CN113217079B - Pressure equalizing circulation mine gas extraction coal hole - Google Patents
Pressure equalizing circulation mine gas extraction coal hole Download PDFInfo
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- CN113217079B CN113217079B CN202110222570.5A CN202110222570A CN113217079B CN 113217079 B CN113217079 B CN 113217079B CN 202110222570 A CN202110222570 A CN 202110222570A CN 113217079 B CN113217079 B CN 113217079B
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- gas
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/18—Special adaptations of signalling or alarm devices
Abstract
The invention aims to eliminate air from being pumped into a gas extraction coal hole in a pressure equalizing circulating mine. The pressure equalizing circulating mine gas extraction coal hole oil comprises the following components: the ventilation coal roadway in the mine is sequentially connected with the coal roadway safety sealing wall of the drilling site, and the equal-pressure coal roadway mine gas extraction coal roadway is sealed according to the equal-pressure sealing wall of the non-lifting coal roadway; a gas pipe connected with a mine gas extraction pipeline in the ventilation coal roadway and inserted into a mine gas extraction hole; the mine gas extraction pipeline in the ventilation coal roadway is sequentially connected with a connecting pipeline, a blower and a gas injection pipe which is connected with a main gas injection pipe and is inserted into the equal-pressure coal roadway. The air blower extracts the pure gas in the mine gas extraction pipeline and injects the pure gas into the equal-pressure coal roadway. The electromagnetic valve on the gas injection pipe automatically regulates and controls the gas injection flow to keep the air pressure in the equal-pressure coal roadway equal to the air pressure in the ventilation coal roadway. The invention is suitable for various coal seams.
Description
The invention relates to mine gas extraction, belonging to the mining technology.
In the background technology, a gas extraction hole in the existing mine coal layer, a gas pipe inserted into the hole opening are directly and sequentially connected with a mine gas extraction pipeline in a ventilation coal roadway and a gas extraction vacuum pump on the ground. After the vacuum pump is started, because the air pressure in the ventilation coal roadway is higher than the air pressure in the gas extraction coal hole, a large amount of air flows through the cracks in the coal layer, is pumped into the gas extraction coal hole and the gas pipe and is mixed with the gas in the coal layer pumped into the gas extraction coal hole, and the mixed gas is reserved
Disclosure of Invention
The invention aims to block air in a ventilation coal roadway from being pumped into a gas extraction coal hole so as to ensure that the mine gas is extracted to produce pure gas.
By implementing the invention, a ventilation coal roadway in a mine coal layer, a drilling site coal roadway vertical to the ventilation coal roadway, a safety sealing wall, a safety coal roadway, an equal-pressure sealing wall, an equal-pressure coal roadway and a gas extraction coal hole are sequentially connected. The gas pipe inserted into the gas extraction hole, the mine gas extraction pipeline for transporting pure gas in the ventilation coal roadway and the gas extraction vacuum pump on the ground are connected in sequence, and a gap between the gas pipe and the coal hole wall is filled with filler to seal the gas extraction hole. In the ventilation coal roadway, a mine gas extraction pipe, a connecting pipe, a blower, a main gas injection pipeline and a gas injection pipe inserted into the equal-pressure coal roadway are sequentially connected. The gas replacement pipe inserted into the equal-pressure coal roadway, the auxiliary mine gas extraction pipeline in the ventilation coal roadway and the auxiliary gas extraction vacuum pump on the ground are sequentially connected. The gas filling pipe is arranged at the bottom of the gas filling pipe, and the gas filling pipe is arranged at the bottom of the gas filling pipe.
The invention is implemented with a gas flowmeter and a gas concentration meter on the gas pipe. The gas pipe is opened, gas in the coal layer is pumped into the gas extraction coal hole, and air in the equal-pressure coal roadway also flows through the gas leakage crack in the coal layer and is pumped into the gas extraction coal hole at the gas leakage flow rate. Air and gas flow into the gas pipe after being mixed. And the gas flow can be calculated by reading the flowmeter and the gas concentration meter. Subtracting the gas flow from the reading of the flowmeter to obtain the leakage flow.
The invention is implemented, there are electromagnetic valve and gas flowmeter in the tube on the gas filling pipe. The gas replacing pipe is provided with an electromagnetic valve and a gas concentration meter. The flow rates of the electromagnetic valves on the gas replacement pipe and the gas injection pipe are set as leakage flow rates. Closing the gas pipe, simultaneously opening the gas injection pipe and the gas replacement pipe, pumping air in the equal-pressure coal roadway by the gas replacement pipe at the leakage flow, and simultaneously injecting gas at the leakage flow into the equal-pressure coal roadway by the gas injection pipe to replace the air, so that the gas leaked from the equal-pressure coal roadway through the leakage crack as the gas pumping hole is pure gas. The volume of the gas in the equal-pressure coal roadway is unchanged, the pressure of the gas is kept equal to the pressure of the ventilation coal roadway, and no gas communication is blocked between the coal roadways at the two sides of the equal-pressure airtight wall.
According to the invention, a pressure difference meter for measuring the difference between the air pressure in the ventilation coal roadway and the air pressure in the equal-pressure coal roadway is arranged in the coal roadway of the drilling site, and the pressure difference meter is connected with an electromagnetic valve on a gas injection pipe. When the gas concentration meter on the gas exchange tube indicates that no air exists in the tube, the gas exchange tube is closed, the gas tube is opened, and the gas extraction hole formally produces pure gas. At this time, the gas in the equal-pressure coal roadway circularly flows along the gas leakage cracks, the gas extraction holes, the gas pipes, the mine gas extraction pipes, the connecting pipes, the blower, the main gas injection pipe, the gas injection pipe and the equal-pressure coal roadway at the gas leakage flow. When the pressure difference meter measures that the pressure in the ventilation roadway is higher than the pressure in the equal-pressure coal roadway, the electromagnetic valve on the gas injection pipe automatically increases the gas flow, otherwise, the gas flow is reduced, and the equal pressure and no gas communication in the coal roadway at the two sides of the equal-pressure sealing wall are maintained. When the flow meter on the gas injection pipe is equal to the flow meter standard number on the gas pipe, the gas pipe and the gas injection pipe are closed, and extraction is finished.
By implementing the invention, the equal-pressure coal roadway is connected with the coal holes which are successful in sector hole arrangement in the surrounding coal layer, and the coal holes are connected with the cracks in the coal layer.
By implementing the invention, the gas in the equal-pressure coal roadway needs to be prevented from leaking into the ventilation coal roadway. The safety coal roadway is internally provided with a gas probe which is connected with a gas audible and visual alarm in the coal roadway of the drilling site. When the pressure in the isobaric coal roadway is higher than the pressure in the ventilation coal roadway, the gas in the isobaric coal roadway flows into the safety coal roadway. Namely, alarming, personnel regulate and control an electromagnetic valve on the gas injection pipe, and gas injection flow is reduced. The gas probe is connected with an electromagnetic valve on the gas injection pipe, so that the gas injection flow is reduced when gas appears in the safe coal roadway.
The invention is implemented to prevent air from leaking into the gas extraction coal holes. Therefore, when the gas concentration meter on the gas pipe shows that the gas concentration is reduced, a person can regulate the electromagnetic valve on the gas injection pipe to increase the gas injection flow, and a technology can be added to increase the gas injection flow when the electromagnetic valve on the gas injection pipe with the oxygen probe in the gas pipe extracts oxygen in the tile pipe.
According to the invention, a water-filled air pressure difference measuring U-shaped glass tube is arranged in the coal roadway of the drilling site, and one end of the U-shaped glass tube is connected with a conduit inserted into the equal-air-pressure coal roadway. Personnel observe the water column liquid level in the two U-shaped pipes, regulate and control the electromagnetic valve on the gas injection pipe to increase and decrease the gas injection flow, and keep the liquid level of the two pipes equal.
By implementing the invention, the ventilation coal roadway, the safety coal roadway and the equal-pressure coal roadway are realized. To spray concrete wall supports. The end of the equal-pressure coal roadway and the two wall surfaces of the sealing wall are covered by sprayed concrete.
By implementing the invention, the mine gas extraction pipeline, the auxiliary mine gas extraction pipeline and the main gas injection pipeline are equal to the ventilation coal roadway in length, and two sides of the ventilation coal roadway are respectively connected with a plurality of pressure equalizing circulating gas extraction holes. And the equal-pressure coal roadway is connected with a plurality of gas extraction coal holes in the coal layer, and gaps between gas pipes inserted into the coal holes and the wall of the holes are filled with fillers.
Drawings
FIG. 1 shows a conventional mine gas extraction aperture
In the figure, 1 is a mine ventilation coal roadway, 2 is a drilling site coal roadway, 3 is a gas extraction coal hole, 4 is a gas pipe, 5 is a filler, and 6 is a mine gas extraction pipeline.
FIG. 2 is a diagram of a gas extraction aperture of a pressure equalizing circulation mine
In the figures, the subsidiary marks 1 to 6 are identical to the subsidiary mark diagram of fig. 1. In the figure, 7 is a connecting pipeline, 8 is a blower, 9 is a main gas injection pipeline, 10 is a gas injection pipe, 12 is a gas replacement pipe, 13 is a gas flow arrow, 16 is an equal pressure sealing wall, 17 is an equal pressure coal roadway, 18 is an electromagnetic valve, 19 is an in-pipe gas flowmeter, 20 is an in-pipe gas concentration meter, 21 is a gas leakage crack, and 22 is a gas alarm.
Detailed Description
The technology is to reform the existing mine gas extraction coal hole into a pressure equalizing circulating gas extraction coal hole to produce pure gas. And (3) using an air pick to collect coal from the coal bed at the end part of the coal roadway of the drilling site, and prolonging the coal roadway of the drilling site. After the fracture, constructing an equal-pressure airtight wall, and forming an extension section of the coal roadway of the drilling site into the equal-pressure coal roadway. Finally, pipes, ducts, blowers and various instrument valves were constructed as per fig. 2.
Claims (8)
1. The utility model provides a pressure equalizing circulation mine gas extraction coal mining hole for produce pure gas at the coal seam, characterized by: the coal roadway ventilated in the coal layer, the drilling site coal roadway vertical to the ventilated coal roadway, the safety sealing wall, the safety coal roadway, the equal-pressure sealing wall, the equal-pressure coal roadway and the gas extraction coal holes are sequentially connected; the gas pipe inserted into the gas extraction hole, the mine gas extraction pipeline for transporting pure gas in the ventilation coal roadway and the gas extraction vacuum pump on the ground are sequentially connected, and a gap between the gas pipe and the wall of the gas extraction hole is filled with filler to seal the gas extraction hole; the mine gas extraction pipeline, the connecting pipeline, the air blower, the main gas injection pipeline and the gas injection pipe are sequentially connected; the gas replacement pipe inserted into the equal-pressure coal roadway, the mine auxiliary gas extraction pipeline in the ventilation coal roadway and the auxiliary gas extraction vacuum pump on the ground are sequentially connected; the safety sealing wall, the safety coal roadway, the equal-pressure sealing wall, the equal-pressure coal roadway, the gas extraction coal holes, the gas pipe, the gas injection pipe and the gas replacement pipe form pressure equalizing circulation mine gas extraction coal holes;
a differential pressure gauge for measuring the difference between the air pressure in the ventilation coal roadway and the air pressure in the equal-pressure coal roadway is connected with an electromagnetic valve on the gas injection pipe; after the gas concentration meter on the gas replacement pipe marks that no air exists in the equal-pressure coal roadway, the gas replacement pipe is closed; opening a gas pipe to formally produce coal bed gas; reading on the differential pressure gauge automatically regulates and controls an electromagnetic valve on the gas injection pipe, increases and decreases the gas flow injected into the equal-pressure coal roadway, and keeps equal gas pressure and no gas communication in the coal roadway at two sides of the equal-pressure sealing wall;
the equal-pressure coal roadway is connected with a plurality of coal holes which are formed in the peripheral coal layer in a fan-shaped mode, and the coal holes are connected with cracks in the coal layer.
2. The pressure equalizing recycle mine gas extraction coal mining hole of claim 1, for producing pure gas in coal seams, wherein: the gas pipe is provided with an in-pipe gas flowmeter and a gas concentration meter, the gas pipe is opened, gas in the coal layer is pumped into the gas extraction hole, the gas pipe and the mine gas extraction pipeline, and air in an equal-pressure coal roadway also flows through the gas leakage crack in the coal layer and is pumped into the gas extraction hole and the gas pipe at a gas leakage flow rate; and (3) reading by using a flowmeter and a gas concentration meter on the gas pipe, and closing the gas pipe after calculating the leakage flow in the leakage crack.
3. The pressure equalizing recycle mine gas extraction coal mining hole of claim 1, for producing pure gas in coal seams, wherein: the gas injection pipe is provided with an electromagnetic valve and a gas flowmeter in the pipe; the gas replacement pipe is provided with an electromagnetic valve and a gas concentration meter; after the gas flow values of electromagnetic valves on the gas injection pipe and the gas replacement pipe are set to be equal to the leakage flow, the gas injection pipe and the gas replacement pipe are simultaneously opened, the gas replacement pipe pumps out air in the isobaric coal roadway at the leakage flow, and the gas injection pipe injects the gas replacement air with the flow equal to the leakage flow into the isobaric coal roadway at the leakage flow.
4. The pressure equalizing recycle mine gas extraction coal mining hole of claim 1, for producing pure gas in coal seams, wherein: a gas probe in the safe coal roadway is connected with a gas alarm in the coal roadway of the drilling site, and when gas in equal pressure leaks into the safe coal roadway, an audible and visual alarm is sent out; the gas probe is also connected with an electromagnetic valve on the gas injection pipe, gas appears in the safe coal roadway, and the electromagnetic valve reduces the gas injection flow.
5. The pressure equalizing recycle mine gas extraction coal mining hole of claim 1, for producing pure gas in coal seams, wherein: an oxygen probe is arranged in the gas pipe and is connected with an audible and visual alarm in a coal roadway of a drilling site, when oxygen appears in the gas pipe, an alarm is given, and a person operates an electromagnetic valve on the gas injection pipe to increase the gas injection flow; the oxygen probe is connected with an electromagnetic valve on the gas injection pipe, and when oxygen appears in the gas pipe, the electromagnetic valve regulates and controls to increase the gas injection flow.
6. The pressure equalizing recycle mine gas extraction aperture of claim 1 for producing pure gas in a coal seam, wherein; the ventilation coal roadway, the drilling site coal roadway, the safety coal roadway and the equal-pressure coal roadway are supported by the sprayed concrete wall, and the peripheral coal seams of the ventilation coal roadway, the drilling site coal roadway, the safety coal roadway and the equal-pressure coal roadway are plugged by grouting coal holes; the end coal walls of the equal-pressure coal roadway and two wall surfaces of each sealing wall are covered by sprayed concrete.
7. The pressure equalizing recycle mine gas extraction coal mining hole of claim 1, for producing pure gas in coal seams, wherein: a water-filled air pressure difference measuring U-shaped glass tube is arranged in the coal roadway, and a conduit connected with one end of the U-shaped glass tube is inserted into the equal-air-pressure coal roadway; personnel regulate and control the electromagnetic valve on the gas injection pipe in the coal roadway so as to increase and decrease the gas injection flow and keep the water level in the two pipes of the U-shaped pipe equal.
8. The pressure equalizing recycle mine gas extraction coal mining hole of claim 1, for producing pure gas in coal seams, wherein: the mine gas extraction pipeline, the main gas injection pipeline and the auxiliary mine gas extraction pipeline are equal to the ventilation coal roadway in length, and a plurality of pressure equalizing circulating gas extraction holes are formed in the coal layers at two sides of the ventilation coal roadway; and the equal-pressure coal roadway is connected with a plurality of gas extraction coal holes in the coal layer, and the gaps between the gas pipes inserted into the coal holes and the hole walls are filled with fillers.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110222570.5A CN113217079B (en) | 2021-03-01 | 2021-03-01 | Pressure equalizing circulation mine gas extraction coal hole |
| PCT/CN2022/070253 WO2022183843A1 (en) | 2021-03-01 | 2022-01-05 | Gas extraction coal hole of pressure-equalizing cycle mine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110222570.5A CN113217079B (en) | 2021-03-01 | 2021-03-01 | Pressure equalizing circulation mine gas extraction coal hole |
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| Publication Number | Publication Date |
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| CN113217079A CN113217079A (en) | 2021-08-06 |
| CN113217079B true CN113217079B (en) | 2023-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110222570.5A Active CN113217079B (en) | 2021-03-01 | 2021-03-01 | Pressure equalizing circulation mine gas extraction coal hole |
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| CN (1) | CN113217079B (en) |
| WO (1) | WO2022183843A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113217079B (en) * | 2021-03-01 | 2023-07-14 | 柴兆喜 | Pressure equalizing circulation mine gas extraction coal hole |
| CN115573764B (en) * | 2022-11-23 | 2023-05-09 | 中国矿业大学(北京) | Ultrasonic secondary impact downward pressure pumping integrated gas concentration device and concentration method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB279189A (en) * | 1926-08-05 | 1927-10-27 | Arthur Ernest Moore | Improvements in or relating to signalling apparatus used in mines, shafts and like places |
| CN103670338B (en) * | 2012-09-21 | 2016-06-15 | 新奥气化采煤有限公司 | A kind of coal bed gas and coal mining method altogether |
| CN102943687B (en) * | 2012-12-03 | 2014-08-20 | 中国矿业大学 | Pressure equalizing and hole sealing method for gas extraction drilling |
| CN103321613A (en) * | 2013-07-03 | 2013-09-25 | 胜利油田隆迪石油技术(装备)有限责任公司 | Method and device for exploiting coal bed methane by discharging water and pulverized coal |
| CN107420126B (en) * | 2017-07-26 | 2024-03-29 | 柴兆喜 | Pressure equalizing circulation mine gas extraction system |
| CN110273710A (en) * | 2018-03-14 | 2019-09-24 | 柴兆喜 | Tunnel gas library in mine |
| CN110273664A (en) * | 2018-03-14 | 2019-09-24 | 柴乔森 | Gas production device contained by coal seam with circulating mash gas extraction pump |
| CN109252884B (en) * | 2018-09-13 | 2020-01-07 | 辽宁工程技术大学 | Gob-side entry retaining working face Y-shaped ventilation pressure regulating disaster prevention method |
| CN111472832B (en) * | 2020-04-09 | 2021-01-15 | 中国矿业大学 | Coal bed gas self-circulation gas injection yield increasing method |
| CN111734488A (en) * | 2020-05-14 | 2020-10-02 | 淮北矿业股份有限公司 | Goaf enclosure wall pressure regulating air chamber |
| CN113217079B (en) * | 2021-03-01 | 2023-07-14 | 柴兆喜 | Pressure equalizing circulation mine gas extraction coal hole |
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2021
- 2021-03-01 CN CN202110222570.5A patent/CN113217079B/en active Active
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- 2022-01-05 WO PCT/CN2022/070253 patent/WO2022183843A1/en active Application Filing
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| Publication number | Publication date |
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| CN113217079A (en) | 2021-08-06 |
| WO2022183843A1 (en) | 2022-09-09 |
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