CN105381694B - A kind of coal mine methane and the blending processing system to draw out methane - Google Patents

Abstract

The invention provides a blending treatment system for coal mine exhaust air and exhaust gas, comprising: exhaust air induction hood (6), exhaust air conveying pipeline (7a), exhaust gas connecting pipeline (4), mixer (M ), a mixed gas delivery pipeline (7b), an induced draft fan (11) and a regenerative high-temperature oxidation device (12); The exhausted gas is sucked into the exhaust gas conveying pipeline (7a) through the drained gas connecting pipe (4), mixed evenly with the exhaust air in the exhaust air conveying pipeline (7a) through the mixer (M), and transported through the mixed gas The pipeline (7b) is transported to the regenerative high-temperature oxidation device (12) for oxidation treatment. The above-mentioned blending treatment system can safely collect, blend and transport exhaust air and drained gas in coal mines, provide a safe gas source for subsequent utilization projects such as regenerative high-temperature oxidation, and discharge completely oxidized products into the atmosphere .

Description

A blending treatment system for coal mine exhaust air and gas drainage

technical field

The invention relates to the fields of coal mine energy saving and emission reduction, coal mine safety technology and engineering, in particular to a coal mine ventilation and gas extraction mixing treatment system.

Background technique

During the production process of coal mines, a large amount of gas stored in coal seams will flow into the mining space. In order to ensure the safety and health of the air in the underground mines of coal mines, it is necessary to blow a large amount of fresh air into the underground mines. These airflows carry very low concentrations of methane (less than 0.75%) is discharged from the ground into the atmosphere through the return air outlet, commonly known as "air exhaust gas" or "air exhaustion".

Especially in some high-gas mines, because the gas concentration of the working face far exceeds the standard stipulated in the "Coal Mine Safety Regulations", it is difficult to control the gas concentration of the working face within the allowable range by simply using ventilation; Gas outbursts the mine, and the danger of the outburst also seriously threatens the life safety of the mine workers and restricts the normal production of the mine. In this case, gas drainage must be adopted to improve mine safety and ease production pressure.

In order to reduce and eliminate the threat of mine gas to coal mine safety production, the negative pressure caused by mechanical equipment and special pipelines is used to extract the gas stored or released in the coal (rock) layer and transport it to the ground or other safe places. It's called gas drainage.

According to statistics, the total amount of methane discharged into the atmosphere by coal mines in my country every year is more than 24 billion cubic meters. Methane gas has a strong greenhouse effect, equivalent to 25 times that of carbon dioxide. The explosion limit of methane in air is 5% to 16%. Coal mine gas is divided into high-concentration gas and low-concentration gas. High-concentration gas refers to gas with a gas concentration greater than 30%, and low-concentration gas refers to gas with a gas concentration lower than 30%. More than 60% of the gas in my country is low-concentration gas containing less than 30% methane. According to coal mine safety regulations, gas concentration below 30% cannot be stored in gas storage tanks, and most of them are directly discharged into the air. The direct emission of low-concentration drainage gas from coal mines has caused a huge waste of non-renewable resources on the one hand, and has also aggravated air pollution and the greenhouse effect on the other hand.

The exhaust gas and low-concentration drainage gas are collected and transported, and the methane originally discharged into the atmosphere is eliminated through the oxidation treatment of the gas, so that it is oxidized into carbon dioxide and water, thereby producing a huge greenhouse gas emission reduction effect. Therefore, how to safely and effectively collect and transport coal mine ventilation and low-concentration drainage gas is particularly important.

Contents of the invention

The purpose of the present invention is to provide a blending treatment system for coal mine exhaust and gas extraction in order to make full use of exhaust air and exhaust gas discharged from coal mines, and to avoid the technical problems of environmental pollution caused by gas discharge into the air. The system can safely collect, blend and transport exhaust air and exhausted gas in coal mines, provide a safe gas source for subsequent utilization projects such as regenerative high-temperature oxidation, and finally discharge the non-polluting carbon dioxide gas generated after complete oxidation to the atmospheric environment.

In order to achieve the above object, the present invention provides a coal mine exhaust air and gas extraction blending treatment system, the blending treatment system includes: exhaust air induction hood, exhaust air conveying pipeline, exhaust gas connection pipeline, mixer, Mixed gas delivery pipeline, induced draft fan and regenerative high-temperature oxidation device; the exhaust air delivery pipeline communicates with the exhaust air induction hood, so that the exhaust air is sucked into the exhaust air delivery pipeline due to negative pressure; the exhaust gas connection pipeline The exhaust port of the exhaust port is connected with the exhaust air conveying pipeline, so that the drained gas is sucked into the exhaust air conveying pipeline due to the negative pressure in the exhaust gas connecting pipeline, and mixed evenly with the exhaust air flowing in the exhaust air conveying pipeline through the mixer to have a low After the mixed gas with a high concentration of methane is transported to one or more regenerative high-temperature oxidation devices through the mixed gas delivery pipeline for oxidation treatment; the negative pressure transmission power of the coal mine ventilation and exhaust gas comes from the upstream of the regenerative high-temperature oxidation device An induced draft fan is provided, and when the induced draft fan operates, negative pressure is generated in the exhaust air conveying pipeline and the gas extraction connecting pipeline.

After the exhausted gas enters the exhaust air pipeline, the exhausted gas is rapidly diluted by the exhaust air and mixed uniformly until the methane concentration does not exceed the lower explosion limit, preferably less than 1.5%, so that the gas concentration is much lower than that of methane Safe transportation after explosion limit.

As a further improvement of the above technical solution, the blending treatment system also includes: a gas drainage pipe and a gas drainage hood; Connected; the gas extraction hood is a conductive cover structure, and the gas extraction hood is arranged at the outlet of the gas extraction pipe and communicated with the atmosphere; the gas extraction hood is connected to the atmosphere; The side wall of the air cover is provided with an air-introducing hole, and the air-introducing hole communicates with the air inlet of the gas extraction connecting pipe.

As a further improvement of the above technical solution, the gas extraction connecting pipe is provided with an explosion suppression device, and the explosion suppression device performs explosion monitoring through two sets of flame sensors installed on the gas extraction connecting pipe and the gas extraction hood. .

As a further improvement of the above technical solution, the exhaust air conveying pipeline is provided with an exhaust air source regulating valve on the side close to the exhaust port of the exhaust air hood, and the intersection point of the exhaust air conveying pipeline and the gas extraction connecting pipeline A pressure sensor is installed upstream or nearby. The pressure sensor monitors the gas pressure before mixing in the exhaust air conveying pipeline, and performs closed-loop automatic adjustment to the exhaust air source regulating valve, so that a constant negative pressure is generated in the gas drainage connection pipeline to realize Under the condition that the exhaust gas exhaust pipe is open to the atmosphere, most of the gas is extracted into the exhaust gas conveying pipeline by the negative pressure in the gas extraction connecting pipeline.

As a further improvement of the above technical solution, the mixed gas delivery pipeline is provided with a measuring instrument downstream of the mixer, and the measuring instrument performs closed-loop frequency conversion control on the induced draft fan through the displayed monitoring value to realize the gas flow rate in the mixed gas delivery pipeline control.

As a further improvement of the above technical solution, the mixed gas delivery pipeline is provided with a methane concentration monitor on the side close to the outlet of the mixer, through the continuous on-line monitoring of the methane concentration, the gas drainage provided on the gas drainage connection pipeline The regulating valve performs closed-loop automatic regulation to control the concentration of methane after blending to not exceed 1.5%.

As a further improvement of the above technical solution, at least one mixer is arranged downstream or near the junction of the exhaust gas conveying pipeline and the gas drainage connecting pipeline. The mixer is a deflector, and the deflector is arranged near the intersection of the exhaust air conveying pipeline and the gas drainage connecting pipeline.

Or the mixer is selected as a static blender, and the static blender is arranged downstream of the intersection of the exhaust air conveying pipeline and the exhaust gas connection pipeline, so that the exhaust air and the exhaust gas can be mixed once, Afterwards, a static blender is installed to ensure that the exhaust gas and drainage gas are evenly blended after blending, and stratification does not occur. The mixer can also be selected as a combination of at least one deflector and at least one static mixer, and the mixer is arranged downstream or near the intersection of the exhaust air conveying pipeline and the gas extraction connecting pipeline. In addition, as At least one component in the combination, such as any deflector or static mixer, can also be arranged upstream of the intersection of the exhaust air delivery pipeline and the gas drainage connection pipeline.

As a further improvement of the above technical solution, the gas extraction connecting pipe extends into the exhaust gas conveying pipeline, and a distance is left between the pipe wall of the exhaust gas conveying pipeline and the exhaust port of the exhaust gas connecting pipeline opposite to it.

As a further improvement of the above technical solution, the mixed gas delivery pipeline is provided with a mist removal and dehydration device downstream of the mixer, and several channels for air delivery are formed by corrugated plates arranged in parallel in the mist removal and dehydration device. It is used to send the gas after removing water droplets into the regenerative high temperature oxidation device. Improve thermal efficiency of regenerative high temperature oxidation device.

As a further improvement of the above technical solution, the mixed gas delivery pipeline is provided with an isolation valve on the side close to the inlet of the induced draft fan, and the isolation valve controls its switch through the monitoring results of the methane concentration monitor. The laser methane concentration monitoring The pipeline distance between the detector and the isolation valve is required to be greater than the distance conveyed by the gas in the pipeline through the 2-second response time of the methane concentration monitor and the closing time of the isolation valve within 2 seconds, so as to ensure that when the methane concentration monitor detects that the methane concentration exceeds After the preset threshold, preferably the threshold is set to exceed 40% of the lower explosion limit, the isolation valve is closed urgently, so that the regenerative high-temperature oxidation device is completely isolated from the mixed gas delivery pipeline, ensuring system safety.

As a further improvement of the above technical solution, the mixed gas delivery pipeline is provided with an emergency emptying pipe upstream of the isolation valve, the upper port of the emergency emptying pipe is directly connected to the atmosphere, and the emergency emptying pipe is provided with an exhaust pipe. Empty valve and exhaust fan; when the regenerative high-temperature oxidation device is out of operation, the exhaust valve is opened and the exhaust fan is started through closed-loop control, and the negative pressure generated by the exhaust fan is used to extract the exhaust air from the exhaust air hood for blowing After the mixed gas is delivered to the pipeline, the residual gas in the pipeline is discharged into the atmosphere through the emergency exhaust pipe to ensure the safety of the system. The "outage of regenerative high-temperature oxidation device" mentioned in the whole text of the present invention means that each regenerative high-temperature oxidation device is isolated from the mixed gas delivery pipeline or multiple mixed gas delivery pipelines, or the regenerative high-temperature oxidation occurs. A condition or state in which a device is shut down.

As a further improvement of the above technical solution, an air inlet pipe is provided upstream of the intersection point of the exhaust gas conveying pipe and the gas drainage connecting pipe, and the air inlet of the air inlet pipe is directly connected to the atmosphere. A pressure regulating valve is provided. When the regenerative high-temperature oxidation device is out of operation, the closed-loop control pressure regulating valve is opened to use the atmosphere to balance the negative pressure in the ventilation pipeline and the gas extraction pipeline.

As a further improvement of the above technical solution, the mixed gas delivery pipeline is provided with an exhaust intake pipe upstream of the isolation valve, and the air inlet of the exhaust intake pipe is directly connected to the atmosphere. Evacuation fan and air intake valve; the exhaust air conveying pipeline is provided with an emergency emptying pipe, and the emergency emptying pipe is arranged upstream of the intersection of the exhaust air conveying pipeline and the gas extraction connecting pipe, and the emergency emptying There is an exhaust valve on the pipe; when the regenerative high-temperature oxidation device is out of operation, the exhaust valve, the intake valve and the exhaust fan are controlled by closed-loop control, and the exhaust fan is used to extract air from the atmosphere to purge the mixed gas After the transmission pipeline and exhaust air transmission pipeline, the residual gas in the pipeline is discharged into the atmosphere through the emergency exhaust pipe.

As a further improvement of the above technical solution, a ventilation pipe is provided upstream of the intersection of the exhaust gas conveying pipeline and the gas drainage connection pipeline, the upper port of the ventilation pipe is directly connected to the atmosphere, and the ventilation pipe is provided with a multifunctional Valve; the mixed gas delivery pipeline is provided with a multi-channel mixed gas delivery pipeline, and several regenerative high-temperature oxidation devices are connected in parallel on the multi-channel mixed gas delivery pipeline, and the end of the multi-channel mixed gas delivery pipeline is provided with There is an exhaust intake pipe, one end of the exhaust intake pipe is directly connected to the atmosphere, and the exhaust air intake pipe is provided with an exhaust fan and an intake valve; The multi-function valve, the intake valve are opened, and the exhaust fan is started. The exhaust fan is used to extract air from the atmosphere to purge the multi-channel mixed gas delivery pipeline, the mixed gas delivery pipeline and the exhaust air delivery pipeline in sequence, and remove the residual gas in the pipeline. The gas is discharged into the atmosphere through the ventilation pipe; or when the regenerative high-temperature oxidation device is out of operation, the opening of the intake valve and the start-up of the exhaust fan are controlled through closed-loop, and the exhaust fan is used to extract the exhaust gas from the exhaust fan hood by using the negative pressure generated by the exhaust fan. After the mixed gas delivery pipeline is blown by the wind, the residual gas in the pipeline is discharged into the atmosphere through the exhaust intake pipe; or when the regenerative high-temperature oxidation device is out of operation, the intake valve and the multi-function valve are opened and emptied through closed-loop control When the fan is started, air is drawn from the ventilation pipe to blow off the exhaust air conveying pipe and the mixed gas conveying pipe, and then the residual gas in the pipe is discharged into the atmosphere through the air intake pipe. The gas can be discharged backward through the exhaust fan at the end of the mixed gas delivery pipeline to avoid gas backflow.

As a further improvement of the above technical solution, when the regenerative high-temperature oxidation device is out of operation, the closed-loop control multi-function valve is opened to use the atmosphere to balance the pressure in the ventilation pipeline and the gas drainage pipeline.

As a further improvement of the above technical solution, the blending treatment system also includes a chimney, and the chimney communicates with the regenerative high-temperature oxidation device through the provided cleaning gas delivery pipeline, and is used to oxidize the regenerative high-temperature oxidation device The clean gas produced by the treatment is discharged into the atmosphere; the clean gas delivery pipeline is provided with a clean gas valve for controlling the opening and closing of the clean gas delivery pipeline.

As a further improvement of the above technical solution, the blending treatment system also includes a steam boiler, and both the steam boiler and the chimney communicate with the regenerative high-temperature oxidation device through the provided hot air pipeline, and the steam boiler is used for absorbing The high-temperature hot air generated by the regenerative high-temperature oxidation device is utilized for heat energy; the hot air conveying pipe is provided with a hot air valve and a hot air bypass valve, and the hot air valve is used to control the on-off of the hot air conveying pipe and the steam boiler. The hot air bypass valve is used to control the on-off of the hot air conveying pipe and the chimney.

As a further improvement of the above technical solution, a pressure equalizing ring is provided inside the induced draft fan, and the pressure equalizing ring is used to measure the gas flow in the mixed gas delivery pipeline.

The advantages of the blending treatment system for coal mine exhaust air and exhaust gas of the present invention are:

1. The blending treatment system of the present invention can safely collect, blend and transport the exhaust gas and drained gas in coal mines, and provide a safe gas source for subsequent utilization projects such as regenerative high-temperature oxidation and fuel combustion, and will eventually completely The non-polluting carbon dioxide gas generated after oxidation is discharged into the atmosphere, which plays a role in energy saving and emission reduction;

2. Design the exhaust air hood and exhaust gas exhaust hood to permanently evacuate the atmosphere. When the exhaust air and exhaust gas are kept in a natural emptying state, once the induced draft fan at the entrance of the regenerative high temperature oxidation device stops, The negative pressure in the exhaust air flue disappears, and the exhaust air and exhaust gas will be emptied along the original direction, which has no effect on the normal operation of the coal mine ventilation system and extraction system, ensuring the safety of coal mine production;

3. The gas drainage in the prior art needs to rely on the positive pressure output by the water ring pump to transport the drained gas to the mixing point, thus increasing the running resistance and burden of the water ring pump. Negative pressure is formed in the pipeline to actively collect and drain the gas, completely getting rid of the dependence on the positive pressure delivery of the gas water ring pump in the ground drainage pump station of the coal mine, and can reduce the running resistance of the water ring pump when collecting gas, without any impact on the normal operation of the pump station ;

4. Use the monitoring results of pressure sensors and laser methane concentration monitors to perform closed-loop control on the valves of each pipeline, thereby realizing automatic control of gas flow, gas concentration and negative pressure, and ensuring that the gas concentration after mixing is lower than the lower explosion limit , preferably less than 1.5%, to provide a safe gas source for subsequent utilization projects such as high-temperature oxidation of heat storage devices and fuel combustion.

Description of drawings

Fig. 1 is a schematic structural diagram of a coal mine ventilation and gas drainage blending treatment system in Embodiment 1 of the present invention.

Fig. 2 is a schematic structural diagram of a coal mine ventilation and gas drainage blending treatment system in Embodiment 2 of the present invention.

Fig. 3 is a schematic structural diagram of a coal mine ventilation and gas drainage blending treatment system in Embodiment 3 of the present invention.

Fig. 4 is a schematic structural diagram of a coal mine ventilation and gas drainage blending treatment system in Embodiment 4 of the present invention.

Fig. 5 is a schematic structural diagram of a coal mine exhaust air and gas drainage mixing treatment system in Embodiment 5 of the present invention.

Fig. 6 is a schematic structural diagram of a blending treatment system for exhaust air and gas drainage in a coal mine according to Embodiment 6 of the present invention.

Fig. 7 is a schematic structural diagram of a pressure equalizing ring disposed in an induced draft fan in Embodiment 6 of the present invention.

Fig. 8 is a schematic structural diagram of a coal mine ventilation and gas drainage blending treatment system in Embodiment 7 of the present invention.

Fig. 9 is a schematic structural diagram of a coal mine ventilation and gas drainage blending treatment system in Embodiment 8 of the present invention.

Fig. 10 is a diagram showing the connection relationship between the special-shaped gas drainage connection pipe and the exhaust air conveying pipe shown in the eighth embodiment of the present invention.

Fig. 11 is a schematic structural diagram of the first special-shaped gas drainage connection pipeline in the present invention.

Fig. 12 is a schematic structural diagram of the second special-shaped gas drainage connection pipeline in the present invention.

Fig. 13 is a schematic structural diagram of the third special-shaped gas drainage connection pipeline in the present invention.

Fig. 14a is a schematic diagram of the structure of the fourth special-shaped gas drainage connection pipeline in the present invention.

Fig. 14b is a radial cross-sectional view of the fourth special-shaped gas drainage connection pipe shown in Fig. 14a.

Fig. 15a is a schematic diagram of the structure of the fifth special-shaped gas drainage connection pipeline in the present invention.

Fig. 15b is a radial cross-sectional view of the fifth special-shaped gas drainage connection pipe shown in Fig. 15a.

reference sign

1. Coal mine surface drainage pumping station 2. Gas drainage pipe

3. Gas extraction hood 4. Connection pipe for gas extraction

5. Exhaust air diffusion tower 6. Exhaust air induction hood

7a. Exhaust air delivery pipeline 7b. Mixed gas delivery pipeline

M. Mixer 8. Baffle

9. Static blender 10. Demister and dehydration device

11. Induced fan 12. Regenerative high temperature oxidation device

13. Explosion suppression device 14. Flame sensor

15. Regulating valve for draining gas 16. Regulating valve for exhaust air source

17. Pressure sensor 18. Measuring instrument

19. Methane concentration monitor 20. Isolation valve

21. Evacuation valve 22. Evacuation fan

23. Emergency evacuation pipe 23b, Evacuation intake pipe

24. Intake valve 25. Multi-channel mixed gas delivery pipeline

26. Clean gas pipeline 27. Chimney

28. Cleaning gas valve 29. Hot air valve

30. Hot air pipeline 31. Steam boiler

32. Hot air boiler bypass valve 33. Temperature sensor

34. Pressure regulating valve 35. Air intake pipe

36. Pressure equalizing ring 37. Ventilation pipe

38. Multifunctional valve 39. Steam turbine

40. Generator 41. Cooling equipment

42. Feed water pump 4*, special-shaped gas drainage connection pipe

8*, special-shaped deflector

detailed description

A coal mine ventilation and gas extraction blending treatment system according to the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

Embodiment one

As shown in Figure 1, it is a blending treatment system for coal mine exhaust air and low-concentration gas drainage of the present invention. Connect the pipeline 4, the mixer M, the mixed gas delivery pipeline 7b, the induced draft fan 11 and the regenerative high temperature oxidation device 12; In the exhaust gas conveying pipeline 7a; the exhaust port of the exhaust gas connecting pipeline 4 communicates with the exhaust air conveying pipeline 7a, so that the exhausted gas is input from the exhaust gas connecting pipeline 4 to the exhaust air conveying pipeline 7a, and the exhaust gas is conveyed After the exhaust air flowing in the pipeline 7a is mixed uniformly by the mixer M until the methane volume concentration is lower than 1.5% (preferably 1.2%), it is transported to one or more regenerative high-temperature oxidation devices 12 through the mixed gas delivery pipeline 7b for oxidation deal with. The transmission power of the gas extraction and exhaust air comes from the induced draft fan 11 provided upstream of the regenerative high-temperature oxidation device 12. Negative pressure is generated in the delivery pipe 7a. The air inlet of the mixed gas delivery pipeline 7b is connected to the exhaust air delivery pipeline 7a, and at least one induced draft fan 11 is arranged in the pipeline.

After the low-concentration drained gas enters the exhaust air conveying pipeline 7a, the low-concentration exhausted gas is rapidly diluted by the exhaust air and mixed evenly, so that the methane concentration is lower than the preset value, far below the methane explosion limit . The mixer M is specially designed through professional flow field numerical simulation.

The blending treatment system based on the above structure, as shown in Figure 1, in this embodiment, the blending treatment system can also include: a coal mine drainage gas exhaust pipe 2 and a gas extraction hood 3; The gas discharge pipe 2 is a cylinder structure that conducts up and down, and its lower port communicates with the coal mine surface extraction pump station 1; the gas extraction hood 3 is a cover structure that conducts up and down. The upper port of the air-inducing hood 3 is directly connected to the atmosphere, and the lower port is in communication with the upper port of the exhaust gas exhaust pipe 2. The side wall of the air-inducing air hood 3 for extracting gas is provided with an air-inducing hole. The air hole communicates with the air inlet of the gas extraction connecting pipe 4 .

The gas extraction connecting pipeline 4 is provided with an explosion suppression device 13, and the explosion suppression device 13 monitors the explosion through two sets of flame sensors 14 installed on the gas extraction connecting pipeline 4 and the gas extraction hood 3. One set of flame sensors can be installed within a range of less than 5 meters from the upper port of the gas extraction hood 3; the other set of flame sensors can be installed within a range of less than 2 meters from the exhaust air conveying pipeline 7a, and the distance from the explosion suppression device is not greater than Within a range of 20 meters; once the flame sensor detects an explosion ahead, the explosion suppression device will immediately activate to suppress the explosion and block the explosion propagation. The total response time of the system is <12ms. The explosion suppression device 13 can adopt a carbon dioxide active explosion suppression device.

Described mixer M can be designed as static blender 9, also can be designed as deflector 8; And in the present embodiment, mixer M is the combination of static blender 9 and deflector 8, described The deflector 8 is set near the intersection of the exhaust gas conveying pipeline 7a and the gas extraction connecting pipeline 4 . The static blender 9 is arranged downstream of the intersection of the exhaust gas delivery pipeline 7a and the gas drainage connection pipeline 4 . The mixed gas delivery pipeline 7b is provided with a defogging and dehydrating device 10 downstream of the static blender 9, and in the described defogging and dehydrating device 10, several passages for airflow delivery are formed by corrugated plates arranged in parallel, so that the airflow After contacting with the plate surface, the heavier liquid droplets in the gas are hit on the plate surface, and then condensed into large water droplets, which can flow out of the pipe along the corrugated plate from the discharge pipe, and the dry gas after removing the water droplets is sent to the storage tank. In the thermal high temperature oxidation device 12, the heat efficiency of the regenerative high temperature oxidation device 12 is improved. Since the demisting and dehydrating device 10 only performs dehydration through corrugated plates, the use of conductive materials avoids ignition sources caused by electrostatic charging.

The working principle of gas treatment by using the above-mentioned blending treatment system of coal mine exhaust air and gas drainage is as follows:

First of all, the drained gas from the surface drainage pump station 1 of the coal mine is transported into the drained gas exhaust pipe 2 due to the positive pressure at the outlet of the gas water ring pump, and then enters the drained gas hood 3 . When the regenerative high-temperature oxidation device 12 is out of operation, the exhaust gas conveying pipeline 7a and the exhaust gas connecting pipeline 4 are under positive pressure, the gas collection rate is 0%, and the gas in the connecting section with the exhaust gas exhaust pipe 2 is due to The action of the jet flow can reversely flow into the gas extraction hood 3, effectively preventing the gas from leaking into the exhaust air conveying pipeline 7a, and the exhausted gas is discharged into the atmosphere through the upper port (diffusion port) of the gas extraction hood 3, Simultaneously, the exhaust air in the exhaust air diffusion tower 5 can be discharged into the atmosphere through the exhaust air induction hood 6 provided at its upper end; Driven by the blower fan 11, the exhaust air in the exhaust air diffusion tower 5 is sucked into the exhaust air conveying pipe 7a through the negative pressure of the induced draft fan 11, and the strong negative pressure existing in the exhaust air conveying pipe 7a makes the gas induced draft hood 3 cover Negative pressure is generated at the air induction hole on the side wall to attract the drained gas into the drained gas connecting pipe 4, and the drained gas that further enters the exhaust air conveying pipeline 7a is mixed with the exhaust air and diluted to a methane concentration below 1.5%. The deflector 8 and the static mixer 9 are mixed evenly twice, and the liquid droplets are removed by the demisting and dehydrating device 10, and then transported to the regenerative high-temperature oxidation device 12 for oxidation treatment, and the final products of carbon dioxide and water are discharged to the atmosphere middle.

In addition, as shown in Figure 1, the exhaust air delivery pipeline 7a is provided with an exhaust air source regulating valve 16 on the side close to the exhaust outlet of the exhaust air induction hood 6, and the exhaust air delivery pipeline 7a is connected with the exhaust gas A pressure sensor 17 is installed upstream or near the intersection point of the pipeline 4. The pressure sensor 17 performs closed-loop automatic adjustment on the exhaust air source regulating valve 16 by monitoring the gas pressure in the exhaust air conveying pipeline 7a before mixing, so that the exhaust gas A constant negative pressure is generated in the connecting pipeline 4 to realize that most of the gas is extracted into the gas drainage connecting pipeline 4 under the condition that the gas drainage pipe 2 is open to the atmosphere.

Described mixed gas delivery pipeline 7b is provided with measuring instrument 18 in the downstream of static blender 9, and described measuring instrument 18 can adopt flowmeter or pressure sensor, and this measuring instrument 18 is mixed by monitoring mixed gas delivery pipeline 7b The final gas pressure is controlled by closed-loop frequency conversion on the induced draft fan 11 to realize the control of the gas flow in the exhaust air conveying pipeline.

The mixed gas delivery pipeline 7b is provided with a methane concentration monitor 19 downstream of the static blender 9, through the continuous on-line monitoring of the methane concentration, the gas drainage regulating valve 15 provided on the gas drainage connecting pipeline 4 is closed-looped. Automatic adjustment to realize the control of gas concentration after blending, which can ensure that the concentration of exhaust air after blending does not exceed 1.5%.

The methane concentration monitor 19 can respond quickly, and is preferably an infrared methane monitor.

The deflector 8 can be arranged near the junction of the exhaust gas conveying pipeline 7a and the gas drainage connecting pipeline 4 to realize pre-mixing. Thereafter, a static blender 9 is set at a certain distance to ensure that the exhaust air and the low-concentration drainage gas are evenly mixed without stratification.

The mixed gas delivery pipeline 7 b is provided with an isolation valve 20 on the side close to the inlet of the induced draft fan 11 , and the isolation valve 20 is controlled on and off by the monitoring result of the methane concentration monitor 19 .

The pipeline distance between the methane concentration monitor 19 and the isolation valve 20 is required to be greater than the distance of gas delivery, and the delivery distance meets the requirements: the gas in the pipeline passes through the 2-second response time of the methane concentration monitor and the isolation valve within 2 seconds. The distance conveyed by the closing time; to ensure that when the methane concentration monitor 19 detects that the methane concentration exceeds 1.8%, the isolation valve 20 provided at the entrance of the regenerative high temperature oxidation device can be closed urgently to ensure system safety.

The mixed gas delivery pipeline 7 b is provided with an emergency emptying pipe 23 upstream of the isolation valve 20 . The upper port of the emergency emptying pipe 23 is directly connected to the atmosphere, and the emergency emptying pipe 23 is provided with an emptying valve 21 and an emptying fan 22 . When the regenerative high-temperature oxidation device 12 is out of operation, the exhaust valve 21 is opened and the exhaust fan 22 is started through closed-loop control, and the exhaust fan 22 is used to extract the exhaust air from the exhaust fan hood 6 to blow the exhaust air. After the conveying channel 7, the residual gas in the exhaust air conveying pipeline 7 is discharged into the atmosphere through the emergency emptying pipe 23, effectively avoiding the potential safety hazard caused by the residual gas in the exhaust air conveying pipeline 7, and ensuring the safety of the system.

Embodiment two

As shown in Figure 2, it is a blending treatment system for coal mine exhaust air and low-concentration gas drainage of the present invention. Connect the pipeline 4, the mixer, the mixed gas delivery pipeline 7b, the induced draft fan 11 and the regenerative high temperature oxidation device 12. The difference from Embodiment 1 is that it also includes a chimney 27 and a steam boiler 31, and the chimney 27 communicates with the regenerative high-temperature oxidation device 12 through the provided clean gas delivery pipeline 26 for converting the regenerative high-temperature oxidation The clean gas produced by the oxidation treatment of the device 12 is discharged into the atmosphere; the clean gas delivery pipeline 26 is provided with a clean gas valve 28 for controlling the opening and closing of the clean gas delivery pipeline 26 . Both the steam boiler 31 and the chimney 27 communicate with the regenerative high-temperature oxidation device 12 through the provided hot air delivery pipe 30, and the steam boiler 31 is used to absorb the high-temperature hot air generated by the regenerative high-temperature oxidation device 12 for thermal energy utilization; The hot blast delivery pipeline 30 is provided with a hot blast valve 29 and a hot blast bypass valve 32, the hot blast valve 29 is used to control the on-off of the hot blast delivery pipeline 30 and the steam boiler 31, and the hot blast bypass valve 32 is used for Control the on-off of the hot air conveying pipe 30 and the chimney 27.

The excess heat energy generated by conversion of methane into the regenerative high temperature oxidation device 12 is sent to the steam boiler 31 in the form of hot air exceeding 800 degrees Celsius. The release of the energy is usually monitored by a temperature sensor 33 installed in the combustion chamber of the regenerative high temperature oxidation device 12 , a hot blast valve 29 and a hot blast bypass valve 32 . At this time, if the steam boiler 31 is not connected to the system, or the steam boiler 31 is not started, the hot blast will be bypassed and directly input to the clean gas delivery pipeline 26 through the hot blast bypass valve 32 .

In addition, in this embodiment, the mixer is designed as a static mixer 9 , and the static mixer 9 is arranged downstream of the intersection of the exhaust air delivery pipeline 7 a and the gas drainage connection pipeline 4 . And the exhaust air source regulating valve 16 and the pressure sensor 17 matched therewith are not provided.

Embodiment three

As shown in Figure 3, it is a blending treatment system for coal mine exhaust air and low-concentration gas drainage of the present invention. Connect the pipeline 4, the mixer, the mixed gas delivery pipeline 7b, the induced draft fan 11 and the regenerative high temperature oxidation device. The difference from Embodiment 1 is that this embodiment includes multiple regenerative high-temperature oxidation devices (12a, 12b...12x shown in the figure), and the mixed gas delivery pipeline 7b is provided with multiple mixed gas Conveying pipeline 25, described multi-channel mixed gas conveying pipeline 25 communicates with several regenerative high-temperature oxidation devices in parallel, and isolating valves (20a shown in the figure, 20b...20x) and induced draft fans (11a, 11b...11x shown in the figure). All regenerative high temperature oxidizers are controlled by corresponding isolation valves to keep them running simultaneously or to keep one or more units closed.

Each regenerative high-temperature oxidation device discharges the clean gas it produces into the atmosphere through the provided clean gas delivery pipeline (26a, 26b...26x shown in the figure), and discharges the clean gas it produces into the atmosphere through the provided hot blast delivery pipeline (shown in the figure). The shown 30a, 30b...30x) output the generated high-temperature hot air for thermal energy utilization.

Embodiment four

As shown in Figure 4, it is a blending treatment system for coal mine exhaust air and low-concentration gas drainage of the present invention. Connect the pipeline 4, the mixer, the mixed gas delivery pipeline 7b, the induced draft fan 11 and the regenerative high temperature oxidation device 12. The difference from the first embodiment is that: a chimney 27 is also included. The chimney 27 communicates with the regenerative high-temperature oxidation device 12 through the provided clean gas delivery pipeline 26, and is used to discharge the clean gas generated by the oxidation treatment of the regenerative high-temperature oxidation device 12 into the atmosphere; the clean gas delivery The pipeline 26 is provided with a cleaning gas valve 28 for controlling the opening and closing of the cleaning gas delivery pipeline 26 .

In addition, the mixed gas delivery pipeline 7b is provided with an exhaust intake pipe 23b upstream of the isolation valve 20, and the air inlet of the exhaust intake pipe 23b is directly connected with the atmosphere. Air blower 22a and air intake valve 24; the exhaust air conveying pipeline 7a is provided with an emergency emptying pipe 23a, and the emergency exhaust pipe 23a is arranged at the intersection of the exhaust air conveying pipeline 7a and the gas extraction connecting pipeline 4 Upstream, the emergency emptying pipe 23a is provided with an emptying valve 21a; when the regenerative high-temperature oxidation device 12 is out of service, the opening of the emptying valve 21a, the intake valve 24, and the start of the emptying fan 22a are controlled by closed-loop control, and the use of The exhaust fan 22a extracts air from the atmosphere, and after purging the mixed gas delivery pipeline 7b and exhaust air delivery pipeline 7a in the direction A opposite to the normal flow direction B, the residual gas in the pipeline is discharged into the atmosphere through the emergency exhaust pipe 23a, To ensure the security of the entire system.

Embodiment five

As shown in Figure 5, it is a blending treatment system for coal mine exhaust air and low-concentration gas drainage of the present invention. Connect the pipeline 4, the mixer, the mixed gas delivery pipeline 7b, the induced draft fan 11 and the regenerative high temperature oxidation device 12. The difference from the first embodiment is that: a chimney 27 is also included. The chimney 27 communicates with the regenerative high-temperature oxidation device 12 through the provided clean gas delivery pipeline 26, and is used to discharge the clean gas generated by the oxidation treatment of the regenerative high-temperature oxidation device 12 into the atmosphere; the clean gas delivery The pipeline 26 is provided with a cleaning gas valve 28 for controlling the opening and closing of the cleaning gas delivery pipeline 26 .

In addition, an air inlet pipe 35 is provided upstream of the intersection point of the exhaust air conveying pipe 7a and the gas drainage connecting pipe 4, the air inlet of the air inlet pipe 35 is directly connected to the atmosphere, and the air inlet pipe 35 is provided with There is a pressure regulating valve 34. When the regenerative high-temperature oxidation device 12 is out of operation, the pressure regulating valve 34 is opened through closed-loop control, and the negative pressure in the exhaust air transportation pipeline 7a and the exhaust gas connection pipeline 4 is used to balance the negative pressure in the air, so that the exhaust air There is a positive pressure inside the delivery pipeline 7a and the gas drainage connection pipeline 4 . At this time, even though the draining gas regulating valve 15 is not closed, due to the action of the jet, the drained gas can still flow back into the draining gas hood 3 in the direction B, effectively preventing the gas from leaking into the exhaust gas conveying pipeline 7a, thereby Increased overall system security.

Embodiment six

As shown in Figure 6, it is a blending treatment system for coal mine exhaust air and low-concentration gas drainage of the present invention. Connect the pipeline 4, the mixer, the mixed gas delivery pipeline 7b, the induced draft fan 11 and the regenerative high temperature oxidation device. The difference from the first embodiment is that: the induced draft fan 11 is provided with a pressure equalizing ring 36, and the pressure equalizing ring 36 is used to measure the gas flow. As shown in Figure 7, the flow rate can be calculated by measuring the pressure drop at the conical inlet of the induced draft fan 11, and by performing closed-loop frequency conversion control on the induced draft fan 11, the gas flow control in the exhaust air conveying pipeline can be realized.

Embodiment seven

As shown in Figure 8, it is a blending treatment system for coal mine exhaust air and low-concentration gas drainage of the present invention. Connect the pipeline 4, the mixer, the mixed gas delivery pipeline 7b, the induced draft fan 11 and the regenerative high temperature oxidation device. The difference from Embodiment 1 is that this embodiment includes multiple regenerative high-temperature oxidation devices (12a, 12b...12x shown in the figure), and the mixed gas delivery pipeline 7b is provided with multiple mixed gas Conveying pipeline 25, described multi-channel mixed gas conveying pipeline 25 communicates with several regenerative high-temperature oxidation devices in parallel, and isolating valves (20a shown in the figure, 20b...20x) and induced draft fans (11a, 11b...11x shown in the figure). All regenerative high temperature oxidizers are controlled by corresponding isolation valves to keep them running simultaneously or to keep one or more units closed.

Each regenerative high-temperature oxidation device delivers the clean gas it produces to the chimney 27 through the provided clean gas delivery pipeline (26a, 26b...26x shown in the figure), and then discharges it into the atmosphere, and passes through the provided hot air After the conveying pipes (30a, 30b...30x shown in the figure) transport the high-temperature hot air generated by it to the hot-air boiler 31, the steam boiler 31 is used to absorb the high-temperature hot air generated by the regenerative high-temperature oxidation device for thermal energy utilization;

Each cleaning gas delivery pipeline (26a, 26b...26x) is provided with a cleaning gas valve (28a, 28b...28x shown in the figure), which is used to control the opening and closing of the corresponding cleaning gas delivery pipeline. Each hot blast delivery pipeline (30a, 30b...30x) is provided with a hot blast valve (29a, 29b...29x shown in the figure) and a hot blast bypass valve (32a, 32b...32x shown in the figure), the described The hot blast valve is used to control the on-off of the corresponding hot-blast delivery pipeline and the steam boiler 31 , and the hot-blast bypass valve is used to control the on-off of the corresponding hot-blast delivery pipeline. Temperature sensors (33a, 33b...33x shown in the figure) are installed in the combustion chamber of each regenerative high-temperature oxidation device to monitor the temperature of the energy released by it.

In addition, a ventilation pipe 37 is provided upstream of the intersection point of the exhaust gas delivery pipeline 7a and the gas drainage connection pipeline 4, and the upper port of the ventilation pipe 37 is directly connected to the atmosphere, and the ventilation pipe 37 is provided with a multi-function valve. 38: The mixed gas delivery pipeline 7b is provided with a multi-channel mixed gas delivery pipeline 25, and the multi-channel mixed gas delivery pipeline 25 is connected in parallel with several regenerative high-temperature oxidation devices 12, and the multi-channel mixed gas delivery The end of the pipeline 25 is provided with an evacuation air intake pipe 23b, and one end of the evacuation air intake pipe 23b is directly communicated with the atmosphere, and the evacuation air intake pipe 23b is provided with an exhaust fan 22a and an air intake valve 24;

When the regenerative high-temperature oxidation device 12 is out of operation, through the closed-loop control of the multi-function valve 38, the opening of the intake valve 24 and the start-up of the exhaust fan 22a, the exhaust fan 22a is used to extract air from the atmosphere to purge the multi-channel mixed gas in sequence After the delivery pipeline 25, the mixed gas delivery pipeline 7b and the exhaust air delivery pipeline 7a, the residual gas in the pipeline is discharged into the atmosphere through the ventilation pipe 37;

Or when the regenerative high-temperature oxidation device 12 is out of operation, the multi-function valve 38 is opened to use the atmosphere to balance the pressure in the exhaust air delivery pipeline 7a and the gas extraction connecting pipeline 4 . At this time, even though the draining gas regulating valve 15 is not closed, due to the action of the jet, the drained gas can still flow back into the draining gas hood 3 in the direction B, effectively preventing the gas from leaking into the exhaust gas conveying pipeline 7a, thereby Increased overall system security.

Embodiment Eight

As shown in Figure 9, it is a blending treatment system for coal mine exhaust air and low-concentration gas drainage of the present invention. Connect the pipeline, the mixer, the mixed gas delivery pipeline 7b, the induced draft fan 11 and the regenerative high temperature oxidation device 12. The difference from Embodiment 1 is that it also includes a chimney 27 and a steam boiler 31, and the chimney 27 communicates with the regenerative high-temperature oxidation device 12 through the provided clean gas delivery pipeline 26 for converting the regenerative high-temperature oxidation The clean gas produced by the oxidation treatment of the device 12 is discharged into the atmosphere; the clean gas delivery pipeline 26 is provided with a clean gas valve 28 for controlling the opening and closing of the clean gas delivery pipeline 26 . Both the steam boiler 31 and the chimney 27 communicate with the regenerative high-temperature oxidation device 12 through the provided hot air delivery pipe 30, and the steam boiler 31 is used to absorb the high-temperature hot air generated by the regenerative high-temperature oxidation device 12 for thermal energy utilization; The hot blast delivery pipeline 30 is provided with a hot blast valve 29 and a hot blast bypass valve 32, the hot blast valve 29 is used to control the on-off of the hot blast delivery pipeline 30 and the steam boiler 31, and the hot blast bypass valve 32 is used for Control the on-off of the hot air conveying pipe 30 and the chimney 27.

The excess heat energy generated by the conversion of methane into the regenerative high-temperature oxidation device 12 is sent to the steam boiler 31 in the form of hot air over 800 degrees Celsius for heat exchange to generate superheated steam, which drives the turbine 39 to rotate and drives the generator 40 to produce Electric energy is generated, and the exhaust steam of the steam turbine enters the cooling device 41 to be condensed into condensed water, which is transported back to the steam boiler 31 by the feed water pump 42 for recycling.

In addition, in this embodiment, the mixer is designed as a combination of a static mixer 9 and a special-shaped deflector 8*, and the static mixer 9 is arranged on the exhaust gas conveying pipeline 7a and the gas extraction connection Downstream of the intersection of the pipelines, the gas drainage connection pipeline is a special-shaped gas drainage connection pipeline 4*. As shown in Figure 10, the special-shaped gas drainage connecting pipe 4* extends into the exhaust air conveying pipe 7a, and the pipe wall of the exhaust air conveying pipe 7a and the exhaust port of the exhaust gas connecting pipe 4 opposite to it respectively leave a distance, the special-shaped deflector 8* is fixed on one end of the special-shaped gas drainage connecting pipe 4*.

As shown in Figure 11, the special-shaped gas drainage connecting pipe 4* can be designed as a cuboid structure, and the special-shaped deflector 8* can be designed as an integrated structure with the special-shaped gas drainage connecting pipe 4*, and the special-shaped The deflector 8* extends from one side of the special-shaped gas drainage connecting pipe 4* to the exhaust outlet; Exhaust ports extend from both sides of the

As shown in Figures 14a and 14b, the special-shaped gas drainage connecting pipe 4* can be designed as a cylindrical structure, and the special-shaped deflector 8* can be fixed tangentially along the outer wall of the special-shaped gas drainage connecting pipe 4* At its exhaust port; as shown in Figures 15a and 15b, the special-shaped deflector 8* can also be designed as an integrated structure with the special-shaped gas drainage connection pipe 4*, and the special-shaped deflector 8* can be transformed from the special-shaped An arc surface of the gas extraction connecting pipe 4* extends out of the exhaust port.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than limit them. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications or equivalent replacements to the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention, and all of them should be included in the scope of the present invention. within the scope of the claims.

Claims (16)

1. a kind of coal mine methane and the blending processing system to draw out methane, it is characterised in that the blending processing system includes：Idle air Blower cover (6), idle air conveyance conduit (7a), the connecting pipe that draws out methane (4), blender (M), mixed gas delivery pipeline (7b), air-introduced machine (11) and heat-accumulating type high-temperature oxidation unit (12)；The idle air conveyance conduit (7a) connects with idle air blower cover (6) It is logical so that idle air is due in negative pressure absorbing to idle air conveyance conduit (7a)；The exhaust outlet of the connecting pipe that draws out methane (4) with Idle air conveyance conduit (7a) connects so that draws out methane because the connecting pipe that draws out methane (4) interior negative pressure is sucked into idle air conveying Pipeline (7a), the blended device of idle air (M) blending with flowing in idle air conveyance conduit (7a) uniformly extremely have low-concentration methane After mixed gas, one or more heat-accumulating type high-temperature oxidation unit (12) is delivered to by mixed gas delivery pipeline (7b) and carried out Oxidation processes；The coal mine methane and the negative pressure transportation power resources that draw out methane are in heat-accumulating type high-temperature oxidation unit (12) upstream The air-introduced machine (11) of setting；Described blender (M) is the combination of deflector (8) and static mixing machine (9), described deflector (8) it is arranged near the intersection of idle air conveyance conduit (7a) and the connecting pipe that draws out methane (4)；Described static mixing machine (9) it is arranged at the downstream of the intersection of idle air conveyance conduit (7a) and the connecting pipe that draws out methane (4)；

The connecting pipe that draws out methane (4) is extended in idle air conveyance conduit (7a), and idle air conveyance conduit corresponding thereto The exhaust outlet of the tube wall of (7a) and the connecting pipe (4) that draws out methane respectively leaves distance.

2. coal mine methane according to claim 1 and the blending processing system to draw out methane, it is characterised in that described mixes Mixed processing system also includes：The evacuated tube that draws out methane (2) and the blower cover that draws out methane (3)；The evacuated tube that draws out methane (2) Lower port connects with coal mine ground extraction pumping plant (1)；The blower cover that draws out methane (3) for conducting cover body structure, the extraction Gas blower cover (3) is arranged at the exit of evacuated tube (2) that draw out methane, and and atmosphere；It is described draw out methane draw The side wall of fan housing (3) offers air inducing hole, and the air inducing hole is connected with the air inlet of the connecting pipe that draws out methane (4).

3. coal mine methane according to claim 2 and the blending processing system to draw out methane, it is characterised in that the extraction Explosion suppression device (13) is provided with gas connecting pipe (4), the explosion suppression device (13) is by being installed on the connecting pipe that draws out methane (4) two groups of flame sensors (14) and on the blower cover that draws out methane (3) carry out blast monitoring.

4. coal mine methane according to claim 1 and the blending processing system to draw out methane, it is characterised in that described is weary Wind conveyance conduit (7a) is being provided with idle air wind regime regulating valve (16), idle air conveying close to the side of idle air blower cover (6) exhaust outlet Pipeline (7a) and draw out methane connecting pipe (4) joint upstream or be nearby provided with pressure sensor (17), the pressure sensing Device (17) carries out closed loop by monitoring the gas pressure before being blended in idle air conveyance conduit (7a), to idle air wind regime regulating valve (16) Automatically adjust.

5. coal mine methane according to claim 1 and the blending processing system to draw out methane, it is characterised in that described is mixed Close gas transmission pipeline (7b) and be provided with measuring instrument (18), the monitoring that the measuring instrument (18) passes through display in the downstream of blender (M) Value, closed loop VFC is carried out to air-introduced machine (11), realizes the control of mixed gas delivery pipeline (7b) interior gas flow.

6. coal mine methane according to claim 1 and the blending processing system to draw out methane, it is characterised in that described is mixed Close gas transmission pipeline (7b) and be provided with methane concentration monitor (19) close to the side of blender (M) outlet, it is dense by methane The continuous on-line monitoring of degree, the regulating valve that draws out methane (15) being provided with to the connecting pipe that draws out methane (4) carry out closed loop and adjusted automatically Section.

7. coal mine methane according to claim 1 and the blending processing system to draw out methane, it is characterised in that described is mixed Close gas transmission pipeline (7b) and demisting dehydration device (10), described demisting dehydration device are provided with the downstream of blender (M) (10) passage of conveying is flowed in into several supply by chevron-shaped arranged in parallel, for the gas after removing water droplet to be sent Enter in heat-accumulating type high-temperature oxidation unit (12).

8. coal mine methane according to claim 6 and the blending processing system to draw out methane, it is characterised in that described is mixed Close gas transmission pipeline (7b) and be provided with isolating valve (20) in the side close to air-introduced machine (11) entrance, the isolating valve (20) passes through first The monitoring result of alkane concentration monitoring device (19) controls its switch, surpasses when methane concentration monitor (19) monitors volume percent methane When crossing default threshold value, isolating valve (20) quick closedown so that heat-accumulating type high-temperature oxidation unit (12) and mixed gas delivery pipe Road (7b) thoroughly isolates.

9. coal mine methane according to claim 8 and the blending processing system to draw out methane, it is characterised in that described is weary The joint upstream of wind conveyance conduit (7a) and the connecting pipe (4) that draws out methane is provided with air intake duct (35), and the air enters The air inlet of tracheae (35) is directly provided with pressure-regulating valve (34), works as heat accumulating type with atmosphere, the air intake duct (35) After high-temperature oxidation device (12) is stopped transport, opened by closed-loop control pressure-regulating valve (34), utilize atmospheric equilibrium idle air delivery pipe Road (7a) and the negative pressure to draw out methane in connecting pipe (4).

10. coal mine methane according to claim 8 and the blending processing system to draw out methane, it is characterised in that described mixed Close gas transmission pipeline (7b) and be provided with emergent evacuation pipe (23) in the upstream of isolating valve (20), described emergent evacuation pipe (23) Upper port is directly and atmosphere, the emergent evacuation pipe (23) are provided with exhaust-valve (21) and emptying blower fan (22)；Work as heat accumulating type After high-temperature oxidation device (12) is stopped transport, blower fan (22) is opened and emptied by closed-loop control exhaust-valve (21) and is started, utilizes emptying Negative pressure caused by blower fan (22) is after idle air blower cover (6) extracts idle air purging mixed gas delivery pipeline (7b), by pipeline The gas of residual is discharged into air through emergent evacuation pipe (23).

11. coal mine methane according to claim 8 and the blending processing system to draw out methane, it is characterised in that described mixed Close gas transmission pipeline (7b) and be provided with emptying air inlet pipe (23b), described emptying air inlet pipe (23b) in the upstream of isolating valve (20) Air inlet directly and atmosphere, the emptying air inlet pipe (23b) is provided with emptying blower fan (22a) and intake valve (24)；It is described Idle air conveyance conduit (7a) be provided with emergent evacuation pipe (23a), the emergent evacuation pipe (23a) is arranged at idle air conveyance conduit The upstream of the joint of (7a) and the connecting pipe (4) that draws out methane, the emergent evacuation pipe (23a) are provided with exhaust-valve (21a)；When After heat-accumulating type high-temperature oxidation unit (12) is stopped transport, wind is opened and emptied by closed-loop control exhaust-valve (21a), intake valve (24) The startup of machine (22a), air purging mixed gas delivery pipeline (7b) and idle air are extracted from air using blower fan (22a) is emptied After conveyance conduit (7a), the gas remained in pipeline is discharged into air through emergent evacuation pipe (23a).

12. coal mine methane according to claim 1 and the blending processing system to draw out methane, it is characterised in that described The joint upstream of idle air conveyance conduit (7a) and the connecting pipe (4) that draws out methane is provided with breather pipe (37), the breather pipe (37) upper port is directly and atmosphere, the breather pipe (37) are provided with multifunction valve (38)；The mixed gas delivery pipe The end in road (7b) is provided with emptying air inlet pipe (23b), and one end of described emptying air inlet pipe (23b) directly and atmosphere, should Empty air inlet pipe (23b) and be provided with emptying blower fan (22a) and intake valve (24)；

After heat-accumulating type high-temperature oxidation unit (12) is stopped transport, by closed-loop control multifunction valve (38), intake valve (24) open with And the startup of emptying blower fan (22a), mixed gas delivery pipe is purged successively using emptying blower fan (22a) and extracting air from air Behind road (7b) and idle air conveyance conduit (7a), the gas remained in pipeline is discharged into air through breather pipe (37)；Or

After heat-accumulating type high-temperature oxidation unit (12) is stopped transport, blower fan (22a) is opened and emptied by closed-loop control intake valve (24) Startup, using empty negative pressure caused by blower fan (22a) from idle air blower cover (6) extract idle air purging mixed gas delivery pipeline After (7b), the gas remained in pipeline is discharged into air through emptying air inlet pipe (23b)；Or

After heat-accumulating type high-temperature oxidation unit (12) is stopped transport, by closed-loop control intake valve (24), multifunction valve (38) open and The startup of blower fan (22a) is emptied, air purging idle air conveyance conduit (7a) and mixed gas delivery pipe are extracted from breather pipe (37) Behind road (7b), the gas remained in pipeline is discharged into air through emptying air inlet pipe (23b).

13. coal mine methane according to claim 12 and the blending processing system to draw out methane, it is characterised in that work as accumulation of heat After formula high-temperature oxidation device (12) is stopped transport, atmospheric equilibrium idle air delivery pipe is utilized after being opened by closed-loop control multifunction valve (38) Road (7a) and the pressure to draw out methane in connecting pipe (4).

14. coal mine methane according to claim 1 and the blending processing system to draw out methane, it is characterised in that described Blending processing system also includes chimney (27), described chimney (27) by provided with clean gas conveyance conduit (26) and accumulation of heat Formula high-temperature oxidation device (12) connects, for clean gas caused by heat-accumulating type high-temperature oxidation unit (12) oxidation processes to be discharged into Air；Described clean gas conveyance conduit (26) is provided with clean gas valve (28), for controlling clean gas conveyance conduit (26) opening and closing.

15. coal mine methane according to claim 14 and the blending processing system to draw out methane, it is characterised in that described Blending processing system also includes steam boiler (31), described steam boiler (31) and chimney (27) by provided with hot blast it is defeated Pipeline (30) is sent to be connected with heat-accumulating type high-temperature oxidation unit (12), the steam boiler (31) is used to absorb heat-accumulating type high-temperature oxidation dress Put high-temperature hot-air caused by (12) and carry out heat energy utilization；Described hot blast conveying pipe road (30) is provided with by hot-blast valve (29) and hot blast Port valve (32), described hot-blast valve (29) is used for the break-make for controlling hot blast conveying pipe road (30) and steam boiler (31), described Hot blast by-passing valve (32) is used for the break-make for controlling hot blast conveying pipe road (30) and chimney (27).

16. coal mine methane according to claim 1 and the blending processing system to draw out methane, it is characterised in that described Grading ring (36) is provided with air-introduced machine (11), described grading ring (36) is used to measure the gas in mixed gas delivery pipeline (7b) Body flow.