Device for simulating spontaneous combustion of coal in up-down through coal seam

Abstract

The utility model discloses a device for simulating spontaneous combustion of coal in a vertically-through coal seam. The device comprises a heating source, a simulation box, a gas chromatograph and an emanometer, a first partition plate is fixed in the simulation box and divides the simulation box into a combustion chamber and a collection chamber, the combustion chamber is used for combusting the coal seam, the collection chamber is used for collecting gas, and the emanometer is used for detecting the spontaneous combustion of the coal seam. A second partition plate is fixed in the collecting chamber, the collecting chamber is divided into two identical gas collecting chambers by the second partition plate, the two gas collecting chambers are connected with the gas chromatograph and the radon measuring instrument through pipelines, and the gas chromatograph and the radon measuring instrument are used for detecting gas in the gas collecting chambers. The device for simulating coal spontaneous combustion of the up-down through coal seam can simulate the spontaneous combustion process of the up-down through coal seam by simulating coal spontaneous combustion of the up-down through coal seam.

Description

TECHNICAL FIELD

[0001] The utility model relates to coal seam spontaneous combustion simulation device technical field especially relates to a simulation upper and lower through coal seam coal spontaneous combustion device. BACKGROUND

[0002] Coal spontaneous combustion is one of the common safety hazards in the coal industry. According to statistics, about 85% of underground coal mines in China are threatened by coal spontaneous combustion, and the proportion of coal spontaneous combustion fire in goaf is as high as 60%, with annual economic loss exceeding 20 billion yuan. In coal mining, the problem of coal spontaneous combustion in close distance coal seams through goaf is extremely complex due to multi-layer space connection. Multi-channel air leakage leads to unpredictable oxygen diffusion path, complex path, and continuous change of oxidation zone, which significantly increases the risk of spontaneous combustion. The heat generated by broken residual coal in the oxidation process is transferred and accumulated between different coal seams, forming a high temperature area that is difficult to locate. In addition, the recovery working face is easy to cause coal spontaneous combustion in adjacent goaf, which makes the coal spontaneous combustion prevention and control work extremely difficult.

[0003] The existing coal seam spontaneous combustion experimental device is designed for single goaf, which is difficult to simulate the coupling effect of air leakage, heat transfer and gas diffusion in real scene, resulting in insufficient precision of traditional monitoring methods (such as gas detection and temperature field analysis) for capturing characteristic gas and locating fire source, and low early warning reliability.

[0004] Therefore, it is necessary to provide a simulation upper and lower through coal seam coal spontaneous combustion device to solve the above technical problems. UTILITY MODEL CONTENT

[0005] In view of the above situation, in order to overcome the defects of the prior art, the utility model provides a simulation upper and lower through coal seam coal spontaneous combustion device which can simulate the spontaneous combustion process of upper and lower through coal seams.

[0006] In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

[0007] The simulation up and down through coal seam coal spontaneous combustion device, including: heating source, simulation box, gas chromatograph and radon detector, the first baffle is fixed in the simulation box, the first baffle divides the simulation box into combustion chamber and collection chamber two parts, the combustion chamber is used for burning coal seam, the collection chamber is used for collecting gas, the second baffle is fixed in the collection chamber, and the second baffle divides the collection chamber into two identical gas collection chambers, the two gas collection chambers are connected with the gas chromatograph and the radon detector through pipelines, the gas chromatograph and the radon detector detect the gas in the gas collection chamber, the combustion chamber is provided with at least two coal seam boxes and at least one rock plate, the rock plate has certain fissure, so that part of the gas realizes up and down through, the coal seam box is internally provided with coal, and forms a simulated coal seam, two air pumps are mounted on one side of the first baffle, the two air pumps are located in the corresponding gas collection chamber respectively, and the air inlet of the air pump extends into the combustion chamber, a plurality of heating rods are fixedly installed on one side of the simulation box, the plurality of heating rods are located in the combustion chamber, and the plurality of heating rods are inserted into the corresponding coal seam box respectively for heating the coal seam, the number of heating rods located in the two coal seam boxes is the same, and the plurality of heating rods are connected with the heating source through wires, and the heating source is used for controlling the temperature of the heating rod.

[0008] Preferably, the coal seam box comprises a box body and a side cover plate, the upper and lower surfaces of the box body are both in a mesh structure, and the side cover plate is bound to the box body by iron wire.

[0009] Preferably, a plurality of mounting pipes are fixed on one side of the box body, the mounting pipes are used for mounting the heating rods, the mounting pipes are in a mesh structure, and an inlet is further arranged on one side of the box body and communicates with the mounting pipes.

[0010] Preferably, the two sides of the coal seam box and the rock plate are provided with clamping grooves, a plurality of clamping strips matched with the clamping grooves are arranged in the combustion chamber, and the plurality of clamping strips are fixed on the inner wall of one side of the simulation box and one side of the first baffle respectively.

[0011] Preferably, the simulation up and down through coal seam coal spontaneous combustion device further comprises a temperature patrol instrument and a plurality of temperature sensors, the temperature sensor can be a K-type thermocouple, the plurality of temperature sensors are electrically connected with the temperature patrol instrument, the temperature sensors are inserted into the top and bottom of the simulation box, and part of the temperature sensors are directly inserted into the simulated coal seam in the coal seam box, so as to detect the temperature of the coal seam.

[0012] Preferably, a sealing ring is sleeved on the temperature sensor, and the sealing ring plays a sealing effect when the temperature sensor is mounted on the simulation box.

[0013] Preferably, the system also includes a gas source, which is connected to the simulation chamber via two pipelines. The gas source supplies oxygen and nitrogen to the simulation chamber through the pipelines respectively. When the coal seam needs to be ignited in the combustion chamber, oxygen is introduced into the simulation chamber. When the fire in the coal seam needs to be extinguished, nitrogen is introduced into the combustion chamber. A pressure gauge and a flow meter are installed on both gas pipelines to stabilize the pressure and flow of the gas.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] (1) The simulation of the spontaneous combustion process of coal seam was realized, and the changes in the types, concentrations and radon evolution rate of index gases such as CO and CO2 generated during the spontaneous combustion process of coal under the influence of different environmental factors (such as oxidation temperature, oxygen concentration, ventilation volume, etc.) were monitored in real time.

[0016] (2) Based on the correlation between the concentration of indicator gas and the radon release rate and the temperature field, it is possible to determine whether there is spontaneous combustion of coal, and to determine the specific coal seam fire source location by using the concentration of indicator gas. Combined with the radon release rate, the stage of spontaneous combustion of coal seam can be judged in a comprehensive manner, so as to achieve the purpose of monitoring and early warning and provide a scientific basis for the prevention and control of coal fire disasters.

[0017] (3) The combustion chamber is equipped with at least two coal seam boxes and at least one rock plate. The rock plate has certain cracks, which allows some gas to pass through vertically, making it closer to the actual coal seam situation.

[0018] (4) The gas source is connected to the simulation box through two pipelines, which respectively supply oxygen and nitrogen to the simulation box. When it is necessary to ignite the coal seam, oxygen is introduced into the simulation box; when it is necessary to extinguish the fire in the coal seam, nitrogen is introduced into the combustion chamber, thereby achieving the fire extinguishing effect. Attached Figure Description

[0019] Figure 1 A schematic diagram of the structure of the simulated self-ignition device for a vertically connected coal seam provided by this utility model.

[0020] Figure 2 This is a cross-sectional view of the simulation chamber.

[0021] Figure 3 This is a schematic diagram of the structure of a simulated box without the coal seam box and rock slab installed.

[0022] Figure 4 This is a schematic diagram of the coal seam box structure;

[0023] Figure 5 This is a schematic diagram of the coal seam box structure;

[0024] Figure 6 This is a schematic diagram of the coal seam box structure;

[0025] Figure 7A schematic diagram of the structure of a simulation box for installing coal seam boxes and rock slabs;

[0026] Figure 8 This is a schematic diagram of the assembly of the temperature sensor and the simulation box.

[0027] The corresponding names of the attached figures are as follows: 1. Gas source; 2. Pressure gauge; 3. Flow meter; 4. Heating source; 5. Simulation chamber; 6. Gas chromatograph; 7. Radon analyzer; 8. Computer; 9. Power supply; 10. Temperature monitoring instrument; 11. First partition; 12. Second partition; 13. Gas collection chamber; 14. Coal seam box; 141. Box body; 142. Side cover plate; 15. Rock slab; 16. Heating rod; 17. Air pump; 18. Installation pipe; 19. Inlet; 20. Temperature sensor; 21. Locking strip; 22. Locking groove; 23. Sealing ring. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments. The embodiments of the present invention include, but are not limited to, the following embodiments.

[0029] Example 1:

[0030] like Figures 1-2As shown, the device for simulating spontaneous combustion of coal in a vertically connected coal seam provided by this utility model includes: a heating source 4, a simulation chamber 5, a gas chromatograph 6, and a radon detector 7. A first partition 11 is fixed inside the simulation chamber 5, dividing it into a combustion chamber and a collection chamber. The combustion chamber is used to burn the coal seam, and the collection chamber is used to collect gas. A second partition 12 is fixed inside the collection chamber, separating it into two identical gas collection chambers 13. Both gas collection chambers 13 are connected to... The gas is connected to the gas chromatograph 6 and the radon detector 7 via pipelines. The gas chromatograph 6 and the radon detector 7 detect the gas in the gas collection chamber 13. During the spontaneous combustion of the coal seam, the gases generated are collected, and the changes in the types, concentrations, and radon release rates of indicator gases such as CO and CO2, generated during the spontaneous combustion process are monitored in real time under the influence of different environmental factors such as oxidation temperature, oxygen concentration, and ventilation volume. Based on the correlation between the concentration of indicator gases, the radon release rate, and the temperature field, it can be determined whether spontaneous combustion of coal occurs. The concentration of indicator gases is used to determine the specific ignition point of the coal seam fire source, and the radon release rate is combined to comprehensively determine the stage of spontaneous combustion of the coal seam, achieving the purpose of monitoring and early warning, and providing a scientific basis for the prevention and control of coal fire disasters. The combustion chamber contains at least two coal seam boxes 14 and at least one rock plate 15. The rock plate 15 has certain cracks to allow some gas to flow vertically. The coal seam boxes 14 are filled with coal to form a simulated coal seam. Two suction pumps 17 are installed on one side of the first partition 11. The two suction pumps 17 are located in corresponding gas collection chambers 13, and their inlets extend into the combustion chamber. When the simulated coal seam in the combustion chamber burns, the suction pumps 17 start to transport the gas generated by the combustion of the simulated coal seam to the gas collection chambers 13. Multiple heating rods 16 are fixedly installed on one side of the simulation box 5. The multiple heating rods 16 are all located in the combustion chamber and are inserted into the corresponding coal seam boxes 14 to heat the coal seam. The two coal seam boxes 14 contain the same number of heating rods 16. The multiple heating rods 16 are connected to the heating source 4 via wires. The heating source 4 is used to control the temperature of the heating rods 16. During the experiment, one coal seam is ignited first. After the experiment is completed, the other coal seam is ignited. Specifically, the heating source 4 first controls the temperature of one heating rod 16 to rise so as to ignite one of the coal seams. The ignited coal seam will produce gas. At this time, two air pumps 11 are started at the same time to collect the gas. During the gas collection process, due to the cracks in the rock slab 15, a small portion of the gas from the burning side will be transported to the unburned side and enter different gas collection boxes 13 under the action of the air pumps 11. The gas chromatograph 6 and the radon detector 7 detect the gas in the gas collection box 13.

[0031] Example 2:

[0032] likeFigure 4 As shown, the coal seam box 14 includes a box body 141 and a side cover plate 142. The upper and lower surfaces of the box body 141 are mesh structures, which facilitate gas flow. The side cover plate 142 is tied to the box body 141 with iron wire. The two are fixed by iron wire, which makes the installation and disassembly of the side cover plate 142 simple and convenient, and the cost is low.

[0033] Furthermore, multiple mounting tubes 18 are fixed on one side of the housing 141. The mounting tubes 18 are used to install heating rods 16. The mounting tubes 18 have a mesh structure. When the heating rods 16 are inserted into the mounting tubes 18, the heating rods 16 are loosely connected to the mesh structure of the mounting tubes 18. The reason for designing the mounting tubes 18 as mesh structures is to ensure that the heating rods 16 can heat and ignite the coal seam. An inlet 19 is also provided on one side of the housing 141. The inlet 19 is connected to the mounting tubes 18. The setting of the inlet 19 makes it easier to insert the heating rods 16 into the mounting tubes 18. In use, the coal seam box 14 needs to be taken out of the simulation box 5 to load coal first, and then put back into the simulation box 5 after loading the coal. The above design is adapted to the situation where the coal seam box 14 is easy to take out and install.

[0034] Example 3:

[0035] like Figure 4 As shown, both sides of the coal seam box 14 and the rock plate 15 are provided with slots 22. The combustion chamber is provided with multiple locking strips 21 that are adapted to the slots 22. These locking strips 21 are respectively fixed to one inner wall of the simulation box 5 and one side of the first partition 11. When it is necessary to install the coal seam box 14 or the rock plate 15 inside the simulation box 15, the slots 22 are engaged with the locking strips 21, and the coal seam box 14 or the rock plate 15 is pushed. It should be noted that a sealed door is provided on one side of the simulation box 5; the sealed door needs to be opened before operation.

[0036] Example 4

[0037] like Figure 1 and 3 As shown, the simulated coal seam spontaneous combustion device also includes a temperature monitoring instrument 10 and multiple temperature sensors 20. The temperature sensors 20 can be K-type thermocouples. All of the multiple temperature sensors 20 are electrically connected to the temperature monitoring instrument 10. The temperature sensors 20 are inserted into the top and bottom of the simulation box 5, and part of them are directly inserted into the simulated coal seam inside the coal seam box 14 to detect the temperature of the coal seam. With the cooperation of the temperature monitoring instrument 10 and multiple temperature sensors 20, the real-time temperature inside the coal seam can be obtained.

[0038] Furthermore, a sealing ring 23 is fitted onto the temperature sensor 20, and when the temperature sensor 20 is installed on the simulation box 5, the sealing ring 23 has a sealing effect.

[0039] Example 5

[0040] like Figure 1 As shown, it also includes a gas source 1, which is connected to the simulation chamber 5 through two pipelines. The gas source supplies oxygen and nitrogen to the simulation chamber 5 through the pipelines respectively. When the coal seam needs to be ignited in the combustion chamber, oxygen is introduced into the simulation chamber 5. When the fire in the coal seam needs to be extinguished, nitrogen is introduced into the combustion chamber, thereby achieving the fire extinguishing effect. A pressure regulator 2 and a flow regulator 3 are installed on both gas pipelines to stabilize the pressure and flow of the gas.

[0041] Working principle: When in use, first load an appropriate amount of coal into the coal seam box 14, then install the coal seam box 14 and the rock plate 15 into the simulation box 5. During the installation process, ensure that multiple heating rods 16 are inserted into the corresponding installation pipes 18. Then close the sealed door of the simulation box 5, and then install multiple temperature sensors 20 onto the top and bottom of the simulation box 5. When installing, you can rotate the temperature sensor 20 left and right by hand to insert it downwards. Do not use force to insert it to avoid damaging the temperature sensor 20. After all the temperature sensors 20 are installed, connect the pipes of each part. At the same time, connect the heating source 4 to the power supply 9, and connect the gas chromatograph 6 and the radon detector 7 to the computer 8 to complete the installation of each part.

[0042] After all parts are installed, gas source 1 and heating source 4 are started. Gas source 1 introduces oxygen into simulation chamber 5, and heating source 4 raises the temperature of heating rod 16 to heat the simulated coal seam until it spontaneously combusts. Temperature sensor 20 monitors the temperature of each part of the coal seam in real time. When a part reaches the spontaneous combustion temperature, two vacuum pumps 17 are started simultaneously. Vacuum pumps 17 transport the gas produced by the combustion of the simulated coal seam to gas collection chamber 13. Gas chromatograph 6 and radon detector 7 detect the gas. When it is necessary to stop the combustion, oxygen supply to the combustion chamber is stopped and nitrogen is supplied to the combustion chamber for fire extinguishing. After the fire is extinguished, another heating rod 16 is used to ignite the coal seam again, and then two more simulated coal seams are ignited. Multiple experiments are required for verification during the experiment.

Claims

1. A device for simulating spontaneous combustion of coal through a coal seam, characterized in that, The utility model relates to a simulation upper and lower through coal seam coal spontaneous combustion device, including: Heating source (4), simulation box (5), gas chromatograph (6) and radon detector (7), first baffle (11) is fixed in the simulation box (5) inside, the simulation box (5) is divided into combustion chamber and collection room two parts with the first baffle (11), second baffle (12) is fixed in the collection room inside, and second baffle (12) divides the collection room and separates two identical gas collection chambers (13), two the gas collection chamber (13) is connected with the gas chromatograph (6) and the radon detector (7) through the pipeline, at least two coal seam box (14) and at least one rock plate (15) are provided in the combustion chamber, the coal seam box (14) is equipped with coal in the inside, two air pumps (17) are installed on the side of first baffle (11), two the air pump (17) is located in the corresponding gas collection chamber (13) respectively, and the air inlet of air pump (17) extends to the combustion chamber, a plurality of heating rods (16) are fixedly installed on the side of simulation box (5), a plurality of the heating rod (16) are located in the combustion chamber, and a plurality of heating rods (16) are inserted into the inside of corresponding coal seam box (14) respectively.

2. The device for simulating spontaneous combustion of coal in seam according to claim 1, characterized in that, The coal seam box (14) includes a box body (141) and a side cover plate (142), the upper and lower surfaces of the box body (141) are both net structures, and the side cover plate (142) is bound on the box body (141) by iron wire.

3. The device according to claim 2, wherein, A plurality of mounting pipes (18) are fixed on one side of the box body (141), the mounting pipes (18) are net structures, and an inlet (19) is further arranged on one side of the box body (141), the inlet (19) is in communication with the mounting pipes (18).

4. The device according to claim 1, wherein, Both sides of the coal seam box (14) and the rock plate (15) are provided with clamping grooves (22), a plurality of clamping strips (21) matched with the clamping grooves (22) are arranged in the combustion chamber, and the clamping strips (21) are fixed on the inner wall of one side of the simulation box (5) and the side of the first baffle (11) respectively.

5. The device according to claim 1, wherein, The simulation upper and lower through coal seam coal spontaneous combustion device further includes a temperature patrol instrument (10) and a plurality of temperature sensors (20), the temperature sensors (20) are electrically connected with the temperature patrol instrument (10), the temperature sensors (20) are inserted into the top and bottom of the simulation box (5), and part of the temperature sensors (20) are directly inserted into the simulation coal seam in the coal seam box (14).

6. The device according to claim 5, wherein, A sealing ring (23) is sleeved on the temperature sensor (20).

7. The device according to claim 1, wherein the device is characterized by: The simulation upper and lower through coal seam coal spontaneous combustion device further includes a gas source (1), the gas source (1) is communicated with the simulation box (5) through two pipelines, the gas source (1) delivers oxygen and nitrogen into the simulation box (5) through the pipelines respectively, and the two pipelines are provided with a pressure stabilizer (2) and a flow stabilizer (3).

Images