CN110279959B - Fire extinguishing method for spontaneous combustion of coal gangue dump - Google Patents
Fire extinguishing method for spontaneous combustion of coal gangue dump Download PDFInfo
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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
Technical Field
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.
Background
The coal gangue is solid waste discharged in the coal mining process and the coal washing process of a mine, is black and gray rock associated with a coal bed in the coal forming process, and has the yield of about 10-20% of the coal yield, more than 30 hundred million tons of accumulated amount and more than 40% of the total amount of solid waste discharged in China, wherein the accumulated amount is more than 1500% of the existing gangue dump in China at present. The coal gangue hill not only occupies land resources and affects the ecological environment, but also contains certain combustible substances and is easy to spontaneously combust under proper conditions. After the coal gangue dump is spontaneously combusted, a large amount of toxic and harmful gas polluted air can be generated, more destructive accidents such as explosion and the like are more likely to be caused, and serious consequences are caused, so that the method is of great importance in quickly, effectively and accurately extinguishing the spontaneously combusted coal gangue dump.
The indispensable 3 conditions of spontaneous combustion of the coal gangue are that the coal gangue has spontaneous combustion tendency and can be well combined with oxygen at normal temperature; has sufficient oxygen supply and good heat storage condition. The oxygen supply condition of the coal gangue dump plays a decisive role in spontaneous combustion of the gangue. According to the conditions of oxygen supply and heat storage, the waste rock mountain can be divided into 3 areas, (1) a non-spontaneous combustion area, namely, on the surface of the waste rock mountain, although oxygen is continuously supplied, chronic oxidation reaction can also be continuously generated, but the reaction heat release is quickly dissipated to the surrounding environment and is not enough to cause spontaneous combustion. (2) And in the suffocation area, the volume fraction of oxygen in the air is very small in the gangue dump, the heat released in the oxidation reaction process is very little, and the gangue is basically not heated, so that spontaneous combustion cannot occur in the area, and the area is the suffocation area. (3) The possible spontaneous combustion area is a possible spontaneous combustion area, namely, a certain oxygen supply is provided between the non-spontaneous combustion area and the suffocation area, the generated heat cannot be completely taken away by the outside air, and the heat generated by oxidation heats the gangue. In a coal mine, the height of a common stacking-formed coal gangue dump is about 60m, wherein the stacking radius of the coal gangue dump can reach about 50m, a suffocation area of the coal gangue dump is an innermost coal gangue dump body with the stacking radius of about 25m, a surface layer of the coal gangue dump about 5m is a non-spontaneous combustion area, the coal gangue dump body between the suffocation area and the non-spontaneous combustion area is a possible spontaneous combustion area, and the thickness of the possible spontaneous combustion area is about 20 m. Therefore, the fire extinguishing research area for spontaneous combustion of the coal gangue dump is concentrated on a possible spontaneous combustion area.
The existing coal gangue dump fire extinguishing method widely adopted at home and abroad is a grouting method, and the deep hole grouting fire extinguishing technology has good effect in fire extinguishing of a plurality of spontaneous combustion coal gangue dumps. However, the stacking and crushing of the coal gangue are irregular, so that the first big problem of the grouting method is the difficulty in drilling. The stacking height of the coal gangue dump is as high as more than 60m, and due to the randomness of spontaneous combustion, ignition areas can appear at all heights, so that the drilling depth is from dozens of meters to dozens of meters, while the existing drilling technology is difficult to meet the requirements, and has obvious defects in the technology. Furthermore, the second major problem with slip casting is the difficulty in determining the ignition point. The accurate determination of the ignition point is directly related to the grouting fire extinguishing effect. The spontaneous combustion mechanism of the coal gangue dump is complex, the accumulation volume is too large, and spontaneous combustion occurs in the coal gangue dump, so that the ignition area is difficult to determine, and the grouting fire extinguishing effect is greatly reduced. The common coal gangue dump is used for extinguishing fire by grouting in a manner that a worker roughly determines a firing range through experience, the best fire extinguishing time is delayed by the construction, and the fire extinguishing efficiency is poor.
Disclosure of Invention
The invention aims to solve the problems of difficult drilling and difficult fire point determination of the grouting fire extinguishing method in the background technology, and provides a fire extinguishing method for spontaneous combustion of a coal gangue dump, namely, a pipe network is embedded in the coal gangue dump, a shared pipeline of grouting and temperature measurement can be realized, accurate grouting in a fire area is realized by detecting the overall temperature of the coal gangue dump, the method is safe and reliable, the optimal fire extinguishing period can be held, the fire extinguishing efficiency is high, and the fire extinguishing effect is good.
The technical scheme for solving the technical problem is as follows: a fire extinguishing method for spontaneous combustion of a gangue dump comprises the following steps:
s1: firstly, laying a pipe network in a coal gangue mountain, wherein the pipe network comprises a main pipeline and branch pipelines, the main pipeline is vertically arranged in the middle of the coal gangue mountain in a penetrating mode, 10-16 branch pipelines are connected to the main pipeline at intervals of 2.5-5 m in the vertical distance along the horizontal direction, all branch pipelines on the same horizontal plane are uniformly arranged along the circumferential direction of the main pipeline and form a branch pipeline layer, the free ends of all the branch pipelines extend into the mountain 2-4 m away from the outer surface of the coal gangue mountain, and the branch pipelines are made of floral tubes; the main pipeline and the branch pipelines are respectively provided with a main temperature measuring metal wire and a branch temperature measuring metal wire which are communicated with each other, and the branch temperature measuring metal wires can detect temperature information of specific positions of the gangue dump and collect the temperature information to the main detection station in real time through the main temperature measuring metal wires; all branch pipelines are provided with at least two paraffin partition layers for partitioning the branch pipelines along the cross section, and all the paraffin partition layers in the same branch pipeline are connected by a copper metal bar; a main pipe partition layer is arranged in the main pipeline at the upper end of each branch pipe layer, and comprises a paraffin layer and a cement layer which are arranged up and down; numbering the branch temperature measuring metal wires, wherein different branch pipeline layers connected with the main pipeline are numbered as i from top to bottom in sequence1、i2、i3……ipEach branch pipeline of each branch pipeline layer is numbered j1、j2、j3……jqAnd the number of the temperature measuring metal wire is Apq
S2: when it is in the first placepqWhen the temperature detected at the branch temperature measurement metal wire is greater than or equal to 350 ℃, the spontaneous combustion in the coal gangue mountain body at the qth branch pipeline of the p-th branch pipeline layer is confirmed, and the accurate positioning of the ignition area is realized;
s3: then, the front p layers of main pipe partition layers in the main pipeline are melted, each layer is formed by melting a paraffin layer with hot water, then dissolving a cement layer with acetic acid, and alternately using the hot water and the acetic acid for p times until the front p layers of main pipe partition layers are communicated; the paraffin cut off layer in the qth branch pipeline on the pth branch pipeline layer has melted because of the heat conduction effect of the copper metal bar, then the qth branch pipeline from the main pipeline entry to the pth branch pipeline layer is all conducted:
s4: and finally, performing accurate grouting on the fire area to finish the fire extinguishing work.
In the step S1, 10-16 branch pipelines are connected to the main pipeline along the horizontal direction at intervals of 2.5-5 m in the vertical distance, so that the pipe network is arranged in a divergent manner as seen as a whole, the pipe network is distributed in the coal gangue mountain, and when a fire occurs, fixed-point grouting can be realized; the free ends of all branch pipelines extend to the mountain body 2-4 m away from the outer surface of the coal gangue hill, and the free ends of the branch pipelines extend to the mountain body 2-4 m away from the outer surface of the coal gangue hill because the surface layer of the coal gangue hill about 5m is a non-spontaneous combustion area; the branch pipe is made of a perforated pipe, and through holes are uniformly distributed on the pipe wall of the perforated pipe, so that slurry can flow into the coal gangue mountain; the branch temperature measuring metal wire can detect temperature information of a specific position of the coal gangue dump and collects the temperature information to the main detection station in real time through the main temperature measuring metal wire, so that the accurate positioning of an ignition point in the coal gangue dump can be realized; the paraffin partition layer in the branch pipeline of the fire area can be spontaneously combusted and melted when meeting high temperature, when the paraffin partition layer is melted, the branch pipeline is communicated, so that slurry can conveniently flow, but other branch pipelines in the same branch pipeline layer are not communicated, so that the paraffin partition layer is arranged in the branch pipeline to avoid wasting the slurry and prevent the slurry from being injected into all branch pipelines of the same branch pipeline layer; all paraffin partition layers in the same branch pipe are connected by copper metal bars, because the branch pipe is long, sometimes coal gangue mountain bodies at a certain position on the branch pipe spontaneously combust, in order to conduct the branch pipe, all the paraffin partition layers are connected by the copper metal bars, copper has good thermal conductivity, the temperature of a firing area can be rapidly transmitted to the whole body of the copper metal bars, the thermal conductivity coefficient of the copper is 377W/mK, the temperature of the firing area is more than 350 ℃, and the thermal conductivity temperature can completely and rapidly reach the melting point of paraffin to melt the paraffin partition layers in the same branch pipe; at each branch pipe layerThe main pipe isolating layer is arranged in the main pipe to ensure that injected slurry can accurately reach a firing area when grouting for fire extinguishing but not reach the bottommost end under the action of gravity; the main pipe partition layer comprises a paraffin layer and a cement layer, the cement layer is used for partitioning and shaping, the paraffin layer is used for partitioning, and acetic acid is prevented from reacting with the redundant cement layer of the main pipe partition layer when the paraffin layer penetrates through the main pipe partition layer; different branch pipeline layers connected with the main pipeline are numbered i from top to bottom in sequence1、i2、i3……ipEach branch pipeline of each branch pipeline layer is numbered j1、j2、j3……jqAnd the number of the temperature measuring metal wire is ApqAnd the branch temperature measuring metal wires in each branch pipe on each layer have different numbers, so that the numbers of the branch temperature measuring metal wires can correspond to different branch pipes, and accurate positioning of ignition points can be realized.
Preferably, in step S1, the concrete method for laying the pipe network in the gangue dump body is as follows: when the coal gangue dump starts to be stacked, erecting a main pipeline with the length of the p-th section of 2.5-5 m in the middle of the position where the coal gangue dump is pre-stacked, then starting to stack coal gangue, when the height of the coal gangue dump is flush with the p-th section of the main pipeline, connecting a p-th branch pipeline layer to the upper part of the p-th section of the main pipeline, connecting a p-1-th main pipeline after the p-th branch pipeline layer is connected, then stacking coal gangue and connecting a p-1-th branch pipeline layer, and repeating the method until a pipe network is laid in a coal gangue dump body. When the height of the coal gangue dump is level with the pth main pipeline, a pth branch pipeline layer is connected on the upper portion of the pth main pipeline, so the coal gangue dump can play a role in upwards supporting the pth branch pipeline layer, and a pipe network is laid on the same layer.
Preferably, the main pipe partition layer needs to be laid again after the spontaneous combustion of the gangue dump occurs, the laying method is that a cement layer with a diameter slightly smaller than that of the main pipeline is firstly made, at least three ropes are fixed on the cement layer, the cement layer is hung to a proper position of the main pipeline through the ropes, then a paraffin layer is poured, and gaps between the cement layer and the main pipeline are filled and fixed through the fluidity and the adhesion of the paraffin to form a new main pipe partition layer. The paraffin partition layer in the branch pipeline does not need to be laid again after the coal gangue dump is spontaneously combusted and melted, and the reason is that the gap in the coal gangue area where the over spontaneous combustion occurs is filled with the grout injected during the previous fire extinguishing without oxygen condition, so that the secondary spontaneous combustion cannot occur. The main pipe partition layer in the main pipeline needs to be reset, so that the method can be reused after spontaneous combustion occurs at other positions of the gangue dump.
Preferably, the cement layer is formed by mixing 93-97% of calcium carbonate and 3-7% of silicate, the 93-97% of calcium carbonate is used for reacting with acetic acid, the 3-7% of silicate is used for shaping, and calcium acetate and carbon dioxide gas are generated after the calcium carbonate reacts with the acetic acid.
The invention has the beneficial effects that: by adopting the method of pre-embedding the pipeline in the gangue dump, the pipeline sharing between grouting and temperature measurement can be realized, the problem of difficult drilling in the grouting fire extinguishing process can be effectively avoided, and efficient grouting is realized; 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.
Drawings
FIG. 1 is a schematic view of the overall structure of the pipe network distribution of the gangue dump of the present invention.
FIG. 2 is a schematic diagram of a top view structure of a coal gangue dump pipe network distribution of the present invention.
Fig. 3 is a partial structural schematic view of the main pipeline and the branch pipeline of the present invention.
In the figure: 1-a main pipeline; 2-branch pipeline; 3-main temperature measuring metal wire; 4-temperature measuring metal wires; 5-paraffin wax isolating layer; 6-a metal bar made of copper; 7-a paraffin layer; 8-cement layer.
Detailed Description
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. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the 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. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention usually place when in use, and are only used for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Referring to the attached drawings 1, 2 and 3, the fire extinguishing method for spontaneous combustion of the gangue dump provided by the invention is explained.
A fire extinguishing method for spontaneous combustion of a gangue dump comprises the following steps:
s1: firstly, laying a pipe network in a coal gangue mountain, as shown in figure 1, wherein the pipe network comprises a main pipeline 1 and branch pipelines 2, the main pipeline 1 is vertically arranged in the middle of the coal gangue mountain in a penetrating manner, 10-16 branch pipelines 2 are connected to the main pipeline 1 at intervals of 2.5-5 m in the vertical distance along the horizontal direction, all the branch pipelines 2 on the same horizontal plane are uniformly arranged along the circumferential direction of the main pipeline 1 and form branch pipeline layers, the free ends of all the branch pipelines 2 extend into the mountain 2-4 m away from the outer surface of the coal gangue mountain, and the branch pipelines 2 are made of floral tubes; the main pipeline 1 and the branch pipeline 2 are respectively provided with a main temperature measuring metal wire 3 and a branch temperature measuring metal wire 4 which are communicated with each other, and the branch temperature measuring metal wires 4 can detect temperature information of specific positions of the gangue dump and collect the temperature information to a main detection station in real time through the main temperature measuring metal wires 3; all branch pipelines 2 are provided with at least two layers of edge sections for cutting the branch pipelines 2The surface-isolated paraffin partition layers 5 are connected by copper metal bars 6, and all the paraffin partition layers 5 positioned in the same branch pipe are connected by copper metal bars 6; a main pipe partition layer is arranged in the main pipeline 1 at the upper end of each branch pipe layer, and comprises a paraffin layer 7 and a cement layer 8 which are arranged up and down; numbering the branch temperature measuring metal wires 4, wherein different branch pipeline layers connected with the main pipeline 1 are numbered i from top to bottom in sequence1、i2、i3……ipEach branch pipeline 2 of each branch pipeline layer is respectively numbered as j1、j2、j3……jqAnd the number of the temperature measuring metal wire 4 is Apq；
S2: when it is in the first placepqWhen the temperature detected at the branch temperature measuring metal wire 4 is greater than or equal to 350 ℃, the spontaneous combustion in the coal gangue mountain body at the qth branch pipeline 2 of the pth branch pipeline layer is confirmed, namely the accurate positioning of the ignition area is realized;
s3: then, the front p layers of main pipe partition layers in the main pipeline 1 begin to be melted, each layer is formed by firstly melting the paraffin layer 7 with hot water, then dissolving the cement layer 8 with acetic acid, and alternately using the hot water and the acetic acid for p times until the front p layers of main pipe partition layers are communicated; paraffin cut off layer 5 in the qth branch pipeline 2 on the pth branch pipeline layer has melted because of the heat conduction effect of copper metal bar 6, then the qth branch pipeline 2 from the main pipeline 1 entry to the pth branch pipeline layer is all switched on:
s4: and finally, performing accurate grouting on the fire area to finish the fire extinguishing work.
In the step S1, 10-16 branch pipelines 2 are connected to the main pipeline 1 at intervals of 2.5-5 m in the vertical distance along the horizontal direction, so that the pipe network is arranged in a divergent manner as seen from the whole, the pipe network is distributed in the coal gangue mountain, and when a fire occurs, fixed-point grouting can be realized; the free ends of all the branch pipelines 2 extend to the mountain body 2-4 m away from the outer surface of the coal gangue hill, and because the surface layer of the coal gangue hill about 5m is a non-spontaneous combustion area, the free ends of the branch pipelines 2 only extend to the mountain body 2-4 m away from the outer surface of the coal gangue hill; the branch pipeline 2 is made of a perforated pipe, and through holes are uniformly distributed on the pipe wall of the perforated pipe, so that slurry can flow into a coal gangue mountain; the temperature measuring metal wire 4 can be detectedThe temperature information of the specific position of the coal gangue dump is collected to a general detection station in real time through a main temperature measuring metal wire 3, so that the accurate positioning of the ignition point in the coal gangue dump can be realized; the paraffin partition layer 5 in the branch pipeline 2 in the fire area can be spontaneously combusted and melted when meeting high temperature, when the paraffin partition layer 5 is melted, the branch pipeline 2 is communicated, so that the slurry can conveniently flow, but other branch pipelines in the same branch pipeline layer are not communicated, so that the paraffin partition layer 5 is arranged in the branch pipeline 2 to avoid slurry waste and slurry injection into all branch pipelines 2 in the same branch pipeline layer; all the paraffin partition layers 5 in the same branch pipe are connected by copper metal bars 6, because the branch pipe 2 is long, sometimes coal gangue mountain bodies at a certain position on the branch pipe 2 spontaneously combust, in order to conduct the branch pipe 2, all the paraffin partition layers 5 are connected by the copper metal bars 6, copper has good thermal conductivity and can rapidly transmit the temperature of an ignition area to the whole body of the copper metal bars 6, the thermal conductivity coefficient of copper is 377W/mK, the temperature of the ignition area is more than 350 ℃, and the temperature of the thermal conductivity can completely and rapidly reach the melting point of paraffin to melt the paraffin partition layers 5 in the same branch pipe; a main pipe partition layer is arranged in the main pipeline 1 at the upper end of each branch pipe layer, the main pipe partition layer comprises a paraffin layer 7 and a cement layer 8 which are arranged up and down, and the main pipe partition layer is arranged in the main pipeline 1 so as to ensure that injected slurry can accurately reach a firing area when grouting fire extinguishment is carried out, but not reach the bottommost end under the action of gravity; the main pipe isolating layer comprises a paraffin layer 7 and a cement layer 8, the cement layer 8 is used for isolating and shaping, the paraffin layer 7 is used for isolating, and acetic acid is prevented from reacting with the redundant cement layer 8 of the main pipe isolating layer when the paraffin layer 7 penetrates through the main pipe isolating layer; different branch pipeline layers connected with the main pipeline 1 are numbered i from top to bottom in sequence1、i2、i3……ipEach branch pipeline 2 of each branch pipeline layer is respectively numbered as j1、j2、j3……jqAnd the number of the temperature measuring metal wire 4 is ApqThe branch temperature measuring metal wire 4 in each branch pipe on each layer has different numbers, so the numbers of the branch temperature measuring metal wires 4 can be compared to the numbers of the branch temperature measuring metal wires 4 without usingThe branch pipe can realize the accurate positioning of the ignition point.
Further, as a specific embodiment of the fire extinguishing method for spontaneous combustion of the gangue dump according to the present invention, in step S1, a specific method for laying a pipe network in the gangue dump body is as follows: when the coal gangue dump starts to be stacked, erecting a main pipeline 1 with the length of the p-th section of 2.5-5 m at the middle part of the position where the coal gangue dump is pre-stacked, then starting to stack coal gangue, when the height of the coal gangue dump is flush with the p-th main pipeline 1, connecting a p-th branch pipeline layer at the upper part of the p-th main pipeline 1, connecting the p-th branch pipeline layer, then connecting the p-1-th main pipeline 1, then stacking coal gangue and connecting the p-1-th branch pipeline layer, and repeating the method until a pipe network is laid in the coal gangue dump body. When the height of coal gangue dump and the level of the p-th main pipeline 1, the upper part of the p-th main pipeline 1 is connected with the p-th branch pipeline layer, so the coal gangue dump can play a role of upward bearing for the p-th branch pipeline layer, and the pipe network is laid on the same layer.
Further, as a specific implementation manner of the fire extinguishing method for spontaneous combustion of the coal gangue dump, the main pipe partition layer needs to be laid again after the coal gangue dump is subjected to spontaneous combustion and communicated, the laying method is that a cement layer 8 with a diameter slightly smaller than that of the main pipeline 1 is firstly made, at least three ropes are fixed on the cement layer 8, the cement layer 8 is hung to a proper position of the main pipeline 1 by the ropes, then a paraffin layer 7 is poured, and gaps between the cement layer 8 and the main pipeline 1 are filled and fixed by utilizing the fluidity and the adhesiveness of paraffin to form a new main pipe partition layer. The paraffin partition layer 5 in the branch pipeline 2 does not need to be laid again after the coal gangue dump is spontaneously combusted and melted, because the gap in the coal gangue area where spontaneous combustion occurs is filled with the grout injected during fire extinguishing before, oxygen conditions are not provided, and secondary spontaneous combustion cannot occur. The main pipe partition layer in the main pipeline 1 needs to be reset, so that the method can be reused after spontaneous combustion occurs at other positions of the gangue dump.
Further, as a specific implementation mode of the fire extinguishing method for spontaneous combustion of the coal gangue dump, the cement layer 8 is formed by proportioning 93-97% of calcium carbonate and 3-7% of silicate, the 93-97% of calcium carbonate is used for reacting with acetic acid, the 3-7% of silicate is used for shaping, and calcium acetate and carbon dioxide gas are generated after the calcium carbonate and the acetic acid react.
Further, as a specific implementation manner of the fire extinguishing method for spontaneous combustion of the coal gangue dump, the thickness of the paraffin partition layer 5, the thickness of the cement layer 8 and the thickness of the paraffin layer 7 are all 4-10 cm. Within this range, the respective effects can be achieved just without wasting the material.
Further, as a specific implementation manner of the fire extinguishing method for spontaneous combustion of the coal gangue dump, the main pipeline 1 is a seamless steel pipe for grouting, the branch pipelines 2 are alternately laid by floral tubes and steel pipes at intervals of 1m, and the main pipeline 1 is subject to a larger impact force during grouting, so that the strength requirement can be better met by using the seamless steel pipe; the branch pipelines 2 are alternately paved by adopting perforated pipes and steel pipes at intervals of 1m, so that the cost is saved, and the cost of the perforated pipes is higher than that of the steel pipes.
Further, as a specific implementation manner of the fire extinguishing method for spontaneous combustion of the gangue dump, the main temperature measuring metal wire 3 and the branch temperature measuring metal wire 4 are coated with polytetrafluoroethylene layers. The polytetrafluoroethylene layer can resist high temperature, acid and alkali, and various organic solvents, and the temperature measurement metal wire is prevented from being corroded under the long-term environmental action.
Further, as a specific implementation manner of the fire extinguishing method for spontaneous combustion of the coal gangue dump, the surface of the perforated pipe in the branch pipeline 2 is coated with a layer of ethylene propylene diene monomer. The ethylene propylene diene monomer is a low-melting-point plastic, and can be melted at high temperature to expose the holes on the perforated pipe; because the branch pipe is very long, the ignition area can be arranged on a certain section of the branch pipe, and only the through hole on the floral tube on the ignition area needs to be communicated, so that the grout can flow into the ignited coal gangue from the pipeline of the branch pipe 2, the grout can be prevented from leaking from the floral tube in the non-ignition area, the grouting material is saved, and the grouting can be carried out on the ignition area more accurately.
Further, as a specific implementation manner of the fire extinguishing method for spontaneous combustion of the coal gangue dump, an end cover is arranged on a pipe orifice at the upper end of the main pipeline 1. The end cover is arranged at the pipe orifice at the upper end of the main pipeline 1 so as to prevent foreign matters from entering the main pipeline 1 and blocking the main pipeline.
Further, as a specific embodiment of the fire extinguishing method for spontaneous combustion of the gangue dump according to the present invention, in step S1, 12 branch pipes 2 are connected to the main pipe 1 at vertical intervals of 3m along the horizontal direction; the free ends of all the branch pipelines 2 extend into a mountain body 3m away from the outer surface of the coal gangue mountain; the main pipeline 1 and the main pipeline 1, and the main pipeline 1 and the branch pipelines 2 are connected by welding, flange connection and the like; and the paraffin partition layer and the paraffin layer both adopt No. 52 paraffin. The fire extinguishing device is obtained through calculation and experiments, and the best fire extinguishing effect can be achieved by adopting the design parameters. In specific implementation, the pipe diameter of the main pipeline 1 is 12 inches or 14 inches, and the pipe diameter of the branch pipeline 2 is 4 inches, 5 inches or 6 inches. Paraffin wax number 52 has a lower melting point and is more sensitive to the increase in reaction temperature.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (10)
1. A fire extinguishing method for spontaneous combustion of a gangue dump is characterized by comprising the following steps:
s1: firstly lay the pipe network in the gangue mountain body, the pipe network includes main line (1) and branch pipeline (2), main line (1) is vertical and run through the middle part that sets up at the gangue mountain body, main line (1) is connected with 10~16 branch pipeline (2) along the horizontal direction at every interval 2.5~5m on the vertical distance, and all branch pipelines (2) on the same horizontal plane evenly arrange and form the branch pipeline layer along the circumference of main line (1), and the free end of all branch pipelines (2) all extends to in the mountain body apart from gangue mountain surface 2~4m, branch pipeline (2) are all followedThe pipeline (2) is made of a floral tube; a main temperature measuring metal wire (3) and a branch temperature measuring metal wire (4) which are communicated with each other are respectively arranged in the main pipeline (1) and the branch pipeline (2), and the branch temperature measuring metal wire (4) can detect temperature information of the specific position of the coal gangue dump and collects the temperature information to a main detection station in real time through the main temperature measuring metal wire (3); all branch pipelines (2) are provided with at least two paraffin partition layers (5) for partitioning the branch pipelines (2) along the cross section, and all paraffin partition layers (5) in the same branch pipeline are connected by a copper metal bar (6); a main pipe partition layer is arranged in the main pipeline (1) at the upper end of each branch pipe layer, and comprises a paraffin layer (7) and a cement layer (8) which are arranged up and down; numbering the branch temperature measuring metal wires (4), and numbering i from top to bottom in sequence for different branch pipeline layers connected with the main pipeline (1)1、i2、i3……ipEach branch pipeline (2) of each branch pipeline layer is respectively numbered as j1、j2、j3……jqAnd the number of the temperature measuring metal wire (4) is Apq；
S2: when it is in the first placepqWhen the temperature detected at the branch temperature measuring metal wire (4) is greater than or equal to 350 ℃, the coal gangue mountain body at the qth branch pipeline (2) of the p-th branch pipeline layer is confirmed to be spontaneously combusted, and the accurate positioning of the ignition area is realized;
s3: then, the front p layers of main pipe partition layers in the main pipeline (1) begin to be melted, each layer is formed by melting a paraffin layer (7) with hot water, then dissolving a cement layer (8) with acetic acid, and alternately using the hot water and the acetic acid for p times until the front p layers of main pipe partition layers are communicated; a paraffin wax isolating layer (5) in the qth branch pipeline (2) of the pth branch pipeline layer is melted due to the heat conduction effect of the copper metal bar (6), and then the qth branch pipeline (2) from the inlet of the main pipeline (1) to the pth branch pipeline layer is completely penetrated;
s4: and finally, performing accurate grouting on the fire area to finish the fire extinguishing work.
2. The fire extinguishing method for the spontaneous combustion of the gangue dump as claimed in claim 1, wherein in the step S1, the concrete method for laying the pipe network in the gangue dump body is as follows: when the coal gangue dump starts to be stacked, erecting a main pipeline (1) with the length of the p-th section of 2.5-5 m at the middle part of the position where the coal gangue dump is pre-stacked, then starting to stack coal gangue, when the height of the coal gangue dump is flush with the p-th main pipeline (1), connecting a branch pipeline layer of the p-th layer at the upper part of the main pipeline (1), after the branch pipeline layer of the p-th layer is connected, connecting the main pipeline (1) of the p-1 th section, then stacking coal gangue and connecting the branch pipeline layer of the p-1 th layer, and repeating the method until a pipe network is laid in the coal gangue dump.
3. The fire extinguishing method for the spontaneous combustion of the coal gangue dump as claimed in claim 2, wherein the main pipe insulating layer needs to be laid again after the coal gangue dump is penetrated by the spontaneous combustion, the laying method comprises the steps of firstly making a cement layer (8) with a diameter slightly smaller than that of the main pipeline (1), fixing at least three ropes on the cement layer, hoisting the cement layer (8) into the proper position of the main pipeline (1) by the ropes, then pouring a paraffin layer (7), and filling and fixing the main pipeline by utilizing the fluidity and the adhesiveness of the paraffin so as to form a new insulating layer by filling the gap between the cement layer (8) and the main pipeline (1).
4. The fire extinguishing method for spontaneous combustion of coal gangue dump as claimed in claim 1, 2 or 3, wherein in step S1, the cement layer (8) is prepared from 93-97% of calcium carbonate and 3-7% of silicate.
5. The fire extinguishing method for the spontaneous combustion of the gangue dump as claimed in claim 4, wherein in the step S1, the thickness of the paraffin partition layer (5), the thickness of the cement layer (8) and the thickness of the paraffin layer (7) are all 4-10 cm in the step S1.
6. The fire extinguishing method for the spontaneous combustion of the gangue dump as claimed in claim 5, wherein the main pipeline (1) is a seamless steel pipe for grouting, and the branch pipelines (2) are alternately laid by floral tubes and steel pipes at intervals of 1 m.
7. The fire extinguishing method for the spontaneous combustion of the gangue dump as claimed in claim 6, wherein the main temperature measuring metal wire (3) and the branch temperature measuring metal wires (4) are coated with polytetrafluoroethylene layers.
8. The fire extinguishing method for the spontaneous combustion of the gangue dump as claimed in claim 7, wherein the surface of the perforated pipe in the branch pipeline (2) is wrapped with a layer of ethylene propylene diene monomer.
9. The fire extinguishing method for the spontaneous combustion of the gangue dump as claimed in claim 8, wherein an end cover is arranged on a pipe orifice at the upper end of the main pipeline (1).
10. The fire extinguishing method for spontaneous combustion of gangue piles as claimed in claim 9, wherein in step S1, 12 branch pipes (2) are connected to the main pipe (1) in the horizontal direction at intervals of 3m in the vertical distance; the free ends of all branch pipelines (2) extend into a mountain body 3m away from the outer surface of the coal gangue mountain; the main pipeline (1) and the branch pipelines (2) are connected in a welding and flange connection mode; and the paraffin partition layer and the paraffin layer both adopt No. 52 paraffin.
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| CN113713293A (en) * | 2020-09-28 | 2021-11-30 | 珠海共同低碳科技股份有限公司 | Coal gangue carbon dioxide flame retardant device |
| CN113202540B (en) * | 2021-06-07 | 2023-06-16 | 太原理工大学 | Intermittent grouting fire prevention and extinguishing method for high-gas mine high-position extraction drilling site |
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| CN203008966U (en) * | 2013-01-08 | 2013-06-19 | 葛洲坝集团基础工程有限公司 | Grouting obturator |
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