Mine return air heat taking and inlet air heating system

Abstract

The utility model belongs to the technical field of mine return air waste heat utilization, and particularly relates to a mine return air heat taking and inlet air heating system. The system comprises a heat pipe heat exchange device, a return air inlet device, a return air outlet air duct, a fresh air outlet device and a fresh air inlet air duct. The heat pipe heat exchange device comprises a heat pipe longitudinal flow equalizing grating, a gravity heat pipe and a heat pipe transverse flow equalizing grating. The heat pipe longitudinal flow equalizing grating, the gravity heat pipe and the heat pipe transverse flow equalizing grating are all vertically arranged and are sequentially arranged in the horizontal direction. The heat pipe heat exchange device is divided into an upper section and a lower section in the vertical direction, the upper section is a fresh air section, and the lower section is an air return section. One end of the return air section is connected with a return air inlet device, and the other end communicates outdoors through a return air outlet duct; the end, close to the return air outlet duct, of the fresh air section communicates with the outside through the fresh air inlet duct, and the other end is connected with the fresh air outlet device. According to the system, the air chamber design and the flow field distribution are optimized, so that the heat exchange efficiency is improved, and the energy consumption is reduced.

Description

Technical Field

[0001] This application belongs to the field of mine return air waste heat utilization technology, specifically relating to a mine return air heat extraction and intake air heating system. Background Technology

[0002] Mine return air is characterized by high humidity, large flow rate, and constant temperature, making it suitable for direct waste heat recovery and intake air heating. However, in traditional gravity heat pipe heat exchange systems, the large width of the heat exchange chamber and the non-uniformity of the chamber design and flow field distribution prevent heat from being transferred evenly and effectively to the heat pipe surface. Some heat pipes fail to fully utilize their heat exchange function, and even localized overheating or decreased heat exchange efficiency occurs. This non-uniform flow field not only significantly reduces the overall thermal efficiency of the system but also increases energy consumption, affecting the system's economy and reliability. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related technologies, namely, the low overall thermal efficiency and high energy consumption of gravity heat pipe heat exchange systems.

[0004] In view of this, the present invention provides a mine return air heat extraction and intake air heating system. This system optimizes the design of the air chamber and the flow field distribution to ensure that the heat flow can be uniformly and effectively transferred to the surface of the heat pipe, thereby improving the heat exchange efficiency and reducing energy consumption.

[0005] Specifically, the following technical solutions are included:

[0006] According to an embodiment of this application, a mine return air heat extraction and intake air heating system is provided, including a heat pipe heat exchange device, a return air inlet device, a return air outlet duct, a fresh air outlet device, and a fresh air inlet duct.

[0007] The heat pipe heat exchange device includes a longitudinal flow equalization grid for the heat pipe, a gravity heat pipe, and a transverse flow equalization grid for the heat pipe. The longitudinal flow equalization grid, the gravity heat pipe, and the transverse flow equalization grid for the heat pipe are all vertically arranged and sequentially along the horizontal direction. The heat pipe heat exchange device is divided into upper and lower sections along the vertical direction, with the upper section being the fresh air section and the lower section being the return air section. One end of the return air section is connected to the return air inlet device, and the other end is connected to the outside through the return air outlet duct. One end of the fresh air section near the return air outlet duct is connected to the outside through the fresh air inlet duct, and the other end is connected to the fresh air outlet device.

[0008] Furthermore, the number of gravity heat pipes is at least three, and an inspection channel is provided between every two adjacent gravity heat pipes.

[0009] Furthermore, the ratio of the length of each gravity heat pipe to the width of the plurality of gravity heat pipes arranged is less than or equal to 1.2.

[0010] Furthermore, the gravity heat pipe comprises four rows of heat pipes.

[0011] Furthermore, the density of the longitudinal flow equalization grid and the transverse flow equalization grid of the heat pipe is adjustable.

[0012] Furthermore, the return air inlet device includes a return air fan, a conversion structure, and a return air inlet duct; the conversion structure connects the return air fan and the return air inlet duct; the end of the return air inlet duct away from the conversion structure is connected to the return air section.

[0013] Furthermore, the conversion structure includes a transversely arranged conversion channel, a damper, and a transmission component; the conversion channel has a rectangular cross-section, with one end connected to the return air fan and the other end connected to the outside through a diffuser; an opening for connecting the return air inlet duct is provided at the top of the conversion channel; the opening is rectangular along the length of the conversion channel, and the side length of the opening parallel to the length of the conversion channel is greater than the longitudinal side length of the cross-section of the conversion channel, while the side length of the opening perpendicular to the length of the conversion channel is equal to the transverse side length of the cross-section of the conversion channel; the damper is disposed on the opening and conforms to the shape of the opening; the end of the damper away from the return air fan is rotatably connected to the corresponding side of the opening, and the end closer to the return air fan is connected to the transmission component.

[0014] Furthermore, there are two return air fans and two conversion structures, and the two return air fans are connected to the two conversion structures in a one-to-one correspondence.

[0015] Furthermore, the fresh air outlet device includes a fresh air fan and a fresh air outlet duct; the inlet end of the fresh air fan is connected to the fresh air section, and the outlet end is connected to the wellhead room through the fresh air outlet duct.

[0016] Furthermore, there are two fresh air fans and two fresh air outlet ducts, and the two fresh air fans are connected to the two fresh air outlet ducts in a one-to-one correspondence.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects:

[0018] This application addresses the problem of low heat exchange efficiency caused by uneven flow field during heat extraction and release in high-flow-rate gravity heat pipes by incorporating longitudinal and transverse flow equalization grids within the heat pipe heat exchange device. It also solves the problem of high energy consumption by optimizing the connection design between the heat pipe heat exchange device and the return and fresh air ducts. Furthermore, it overcomes the challenge of icing of standby fans caused by ventilation backflow during winter heating. Therefore, by optimizing the air chamber design and flow field distribution, this application ensures that heat flow is uniformly and effectively transferred to the heat pipe surface, thereby significantly improving the heat exchange efficiency of the heat pipe and reducing energy consumption. Attached Figure Description

[0019] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. In the drawings:

[0020] Figure 1 This is a schematic diagram of the structure of an embodiment of this application;

[0021] Figure 2 This is a schematic diagram of the heat pipe heat exchange device according to an embodiment of this application;

[0022] Figure 3 This is a schematic diagram of the structure of the switching structure damper when it is closed, according to an embodiment of this application.

[0023] Figure 4 This is a schematic diagram of the structure of the conversion structure damper when it is open, according to an embodiment of this application.

[0024] The reference numerals in the attached figures are as follows:

[0025] 1-Heat pipe heat exchanger; 11-Heat pipe longitudinal flow equalization grid; 12-Gravity heat pipe; 13-Heat pipe transverse flow equalization grid; 14-Maintenance passage; 15-Fresh air section; 16-Return air section;

[0026] 2-Return air inlet device; 21-Return air fan; 22-Conversion structure; 221-Conversion channel; 222-Damper; 223-Transmission component; 224-Opening; 225-Diffuser; 23-Return air inlet duct; 24-Return air outlet duct;

[0027] 3-Fresh air outlet device; 31-Fresh air fan; 32-Fresh air outlet duct; 33-Fresh air inlet duct;

[0028] 4-Wellhead Room. Detailed Implementation

[0029] To better understand the above technical solutions, the technical solutions of the embodiments of this application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments of this application and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this application, rather than limitations on the technical solutions of this application. In the absence of conflict, the embodiments of this application and the technical features in the embodiments can be combined with each other.

[0030] In view of this, an embodiment of this application provides a mine return air heat extraction and intake air heating system, such as... Figure 1 , Figure 2 As shown, the device includes a heat pipe heat exchanger 1, a return air inlet device 2, a return air outlet duct 24, a fresh air outlet device 3, and a fresh air inlet duct 33. The heat pipe heat exchanger 1 includes a longitudinal heat pipe equalization grid 11, a gravity heat pipe 12, and a transverse heat pipe equalization grid 13. The longitudinal heat pipe equalization grid 11, the gravity heat pipe 12, and the transverse heat pipe equalization grid 13 are all vertically arranged and sequentially arranged in the horizontal direction. The heat pipe heat exchanger 1 is divided into upper and lower sections in the vertical direction, with the upper section being the fresh air section 15 and the lower section being the return air section 16. One end of the return air section 16 is connected to the return air inlet device 2, and the other end is connected to the outside through the return air outlet duct 24. One end of the fresh air section 15 near the return air outlet duct 24 is connected to the outside through the fresh air inlet duct 33, and the other end is connected to the fresh air outlet device 3.

[0031] In specific operating conditions, after the return air enters the return air section 16 of the heat pipe heat exchanger 1 through the return air inlet device 2, it first passes through the longitudinal flow equalization grid 11 of the heat pipe to achieve a uniform distribution of flow velocity within the heat pipe heat exchanger 1; then it passes through the gravity heat pipe 12 and the transverse flow equalization grid 13 of the heat pipe to further ensure the uniformity of flow velocity within the heat pipe heat exchanger 1; after heat exchange is completed, the return air is discharged outdoors through the return air outlet duct 24. At the same time, the outdoor fresh air, under the action of the fresh air outlet device 3, enters the fresh air section 15 of the heat pipe heat exchanger 1 through the fresh air inlet duct 33, passes through the transverse flow equalization grid 13 of the heat pipe, the gravity heat pipe 12 and the longitudinal flow equalization grid 11 of the heat pipe in sequence to complete heat exchange, and is sent to the wellhead room 4 that needs heating through the fresh air outlet device 3.

[0032] Furthermore, in one embodiment, such as Figure 2As shown, there are at least three gravity heat pipes 12, and a maintenance channel 14 is provided between every two adjacent gravity heat pipes 12. Specifically, the multiple gravity heat pipes 12 can ensure more complete heat exchange and higher heat exchange efficiency of the heat pipe heat exchange device 1. The maintenance channel 14 is provided for the routine maintenance of the gravity heat pipes 12, and the height of the maintenance channel 14 is greater than or equal to 1.8m and the width is less than or equal to 0.35m to ensure the normal progress of maintenance work.

[0033] Furthermore, in one embodiment, the ratio of the length of each gravity heat pipe 12 to the width of the plurality of gravity heat pipes 12 arranged together is less than or equal to 1.2. Specifically, conventional heat pipe heat exchange devices typically have an aspect ratio exceeding 2.0 and lack a flow equalization structure, resulting in an uneven flow field distribution within the device, causing approximately 20% of the heat pipes to fail to achieve effective heat exchange. This application significantly improves the heat exchange efficiency of heat pipes by reducing the aspect ratio of the heat pipe heat exchange device.

[0034] Furthermore, in one embodiment, the gravity heat pipe 12 comprises four rows of heat pipes.

[0035] Furthermore, in one embodiment, the densities of the longitudinal flow equalization grid 11 and the transverse flow equalization grid 13 of the heat pipe are adjustable. Specifically, the densities of the longitudinal flow equalization grid 11 and the transverse flow equalization grid 12 of the heat pipe can be adjusted manually or automatically, thereby maximizing the uniform distribution of flow velocity within the heat pipe heat exchange device 1 under different operating conditions.

[0036] Furthermore, in one embodiment, such as Figure 1 As shown, the return air inlet device 2 includes a return air fan 21, a conversion structure 22, and a return air inlet duct 23; the conversion structure 22 connects the return air fan 21 and the return air inlet duct 23; the end of the return air inlet duct 23 away from the conversion structure 22 is connected to the return air section 16. In specific operating conditions, return air enters the conversion structure 22 under the action of the return air fan 21, and then enters the return air section 16 of the heat pipe heat exchange device 1 through the return air inlet channel 23.

[0037] Furthermore, in one embodiment, such as Figure 3 , Figure 4As shown, the conversion structure 22 includes a transversely arranged conversion channel 221, a damper 222, and a transmission component 223; the conversion channel 221 has a rectangular cross-section, and one end of the conversion channel 221 is connected to the return air fan 21, while the other end is connected to the outside through a diffuser 225; an opening 224 for connecting to the return air inlet duct 23 is provided at the top of the conversion channel 221; the opening 224 is rectangular along the length of the conversion channel 221, and the opening 224 is parallel to the conversion channel 221. The side length of the conversion channel 221 in the length direction is greater than the longitudinal side length of the cross-section of the conversion channel 221, and the side length of the opening 224 perpendicular to the length direction of the conversion channel 221 is equal to the transverse side length of the cross-section of the conversion channel 221; the damper 222 is disposed on the opening 224 and is adapted to the shape of the opening 224; the end of the damper 222 away from the return air fan 21 is rotatably connected to the corresponding side of the opening 224, and the end closer to the return air fan 21 is connected to the transmission component 223.

[0038] In specific operating conditions, when the system is not in operation during the non-heating season, such as Figure 3 As shown, the transmission component 223 lifts the damper 222, causing it to completely cover the opening 224. At this time, the conversion channel 221 is disconnected from the return air inlet duct 23. Return air enters the conversion channel 211 under the action of the return air fan 21, and is then discharged outdoors through the diffuser 225. After the system is put into operation during the heating season, as... Figure 4 As shown, the transmission component 223 releases the damper 222, and one end of the damper 222 connected to the transmission component 223 falls to the bottom of the conversion channel 221 under the action of gravity. At this time, the damper 222 cuts off the passage between the conversion channel 221 and the diffuser 225, and the opening 224 opens to connect the conversion channel 221 with the return air inlet duct 23. Return air enters the conversion channel 211 under the action of the return air fan 21, and then enters the heat pipe heat exchanger 1 through the return air inlet duct 23. The return air fan 21 and the conversion channel 221, the conversion channel 221 and the return air inlet duct 23, and the conversion channel 221 and the diffuser 225 are all connected by flexible connections.

[0039] Furthermore, in one embodiment, there are two return air fans 21 and two conversion structures 22, with each return air fan 21 connected to one of the two conversion structures 22. In specific operating conditions, two return air fans 21 are provided to ensure uninterrupted operation when one machine fails. Therefore, this application provides two independent conversion structures 22. When the first return air fan is in operation, the first damper in the corresponding first conversion structure is opened, and the second damper in the second conversion structure corresponding to the second return air fan in standby mode remains closed. Therefore, after the return air enters the return air inlet duct 23, it cannot be returned to the second conversion structure through the second damper, thus causing the second return air fan to freeze and creating a safety hazard.

[0040] Furthermore, in one embodiment, such as Figure 1 As shown, the fresh air outlet device 3 includes a fresh air fan 31 and a fresh air outlet duct 32. The inlet end of the fresh air fan 31 is connected to the fresh air section 15, and the outlet end is connected to the wellhead room 4 through the fresh air outlet duct 32. Specifically, outdoor fresh air enters the fresh air section 15 of the heat pipe heat exchange device 1 through the fresh air inlet duct 33 under the action of the fresh air fan 31, and after being heated, it is sent to the wellhead room 4, which needs heating, through the fresh air outlet duct 32. In a specific embodiment, in order to minimize the loss of fresh air heat, the duct of the fresh air outlet duct 32 adopts a circular structure, with an internal hub support and an external rubber and plastic insulation layer with a thickness of not less than 50mm.

[0041] Furthermore, in one embodiment, there are two fresh air fans 31 and two fresh air outlet ducts 32, with each of the two fresh air fans 31 connected to one of the two fresh air outlet ducts 32. Specifically, providing two independent sets of fresh air outlet devices 3 ensures that a backup device can operate uninterruptedly when one device fails.

[0042] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0043] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A mine return air heat extraction and intake air heating system, characterized in that, It includes a heat pipe heat exchange device (1), a return air inlet device (2), a return air outlet duct (24), a fresh air outlet device (3), and a fresh air inlet duct (33); The heat pipe heat exchange device (1) includes a longitudinal flow equalization grid (11), a gravity heat pipe (12), and a transverse flow equalization grid (13); The longitudinal flow equalization grid (11), the gravity heat pipe (12), and the transverse flow equalization grid (13) of the heat pipe are all vertically arranged and arranged in sequence along the horizontal direction; The heat pipe heat exchange device (1) is divided into two sections in the vertical direction, with the upper section being the fresh air section (15) and the lower section being the return air section (16). One end of the return air section (16) is connected to the return air inlet device (2), and the other end is connected to the outside through the return air outlet duct (24); The fresh air section (15) is connected to the outside through the fresh air inlet duct (33) at one end near the return air outlet duct (24), and the other end is connected to the fresh air outlet device (3).

2. The mine return air heat extraction and intake air heating system according to claim 1, characterized in that, The number of gravity heat pipes (12) is at least three, and an inspection channel (14) is provided between every two adjacent gravity heat pipes (12).

3. The mine return air heat extraction and intake air heating system according to claim 2, characterized in that, The ratio of the length of each gravity heat pipe (12) to the width of the arrangement of the plurality of gravity heat pipes (12) is less than or equal to 1.

2.

4. The mine return air heat extraction and intake air heating system according to claim 1, characterized in that, The gravity heat pipe (12) comprises four rows of heat pipes.

5. The mine return air heat extraction and intake air heating system according to claim 1, characterized in that, The density of the longitudinal flow equalization grid (11) and the transverse flow equalization grid (13) of the heat pipe is adjustable.

6. The mine return air heat extraction and intake air heating system according to claim 1, characterized in that, The return air inlet device (2) includes a return air fan (21), a conversion structure (22), and a return air inlet duct (23); The conversion structure (22) connects the return air fan (21) and the return air inlet duct (23); The end of the return air inlet duct (23) away from the conversion structure (22) is connected to the return air section (16).

7. The mine return air heat extraction and intake air heating system according to claim 6, characterized in that, The conversion structure (22) includes a transversely arranged conversion channel (221), a damper (222), and a transmission component (223); The conversion channel (221) has a rectangular cross-section, and one end of the conversion channel (221) is connected to the return air fan (21), while the other end is connected to the outside through the diffuser (225). An opening (224) for connecting the return air inlet duct (23) is provided at the top of the conversion channel (221); The opening (224) is rectangular along the length of the conversion channel (221), and the side length of the opening (224) parallel to the length of the conversion channel (221) is greater than the longitudinal side length of the cross-section of the conversion channel (221). The side length of the opening (224) perpendicular to the length of the conversion channel (221) is equal to the transverse side length of the cross-section of the conversion channel (221). The damper (222) is disposed on the opening (224) and is adapted to the shape of the opening (224); The end of the damper (222) away from the return air fan (21) is rotatably connected to the corresponding side of the opening (224), and the end closer to the return air fan (21) is connected to the transmission component (223).

8. The mine return air heat extraction and intake air heating system according to claim 6, characterized in that, There are two return air fans (21) and two conversion structures (22), and the two return air fans (21) are connected to the two conversion structures (22) in a one-to-one correspondence.

9. The mine return air heat extraction and intake air heating system according to claim 1, characterized in that, The fresh air outlet device (3) includes a fresh air fan (31) and a fresh air outlet duct (32); The inlet end of the fresh air fan (31) is connected to the fresh air section (15), and the outlet end is connected to the wellhead room (4) through the fresh air outlet duct (32).

10. The mine return air heat extraction and intake air heating system according to claim 9, characterized in that, There are two fresh air fans (31) and two fresh air outlet ducts (32), and the two fresh air fans (31) are connected to the two fresh air outlet ducts (32) in a one-to-one correspondence.

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