the first heat exchange medium is introduced into the first heat exchange medium inlet, the first heat exchange medium enters the first heat exchange passage, and is introduced into the second heat exchange medium inlet The second heat exchange medium, the second heat exchange medium enters the second heat exchange passage, wherein the flow direction of at least two segment passages of the second heat exchange passage is limited by the positions of the distribution holes, so that the first heat exchange passage in the second heat exchange passage can be reduced. The phenomenon of bias flow and eddy current generated by the second heat exchange medium improves the heat exchange between the first heat exchange passage and the second heat exchange passage, so that the heat exchange efficiency of the heat exchanger is higher.

The above description is only an overview of the technical solutions of the present invention. In order to understand the technical means of the embodiments of the present invention more clearly, and to implement them according to the contents of the description, the preferred embodiments of the present invention and the accompanying drawings are described in detail below. .

Description of 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 for the purpose of illustrating preferred embodiments only and are not to be considered limiting of the invention. Also, the same components are denoted by the same reference numerals throughout the drawings. In the attached image:

1 is a schematic diagram of the internal structure of a gas-gas heat exchanger provided by an embodiment of the present invention;

Fig. 2 is the first kind of sectional schematic diagram of Fig. 1A-A;

3 is a schematic structural diagram of a flow distribution plate of the first gas-to-air heat exchanger provided by an embodiment of the present invention;

4 is a schematic cross-sectional structural diagram of a first plate tube of a gas-to-air heat exchanger provided by an embodiment of the present invention;

5 is a schematic cross-sectional structure diagram of a second type of plate tube of a gas-to-air heat exchanger provided by an embodiment of the present invention;

6 is a schematic cross-sectional structure diagram of a third type of plate tube of a gas-to-air heat exchanger provided by an embodiment of the present invention;

7 is a schematic cross-sectional structure diagram of a fourth plate tube of a gas-to-air heat exchanger provided by an embodiment of the present invention;

8 is a schematic structural diagram of a first inlet guide plate of an air-gas heat exchanger provided by an embodiment of the present invention;

9 is a schematic structural diagram of a second type of inlet guide plate of an air-gas heat exchanger provided by an embodiment of the present invention;

10 is a schematic structural diagram of a first outlet baffle plate of an air-to-air heat exchanger provided by an embodiment of the present invention;

11 is a schematic structural diagram of a second type of outlet guide plate of an air-to-air heat exchanger provided by an embodiment of the present invention;

Figure 12 is a second schematic cross-sectional view of Figure 1A-A;

13 is a schematic structural diagram of a flow distribution plate of a second gas-to-air heat exchanger provided by an embodiment of the present invention;

Figure 14 is a third schematic cross-sectional view of Figures 1A-A;

15 is a schematic structural diagram of a flow distribution plate of a third gas-to-air heat exchanger provided by an embodiment of the present invention;

Fig. 16 is the fourth kind of sectional schematic diagram of Fig. 1A-A;

FIG. 17 is a schematic structural diagram of a flow distribution plate of a fourth gas-to-air heat exchanger provided by an embodiment of the present invention.

Detailed ways

In order to further illustrate the technical means and effects adopted by the present invention to achieve the purpose of the predetermined embodiment of the invention, the following describes the specific implementation and structure of the gas-air heat exchanger proposed according to the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. , features and their effects are described in detail below. In the following description, different "an embodiment" or "embodiments" do not necessarily refer to the same embodiment. Furthermore, the particular features, structures, or characteristics in one or more embodiments may be combined in any suitable form.

1 to 3 show an embodiment of the gas-gas heat exchanger provided by the present invention. The flow direction of the first heat exchange medium is indicated by double dashed arrows in FIG. 1 , and the flow direction of the second heat exchange medium is indicated by solid line arrows in FIG. 1 . Referring to FIGS. 1 to 3 , an air-to-air heat exchanger proposed by an embodiment of the present invention includes: a casing 10 , a first heat exchange medium inlet 20 , a first heat exchange medium outlet 30 , a plate tube 40 , a second heat exchange medium The heat exchange medium inlet 50 , the second heat exchange medium outlet 60 and at least one flow direction distribution plate 70 .

The shell 10 has a heat exchange space inside; the cross 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 includes a first port and a second port that are connected to each other; The heat medium inlet 20 is arranged in the casing 10, the first heat exchange medium inlet 20 is connected to the first port of the plate tube 40; the first heat exchange medium outlet 30 is arranged in the casing 10, and the first heat exchange medium The outlet 30 communicates 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; The second heat exchange medium inlet 50 is arranged in the casing 10 , the second heat exchange medium inlet 50 communicates with the heat exchange space; the second heat exchange medium outlet 60 is arranged in the casing 10 , and the second heat exchange medium outlet 60 The heat exchange space is communicated, 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 direction is provided to the distribution plate 70 In the heat exchange space, at least one 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 a communication between the at least two segmented passages B. The airflow distribution hole 701.

During heat exchange, the first heat exchange medium is introduced into the first heat exchange medium inlet, the first heat exchange medium enters the first heat exchange passage, the second heat exchange medium is introduced into the second heat exchange medium inlet, and the second heat exchange medium is introduced into the second heat exchange medium inlet. The heat medium enters the second heat exchange passage, wherein the flow direction of at least two segment passages of the second heat exchange passage is limited by the positions of the distribution holes, so that the bias flow and eddy current generated by the second heat exchange medium in the second heat exchange passage can be reduced The phenomenon makes the second heat exchange medium in the second heat exchange passage flow evenly through the plate tube, improves the heat exchange between the first heat exchange passage and the second heat exchange passage, and makes the heat exchange efficiency of the heat exchanger higher.

The casing 10 includes a first end and a second end, the first heat exchange medium inlet 20 is disposed at the first end of the casing 10 , and the inlet end of the plate tube 40 faces the casing. 10 extends from the first end; the first heat exchange medium outlet 30 is provided at the second end of the shell 10, and the outlet end of the plate tube 40 extends toward the second end of the shell 10; the The shell 10 includes a first shell wall and a second shell wall located on both sides of the plate tube section in the longitudinal direction, and the second heat exchange medium inlet and the second heat exchange medium outlet are arranged on the shell side. The first shell wall and/or the second shell wall of the housing. 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 The heat exchange medium outlet can be simultaneously arranged on the second shell wall.

In other embodiments, the second heat exchange medium inlet 50 is disposed on the first shell wall, and the second heat exchange medium outlet 60 is disposed on the second shell wall. The second heat exchange medium inlet is located at a first position of the casing, the second heat exchange medium outlet is located at a second position of the casing, and the first position is farther from the second position than the second position. the first end of the housing. Inside the shell, the second heat exchange medium first flows into the shell in the length direction of the plate tube section, and then flows in the extension direction of the plate tube. The flow direction of the second heat exchange medium in the extension direction of the shell plate tube is the same as the first A heat exchange medium flows in the opposite direction in the plate tube to achieve high-efficiency countercurrent heat exchange, and finally flows out of the shell in the length direction of the shell plate tube section.

The section of the plate tube is flat. As shown in Figure 4, the section of the plate tube is a flat strip, and the ratio of the length L to the width W is L/W greater than or equal to 5. The heat transfer performance of the plate tube can be known from the heat transfer theory. It increases with the increase of the section length-width ratio L/W ratio. The larger the length-width 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 the length direction of the section of the plate tube.

The elongated section, in its specific implementation, the section can be a plane symmetrical figure, specifically, can be an ellipse, a straight bar, an oval, a rectangle, a dumbbell, a curved bar, a polygon, etc., such as the upper and lower sides. Sections that are wavy and mirror each other. Or, it is a plate tube extending along the central axis, and the cross section of the plate tube perpendicular to the longitudinal direction of the cross section is in an undulating shape. In the first embodiment, as shown in FIG. 4 , the two outer end faces of the elongated section in the length L direction are arc surfaces, and the two opposite outer end faces of the middle section of the elongated section in the length L direction are flat. As shown in FIG. 5 , the two outer end faces of the long L-direction of the elongated section are planes, the two opposite outer end faces of the middle section of the elongated section in the length L direction are planes, and the four corners of the elongated section are arcs Chamfered surface. In the second embodiment, the two outer end surfaces of the elongated section in the length L direction are arc surfaces, and the two opposite outer end surfaces of the middle section of the elongated section in the length L direction are curved surfaces that are curved in the same direction. In the third embodiment, the two outer end surfaces of the elongated section in the length L direction are circular arc surfaces, and the two opposite outer end surfaces of the middle section of the elongated section in the length L direction are oppositely curved curved surfaces. As shown in FIG. 6, the curved surface of the oppositely curved surface can be curved in order to change convex and concave in the length L direction of the cross section, or, as shown in FIG. .

The number of plate tubes is not limited to one, for example, as shown in FIG. 2 and FIG. 3 , the plate tubes 40 are arranged side by side in multiples, and each airflow distribution hole 701 opened to the distribution plate 70 is multiple. Each of the plate tubes 40 passes through each flow direction distribution plate 70 and a plurality of airflow distribution holes 701 one by one. In order to facilitate installation, in a specific implementation, as shown in FIG. 1 , the heat exchanger further includes: a first tube sheet 101 and a second tube sheet 102 , on the first tube sheet 101 and the second tube sheet 102 A plurality of pipe connection ports (not shown in the figure) are respectively provided; the first tube sheet 101 is arranged in the casing 10; the second tube sheet 102 is arranged in the casing 10, In the casing 10, the heat exchange space is formed between the first tube sheet 101 and the second tube sheet 102; The pipe connection ports are in a one-to-one correspondence sealing connection; the second ports of the plurality of plate tubes are sealed and connected with the plurality of pipe connection ports of the second tube sheet 102 in a one-to-one correspondence. The size of the tube connection port can be matched with the size of the plate tube section, so as to facilitate the sealing connection between the first port of the plate tube and the tube connection port of the first tube sheet, and the second port of the plate tube and the second tube sheet. The pipe connection port is sealed connection.

Among them, after the second heat exchange medium flows into the shell in the length direction of the plate tube section, it turns to the flow process in the extension direction of the plate tube in the shell, which is prone to bias flow and other phenomena, and it is difficult to realize the flow direction of the plate tube in the process of turning the flow direction. The uniform heat exchange further includes: at least one inlet guide plate 80 disposed in the heat exchange space opposite to the second heat exchange medium inlet 50 . In implementation, as shown in FIG. 8 , the inlet guide plate includes: a first plate 801 extending in the length direction of the section of the plate tube, the inlet guide plate is in the shape of a straight plate, and the first plate 801 can exchange heat with the second plate The inlet flow direction of the medium inlet is parallel, 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 tube, and the first plate 801 is provided with a through hole for penetrating the plate tube , the first plate 801 can guide the second heat exchange medium to flow to the plate tube for heat exchange. When there are multiple inlet guide plates, each inlet guide plate includes: a first plate extending in the length direction of the plate tube section, and the first plate of the plurality of inlet guide plates is in the extension direction of the plate tube Distributed upward, the fluid at the inlet of the second heat exchange medium is divided to different outer peripheries of the plate tubes, the first ends of the first plates of the plurality of inlet guide plates extend to the inlet of the second heat exchange medium, and the plurality of inlet guide plates The second end of the first plate extends to a different plate tube. Further, as shown in FIG. 1 and FIG. 9 , each inlet guide plate 80 includes: a second plate 802 extending in the extension direction of the plate tube of the casing, a plurality of second plates 802 of the inlet guide plates Distributed in the length direction of the plate tube section of the shell, the second plate 802 and the first plate 801 form an integral member, the inlet guide plate is in the shape of an inverted "L" shape, and the second plate 802 can be connected with the first plate 801. Vertical, so that the second heat exchange medium is uniformly led from the second heat exchange medium inlet to the space area where the plate tube is located, effectively eliminating the vortex area of the second heat exchange medium inlet and reducing the degree of bias flow of the second heat exchange medium. The rectification is carried out, so that the degree of counter-fluidization of the two heat exchange mediums in the second heat exchange medium inlet plate tube area is improved, and the heat exchange efficiency is improved. The plurality of inlet guide plates 80 are arranged in a stepped shape, so as to realize the guidance of the airflow direction. The plurality of inlet guide plates may be arranged in the second heat exchange passage in front of the first flow direction of the distribution plate in the second heat exchange medium flow direction. The widths of the first plate and the second plate are not limited, and it is easy to understand that the rods can be formed when the widths are narrow enough to a certain extent.

Among them, after the second heat exchange medium flows in the extension direction of the shell plate and tube, it turns to the flow process in the length direction of the section of the shell plate tube, which is prone to bias flow and other phenomena. The uniform heat exchange, further, as shown in FIG. 1 , further includes: at least one outlet guide plate 90 , which is arranged in the heat exchange space and is opposite to the second heat exchange medium outlet 60 . In implementation, as shown in FIG. 10 , the outlet baffle plate includes: a third plate 901 extending in the extending direction of the plate tube of the casing, the outlet baffle plate is in the shape of a straight plate, and the third plate 901 can be connected with the plate. The tube extension direction is parallel, the third plate 901 may be at the position where the second heat exchange medium outlet faces in the length direction of the plate tube section of the shell, and the plate surface of the third plate 901 is opposite to the second heat exchange medium outlet. When there are a plurality of outlet baffles, each outlet baffle includes: a third plate extending in the extension direction of the plate tube of the casing, and the third plate of the plurality of inlet baffles is in the plate tube of the casing. The cross section is distributed in the length direction, and the fluids on the outer periphery of different plates and tubes are guided to the second heat exchange medium outlet, and the third plates of the plurality of inlet guide plates extend to the second heat exchange medium in the extension direction of the plate tubes of the shell Different positions where the heat medium outlet faces. Further, as shown in FIG. 1 and FIG. 11 , each outlet baffle plate includes: a fourth plate 902 extending in the length direction of the plate tube section of the casing, and the fourth plate 902 is provided with holes for penetrating the plate tube The fourth plate 902 of the plurality of outlet baffles is distributed in the extension direction of the plate tube of the shell, the fourth plate 902 and the third plate 901 can form an integral member, and the outlet baffle is an “L” shaped plate The fourth plate 902 can be perpendicular to the third plate 901, so that the second heat exchange medium is evenly led from the plate tube area to the second heat exchange medium outlet, effectively eliminating the vortex area of the second heat exchange medium outlet and reducing the first heat exchange medium. The degree of bias flow of the second heat exchange medium and the flow field are rectified, so that the degree of counter-fluidization of the two heat exchange medium in the outlet plate and tube area of the second heat exchange medium is improved, and the heat exchange efficiency is improved. The plurality of outlet baffles 90 are arranged in a stepped shape, so as to guide the airflow direction. The plurality of outlet baffles may be arranged behind the last flow direction distribution plate in the second heat exchange passage in the second heat exchange medium flow direction. The widths of the third plate and the fourth plate are not limited, and it is easy to understand that the rods can be formed if the widths are narrow enough to a certain extent.

The flow distribution plate can be supported on the inner wall of the housing, or the flow distribution plate can be supported on the outer wall of the plate tube. In practice, the length of the plate tube is long, and when the flow rate of the heat exchange medium is fast, the long plate tube is prone to vibration. To this end, the flow direction 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 direction distribution plate can reinforce the plate tube and improve the stability of the heat exchanger.

The airflow distribution holes are located in the position, size, shape and quantity of the flow direction distribution plate. The number of airflow distribution holes in each flow direction distribution plate is not limited to one, and it is designed according to the specific conditions of the gas in the heat exchange space. For example, in some embodiments, the plate tube passes through the airflow distribution hole with a ventilation gap between the airflow distribution hole and the plate tube. The second heat exchange medium passes through the two sub-passages through the ventilation gap. During the process of passing through the ventilation gap, the second heat exchange medium is evenly distributed, and can generate efficient countercurrent heat exchange with the first medium in the plate tube, thereby improving the heat exchange of the heat exchanger. Thermal efficiency.

The way to realize the support of the flow direction distribution plate and the outer wall of the plate tube can be realized by using an air distribution hole, and the inner wall of the air distribution hole has at least two support parts supported by the outer wall of the plate tube, and the at least two support parts clamp the plate tube. outer wall. In some embodiments, the at least two support parts include a first support end and a second support end that support both ends of the section length direction of the plate tube.

For example, as shown in FIG. 12 and FIG. 13 , both the first support end and the second support end are card slots 701a recessed on the outside of the inner wall of the airflow distribution hole. The width of the hole 701 is larger than the width of the plate tube 40 , and a ventilation gap is formed between the hole wall of the airflow distribution hole 701 and the plate tube 40 .

Alternatively, as shown in FIG. 14 and FIG. 15 , at least part of the airflow distribution holes among the plurality of airflow distribution holes communicate with each other to form a combined airflow distribution hole 702 , and a ventilation gap can be formed between two adjacent plate tubes in the combined airflow distribution hole 702 . 40 The space between the outer walls.

Of course, the first support end and the second support end can also be first protrusions protruding from the inner wall of the air distribution hole.

Further, the at least two support parts may further include a third support end and a fourth support end at both ends of the cross-sectional width direction of the support plate tube.

For example, as shown in FIG. 3 , the third support end and the fourth support end may be second protrusions 701b protruding from the inner wall of the air distribution hole. Specifically, the first support end and the second support end can also be first protrusions 701c protruding from the inner wall of the airflow distribution hole. Alternatively, as shown in FIG. 16 and FIG. 17 , the third support end and the fourth support end may be second protrusions 701b protruding from the inner wall of the airflow distribution hole, and both the first support end and the second support end are recessed in The slot 701a on the outer side of the inner wall of the air distribution hole 701.

As shown in FIG. 1 , there may be at least two flow direction distribution plates 70 , and the at least two flow direction distribution plates 70 may be distributed over the length or width of the tube section of the shell plate. The greater the number of flow distribution plates 70, the more stable the adjusted flow distribution can be made.

The embodiments provided by the present invention have at least the following advantages:

1. High heat transfer efficiency.

a. The ratio of section length to width of the plate tube is not less than 5, and the section is a flat section. According to the theory of heat transfer, the heat transfer performance of the plate tube increases with the increase of the L/W ratio of the section length-width ratio, and the larger the length-width ratio is. , the higher the heat transfer efficiency;

b. A ventilation gap is formed between the flow distribution plate and the outer wall of the plate tube along the axis of the plate tube, and the flow direction from the first heat exchange medium inlet to the first heat exchange medium outlet is the same as that from the second heat exchange medium inlet to the second heat exchange medium. The flow direction of the outlet is arranged in the reverse direction, so as to form the first heat exchange medium and the first heat exchange medium countercurrent heat exchange process, improve the effective heat transfer temperature difference, and enhance the heat exchange effect;

c. The inlet guide plate set at the inlet area of the second heat exchange medium and the outlet guide plate set at the outlet area of the second heat exchange medium can effectively eliminate the eddy current area in the above two areas and reduce the degree of medium bias flow, and convection The field is rectified, so that the degree of counter-fluidization of the two heat exchange media is improved, and the heat exchange area and heat transfer effect of this area are enhanced.

2. Compact structure.

The larger the ratio L/W of the section length and width of the plate tube, the larger the plate and tube arrangement density, the larger the heat transfer area and the high heat transfer efficiency when the shell size is the same, so the structure is more compact when the heat transfer is the same. .

3. The medium turning elbow box required for the cross-flow heat exchange with multiple tubes is eliminated, and the processing and manufacturing are simple.

The heat exchange method of the gas-gas heat exchanger according to the above-mentioned embodiment of the present invention includes: passing a first heat exchange medium into the first heat exchange medium inlet, and passing a second heat exchange medium into the second heat exchange medium inlet The heat medium enables the first heat exchange medium in the first heat exchange passage in the plate tube to exchange heat with the second heat exchange medium in the second heat exchange passage outside the plate tube.

The first heat exchange medium after heat exchange flows out through the first heat exchange medium outlet in reverse heat exchange, and the second heat exchange medium after heat exchange flows out through reverse heat exchange through the second heat exchange medium outlet.

In the above-mentioned embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

It is to be understood that the relevant features in the above-mentioned apparatus may refer to each other. In addition, "first", "second", etc. in the above-mentioned embodiments are used to distinguish each embodiment, and do not represent the advantages and disadvantages of each embodiment.

In the description provided herein, numerous specific details are set forth. It will be 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 is to be understood that in the above description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together into a single embodiment, figure, or its description. However, this disclosed apparatus should not be construed as reflecting the intention 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.

It will be understood by those skilled in the art that the components of the apparatus in an embodiment can be adaptively changed and arranged in one or more apparatuses different from the embodiment. Components of the embodiments may be combined into one component, and furthermore they may be divided into subcomponents. All features disclosed in this specification (including accompanying claims, abstract and drawings) and all parts of any apparatus so disclosed may be combined in any combination, unless at least some of such features are mutually exclusive. Each feature disclosed in this specification (including 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 although some of the embodiments described herein include certain features, but not others, included in other embodiments, that combinations of features of different embodiments are intended to be within the scope of the invention within 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-described embodiments illustrate rather than limit the invention, and that alternative embodiments may be devised by those skilled in the art 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 component does not preclude the presence of a plurality of such components or components. The present invention can be implemented by means of an apparatus comprising several different components. In the claims enumerating several means, several of these means may be embodied by one and the same item of means. The use of the words first, second, and third, etc. do not denote any order. These words can be interpreted as names.

The above are only preferred embodiments of the present invention, and do not limit the present invention in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still belong to the present invention. within the scope of the technical solution of the 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.

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