Goaf coal spontaneous combustion fire extinguishing experiment device and coal spontaneous combustion fire extinguishing simulation method

Abstract

The embodiment of the invention discloses a goaf coal spontaneous combustion fire extinguishing experiment device and a coal spontaneous combustion simulation fire extinguishing method.The goaf coal spontaneous combustion fire extinguishing experiment device comprises a box body, a heating assembly, a fire extinguishing assembly, an oxygen supply part and a detection assembly, and the heating assembly comprises a plurality of heating points; a coal body can be arranged in the box body, oxygen is supplied into the box body through the oxygen supply assembly, and fracture oxygen supply in an actual air mining area is simulated; part of the heating points are randomly triggered, so that the temperature of the coal body is increased, and the ignition point of the air mining area is randomized; after spontaneous combustion of the coal body, the fire extinguishing assembly extinguishes the spontaneous combustion coal body through the multiple injection ports, the production reality can be better met, the fire extinguishing effect of high-low position grouting can be simulated, a basis can be provided for fire extinguishing parameters of spontaneous combustion of the coal body in actual production, and the safety of actual production can be improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of coal technology, and more particularly to a goaf coal spontaneous combustion fire extinguishing experimental device and a simulated coal spontaneous combustion fire extinguishing method. Background Art

[0002] Spontaneous combustion of coal is one of the main disasters threatening the safe production of coal mines. Fires caused by spontaneous combustion of coal account for more than 90% of the total number of mine fires. Especially for goafs, the accumulation of coal in goafs is distributed in planes with different particle sizes, and there are a large number of cracks in the collapse zone above the coal. The cracks become oxygen storage and flow channels, resulting in the random and multi-source characteristics of spontaneous combustion in goafs. The experimental equipment in traditional technology cannot simulate the spontaneous combustion state of coal in goafs, and cannot well simulate the full life cycle process from the generation to the extinguishing of coal fires. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0004] To this end, a first aspect of the present invention provides a goaf area coal spontaneous combustion fire extinguishing experimental device.

[0005] A second aspect of the present invention provides a method for extinguishing fire by simulating spontaneous combustion of coal in goaf.

[0006] In view of this, according to a first aspect of an embodiment of the present application, a goaf coal spontaneous combustion extinguishing experimental device is proposed, comprising:

[0007] Box;

[0008] A heating component, the heating component is arranged in the box, the heating component comprises a plurality of heating points, and the plurality of heating points are evenly distributed in the box;

[0009] A fire extinguishing component, wherein the box body is provided with a plurality of injection ports distributed along the height direction, and the output end of the fire extinguishing component is connected to the plurality of injection ports;

[0010] An oxygen supply member connected to the top of the box;

[0011] A detection component is connected to the box and is used to obtain temperature information inside the box.

[0012] In a feasible implementation manner, the fire extinguishing assembly includes:

[0013] Inhibited slurry bottle;

[0014] A grouting pump, the output end of the inhibitory slurry bottle is connected to the grouting pump;

[0015] A plurality of injection pipes, the input ends of the injection pipes are connected to the grouting pumps, and each injection port is connected to one of the injection pipes.

[0016] In a feasible implementation manner, the oxygen supply component includes:

[0017] Oxygen cylinders;

[0018] an oxygen supply pipe connected to the oxygen cylinder;

[0019] An injection pipe, a through hole is opened on the top of the box body, one end of the injection pipe is connected to the oxygen supply pipe, and the other end extends into the box body.

[0020] In a feasible implementation manner, the detection component includes:

[0021] A plurality of thermocouples, wherein the plurality of thermocouples are distributed in the box;

[0022] An exhaust port, wherein the exhaust port is provided on the box body;

[0023] A gas component analyzer and an exhaust pipe, wherein the gas component analyzer is connected to the box through the exhaust pipe and the exhaust port.

[0024] In a feasible implementation manner, the heating component includes:

[0025] A shell, the shell being disposed in the box;

[0026] A plurality of heating plates and a controller, wherein the plurality of heating plates are arranged in the shell, and the controller is connected to the plurality of heating plates and is used for controlling each heating plate to start up independently to form a plurality of heating points.

[0027] According to a second aspect of the embodiment of the present application, a method for simulating spontaneous combustion of coal in goaf is proposed, which is applied to the experimental device for spontaneous combustion of coal in goaf as described in any of the above technical solutions. The method for simulating spontaneous combustion of coal in goaf includes:

[0028] Step 201: distributing the coal in the box;

[0029] Step 202: Open the oxygen supply member to supply oxygen into the box to simulate oxygen inflow into the cracks of the goaf;

[0030] Step 203: randomly turning on some of the plurality of heating points to simulate spontaneous combustion of coal;

[0031] Step 204: extinguishing the spontaneously combusting coal body by using a fire extinguishing component;

[0032] Step 205: Count the temperature change field in the box from the stage of coal spontaneous combustion to fire extinguishing.

[0033] In a feasible implementation manner, the step of randomly opening some of the plurality of heating points to simulate the spontaneous combustion of the coal body comprises:

[0034] Randomly start some of the plurality of heating points, and control the started plurality of heating points to heat at different temperature rise gradients, so as to promote the spontaneous combustion of the coal in the box;

[0035] The step of extinguishing the spontaneously combusting coal body by means of the fire extinguishing assembly comprises:

[0036] At the same time, the inhibitory slurry is injected into the box through multiple injection ports to extinguish the fire.

[0037] In a feasible implementation manner, the method for simulating spontaneous combustion of coal in goaf area also includes:

[0038] Step 206: Repeat steps 201 to 205 to perform multiple groups of spontaneous combustion and fire extinguishing simulation experiments;

[0039] Step 207: Determine a recommended fire extinguishing method based on the results of multiple groups of spontaneous combustion and fire extinguishing simulation experiments;

[0040] In the process of different groups of spontaneous combustion and fire extinguishing simulation experiments, the fire extinguishing component in step 204 extinguishes the spontaneously combusting coal in different ways.

[0041] In a feasible implementation manner, the step of counting the temperature change field in the box from the coal spontaneous combustion to the fire extinguishing stage includes:

[0042] The time zone of the coal spontaneous combustion stage is divided into multiple sub-spontaneous combustion time zones, and the relationship between the average temperature in each sub-spontaneous combustion time zone and the spatial distribution in the box is counted to obtain the temperature distribution trend of the sub-time domain spontaneous combustion space;

[0043] The time zone of the fire extinguishing stage is divided into multiple sub-fire extinguishing time zones, and the relationship between the average temperature in each sub-fire extinguishing time zone and the spatial distribution in the box is counted to obtain the temperature distribution trend of the sub-time domain fire extinguishing space;

[0044] The temperature distribution trend of the self-ignition space in the sub-time domain and the temperature distribution trend of the fire extinguishing space in the sub-time domain are taken as the temperature variation field.

[0045] In a feasible implementation manner, the step of determining the recommended fire extinguishing method based on the results of different groups of experiments includes:

[0046] Based on the temperature distribution trend of the spontaneous combustion space in the sub-time domain in each spontaneous combustion and fire extinguishing simulation experiment, the spontaneous combustion state diffusion trend parameters and the spontaneous combustion peak temperature information are determined;

[0047] Determine the fire extinguishing efficiency parameters based on the sub-time domain fire extinguishing space temperature distribution trend in each spontaneous combustion fire extinguishing simulation experiment;

[0048] Determine the fire extinguishing efficiency information of each spontaneous combustion extinguishing simulation experiment based on the spontaneous combustion state diffusion trend parameter, spontaneous combustion peak temperature information and fire extinguishing efficiency parameter in each spontaneous combustion extinguishing simulation experiment;

[0049] Based on the fire extinguishing efficiency information, recommended fire extinguishing parameters of the fire extinguishing assembly are determined.

[0050] Compared with the prior art, the present invention has at least the following beneficial effects:

[0051] The goaf coal spontaneous combustion and fire extinguishing experimental device provided in the embodiment of the present application includes a box body, a heating component, a fire extinguishing component, an oxygen supply component and a detection component, wherein the heating component includes a plurality of heating points, based on which, in the process of simulating coal spontaneous combustion and fire extinguishing through the goaf coal spontaneous combustion and fire extinguishing experimental device, the coal body can be set in the box body, and oxygen can be supplied into the box body through the oxygen supply component to simulate the oxygen supply in the cracks in the actual goaf; then, some of the multiple heating points are randomly triggered to increase the temperature of the coal body to simulate the randomization of the ignition points in the goaf; after the coal body spontaneously combusts, the fire extinguishing component extinguishes the spontaneously combusted coal body through a plurality of injection ports, which can be more in line with the actual production and simulate the fire extinguishing effect of high and low position grouting, based on which the effect of coal spontaneous combustion and fire extinguishing in the goaf can be simulated more in line with the actual production, and in this process, the temperature change in the box body is detected, based on which the process of coal spontaneous combustion and fire extinguishing can be determined, which can provide a basis for the fire extinguishing parameters of coal spontaneous combustion in actual production, and can improve the safety of actual production.

[0052] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0054] Figure 1 A schematic structural diagram of a goaf coal spontaneous combustion and fire extinguishing experimental device according to an embodiment of the present application;

[0055] Figure 2A schematic structural diagram of a heating assembly of a goaf coal spontaneous combustion and fire extinguishing experimental device according to an embodiment of the present application;

[0056] Figure 3 A schematic structural diagram of a detection component of a goaf coal spontaneous combustion extinguishing experimental device according to an embodiment of the present application;

[0057] Figure 4 A schematic flowchart of the steps of another method for simulating spontaneous combustion of coal in goaf provided in the present application.

[0058] in, Figures 1 to 4 The corresponding relationship between the reference numerals and the component names is as follows:

[0059] 110 box body, 120 heating component, 130 fire extinguishing component, 140 oxygen supply component, 150 detection component;

[0060] 111 injection port, 121 shell, 122 heating plate, 123 controller, 131 inhibitor slurry bottle, 132 injection pipeline, 141 oxygen cylinder, 142 oxygen supply pipe, 143 injection pipe, 151 thermocouple, 152 exhaust port, 153 gas composition analyzer, 154 exhaust pipe. DETAILED DESCRIPTION

[0061] In the following description, a large number of specific details are given to provide a more thorough understanding of the technical solutions provided by the present invention. However, it is obvious to those skilled in the art that the technical solutions provided by the present invention can be implemented without one or more of these details.

[0062] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of the features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0063] Now, exemplary embodiments according to the present invention will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in a variety of different forms and should not be interpreted as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided to make the disclosure of the present invention thorough and complete, and to fully convey the concept of these exemplary embodiments to those of ordinary skill in the art.

[0064] like Figures 1 to 3As shown, according to the first aspect of the embodiment of the present application, a goaf coal spontaneous combustion fire extinguishing experimental device is proposed, including: a box body 110; a heating component 120, the heating component 120 is arranged in the box body 110, the heating component 120 includes multiple heating points, and the multiple heating points are evenly distributed in the box body 110; a fire extinguishing component 130, the box body 110 is provided with multiple injection ports 111 distributed along the height direction, and the output end of the fire extinguishing component 130 is connected to the multiple injection ports 111; an oxygen supply component 140, the oxygen supply component 140 is connected to the top of the box body 110; a detection component 150, the detection component 150 is connected to the box body 110, and is used to obtain temperature information in the box body 110.

[0065] The goaf coal spontaneous combustion and fire extinguishing experimental device provided in the embodiment of the present application includes a box 110, a heating component 120, a fire extinguishing component 130, an oxygen supply component 140 and a detection component 150, wherein the heating component 120 includes a plurality of heating points. Based on this, in the process of simulating the spontaneous combustion and fire extinguishing of the coal body through the goaf coal spontaneous combustion and fire extinguishing experimental device, the coal body can be set in the box 110, and oxygen can be supplied to the box 110 through the oxygen supply component to simulate the oxygen supply in the fissures in the actual goaf; then, some of the plurality of heating points are randomly triggered to make the coal body The temperature rises, simulating the randomization of the ignition point in the empty mining area; after the coal body spontaneously combusts, the fire extinguishing assembly 130 extinguishes the spontaneously combusting coal body through multiple injection ports 111, which can be more in line with actual production and simulate the fire extinguishing effect of high and low position grouting. Based on this, the spontaneous combustion and fire extinguishing effects of the coal body in the empty mining area can be simulated more in line with actual production. In this process, the temperature changes in the box 110 are detected, and the process of coal body spontaneous combustion and fire extinguishing can be determined based on this. This can provide a basis for the fire extinguishing parameters of coal body spontaneous combustion in actual production, and can improve the safety of actual production.

[0066] like Figures 1 to 3 As shown, in a feasible embodiment, the fire extinguishing assembly 130 includes: a retardant slurry bottle 131; a grouting pump, the output end of the retardant slurry bottle 131 is connected to the grouting pump; a plurality of injection pipes 132, the input end of the injection pipe 132 is connected to the grouting pump, and each injection port 111 is connected to an injection pipe 132.

[0067] In this technical solution, the structural composition of the fire extinguishing component 130 is further provided. The fire extinguishing component 130 includes a retardant slurry bottle 131, a grouting pump and a plurality of injection pipes 132. Based on this, in the process of extinguishing the self-igniting coal body in the box 110 through the fire extinguishing component 130, the retardant slurry can be output through the retardant slurry bottle 131, and the retardant slurry is pumped to the plurality of injection pipes 132 by the grouting pump, and finally injected into the box 110 through the plurality of injection ports 111, which can better simulate the actual situation of grouting fire extinguishing underground, improve the similarity, and better simulate the whole life cycle process from the generation to the extinguishing of coal fire.

[0068] like Figures 1 to 3 As shown, in a feasible embodiment, the oxygen supply member 140 includes: an oxygen cylinder 141; an oxygen supply pipe 142, the oxygen supply pipe 142 is connected to the oxygen cylinder 141; an injection pipe 143, a through hole is opened on the top of the box body 110, one end of the injection pipe 143 is connected to the oxygen supply pipe 142, and the other end extends into the box body 110.

[0069] In this technical solution, the structural composition of the oxygen supply component 140 is further provided. The oxygen supply component 140 may include an oxygen cylinder 141, an oxygen supply pipe 142 and an injection pipe 143. During the simulation of spontaneous combustion of the coal body, the oxygen cylinder 141 may be opened to output oxygen, which passes through the oxygen supply pipe 142 and then is injected into the box body 110 via the injection pipe 143. This can better simulate the actual fissure oxygen supply in the goaf, making the goaf coal spontaneous combustion and fire extinguishing experimental device closer to actual production.

[0070] like Figures 1 to 3 As shown, in a feasible embodiment, the detection component 150 includes: a plurality of thermocouples 151, which are distributed in the box body 110; an exhaust port 152, which is opened on the box body 110; a gas composition analyzer 153 and an exhaust pipe 154, and the gas composition analyzer 153 is connected to the box body 110 through the exhaust pipe 154 and the exhaust port 152.

[0071] In this technical solution, the structural composition of the detection component 150 is further provided. The detection component 150 may include a plurality of thermocouples 151. By distributing the plurality of thermocouples 151 inside the box 110, the temperatures of different spaces in the box 110 can be detected, and the temperature detection can be made more accurate.

[0072] In this technical solution, the detection component 150 also includes an exhaust port 152, a gas composition analyzer 153 and an exhaust pipe 154. Based on this, the gas generated in the box 110 can be discharged through the setting of the exhaust port 152 and the exhaust pipe 154, and the exhausted gas can be analyzed by the gas composition analyzer 153. Before spontaneous combustion, the changes in the characteristic gas of coal spontaneous combustion can be collected to determine the cause of spontaneous combustion. After the fire is extinguished, the exhaust gas formed by the combustion can be analyzed, and then the state of coal combustion can be analyzed.

[0073] In a feasible embodiment, the heating assembly 120 includes: a shell 121, the shell 121 is arranged in the box 110; a plurality of heating disks 122 and a controller 123, the plurality of heating disks 122 are arranged in the shell 121, and the controller 123 is connected to the plurality of heating disks 122 for controlling each heating disk 122 to start independently to form a plurality of heating points.

[0074] In this technical solution, the structural composition of the heating component 120 is further provided. The heating component 120 may include a shell 121, multiple heating disks 122 and a controller 123. Based on this, the operation of the heating disks 122 can be independently controlled by the controller 123, so that independently controlled heating points can be formed. When the coal body is heated, the spontaneous combustion of the coal body in the empty mining area can be better simulated.

[0075] Example

[0076] like Figures 1 to 3 As shown, the goaf coal spontaneous combustion fire extinguishing experimental device provided by the embodiment of the present application includes: a constant temperature box 110, a multi-source heating device is arranged at the bottom of the box 110 as a heating component 120, the heating component 120 has multiple heating points, the box 110 is connected to the injection pipe 143, the injection pipeline 132, and the exhaust pipe 154; the oxygen cylinder 141 is connected to the box 110 through the regulating valve, and the inhibitor slurry bottle 131 is passed into the box 110 through the regulating valve and the grouting pump. The coal body is heated at multiple heating points by the heating component 120, the thermocouple 151 measures the coal body temperature and constructs a three-dimensional temperature field. When the coal body spontaneous combustion temperature reaches the fire extinguishing requirement, the control console sends a fire extinguishing signal, and three grouting modes of high, medium and low can be selected to perform grouting fire extinguishing. When the slurry in the box 110 is full, stop grouting, and record the coal body cooling process and the gas changes generated in the whole process from coal spontaneous combustion to heating.

[0077] The goaf coal spontaneous combustion and fire extinguishing experimental device provided in the embodiment of the present application takes into account that the coal residue in the goaf is accumulated and distributed in different particle sizes, and there are a large number of cracks in the collapse zone above the coal residue, and the cracks become oxygen storage and flow channels. The box 110 can simulate the three-dimensional spatial structure of the mining field, and the top of the box 110 has an outlet of the injection pipe 143, which can simulate the oxygen supply in the goaf. Compared with the cylinder of the experimental device in the prior art, it is more similar to the actual situation, and at the same time, the broken rock blocks can be directly covered on the accumulated coal residue to simulate the actual rock collapse in the goaf.

[0078] The goaf coal spontaneous combustion fire extinguishing experimental device provided in the embodiment of the present application adopts a multi-point heating method because the heat source in the goaf is not a single existence, and can be set by single or multiple spontaneous combustion positions, temperature gradient and other functions. The spontaneous combustion device in traditional technology idealizes the spontaneous combustion of the coal as a single heat source. Compared with the randomization and multi-source of the ignition points in the entire goaf, this device can meet the multi-heat source mode of the mining field, making the spontaneous combustion of the coal more in line with the actual situation on site.

[0079] The goaf coal spontaneous combustion fire extinguishing experimental device provided in the embodiment of the present application has multiple injection ports 111 arranged along the height direction of the box 110. By controlling the high, medium and low position grouting valve switches, the actual on-site grouting process often adopts multi-hole grouting to carry out coal mine fire prevention and extinguishing work. Multi-hole grouting has high efficiency and wide coverage, making the slurry better for the residual coal. Most of the existing experimental devices adopt single-hole grouting, and the simulation effect is poor, which is inconsistent with the grouting fire prevention and extinguishing in the actual production process. There are errors in the experimental simulation and the expected fire extinguishing effect cannot be achieved.

[0080] The goaf coal spontaneous combustion and fire extinguishing experimental device provided in the embodiment of the present application can fully simulate the combustion effects of different heat sources of the goaf coal body; the space device simulates the underground mining field space environment; the top of the box 110 has a fissure vent to simulate the air supply of the real mining field fissure; the box 110 simulates the actual underground grouting fire prevention and extinguishing on one side, and the grouting pipe connects the grouting pump and the inhibitor material bottle. The thermocouple 151 collects the temperature of different positions and depths of the coal body in the device to construct a three-dimensional temperature field. The gas analysis module can collect changes in the characteristic gas of coal spontaneous combustion.

[0081] like Figure 4 As shown, according to the second aspect of the embodiment of the present application, a method for simulating spontaneous combustion of coal in goaf is proposed, which is applied to the experimental device for spontaneous combustion of coal in goaf of any of the above technical solutions. The method for simulating spontaneous combustion of coal in goaf includes:

[0082] Step 201: Distribute the coal in the box;

[0083] Step 202: Open the oxygen supply part to supply oxygen into the box to simulate oxygen inflow into the cracks of the goaf;

[0084] Step 203: randomly turning on some of the multiple heating points to simulate the spontaneous combustion of the coal body;

[0085] Step 204: extinguishing the spontaneously combusting coal body by using a fire extinguishing component;

[0086] Step 205: Count the temperature change field in the box from the stage of coal spontaneous combustion to fire extinguishing.

[0087] The method for simulating spontaneous combustion of coal in goaf provided in the embodiment of the present application is applied to the experimental device for spontaneous combustion of coal in goaf of any of the above-mentioned technical solutions. Therefore, the method for simulating spontaneous combustion of coal in goaf has all the beneficial effects of the experimental device for spontaneous combustion of coal in goaf of the above-mentioned technical solutions.

[0088] The embodiment of the present application provides a method for simulating spontaneous combustion of coal in goafs and extinguishing fire. In the process of executing the method for simulating spontaneous combustion of coal in goafs and extinguishing fire through an experimental device for spontaneous combustion of coal in goafs and extinguishing fire, the coal body can be set in a box, and oxygen can be supplied into the box through an oxygen supply assembly to simulate the oxygen supply in the fissures in the actual goafs; then, some of the multiple heating points are randomly triggered to increase the temperature of the coal body to simulate the randomization of the ignition points in the goafs; after the coal body spontaneously combusts, the fire extinguishing assembly extinguishes the spontaneously combusted coal body through multiple injection ports, which can be more in line with production practice and simulate the fire extinguishing effect of high and low position grouting. Based on this, the spontaneous combustion and fire extinguishing effects of coal bodies in goafs can be simulated more in line with production practice. In this process, the temperature changes in the box are detected, and the process of spontaneous combustion and fire extinguishing of the coal body can be determined based on this, which can provide a basis for the fire extinguishing parameters of spontaneous combustion of coal bodies in actual production and can improve the safety of actual production.

[0089] The method for simulating spontaneous combustion of coal in goaf provided in the embodiment of the present application can count the temperature change field in the box from the spontaneous combustion of the coal body to the fire extinguishing stage, based on which the entire process of spontaneous combustion and fire extinguishing can be known, which can provide a basis for actual production. For example, based on the spontaneous combustion process in actual production, the basic conditions for the formation of spontaneous combustion can be suppressed by adjusting parameters to reduce the probability of spontaneous combustion; based on the changes in the temperature field during the fire extinguishing stage, the fire extinguishing parameters can be corrected to improve the fire extinguishing efficiency.

[0090] In a feasible embodiment, the step of randomly turning on some of the multiple heating points to simulate the spontaneous combustion of the coal body includes: randomly turning on some of the multiple heating points, and controlling the multiple heating points to be heated at different temperature rising gradients to induce the coal body in the box to spontaneously combust; the step of extinguishing the spontaneously combusting coal body by a fire extinguishing assembly includes: simultaneously injecting inhibitor slurry into the box through multiple injection ports to extinguish the fire.

[0091] In this technical solution, specific steps are further provided for randomly turning on some of the multiple heating points to simulate the spontaneous combustion of the coal body, controlling the multiple heating points to heat with different temperature rising gradients, and promoting the spontaneous combustion of the coal body in the box. In other words, the temperature rising trends of different areas of the coal body are different, which can better simulate the spontaneous combustion state of the coal body and make the method of simulating spontaneous combustion of coal in goaf area closer to actual production.

[0092] In this technical solution, a step is further provided for extinguishing the spontaneously combusting coal body through a fire extinguishing assembly. At the same time, inhibitory slurry is injected into the box through multiple injection ports to extinguish the fire, simulating the grouting trend of high and low position grouting in the actual production process, which can make the simulated goaf coal spontaneous combustion extinguishing method closer to actual production.

[0093] In a feasible implementation, the method for simulating spontaneous combustion of coal in goaf areas also includes: step 206: repeating steps 201 to 205 to conduct multiple groups of spontaneous combustion and fire extinguishing simulation experiments; step 207: determining a recommended fire extinguishing method based on the results of the multiple groups of spontaneous combustion and fire extinguishing simulation experiments; wherein, during different groups of spontaneous combustion and fire extinguishing simulation experiments, the fire extinguishing component of step 204 extinguishes the spontaneously combusting coal body in different ways.

[0094] In this technical solution, a single execution of steps 201 to 205 can be considered to have completed a spontaneous combustion and fire extinguishing simulation experiment. During the execution of the method, steps 201 to 205 can also be repeatedly executed to conduct multiple spontaneous combustion and fire extinguishing simulation experiments. The results of each spontaneous combustion and fire extinguishing simulation experiment are then counted, and the optimal or better fire extinguishing scheme is obtained from multiple results. The fire extinguishing method is recommended, which can improve the fire extinguishing efficiency of coal spontaneous combustion in the actual production process and make the actual production safer.

[0095] In a feasible implementation, the step of counting the temperature change field in the box from the spontaneous combustion of the coal body to the fire extinguishing stage includes: dividing the time zone of the spontaneous combustion stage of the coal body into multiple sub-spontaneous combustion time zones, counting the relationship between the average temperature in each sub-spontaneous combustion time zone and the spatial distribution in the box, and obtaining the temperature distribution trend of the spontaneous combustion space in the sub-time domain; dividing the time zone of the fire extinguishing stage into multiple sub-fire extinguishing time zones, counting the relationship between the average temperature in each sub-fire extinguishing time zone and the spatial distribution in the box, and obtaining the temperature distribution trend of the fire extinguishing space in the sub-time domain; using the temperature distribution trend of the spontaneous combustion space in the sub-time domain and the temperature distribution trend of the fire extinguishing space in the sub-time domain as the temperature change field.

[0096] In this technical solution, a specific method for determining the temperature change field is further provided. In the process of determining the temperature change field, the entire process is divided into two stages, the first stage is the coal body spontaneous combustion stage, and the second stage is the fire extinguishing stage. For the coal body spontaneous combustion stage, the entire stage is divided into multiple sub-spontaneous combustion time zones, and then the relationship between the temperature in each sub-spontaneous combustion time zone and the spatial distribution in the box is counted, so that a data set can be obtained, which includes the relationship between time, space and temperature in the spontaneous combustion stage. For the fire extinguishing stage, the fire extinguishing stage can be uniformly divided into multiple sub-fire extinguishing time zones, and then the relationship between the temperature in each sub-fire extinguishing time zone and the spatial distribution in the box is counted, so that a data set can be obtained, which includes the relationship between time, space and temperature in the fire extinguishing stage. By determining the temperature distribution trend of the sub-time domain spontaneous combustion space and the temperature distribution trend of the sub-time domain fire extinguishing space, the entire process from spontaneous combustion to fire extinguishing can be digitized and counted.

[0097] In a feasible implementation, based on the results of different groups of experiments, the step of determining the recommended fire extinguishing method includes: determining the spontaneous combustion state diffusion trend parameters and spontaneous combustion peak temperature information based on the sub-time domain spontaneous combustion space temperature distribution trend in each spontaneous combustion extinguishing simulation experiment; determining the fire extinguishing efficiency parameters based on the sub-time domain fire extinguishing space temperature distribution trend in each spontaneous combustion extinguishing simulation experiment; determining the fire extinguishing efficiency information of each spontaneous combustion extinguishing simulation experiment based on the spontaneous combustion state diffusion trend parameters, spontaneous combustion peak temperature information and fire extinguishing efficiency parameters in each spontaneous combustion extinguishing simulation experiment; and determining the recommended fire extinguishing parameters of the fire extinguishing component based on the fire extinguishing efficiency information.

[0098] In this technical solution, on the basis of obtaining the temperature distribution trend of the spontaneous combustion space in the sub-time domain and the temperature distribution trend of the fire extinguishing space in the sub-time domain, a step of determining the recommended fire extinguishing method based on the results of different groups of experiments is further provided. Through the temperature distribution trend of the spontaneous combustion space in the sub-time domain and the temperature distribution trend of the fire extinguishing space in the sub-time domain, the spontaneous combustion state diffusion trend parameter, the spontaneous combustion peak temperature information and the fire extinguishing efficiency parameter can be determined respectively. The spontaneous combustion state diffusion trend parameter and the spontaneous combustion peak temperature information characterize the influence of the multiple heating points randomly turned on on the spontaneous combustion phenomenon, and demonstrate the intensity of the spontaneous combustion phenomenon, while the fire extinguishing efficiency parameter demonstrates the efficiency of the fire extinguishing in the spontaneous combustion fire extinguishing simulation experiment. Then, based on the spontaneous combustion state diffusion trend parameter, the spontaneous combustion peak temperature information and the fire extinguishing efficiency parameter in each spontaneous combustion fire extinguishing simulation experiment, the fire extinguishing efficiency information of each spontaneous combustion fire extinguishing simulation experiment is determined. Finally, the fire extinguishing component fire extinguishing parameters of the fire extinguishing method of the spontaneous combustion fire extinguishing simulation experiment corresponding to the highest fire extinguishing efficiency information can be used as the recommended fire extinguishing strategy, which can improve the fire extinguishing efficiency.

[0099] By executing the simulated coal spontaneous combustion extinguishing method provided in the embodiment of the present application and performing multiple spontaneous combustion extinguishing simulation experiments, the most effective extinguishing scheme under different spontaneous combustion states can be obtained, which can provide a large amount of data support for actual production. For example, when there are multiple ignition sources in the empty mining area at the same time, the pressure of the inhibitory slurry output from the injection port at the highest point is controlled to be the largest, and then the output pressure of the inhibitory slurry is gradually reduced as the injection point height decreases, which can achieve the best fire extinguishing effect.

[0100] In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise clearly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0101] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front” and “back” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, cannot be understood as a limitation on the present invention.

[0102] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0103] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A goaf coal spontaneous combustion fire extinguishing experimental device, characterized in that: include: Box; A heating component, the heating component is arranged in the box, the heating component comprises a plurality of heating points, and the plurality of heating points are evenly distributed in the box; A fire extinguishing component, wherein the box body is provided with a plurality of injection ports distributed along the height direction, and the output end of the fire extinguishing component is connected to the plurality of injection ports; An oxygen supply member connected to the top of the box; A detection component is connected to the box and is used to obtain temperature information inside the box.

2. The goaf coal spontaneous combustion extinguishing experimental device according to claim 1 is characterized in that: The fire extinguishing assembly comprises: Inhibited slurry bottle; A grouting pump, the output end of the inhibitory slurry bottle is connected to the grouting pump; A plurality of injection pipes, the input ends of the injection pipes are connected to the grouting pumps, and each injection port is connected to one of the injection pipes.

3. The goaf coal spontaneous combustion fire extinguishing experimental device according to claim 1 is characterized in that: The oxygen supply member comprises: Oxygen cylinders; an oxygen supply pipe connected to the oxygen cylinder; An injection pipe, a through hole is opened on the top of the box body, one end of the injection pipe is connected to the oxygen supply pipe, and the other end extends into the box body.

4. The goaf coal spontaneous combustion fire extinguishing experimental device according to claim 1 is characterized in that: The detection component comprises: A plurality of thermocouples, wherein the plurality of thermocouples are distributed in the box; An exhaust port, wherein the exhaust port is provided on the box body; A gas component analyzer and an exhaust pipe, wherein the gas component analyzer is connected to the box through the exhaust pipe and the exhaust port.

5. The goaf coal spontaneous combustion fire extinguishing experimental device according to claim 1 is characterized in that: The heating assembly comprises: A shell, the shell being disposed in the box; A plurality of heating plates and a controller, wherein the plurality of heating plates are arranged in the shell, and the controller is connected to the plurality of heating plates and is used for controlling each heating plate to start up independently to form a plurality of heating points.

6. A method for simulating spontaneous combustion of coal in goaf, characterized in that: The goaf coal spontaneous combustion and fire extinguishing experimental device applied to any one of claims 1 to 5, the method for simulating goaf coal spontaneous combustion and fire extinguishing comprises: Step 201: distributing the coal in the box; Step 202: Open the oxygen supply member to supply oxygen into the box to simulate oxygen inflow into the cracks of the goaf; Step 203: randomly turning on some of the plurality of heating points to simulate spontaneous combustion of coal; Step 204: extinguishing the spontaneously combusting coal body by using a fire extinguishing component; Step 205: Count the temperature change field in the box from the stage of coal spontaneous combustion to fire extinguishing.

7. The method for extinguishing spontaneous combustion of coal in a simulated goaf according to claim 6, characterized in that: The step of randomly opening some of the plurality of heating points to simulate the spontaneous combustion of the coal body comprises: Randomly start some of the plurality of heating points, and control the started plurality of heating points to heat at different temperature rise gradients, so as to promote the spontaneous combustion of the coal in the box; The step of extinguishing the spontaneously combusting coal body by means of the fire extinguishing assembly comprises: At the same time, the inhibitory slurry is injected into the box through multiple injection ports to extinguish the fire.

8. The method for extinguishing spontaneous combustion of coal in a simulated goaf according to claim 6, characterized in that: Also includes: Step 206: Repeat steps 201 to 205 to perform multiple groups of spontaneous combustion and fire extinguishing simulation experiments; Step 207: Determine a recommended fire extinguishing method based on the results of multiple groups of spontaneous combustion and fire extinguishing simulation experiments; In the process of different groups of spontaneous combustion and fire extinguishing simulation experiments, the fire extinguishing component in step 204 extinguishes the spontaneously combusting coal in different ways.

9. The method for extinguishing spontaneous combustion of coal in a simulated goaf according to claim 8, characterized in that: The step of counting the temperature change field in the box from the coal spontaneous combustion to the fire extinguishing stage comprises: The time zone of the coal spontaneous combustion stage is divided into multiple sub-spontaneous combustion time zones, and the relationship between the average temperature in each sub-spontaneous combustion time zone and the spatial distribution in the box is counted to obtain the temperature distribution trend of the sub-time domain spontaneous combustion space; The time zone of the fire extinguishing stage is divided into multiple sub-fire extinguishing time zones, and the relationship between the average temperature in each sub-fire extinguishing time zone and the spatial distribution in the box is counted to obtain the temperature distribution trend of the sub-time domain fire extinguishing space; The temperature distribution trend of the self-ignition space in the sub-time domain and the temperature distribution trend of the fire extinguishing space in the sub-time domain are taken as the temperature variation field.

10. The method for extinguishing spontaneous combustion of coal in a simulated goaf area according to claim 9, characterized in that: The steps of determining the recommended fire extinguishing method based on the results of different groups of experiments include: Based on the temperature distribution trend of the spontaneous combustion space in the sub-time domain in each spontaneous combustion and fire extinguishing simulation experiment, the spontaneous combustion state diffusion trend parameters and the spontaneous combustion peak temperature information are determined; Determine the fire extinguishing efficiency parameters based on the sub-time domain fire extinguishing space temperature distribution trend in each spontaneous combustion fire extinguishing simulation experiment; Determine the fire extinguishing efficiency information of each spontaneous combustion extinguishing simulation experiment based on the spontaneous combustion state diffusion trend parameter, spontaneous combustion peak temperature information and fire extinguishing efficiency parameter in each spontaneous combustion extinguishing simulation experiment; Based on the fire extinguishing efficiency information, recommended fire extinguishing parameters of the fire extinguishing assembly are determined.

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