CN110685728A - Coal seam goaf gas and coal spontaneous combustion cooperative control method - Google Patents
Coal seam goaf gas and coal spontaneous combustion cooperative control method Download PDFInfo
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- CN110685728A CN110685728A CN201911152741.0A CN201911152741A CN110685728A CN 110685728 A CN110685728 A CN 110685728A CN 201911152741 A CN201911152741 A CN 201911152741A CN 110685728 A CN110685728 A CN 110685728A
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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
- E21F5/00—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
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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
- E21F5/00—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
- E21F5/08—Rock dusting of mines; Depositing other protective substances
Abstract
The invention discloses a method for preventing and treating gas and coal spontaneous combustion in a very close range easy spontaneous combustion coal layer goaf in a collaborative manner, wherein a bypass type high-position strike long drill hole is used for replacing a high-position extraction roadway and a goaf intubation tube to extract gas desorbed from a very close range coal layer and residual coal of the coal layer, so that frequent overrun of the gas of an upper corner of a working face and even a return airway is avoided; a grouting pipeline is arranged through an air inlet tunnel to continuously inject flame-retardant slurry into the goaf to block an air leakage channel, and a grouting drill hole is arranged at the rear part of the hydraulic support to continuously inject flame-retardant slurry into the goaf to condense loose coal, so that leakage blocking and cooling are realized; the coal spontaneous combustion of the goaf is prevented by continuously injecting film-forming colloid foam into the goaf by utilizing the bypass type high-position strike long drill hole which enters the deep area and stops gas extraction, a three-dimensional cooperative prevention and control system for gas and coal spontaneous combustion of the goaf is formed, and the purpose of co-treating the gas and the coal spontaneous combustion is achieved.
Description
Technical Field
The invention relates to the technical field of coal mine gas and coal spontaneous combustion prevention and control, in particular to a coal seam goaf gas and coal spontaneous combustion cooperative prevention and control method.
Background
95% of coal mining in China is underground operation, coal bed occurrence conditions are complex and changeable, multiple disasters are mutually inducement, and serious and extra-serious disaster accidents are easily caused. One of the most prominent disasters in the underground coal mine is the mutual coupling of coal spontaneous combustion and gas, and if the coal spontaneous combustion and the gas are not well controlled, the gas explosion is easily induced by the coal spontaneous combustion, so that serious casualties and economic losses are caused. Meanwhile, when the coal seam is mined in a very close distance, gas, carbon monoxide and other disaster gases in the upper coal seam goaf are easy to gush into the lower coal seam working face, and the difficulty in disaster treatment is increased.
In order to effectively prevent and control the gas and coal spontaneous combustion coupled disasters, a great deal of research is carried out by domestic and foreign scholars. However, the existing research mainly focuses on single coal seam or short-distance coal seam mining, and is related to the synergistic control of gas and coal spontaneous combustion in a goaf of an extremely-short distance easy spontaneous combustion coal seam. The coal seam with the extremely close distance is the coal seam with small coal seam distance and obvious mutual influence during mining, namely, the adjacent coal seam is positioned in the upper caving zone range along with the mining of the coal seam, the adjacent coal seam collapses along with the forward propulsion of the working face of the mining coal seam, and the goaf of the coal seam is communicated with the adjacent coal seam, so that the air leakage rate of the goaf is increased, and the possibility of spontaneous combustion of coal is increased. Meanwhile, poisonous and harmful gas adjacent to the coal seam rushes into the working face, so that the gas of the coal seam frequently exceeds the limit.
Disclosure of Invention
The invention aims to provide a coal seam goaf gas and coal spontaneous combustion cooperative control method, which aims to solve the problems in the prior art, on one hand, the migration direction of gas in an adjacent layer is changed, the gas of a working face is prevented from exceeding the limit, on the other hand, spontaneous combustion of coal in the goaf is prevented, and even gas explosion is induced; further ensuring the safe production of the mine, avoiding the malignant gas explosion accident caused by the spontaneous combustion of coal, and having very important theoretical significance and practical function for constructing the harmonious mining area.
In order to achieve the purpose, the invention provides the following scheme: the invention provides a coal seam goaf gas and coal spontaneous combustion cooperative control method, which comprises a bypass type high-position strike long drill hole, a grouting pipeline, a grouting drill hole and a deep long drill hole, wherein the bypass type high-position strike long drill hole is arranged in an auxiliary roadway of a stope face, and gas analyzed by a very close coal seam and residual coal of the coal seam is extracted; the grouting pipeline is arranged on an air inlet roadway of a stope face, and flame-retardant slurry is continuously injected into the goaf through the grouting pipeline; the grouting drill hole is arranged at the rear part of the hydraulic support, and flame-retardant slurry is continuously injected into the goaf through the grouting drill hole; and the deep long drill hole is arranged in an auxiliary roadway of a stope face, and water is continuously injected into the goaf through the deep long drill hole to form film-forming colloid foam.
Further, the coal seam in the coal seam goaf is a very close coal seam, and the coal seam interval of the very close coal seam is small.
Furthermore, the auxiliary roadway of the stope face is positioned on the outer side of the return airway of the stope face, and is 5-10 m away from the return airway horizontally and 8-10 m away from the top plate of the stope face.
Furthermore, drill sites are sequentially arranged on one side, close to a stope face, of the auxiliary roadway, the distance between the drill sites is 50m, 5 bypass type high-position strike long drill holes are constructed in each drill site, the diameter of each bypass type high-position strike long drill hole is 113mm, the drill holes are constructed in the strike direction, the horizontal distance between the final hole of each drill hole and the stope face is 8m, 16m, 24m, 32m and 40m, and the horizontal distance between the final hole of each drill hole and the stope face is 8-10 m.
Further, when the stope face is pushed to a position 25m away from the drill site, opening the bypass type high-position strike long drill hole in the drill site to start gas extraction, and closing the bypass type high-position strike long drill hole in the previous drill site, wherein only one drill hole in the drill site is extracted; injecting water into the goaf by using a bypass type high-position-oriented long drilling hole in the drill site which enters the goaf to form film-forming colloid foam while gas extraction is carried out on the new drill site; the water injection film-forming colloid foam drilling field and the gas extraction drilling field are separated by a drilling field with the distance of 100 m.
Further, the slip casting pipeline is a seamless round steel pipe with the diameter of 150 mm.
Furthermore, 1 grouting drill hole is arranged at the position close to the air inlet lane at the interval of 2 or 3 hydraulic supports, the inclination angle of the grouting drill hole and the horizontal line is 0-10 degrees, the depth is 5-8 m, and the diameter of the drill hole is 50 mm.
Furthermore, the flame-retardant slurry is a non-combustible cement foam material, the main components of the flame-retardant slurry are portland cement and a cement foaming agent, the foaming times are 8-10 times, the setting time is 30-40 minutes, the compressive strength is greater than 1.5MPa, and the gas pressure of 15KPa can be blocked.
Furthermore, the water film-forming colloid foam mainly comprises water, a foaming agent and a gelling agent, has the foaming ratio of more than or equal to 20 times, has the viscosity of not more than 1000mPa & s in a flowing state, can form a layer of compact film on the surface of the foam after standing for 48 hours, and has no dehydration phenomenon in 7 days.
Compared with the prior art, the invention has the following technical effects:
the method for preventing and treating the gas and the coal spontaneous combustion in the goaf of the extremely-close easy-spontaneous-combustion coal bed provided by the invention utilizes the bypass type high-position strike long drill hole to replace a high-position extraction roadway and a goaf intubation tube to extract the gas analyzed by the extremely-close coal bed and the residual coal of the coal bed, avoids frequent overrun of the gas of an upper corner and even a return airway during the mining of a return mining working face, and simultaneously avoids the cost of constructing the high-position extraction roadway and reduces the complicated process of constructing the goaf intubation tube. The flame-retardant slurry is continuously injected into the goaf by arranging a grouting pipeline on the air inlet lane of the stoping working face, an air leakage channel at the corner of the air inlet lane is blocked, air leakage to the goaf is inhibited, and the oxidation zone range of the goaf is shortened. The rear part of the hydraulic support is provided with the grouting drill hole to continuously inject flame-retardant slurry into the goaf, so that loose coal in the goaf is condensed, air leakage cracks are blocked, air leakage to the goaf is reduced, and meanwhile, the flame-retardant slurry has the heat absorption and cooling effects. By utilizing the bypass type high-position trend long drilling hole water injection film-forming colloid foam which enters a deep region and stops gas extraction, and utilizing the characteristics of spreading, covering and accumulating of the water film-forming colloid foam, the aims of wrapping residual coal, blocking coal oxygen contact and preventing coal spontaneous combustion are fulfilled; meanwhile, the water film-forming colloid foam forms a layer of compact film on the surface of the coal body, and the gas emission in the goaf can be effectively inhibited for a long time.
By the cooperative control method, the purpose of co-controlling the spontaneous combustion of the gas and the coal in the goaf of the coal bed easy to spontaneously combust in a very close distance is achieved, the production efficiency of the working face is improved, and the safety production of a coal mine is guaranteed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a general schematic view (top view) of the present invention;
FIG. 2 is a schematic (side view) of a very close coal seam and by-pass high strike long drill placement;
FIG. 3 is a schematic view (top view) of a bypass type high-position strike long drilling and grouting pipe arrangement;
FIG. 4 is a schematic illustration (side view) of a grouting drilling arrangement;
the coal mining method comprises the following steps of 1 air inlet lane, 2 air return lane, 3 auxiliary lanes, 4 stope face, 5 goaf, 6 drill site, 7 bypass type high-position strike long drill hole, 8 coal seam, 9 extremely close coal seam, 10 grouting pipeline, 11 hydraulic support and 12 grouting drill hole.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a coal seam goaf gas and coal spontaneous combustion cooperative control method, which aims to solve the problems in the prior art, on one hand, the migration direction of gas in an adjacent layer is changed, the gas of a working face is prevented from exceeding the limit, on the other hand, spontaneous combustion of coal in the goaf is prevented, and even gas explosion is induced; further ensuring the safe production of the mine, avoiding the malignant gas explosion accident caused by the spontaneous combustion of coal, and having very important theoretical significance and practical function for constructing the harmonious mining area.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1-4, the invention provides a method for preventing and treating spontaneous combustion of gas and coal in a goaf of a very close-range easy spontaneous combustion coal seam, which mainly aims at an overlying adjacent coal seam of a mined coal seam, wherein the mined coal seam and the overlying adjacent coal seam both belong to high-gas easy spontaneous combustion coal seams, and the overlying adjacent coal seam is located in a mining caving zone range of the coal seam.
The method for preventing and treating the gas and the coal spontaneous combustion in the goaf of the extremely-close easy-spontaneous-combustion coal seam comprises a bypass type high-position strike long drill hole 7, a grouting pipeline 10, a grouting drill hole 12 and a deep long drill hole, wherein the bypass type high-position strike long drill hole 7 is arranged in an auxiliary roadway 3, and the gas analyzed by the extremely-close coal seam 9 and the residual coal of the coal seam 8 is extracted; the air inlet lane 1 is provided with a grouting pipeline 10 for continuously injecting flame-retardant slurry into the gob 5 to block a crack channel and prevent air leakage to the gob 5; the rear part of the hydraulic support 11 is provided with a grouting drill hole 12 for continuously injecting flame-retardant slurry into the gob 5, so that loose coal bodies are condensed, and plugging and cooling are realized; the self-ignition of the residual coal is prevented by injecting film-forming colloid foam into the goaf 5 through the bypass type high-position strike long drill hole 7 which enters the deep region and stops gas extraction.
The coal seam 9 in the extremely close range means that the coal seam 9 in the extremely close range collapses along with the forward advance of the stope face 4 and is positioned in the caving zone range of the coal seam 8. The auxiliary lane 3 is located on the outer side of the return airway 2, is 5-10 m away from the return airway 2 in horizontal distance, and is 8-10 m away from a top plate of a mined coal bed 8. 1 drill site 6 is arranged in the auxiliary roadway 3 every 50m, 5 bypass type high-position strike long drill holes 7 are arranged in each drill site 6, the hole diameters of the drill holes are 113mm, the final holes of the bypass type high-position strike long drill holes 7 are located above the stope face 4, the horizontal distances from the drill sites 2 to the stope face are 8m, 16m, 24m, 32m and 40m respectively, the distances from the top plate of the stope face 4 to 10m, the hole opening negative pressure is not lower than 13KPa, and the drill holes 7 constructed in two adjacent drill sites 6 are stubble-pressed by 10 m.
And arranging a deep long drill hole in the auxiliary roadway 3 of the stope face to continuously inject film-forming colloid foam into the gob 5, namely, continuously injecting the film-forming colloid foam into the gob 5 by utilizing a bypass type high-position strike long drill hole 7 which enters a deep region and stops gas extraction. And when the stope face 4 advances to a position 25m away from the drill site, opening the bypass high-position strike long drill hole 7 in the drill site to start gas extraction, and simultaneously closing the bypass high-position strike long drill hole 7 in the previous drill site 6, as shown in fig. 3, when the stope face 4 advances to a position 25m before the drill site 607, opening the bypass high-position strike long drill hole 707 in the drill site 607 to start gas extraction, and simultaneously closing the bypass high-position strike long drill hole 708 in the previous drill site 608, and so on. And pumping is carried out by drilling holes in one and only one drilling field 6. And (3) injecting water into the goaf to form film-forming colloid foam by utilizing the bypass type high-position strike long drill hole 7 in the drill site 6 which enters the goaf while gas extraction is carried out on the new drill site. The water injection film-forming colloid foam drilling field and the gas extraction drilling field are separated by a drilling field with the distance of 100 m.
Arranging a grouting pipeline 10 in the air intake tunnel 1 to continuously inject flame-retardant slurry into the gob 5, wherein the diameter of the grouting pipeline 10 is 150mm, and the grouting pipeline 10 is dragged forwards along with the forward propulsion of the stope face 4, so that the outlet of the grouting pipeline 10 is always positioned 5-8 m away from the corner in the gob 5, and the continuous injection of the flame-retardant slurry into the gob 5 is realized. In the range of 20-30 hydraulic supports 11 close to the air intake lane 1, 1 grouting drill hole 12 is arranged at the position of every 2 or 3 hydraulic supports 11 at intervals to continuously inject flame retardant slurry into the gob 5, the inclination angle of the grouting drill hole 12 and the horizontal line is 0-10 degrees, the depth is 5-8 m, the diameter of the drill hole is 50mm, and the continuous injection of the flame retardant slurry into the gob 5 is realized. The flame-retardant slurry is a non-combustible cement foam material, has the characteristics of high foaming times (8-10 times), short solidification time (30-40 minutes), high compressive strength (more than 1.5MPa), good plugging property (capable of plugging 15KPa gas pressure) and the like, and can effectively plug an air leakage channel of the goaf 5 and shorten the range of an oxidation zone. Continuously injecting water into the goaf 5 to form film-forming colloid foam by utilizing the bypass type high-position strike long drill hole 7 which enters the deep region and stops gas extraction, opening the bypass type high-position strike long drill hole 7 in the drill site 6 to start gas extraction when the stope face 4 is pushed to 25m in front of one of the drill sites 6, simultaneously closing the bypass type high-position strike long drill hole 7 in the previous drill site 6, performing gas extraction by using only one drill site, and opening the bypass type high-position strike long drill hole 704 in the drill site 604 to start gas extraction and simultaneously closing the bypass type high-position strike long drill hole 705 in the drill site 605 when the stope face 4 is pushed to 25m in front of the drill site 604. And (3) injecting water into the gob 5 to form film-forming colloid foam by using the bypass high-position strike long drill hole 706 in the drill site 606 entering the gob 5 while performing gas extraction by using the bypass high-position strike long drill hole 704 in the drill site 604. The water injection film-forming colloid foam and the extraction gas drill site are separated by a drill site, and the distance is 100 m. The water film-forming colloid foam has the functions of high expansion (more than 20 times), good flow diffusivity (the viscosity is not higher than 1000mPa & s in a flow state), strong stability (no dehydration exists for 7 days), film-forming on the surface (a layer of compact film is formed on the surface after 48 hours), and the like, can durably and effectively cover the coal body, and achieves the purposes of isolating oxygen and preventing the spontaneous combustion of the coal; and simultaneously, the residual coal gas in the goaf 5 is effectively inhibited from flowing outwards.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (9)
1. A cooperative prevention and control method for gas and coal spontaneous combustion in a coal seam goaf is characterized by comprising the following steps: the system comprises a bypass type high-position strike long drill hole, a grouting pipeline, a grouting drill hole and a deep long drill hole, wherein the bypass type high-position strike long drill hole is arranged in an auxiliary roadway of a stope face, and gas analyzed by a very-close coal seam and residual coal of the coal seam is extracted; the grouting pipeline is arranged on an air inlet roadway of a stope face, and flame-retardant slurry is continuously injected into the goaf through the grouting pipeline; the grouting drill hole is arranged at the rear part of the hydraulic support, and flame-retardant slurry is continuously injected into the goaf through the grouting drill hole; and the deep long drill hole is arranged in an auxiliary roadway of a stope face, and water is continuously injected into the goaf through the deep long drill hole to form film-forming colloid foam.
2. The coal seam gob gas and coal spontaneous combustion cooperative control method according to claim 1, characterized in that: the coal seam in the coal seam goaf is a very close coal seam, and the coal seam interval of the very close coal seam is small.
3. The coal seam gob gas and coal spontaneous combustion cooperative control method according to claim 1, characterized in that: the auxiliary roadway of the stope face is positioned on the outer side of the return airway of the stope face, and is horizontally 5-10 m away from the return airway and 8-10 m away from the top plate of the stope face.
4. The coal seam gob gas and coal spontaneous combustion cooperative control method according to claim 1, characterized in that: and sequentially arranging drill sites on one side of the auxiliary roadway close to the stope face, wherein the distance between the drill sites is 50m, 5 bypass type high-position strike long drill holes are constructed in each drill site, the diameter of each bypass type high-position strike long drill hole is 113mm, the drill holes are constructed in the strike direction, the horizontal distances from the final hole of each drill hole to the return airway are 8m, 16m, 24m, 32m and 40m respectively, and the horizontal distance from the final hole to the stope face top plate is 8-10 m.
5. The cooperative prevention and control method for gas and coal spontaneous combustion in the coal seam gob area according to claim 4, is characterized in that: when the stope face is pushed to a position 25m away from the drill site, opening the bypass type high-position strike long drill hole in the drill site to start gas extraction, and closing the bypass type high-position strike long drill hole in the previous drill site, wherein only one drill hole in the drill site is extracted; injecting water into the goaf by using a bypass type high-position-oriented long drilling hole in the drill site which enters the goaf to form film-forming colloid foam while gas extraction is carried out on the new drill site; the water injection film-forming colloid foam drilling field and the gas extraction drilling field are separated by a drilling field with the distance of 100 m.
6. The coal seam gob gas and coal spontaneous combustion cooperative control method according to claim 1, characterized in that: the grouting pipeline is a seamless round steel pipe with the diameter of 150 mm.
7. The coal seam gob gas and coal spontaneous combustion cooperative control method according to claim 1, characterized in that: 1 grouting drill hole is arranged at the position close to the air inlet lane at the interval of 2 or 3 hydraulic supports, the inclination angle of the grouting drill hole and the horizontal line is 0-10 degrees, the depth is 5-8 m, and the diameter of the drill hole is 50 mm.
8. The coal seam gob gas and coal spontaneous combustion cooperative control method according to claim 1, characterized in that: the flame-retardant slurry is a non-combustible cement foam material, the main components of the flame-retardant slurry are portland cement and a cement foaming agent, the foaming times are 8-10 times, the setting time is 30-40 minutes, the compressive strength is greater than 1.5MPa, and the gas pressure of 15KPa can be blocked.
9. The coal seam gob gas and coal spontaneous combustion cooperative control method according to claim 1, characterized in that: the water film-forming colloid foam mainly comprises water, a foaming agent and a gelling agent, has a foaming multiple of more than or equal to 20 times, has a viscosity of not more than 1000mPa & s in a flowing state, can form a layer of compact film on the surface of the foam after 48 hours in a standing state, and has no dehydration phenomenon in 7 days.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911152741.0A CN110685728A (en) | 2019-11-22 | 2019-11-22 | Coal seam goaf gas and coal spontaneous combustion cooperative control method |
| ZA2020/06875A ZA202006875B (en) | 2019-11-22 | 2020-11-04 | Method for coordinated prevention of spontaneous coal combustion and gas explosion in coal goaf |
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| CN201911152741.0A CN110685728A (en) | 2019-11-22 | 2019-11-22 | Coal seam goaf gas and coal spontaneous combustion cooperative control method |
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| CN110685728A true CN110685728A (en) | 2020-01-14 |
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| CN201911152741.0A Pending CN110685728A (en) | 2019-11-22 | 2019-11-22 | Coal seam goaf gas and coal spontaneous combustion cooperative control method |
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| ZA (1) | ZA202006875B (en) |
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| CN111779534A (en) * | 2020-07-03 | 2020-10-16 | 河南理工大学 | Top grouting and roof contacting filling method by upward grouting column method |
| CN113236336A (en) * | 2021-06-15 | 2021-08-10 | 国能乌海能源五虎山矿业有限责任公司 | Green energy-saving coal seam water injection and grouting cooperative disaster prevention system and method |
| CN113236344A (en) * | 2021-06-11 | 2021-08-10 | 煤炭科学技术研究院有限公司 | Device and method for preventing spontaneous combustion of coal seam by injecting nitrogen gas and mixing with flame retardant through displacement and pumping promotion |
| CN113567061A (en) * | 2021-07-23 | 2021-10-29 | 安徽理工大学 | Method for detecting group air leakage of close-range coal seam mining goaf |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111779534A (en) * | 2020-07-03 | 2020-10-16 | 河南理工大学 | Top grouting and roof contacting filling method by upward grouting column method |
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| CN113236344A (en) * | 2021-06-11 | 2021-08-10 | 煤炭科学技术研究院有限公司 | Device and method for preventing spontaneous combustion of coal seam by injecting nitrogen gas and mixing with flame retardant through displacement and pumping promotion |
| CN113236344B (en) * | 2021-06-11 | 2023-10-13 | 煤炭科学技术研究院有限公司 | Device and method for preventing and controlling spontaneous combustion of coal seam by injecting nitrogen and mixing flame retardant for displacement pumping promotion |
| CN113236336A (en) * | 2021-06-15 | 2021-08-10 | 国能乌海能源五虎山矿业有限责任公司 | Green energy-saving coal seam water injection and grouting cooperative disaster prevention system and method |
| CN113567061A (en) * | 2021-07-23 | 2021-10-29 | 安徽理工大学 | Method for detecting group air leakage of close-range coal seam mining goaf |
| CN113567061B (en) * | 2021-07-23 | 2024-01-12 | 安徽理工大学 | Air leakage detection method for goaf group in close-range coal seam mining |
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| Publication number | Publication date |
|---|---|
| ZA202006875B (en) | 2022-07-27 |
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