Photovoltaic-energy storage-oxidation ventilation air methane destruction and utilization device and method

Abstract

The invention relates to a photovoltaic-energy storage-oxidation ventilation air methane destruction and utilization device and a photovoltaic-energy storage-oxidation ventilation air methane destruction and utilization method. According to the technical scheme, an air taking linkage mechanism, a dehydration filter, a fan and an oxidation device are sequentially connected through a ventilation air methane pipeline, and ventilation air methane is connected with a mine air inlet pipeline, an exhaust pipeline, a waste heat boiler and a high-temperature air pipeline through the oxidation device. The photovoltaic power station is connected with the fan through a fan photovoltaic cable, connected with the oxidation device through a photovoltaic heat storage cable and connected with the mine transformer substation through a network cable, the fan is connected with the mine transformer substation through a fan network cable, and the waste heat boiler is connected with the heat exchange station through a hot water pipeline. The device has the advantages that ventilation air methane in all concentration ranges can be destroyed, purification and emission are achieved, and haze weather in a mining area is reduced; energy needed by methane oxidation of the ventilation air methane is supplied through photovoltaic power generation, and the problem that oxidation cannot be maintained when the concentration of the ventilation air methane is too low is solved; and thirdly, the project operation power consumption cost is reduced.

Description

Technical Field

[0001] The present invention relates to processes and equipment for ecological environment protection and clean energy utilization, and in particular to a photovoltaic-energy storage-oxidation device and method for destroying and utilizing methane from ventilation gas. Background Art

[0002] Ventilation gas refers to the airflow discharged from the main fans on the ground of coal mines, with a methane concentration of no more than 0.75%, and containing a certain amount of fine particulate matter and other trace harmful gases. To ensure safe production in coal mines, the maximum methane concentration of ventilation gas in my country does not exceed 0.4%, and most of it is around 0.2%. In low-gas mining areas, such as Shandong, the methane concentration is below 0.1%. Although the methane content is very low, the air volume is large. The air volume discharged from each coal mine ventilation shaft is generally 600,000 m3. 3 / h. The destruction and utilization of ventilation gas alone is a global technical challenge. Only the ventilation gas is mixed with extraction gas for oxidation or burned as other fuels, but the application amount is almost zero compared to the huge amount of ventilation gas emitted. In the process of coal mining, my country emits about 20 billion cubic meters of methane in the form of ventilation gas every year. 3 Its greenhouse effect on the atmosphere is equivalent to 400 million tons of carbon dioxide. As early as 2006, Shengli Power Machinery Group Co., Ltd. of Shengli Oilfield and Shandong University of Technology began research on thermal regenerative countercurrent oxidation technology for ventilation air methane (VAM) through a collaborative industry-university-research partnership. The implementation of the CDM mechanism during the first commitment period of the Kyoto Protocol in 2008 sparked a nationwide surge in research on VFM oxidation technology and the development of oxidation devices. In 2009, the Ministry of Science and Technology designated the development of key technologies and equipment for VFM oxidation utilization as a National 863 Key Project. All research and application approaches essentially involve oxidation of extracted gas mixed with air; there are no cases solely focused on the oxidation and destruction of VFM methane. The above research and application of oxidation devices all operate with methane concentrations greater than 0.4%. Below this concentration, the oxidation device cannot maintain operation, and economic benefits primarily come from carbon trading under the CDM mechanism. After 2012, due to the failure to reach a conclusion on the second commitment period of the Kyoto Protocol, carbon trading under the CDM mechanism was stopped and gas oxidation entered a low period. Only about 20 coal mines used low-concentration extracted gas mixed with air for oxidation heating instead of coal-fired boilers for heating.

[0003] In recent years, under the backdrop of the "dual carbon" initiative, the wind power and photovoltaic industries have experienced rapid growth. By 2024, installed capacity of renewable energy generation will surpass that of thermal power plants, making it difficult for the power grid to absorb this renewable energy. At the same time, coal companies have completely eliminated coal-fired boilers for heating, necessitating the urgent need for clean energy alternatives for coal mine production and daily life. Since the Ministry of Ecology and Environment released the "Action Plan for Methane Emission Control" in 2023, exhaust gas (FAM) control has become a key emission control target. In May 2025, the state included the development and demonstration of FAM treatment technologies and equipment as a major scientific and technological research project. Traditional countercurrent thermal oxidation systems cannot oxidize and utilize FAM. If they are blended with drained gas, the amount of FAM destroyed and utilized is too small for resource adequacy and economic efficiency. Furthermore, there are more convenient, efficient, and economical ways to utilize drained gas. Blending with other auxiliary fuels is also unfeasible due to resource adequacy and economic efficiency, and the greenhouse gas emissions reductions are not offset by the additional greenhouse gas emissions from project operation. To sum up, relying on my country's new energy technology system, inventing a technology and equipment for the destruction and utilization of ventilation gas that does not require auxiliary carbon-based fuels, is economically feasible or economically affordable, and is truly applicable to the entire coal mining area, is of great practical significance for achieving the "dual carbon" goal. Summary of the Invention

[0004] The purpose of the present invention is to address the above-mentioned shortcomings of the existing technology and provide a photovoltaic-energy storage-oxidation device and method for the destruction and utilization of methane from exhaust gas. Photovoltaic electricity is stored in a honeycomb ceramic within the oxidation device, providing auxiliary energy for exhaust gas oxidation to maintain its operation. Excess heat is extracted to provide heating for the coal mine area. Lower exhaust gas concentrations require more photovoltaic electricity, and vice versa. When the exhaust gas concentration is not less than 0.15%, the heat released by exhaust gas oxidation can be self-sustaining. Photovoltaic power generation can be stored in the honeycomb ceramic as thermal energy and extracted for utilization, or it can be used as electrical energy for the coal mine's own use. During photovoltaic power generation, power consumption equipment such as the exhaust gas oxidation fan can be directly supplied with electricity.

[0005] The photovoltaic-energy storage-oxidation exhaust gas methane destruction and utilization device mentioned in the present invention has a technical solution of comprising: an air intake linkage mechanism (1), an air intake linkage mechanism (2), a dehydration filter (3), an exhaust gas pipeline (4), a fan (5), an oxidation device (6), a mine air inlet pipeline (7), a low-temperature exhaust pipeline (8), a hot water pipeline (9), a waste heat boiler (10), a high-temperature air pipeline (11), a fan photovoltaic cable (12), a photovoltaic heat storage cable (13), a grid power heating cable (14), an internet cable (15), a fan grid power cable (16), and a photovoltaic power station (17), wherein the exhaust gas is sequentially taken out through the exhaust gas pipeline (4). The wind linkage mechanism (1) or the wind extraction linkage mechanism (2), the dehydration filter (3), the fan (5), and the oxidation device (6) are connected. The exhaust gas is connected to the mine air inlet duct (7), the low-temperature exhaust duct (8), the waste heat boiler (10), and the high-temperature air duct (11) respectively through the oxidation device (6). The photovoltaic power station (17) is connected to the fan (5) through the fan photovoltaic cable (12), the photovoltaic heat storage cable (13) and the oxidation device (6), and the network cable (16) and the mine substation respectively. The fan (5) is connected to the mine substation through the fan network cable (16). The waste heat boiler (12) is connected to the heat exchange station through the hot water pipe (9).

[0006] Preferably, the dehydration filter (3) comprises a self-overflowing drain valve (3-1), a shell (3-2), a water collecting tank (3-3), a dehydration filter core (3-4), and a winding column (3-5); an air inlet pipe (3-6) is provided on one side of the shell (3-2), and an air outlet pipe (3-7) is provided on the other side; a water collecting tank (3-3) is provided at the lower part of the shell (3-2); and dehydration filter cores (3-4) of one level or more are provided in the inner cavity of the shell (3-2); the dehydration filter cores (3-4) are installed on a plurality of columns (3-5); and a self-overflowing drain valve (3-1) is provided on the upper side of the water collecting tank (3-3).

[0007] Preferably, the oxidation device (6) comprises an electric heating rod (6-1), a high-temperature flue gas intake cover (6-2), a manhole (6-3), a honeycomb ceramic (6-4), a ceramic partition (6-5), a heat preservation module (6-6), a shell (6-7), a flow guide cover (6-8), a reversing mechanism (6-9), and a diesel burner (6-10). The shell (6-7) has an inner cavity provided with a honeycomb ceramic (6-4), and the ceramic partition (6-5) divides the honeycomb ceramic (6-4) horizontally at equal intervals. A plurality of electric heating rods (6-1) are arranged in the shell (6-7). The top is evenly distributed and inserted for installation; a guide cover (6-8) is provided below the honeycomb ceramic (6-4); a reversing mechanism (6-9) is provided at the lower part of the guide cover (6-8); at least two reversing mechanisms (6-9) are provided and are placed at the lowest part of the shell (6-7); a heat preservation module (6-6) is provided on the inner wall of the shell (6-7); a high-temperature flue gas intake cover (6-2) is provided in the middle of the top of the shell (6-7); a manhole (6-3) is provided on the side of the shell (6-7); and a diesel burner (6-10) is installed on the shell (6-7).

[0008] Preferably, the reversing mechanism (6-9) comprises a valve box (6-9-1), a power cylinder (6-9-2), a guide shaft sleeve (6-9-3), a grease nipple (6-9-4), a guide bracket sleeve (6-9-5), a valve shaft (6-9-6), a valve body (6-9-7), a sealing ring (6-9-8), a buffer spring (6-9-9), a valve plate (6-9-10), and a universal joint (6-9-11). The valve body (6-9-7) is a herringbone structure, with a group of valve boxes (6-9-1) connected to both sides thereof. The power cylinder (6-9-2) is installed in the valve box ( In the middle of one side of the valve body (6-9-1), the telescopic rod of the power cylinder (6-9-2) passes through the guide shaft sleeve (6-9-3) and the guide bracket sleeve (6-9-5) to be connected to the valve shaft (6-9-6). The valve shaft (6-9-6) is connected to the valve plate (6-9-10) through a universal joint (6-9-11). Two buffer springs (6-9-9) are sleeved on the valve shaft (6-9-6) and are located on both sides of the valve plate (6-9-10). The guide bracket sleeve (6-9-5) is centrally connected to the valve box (6-9-1). The sealing ring (6-9-8) is installed on the outer end of the valve body (6-9-7).

[0009] Preferably, the above-mentioned honeycomb ceramic (6-4) is a rectangular parallelepiped with a mounting boss (6-4-1) at the lower end, and its cross section is square (6-4-2). The honeycomb openings are square or hexagonal. The honeycomb openings stacked at the upper part in the oxidation device (6) are small in size and thin in wall thickness, and the material contains a metal oxide component with catalytic function; the honeycomb openings in the middle part are large in size and thick in wall thickness; and the honeycomb openings in the lower part are medium in size.

[0010] Preferably, the above-mentioned electric heating rod (6-1) includes a power terminal (6-1-1), a mounting flange (6-1-2), and a heating resistance wire (6-1-3). The power terminal (6-1-1) is installed on the upper side of the mounting flange (6-1-2), and the heating resistance wire (6-1-3) is installed on the lower side of the mounting flange (6-1-2). The material of the heating resistance wire (6-1-3) is 0Cr27Al7Mo2, and its appearance after folding is cylindrical, and its maximum temperature resistance is 1400°C.

[0011] Preferably, explosion relief plates are installed on the sides of the above-mentioned deflector covers (6-8).

[0012] Preferably, the air intake linkage mechanism (1) is connected to the main fan of the air shaft 1#, and the air intake linkage mechanism (2) is connected to the main fan of the air shaft 2#, and is switched for use during the maintenance and overhaul of the main fan of the air shaft. When the oxidation device (1) is not operating normally, the linkage mechanism is switched to the state of exhaust gas discharge to the air.

[0013] Preferably, the above-mentioned reversing mechanism (6-9) further includes a purge valve (6-9-12), the purge valve (6-9-12) is connected to the upper side of the valve body (6-9-7), and the purge valve (6-9-12) is provided with a power cylinder (6-9-2), a guide shaft sleeve (6-9-3), a grease nipple (6-9-4), a guide bracket sleeve (6-9-5), a valve shaft (6-9-6), a buffer spring (6-9-9), a valve plate (6-9-10) and a universal joint (6-9-11).

[0014] The method for using the photovoltaic-energy storage-oxidation ventilation gas methane destruction and utilization device mentioned in the present invention includes the following steps: 1. Photovoltaic power generation and energy storage process According to the use of available land, photovoltaic power stations (17) can be centrally or dispersedly set up near the main fan of the wind shaft. Photovoltaic electricity is converted into heat energy through the electric heating rod (6-1) built into the oxidation device (6) and stored in the honeycomb ceramic (6-4) with strong heat storage capacity; the exhaust gas is sent into the oxidation device (6) through the fan (5), and the flow direction of the exhaust gas in the oxidation device (6) is periodically changed through the reversing mechanism (6-9), so that the heat in the honeycomb ceramic (6-4) is pushed to the honeycomb ceramic (6-4) in the oxidation device (6). The honeycomb ceramic (6-4) presents a shape with a gradually lower temperature from top to bottom, and the highest temperature does not exceed 1200°C. The temperature of the clean low-temperature flue gas discharged is not higher than the original temperature of the exhaust gas entering the oxidation device (6) by an average of 10°C throughout the day; During the period when photovoltaic power generation is not in progress, the heat stored in the honeycomb ceramic (6-4) continues to maintain the continuous oxidation and destruction of the ventilation gas; the surplus electricity during photovoltaic power generation can be fed back to the project power supply; the capacity of the photovoltaic power station (17) is configured according to the overall balance of ventilation gas concentration and mine electricity and heat load; 2. Ventilation gas dehydration, filtration and countercurrent oxidation process The exhaust gas from the main fan of the wind shaft passes through the dehydration filter (3) to remove the free water and most of the fine particles therein. The fan sends the purified exhaust gas to the oxidation device (6) through the reversing mechanism (6-9). After passing through the honeycomb ceramic (6-4), it is gradually preheated to a temperature above 950°C. The methane in the exhaust gas is quickly adsorbed in the upper honeycomb ceramic (6-4). Under the catalysis of the metal oxide in the honeycomb ceramic (6-4) and the high temperature, the methane is quickly oxidized and decomposed on the surface of the honeycomb ceramic (6-4), releasing heat and storing it in the honeycomb ceramic (6-4) on the downwind side. In this process, the residual coal dust and other harmful gases in the exhaust gas are also destroyed and processed. After 60 to 100 seconds, the reversing mechanism (6-9) sequentially changes the flow direction of the exhaust gas in each honeycomb ceramic (6-4) for heat storage oxidation, and enters the next oxidation heat release and heat storage process. This cycle is repeated, and the methane in the exhaust gas is continuously oxidized and destroyed. 3. Heat extraction and utilization process The heat stored in the honeycomb ceramic (6-4) of the oxidation device (6) is taken out from the high-temperature flue gas cover (6-2) on the top of the oxidation device (6) during the process of the fan (5) sending the exhaust gas into the oxidation device (6) and the reversing mechanism (6-9) changing the flow direction of the exhaust gas in the honeycomb ceramic (6-4). The high-temperature flue gas of about 950°C is produced through the waste heat boiler to produce steam or hot water, which is sent to the mine heat exchange station to provide heat source for coal mine production and life; in addition, when the temperature is below 0 degrees in winter, the clean low-temperature flue gas after oxidation is directly sent to the mine air inlet to preheat the mine air intake to prevent the wellhead from freezing.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The present invention uses the reversing mechanism of the oxidation device to adjust the opening and closing sequence, opening and closing timing, and time of each inlet and exhaust valve to control the flow state of the high-temperature airflow within the oxidation device, ensuring uniform airflow and temperature fields within the thermal storage chamber. Methane in the exhaust gas is adsorbed on the surface of the honeycomb ceramic and catalytically oxidized at high temperatures, completely destroying the ultra-low concentration of exhaust gas methane. The invention also avoids significant impacts on the exhaust gas flow caused by airflow reversal. Compared to a rotary valve, the reversing mechanism has a simple structure, quick operation, reliable sealing, and easy maintenance. 2. Without relying on carbon-based auxiliary fuels, it can destroy methane in ventilation gas of all concentration ranges, solving the problem of being unable to maintain oxidation when the ventilation gas concentration is too low. It can purify ventilation gas emissions, reduce haze in mining areas, and achieve "carbon reduction and pollution reduction"; 3. Photovoltaic power generation provides activation energy for the oxidation of ultra-low concentration exhaust gas and electricity for the operation of project equipment. The project's surplus electricity is incorporated into the mine substation, and heat is incorporated into the coal mine heat exchange station, replacing coal, gas or electric boilers, increasing external power supply, heat and environmental benefits, reducing project investment risks, and avoiding additional greenhouse gas emissions from project operation. 4. The reversing mechanism with a multi-valve structure can be manufactured in a modular manner. It can be freely combined with the honeycomb ceramic chamber to form oxidation devices with different air processing volumes according to the needs of the coal mine site. Its structure ensures smooth airflow in and out, reduces the power consumption of the fan, which has the highest operating cost in the project, reduces equipment manufacturing costs and project operating costs, and shortens the project construction period. 5. This invention breaks through the technical and economic bottlenecks that restrict the destruction and utilization of wind-loss gas. Against the backdrop of widespread sunshine and mature and cheap photovoltaics, the project is easy to replicate and promote, especially in mining areas in Northwest and North my country where coal mines are densely distributed. It will make a significant contribution to achieving the "dual carbon" goals. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the process and equipment flow of an embodiment of the present invention; Figure 2 It is a schematic structural diagram of the dehydration filter of the present invention; Figure 3 This is a schematic diagram of the structure of the dehydration filter of the present invention when viewed from above; Figure 4 It is a schematic structural diagram of the oxidation device of the present invention; Figure 5 It is a schematic diagram of the side structure of the oxidation device of the present invention; Figure 6 This is a schematic structural diagram of a reversing mechanism of the present invention suitable for destroying methane by oxidation at a rate of not less than 95%; Figure 7 It is a schematic diagram of the honeycomb ceramic structure of the present invention; Figure 8 is a schematic cross-sectional view of the honeycomb ceramic of the present invention; Figure 9 It is a schematic structural diagram of the electric heating rod of the present invention; Figure 10 This is a schematic diagram of the structure of the reversing mechanism of the present invention suitable for nearly 100% destruction of methane by oxidation; Figure 11 It is a schematic diagram of the enlarged structure of the interior of the valve box of the present invention; In the figure above: air intake linkage mechanism 1, air intake linkage mechanism 2, dehydration filter 3, exhaust gas pipe 4, fan 5, oxidation device 6, mine air inlet pipe 7, low-temperature exhaust pipe 8, hot water pipe 9, waste heat boiler 10, high-temperature air pipe 11, fan photovoltaic cable 12, photovoltaic thermal storage cable 13, grid power heating cable 14, grid cable 15, fan grid power cable 16, photovoltaic power station 17; self-overflow drain valve 3-1, shell 3-2, water collection tank 3-3, dehydration filter element 3-4, winding column 3-5, electric heating rod 6-1, high-temperature flue gas intake cover 6-2, manhole 6-3, honeycomb ceramic 6-4, ceramic Partition 6-5, insulation module 6-6, shell 6-7, deflector 6-8, reversing mechanism 6-9, diesel burner 6-10, valve box 6-9-1, power cylinder 6-9-2, guide shaft sleeve 6-9-3, grease nipple 6-9-4, guide bracket sleeve 6-9-5, valve shaft 6-9-6, valve body 6-9-7, sealing ring 6-9-8, buffer spring 6-9-9, valve plate 6-9-10, universal joint 6-9-11, purge valve 6-9-12, mounting boss 6-4-1, square 6-4-2, power terminal 6-1-1, mounting flange 6-1-2, heating resistor 6-1-3. DETAILED DESCRIPTION

[0017] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0018] Example 1, with reference to Figure 1 The photovoltaic-energy storage-oxidation ventilation gas methane destruction and utilization device mentioned in the present invention has a processing capacity of 100,000 m 3 / h ventilation gas oxidation device is equipped with a "photovoltaic-energy storage-oxidation" three-in-one system with a photovoltaic power generation capacity of 6MW. Its heat storage capacity is 40GJ (equivalent to more than 10,000 kWh of electricity), which can be applied to the destruction and utilization of ventilation gas in the main fan of the coal mine ventilation shaft with a concentration fluctuating between 0% and 0.75%; its technical solution is: including an air intake linkage mechanism 1, an air intake linkage mechanism 2, a dehydration filter 3, a ventilation gas pipeline 4, a fan 5, an oxidation device 6, a mine air inlet pipeline 7, a low-temperature exhaust pipeline 8, a hot water pipeline 9, a waste heat boiler 10, a high-temperature air pipeline 11, a fan photovoltaic cable 12, a photovoltaic heat storage cable 13, a grid power heating cable 14, and a grid power supply cable. Cable 15, fan grid power cable 16, photovoltaic power station 17, through the exhaust gas pipeline 4, the air intake linkage mechanism 1 or the air intake linkage mechanism 2, the dehydration filter 3, the fan 5, the oxidation device 6 are connected in sequence, the exhaust gas is connected to the mine air inlet pipeline 7, the low-temperature exhaust pipeline 8, the waste heat boiler 10, and the high-temperature air pipeline 11 respectively through the oxidation device 6, the photovoltaic power station 17 is connected to the fan 5 through the fan photovoltaic cable 12, the photovoltaic heat storage cable 13 and the oxidation device 6, the network cable 16 and the mine substation respectively, the fan 5 is connected to the mine substation through the fan grid power cable 16, and the waste heat boiler 12 is connected to the heat exchange station through the hot water pipeline 9.

[0019] Refer to the attached Figure 2-Figure 3 The dehydration filter 3 mentioned in the present invention has a rated flow rate of 100,000 m3 of ventilation gas. 3 / h, with an inlet and outlet diameter of 1.7m, a central dehydration and filtration section with a square cross-section of 2.2m x 2.2m, and a total length of 3m. Its structure includes a self-overflowing drain valve 3-1, a housing 3-2, a water collection tank 3-3, a dehydration filter element 3-4, and winding columns 3-5. An air inlet pipe 3-6 is provided on one side of the housing 3-2, and an air outlet pipe 3-7 is provided on the other side. A water collection tank 3-3 is provided at the bottom of the housing 3-2. Within the inner cavity of the housing 3-2, there are dehydration filter elements 3-4 of one or more levels, which are mounted on multiple columns 3-5. A self-overflowing drain valve 3-1 is provided above the water collection tank 3-3.

[0020] Refer to the attached Figure 4 and Figure 5 The oxidation device mentioned in this invention has 6 beds and 10 valves, and the ventilation gas calibration processing capacity is 100,000 m 3 / h, methane oxidation destruction rate greater than 95%, total length 17m, total width 4.8m, total height 7.5m (of which the reversing mechanism is 3.2m high), each honeycomb ceramic chamber is 1m wide, 4.2m long and not less than 1.9m high, and a diesel burner is used as a backup heat source for starting the oxidation device 6. Its structure includes an electric heating rod 6-1, a high-temperature flue gas intake cover 6-2, a manhole 6-3, a honeycomb ceramic 6-4, a ceramic partition 6-5, an insulation module 6-6, a shell 6-7, a guide cover 6-8, a reversing mechanism 6-9, and a diesel burner 6-10. The inner cavity of the shell 6-7 is provided with a honeycomb ceramic 6-4, and the ceramic partition 6-5 horizontally separates the honeycomb ceramic 6-4 at equal intervals. A plurality of electric heating rods 6-1 are evenly inserted and installed on the top of the shell 6-7; a guide cover 6-8 is provided below the honeycomb ceramic 6-4, and a reversing mechanism 6-9 is provided at the lower part of the guide cover 6-8. At least two reversing mechanisms 6-9 are provided and are placed at the lowest part of the shell 6-7. The inner wall of the shell 6-7 is provided with an insulation module 6-6, the high-temperature flue gas intake cover 6-2 is provided in the middle of the top of the shell 6-7, the manhole 6-3 is provided on the side of the shell 6-7, and the diesel burner 6-10 is installed on the shell 6-7.

[0021] Refer to the attached Figure 6 and Figure 11 The reversing mechanism 6-9 mentioned in the present invention has a single calibrated ventilation gas flow capacity of 10,000 m 3 / h, total length 4.8m, total width 1.65m, total height 1.83m, left and right air cavity cross-section 1.52m×1.52m, inlet and exhaust pipe diameter 0.63m. Its structure includes valve box 6-9-1, power cylinder 6-9-2, guide shaft sleeve 6-9-3, grease nipple 6-9-4, guide bracket sleeve 6-9-5, valve shaft 6-9-6, valve body 6-9-7, sealing ring 6-9-8, buffer spring 6-9-9, valve plate 6-9-10, universal joint 6-9-11. The valve body 6-9-7 is a herringbone structure, with a set of valve boxes 6-9-1 connected on both sides. The power cylinder 6-9-2 is installed on one side of the valve box 6-9-1. In the middle of the side, the telescopic rod of the power cylinder 6-9-2 passes through the guide shaft sleeve 6-9-3 and the guide bracket sleeve 6-9-5 to connect with the valve shaft 6-9-6. The valve shaft 6-9-6 is connected to the valve plate 6-9-10 through the universal joint 6-9-11. Two buffer springs 6-9-9 are sleeved on the valve shaft 6-9-6 and are located on both sides of the valve plate 6-9-10. The guide bracket sleeve 6-9-5 is centrally connected to the valve box 6-9-1. The sealing ring 6-9-8 is installed on the outer end of the valve body 6-9-7.

[0022] Refer to the attached Figure 7 and Figure 8The honeycomb ceramic 6-4 mentioned in the present invention is a rectangular parallelepiped with a mounting boss 6-4-1 at the lower end. Its cross section is a square 6-4-2, and the honeycomb openings are square or hexagonal. The honeycomb openings stacked at the upper part in the oxidation device 6 are small in size and thin in wall thickness, such as: the holes are not larger than 1.4mm×1.4mm, and the wall thickness is 0.3mm. Its material contains metal oxide components with catalytic function; the honeycomb openings in the middle are large in size and thick in wall thickness, such as: the holes are mm×3mm, and the wall thickness is 1.0mm; the honeycomb openings in the lower part are medium in size, such as: the holes are 2.4mm×2.4mm, and the wall thickness is 0.6mm.

[0023] Refer to the attached Figure 9 The electric heating rod 6-1 mentioned in the present invention includes a power terminal 6-1-1, a mounting flange 6-1-2, and a heating resistance wire 6-1-3. The power terminal 6-1-1 is installed on the upper side of the mounting flange 6-1-2, and the heating resistance wire 6-1-3 is installed on the lower side of the mounting flange 6-1-2. The material of the heating resistance wire 6-1-3 has a maximum temperature resistance of 1400°C and can be used for a long time below 1200°C.

[0024] Preferably, explosion relief plates are installed on the sides of the above-mentioned deflectors 6-8.

[0025] Preferably, the above-mentioned air intake linkage mechanism 1 is connected to the main fan of the air shaft 1#, and the air intake linkage mechanism 2 is connected to the main fan of the air shaft 2#, and is switched for use during the maintenance and overhaul of the main fan of the air shaft. When the oxidation device 1 operates abnormally, the linkage mechanism switches to the exhaust gas discharge state to the air.

[0026] The method for using the photovoltaic-energy storage-oxidation ventilation gas methane destruction and utilization device mentioned in the present invention includes the following steps: 1. Photovoltaic power generation and energy storage process Depending on the use of available land, photovoltaic power stations 17 can be centrally or dispersedly set up near the main fan of the wind shaft. The photovoltaic power is converted into heat energy by the electric heating rod 6-1 built into the oxidation device 6 and stored in the honeycomb ceramic 6-4 with strong heat storage capacity. The exhaust gas is sent into the oxidation device 6 through the fan 5. The flow direction of the exhaust gas in the oxidation device 6 is periodically changed by the reversing mechanism 6-9, and the heat in the honeycomb ceramic 6-4 is pushed to the honeycomb ceramic 6-4 in the oxidation device 6. The honeycomb ceramic 6-4 presents a shape with gradually decreasing temperature from top to bottom, with the highest temperature not exceeding 1200°C. The average temperature of the clean low-temperature flue gas discharged is no higher than the original temperature of the exhaust gas entering the oxidation device 6 by 10°C throughout the day. During the period when photovoltaic power generation is not in progress, the heat stored in the honeycomb ceramic 6-4 continues to maintain the continuous oxidation and destruction of the ventilation gas; the surplus electricity during photovoltaic power generation can be fed back to the project power supply; the capacity of the photovoltaic power station 17 is configured according to the overall balance of ventilation gas concentration and mine electricity and heat load; 2. Ventilation gas dehydration, filtration and countercurrent oxidation process The exhaust gas from the main fan of the air shaft passes through the dehydration filter 3 to remove free water and most fine particles therein. The fan sends the purified exhaust gas into the oxidation device 6 through the reversing mechanism 6-9. After passing through the honeycomb ceramic 6-4, it is gradually preheated to a temperature above 950°C. The methane in the exhaust gas is quickly adsorbed in the upper honeycomb ceramic 6-4. Under the catalysis of the metal oxide in the honeycomb ceramic 6-4 and the action of high temperature, the methane is quickly oxidized and decomposed on the surface of the honeycomb ceramic 6-4, releasing heat and storing it in the honeycomb ceramic 6-4 on the leeward side. In this process, the residual coal dust and other harmful gases in the exhaust gas are also destroyed. After 60 to 100 seconds, the reversing mechanism 6-9 sequentially changes the flow direction of the exhaust gas in each honeycomb ceramic 6-4 for heat storage oxidation, and enters the next oxidation heat release and heat storage process. This cycle is repeated, and the methane in the exhaust gas is continuously oxidized and destroyed. 3. Heat extraction and utilization process The heat stored in the honeycomb ceramic 6-4 of the oxidation device 6 is then extracted from the high-temperature flue gas (approximately 950°C) through the high-temperature flue gas extraction cap 6-2 at the top of the oxidation device 6 as the fan 5 delivers the exhaust gas into the oxidation device 6 and the reversing mechanism 6-9 redirects the exhaust gas flow through the honeycomb ceramic 6-4. Steam or hot water is generated in a waste heat boiler and then delivered to the mine heat exchange station to provide heat for production and daily life in the coal mine. During winter in northern coal mines or when temperatures drop below 0°C, mines with suitable conditions (such as those with close proximity between the vent and return air shaft) can directly deliver the clean, low-temperature, oxidized flue gas to the mine air inlet to preheat the incoming air and prevent icing at the wellhead.

[0027] Example 2, refer to the attached Figure 10 and Figure 11 The photovoltaic-energy storage-oxidation ventilation gas methane destruction and utilization device mentioned in the present invention, on the basis of other technical links and devices remaining unchanged, in order to increase the methane oxidation destruction rate to nearly 100%, invented a reversing mechanism 6-9 with a purge function. Compared with the reversing mechanism without a purge function, it adds the function of blowing the methane that has not been oxidized in the honeycomb ceramic chamber and the airflow channel due to the reversing of the airflow through the low-temperature flue gas after reflow to the oxidation area for oxidation and destruction. The total height is 2.52m.

[0028] It consists of a valve box 6-9-1, a power cylinder 6-9-2, a guide sleeve 6-9-3, a grease nipple 6-9-4, a guide bracket sleeve 6-9-5, a valve shaft 6-9-6, a valve body 6-9-7, a sealing ring 6-9-8, a buffer spring 6-9-9, a valve plate 6-9-10, a universal joint 6-9-11, and a purge valve 6-9-12. The valve body 6-9-7 is a herringbone structure, with a set of valve boxes 6-9-1 connected on both sides. The power cylinder 6-9-2 is installed in the valve box 6- In the middle of one side of 9-1, the telescopic rod of the power cylinder 6-9-2 passes through the guide shaft sleeve 6-9-3 and the guide bracket sleeve 6-9-5 to connect with the valve shaft 6-9-6. The valve shaft 6-9-6 is connected to the valve plate 6-9-10 through the universal joint 6-9-11. Two buffer springs 6-9-9 are sleeved on the valve shaft 6-9-6 and located on both sides of the valve plate 6-9-10. The guide bracket sleeve 6-9-5 is centrally connected to the valve box 6-9-1. The sealing ring 6-9-8 is installed on the outer end of the valve body 6-9-7. Among them, the purge valve 6-9-12 is connected to the upper side of the valve body 6-9-7. The structure inside the purge valve 6-9-12 is the same as the structure inside the valve box 6-9-1, which also includes a power cylinder 6-9-2, a guide shaft sleeve 6-9-3, a grease nipple 6-9-4, a guide bracket sleeve 6-9-5, a valve shaft 6-9-6, a sealing ring 6-9-8, a buffer spring 6-9-9, a valve plate 6-9-10, and a universal joint 6-9-11. Compared with the reversing mechanism without a purge function, the function of purging the honeycomb ceramic chamber to transfer unoxidized methane to the oxidation area during the airflow reversal is added. The total height is 2.52m, thereby realizing the function of being suitable for methane oxidation destruction close to 100%.

[0029] The above descriptions are merely some preferred embodiments of the present invention. Anyone skilled in the art may be able to modify the above-described technical solutions or convert them into equivalent technical solutions. Therefore, any corresponding simple modifications or equivalent transformations based on the technical solutions of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A photovoltaic-energy storage-oxidation ventilation gas methane destruction and utilization device, characterized by: The invention comprises an air intake linkage mechanism (1), an air intake linkage mechanism (2), a dehydration filter (3), a ventilation gas pipeline (4), a fan (5), an oxidation device (6), a mine air inlet pipeline (7), a low-temperature exhaust pipeline (8), a hot water pipeline (9), a waste heat boiler (10), a high-temperature air pipeline (11), a fan photovoltaic cable (12), a photovoltaic heat storage cable (13), a grid power heating cable (14), an internet cable (15), a fan grid power cable (16), and a photovoltaic power station (17). The air intake linkage mechanism (1) or the air intake linkage mechanism (2), The dehydration filter (3), the fan (5), and the oxidation device (6) are connected. The exhaust gas is connected to the mine air inlet duct (7), the low-temperature exhaust duct (8), the waste heat boiler (10), and the high-temperature air duct (11) respectively through the oxidation device (6). The photovoltaic power station (17) is connected to the fan (5) through the fan photovoltaic cable (12), the photovoltaic heat storage cable (13) is connected to the oxidation device (6), and the network cable (16) is connected to the mine substation. The fan (5) is connected to the mine substation through the fan network cable (16). The waste heat boiler (12) is connected to the heat exchange station through the hot water pipe (9).

2. The photovoltaic-energy storage-oxidation ventilation gas methane destruction and utilization device according to claim 1 is characterized by: The dehydration filter (3) comprises a self-overflowing drain valve (3-1), a shell (3-2), a water collecting tank (3-3), a dehydration filter core (3-4), and winding columns (3-5). An air inlet pipe (3-6) is provided on one side of the shell (3-2), and an air outlet pipe (3-7) is provided on the other side. A water collecting tank (3-3) is provided at the lower part of the shell (3-2). More than one level of dehydration filter cores (3-4) are provided in the inner cavity of the shell (3-2). The dehydration filter cores (3-4) are installed on multiple columns (3-5). A self-overflowing drain valve (3-1) is provided on the upper side of the water collecting tank (3-3).

3. The photovoltaic-energy storage-oxidation ventilation gas methane destruction and utilization device according to claim 2 is characterized by: The oxidation device (6) includes an electric heating rod (6-1), a high-temperature flue gas intake cover (6-2), a manhole (6-3), a honeycomb ceramic (6-4), a ceramic partition (6-5), a heat preservation module (6-6), a shell (6-7), a flow guide cover (6-8), a reversing mechanism (6-9), and a diesel burner (6-10). The shell (6-7) has an inner cavity provided with a honeycomb ceramic (6-4), and the ceramic partition (6-5) divides the honeycomb ceramic (6-4) horizontally at equal intervals. A plurality of electric heating rods (6-1) are arranged on the top of the shell (6-7). Uniformly distributed insertion installation; a guide cover (6-8) is provided below the honeycomb ceramic (6-4); a reversing mechanism (6-9) is provided at the lower portion of the guide cover (6-8); at least two reversing mechanisms (6-9) are provided and are placed at the lowest portion of the shell (6-7); a heat preservation module (6-6) is provided on the inner wall of the shell (6-7); a high-temperature flue gas intake cover (6-2) is provided in the middle of the top of the shell (6-7); a manhole (6-3) is provided on the side of the shell (6-7); and a diesel burner (6-10) is installed on the shell (6-7).

4. The photovoltaic-energy storage-oxidation ventilation gas methane destruction and utilization device according to claim 3 is characterized by: The reversing mechanism (6-9) includes a valve box (6-9-1), a power cylinder (6-9-2), a guide shaft sleeve (6-9-3), a grease nipple (6-9-4), a guide bracket sleeve (6-9-5), a valve shaft (6-9-6), a valve body (6-9-7), a sealing ring (6-9-8), a buffer spring (6-9-9), a valve plate (6-9-10), and a universal joint (6-9-11). The valve body (6-9-7) is a herringbone structure, and its two sides are respectively connected to a group of valve boxes (6-9-1). The power cylinder (6-9-2) is installed in the valve box (6-9-1). In the middle of one side of the valve body (6-9-1), the telescopic rod of the power cylinder (6-9-2) passes through the guide shaft sleeve (6-9-3) and the guide bracket sleeve (6-9-5) and is connected to the valve shaft (6-9-6). The valve shaft (6-9-6) is connected to the valve plate (6-9-10) through a universal joint (6-9-11). Two buffer springs (6-9-9) are sleeved on the valve shaft (6-9-6) and are located on both sides of the valve plate (6-9-10). The guide bracket sleeve (6-9-5) is centrally connected to the valve box (6-9-1). The sealing ring (6-9-8) is installed on the outer end of the valve body (6-9-7).

5. The photovoltaic-energy storage-oxidation ventilation gas methane destruction and utilization device according to claim 4 is characterized by: The honeycomb ceramic (6-4) is a rectangular parallelepiped with a mounting boss (6-4-1) at the lower end. Its cross section is square (6-4-2). The honeycomb openings are square or hexagonal. The honeycomb openings stacked at the upper portion in the oxidation device (6) are small in size and thin in wall thickness, and the material contains a metal oxide component with catalytic function; the honeycomb openings in the middle portion are large in size and thick in wall thickness; and the honeycomb openings in the lower portion are medium in size.

6. The photovoltaic-energy storage-oxidation ventilation gas methane destruction and utilization device according to claim 5 is characterized by: The electric heating rod (6-1) comprises an electrical terminal (6-1-1), a mounting flange (6-1-2), and a heating resistance wire (6-1-3). The electrical terminal (6-1-1) is mounted on the upper side of the mounting flange (6-1-2), and the heating resistance wire (6-1-3) is mounted on the lower side of the mounting flange (6-1-2). The heating resistance wire (6-1-3) is made of 0Cr27Al7Mo2 and has a cylindrical appearance after folding. The maximum temperature resistance is 1400°C.

7. The photovoltaic-energy storage-oxidation ventilation gas methane destruction and utilization device according to claim 3 is characterized by: An explosion relief plate is installed on the side of the deflector cover (6-8).

8. The photovoltaic-energy storage-oxidation ventilation gas methane destruction and utilization device according to claim 1 is characterized by: The air intake linkage mechanism (1) is connected to the main fan of the air shaft 1#, and the air intake linkage mechanism (2) is connected to the main fan of the air shaft 2#. They are switched for use during the maintenance and overhaul of the main fan of the air shaft. When the oxidation device (1) is not operating normally, the linkage mechanism is switched to the state of exhaust gas discharge to the air.

9. The photovoltaic-energy storage-oxidation ventilation gas methane destruction and utilization device according to claim 8 is characterized by: The reversing mechanism (6-9) further includes a purge valve (6-9-12), the purge valve (6-9-12) being connected to the upper side of the valve body (6-9-7), and the purge valve (6-9-12) being provided with a power cylinder (6-9-2), a guide sleeve (6-9-3), a grease nipple (6-9-4), a guide bracket sleeve (6-9-5), a valve shaft (6-9-6), a buffer spring (6-9-9), a valve plate (6-9-10) and a universal joint (6-9-11).

10. The method for using the photovoltaic-energy storage-oxidation ventilation gas methane destruction and utilization device according to any one of claims 1 to 9, characterized in that: The following processes are included:

1. Photovoltaic power generation and energy storage process According to the use of available land, photovoltaic power stations (17) can be centrally or dispersedly set up near the main fan of the wind shaft. Photovoltaic electricity is converted into heat energy through the electric heating rod (6-1) built into the oxidation device (6) and stored in the honeycomb ceramic (6-4) with strong heat storage capacity; the exhaust gas is sent into the oxidation device (6) through the fan (5), and the flow direction of the exhaust gas in the oxidation device (6) is periodically changed through the reversing mechanism (6-9), so that the heat in the honeycomb ceramic (6-4) is pushed to the honeycomb ceramic (6-4) in the oxidation device (6). The honeycomb ceramic (6-4) presents a shape with a gradually lower temperature from top to bottom, and the highest temperature does not exceed 1200°C. The temperature of the clean low-temperature flue gas discharged is not higher than the original temperature of the exhaust gas entering the oxidation device (6) by 10°C. During the period when photovoltaic power generation is not in progress, the heat stored in the honeycomb ceramic (6-4) continues to maintain the continuous oxidation and destruction of the ventilation gas; the surplus electricity during photovoltaic power generation can be fed back to the project power supply; the capacity of the photovoltaic power station (17) is configured according to the overall balance of ventilation gas concentration and mine electricity and heat load; 2. Ventilation gas dehydration, filtration and countercurrent oxidation process The exhaust gas from the main fan of the wind shaft passes through the dehydration filter (3) to remove the free water and most of the fine particles therein. The fan sends the purified exhaust gas to the oxidation device (6) through the reversing mechanism (6-9). After passing through the honeycomb ceramic (6-4), it is gradually preheated to a temperature above 950°C. The methane in the exhaust gas is quickly adsorbed in the upper honeycomb ceramic (6-4). Under the catalysis of the metal oxide in the honeycomb ceramic (6-4) and the high temperature, the methane is quickly oxidized and decomposed on the surface of the honeycomb ceramic (6-4), releasing heat and storing it in the honeycomb ceramic (6-4) on the downwind side. In this process, the residual coal dust and other harmful gases in the exhaust gas are also destroyed and processed. After 60 to 100 seconds, the reversing mechanism (6-9) sequentially changes the flow direction of the exhaust gas in each honeycomb ceramic (6-4) for heat storage oxidation, and enters the next oxidation heat release and heat storage process. This cycle is repeated, and the methane in the exhaust gas is continuously oxidized and destroyed.

3. Heat extraction and utilization process The heat stored in the honeycomb ceramic (6-4) of the oxidation device (6) is taken out from the high-temperature flue gas cover (6-2) on the top of the oxidation device (6) during the process of the fan (5) sending the exhaust gas into the oxidation device (6) and the reversing mechanism (6-9) changing the flow direction of the exhaust gas in the honeycomb ceramic (6-4). The high-temperature flue gas of about 950°C is produced through the waste heat boiler to produce steam or hot water, which is sent to the mine heat exchange station to provide heat source for coal mine production and life; in addition, when the temperature is below 0 degrees in winter, the clean low-temperature flue gas after oxidation is directly sent to the mine air inlet to preheat the mine air intake to prevent the wellhead from freezing.

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