阅读说明：本技术 综采工作面回撤期间采空区的注氮防火装置及措施 (Nitrogen injection fire protection device and measure for goaf during fully mechanized mining face withdrawal period ) 是由 刘成波 刘博� 苗于惠 王谦磊 于 2021-08-17 设计创作，主要内容包括：本发明公开了一种综采工作面回撤期间采空区的注氮防火装置及措施,注氮防火措施主要包括：加强采空区的堵漏措施、工作面的减风措施、加强采空区的注氮措施,其包括：在采空区运输顺槽一侧预设注氮埋管并通过制氮机进行注氮,注氮埋管延伸至工作面进风隅角的采空区以内；及从进风隅角前的绞车洞室斜向设置注氮斜孔,其延伸至采空区以内、加强对采空区的气体监测措施以及加强对支架上部浮煤氧化的监测措施的在靠近进风隅角一侧的多个液压支架的支架尾梁的上方设置多个监测钻孔,并在多个监测钻孔内插入束管单管用以监测进风隅角一侧多个液压支架的支架尾梁上方煤层底板2～3m内的CO气体浓度。借此,可以有效地抑制工作面采空区的CO气体超标问题。(The invention discloses a nitrogen injection fire protection device and measures for a goaf during fully mechanized coal mining face withdrawal period, wherein the nitrogen injection fire protection measures mainly comprise: strengthen the leaking stoppage measure in collecting space area, the measure of the air reduction of working face, strengthen the measure of annotating nitrogen in collecting space area, it includes: presetting a nitrogen injection buried pipe at one side of the goaf transportation crossheading and injecting nitrogen through a nitrogen making machine, wherein the nitrogen injection buried pipe extends to the inside of the goaf of the working face air inlet corner; and a nitrogen injection inclined hole is obliquely arranged in the winch cavity in front of the air inlet corner, extends into the goaf, strengthens gas monitoring measures on the goaf and strengthens monitoring measures on the oxidation of float coal on the upper part of the support, a plurality of monitoring drill holes are arranged above the support tail beams of the plurality of hydraulic supports close to one side of the air inlet corner, and a beam tube single tube is inserted into the plurality of monitoring drill holes to monitor the concentration of CO gas in a range of 2-3 m above the coal bed bottom plate above the support tail beams of the plurality of hydraulic supports on one side of the air inlet corner. Therefore, the problem that CO gas in the goaf of the working face exceeds the standard can be effectively solved.)

1. A nitrogen injection fire protection device for a goaf during fully mechanized coal mining face withdrawal, comprising:

the nitrogen making machine is arranged in the transportation gate way;

the nitrogen injection buried pipe extends from the nitrogen making machine to the goaf of the working face air inlet corner;

the leakage blocking materials are arranged at the air inlet corner and a plurality of hydraulic supports of the support assembly close to the air inlet corner;

the nitrogen injection inclined hole extends obliquely from the winch chamber in front of the air inlet corner to the inner side of the goaf; and

and the beam tube monitoring system is embedded in the return air gateway and is used for monitoring the concentration of the CO gas on the working surface.

2. The nitrogen-injection fire protection device for a goaf during the withdrawal of the fully mechanized mining face of claim 1, wherein an outlet of the nitrogen-injection buried pipe is disposed 25m or 50m inside the goaf of the air intake corner.

3. The nitrogen-injection fire protection device for a gob during withdrawal of a fully mechanized mining face of claim 1, further comprising a plurality of monitoring boreholes disposed above the support beams of the plurality of hydraulic supports adjacent one side of the air intake corner.

4. The nitrogen-injection fire protection device for a gob during withdrawal of a fully mechanized mining face of claim 3, wherein the plurality of monitoring boreholes are spaced apart by 10 of the hydraulic supports.

5. The nitrogen injection fire protection device for the goaf during the fully mechanized mining face withdrawal period of claim 3, further comprising a beam tube monotube, which is disposed in the monitoring boreholes and is in data communication with the beam tube monitoring system, and the beam tube monotube is used for monitoring whether CO gas in a 2-3 m seam floor above the hydraulic support tail boom on the side of the air inlet corner exceeds standard.

6. A nitrogen-injection fire protection measure for a goaf during withdrawal of a fully mechanized mining face, which employs the nitrogen-injection fire protection apparatus of claims 1 to 5, wherein the nitrogen-injection fire protection measure comprises:

and (3) reinforcing the leakage stoppage measure of the goaf: plugging is carried out at the air inlet corner and a plurality of hydraulic supports of the support assembly close to the air inlet corner by adopting plugging materials;

the wind reduction measure of the working face is as follows: the air intake of the working face is reduced;

strengthen the nitrogen injection measure in collecting space area, it includes:

presetting a nitrogen injection buried pipe at one side of the goaf transportation crossheading and injecting nitrogen through a nitrogen making machine, wherein the nitrogen injection buried pipe extends to the inside of the goaf of the working face air inlet corner; and

a nitrogen injection inclined hole is obliquely arranged from the winch cavity in front of the air inlet corner and extends into the goaf;

and (3) strengthening the gas monitoring measure of the goaf: a beam tube monitoring system is pre-embedded in the return air crossheading for monitoring the concentration of CO gas on a working surface; and

and (3) strengthening the monitoring measures for oxidizing the float coal on the upper part of the bracket: a plurality of monitoring drill holes are formed above the support tail beams of the hydraulic supports close to one side of the air inlet corner, and beam tube single tubes are inserted into the monitoring drill holes to monitor the concentration of CO gas in a coal bed bottom plate 2-3 m above the support tail beams of the hydraulic supports on one side of the air inlet corner.

7. The nitrogen-injection fire protection measure for the goaf during the fully mechanized mining face withdrawal of claim 6, wherein the plurality of monitoring boreholes are spaced at 10 hydraulic supports, and wherein the face draft of the face air reduction measure is from 1000m³Min is reduced to 450m³/min。

8. The nitrogen-injection fire protection measure for the goaf during the fully mechanized coal mining face withdrawal of claim 6, further comprising a float coal oxidation suppression measure for the upper portion of the support, comprising:

drilling target nitrogen injection holes into a coal seam floor at the frame joints of a plurality of hydraulic supports with CO gas concentration exceeding the standard or 3-6 m behind tail beams of the supports, wherein the target nitrogen injection holes extend to 2-3 m inside the coal seam floor, and injecting nitrogen into the target nitrogen injection holes through nitrogen injection branch pipes; and

and drilling water injection holes in the upper 3-5 m positions of the hydraulic supports, which exceed the CO gas concentration standard, into the coal seam bottom plate, and injecting water into the water injection holes for cooling.

9. Heddle according to claim 8The nitrogen injection fire prevention measure of the goaf during the withdrawal of the working face is characterized in that the nitrogen injection amount of each target nitrogen injection hole is 190m³/h～210m³H, the water injection quantity of each water injection hole is between 19m³/h～21m³Is between/h.

10. The nitrogen-injection fire protection measure for the goaf during the fully mechanized mining face withdrawal period of claim 6, further comprising an intermittent gas drainage measure for the face air chamber and the buried pipe, wherein during the face withdrawal period, the gas drainage of the face air chamber and the buried pipe of the goaf is stopped as long as the gas on the face is not over-limited.

Technical Field

The invention relates to the field of coal mining, in particular to a nitrogen injection fire protection device and measures for a goaf during the withdrawal period of a fully mechanized coal mining face.

Background

As shown in figure 1, the thickness of a coal layer of a mining working face of a plurality of coal mines is about 6-10 m, the average thickness is about 8m, fully mechanized top coal caving mining is adopted, the inclined length is 150m, 101 hydraulic supports (support assemblies 9) are arranged on the working face, 6 transition supports and 95 basic supports are arranged, an air inlet corner 11 is arranged on the 1# hydraulic support side, an air return corner 12 is arranged on the 101# hydraulic support side, and frame removing operation is carried out after net hanging on the working face is completed. When the rack is removed, the air quantity of a working face is about 1000m3/min, the coal bed has a natural ignition tendency, generally a type II natural ignition coal bed, the shortest natural ignition period of the coal bed is about 55 days, and the natural ignition period is 3-6 months. The technology of buried pipes, upper corner air chamber drainage and the like in the goaf is adopted to prevent and control gas.

The working face oxidation condition and the oxidized float coal position condition are as follows:

referring to fig. 1, during the working face retraction, for example, the CO gas concentration at the top beam of one (20) support was measured to be 200ppm, the CO gas concentration at the boundary between the tail beam of the other (18) support and the gob was measured to be 115ppm, and the oxygen concentration was measured to be 16.5%. According to the analysis of the occurrence place and the quantity of CO gas on the working face, the float coal is oxidized violently at the rear part of the support on the working face at present, the position where the CO occurs is close to the No. 18-No. 20 support on the transport gate 2 (air inlet side) on the working face, in addition, the oxygen concentration is lower after the No. 1-No. 10 support, the oxidized float coal in the goaf is close to the support, the position is about 2-8 m in the goaf within the No. 10 support-No. 20 support, because if the oxidized float coal is far away from the support, the CO gas should return to the corner to the maximum under the action of the negative pressure of the working face, and the CO gas does not exist at the corner of the return to the corner on the working face, the CO gas generated by the oxidation of the oxidized float coal is far away from the support, and the CO gas does not reach the corner of the return to the air and directly flows out of the No. 18 support. The reason why the higher concentration CO gas appears in the goaf is as follows: firstly, the working face is too slow to hang nets for 1 month, so that the float coal in the goaf has sufficient oxidation time. Secondly, when the working face goaf nitrogen injection place is normal in the working face advancing degree, nitrogen injection from the air inlet corner to the position 25m inside the goaf is reasonable, but if the working face advancing degree is too slow, the float coal from the air inlet corner to the position 25m inside the goaf of the working face cannot inject nitrogen, and the float coal is oxidized for a long time, so that CO gas with high concentration is generated.

In order to avoid the situation, the nitrogen injection fire protection device and the measures of the goaf during the withdrawal of the fully mechanized mining face need to be adopted for defense.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

Disclosure of Invention

The invention aims to provide a nitrogen injection fire protection device for a goaf during the withdrawal period of a fully mechanized mining face, which can effectively solve the problem of float coal oxidation of the goaf during the withdrawal period of the fully mechanized mining face.

Another object of the present invention is to provide a nitrogen-injecting fire-protection measure for a goaf during the withdrawal of a fully mechanized mining face, which can effectively suppress the problem of overproof of CO gas in the goaf during the withdrawal of the fully mechanized mining face.

In order to achieve the aim, the invention provides a nitrogen injection fire protection device for a goaf during the withdrawal period of a fully mechanized coal mining face, which comprises a nitrogen making machine, a nitrogen injection buried pipe, a plugging material, a nitrogen injection inclined hole and a beam pipe monitoring system; the nitrogen making machine is arranged in the transportation gate way; the nitrogen injection buried pipe extends from the nitrogen making machine to the goaf of the working face air inlet corner; the plugging materials are arranged at the air inlet corner and a plurality of hydraulic supports of the support assembly close to the air inlet corner; the nitrogen injection inclined hole extends into the goaf from the winch cavity in front of the air inlet corner in an inclined manner; the beam tube monitoring system is buried in the return air gateway and used for monitoring the concentration of CO gas on the working surface.

In a preferred embodiment, the outlet of the nitrogen injection buried pipe is arranged at the position of 25m or 50m in the goaf of the air inlet corner.

In a preferred embodiment, the nitrogen injection fire protection device for the goaf during the withdrawal of the fully mechanized mining face further comprises a plurality of monitoring boreholes disposed above the support tail beams of the plurality of hydraulic supports on the side near the air intake corners.

In a preferred embodiment, the plurality of monitor boreholes are spaced 10 hydraulic supports apart.

In a preferred embodiment, the nitrogen injection fire protection device for the goaf during the fully mechanized mining face withdrawal period further comprises a beam tube single tube which is arranged in the monitoring drill holes and is communicated with the beam tube monitoring system in a data mode, and the beam tube single tube is used for monitoring whether CO gas in a coal bed bottom plate 2-3 m above the hydraulic support tail beams on one side of the air inlet corner exceeds the standard or not.

In order to achieve the above object, the present invention further provides a nitrogen injection fire protection measure for a goaf during the withdrawal of a fully mechanized mining face, which employs the nitrogen injection fire protection device as described above, wherein the nitrogen injection fire protection measure comprises: and (3) reinforcing the leakage stoppage measure of the goaf: plugging by adopting plugging materials at the air inlet corner and a plurality of hydraulic supports of the support assembly close to the air inlet corner; the wind reduction measure of the working face is as follows: the air intake of the working face is reduced; strengthen the nitrogen injection measure in collecting space area, it includes: presetting a nitrogen injection buried pipe at one side of the goaf transportation crossheading and injecting nitrogen through a nitrogen making machine, wherein the nitrogen injection buried pipe extends to the inside of the goaf of the working face air inlet corner; and a nitrogen injection inclined hole is obliquely arranged from the winch cavity in front of the air inlet corner and extends into the goaf; and (3) strengthening the gas monitoring measure of the goaf: a beam tube monitoring system is pre-embedded in the return air crossheading for monitoring the concentration of CO gas on a working surface; and enhancing the monitoring measure of the oxidation of the float coal on the upper part of the bracket: a plurality of monitoring drill holes are formed above the support tail beams of the hydraulic supports close to one side of the air inlet corner, and beam tube single tubes are inserted into the monitoring drill holes to monitor the concentration of CO gas in a range of 2-3 m above the coal bed bottom plate above the support tail beams of the hydraulic supports on one side of the air inlet corner.

In a preferred embodiment, the interval of the monitoring drill holes is 10 hydraulic supports, and the working face air volume of the wind reduction measure of the working face is 1000m³Min is reduced to 450m³/min。

In a preferred embodiment, the nitrogen injection fire protection measure of the goaf during the withdrawal of the fully mechanized mining face further comprises a float coal oxidation inhibiting measure on the upper portion of the support, which comprises: drilling target nitrogen injection holes into the coal seam floor at the frame joints of a plurality of hydraulic supports with the concentration of CO exceeding the standard or 3-6 m behind tail beams of the supports, wherein the target nitrogen injection holes extend to the coal seam floor for 2-3 m and inject nitrogen into the target nitrogen injection holes through nitrogen injection branch pipes; and drilling water injection holes in the coal seam bottom plate at the positions 3-5 m away from the upper parts of the plurality of hydraulic supports with the overproof CO gas concentration, and injecting water into the water injection holes for cooling.

In a preferred embodiment, the nitrogen injection amount of each target nitrogen injection hole is between 190m³/h～210m³The water injection quantity of each water injection hole is between 19m³/h～21m³Is between/h.

In a preferred embodiment, the nitrogen injection fire prevention measure of the goaf during the fully mechanized mining face withdrawal period further comprises an intermittent gas drainage measure of the face air chamber and the buried pipe, and during the face withdrawal period, the gas drainage of the face air chamber and the buried pipe of the goaf is stopped as long as the gas of the face is not over-limited.

Compared with the prior art, the nitrogen injection fire protection device and the measures for the goaf during the fully mechanized coal mining face withdrawal period have the following beneficial effects: the nitrogen injection treatment is carried out on the inside of the float coal by arranging the nitrogen making machine and the pre-embedded nitrogen injection buried pipe in the transportation crossheading of the working face goaf, the monitoring of the oxidation of the float coal on the upper part of the bracket is enhanced by the pre-embedded beam pipe monitoring system in the return air crossheading, the measures of drilling, injecting nitrogen and injecting water are carried out on the position where CO gas exceeds the standard, the measures of stopping the leakage of the rake plugging material, reducing the air intake of the working face and the like are matched, the problems of the CO gas exceeding the standard and the oxidation of the float coal in the working face goaf can be effectively inhibited, the problems of the nature and the like of the float coal in the area are well solved, and the production safety of the working face goaf is ensured.

Drawings

FIG. 1 is a schematic plan view of a nitrogen-injected fire protection device according to an embodiment of the present invention;

fig. 2 is a schematic flow chart of the nitrogen injection fire-protection measure according to an embodiment of the present invention.

Description of the main reference numerals:

1-nitrogen making machine, 2-transportation gate way, 3-winch chamber, 4-nitrogen injection inclined hole, 5-plugging material, 6-nitrogen injection buried pipe, 601-nitrogen injection branch pipe, 7-target nitrogen injection hole, 8-hydraulic support, 9-support assembly, 10-return air gate way, 11-air inlet corner and 12-return air corner.

Detailed Description

The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.

Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.

As shown in fig. 1, the nitrogen injection fire protection device for the goaf during the fully mechanized mining face withdrawal according to the preferred embodiment of the present invention mainly comprises a nitrogen making machine 1, a nitrogen injection buried pipe 6, a plugging material 5, a nitrogen injection inclined hole 4, a bundle pipe monitoring system, and the like. The nitrogen generator 1 is arranged in the transportation gate way 2. The nitrogen injection buried pipe 6 extends from the nitrogen making machine 1 to the goaf inside the working face air inlet corner 11. The lost circulation material 5 is disposed at the intake corner 11 and at the plurality of hydraulic supports 8 of the support assembly 9 adjacent to the intake corner 11. The nitrogen injection inclined hole 4 extends obliquely from the winch chamber 3 in front of the air inlet corner 11 to the goaf. The beam tube monitoring system is embedded in the return air gateway 10 and is used for monitoring the concentration of CO gas on the working surface.

In some embodiments, the outlet of the nitrogen injection buried pipe 6 is arranged at about 25m or about 50m inside the goaf of the air intake corner 11.

In some embodiments, the nitrogen injection fire protection device of the gob during withdrawal of the fully mechanized mining face further includes a plurality of monitoring boreholes disposed above the support tail beams of the plurality of hydraulic supports 8 adjacent to one side of the air intake corner 11. The plurality of monitoring boreholes are spaced apart by about 10 hydraulic supports 8.

In some embodiments, the nitrogen injection fire protection device for the goaf during the fully mechanized mining face withdrawal period further comprises a beam tube single tube, the beam tube single tube is arranged in the monitoring drill holes and is simultaneously in data communication with a beam tube monitoring system, and the beam tube single tube is used for monitoring whether CO gas in a coal bed bottom plate 2-3 m above the tail beams of the hydraulic supports 8 on one side of the air inlet corner 11 exceeds the standard or not.

As shown in fig. 2, a nitrogen injection fire prevention measure for a goaf during withdrawal of a fully mechanized mining face according to a preferred embodiment of the present invention. Because the oxidized float coal in the goaf is close to the bracket assembly 9 and is positioned at one side of the transportation gate way 2, the oxidation speed is high, so that the mine needs to immediately strengthen the fire prevention measure and inhibit the oxidation of the float coal in the goaf. The nitrogen injection fire prevention mainly comprises the following measures:

(1) and (3) reinforcing the leakage stoppage measure of the goaf: the basic plugging of the goaf of the working face is already finished, and as air leakage also exists at the air inlet corner 11 of the working face, the floating coal on one side of the goaf transportation crossheading 2 is oxidized to generate CO, therefore, the air inlet corner 11 of the working face and about 10 nearby hydraulic supports 8 are necessary to be plugged by the rake plugging material 5. The rake plugging material 5 is frequently used in domestic coal mines, and no primary combustion accident occurs at present.

(2) The wind reduction measure of the working face is as follows: the air volume of the working face is 1000m³Min is reduced to 450m³/min。

(3) And (3) enhancing nitrogen injection measures of the goaf: 2 nitrogen making machines 1 in the mine are operated simultaneously, and the nitrogen injection flow is 1500m³And h, the nitrogen injection method is characterized in that a nitrogen injection buried pipe 6 is buried at one side of the goaf transportation crossheading 2, and a nitrogen outlet of the nitrogen injection buried pipe 6 is 25m and 50m above a working face air inlet corner 11. In addition, because the long time of the working surface screening causes the long-term oxidation of the float coal in the air inlet corner 11, a drilling machine must be arranged in the winch chamber 3 in front of the air inlet corner 11, a nitrogen injection inclined hole 4 is arranged, 1 nitrogen injection inclined hole 4 is drilled to the position of 10m in the goaf area of the air inlet corner 11, a sleeve pipe with the diameter of 50mm is arranged at the bottom of the hole in the nitrogen injection inclined hole 4, and the nitrogen is continuously injected into the nitrogen injection inclined hole 4.

(4) And (3) strengthening the gas monitoring measure of the goaf: the gas detection place is mainly a beam pipe (beam pipe monitoring system) buried at one side of the goaf return air gateway 10, and in addition, the gas is monitored through a gas drainage pipe and a support tail beam, so that the monitoring of the CO gas on the working face is enhanced.

(5) And (3) strengthening the monitoring measures for oxidizing the float coal on the upper part of the bracket: in the period of stoping of the working face, except for preventing the float coal in the goaf from oxidizing and naturally igniting, the monitoring on the temperature and the gas of the float coal on the upper part of the hydraulic support 8 is strengthened, and the float coal on the upper part of the hydraulic support 8 is prevented from oxidizing and naturally igniting, and the method comprises the following steps: and (3) respectively drilling monitoring drill holes on the upper parts of No. 10, No. 20, No. 30, No. 40 and No. 50 hydraulic supports 8 on the working face, wherein the monitoring drill holes are positioned 2-3 m above the tail beam of the hydraulic supports 8, 6 sleeves are arranged in the monitoring drill holes, a bundle pipe single tube is inserted into each sleeve, and the CO gas on the upper parts of the hydraulic supports 8 is monitored.

(6) And (3) inhibiting the oxidation of float coal on the upper part of the bracket: in this embodiment, when the CO gas in the upper part of the hydraulic support 8 No. 18 and No. 20 on the side of the face transportation gate 2 exceeds 100ppm, it indicates that the float coal in the upper part of the hydraulic support 8 has started to generate heat by oxidation, and measures must be taken immediately to suppress the oxidation of the float coal in the upper part of the hydraulic support 8, and the measures are: firstly, a target nitrogen injection hole is drilled at the frame joint of the No. 18 and No. 20 hydraulic support 8 or the upper part of the hydraulic support 8, the target nitrogen injection hole is positioned 3-6 m behind the tail beam of the support of the hydraulic support 8 and is 2-3 m higher than the coal bed bottom plate, and a sleeve pipe with the diameter of 50mm is arranged in the target nitrogen injection hole. Injecting nitrogen gas into target nitrogen injection holes at the upper part of the hydraulic support 8 through nitrogen injection branch pipes, wherein the nitrogen injection flow of each target nitrogen injection hole is 200m³H, two boreholes totaling 400m³And/h, until the CO gas concentration at the upper part of the hydraulic support 8 is less than 24 ppm. Respectively 1 water injection hole is drilled on the upper parts of No. 18 and No. 20 hydraulic supports 8, a sleeve pipe with the diameter of phi 50mm is arranged in the lower part of the water injection hole, the water injection hole is positioned at 3-5 m above the hydraulic supports 8, water is injected into the upper parts of the hydraulic supports 8 through the sleeve pipe in the water injection hole for cooling, and the water injection flow is 20m³And h, if the temperature of water flowing down from the upper part of the hydraulic support 8 is higher than the normal temperature during water injection, the water is injected until the temperature of the water is reduced to the normal temperature.

(7) The intermittent gas drainage measures of the working face air chamber and the buried pipe are as follows: during the working face is removed from the rack, because the gas emission amount of the working face is small due to non-production, in order to reduce air leakage of the goaf, during the stop production of the working face, as long as the gas of the working face does not exceed the limit, the gas drainage of the working face gas chamber and the goaf buried pipe is stopped.

In the present embodiment, the hydraulic brackets 8 No. 10, 18, 20, 30, 40, or 50 are illustrative, and the present invention is not limited thereto, and may be adjusted according to actual needs. In some embodiments, the parameters of the nitrogen injection amount, the water injection amount and the reduction amount of the air volume of the working face can be adjusted according to actual needs.

In conclusion, the nitrogen injection fire protection device and the measures of the goaf during the fully mechanized mining face withdrawal period have the following advantages: the nitrogen injection treatment is carried out on the inside of the float coal by arranging the nitrogen making machine and the pre-embedded nitrogen injection buried pipe in the transportation crossheading of the working face goaf, the monitoring of the oxidation of the float coal on the upper part of the bracket is enhanced by the pre-embedded beam pipe monitoring system in the return air crossheading, the measures of drilling, injecting nitrogen and injecting water are carried out on the position where CO gas exceeds the standard, the measures of stopping the leakage of the rake plugging material, reducing the air intake of the working face and the like are matched, the problems of the CO gas exceeding the standard and the oxidation of the float coal in the working face goaf can be effectively inhibited, the problems of the nature and the like of the float coal in the area are well solved, and the production safety of the working face goaf is ensured.

The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.