Coal spontaneous combustion disaster control method for coal roadway top-coal-caving area of underground coal mine

Abstract

The invention discloses a coal spontaneous combustion disaster treatment method for a coal mine underground coal roadway top-coal-caving area. The treatment method comprises the following steps: firstly, determining a natural ignition area of a coal roadway top-caving area by adopting a detection technology, fixing a fireproof carbon sequestration material at the top of a roadway through a construction anchor rod, and covering the ignition area and a range 5m before and after the ignition area along the trend of the roadway; then, water is evenly sprayed to the surface of the fireproof carbon sequestration material through an underground water pipe till a lower fabric layer and a lower filling layer of the fireproof carbon sequestration material are completely wetted, and after the fireproof carbon sequestration material is condensed and formed, drilling is conducted in the top caving spontaneous ignition area; and finally, liquid CO2 is poured into the top-coal-caving area through the drill hole to rapidly cool the high-temperature coal body, after the ignition area is extinguished, the inorganic carbon sequestration slurry material continues to be poured to completely fill the top-coal-caving area, and on the basis, power plant flue gas is further injected to inert residual coal in the top-coal-caving area. The filling strength and compactness are improved through the mineralization reaction of the smoke CO2 and the inorganic carbon sequestration slurry material, air leakage of a top-coal-caving area is eradicated, and spontaneous ignition disasters of residual coal are restrained.

Description

Technical Field

[0001] The present invention relates to the technical field of coal spontaneous combustion control in coal mines, and particularly relates to a method for controlling coal spontaneous combustion disasters in high-goaf areas of coal roadways in coal mines. Background Art

[0002] With the progress of mining technologies and equipment, the fully-mechanized caving mining method has been widely applied, and roadways are usually arranged along the coal seam floor. Due to the influence of geological changes and structures, high-goaf areas will be formed in these roadways; in the high-goaf areas, the coal body is usually in a fragmented state, and when the air leakage velocity and heat accumulation conditions are appropriate, spontaneous combustion is likely to occur, resulting in the high-goaf area becoming one of the areas where coal spontaneous combustion is most likely to occur in coal mines. According to the pore and fracture distribution state, looseness degree, and caving degree, etc. of the high-goaf area, it can be divided into a broken zone, a separated zone, and a fracture subsidence zone from bottom to top. The spontaneous combustion of the remaining coal in the high-goaf area is a process involving the interaction of heat transfer and mass transfer, mainly occurring at the junction of the broken zone and the separated zone.

[0003] Currently, the technical measures for controlling spontaneous combustion of residual coal in high-goaf areas include water injection, grouting, nitrogen injection, foam injection, inorganic or organic filling materials, etc. However, methods such as water injection, grouting, and foam injection are prone to flow away along the fractured fissures, and nitrogen injection is prone to escape with the wind, and cannot be effectively retained in the high-temperature coal spontaneous combustion area for a long time; injecting inorganic or organic filling materials is prone to pipeline blockage and pollutes the underground working environment. For example, CN104402506A proposes a fire isolation and filling material for caving areas in coal mines. By means of pressure pumping and filling, the fire prevention filling material is injected into the high-goaf area, thereby increasing the stability of the high-goaf area and solving disasters such as gas accumulation and coal spontaneous combustion. The above invention controls coal spontaneous combustion disasters by injecting filling materials into the high-goaf area, but does not consider that the materials are extremely easy to be lost and wasted from the fractured area of the high-goaf area during the filling process; at the same time, after injecting a large amount of materials into the suspended high-goaf area, under the action of extrusion and self-weight of the filling materials, the high-goaf area may further collapse, generating larger air leakage fissures and further aggravating the coal spontaneous combustion disaster. In addition, the main goal of this invention is "fire prevention", and it is difficult to quickly extinguish the fire and cool down the high-goaf area where spontaneous combustion has occurred. In order to control the spontaneous combustion of coal in the high-goaf area of the coal roadway in the coal mine, the literature "Application of Comprehensive Fire Prevention and Extinguishment Technology in the Fire of High-Goaf Roadways" (DOI: 10.13347 / j.cnki.mkaq.2019.06.020) proposes a comprehensive fire extinguishing technology plan for the high-goaf area. First, a large amount of cold water is injected into the high-goaf area to prevent the expansion of disasters; second, the fractured zone near the high-goaf area of the roadway is shotcreted; finally, boreholes are constructed to detect the scope of the fire area, and the temperature of the coal body is reduced by injecting water through the boreholes, and the fractured coal body is covered by grouting to extinguish the spontaneous combustion of coal in the high-goaf area. The above invention uses water injection into the high-goaf area to extinguish the fire and cool down, but does not consider that the water injection process is easy to flow away and it is difficult to stay in it for a long time to wet and cool the coal body. Therefore, how to effectively retain the cooling medium in the high-goaf area to achieve the effects of rapid fire extinguishing and oxygen isolation is the key to controlling the spontaneous combustion of coal in the high-goaf area of the coal roadway in the coal mine. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for controlling the spontaneous combustion disaster of coal in the high-goaf area of the coal roadway in the coal mine, which has the advantages of good plugging and prevention and control effects, significant supporting effect, long-term prevention of leakage of inert gases such as CO 2 etc., and obvious effect of filling the high-goaf area, and can achieve efficient prevention and control of the spontaneous combustion disaster in the high-goaf area of the coal mine.

[0005] To achieve the above purpose, the present invention provides a method for controlling the spontaneous combustion disaster of coal in the high-goaf area of the coal roadway in the coal mine, and the specific steps are as follows:

[0006] Step 1), using detection technology to determine the natural ignition area of ​​coal in the high-risk area of ​​the coal roadway, fixing the fire-proof carbon-fixing material on the top of the roadway by construction anchor rods, covering the ignition area and the range of 5m before and after along the direction of the roadway, ensuring that the upper fabric layer of the fire-proof carbon-fixing material is close to the roof; the fire-proof carbon-fixing material has a total of five layers, from top to bottom, an upper fabric layer, an upper filling layer, an intermediate fabric layer, a lower filling layer, and a lower fabric layer, wherein the upper fabric layer, the intermediate fabric layer, and the lower fabric layer are all highly flame-retardant polyphenylene sulfide fibers; the internal filling of the upper filling layer is CO 2 The composite adsorbent material is prepared by fully dry mixing sodium silicate powder and calcium oxide powder in a mass ratio of 1:1; the internal filler of the lower filling layer is sulphoaluminate rapid hardening cement;

[0007] Step 2), using a downhole water pipe to evenly spray water onto the surface of the fireproof carbon-fixing material until the lower fabric layer and the lower filling layer of the fireproof carbon-fixing material are completely wetted;

[0008] Step 3), after the fireproof carbon-fixing material is allowed to stand for 30 minutes and solidified, a hole is drilled toward the high spontaneous combustion area, and the final hole position is located at the connection position between the crushing area and the separation area;

[0009] Step 4) Inject liquid CO into the spontaneous combustion area of ​​the high-risk coal through drilling holes. 2 , quickly cool down the high-temperature coal in the high-risk area;

[0010] Step 5), using detection technology to determine whether the high-temperature points in the spontaneous combustion area of ​​the high-risk area of ​​the coal roadway are completely eliminated;

[0011] Step 6), if there are still high temperature spots, continue to inject liquid CO 2 Continue to extinguish the fire and cool down until the high temperature points are eliminated;

[0012] Step 7), if it is determined that the ignition area is extinguished, continue to inject inorganic carbon-fixing slurry material into the ignition area to completely fill the high-ignition area;

[0013] Step 8), further injecting power plant flue gas into the high-risk area after filling to inertify the coal in the high-risk area; at the same time, CO in the flue gas 2 After reacting with the inorganic carbon-fixing slurry material, the filling strength and density are increased, air leakage in high-risk areas is eliminated, and the natural fire disaster of coal residue is curbed.

[0014] Preferably, the detection technology in step 1) and step 5) includes a combination of one or more of infrared thermal imaging detection method, borehole temperature measurement method, and gas detection method.

[0015] Preferably, the inorganic carbon-fixing slurry material in step 7) is prepared with 425 type ordinary Portland cement, water glass and water as raw materials, in a mass ratio of 33-40 parts, 10-12 parts and 48-57 parts, after stirring and mixing thoroughly; wherein the water glass modulus ranges from 1.5 to 2.0.

[0016] Preferably, in step 8), the flue gas temperature of the power plant is lower than 25°C.

[0017] Preferably, in step 1), the particle size of the sodium silicate powder and the calcium oxide powder is 0.1-0.5 mm.

[0018] Preferably, in step 1), the thicknesses of the upper fabric layer, the middle fabric layer and the lower fabric layer of the fireproof carbon fixing material are respectively 1-2 mm, the filling thickness of the upper filling layer is 2-4 mm, and the filling thickness of the lower filling layer is 3-5 mm.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The method for controlling the spontaneous combustion disaster of coal in the high-risk area of ​​underground coal tunnels proposed in this method can achieve effective support and gas blocking effects in the high-risk area by using a new type of fire-proof carbon-fixing material; the fire-proof carbon-fixing material is composed of a five-layer structure of an upper fabric layer, an upper filling layer, an intermediate fabric layer, a lower filling layer, and a lower fabric layer. The upper fabric layer, the intermediate fabric layer, and the lower fabric layer are all highly flame-retardant polyphenylene sulfide fibers with a thickness of 1mm; the upper filling layer is between the intermediate fabric layer and the upper fabric layer, and its internal filling is CO 2 The composite adsorbent material has a filling thickness of 2.5mm; the lower filling layer is between the lower fabric layer and the middle fabric layer, and its internal filling material is sulphoaluminate rapid hardening cement with a filling thickness of 4mm. During the on-site use, it is fixed and covered on the roof of the high-risk area by anchor rods. Since the fabric material is highly flame-retardant polyphenylene sulfide fiber, it has good fracture strength and good toughness, which can not only prevent the coal from collapsing and injuring people in the high-risk area, but also can control the spontaneous combustion of coal in the high-risk area while removing liquid CO 2 It can effectively stay in the high-risk area to prevent leakage, achieve the effect of rapid fire extinguishing and inerting suffocation, and quickly eliminate the high-temperature points of spontaneous combustion of the remaining coal in the high-risk area.

[0021] 2. The method for controlling spontaneous combustion disasters in high-risk areas of underground coal tunnels proposed in the present invention uses the sulphoaluminate quick-hardening cement in the lower filling layer of the fireproof carbon-fixing material, which has the characteristic of high early strength, and can enable the fireproof carbon-fixing material to obtain sufficient hardness and strength in a relatively short time. When preventing and controlling spontaneous combustion disasters in high-risk areas on site, water is sprayed on the surface of the fireproof carbon-fixing material using an underground water pipe. The quick-hardening cement, with its own rapid solidification characteristics, allows the lower filling layer of the fireproof carbon-fixing material to solidify in a short time to form a cement wall, providing good structural support, completely covering the high-risk area, achieving the effect of oxygen isolation and heat insulation, and realizing long-term plugging and complete coverage of the high-risk area. In addition, the CO used in the upper filling layer of the fireproof carbon-fixing material 2 The composite adsorbent material is mainly made of sodium silicate powder and calcium oxide powder, which has the ability to absorb carbon dioxide. 2 After being injected into the high-gassing area, it expands rapidly, absorbs heat, and gasifies to form a large amount of CO 2 Gas, and the sodium silicate powder and calcium oxide in this composite material will react with CO under the wetting effect of the water in the lower filling layer. 2 reacts and absorbs it, effectively blocking CO 2 The escape of carbon dioxide effectively ensures the stability of the gas environment in the spontaneous combustion area of ​​the coal tunnel with high carbon emissions, reduces carbon emissions, and achieves the effect of carbon reduction. In this way, it not only ensures the stability and sealing of the fireproof carbon-fixing material, but also makes the composite material more stable in absorbing CO 2 After that, its strength is improved, and CO 2 Composite adsorbent materials to fix carbon and eliminate CO in tunnels 2 The accumulation effect is significant, avoiding harm to tunnel workers.

[0022] 3. The method for controlling the spontaneous combustion disaster of coal in the high-risk area of ​​underground coal tunnel proposed by the present invention uses drilling holes to inject liquid CO into the spontaneous combustion area of ​​the high-risk area. 2 , can be achieved with the help of liquid CO 2 The low-temperature cooling capacity (between -56.4℃ and -78℃) of the coal body absorbs a large amount of heat from the spontaneous combustion area through vaporization and expansion, which rapidly reduces the temperature of the coal body and lowers the temperature of the coal body to below the ignition point, effectively inhibiting the oxidation reaction of the coal body in the high-gassing area. 2 As an inert gas, after being injected into the spontaneous combustion area of ​​coal in the high-risk area of ​​the coal roadway, liquid CO 2 Diffusion during rapid vaporization in the ignition area can significantly reduce the oxygen concentration in the high-gassing area, thereby causing the gas environment in the high-gassing area to reach an inert state, thus achieving effective prevention and control of the natural ignition disaster of coal in the high-gassing area of ​​the coal tunnel. In addition, since the fire-proof carbon-fixing material is fixed in advance at the high-gassing area, the CO in the filling layer above it 2The composite adsorbent material can effectively absorb part of the CO that escapes from the high-gassing area. 2 Gas, to achieve pollution-free natural fire disaster disposal.

[0023] 4. The method for controlling spontaneous combustion disasters in high-risk areas of underground coal tunnels proposed by the present invention uses inorganic carbon-fixing slurry materials to fill the high-risk areas. The inorganic carbon-fixing slurry is prepared with 425 type ordinary silicate cement, water glass and water as raw materials. Since liquid CO was injected into the high-risk areas in the early stage, 2 A large amount of CO will be retained in the high-risk area. 2 Gas; when the high-capacity area is filled with inorganic carbon-fixing slurry materials in the later stage, the slurry contains water glass components that can react with CO 2 The reaction is carried out to achieve the effect of carbon fixation and improving the strength of the filling material, which is equivalent to reinforcing the area, achieving more stringent filling of the voids and cracks inside the high-risk area, improving the overall structural strength of the high-risk area, and preventing the subsequent collapse of the high-risk area due to factors such as roof pressure, thereby ensuring the structural integrity of the underground tunnels, and further improving the sealing and leak-proof properties of the treatment, strengthening the ability of heat insulation and oxygen isolation, and creating safe and reliable spatial conditions for subsequent mining, ventilation and other operations.

[0024] 5. The method for controlling spontaneous combustion disasters of coal in high-risk areas of underground coal lanes proposed in the present invention further utilizes the flue gas from power plants to inertize the high-risk areas after filling; since the flue gas from power plants contains a large amount of inert gas components such as carbon dioxide and nitrogen, they are injected into the high-risk areas to inertify the residual coal, thereby realizing the secondary utilization of the flue gas from power plants and improving the utilization rate of resources. On the one hand, it reduces the increase in greenhouse gases and high carbon emissions caused by flue gas emissions from power plants, and on the other hand, it also reduces the overall cost of controlling spontaneous combustion disasters of residual coal in high-risk areas. The flue gas from power plants has good fluidity and diffusivity. Injecting the flue gas from power plants into the high-risk areas can further reduce the internal pressure of the high-risk areas, achieve all-round coverage and inertization of the residual coal in the high-risk areas, and prevent oxygen from entering the pores and cracks inside the high-risk areas. In addition, the upper filling layer of the fireproof carbon-fixing material and the subsequently injected power plant flue gas CO 2 It can also further react to enhance the mechanical strength of the upper filling layer and increase the structural stability of the fireproof carbon-fixing material; the inorganic carbon-fixing slurry material previously injected into the high-risk area reacts with the flue gas CO 2 After the mineralization reaction occurs, assistants further improve their density and mechanical strength, and ultimately enhance the stability and filling density of high-risk areas, effectively reducing the record of natural fire disasters caused by coal residues in high-risk areas. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the embodiments.

[0026] Implementation background:

[0027] The coal seam of Ji 16-17 in a certain mine of Pingmei Coal ... 16-17 The thickness of the coal seam is between 1.5-8.3m, with an average thickness of 2.9m. There are two abnormal coal thickness areas with a thickness greater than 4m near the F4 reverse fault, with a coal thickness between 4-7.1m. The coal seam dip angle is 13°-30°, with an average of 22°. The coal seam strike is between 118°-149°, with a dip of 208°-239°. The absolute gas outburst volume is 2.4m 3 / min, relative gas outflow rate 1.2m 3 / t, spontaneous combustion level II, and the combustion period is 3 to 5 months. The geological conditions of the working face are complex, there are many faults, and excavation is difficult. Therefore, in the early stage of excavating the air tunnel and not yet through, the face ventilation was not carried out in accordance with the requirements of the operating procedures. Instead, the middle extraction tunnel was used as the return air tunnel, and the transport belt was arranged in the air intake tunnel. At the same time, the outer section of the air tunnel continued to be excavated in order to connect with the inner section. When the outer section of the air tunnel of the coal tunnel was constructed until November 15, 2021, it was detected that the coal seam above the roof of area A was loose and formed a high-risk area. After sampling and analysis, it was found that the CO volume fraction in the high-risk area reached 1520ppm, indicating that natural combustion of the coal body occurred in the high-risk area of ​​this area. If the natural combustion disaster of coal in the high-risk area further develops and spreads, it is very likely to cause serious thermal dynamic disasters such as coal spontaneous combustion and gas explosion.

[0028] In order to effectively prevent and control the spontaneous combustion disaster of coal in the high-risk area of ​​the wind tunnel of the coal tunnel of the working face, the mine adopts the method for controlling the spontaneous combustion disaster of coal in the high-risk area of ​​the coal tunnel in the underground coal mine proposed by the present invention, and the specific steps are as follows:

[0029] Step 1), based on the geological data of the coal mining face and the measured CO volume fraction in the high-risk area of ​​the roof of area A reaching 1520ppm, the area was determined as the target treatment area. Then, along the direction of the tunnel, the fire-proof carbon-fixing material was used to cover the spontaneous combustion area of ​​the high-risk area in area A and the 5m range behind it, and the fire-proof carbon-fixing material was fixed on the roof by anchor rods to ensure that the fabric layer on the fire-proof carbon-fixing material was close to the roof.

[0030] The fireproof carbon-fixing material in this embodiment has a five-layer structure, which is an upper fabric layer, an upper filling layer, an intermediate fabric layer, a lower filling layer, and a lower fabric layer from top to bottom, wherein the upper fabric layer, the intermediate fabric layer, and the lower fabric layer are all highly flame-retardant polyphenylene sulfide fibers; the internal filling of the upper filling layer is CO 2The composite adsorbent material is prepared by fully dry mixing sodium silicate powder and calcium oxide powder in a mass ratio of 1:1. The particle size of the sodium silicate powder and the calcium oxide powder is preferably 0.1-0.5mm; the internal filler of the lower filling layer is sulphoaluminate rapid-hardening cement. The thickness of each layer of the structure has little effect on the performance. Preferably, the thickness of the upper fabric layer, the middle fabric layer, and the lower fabric layer are 1-2mm respectively, the filling thickness of the upper filling layer is 2-4mm, and the filling thickness of the lower filling layer is 3-5mm. More preferably, the thickness of the upper fabric layer, the middle fabric layer, and the lower fabric layer are 1mm respectively, the filling thickness of the upper filling layer is 2.5mm, and the filling thickness of the lower filling layer is 4mm.

[0031] Step 2), use a downhole water pipe to evenly spray water onto the surface of the fireproof carbon-fixing material laid in area A until the lower fabric layer and the lower filling layer of the fireproof carbon-fixing material are completely wetted, so that the sulphoaluminate rapid-hardening cement of the lower filling layer quickly solidifies, and the fireproof carbon-fixing material quickly forms a flexible and compressive fireproof barrier.

[0032] Step 3), after standing for 30 minutes to allow the fireproof carbon-fixing material to solidify and take shape, fire-proof drilling holes are constructed at the spontaneous combustion area in area A. Each drilling hole can cover the spontaneous combustion area with a radius of 5m. On this basis, the actual number of drilling holes to be constructed is determined to be 10, and the final hole position is located at the connection between the crushing area and the delamination area.

[0033] Step 4) Inject liquid CO into the spontaneous combustion area of ​​the high-risk coal through drilling holes. 2 , using liquid CO 2 The rapid heat absorption characteristics of the liquid CO reduce the temperature of the coal seam and prevent the entry of oxygen, thus achieving rapid cooling of the high-temperature coal in the spontaneous combustion area of ​​the high-risk area. 2 By drilling holes to penetrate into the cracks and pore structures in the spontaneous combustion areas of the high-carbon coal, the target area is covered.

[0034] Step 5), liquid CO in each borehole 2 After the pouring is completed, infrared thermal imaging detection method, drilling temperature measurement method, gas detection method and other detection methods are used to detect whether the high-temperature spots in the high-risk area of ​​area A are completely eliminated; after detection, the high-temperature spots have been completely eliminated.

[0035] Step 6), after testing to determine that the ignition area in area A is extinguished, continue to inject inorganic carbon-fixing slurry material into the ignition area through drilling to completely fill the high-ignition area;

[0036] The inorganic carbon-fixing slurry material described in this embodiment is prepared with 425 type ordinary Portland cement, water glass and water as raw materials, in a mass ratio of 33-40 parts, 10-12 parts and 48-57 parts, after being stirred and mixed thoroughly; wherein the modulus range of the water glass is 1.5-2.0.

[0037] The slurry contains water glass components that can react with CO 2 The reaction is carried out to achieve the effect of carbon fixation and improving the strength of the filling material, which is equivalent to reinforcing the area and further achieving a denser filling of the voids and cracks inside the high-risk area, thereby improving the overall structural strength of the high-risk area.

[0038] Step 7), after the inorganic carbon-fixing slurry material is poured, the power plant flue gas is further injected into the high-gas area after filling to inertify the coal in the high-gas area, wherein the flue gas temperature should be lower than 25°C; at the same time, the CO in the flue gas 2 After reacting with inorganic carbon-fixing slurry materials, the filling strength and density are increased, air leakage in high-risk areas is eliminated, and natural fire disasters of coal residue are curbed.

[0039] Step 8), after each borehole is filled with power plant flue gas, the orifice valve is immediately closed to ensure that the borehole is sealed to prevent gas leakage and weaken the prevention and control effect. When closing the valve, conduct a comprehensive inspection of the sealing of each borehole to ensure that the sealing components such as valves and pipe connections are not loose or damaged. At the same time, record the parameters such as the filling volume, filling pressure and closing time of each borehole to form a systematic construction file for subsequent monitoring and maintenance. After closing the borehole, detect the area around the borehole to confirm that the sealing effect is good and there is no gas leakage, so as to ensure the integrity and continuity of the entire prevention and control system.

[0040] Using the method for controlling the spontaneous combustion disaster in the high-risk area of ​​coal tunnels in coal mines proposed by the invention, the fire-proof carbon-fixing material is laid, and then holes are drilled and liquid CO is injected in sequence. 2 , inorganic carbon-fixing slurry materials, power plant flue gas and other prevention and control methods have made the CO concentration in the high-risk area of ​​the wind tunnel of the coal tunnel of the working face continue to drop from 1520ppm to below 20ppm, and finally stabilized at 0ppm, indicating that the oxidation of residual coal and high-temperature hazards in the high-risk area of ​​the wind tunnel of the working face have been effectively suppressed, thereby completely eliminating the possibility of serious coal spontaneous combustion disasters in the high-risk area of ​​the working face.

[0041] The above is only a preferred implementation method of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for controlling spontaneous combustion disasters in high-risk areas of coal lanes in underground coal mines, characterized in that: The specific steps are as follows: Step 1), using detection technology to determine the natural ignition area of ​​the high-risk area of ​​the coal roadway, fixing the fire-proof carbon-fixing material on the top of the roadway by construction anchor rods, covering the ignition area and the range of 5m before and after along the direction of the roadway, to ensure that the upper fabric layer of the fire-proof carbon-fixing material is close to the roof; the fire-proof carbon-fixing material has a five-layer structure, from top to bottom, an upper fabric layer, an upper filling layer, an intermediate fabric layer, a lower filling layer, and a lower fabric layer, wherein the upper fabric layer, the intermediate fabric layer, and the lower fabric layer are all highly flame-retardant polyphenylene sulfide fibers; the internal filling material of the upper filling layer is a CO2 composite adsorbent material, which is prepared by fully dry mixing sodium silicate powder and calcium oxide powder in a mass ratio of 1:1; the internal filling material of the lower filling layer is sulphoaluminate rapid-hardening cement; Step 2), using a downhole water pipe to evenly spray water on the surface of the fireproof carbon-fixing material until the lower fabric layer and the lower filling layer of the fireproof carbon-fixing material are completely wetted; Step 3), after the fireproof carbon-fixing material is allowed to stand for 30 minutes to solidify and form, a hole is drilled towards the high spontaneous combustion area, and the final hole position is located at the connection position between the crushing area and the separation area; Step 4), injecting liquid CO2 into the spontaneous combustion area of ​​the high-gassing area through drilling holes to quickly cool down the high-temperature coal in the high-gassing area; Step 5) Determine whether the high-temperature spots in the spontaneous combustion area of ​​the high-risk coal roadway are completely eliminated through detection technology; Step 6), if there are still high temperature spots, continue to inject liquid CO2 to extinguish the fire and cool down until the high temperature spots are eliminated; Step 7), if it is determined that the ignition area is extinguished, continue to inject inorganic carbon-fixing slurry material into the ignition area to completely fill the high-ignition area; Step 8), further injecting power plant flue gas into the high-risk area after filling to inertify the residual coal in the high-risk area; at the same time, the CO2 in the flue gas reacts with the inorganic carbon-fixing slurry material to increase the filling strength and density, eliminate air leakage in the high-risk area, and curb the natural fire disaster of the residual coal.

2. A method for controlling spontaneous combustion disasters in high-risk areas of coal lanes in underground coal mines according to claim 1, characterized in that: The detection technology in step 1) and step 5) includes a combination of one or more of infrared thermal imaging detection method, borehole temperature measurement method, and gas detection method.

3. The method for controlling spontaneous combustion disasters in high-risk areas of coal lanes in underground coal mines according to claim 1 is characterized in that: The inorganic carbon-fixing slurry material in step 7) is prepared by using 425 type ordinary Portland cement, water glass and water as raw materials, in a mass ratio of 33-40 parts, 10-12 parts and 48-57 parts, after being stirred and mixed thoroughly; wherein the modulus of water glass is in the range of 1.5-2.

0.

4. The method for controlling spontaneous combustion disasters in high-risk areas of coal lanes in underground coal mines according to claim 1 is characterized in that: In step 8), the flue gas temperature of the power plant is lower than 25°C.

5. The method for controlling spontaneous combustion disasters in high-risk areas of coal lanes in underground coal mines according to claim 1, characterized in that: In step 1), the particle size of the sodium silicate powder and the calcium oxide powder is 0.1-0.5 mm.

6. The method for controlling spontaneous combustion disasters in high-risk areas of coal lanes in underground coal mines according to claim 1, characterized in that: In step 1), the thicknesses of the upper fabric layer, the middle fabric layer and the lower fabric layer of the fireproof carbon fixing material are 1-2 mm respectively, the filling thickness of the upper filling layer is 2-4 mm, and the filling thickness of the lower filling layer is 3-5 mm.