CN110279959B - A kind of fire extinguishing method for spontaneous combustion of coal gangue mountain - Google Patents

Abstract

The invention belongs to the field of coal mine fire extinguishing, relates to a mine fire extinguishing method, and particularly relates to a fire extinguishing method for spontaneous combustion of a gangue dump. The method comprises the following steps: firstly, laying a pipe network in a coal gangue mountain, determining that a certain area is an ignition point if the temperature of the area is detected to be greater than or equal to 350 ℃, then penetrating through a main pipeline and a branch pipeline, and finally performing accurate grouting on the ignition area to finish the fire extinguishing work. By adopting the method of pre-burying the pipeline in the gangue dump, the invention can realize that the pipeline is shared by grouting and temperature measurement, can effectively avoid the problem of difficult drilling in the grouting fire extinguishing process and realize high-efficiency grouting; meanwhile, the ignition area can be effectively determined by monitoring the temperature by the arranged temperature measuring circuit, and accurate grouting is realized, so that the fire extinguishing device is safe and reliable, can hold the best fire extinguishing period, and is high in fire extinguishing efficiency and good in fire extinguishing effect.

Description

A kind of fire extinguishing method for spontaneous combustion of coal gangue mountain

technical field

The invention belongs to the field of coal mine fire extinguishing, and relates to a mine fire extinguishing method, in particular to a fire extinguishing method for spontaneous combustion of coal gangue mountains.

Background technique

Coal gangue is the solid waste discharged from the coal mining process and coal washing process in mines. It is a dark gray rock associated with the coal seam during the coal formation process. Its output accounts for about 10% to 20% of the coal output. There are more than 1,500 mountains, with an accumulation of more than 3 billion tons, accounting for more than 40% of China's total industrial solid waste discharge. Coal gangue mountains not only occupy land resources and affect the ecological environment, but also contain certain combustibles in coal gangue, which are prone to spontaneous combustion under suitable conditions. When the coal gangue mountain spontaneously combusts, it will not only produce a large amount of toxic and harmful gases to pollute the air, but also may cause more destructive accidents such as explosion, resulting in very serious consequences. Fire fighting is critical.

The three indispensable conditions for spontaneous combustion of coal gangue are that coal gangue has a tendency to spontaneously combust, and can be well combined with oxygen at room temperature; there is sufficient oxygen supply and good heat storage conditions. The oxygen supply conditions of coal gangue mountains play a decisive role in the spontaneous combustion of gangue. According to the oxygen supply and heat storage conditions, the gangue mountain can be divided into three areas: (1) Non-spontaneous combustion zone: On the surface of the gangue mountain, although there is continuous oxygen supply, chronic oxidation reaction can continue, but the reaction heat is very high. It is quickly lost to the surrounding environment and is not sufficient to cause spontaneous combustion. (2) Asphyxiation area: Inside the gangue mountain, the oxygen volume fraction in the air is very small, and the heat released during the oxidation reaction is very small, which will basically not heat the gangue, so spontaneous combustion will not occur in this area, and this area is the suffocation area. . (3) Possible spontaneous combustion zone: Between the non-spontaneous combustion zone and the suffocation zone, there is a certain supply of oxygen, and all the heat generated will not be taken away by the outside air. The heat generated by oxidation will heat up the gangue, which is called possible spontaneous combustion. Area. In coal mines, the height of coal gangue hills that are generally accumulated is about 60m, and the accumulation radius of coal gangue hills can reach about 50m. The surface layer of the coal gangue is the non-spontaneous combustion area, and the coal gangue mountain between the suffocation area and the non-spontaneous combustion area is the possible spontaneous combustion area, and the thickness of the possible spontaneous combustion area is about 20m. Therefore, our research area for spontaneous combustion of coal gangue mountain is concentrated in the possible spontaneous combustion area.

At present, the widely used method for extinguishing coal gangue hills at home and abroad is grouting. However, the accumulation of coal gangue is fragmented and irregular, which leads to the first major problem of the grouting method, which is the difficulty of drilling. The stacking height of the coal gangue mountain is as high as 60m or more. Due to the randomness of spontaneous combustion, the fire area may appear at various heights, so the drilling depth is possible from a dozen or even tens of meters, and the existing drilling technology is difficult to achieve. requirements, there are obvious deficiencies in technology. In addition, the second major problem with grouting is that it is difficult to determine the ignition point. The accurate determination of the ignition point is directly related to the effect of grouting fire extinguishing. The spontaneous combustion mechanism of coal gangue mountain is complex, and the accumulation volume is too large. The spontaneous combustion occurs inside the coal gangue mountain, which makes it difficult to determine the fire area, which greatly reduces the effect of grouting for fire extinguishing. The common fire extinguishing of coal gangue mountains is that the staff can determine the fire range by grouting and put out the fire by means of experience. This kind of construction often delays the best fire extinguishing time and the fire extinguishing efficiency is poor.

SUMMARY OF THE INVENTION

The purpose of the present invention is to solve the problems of difficulty in drilling holes and difficult determination of the ignition point in the grouting fire-extinguishing method described in the background art, and provide a fire-extinguishing method for spontaneous combustion of coal gangue mountains, namely pre-buried pipe networks in the coal gangue mountains, It can realize the shared pipeline of grouting and temperature measurement, and realize the precise grouting of the fire area through comprehensive temperature detection of the coal gangue mountain.

The technical solution of the present invention to solve the technical problem is: a fire extinguishing method for spontaneous combustion of coal gangue mountain, comprising the following steps:

S1: First, lay a pipe network in the coal gangue mountain. The pipe network includes a main pipeline and branch pipelines. The main pipeline is vertical and runs through the middle of the coal gangue mountain. The main pipeline is vertically spaced at intervals of 2.5 There are 10~16 branch pipelines connected to ~5m in the horizontal direction. All branch pipelines on the same level are evenly arranged along the circumference of the main pipeline and form a branch pipeline layer. The free ends of all branch pipelines extend to the outer surface of the coal gangue mountain. In the mountain of 2-4m, the branch pipe is made of flower pipe; the main temperature measurement metal wire and the branch temperature measurement metal wire are respectively arranged in the main pipeline and the branch pipeline, and the branch temperature measurement metal wire can detect coal. The temperature information of the specific location of the gangue mountain is collected in real time through the main temperature measurement metal wire to the main detection station; all branch pipelines are provided with at least two layers of paraffin partitions that cut off the branch pipelines along the cross-section. The paraffin insulation layer is connected with copper metal rods; the main pipeline located at the upper end of each branch pipe layer is provided with a main pipeline insulation layer, and the main pipeline insulation layer includes a paraffin layer and a cement layer arranged up and down; The different branch pipeline layers connected to the main pipeline are numbered from top to bottom as i ₁ , i ₂ , i ₃ ...... i _p , and each branch pipeline of each branch pipeline layer is numbered as j ₁ , j respectively ₂ , j ₃ ......j _q , and the number of the temperature-measuring metal wire is A _pq

S2: When the temperature detected at the temperature measuring metal wire of the A _pq branch is greater than or equal to 350°C, it is confirmed that spontaneous combustion occurs in the coal gangue mountain at the qth branch pipe of the p-th branch pipe layer, that is, the realization of the Accurate positioning of the fire area;

S3: Then start to melt the first p layer of the main pipe in the main pipeline. For each layer, first melt the paraffin layer with hot water, then dissolve the cement layer with acetic acid, and alternately use hot water and acetic acid p times until the first p layer of the main pipe The barrier layer is penetrated; the paraffin barrier layer in the qth branch pipe of the p-th branch pipe layer has been melted due to the heat conduction effect of the copper metal rod, and the qth branch pipe from the main pipe inlet to the p-th branch pipe layer has been melted. All circuits are turned on:

S4: Finally, perform precise grouting on the fire area to complete the fire extinguishing work.

In step S1, the main pipeline is connected with 10-16 branch pipelines in the horizontal direction at intervals of 2.5-5m in the vertical distance, and the pipeline network is in a divergent arrangement as a whole, and the pipeline network is spread all over the coal. In the gangue mountain, when a fire occurs, fixed-point grouting can be realized; the free ends of all branch pipes are extended to the mountain body 2~4m away from the outer surface of the coal gangue mountain, because the surface layer of about 5m of the coal gangue mountain is not stable. In the spontaneous combustion area, the free end of the branch pipe can be extended to the mountain 2~4m away from the outer surface of the coal gangue mountain; the branch pipe is made of flower tube, and the wall of the flower tube is evenly distributed with through holes to enable the slurry to flow to the In the coal gangue mountain; the branch temperature measuring metal wire can detect the temperature information of the specific location of the coal gangue mountain and collect it to the main detection station in real time through the main temperature measuring metal wire, so that the ignition point inside the coal gangue mountain can be accurately located; The paraffin partition layer in the branch pipeline in the area will spontaneously ignite and melt when it encounters high temperature. When the paraffin partition layer melts, the branch pipeline where it is located will be connected to facilitate the circulation of slurry, but other branch pipelines in the same branch pipeline layer are not connected. Therefore, the paraffin partition layer is set in the branch pipeline to avoid wasting the slurry and prevent the slurry from grouting into all the branch pipelines of the same branch pipeline layer; all the paraffin partition layers located in the same branch pipeline are phased with copper metal rods. Connection, because the branch pipeline is long, sometimes the coal gangue mountain at a certain position on the branch pipeline spontaneously ignites. In order to conduct this branch pipeline, all the paraffin partition layers are connected with copper metal rods. Copper has good thermal conductivity. , It can quickly conduct the temperature of the ignition area to the whole body of the copper metal rod. The thermal conductivity of copper is 377W/mK, and the temperature of the ignition area is above 350℃. The temperature of heat conduction can quickly reach the melting point of paraffin. The paraffin insulation layer in the pipe is melted; the main pipeline at the upper end of each branch pipe layer is provided with a main pipeline insulation layer, and the main pipeline insulation layer includes a paraffin layer and a cement layer arranged up and down, and a main pipeline insulation layer is set in the main pipeline. In order to ensure that the grout injected during grouting fire extinguishing can accurately reach the fire area instead of reaching the bottom end under the action of gravity; the main pipe partition layer includes a paraffin layer and a cement layer, and the cement layer is used for partitioning and shaping. The paraffin layer acts as a partition to prevent acetic acid from reacting with the cement layer of the excess main pipeline partition layer when penetrating the main pipeline partition layer; the different branch pipeline layers connected to the main pipeline are numbered i ₁ , i ₂ , i ₃ ...... i _p , each branch pipe of each branch pipe layer is numbered as j ₁ , j ₂ , j ₃ ...... j _q , and the branch temperature measurement metal wire is numbered A _pq , and each branch pipe of each layer is numbered as j 1 , j 2 , j 3 ...... j q , respectively The branch temperature measuring metal wires in the branch pipe have different numbers, so by comparing the number of the branch temperature measuring metal wires, they can correspond to different branch pipes, and the precise location of the ignition point can be realized.

Preferably, in the step S1, the specific method for laying the pipe network in the coal gangue mountain is as follows: when the coal gangue mountain starts to accumulate, erect a main pipe with a length of 2.5~5m in the middle of the position of the pre-accumulated coal gangue mountain. Then start to accumulate coal gangue. When the height of the coal gangue mountain is flush with the main road in the p section, connect the p-th branch pipeline layer on the upper part of the p-th main road. After connecting the p-th branch pipeline layer, then Connect the main pipeline of section p-1, then accumulate coal gangue and connect the branch pipeline layer of layer p-1, and repeat the above method until the pipeline network is laid in the coal gangue mountain. When the height of the coal gangue mountain is flush with the main road in the p-th section, connect the p-th branch pipeline layer at the upper part of the p-th main road, then the coal gangue mountain will play an upward supporting role for the p-th layer branch pipeline layer. In the same way, lay the pipe network layer by layer.

Preferably, the main pipe partition layer needs to be laid again after the spontaneous combustion and penetration of the coal gangue mountain. The laying method is to first make a cement layer with a diameter slightly smaller than that of the main pipe, fix at least three ropes on it, and use ropes to connect the cement layer. The layer is hoisted into the proper position of the main pipeline, and then the paraffin layer is poured, and the gap between the cement layer and the main pipeline is filled and fixed by using the fluidity and adhesion of the paraffin to form a new main partition layer. The paraffin barrier layer in the branch pipeline does not need to be laid again after the spontaneous combustion and melting of the coal gangue mountain, because the gap in the coal gangue area where the spontaneous combustion occurred is filled with the slurry injected during the previous fire extinguishing, and there is no oxygen condition. Secondary spontaneous combustion will occur. However, the main barrier layer in the main road needs to be reset, so that the method of the present invention can be reused after spontaneous combustion occurs in other positions of the coal gangue mountain.

Preferably, the cement layer is composed of 93%-97% calcium carbonate and 3%-7% silicate, 93%-97% calcium carbonate is for reacting with acetic acid, 3%-7% The silicate is for styling, calcium carbonate and acetic acid react to generate calcium acetate and carbon dioxide gas.

The beneficial effects of the present invention are: by adopting the method of pre-buying pipelines in coal gangue mountains, grouting and temperature measurement sharing pipelines can be realized, the problem of difficult drilling during grouting and fire extinguishing can be effectively avoided, and efficient grouting can be realized; At the same time, the temperature monitoring by the arranged temperature measurement line can effectively determine the fire area and achieve precise grouting, which is safe and reliable, and can grasp the best fire extinguishing period, with high fire extinguishing efficiency and good fire extinguishing effect.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the coal gangue mountain pipe network distribution of the present invention.

Fig. 2 is a schematic view of the top view structure of the coal gangue mountain pipe network distribution according to the present invention.

Fig. 3 is a partial structural schematic diagram of the main pipeline and branch pipelines of the present invention.

In the picture: 1-main pipeline; 2-branch pipeline; 3-main temperature measuring metal wire; 4- temperature measuring metal wire; 5-paraffin barrier layer; 6-copper metal rod; 7-paraffin layer; 8-cement Floor.

Detailed ways

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of the invention is usually placed in use, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying The device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention. In addition, the terms "first", "second", "third", etc. are only used to differentiate the description and should not be construed as indicating or implying relative importance.

Referring to Figures 1, 2, and 3, a fire extinguishing method for spontaneous combustion of coal gangue hills provided by the present invention will now be described.

A fire extinguishing method for spontaneous combustion of coal gangue mountains, comprising the following steps:

S1: First, lay a pipe network in the coal gangue mountain. As shown in FIG. 1 , the pipe network includes a main pipeline 1 and a branch pipeline 2. The main pipeline 1 is vertical and runs through the middle of the coal gangue mountain. The main pipeline 1 is connected with 10-16 branch pipelines 2 in the horizontal direction at intervals of 2.5-5m in the vertical distance. All branch pipelines 2 on the same horizontal plane are evenly arranged along the circumference of the main pipeline 1 and form a branch pipeline layer. The free ends of the road 2 all extend to the mountain body 2~4m away from the outer surface of the coal gangue mountain, and the branch pipeline 2 is made of flower tubes; the main pipeline 1 and the branch pipeline 2 are respectively provided with connected main temperature measurement The metal wire 3 and the branch temperature measuring metal wire 4, the branch temperature measuring metal wire 4 can detect the temperature information of the specific location of the coal gangue mountain and collect it to the main detection station in real time through the main temperature measuring metal wire 3; all branch pipes 2 are provided with There are at least two paraffin barrier layers 5 that cut off the branch pipes 2 along the cross-section, and all paraffin barrier layers 5 located in the same branch pipe are connected with copper metal rods 6; the main pipe 1 located at the upper end of each branch pipe layer Both are provided with a main pipe isolation layer, and the main pipe isolation layer includes a paraffin layer 7 and a cement layer 8 arranged up and down; the branch temperature measurement metal wires 4 are numbered, and the different branch pipeline layers connected with the main pipe 1 are sequentially from top to bottom. Numbered as i ₁ , i ₂ , i ₃ ...... i _p , each branch pipeline 2 of each branch pipeline layer is numbered as j ₁ , j ₂ , j ₃ ...... j _q , and then branched to the temperature measurement metal wire 4 The number is _Apq ;

S2: When the temperature detected at the temperature measuring metal wire 4 of the A _pq branch is greater than or equal to 350°C, it is confirmed that spontaneous combustion has occurred in the coal gangue mountain at the qth branch pipe 2 of the p-th branch pipe layer, that is, Accurate positioning of the fire area is achieved;

S3: Then start to melt the first p layer of the main pipe partition layer in the main pipe 1. For each layer, first use hot water to melt the paraffin layer 7, then use acetic acid to dissolve the cement layer 8, and alternately use hot water and acetic acid p times until the previous The p-layer main pipe insulation layer is penetrated; the paraffin insulation layer 5 in the q-th branch pipe 2 of the p-th layer branch pipe layer has been melted due to the heat conduction effect of the copper metal rod 6, then from the main pipe 1 inlet to the p-th layer branch pipe The qth branch pipeline 2 of the road layer is all connected:

S4: Finally, perform precise grouting on the fire area to complete the fire extinguishing work.

In step S1, the main pipeline 1 is connected with 10 to 16 branch pipelines 2 along the horizontal direction at intervals of 2.5 to 5 m in the vertical distance, and the pipeline network is in a divergent arrangement as a whole, and the pipeline network is spread all over the place. In the coal gangue mountain described above, when a fire occurs, fixed-point grouting can be realized; the free ends of all branch pipes 2 are extended to the mountain body 2~4m away from the outer surface of the coal gangue mountain, because the coal gangue mountain is about 5m away. The surface layer is a non-spontaneous combustion area, so the free end of the branch pipeline 2 can be extended to the mountain body 2~4m away from the outer surface of the coal gangue mountain; the branch pipeline 2 is made of flower tube, and the tube wall of the flower tube is evenly distributed with pipes The hole can make the slurry flow into the coal gangue mountain; the branch temperature measuring metal wire 4 can detect the temperature information of the specific location of the coal gangue mountain and collect it to the main detection station in real time through the main temperature measuring metal wire 3, so that the detection of the coal gangue can be realized. The ignition point inside the mountain is precisely located; the paraffin partition layer 5 in the branch pipeline 2 in the fire area will spontaneously ignite and melt when it encounters high temperature. The other branch pipes in the branch pipe layer are not connected, so the paraffin barrier layer 5 is set in the branch pipe 2 to avoid wasting the slurry and prevent the slurry from grouting into all the branch pipes 2 of the same branch pipe layer; All paraffin insulation layers 5 in the branch pipe are connected with copper metal rods 6. Because the branch pipe 2 is long, sometimes the coal gangue mountain at a certain position on the branch pipe 2 spontaneously ignites. In order to conduct this branch pipe 2 , connect all paraffin partition layers 5 with copper metal rods 6, copper has good thermal conductivity, and can quickly conduct the temperature of the ignition area to the whole body of copper metal rods 6, the thermal conductivity of copper is 377W/mK, The temperature of the ignition area is above 350°C, and the temperature of heat conduction can quickly reach the melting point of paraffin to melt the paraffin insulation layer 5 in the same branch pipe; the main pipe 1 located at the upper end of each branch pipe layer is provided with a main pipe The barrier layer, the main pipe barrier layer includes the paraffin layer 7 and the cement layer 8 arranged up and down, and the main pipe barrier layer is set in the main pipe 1 in order to ensure that the grout injected during grouting fire extinguishing can accurately reach the fire area instead of arriving under the action of gravity. The bottom end; the main pipe cut-off layer includes a paraffin layer 7 and a cement layer 8, and the cement layer 8 is for the purpose of partitioning and shaping. Reacts with the cement layer 8 of the excess main pipe cutoff layer; the different branch pipe layers connected to the main pipe 1 are sequentially numbered i ₁ , i ₂ , i ₃ ...... i _p from top to bottom, and each branch pipe layer of each layer The branch pipes 2 are respectively _numbered as _{j 1} , j ₂ , j ₃ ...... Therefore, by comparing the number of the branch temperature measuring metal wire 4, it can correspond to the branch pipe that is not used, and the precise location of the ignition point can be realized.

Further, as a specific embodiment of the fire extinguishing method for spontaneous combustion of coal gangue hills according to the present invention, in the step S1, the specific method of laying a pipe network in the coal gangue hills is: when the coal gangue hills are When starting to accumulate, erect the main road 1 with a length of 2.5~5m in the p section in the middle of the pre-accumulated coal gangue hill, and then start to accumulate coal gangue. When the height of the coal gangue hill is flush with the main road 1 in the p section, The upper part of the main pipeline 1 of section p is connected to the branch pipeline layer of the p-th layer. After the branch pipeline layer of the p-th layer is connected, the main pipeline 1 of the p-1 section is connected, and then coal gangue is piled up and the branch pipeline of the p-1 layer is connected. Road layer, repeat the above method until the pipe network is laid in the coal gangue mountain. When the height of the coal gangue mountain is flush with the main pipeline 1 of the p-th section, connect the p-th branch pipeline layer on the upper part of the p-th main pipeline 1, then the coal gangue mountain will support the p-th branch pipeline layer upwards. In the same way, lay the pipe network layer by layer.

Further, as a specific embodiment of the fire extinguishing method for spontaneous combustion of coal gangue hills according to the present invention, the main pipe partition layer needs to be laid again after the spontaneous combustion and penetration of coal gangue hills, and the laying method is first. Make a cement layer 8 with a diameter slightly smaller than the main pipe 1, fix at least three ropes on it, use ropes to hoist the cement layer 8 into the proper position of the main pipe 1, and then pour the paraffin layer 7, using the fluidity and viscosity of the paraffin wax. The adhesion between the cement layer 8 and the main pipe 1 is filled and fixed to form a new main pipe isolation layer. The paraffin barrier layer 5 in the branch pipeline 2 does not need to be laid again after the spontaneous combustion of the coal gangue mountain melts away, because the gap in the coal gangue area where the spontaneous combustion occurred is filled with the slurry injected during the previous fire extinguishing and does not have oxygen conditions , secondary spontaneous combustion will not occur. However, the main barrier layer in the main pipeline 1 needs to be reset, so that the method of the present invention can be reused after spontaneous combustion occurs in other positions of the coal gangue mountain.

Further, as a specific embodiment of the fire extinguishing method for coal gangue mountain spontaneous combustion according to the present invention, the cement layer 8 is composed of 93%-97% calcium carbonate and 3%-7% silicic acid. 93%~97% of calcium carbonate is used to react with acetic acid, 3%~7% of silicate is used for setting, and calcium carbonate and acetic acid are reacted to generate calcium acetate and carbon dioxide gas.

Further, as a specific embodiment of the fire extinguishing method for spontaneous combustion of coal gangue hills according to the present invention, the thickness of the paraffin barrier layer 5, the cement layer 8 and the paraffin layer 7 are all 4-10 cm. Within this range, they can just achieve their respective roles without wasting materials.

Further, as a specific embodiment of the fire extinguishing method for coal gangue mountain spontaneous combustion according to the present invention, the main pipe 1 is a seamless steel pipe for grouting, and the branch pipe 2 is composed of a flower pipe and a steel pipe. Alternately laid at intervals of 1m, the main pipeline 1 has to withstand a large impact force during grouting, so seamless steel pipes can better meet the strength requirements; the branch pipelines 2 are alternately laid with flower pipes and steel pipes at an interval of 1m to save costs. , the cost of the flower tube is higher than that of the steel tube.

Further, as a specific embodiment of the fire extinguishing method for spontaneous combustion of coal gangue hills according to the present invention, the main temperature measuring metal wire 3 and the branch temperature measuring metal wire 4 are coated with polytetrafluoroethylene. Floor. The polytetrafluoroethylene layer is resistant to high temperature, acid and alkali, and various organic solvents, so as to avoid corrosion of the temperature-measuring metal wire under long-term environmental action.

Further, as a specific embodiment of the fire extinguishing method for spontaneous combustion of coal gangue mountains according to the present invention, the surface of the flower tube in the branch pipeline 2 is wrapped with a layer of EPDM rubber. The ethylene-propylene diene The through hole on the flower tube on the fire area can be connected, so that the slurry can flow into the burning coal gangue from the pipeline of the branch pipeline 2, and it can also prevent the slurry from leaking from the flower tube in the unfired area, saving energy. The grouting material can more accurately grouting the fire area.

Further, as a specific embodiment of the fire extinguishing method for coal gangue mountain spontaneous combustion according to the present invention, an end cover is provided on the nozzle at the upper end of the main pipe 1 . An end cap is provided on the orifice at the upper end of the main pipe 1 to prevent foreign matter from entering the main pipe 1 to block it.

Further, as a specific embodiment of the fire extinguishing method for spontaneous combustion of coal gangue hills according to the present invention, in step S1, the main pipe 1 is connected with 12 pipes along the horizontal direction at intervals of 3m in the vertical distance. Branch pipeline 2; the free ends of all branch pipelines 2 extend into the mountain body 3m away from the outer surface of the coal gangue mountain; between the main pipeline 1 and the main pipeline 1, and between the main pipeline 1 and the branch pipeline 2, welding, Flange connection and other connection methods; the paraffin partition layer and the paraffin layer are both made of No. 52 paraffin. It is obtained through calculation and experiment that the above design parameters can achieve the best fire extinguishing effect. In a specific implementation, the pipe diameter of the main pipe 1 is 12 inches or 14 inches, and the pipe diameter of the branch pipe 2 is 4 inches, 5 inches or 6 inches. Paraffin No. 52 has a lower melting point and is more sensitive to temperature increases.

The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned embodiments, and can also be made within the scope of knowledge possessed by those of ordinary skill in the art without departing from the purpose of the present invention. Various changes.

Claims (10)

1. a fire-extinguishing method for coal gangue mountain spontaneous combustion, is characterized in that, comprises the following steps: S1: First, a pipe network is laid in the coal gangue mountain. The pipe network includes a main pipeline (1) and a branch pipeline (2). The main pipeline (1) is vertically and penetrated in the middle of the coal gangue mountain. The main pipeline (1) is connected with 10-16 branch pipelines (2) in the horizontal direction at intervals of 2.5-5m in the vertical distance, and all branch pipelines (2) on the same horizontal plane are evenly arranged along the circumference of the main pipeline (1). And a branch pipeline layer is formed, the free ends of all branch pipelines (2) extend to the mountain body 2~4m away from the outer surface of the coal gangue mountain, and the branch pipelines (2) are made of flower tubes; the main pipeline (1) The main temperature measuring metal wire (3) and the branch temperature measuring metal wire (4) connected to the branch pipeline (2) are respectively provided, and the branch temperature measuring metal wire (4) can detect the temperature information of the specific location of the coal gangue mountain. And through the main temperature measurement metal wire (3), it is collected to the main detection station in real time; all branch pipelines (2) are provided with at least two layers of paraffin partition layers (5) that cut off the branch pipelines (2) along the cross section, located in the same branch. All paraffin insulation layers (5) in the pipeline are connected with copper metal rods (6); the main pipeline (1) located at the upper end of each branch pipeline layer is provided with a main pipeline insulation layer, and the main pipeline insulation layer includes The paraffin layer (7) and the cement layer (8) are arranged up and down; the branch temperature measuring metal wires (4) are numbered, and the different branch pipeline layers connected to the main pipeline (1) are numbered i ₁ , i from top to bottom. ₂ , i ₃ ...... i _p , each branch pipe (2) of each branch pipe layer is numbered as j ₁ , j ₂ , j ₃ ...... j _q , and the branch temperature measurement metal wire (4) is numbered as A _pq ; S2: When the temperature detected at the A _pq branch temperature measurement metal wire (4) is greater than or equal to 350 °C, confirm that the coal gangue mountain at the qth branch pipe (2) of the p layer branch pipe layer is in the coal gangue mountain. Spontaneous combustion occurs, that is, accurate positioning of the fire area is achieved; S3: Then start to melt the front p-layer main partition layer in the main pipeline (1). For each layer, first use hot water to melt the paraffin layer (7), then use acetic acid to dissolve the cement layer (8), alternately use hot water and Acetic acid p times, until the former p-layer main pipe barrier layer is penetrated; the paraffin barrier layer (5) in the qth branch pipe (2) of the p-th layer branch pipe layer has melted due to the thermal conductivity of the copper metal rod (6). , then the qth branch pipeline (2) from the inlet of the main pipeline (1) to the pth branch pipeline layer is all penetrated; S4: Finally, perform precise grouting on the fire area to complete the fire extinguishing work. 2. a kind of fire extinguishing method for coal gangue mountain spontaneous combustion according to claim 1, is characterized in that, in described step S1, the concrete method of laying pipe network in coal gangue mountain body is: when coal gangue mountain begins to pile up , erect the main road (1) with a length of 2.5~5m in the p section in the middle of the position of the pre-accumulated coal gangue hill, and then start to accumulate coal gangue. When the height of the coal gangue hill is flush with the main road (1) in the p section , connect the p-th branch pipeline layer on the upper part of the main pipeline (1) in the p-th section, after connecting the p-th layer branch pipeline layer, connect the main pipeline (1) in the p-1 section, and then accumulate the coal gangue and connect the For the branch pipeline layer of the p-1 layer, the above method is repeated until the pipeline network is laid in the coal gangue mountain. 3. a kind of fire-extinguishing method for coal gangue hill spontaneous combustion according to claim 2, is characterized in that, described main pipe cut-off layer needs to be laid again after coal gangue hill is spontaneously combusted through, and the laying method is to make a The cement layer (8) is slightly smaller in diameter than the main pipe (1), at least three ropes are fixed on it, the cement layer (8) is hoisted into the proper position of the main pipe (1) with ropes, and then the paraffin layer (7) is poured , using the fluidity and adhesion of paraffin to fill and fix the gap between the cement layer (8) and the main pipe (1) to form a new main pipe isolation layer. 4. A fire extinguishing method for spontaneous combustion of coal gangue mountains according to claim 1, 2 or 3, wherein in the step S1, the cement layer (8) is composed of 93%-97% carbonic acid It is made of calcium and 3%~7% silicate. The fire extinguishing method for spontaneous combustion of coal gangue mountain according to claim 4, characterized in that, in the step S1, in the step S1, the paraffin barrier layer (5), the cement layer (8) ) and the paraffin layer (7) are both 4-10 cm thick. 6. A fire extinguishing method for coal gangue mountain spontaneous combustion according to claim 5, characterized in that the main pipe (1) is a seamless steel pipe for grouting, and the branch pipe (2) is composed of a flower pipe Lay alternately with the steel pipe at an interval of 1m. 7 . The fire extinguishing method for spontaneous combustion of coal gangue mountains according to claim 6 , wherein the main temperature measuring metal wire ( 3 ) and the branch temperature measuring metal wire ( 4 ) are coated with polytetrafluoroethylene. 8 . vinyl fluoride layer. 8 . The fire extinguishing method for spontaneous combustion of coal gangue mountains according to claim 7 , wherein the surface of the flower tube in the branch pipeline ( 2 ) is wrapped with a layer of EPDM rubber. 9 . 9 . The fire extinguishing method for spontaneous combustion of coal gangue mountains according to claim 8 , wherein an end cover is provided on the nozzle at the upper end of the main pipe ( 1 ). 10 . 10 . The fire extinguishing method for spontaneous combustion of coal gangue hills according to claim 9 , wherein in step S1 , the main pipe ( 1 ) is connected with 12 pipes along the horizontal direction at intervals of 3 m in the vertical distance. 11 . Branch pipelines (2); the free ends of all branch pipelines (2) extend into the mountain 3m away from the outer surface of the coal gangue mountain; between the main pipeline (1) and the main pipeline (1), the main pipeline (1) The connection mode of welding and flange connection is adopted between the branch pipeline (2); the paraffin partition layer and the paraffin layer are both made of No. 52 paraffin.

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