Plate heat exchanger and heat exchange system for mine return air waste heat utilization

Abstract

The utility model discloses a plate heat exchanger for mine return air waste heat utilization and a heat exchange system. The plate heat exchanger comprises a heat exchange shell and heat exchange plates. The heat exchange shell is of a cubic structure, and a plurality of heat exchange plates are sequentially arranged in the heat exchange shell from top to bottom; each heat exchange plate comprises a center plate, a main baffle and a side baffle; the center plate is a rectangular plate body, the main baffles are arranged on the lower portions of the front side and the rear side of the center plate, and the side baffles are arranged on the upper portions of the left side and the right side of the center plate. Every two adjacent heat exchange plates are symmetrically arranged, the main baffles on the corresponding sides of every two adjacent heat exchange plates are connected, and the side baffles on the corresponding sides of every two adjacent heat exchange plates are connected. A heat source channel is formed in the front-back direction of the multiple heat exchange plates, and a cold source channel is formed in the left-right direction of the multiple heat exchange plates. The plate heat exchanger solves the problem that in the prior art, a plate heat exchanger used for mine return air waste heat utilization and used for a heat exchange system is inconvenient to disassemble and assemble.

Description

Technical Field

[0001] The present application belongs to the technical field of heat exchangers, and specifically relates to a plate heat exchanger and a heat exchange system for utilizing waste heat from mine return air. Background Art

[0002] According to the Coal Mine Safety Regulations, the air temperature below the air intake wellhead must be above 2°C. In winter, the temperature of mines in high-latitude areas is low. For example, in the main coal producing areas such as northern Shaanxi and Inner Mongolia, the winter temperature is as low as -20°C. The air temperature at the air intake wellhead cannot reach the temperature required by the regulations. In order to ensure safe production underground, it is necessary to heat the air intake flow in winter to achieve heat preservation and anti-freezing of the wellbore.

[0003] The plate heat exchanger used for mine return air waste heat utilization is a heat transfer device that can realize heat exchange between cold and hot fluids. It is widely used in various industries such as aerospace, petrochemical, refrigeration and cryogenics due to its high heat transfer efficiency, compact structure and low operating cost, and plays a huge role in industrial production. Therefore, in winter, coal mines will use plate heat exchangers for mine return air waste heat utilization to exchange heat with the air at the air inlet wellhead to increase the air temperature at the air inlet wellhead. However, in summer, the plate heat exchanger used for mine return air waste heat utilization needs to be disassembled, and most of the existing plate heat exchangers used for mine return air waste heat utilization are not easy to disassemble and assemble. Some of the plate heat exchangers used for mine return air waste heat utilization that are easy to disassemble and assemble have poor stability, so it is difficult to meet the existing coal mine use needs. Utility Model Content

[0004] The embodiments of the present application provide a plate heat exchanger and a heat exchange system for utilizing waste heat from mine return air, thereby solving the problem that the plate heat exchanger used in the heat exchange system for utilizing waste heat from mine return air in the prior art is difficult to disassemble and assemble.

[0005] In order to achieve the above-mentioned purpose, the embodiment of the utility model provides a plate heat exchanger for utilizing waste heat of mine return air, including a heat exchange shell and a heat exchange plate;

[0006] The heat exchange shell is a cubic structure, and a plurality of heat exchange plates are arranged in sequence from top to bottom in the heat exchange shell; the heat exchange plates include a center plate, a main baffle plate and a side baffle plate;

[0007] The central plate is a rectangular plate body, the main baffles are arranged at the lower parts of the front and rear sides of the central plate, and the side baffles are arranged at the upper parts of the left and right sides of the central plate;

[0008] Two adjacent heat exchange plates are symmetrically arranged, the main baffles on the corresponding sides of the two adjacent heat exchange plates are connected, and the side baffles on the corresponding sides of the two adjacent heat exchange plates are connected;

[0009] The front-to-back direction of the plurality of heat exchange plates forms a heat source channel, and the left-to-right direction of the plurality of heat exchange plates forms a cold source channel.

[0010] In a possible implementation, two adjacent main baffles or two adjacent side baffles are connected by a clip, the length of the clip is adapted to the length of the main baffle or the side baffle, and the upper and lower parts of the clip are provided with clip grooves, and the end of the main baffle or the end of the side baffle is inserted into the clip groove.

[0011] In a possible implementation, the main baffle plate and the side baffle plate are both disposed perpendicularly to the central plate, or the main baffle plate and the side baffle plate are both disposed at an acute angle to the central plate.

[0012] In a possible implementation, the main baffle plate and the side baffle plate are both arranged perpendicular to the center plate, and connecting holes are provided on the main baffle plate and the side baffle plate. Two adjacent main baffle plates or two adjacent side baffle plates are connected by a bolt assembly.

[0013] In a possible implementation, the main baffle plate and the side baffle plate are both arranged at an acute angle to the center plate, and a connecting section is provided at the ends of two adjacent main baffle plates or two adjacent side baffle plates. The connecting section is horizontally arranged, and the connecting sections of two adjacent main baffle plates are connected, and the connecting sections of two adjacent side baffle plates are connected.

[0014] In a possible implementation manner, an end portion of the connecting section is connected to an inner wall of the heat exchange shell via a mounting bracket.

[0015] In a possible implementation, a plurality of long grooves are arranged at intervals on the central plate, the long grooves are arranged along the front-rear direction of the central plate, and the groove bottoms of the plurality of long grooves extend into the heat source channel;

[0016] A plurality of circular grooves are arranged on the central plate between the long grooves, and the groove bottoms of the plurality of circular grooves extend into the cold source channel.

[0017] In a possible implementation, two adjacent center plates abut against each other at a position where the long groove is provided, and two adjacent center plates abut against each other at a position where the circular groove is provided.

[0018] The embodiment of the utility model provides a heat exchange system, which adopts the above-mentioned plate heat exchanger for utilizing waste heat of mine return air;

[0019] The plate heat exchanger used for utilizing waste heat from mine return air is installed at the intersection of the return air channel and the air inlet channel of the coal mine. The heat source channel is connected to the air inlet channel, and the cold source channel is connected to the return air channel. The cross-sectional area of ​​the cold source channel is 1.5 to 2.5 times that of the hot source channel.

[0020] One or more technical solutions provided in the embodiments of the present utility model have at least the following technical effects or advantages:

[0021] The embodiment of the utility model provides a plate heat exchanger and heat exchange system for utilizing waste heat of return air in a mine. When the heat exchanger is in use, the heat exchange shell is assembled and spliced ​​by a plurality of steel frame plates for easy disassembly and assembly. The heat exchange plate is an integrated plate structure, and the main baffle and the side baffle are both formed by cutting and folding. After the hot air passes through the heat source channel, the upper and lower center plates thereof are heated up, and after the cold air passes through the cold source channel, the upper and lower center plates thereof are cooled down, thereby achieving the purpose of heat exchange. The length and width of the cubic structure are determined according to actual needs to achieve different installation structures and heat exchange requirements. The plate heat exchanger for utilizing waste heat of return air in the utility model is simple in structure and easy to install. When the plate heat exchanger for utilizing waste heat of return air in the mine is not in use, it is also easy to disassemble, thereby meeting the different use requirements of coal mines in winter and summer. In this embodiment, the cross-sectional area of ​​the cold source channel is twice the cross-sectional area of ​​the heat source channel, and the depth of the long groove is twice the depth of the round groove. Thereby meeting the actual application requirements that the return air volume of the coal mine is greater than the intake air volume, and ensuring the heat exchange effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 This is a schematic structural diagram of a plate heat exchanger for utilizing waste heat from mine return air provided in Example 1 of the utility model.

[0024] Figure 2 for Figure 1 Right view of .

[0025] Figure 3 This is a cross-sectional view of the connection state of multiple heat exchange plates provided in Example 1 of the utility model.

[0026] Figure 4 This is a schematic diagram of the structure of the heat exchange plate provided in Example 1 of the utility model.

[0027] Figure 5This is a schematic structural diagram of a plate heat exchanger for utilizing waste heat from mine return air provided in the second embodiment of the utility model.

[0028] Figure 6 for Figure 5 Right view of .

[0029] Figure 7 This is a schematic diagram of the installation of the clamping member provided in the second embodiment of the utility model.

[0030] Figure 8 This is a schematic diagram of the structure of the clamping member provided in the second embodiment of the utility model.

[0031] Fig. 9 This is a schematic diagram of the structure of the heat exchange plate provided in Example 2 of the utility model.

[0032] Fig.10 for Fig. 9 Top view of the .

[0033] Fig.11 for Fig. 9 sectional view of .

[0034] Fig.12 This is a schematic diagram of the installation of the clamping member provided in the third embodiment of the present utility model.

[0035] Figure numerals: 1-heat exchange shell; 2-heat exchange plate; 3-center plate; 4-main baffle; 5-side baffle; 6-heat source channel; 7-cold source channel; 8-clamping piece; 9-clamping groove; 10-connecting section; 11-long groove; 12-circular groove. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] In the description of the embodiments of the present utility model, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limitations on the present utility model. The terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to the specific circumstances.

[0038] like Figures 1 to 12 As shown, the plate heat exchanger for utilizing waste heat of mine return air provided by the embodiment of the utility model comprises a heat exchange shell 1 and a heat exchange plate 2.

[0039] The heat exchange shell 1 is a cubic structure, and a plurality of heat exchange plates 2 are sequentially arranged from top to bottom in the heat exchange shell 1. The heat exchange plates 2 include a center plate 3, a main baffle plate 4 and a side baffle plate 5.

[0040] The center plate 3 is a rectangular plate body. Main baffles 4 are disposed at the lower parts of both the front and rear sides of the center plate 3 , and side baffles 5 are disposed at the upper parts of both the left and right sides of the center plate 3 .

[0041] Two adjacent heat exchange plates 2 are symmetrically arranged, the main baffles 4 on the corresponding sides of the two adjacent heat exchange plates 2 are connected, and the side baffles 5 on the corresponding sides of the two adjacent heat exchange plates 2 are connected.

[0042] A heat source channel 6 is formed in the front-to-back direction of the plurality of heat exchange plates 2 , and a cold source channel 7 is formed in the left-to-right direction of the plurality of heat exchange plates 2 .

[0043] It should be noted that the heat exchange shell 1 is assembled and spliced ​​by a plurality of steel frame plates to facilitate assembly and disassembly. The heat exchange plate 2 is an integrated plate structure, and the main baffle 4 and the side baffle 5 are both formed by cutting and folding. After the hot air passes through the heat source channel 6, the upper and lower center plates 3 are heated up, and after the cold air passes through the cold source channel 7, the upper and lower center plates 3 are cooled down, thereby achieving the purpose of heat exchange. The length and width of the cubic structure are determined according to actual needs to achieve different installation structures and heat exchange requirements. The plate heat exchanger for mine return air waste heat utilization of the utility model has a simple structure and is easy to install. When the plate heat exchanger for mine return air waste heat utilization is not in use, it is also easy to disassemble, thereby meeting the different usage requirements of coal mines in winter and summer.

[0044] In the first embodiment, the main baffle plate 4 and the side baffle plate 5 are arranged at an acute angle with the center plate 3, and a connecting section 10 is provided at the ends of two adjacent main baffle plates 4 or two adjacent side baffle plates 5. The connecting section 10 is arranged horizontally, and the connecting sections 10 of two adjacent main baffle plates 4 are connected, and the connecting sections 10 of two adjacent side baffle plates 5 are connected.

[0045] It should be noted that the heat exchange plate 2 in this state can reduce the wind resistance of the heat exchanger to the minimum, and the two connecting sections 10 can be connected by welding, bolt assembly, clamping, etc.

[0046] In the first embodiment, the end of the connecting section 10 is connected to the inner wall of the heat exchange shell 1 through a mounting bracket.

[0047] It should be noted that the heat exchange plate 2 of this embodiment has low stability, and therefore needs to be fixed by a mounting bracket to improve the stability of the heat exchange plate 2. The mounting bracket structure is a prior art, and this embodiment will not be further described.

[0048] In the second or third embodiment, two adjacent main baffles 4 or two adjacent side baffles 5 are connected by a clip 8, the length of the clip 8 is adapted to the length of the main baffle 4 or the side baffle 5, and the upper and lower parts of the clip 8 are provided with clip grooves 9, and the end of the main baffle 4 or the end of the side baffle 5 is inserted into the clip groove 9.

[0049] It should be noted that the main baffle 4 or the side baffle 5 is connected by the clamping member 8, which can facilitate the removal and installation of the heat exchange plate 2. Both ends of the clamping member 8 extend to both ends of the heat exchange shell 1.

[0050] In this embodiment, the main baffle plate 4 and the side baffle plate 5 are both arranged perpendicular to the central plate 3 or the main baffle plate 4 and the side baffle plate 5 are both arranged at an acute angle to the central plate 3 .

[0051] It should be noted that in the second embodiment, the main baffle plate 4 and the side baffle plate 5 are both arranged perpendicular to the central plate 3, and the cross section of the clamping member 8 is an H-shaped structure, which can have good stability.

[0052] In the third embodiment, the main baffle plate 4 and the side baffle plate 5 are arranged at an acute angle with the center plate 3, which can reduce wind resistance. The cross-section of the clamping member 8 is an overall <-shaped structure. In this structural state, the end of the clamping member 8 abuts against the inner wall of the heat exchange shell 1, thereby ensuring the stability of the heat exchange plate 2.

[0053] In this embodiment, the main baffle plate 4 and the side baffle plate 5 are both arranged perpendicular to the center plate 3, and connecting holes are provided on the main baffle plate 4 and the side baffle plate 5. Two adjacent main baffle plates 4 or two adjacent side baffle plates 5 are connected by a bolt assembly.

[0054] It should be noted that the bolt assembly includes nuts, bolts and washers. The connection holes can be arranged in multiple rows, so as to facilitate the adjustment of the distance between two adjacent center plates 3 and achieve the purpose of adjusting the channel cross-sectional area of ​​the heat source channel 6 or the cold source channel 7.

[0055] In this embodiment, a plurality of long grooves 11 are arranged at intervals on the center plate 3 . The long grooves 11 are arranged along the front-to-back direction of the center plate 3 , and the groove bottoms of the plurality of long grooves 11 extend into the heat source channel 6 .

[0056] A plurality of circular grooves 12 are arranged between the long grooves 11 on the center plate 3 , and the groove bottoms of the plurality of circular grooves 12 extend into the cold source channel 7 .

[0057] It should be noted that both the long groove 11 and the round groove 12 can increase the heat exchange area of ​​the center plate 3, thereby improving the heat exchange efficiency. Both the long groove 11 and the round groove 12 are made by stamping.

[0058] In this embodiment, two adjacent center plates 3 abut against each other at the position where the long groove 11 is provided, and two adjacent center plates 3 abut against each other at the position where the circular groove 12 is provided.

[0059] It should be noted that the abutting installation method of this embodiment can not only fully utilize the long groove 11 and the circular groove 12 to achieve higher heat exchange efficiency, but also improve the stability of the middle part of the center plate 3 to avoid the middle part of the center plate 3 from being concave due to extension.

[0060] The embodiment of the utility model also provides a heat exchange system, which adopts the above-mentioned plate heat exchanger for utilizing waste heat of mine return air.

[0061] The plate heat exchanger used for utilizing waste heat from mine return air is arranged at the intersection of the return air channel and the air inlet channel of the coal mine. The heat source channel 6 is connected to the air inlet channel, and the cold source channel 7 is connected to the return air channel. The cross-sectional area of ​​the cold source channel 7 is 1.5 to 2.5 times the cross-sectional area of ​​the heat source channel 6.

[0062] It should be noted that in this embodiment, the cross-sectional area of ​​the cold source channel 7 is twice that of the hot source channel 6, and the depth of the long groove 11 is twice that of the circular groove 12. This satisfies the actual application requirement that the return air volume of the coal mine is greater than the intake air volume, and ensures the heat exchange effect.

[0063] In this embodiment, it is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiment, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiment should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and therefore it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

Claims

1. A plate heat exchanger for utilizing waste heat from mine return air, characterized in that: It comprises a heat exchange shell (1) and a heat exchange plate (2); The heat exchange shell (1) is a cubic structure, and a plurality of heat exchange plates (2) are arranged in sequence from top to bottom in the heat exchange shell (1); the heat exchange plates (2) include a center plate (3), a main baffle plate (4) and a side baffle plate (5); The central plate (3) is a rectangular plate body, the main baffles (4) are arranged at the lower parts of the front and rear sides of the central plate (3), and the side baffles (5) are arranged at the upper parts of the left and right sides of the central plate (3); Two adjacent heat exchange plates (2) are symmetrically arranged, the main baffles (4) on the corresponding sides of the two adjacent heat exchange plates (2) are connected, and the side baffles (5) on the corresponding sides of the two adjacent heat exchange plates (2) are connected; The front-to-back direction of the plurality of heat exchange plates (2) forms a heat source channel (6), and the left-to-right direction of the plurality of heat exchange plates (2) forms a cold source channel (7).

2. The plate heat exchanger for utilizing waste heat from mine return air according to claim 1 is characterized in that: Two adjacent main baffles (4) or two adjacent side baffles (5) are connected by a clamping piece (8), the length of the clamping piece (8) is adapted to the length of the main baffle (4) or the side baffle (5), and the upper and lower parts of the clamping piece (8) are both provided with clamping grooves (9), and the end of the main baffle (4) or the end of the side baffle (5) is inserted into the clamping groove (9).

3. The plate heat exchanger for utilizing waste heat from mine return air according to claim 2 is characterized in that: The main baffle plate (4) and the side baffle plate (5) are both arranged perpendicularly to the central plate (3), or the main baffle plate (4) and the side baffle plate (5) are both arranged at an acute angle to the central plate (3).

4. The plate heat exchanger for utilizing waste heat from mine return air according to claim 1 is characterized in that: The main baffle plate (4) and the side baffle plate (5) are both arranged perpendicularly to the center plate (3); the main baffle plate (4) and the side baffle plate (5) are both provided with connection holes; two adjacent main baffle plates (4) or two adjacent side baffle plates (5) are connected by a bolt assembly.

5. The plate heat exchanger for utilizing waste heat from mine return air according to claim 1 is characterized in that: The main baffle (4) and the side baffle (5) are both arranged at an acute angle with the center plate (3); ends of two adjacent main baffles (4) or two adjacent side baffles (5) are provided with connecting sections (10); the connecting sections (10) are arranged horizontally; the connecting sections (10) of two adjacent main baffles (4) are connected to each other, and the connecting sections (10) of two adjacent side baffles (5) are connected to each other.

6. The plate heat exchanger for utilizing waste heat from mine return air according to claim 5 is characterized in that: The end of the connecting section (10) is connected to the inner wall of the heat exchange shell (1) via a mounting bracket.

7. The plate heat exchanger for utilizing waste heat from mine return air according to any one of claims 2 or 4, characterized in that: A plurality of long grooves (11) are arranged at intervals on the central plate (3), the long grooves (11) are arranged along the front-rear direction of the central plate (3), and the groove bottoms of the plurality of long grooves (11) extend into the heat source channel (6); A plurality of circular grooves (12) are arranged between the long grooves (11) on the central plate (3), and the groove bottoms of the plurality of circular grooves (12) extend into the cold source channel (7).

8. The plate heat exchanger for utilizing waste heat from mine return air according to claim 7 is characterized in that: Two adjacent center plates (3) abut against each other at the position where the long groove (11) is provided, and two adjacent center plates (3) abut against each other at the position where the circular groove (12) is provided.

9. A heat exchange system, characterized in that: Using the plate heat exchanger for utilizing waste heat from mine return air as claimed in claim 8; A plate heat exchanger for utilizing waste heat from mine return air is arranged at the intersection of a return air channel and an inlet air channel of a coal mine, wherein a heat source channel (6) is connected to the inlet air channel, and a cold source channel (7) is connected to the return air channel, wherein the cross-sectional area of ​​the cold source channel (7) is 1.5 to 2.5 times the cross-sectional area of ​​the heat source channel (6).

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