A coal mine ventilation air methane oxidation device

Abstract

The present invention discloses a device for oxidizing exhausted mine gas, which relates to the technical field of gas oxidation. It includes an outer housing, a base is fixedly installed at the bottom end of the outer housing, an inner housing is fixedly installed on the inner wall of the outer housing, a first threaded air groove and a second threaded air groove are fixedly installed on the inner wall of the inner housing. The base and the outer housing form the main structure of the device, and there is still a gap between the outer housing and the inner housing. This gap can be filled with heat-insulating materials to reduce heat loss. And when the exhausted mine gas flows, it will pass through the first threaded air groove and the second threaded air groove. The first threaded air groove and the second threaded air groove can increase the residence time of the exhausted mine gas in the inner housing, so that the exhausted mine gas can be sufficiently preheated and oxidized in the inner housing. Thus, without increasing the overall volume of the device, the oxidation degree of the exhausted mine gas can be increased, solving the problem that the prior art can only choose one between space and energy consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of gas oxidation, and specifically to a coal mine ventilation air methane oxidation device. Background Art

[0002] Coal mine ventilation air methane, also known as coal mine exhaust methane, refers to the waste gas with a methane concentration lower than 0.75% discharged from the mine ventilation system. During the coal mine production process, a large amount of ventilation is required to remove methane, harmful gases and dust, while providing fresh air. During this process, the operation of internal equipment in the mine and the self-heating of ore increase the air temperature, forming waste gas with heat, that is, ventilation air.

[0003] The main components of ventilation air include oxygen, nitrogen, water vapor in the air, and a small amount of harmful gases such as methane and carbon dioxide. The temperature of ventilation air is usually higher than the external environmental temperature and has a certain heat energy value; however, the methane concentration is extremely low, and the utilization technology is difficult. For a long time, it can only be completely discharged into the atmosphere, causing greenhouse gas pollution.

[0004] Currently, the common treatment of ventilation air methane usually uses catalytic combustion technology to treat low-concentration methane, thereby achieving the oxidation of methane and reducing pollutant emissions.

[0005] The conventional treatment method is to extract the ventilation air methane in the coal mine shaft through a ventilator and inject it into a treatment tank, and use heating equipment in the treatment tank to heat it to oxidize methane. However, this measure has a drawback. When the ventilation air methane is just extracted from the mine shaft, the temperature of the gas usually remains between 2°C and 30°C, and the specific temperature needs to be determined according to the actual situation in the mine. However, to quickly heat and oxidize the ventilation air methane, the air needs to be preheated. However, conventional preheating will increase the space occupied by the equipment. In order to reduce the overall size of the oxidation equipment, usually several heating equipment are added to increase the heating speed, but this method is undoubtedly more energy-consuming. Therefore, the existing technology can only choose one between space and energy consumption. Summary of the Invention

[0006] The purpose of the present invention is to provide a coal mine ventilation air methane oxidation device to solve the problems proposed in the existing technology.

[0007] To achieve the above purpose, the present invention provides the following technical solution: A coal mine ventilation air methane oxidation device includes an outer housing, a base is fixedly installed at the bottom end of the outer housing, an inner housing is fixedly installed on the inner wall of the outer housing, and a first threaded air groove and a second threaded air groove are fixedly installed on the inner wall of the inner housing;

[0008] A preheating cylinder is fixedly installed on the inner surface of the first threaded air groove, and a groove is opened inside the first threaded air groove, and the groove is in mutual communication with the inside of the preheating cylinder;

[0009] Two diversion pipes and two heating rods are arranged inside the second spiral air duct. A heating cylinder is fixedly installed on the inner wall of the second spiral air duct, and a coil is fixedly installed on the inner wall of the heating cylinder;

[0010] Several heat conduction meshes are installed on the outer surface of the second spiral air duct, and the heat conduction meshes are connected to the outer surfaces of the heating rods and the diversion pipes.

[0011] Preferably, an air inlet pipe is arranged inside the base, a top shell is fixedly installed at the top end of the outer shell, and an exhaust port is arranged inside the top shell.

[0012] Preferably, a diversion shell is fixedly installed on the inner top wall of the preheating cylinder. A mounting frame is fixedly installed on the inner wall of the diversion shell, a water pump is fixedly installed on the outer surface of the mounting frame, and the output end of the water pump is fixedly installed with the inner wall of the diversion shell.

[0013] Preferably, a water pipe 1 is fixedly installed at the input end of the diversion shell. The outer surface of the water pipe 1 is fixedly installed with the inner wall of the diversion shell, and the water pipe 1 passes through the heating cylinder and is located at the center of the coil.

[0014] Preferably, the top end of the water pipe 1 is connected to the top end of the diversion pipe, and the inside of the water pipe 1 is communicated with the inside of the diversion pipe.

[0015] Preferably, a water pipe 2 is fixedly installed at the bottom end of the diversion pipe. The other end of the water pipe 2 is fixedly installed on the outer surface of the preheating cylinder, and the inside of the water pipe 2 is communicated with the space between the preheating cylinder and the diversion shell.

[0016] Preferably, a flow dividing plate is fixedly installed at the bottom end of the preheating cylinder, and several air vents are circularly arranged inside the flow dividing plate.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1. Through the cooperation among the inner shell, the first spiral air duct, the second spiral air duct, the outer shell and the base, the base and the outer shell form the main structure of the device, and there is a gap between the outer shell and the inner shell. This gap can be filled with heat insulation materials to reduce heat loss. During the circulation of exhausted air and gas, it will pass through the first spiral air duct and the second spiral air duct. The first spiral air duct and the second spiral air duct can increase the residence time of the exhausted air and gas in the inner shell, so that the exhausted air and gas can be sufficiently preheated and oxidized in the inner shell. Thus, without increasing the overall volume of the device, the oxidation degree of the exhausted air and gas can be increased, solving the problem that the prior art can only choose one between space and energy consumption.

[0019] 2. Through the cooperation among the second threaded air duct, the heating rod and the diversion pipe in this application, the heat dissipated by the heating rod can heat and oxidize the exhausted air gas near the central area through the heat conduction net, thereby improving the heating efficiency.

[0020] 3. Through the cooperation among the diversion pipe, the second water pipe, the preheating cylinder, the drainage shell, the first water pipe and the water pump in this application, the heat conduction liquid in the preheating cylinder can enter the diversion pipe through the second water pipe, flow upward in a spiral shape to the first water pipe, and then enter the next cycle of flow under the drive of coil heating and the water pump. Brief Description of the Drawings

[0021] Figure 1 It is a schematic diagram of the external structure of an oxidized device for exhausted air gas in coal mines according to the present invention;

[0022] Figure 2 It is a schematic diagram of the structure of the outer shell and the inner shell of an oxidized device for exhausted air gas in coal mines according to the present invention;

[0023] Figure 3 It is a schematic diagram of the overall internal structure inside the inner shell of an oxidized device for exhausted air gas in coal mines according to the present invention;

[0024] Figure 4 It is a schematic diagram of the structure of the heating cylinder and the preheating cylinder of the inner shell of an oxidized device for exhausted air gas in coal mines according to the present invention;

[0025] Figure 5 It is a schematic diagram of the internal structure of the preheating cylinder of an oxidized device for exhausted air gas in coal mines according to the present invention;

[0026] Figure 6 It is a schematic diagram of the internal planar structure of the heating cylinder of an oxidized device for exhausted air gas in coal mines according to the present invention;

[0027] Figure 7 It is a schematic diagram of the structure of the first threaded air duct and the second threaded air duct of an oxidized device for exhausted air gas in coal mines according to the present invention;

[0028] Figure 8 It is a schematic diagram of the overall internal cross-section of an oxidized device for exhausted air gas in coal mines according to the present invention;

[0029] Figure 9 It is a schematic diagram of the installation position of the heat conduction net of an oxidized device for exhausted air gas in coal mines according to the present invention.

[0030] Reference numerals in the drawings: 1. Outer shell; 2. Base; 3. Inner shell; 4. First threaded air duct; 5. Second threaded air duct; 6. Groove; 7. Preheating cylinder; 8. Diversion pipe; 9. Heating rod; 10. Heating cylinder; 11. Coil; 12. Intake pipe; 13. Top shell; 14. Drainage shell; 15. Mounting rack; 16. Water pump; 17. First water pipe; 18. Second water pipe; 19. Flow dividing plate; 20. Ventilation opening. Detailed implementation mode

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] Embodiment: As Figures 1-9 shown, the present invention provides a technical solution for a coal mine ventilation air methane oxidation device, including an outer housing 1. A base 2 is fixedly installed at the bottom end of the outer housing 1. An inner housing 3 is fixedly installed on the inner wall of the outer housing 1. A first threaded air groove 4 and a second threaded air groove 5 are fixedly installed on the inner wall of the inner housing 3. The base 2 and the outer housing 1 constitute the main structure of the device. Moreover, a gap is reserved between the outer housing 1 and the inner housing 3. This gap can be filled with heat insulation materials to reduce heat loss. And during the flow of ventilation air methane, it will pass through the first threaded air groove 4 and the second threaded air groove 5. The first threaded air groove 4 and the second threaded air groove 5 can increase the residence time of ventilation air methane in the inner housing 3, enabling the ventilation air methane to be sufficiently preheated and oxidized in the inner housing 3. Thus, without increasing the overall volume of the device, the oxidation degree of ventilation air methane can be increased, solving the problem that the prior art can only choose one between space and energy consumption.

[0033] A preheating cylinder 7 is fixedly installed on the inner surface of the first threaded air groove 4. A groove 6 is formed inside the first threaded air groove 4. The inside of the groove 6 is in communication with the inside of the preheating cylinder 7. The preheating cylinder 7 is filled with a heat-conducting liquid. The heat-conducting liquid can flow in the first threaded air groove 4 through the groove 6, and thus can preheat the ventilation air methane flowing through the first threaded air groove 4.

[0034] Two flow guide pipes 8 and two heating rods 9 are provided inside the second threaded air groove 5. A heating cylinder 10 is fixedly installed on the inner wall of the second threaded air groove 5. A coil 11 is fixedly installed on the inner wall of the heating cylinder 10. The heating rod 9 can heat and oxidize the ventilation air methane flowing through the second threaded air groove 5. The flow guide pipe 8 can also assist in heating the ventilation air methane that has not been fully preheated to increase its heating rate. The coil 11 is an overall high-frequency induction heating device and can quickly heat the inside thereof using a magnetic field. The cooperation between the heating cylinder 10 and the second threaded air groove 5 can guide the ventilation air methane to flow in a spiral upward manner.

[0035] Several heat-conducting nets are installed on the outer surface of the second threaded air groove 5. The heat-conducting nets are connected to the outer surfaces of the heating rod 9 and the flow guide pipe 8. The heat emitted by the heating rod 9 can heat and oxidize the ventilation air methane near the central area through the heat-conducting nets, thereby improving the heating efficiency.

[0036] An air inlet pipe 12 is provided inside the base 2. A top shell 13 is fixedly installed at the top end of the outer housing 1. An exhaust port is provided inside the top shell 13. An external fan can suck the exhausted air gas in the mine into the air inlet pipe 12 through the air inlet pipe 12, and enter the inner bottom of the inner housing 3 through the air inlet pipe 12. After being heated and oxidized layer by layer, it is then connected to the next-stage treatment equipment through the exhaust port of the top shell 13.

[0037] A drainage shell 14 is fixedly installed on the inner top wall of the preheating cylinder 7. A mounting frame 15 is fixedly installed on the inner wall of the drainage shell 14. A water pump 16 is fixedly installed on the outer surface of the mounting frame 15. The output end of the water pump 16 is fixedly installed with the inner wall of the drainage shell 14. The space between the drainage shell 14 and the preheating cylinder 7 is used for the flow of the heat-conducting liquid. The water pump 16 can pour the heat-conducting liquid downward into the lower part of the drainage shell 14, and enter the position between the drainage shell 14 and the preheating cylinder 7 and flow upward. The mounting frame 15 can provide support for the water pump 16. While the heat-conducting liquid is flowing upward, it can also preheat the exhausted air gas passing through it through the first spiral air groove 4.

[0038] A water pipe 17 is fixedly installed at the input end of the drainage shell 14. The outer surface of the water pipe 17 is fixedly installed with the inner wall of the drainage shell 14. The water pipe 17 passes through the heating cylinder 10 and is located at the center of the coil 11. The water pipe 17 is made of copper, and can heat the heat-conducting liquid inside the water pipe 17 to 100 degrees Celsius, and make the heated liquid enter continuous cyclic heating through the water pump 16.

[0039] A water pipe 18 is fixedly installed at the bottom end of the diversion pipe 8. The other end of the water pipe 18 is fixedly installed on the outer surface of the preheating cylinder 7. The inside of the water pipe 18 communicates with the space between the preheating cylinder 7 and the drainage shell 14. The top end of the water pipe 17 is connected to the top end of the diversion pipe 8. The inside of the water pipe 17 and the inside of the diversion pipe 8 are mutually communicated. The heat-conducting liquid in the preheating cylinder 7 can enter the diversion pipe 8 through the water pipe 18, flow spirally upward to the water pipe 17, and then enter the next cyclic flow under the heating of the coil 11 and the drive of the water pump 16.

[0040] A flow dividing plate 19 is fixedly installed at the bottom end of the preheating cylinder 7. A plurality of ventilation openings 20 are circularly arrayed inside the flow dividing plate 19. When the exhausted air gas just enters the lower position inside the inner cylinder body, it will enter the upper part of the flow dividing plate 19 through the ventilation openings 20 provided on the flow dividing plate 19, and sequentially pass through the first spiral air groove 4 and the second spiral air groove 5. The flow dividing plate 19 can provide support for the preheating cylinder 7, and provide support for the water pump 16 inside through the preheating cylinder 7.

[0041] It is obvious to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, in any respect, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Thus, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

Claims

1. A coal mine ventilation gas oxidation device, characterized in that: It comprises an outer shell (1), a base (2) is fixedly mounted on the bottom end of the outer shell (1), an inner shell (3) is fixedly mounted on the inner wall of the outer shell (1), and a first threaded air slot (4) and a second threaded air slot (5) are fixedly mounted on the inner wall of the inner shell (3); A preheating cylinder (7) is fixedly mounted on the inner surface of the threaded air groove (4), a groove (6) is provided inside the threaded air groove (4), and the groove (6) is communicated with the interior of the preheating cylinder (7); Two guide tubes (8) and two heating rods (9) are provided inside the second threaded air slot (5); a heating cylinder (10) is fixedly mounted on the inner wall of the second threaded air slot (5); and a coil (11) is fixedly mounted on the inner wall of the heating cylinder (10); The outer surface of the second threaded air slot (5) is provided with a plurality of heat-conducting nets, and the heat-conducting nets are connected to the outer surface of the heating rod (9) and the guide tube (8); A drainage shell (14) is fixedly mounted on the inner top wall of the preheating cylinder (7); a water pipe (17) is fixedly mounted on the input end of the drainage shell (14); the outer surface of the water pipe (17) is fixedly mounted on the inner wall of the drainage shell (14); the water pipe (17) passes through the heating cylinder (10) and is located at the center of the coil (11); The top end of the water pipe 1 (17) is connected to the top end of the guide pipe (8), the interior of the water pipe 1 (17) and the interior of the guide pipe (8) are mutually connected, and the bottom end of the guide pipe (8) is fixedly installed with a water pipe 2 (18), the other end of the water pipe 2 (18) is fixedly installed on the outer surface of the preheating cylinder (7), and the interior of the water pipe 2 (18) is connected to the space between the preheating cylinder (7) and the drainage shell (14).

2. A coal mine ventilation gas oxidation device according to claim 1, characterized in that: An air inlet pipe (12) is provided inside the base (2), a top shell (13) is fixedly mounted on the top of the outer shell (1), and an exhaust port is provided on the inner side of the top shell (13).

3. A coal mine ventilation gas oxidation device according to claim 1, characterized in that: A mounting frame (15) is fixedly mounted on the inner wall of the drainage shell (14), a water pump (16) is fixedly mounted on the outer surface of the mounting frame (15), and an output end of the water pump (16) is fixedly mounted on the inner wall of the drainage shell (14).

4. A coal mine exhaust gas oxidation device according to claim 1, characterized in that: A diverter plate (19) is fixedly mounted on the bottom end of the preheating cylinder (7), and a plurality of vents (20) are provided in a circular array on the inner side of the diverter plate (19).

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