Gas extraction device for mining area

Abstract

The utility model relates to the technical field of gas extraction equipment, in particular to a gas extraction device for a mining area. Comprising a water ring type vacuum pump, one side of the water ring type vacuum pump is connected with a speed reducer and a driving motor in sequence, the upper end of the water ring type vacuum pump is further connected with a gas-water separator through a steel pipe, and a butterfly valve switch is further arranged on the steel pipe. The upper end of the gas-water separator is sequentially connected with a negative pressure compensator, a fire retardant device, an anti-backfire device, an anti-air-return device and a slag discharger through steel pipes, a flow meter is further arranged in the middle of a pipeline, and a flange is further installed at the lower end of the gas-water separator; the flange is sequentially connected with an elbow, a backwater prevention device, a fire retardant device, a backfire prevention device and a positive pressure compensator, a butterfly valve switch is further arranged between the elbow and the backfire prevention device, and a sensor is further arranged in the device. According to the utility model, inspection and gas production analysis and measurement can be carried out, natural ignition is prevented, the drainage negative pressure can be controlled, and the quality of the collected gas is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of gas extraction equipment, in particular to a gas extraction device for a mining area. Background Art

[0002] In order to improve the safety of coal mining and relieve production pressure, underground gas extraction methods have been adopted since the 1950s. By the end of 1999, 158 coal mines in China had established underground extraction systems and ground gas transmission and distribution systems, with an annual extraction volume of 798 million m³, of which Fushun and Yangquan mining areas each had an annual extraction volume of more than 100 million m³, and the extraction volume of coalbed methane in Panjiang, Pingdingshan and Huainan increased rapidly. The development of coalbed methane ground wells in coal mining areas is also very active, and the coalbed methane development pilot projects in Jincheng, Tiefa and Huaibei have shown good development prospects. Coal mine gas extraction is not only an important measure to reduce the amount of gas outburst in mines, prevent gas explosions and coal and gas outburst disasters, but also can turn harm into benefit and be developed and utilized as a coal-associated resource.

[0003] There are two main sources of gas: one is a certain amount of residual gas in the coal that has not been mined and is left in the goaf; the other is gas in the roof and surrounding coal rock. The long-drilling gas extraction technology in the roof has been tested and adopted in many mining areas. Under the condition of reasonable hole layout parameters, a better extraction effect can be achieved, and it is possible to replace the high-extraction lane. In terms of reducing the extraction cost, especially for the high-extraction lane, the long-drilling extraction technology has an unquestionable advantage. However, since the permeability of the surrounding rock in the mining area is greatly improved due to mining, it is easy for air to enter the mining area. Secondly, the extracted gas contains tiny particles that are easy to spontaneously ignite at high temperatures, and it will also reduce the concentration of the extracted gas and cause the coal in the goaf to spontaneously ignite. Utility Model Content

[0004] The utility model aims to provide a gas extraction device in a mining area, which can perform inspection, gas extraction analysis and measurement, prevent spontaneous combustion, control the extraction negative pressure, and ensure the quality of the extracted gas.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a gas extraction device in a mining area, comprising a water ring vacuum pump, one side of the water ring vacuum pump is sequentially connected to a reducer and a drive motor, the upper end of the water ring vacuum pump is also connected to a gas-water separator through a steel pipe, and a butterfly valve switch is also arranged on the steel pipe, the upper end of the gas-water separator is sequentially connected to a negative pressure compensator, a fire arrester, an anti-backfire device, an anti-backfire device and a slag discharger through a steel pipe, wherein a flow meter is also arranged in the middle of the pipeline, and a flange is also installed at the lower end of the gas-water separator, and an elbow, an anti-backfire device, a fire arrester, an anti-backfire device and a positive pressure compensator are sequentially connected to the flange, a butterfly valve switch is also arranged between the elbow and the anti-backfire device, and a sensor is also arranged in the above-mentioned device.

[0006] Furthermore, the inner wall of the pipeline is provided with a drag-reducing and wear-resistant coating, and the outer surface is provided with a chlorinated rubber paint.

[0007] Furthermore, the water ring vacuum pump and the fire-blocking device are horizontally arranged on the ground, and the remaining devices and steel pipes are installed and laid along the slope of the tunnel.

[0008] Furthermore, the steel pipes are laid by hanging from the top plate when at a high place, and are laid using pipe supports at a low place, and the hanging interval is not less than 3 meters.

[0009] Furthermore, the sensors include a flow sensor, a gas sensor, a temperature sensor, a negative pressure sensor, a temperature sensor and a water level sensor.

[0010] Furthermore, the negative pressure compensator and the positive pressure compensator are drain devices, and the steel pipes are installed obliquely with respect to the two to prevent water backflow.

[0011] The beneficial effects of the utility model are: 1) the utility model draws the underground gas upwards through the water ring vacuum pump, and after separation treatment by various levels of equipment, the gas passes through the upper steel pipe for further treatment, and the residue passes through the lower steel pipe for subsequent treatment. During the process, the various sensors in the steel pipe detect the concentration and temperature in real time to prevent high-temperature spontaneous combustion. After passing through the compensator, the gas or residue is promptly injected with water for treatment, so as to collect pure gas or cool and clean the residual coal slag to prevent spontaneous combustion. The structure is simple and easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the utility model.

[0013] Figure 2 This is the connection diagram of the upper end pipeline of the gas-water separator.

[0014] Figure 3 This is the connection diagram of the lower end pipeline of the gas-water separator.

[0015] In the figure: 1. Water ring vacuum pump; 2. Reducer; 3. Drive motor; 4. Steel pipe; 5. Gas-water separator; 6. Butterfly valve switch; 7. Negative pressure compensator; 8. Flame arrester; 9. Anti-backfire device; 10. Anti-backgas device; 11. Slag discharger; 12. Flow meter; 13. Flange; 14. Elbow; 15. Positive pressure compensator. DETAILED DESCRIPTION

[0016] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments.

[0017] Embodiment: As shown in the figure, the utility model of a mining area gas extraction device comprises

[0018] A water ring vacuum pump 1, wherein one side of the water ring vacuum pump 1 is sequentially connected to a reducer 2 and a drive motor 3, the upper end of the water ring vacuum pump 1 is also connected to a gas-water separator 5 through a steel pipe 4, and a butterfly valve switch 6 is also provided on the steel pipe 4, and the upper end of the gas-water separator 5 is sequentially connected to a negative pressure compensator 7, a fire arrester 8, an anti-backfire device 9, an anti-backflow device 10 and a slag discharger 11 through the steel pipe 4, wherein a flow meter 12 is also provided in the middle of the pipeline, and a flange 13 is also installed at the lower end of the gas-water separator 5, and an elbow 14, an anti-backflow device, a fire arrester 8, an anti-backflow device 9 and a positive pressure compensator 15 are sequentially connected to the flange 13, and a butterfly valve switch 6 is also provided between the elbow 14 and the anti-backfire device 9, and a sensor is also provided in the above-mentioned device.

[0019] The inner wall of the pipeline is provided with drag-reducing and wear-resistant coating, and the outer surface is provided with chlorinated rubber paint. The steel pipe 4 is made of spiral welded pipe. After the internal rust of the pipeline is removed, the internal anti-corrosion operation is carried out. YM-138 internal drag-reducing and wear-resistant coating is used. When the outer surface of the pipe is anti-corroded, two coats of chlorinated rubber primer are first applied, and then a coat of topcoat is applied. This can effectively prevent hydrogen sulfide and other components in the extracted gas from entering the pipeline, affecting the service life of the pipeline and causing gas leakage.

[0020] The water ring vacuum pump 1 and the fire arrester 8 are horizontally arranged on the ground, and the other devices and the steel pipe 4 are installed and laid along the slope of the tunnel. The water ring vacuum pump 1 and the gas-water separator 5 are fastened on the horizontal plane by anchor bolts and nuts.

[0021] The steel pipe 4 is laid by hanging from the top plate when it is at a high place, and by using a pipe bracket when it is at a low place, and the hanging distance is not less than 3 meters. The steel pipes 4 of each route should be sprayed with different colors of fonts to distinguish and indicate the flow direction according to the functional differences such as water inlet, drainage, air intake, and exhaust, so as to facilitate later inspection and maintenance.

[0022] The sensors include flow sensors, gas sensors, temperature sensors, negative pressure sensors, temperature sensors and water level sensors.

[0023] The negative pressure compensator 7 and the positive pressure compensator 15 are drains, and the steel pipe 4 is installed obliquely with the two to prevent backflow.

[0024] The pipeline pressure of components such as steel pipe 4, valve, elbow 14 and flange 13 shall not be less than 1MPa.

[0025] The fire-blocking device 8 consists of two parts: an explosion-proof plate and a fire-extinguishing module. The explosion-proof plate responds to the rapid increase in the deflagration pressure and opens immediately to reduce the pressure. When the expanding fireball passes through the opened explosion-proof plate, it is blocked by the fire-extinguishing module. The stainless steel precision mesh supported by the frame plays a three-dimensional flame capture role, extinguishes the flame, and ensures that the flame is not spread, thereby causing secondary explosions or multiple explosions. The fire-extinguishing module eliminates the flame of the deflagration, reduces the temperature of the hot gas, and captures the burning and unburned dust passing through the opened explosion-proof plate. At the same time, the pressure wave or noise generated by the production equipment will also be reduced to a minimal level. When the flame passes through the mesh fire-blocking element, the fire-blocking element exchanges heat with the flame, quickly cools the high-temperature flame, releases pressure and smoke, and at the same time, the pressure wave or noise generated by the production equipment will also be reduced.

[0026] The anti-backfire device 9 adopts the FHQ series, which is mainly composed of a cone body, a fire-blocking core, an intermediate straight pipe, a flange, standard parts, etc., and uses the heat dissipation effect of the copper mesh to isolate the spread of flames.

[0027] The slag discharger 11 includes inlet and outlet pipelines, a variable head, a flange, a filter screen, a cross butterfly valve, a sealing ring, a sealing gasket, etc. It is used for automatic slag discharge of the main pipe, trunk pipe, and branch pipe of the gas extraction and utilization system. The graded screen baffles are used to block and precipitate coal slag, stones and other large debris in the pipeline to purify the air flow and protect the safety of the gas extraction equipment.

[0028] The utility model uses a water ring vacuum pump to extract underground gas upwards, and after separation treatment by various levels of equipment, the gas passes through the upper steel pipe for further treatment, and the residue passes through the lower steel pipe for subsequent treatment. During the process, the various sensors in the steel pipe detect the concentration and temperature in real time to prevent high-temperature spontaneous combustion. After passing through the compensator, the gas or residue is promptly injected with water for treatment, so as to collect pure gas or cool and clean the residual coal slag to prevent spontaneous combustion. The utility model has a simple structure and is easy to use.

[0029] The above description is only used to illustrate the technical solution of the utility model rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the utility model by ordinary technicians in this field should be included in the scope of the claims of the utility model as long as they do not depart from the spirit and scope of the technical solution of the utility model.

Claims

1. A gas extraction device for a mining area, characterized in that: It comprises a water ring vacuum pump, one side of which is sequentially connected with a reducer and a driving motor, the upper end of the water ring vacuum pump is also connected with a gas-water separator through a steel pipe, a butterfly valve switch is also arranged on the steel pipe, the upper end of the gas-water separator is sequentially connected with a negative pressure compensator, a fire arrester, an anti-backfire device, an anti-air return device and a slag discharger through a steel pipe, wherein a flow meter is also arranged in the middle of the pipeline, a flange is also installed at the lower end of the gas-water separator, an elbow, an anti-backfire device, a fire arrester, an anti-backfire device and a positive pressure compensator are sequentially connected to the flange, a butterfly valve switch is also arranged between the elbow and the anti-backfire device, and a sensor is also arranged in the above-mentioned device.

2. A mining area gas extraction device according to claim 1, characterized in that: The inner wall of the pipeline is provided with a drag-reducing and wear-resistant coating, and the outer surface is provided with a chlorinated rubber paint.

3. A mining area gas extraction device according to claim 1, characterized in that: The water ring vacuum pump and the fire-blocking device are horizontally arranged on the ground, and the other devices and steel pipes are installed and laid along the slope of the tunnel.

4. A mining area gas extraction device according to claim 1, characterized in that: The steel pipes are laid by hanging from the top plate when at a high place, and are laid using pipe supports at a low place, and the hanging interval is not less than 3 meters.

5. A mining area gas extraction device according to claim 1, characterized in that: The sensors include a flow sensor, a gas sensor, a temperature sensor, a negative pressure sensor, a temperature sensor and a water level sensor.

6. A mining area gas extraction device according to claim 1, characterized in that: The negative pressure compensator and the positive pressure compensator are water drains, and the steel pipes are installed obliquely with the two to prevent water backflow.

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