Large-air-volume low-temperature heat pipe mine ventilation air methane heat energy recycling device

Abstract

The utility model relates to a large-air-volume low-temperature heat pipe mine ventilation air methane heat energy recycling device which comprises an air inlet channel and an air return channel of a mine, and the air inlet channel and the air return channel are provided with a combination section where the side walls of the two channels are tightly combined and isolated from each other. The combination section is provided with a plurality of low-temperature heat pipes penetrating through the close combination portion of the two channels, and a partition plate is arranged at the close combination portion of the two channels. The mine air return pipeline and the air inlet pipeline are arranged side by side, the low-temperature heat pipe is adopted as a heat exchange device, heat energy contained in ventilation air exhausted by the mine is directly conducted to fresh air entering the mine through the low-temperature heat pipe, and the whole device is simple in structure, few in moving parts, easy to install and maintain and low in cost. Compared with an existing mine heat pump heat exchange system, the mine heat pump heat exchange system is higher in heat conversion efficiency, lower in investment cost, less in operation cost, more in heat energy recovery and higher in reliability, and therefore the freezing problem of a wellhead heater is solved.

Description

Technical Field

[0001] The utility model relates to a large-volume low-temperature heat pipe mine exhaust air heat energy recovery and utilization device, which is an environmental protection device and a device for recycling the heat energy contained in the mine exhaust air. Background Art

[0002] Mine return air runs continuously all year round, and contains a huge amount of low-temperature heat energy. In recent years, the return air source heat pump system that recovers the low-temperature heat energy in the mine exhaust air to solve the anti-freezing of the wellhead has been widely used. Compared with traditional coal-fired boilers, this system has shown good results in saving raw coal consumption, reducing operating costs, and reducing greenhouse gas emissions, and has achieved significant economic and environmental benefits. However, the return air source heat pump technology also has its shortcomings:

[0003] 1. The heat pump system uses the principle of direct air-water heat exchange to recover low-temperature heat energy in the mine return air. The recovered heat energy is limited by the circulating water temperature, and the heat recovery efficiency is low. The exhaust air temperature after heat exchange is still high, and the recovery temperature difference is small, so the recovery rate of low-temperature heat energy in the mine return air is limited;

[0004] 2. The heat pump system uses three circulation processes: air-water heat exchange, heat pump system working fluid circulation temperature increase, and water-air heat exchange to complete the heating of the fresh air in the air well. There are many circulation loops, large installed power, large power consumption, and low system efficiency. Since the heat pump system is relatively complex, the operating and management costs are relatively high;

[0005] 3. The heat pump system uses low-temperature hot water as the heat source for wellhead antifreeze, and traditional copper finned tubes as the heat exchange elements of the wellhead heater. Freezing accidents of the heat exchange elements occur from time to time, especially in low temperature and high-cold areas, which seriously affects the safe operation of wellhead antifreeze.

[0006] How to improve heat exchange efficiency, simplify the system, reduce costs, and prevent freezing accidents of heat exchange components is a problem that needs to be solved. Summary of the invention

[0007] In order to overcome the problems of the prior art, the utility model proposes a large air volume low temperature heat pipe mine exhaust air heat energy recovery and utilization device. The device uses a low temperature heat pipe to heat the fresh air of the air inlet shaft in an air-to-air direct heat exchange method to meet the antifreeze heat energy demand of the wellhead.

[0008] The purpose of the utility model is achieved as follows: a large air volume low-temperature heat pipe mine exhaust air heat energy recovery and utilization device, comprising: an air inlet channel and a return air channel of the mine, the air inlet channel and the return air channel are provided with a section of the side walls of the two channels that are closely combined with each other and isolated from each other, the combination section is provided with a plurality of low-temperature heat pipes passing through the closely combined part of the two channels, and the closely combined part of the two channels is provided with a partition.

[0009] Furthermore, the air inlet passage is provided with a fan.

[0010] Furthermore, the return air duct is provided with a fan.

[0011] Furthermore, the return air duct is provided with a drain outlet.

[0012] Furthermore, the low-temperature heat pipes are aligned vertically and horizontally.

[0013] Furthermore, the low-temperature heat pipes are arranged in a crisscross pattern.

[0014] Furthermore, the air inlet channel and the air return channel are arranged vertically.

[0015] Furthermore, the air inlet channel and the air return channel are arranged horizontally.

[0016] The advantages and beneficial effects of the utility model are as follows: the utility model arranges the mine return air duct and the air inlet duct side by side, and adopts a low-temperature heat pipe as a heat exchange device, so that the heat energy contained in the exhausted air discharged from the mine is directly transmitted to the fresh air entering the mine through the low-temperature heat pipe. The whole device has a simple structure and few moving parts, so it is easy to install and maintain, and the construction cost and the use cost are relatively low. Compared with the existing mine heat pump heat exchange system, the heat conversion efficiency is higher, the investment cost is lower, the operating cost is less, the heat energy recovery is more, and the reliability is higher, thereby solving the freezing problem of the wellhead heater. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0018] Figure 1 It is a structural schematic diagram of the device described in Embodiment 1 of the present utility model;

[0019] Figure 2 It is a cross-sectional view of the upper and lower combined sections described in Embodiments 1 and 7 of the present utility model. Figure 1 Cross-section of the middle AA;

[0020] Figure 3 It is a cross-sectional view of the left and right combined sections described in Embodiments 1 and 8 of the present utility model;

[0021] Figure 4 This is a schematic diagram of the vertical and horizontal alignment of the low-temperature heat pipes in the combined section of the fifth embodiment of the present utility model. Figure 1 Cross-section of the middle CC;

[0022] Figure 5 This is a schematic diagram of the crisscross arrangement of the low-temperature heat pipes in the combined sections according to the sixth embodiment of the present utility model. Figure 1 Cross-section of CC. DETAILED DESCRIPTION

[0023] Embodiment 1:

[0024] This embodiment is a large air volume low temperature heat pipe mine exhaust air heat energy recovery and utilization device, such as Figure 1 This embodiment includes: an air inlet channel 1 and an air return channel 2 of a mine, wherein the air inlet channel and the air return channel are provided with a section 3 ( Figure 1 The part framed by the double-dotted line in the middle), the joint section is provided with a plurality of low-temperature heat pipes 4 passing through the tightly joined part of the two channels, and the tightly joined part of the two channels is provided with a partition 5.

[0025] The large air volume mentioned in this embodiment refers to the hot air volume generated per minute of tens of thousands of cubic meters, and the cold air (outdoor cold air) of more than ten degrees below zero is heated to the mine pit entrance temperature of several degrees above zero by using the hot air of only a dozen degrees (exhaust air discharged from the mine tunnel) through the low-temperature heat pipe conduction conversion. If a conventional heat sink-shaped heat exchanger is used, since the temperatures at both ends of the heat exchange are very low, such heat conversion is unimaginable, and only low-temperature heat pipes can achieve such an effect.

[0026] The "low temperature heat pipe" is a very special heat exchange pipe, sometimes called a "heat pipe" or a "superconducting heat pipe". Since the term "heat pipe" is easily confused with the heat pipe in the heat exchanger, and the "superconducting heat pipe" is easily confused with the superconducting material, this embodiment adopts the name "low temperature heat pipe" according to the characteristics of this heat pipe. This name is only applicable to the utility model, because this heat pipe specially used for heat conduction can also be used in a temperature range of more than 100 degrees, but it is beyond the application scope of the utility model and will not be discussed.

[0027] The low-temperature heat pipe described in this embodiment is a device specially used for heat conduction, usually a tube with a relatively large length-diameter ratio. Its typical structure includes: an outer tube shell with or without fins at both ends, a central liquid suction tube and an end cap. The two ends of the outer tube shell are closed with end cap tubes, and the inner negative pressure is evacuated to 1.3×(10-1~10-4)Pa and then filled with an appropriate amount of working liquid, so that the capillary porous material of the liquid suction core close to the inner wall of the outer tube shell is filled with liquid and then sealed. One end of the heat pipe is an evaporation section (heating section), and the other end is a condensation section (cooling section). An insulation section can be arranged between the two sections according to application needs. When one end of the heat pipe is heated, the liquid in the capillary core evaporates and vaporizes. The steam flows to the other end under a small pressure difference to release heat and condense into a low-temperature liquid. The liquid then flows back to the evaporation section along the porous material by the action of capillary force. This cycle continues endlessly, and heat is transferred from one end of the heat pipe to the other end of the heat pipe, and the heat transfer efficiency is extremely high.

[0028] As a high-quality low-temperature waste heat resource in the coal mine system, the return air temperature and humidity of mine exhaust air are basically constant all year round. At present, most mines are generally at 10-20℃, with a relative humidity of ≥90%, and the return air volume is generally large. As an important secondary thermal energy resource in mines, most of the exhaust air in coal mines is currently discharged directly into the atmosphere, and the low-temperature waste heat is not effectively utilized. Due to the use of low-temperature heat pipe waste heat recovery devices, the waste heat contained in the mine exhaust air is recovered and used to heat the mine fresh air. Its direct heat exchange method not only has extremely high conversion efficiency, but also greatly simplifies the equipment and process flow.

[0029] In order to use low-temperature heat pipes for heat conduction, the present embodiment designs the mine air inlet channel and the return air channel as parallel pipes in a certain section, and the outer contour side surfaces of the pipes in this section of parallel pipes are designed as planes, and the outer contour side surfaces of the two pipes (upper and lower sides, such as Figure 2 As shown, or the left and right sides, such as Figure 3 The planes of the two pipes (as shown in the figure) are combined together, which is called a combined section. In the combined section, although the sides of the pipes are combined together, the pipes are not connected, but only the sides are combined. In the combined section, since the side of the pipe is a plane, a low-temperature heat pipe can be inserted so that the cold end of the low-temperature heat pipe is in the return air channel and the hot end is in the air inlet channel. When the combined section is combined up and down, the plane of the combined section is horizontal, and the low-temperature heat pipe is in a vertical state. When the combined section is combined left and right, the plane of the combined section is vertical, and the low-temperature heat pipe is in a horizontal state. The low-temperature heat pipe can be perpendicular to the plane of the combined section, or it can be slightly inclined, but it cannot be too inclined, which will cause a decrease in heat exchange efficiency. Partitions are set in the combined section to fix the low-temperature heat pipe. According to the requirements of the surrounding equipment and environment, the internal air flow direction of the two pipes can be designed to be the same, or it can be designed to be opposite, such as Figure 1 The cross-sectional shapes of the two pipes can be as follows: Figure 1 The shape can be rectangular, semicircular or other shapes, and its shape mainly depends on the site environment and ventilation needs. The arrangement of the low-temperature heat pipe on the plane of the combined section is designed according to the site needs, and can be arranged in a vertical and horizontal alignment or a crisscross arrangement.

[0030] Depending on the on-site conditions of the joint surface, it can be designed as a combination of upper and lower parts, that is, the air inlet duct is on the top and the return air duct is on the bottom; it can also be designed as a combination of left and right parts, that is, the air inlet duct is on the left and the return air duct is on the right, or vice versa.

[0031] In order to increase air flow and improve heat conduction efficiency, fans can be installed in the air inlet duct or the air return duct, and fans are designed in both.

[0032] In the combined section return air channel, since the mine exhaust air contains a lot of water vapor, condensation will occur when it encounters the low-temperature heat pipe, producing liquid water. If the combined section pipe of the return air channel is horizontal, the liquid water may gather at the bottom of the pipe, so a drain port can be set at the bottom of the combined section pipe of the return air channel to discharge the liquid water.

[0033] Embodiment 2:

[0034] This embodiment is an improvement of the first embodiment and is a refinement of the first embodiment regarding the air inlet channel. The air inlet channel described in this embodiment is provided with a fan 101, such as Figure 1 shown.

[0035] The fan can be installed in front of the combined section (the side where the airflow enters the combined section is the front), such as Figure 1 As shown, it can also be installed behind the joining section.

[0036] The fan can be axial flow or centrifugal (such as Figure 1 indicated by dotted lines).

[0037] Embodiment three:

[0038] This embodiment is an improvement of the above embodiment and a refinement of the above embodiment regarding the return air duct. The return air duct described in this embodiment is provided with a fan 201, such as Figure 1 shown.

[0039] The fan can be installed in front of the combined section (the side where the airflow enters the combined section is the front), such as Figure 1 As shown, it can also be installed behind the joining section.

[0040] The fan can be axial flow or centrifugal (such as Figure 1 indicated by dotted lines).

[0041] Embodiment 4:

[0042] This embodiment is an improvement of the above embodiment and a refinement of the above embodiment regarding the return air duct. The return air duct described in this embodiment is provided with a drain port 202, such as Figure 1 shown.

[0043] One or more drain outlets may be provided according to site needs, or a water flow trough or funnel-shaped depression may be provided at the bottom of the return air duct junction section to discharge liquid water in a centralized manner.

[0044] Embodiment five:

[0045] This embodiment is an improvement of the above embodiment and a refinement of the arrangement of low-temperature heat pipes in the above embodiment. The low-temperature heat pipes described in this embodiment are arranged in a vertical and horizontal manner. Figure 4 shown.

[0046] The arrangement of this low-temperature heat pipe is relatively simple, and the air flow ( Figure 4 The passage in the direction of arrow B is relatively smooth and is more suitable for situations where the air flow rate is higher.

[0047] Embodiment six:

[0048] This embodiment is an improvement of the above embodiment and a refinement of the arrangement of low-temperature heat pipes in the above embodiment. The low-temperature heat pipes described in this embodiment are arranged in a crisscross pattern, such as Figure 5 shown.

[0049] The arrangement of this low-temperature heat pipe is slightly complicated, and the air flow ( Figure 5 The channel (in the direction of arrow B) is relatively tortuous, which is more suitable for situations where the air flow rate is relatively low and can provide better heat exchange effects.

[0050] Embodiment seven:

[0051] This embodiment is an improvement of the above embodiment, and is a refinement of the above embodiment regarding the air inlet channel and the air return channel. The air inlet channel and the air return channel described in this embodiment are arranged up and down, such as Figure 2 shown.

[0052] Under the action of gravity, the gas-liquid conversion in the heat pipe can be achieved even without capillary action. Therefore, the arrangement of the air inlet channel on the top (the heat release end of the low-temperature heat pipe on the top) and the return air channel on the bottom (the heat absorption end of the low-temperature heat pipe on the bottom) is relatively reasonable and is a better choice.

[0053] Embodiment eight:

[0054] This embodiment is an improvement of the above embodiment, and is a refinement of the above embodiment regarding the air inlet channel and the air return channel. The air inlet channel and the air return channel described in this embodiment are arranged horizontally, such as Figure 3 shown.

[0055] Due to the capillary effect inside the low-temperature heat pipe, even if the low-temperature heat pipe is placed horizontally (even the heat release end of the low-temperature heat pipe is lower than the heat absorption end), the heat can be conducted very smoothly. Therefore, it is reasonable to arrange the air inlet and return air channels horizontally.

[0056] Finally, it should be noted that the above is only used to illustrate the technical solution of the utility model and is not a limitation. Although the utility model has been described in detail with reference to the preferred arrangement scheme, ordinary technicians in the field should understand that the technical solution of the utility model (such as the form of the air inlet channel and the return air channel, the size of the air inlet and exhaust air speeds or changes in the flow rate, the form of the mine's air intake and exhaust system and the low-temperature heat pipe, etc.) can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model.

Claims

1. A large air volume low temperature heat pipe mine exhaust air heat energy recovery and utilization device, comprising: The air inlet channel and the air return channel of the mine are characterized in that the air inlet channel and the air return channel are provided with a section in which the side walls of the two channels are tightly combined with each other and isolated from each other, the combination section is provided with a plurality of low-temperature heat pipes passing through the tightly combined part of the two channels, and the tightly combined part of the two channels is provided with a partition.

2. The device according to claim 1, characterized in that The air inlet channel is provided with a fan.

3. The device according to claim 2, characterized in that The return air channel is provided with a fan.

4. The device according to claim 3, characterized in that The return air duct is provided with a drain outlet.

5. The device according to claim 4, characterized in that The low-temperature heat pipes are aligned vertically and horizontally.

6. The device according to claim 4, characterized in that The low-temperature heat pipes are arranged in a crisscross pattern.

7. The device according to claim 5 or 6, characterized in that The air inlet channel and the air return channel are arranged up and down.

8. The device according to claim 5 or 6, characterized in that The air inlet channel and the air return channel are arranged horizontally.

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