阅读说明：本技术 一种煤的高温氧化特性及引燃/爆瓦斯的实验模拟装置及方法 (Experimental simulation device and method for high-temperature oxidation characteristic and ignition/explosion gas of coal ) 是由 杨胜强 周步壮 杨锴 蒋孝元 宋万新 胡新成 蔡佳文 许芹 汤宗情 周全超 张东 于 2020-11-04 设计创作，主要内容包括：一种煤的高温氧化特性及引燃/爆瓦斯的实验模拟装置及方法,装置包括定量配比供气装置、燃烧反应炉、卸压保护装置、计算机自动监测监控装置；将煤样放入燃烧反应炉内打开各开关,观察各参数运行情况,并观察压力、流量数值的变化；实时采集实验数据；若发现温度传感器和压力传感器显示燃烧反应炉内的温度和压力骤然上升,并伴有剧烈声响,则说明燃烧炉内发生爆炸反应,记录此时温度和压力作为发生煤自燃能够引燃/爆瓦斯的条件,为井下现场调整风量和温度提供参考,反应产生的强烈气压通过加长钢制管和泄压阀排出；实现煤自燃引燃/爆瓦斯,真实模拟灾害发生情况,为矿井防治煤自燃与瓦斯的耦合灾害提供理论指导和参考,降低发生瓦斯爆炸的概率。(An experimental simulation device and method of high-temperature oxidation characteristic and ignition/explosion gas of coal, the apparatus includes the quantitative proportioning air feeder, burns the reaction furnace, pressure relief protection device, computer automatic monitoring device; putting the coal sample into a combustion reaction furnace, opening each switch, observing the running condition of each parameter, and observing the change of the pressure and flow values; collecting experimental data in real time; if the temperature sensor and the pressure sensor show that the temperature and the pressure in the combustion reaction furnace suddenly rise and are accompanied by violent sounds, the explosion reaction in the combustion furnace is shown, the temperature and the pressure at the moment are recorded as conditions for igniting/exploding gas due to spontaneous combustion of coal, reference is provided for underground on-site air quantity and temperature adjustment, and strong air pressure generated by the reaction is discharged through the lengthened steel pipe and the pressure release valve; the method has the advantages of realizing spontaneous combustion ignition/gas explosion of the coal, truly simulating the occurrence condition of disasters, providing theoretical guidance and reference for preventing and controlling the coupling disasters of spontaneous combustion of the coal and the gas in the mine, and reducing the probability of gas explosion.)

1. An experimental simulation device for high-temperature oxidation characteristic and ignition/explosion gas of coal is characterized in that: comprises a quantitative proportioning gas supply device, a combustion reaction furnace (4), a pressure relief protection device and a computer automatic monitoring device;

the quantitative proportioning gas supply device comprises a methane gas cylinder (2), a dry air gas cylinder (1) and a gas storage tank (3), the gas storage tank (3) is respectively connected with the methane gas cylinder (2) and the dry air gas cylinder (1) through two guide pipes, and one side of the gas storage tank (3) is connected with a gas inlet of the combustion reaction furnace (4) through one guide pipe;

the combustion reaction furnace (4) comprises a heat-insulation explosion-proof sealed cavity (15) which is transversely arranged, a heat-insulation explosion-proof cover (17) is arranged at one end of an opening of the heat-insulation explosion-proof sealed cavity (15), an air outlet (20) and an air inlet (19) are arranged on the upper outer edge and the lower outer edge of one side of the opening, heat-insulation layers (16) are laid around the inner part of the heat-insulation explosion-proof sealed cavity (15), and an electric heater (12), a temperature sensor (13) and a pressure sensor (14) which extend into the heat-insulation explosion-proof sealed cavity are respectively arranged outside the heat-insulation explosion;

the pressure relief protection device comprises an elongated steel pipe (7) connected to the combustion reaction furnace (4) and a pressure relief valve (8) connected with the elongated steel pipe (7);

the computer automatic monitoring device comprises a plurality of electromagnetic valves, flow sensors, pressure sensors, temperature sensors and an operation desk connected with the components, wherein the operation desk comprises a computer (6) and a controller (5), and the operation desk displays monitoring data in real time and is opened and closed quickly to complete the operation of setting temperature and controlling gas to enter and exit.

2. The experimental simulation device for high temperature oxidation characteristics and ignition/explosion gas of coal as claimed in claim 1, wherein: the heat-insulation explosion-proof cover (17) is hermetically connected with the heat-insulation explosion-proof sealed cavity (15) through a bolt (18).

3. The experimental simulation device for high temperature oxidation characteristics and ignition/explosion gas of coal as claimed in claim 1, wherein: the plurality of electromagnetic valves, the flow sensors, the pressure sensors and the temperature sensors comprise first electromagnetic valves (9-1), second electromagnetic valves (9-2) and third electromagnetic valves (9-3) which are arranged on three guide pipes in the quantitative proportioning air supply device, first flow sensors (10-1), second flow sensors (10-2) and third flow sensors (10-3), first pressure sensors (11-1), second pressure sensors (11-2) and third pressure sensors (11-3), and further comprise temperature sensors (13) and pressure sensors (14) in the combustion reaction furnace (4).

4. The experimental simulation method of the experimental simulation device for high temperature oxidation characteristics and ignition/explosion gas of coal as claimed in claim 3, characterized by comprising the steps of:

the first step is as follows: presetting the gas mixing proportion and the total mixed gas amount required by the experiment, checking the gas tightness of a gas transmission pipeline, opening a pressure relief valve (8) and preparing to start the experiment;

the second step is that: putting the coal sample into a combustion reaction furnace (4), and tightly connecting a heat-insulating explosion-proof cover (17) and a heat-insulating explosion-proof sealed cavity (15) together through a bolt (18);

the third step: opening the computer (6), starting the control machine (5), observing whether the operation program is normally displayed, if the operation program can be normally displayed, continuing to perform the next step, otherwise, firstly closing the machine, and continuing to perform the next step after the fault is eliminated;

the fourth step: opening switch valves (1-1,2-1) of a dry air gas cylinder (1) and a methane gas cylinder (2), then opening a first electromagnetic valve (9-1) and a second electromagnetic valve (9-2) on a computer (6) to enable gas to flow into a gas storage tank (3), and simultaneously opening a first flow sensor (10-1), a second flow sensor (10-2), a first pressure sensor (11-1) and a second pressure sensor (11-2) in sequence to observe the running conditions of all parameters;

the fifth step: after the amount of the mixed gas in the gas storage tank (3) reaches an experimental set value, closing the first electromagnetic valve (9-1), the second electromagnetic valve (9-2) and opening the third electromagnetic valve (9-3) through the computer (6), so that the mixed gas flows into the combustion reaction furnace (4), simultaneously opening the third flow sensor (10-3) and the third pressure sensor (11-3), and observing the change of the pressure and flow numerical values;

and a sixth step: setting the temperature required by the experiment through a computer (6), heating the interior of the combustion reaction furnace through an electric heater (12), turning on a temperature sensor (13) and a pressure sensor (14), and observing the running condition of parameters;

the seventh step: observing the reaction progress on a computer (6), and collecting experimental data in real time; if the temperature sensor (13) and the pressure sensor (14) show that the temperature and the pressure in the combustion reaction furnace (4) rise suddenly and are accompanied by violent sounds, the explosion reaction is generated in the combustion furnace (4), the temperature and the pressure are recorded as conditions that spontaneous combustion of coal can ignite/explode gas, reference is provided for underground on-site air quantity and temperature adjustment, and the violent air pressure generated by the reaction is discharged through an elongated steel pipe (7) and a pressure release valve (8); the method has the advantages of realizing spontaneous combustion ignition/gas explosion of the coal, truly simulating the occurrence condition of disasters, providing theoretical guidance and reference for preventing and controlling the coupling disasters of spontaneous combustion of the coal and the gas in the mine, and reducing the probability of gas explosion.

Technical Field

The invention relates to a device and a method for experimental simulation of high-temperature oxidation characteristic and ignition/explosion gas of coal, in particular to an experimental simulation device and an experimental simulation method which are suitable for the oxidation characteristic of coal after spontaneous combustion enters a high-temperature stage in the process of extracting pressure relief gas in a coal mine underground and can possibly cause gas combustion or explosion.

Background

79% of mined coal seams in China have spontaneous combustion tendencies, the gas content is increased and the coal seam breakage degree is increased along with the transfer of mining from mines to deep coal seams, and the coexistence of gas and coal spontaneous combustion is two major disasters seriously threatening the safety production of mines. In the process of controlling gas, air leakage air flow formed by pressure relief gas extraction is increased, the coal spontaneous combustion danger is aggravated, and meanwhile, the coal spontaneous combustion oxidation is heated to a high-temperature state until the coal spontaneous combustion oxidation air flow becomes an ignition source for gas combustion or explosion, so that the coal spontaneous combustion ignition/gas explosion accident is caused. The coal spontaneous combustion ignition/gas explosion accident brings huge injury to people, and causes great economic loss and bad influence to countries and enterprises.

At present, in the process of exploiting a deep high-gas coal seam, research on a gas and coal spontaneous combustion coupling disaster mechanism is incomplete, a simulation experiment device for coal spontaneous combustion ignition/explosion gas is blank, the situation of coal spontaneous combustion ignition/explosion gas under a coal mine is difficult to truly reproduce by a traditional numerical simulation research mode, and setting of coal spontaneous combustion parameters and gas combustion or explosion parameters is too ideal, so that the research on the gas and coal spontaneous combustion coupling disaster mechanism is very important by independently designing and building a set of experiment simulation device and method for coal high-temperature oxidation characteristics and ignition/explosion gas and combining with corresponding computer numerical simulation experiment results.

Disclosure of Invention

The technical problem is as follows: the invention aims to overcome the defects in the prior art, and provides an experimental simulation device and method for simulating the high-temperature oxidation characteristic and ignition/explosion gas of coal under the condition of gas extraction, which can truly reproduce the disaster-causing process of gas combustion or explosion disaster accidents caused by coal spontaneous combustion under a coal mine, thereby more scientifically guiding the cooperative prevention and control of the gas and coal spontaneous combustion disasters.

The technical scheme is as follows: the invention relates to an experimental simulation device for high-temperature oxidation characteristics and ignition/explosion gas of coal, which comprises a quantitative proportioning gas supply device, a combustion reaction furnace, a pressure relief protection device and a computer automatic monitoring and monitoring device;

the quantitative proportioning gas supply device comprises a methane gas cylinder, a dry air gas cylinder and a gas storage tank, the gas storage tank is respectively connected with the methane gas cylinder and the dry air gas cylinder through two guide pipes, and one side of the gas storage tank is connected with a gas inlet of the combustion reaction furnace through one guide pipe;

the combustion reaction furnace comprises a heat-insulation explosion-proof sealed cavity body which is transversely arranged, a heat-insulation explosion-proof cover is arranged at one end of an opening of the heat-insulation explosion-proof sealed cavity body, an air outlet and an air inlet are arranged on the upper outer edge and the lower outer edge of one side of the opening, heat-insulation layers are laid around the inside of the heat-insulation explosion-proof sealed cavity body, and an electric heater, a temperature sensor and a pressure sensor which extend into the heat-insulation explosion-proof sealed cavity body are respectively arranged outside the heat;

the pressure relief protection device comprises an elongated steel pipe connected to the combustion reaction furnace and a pressure relief valve connected with the elongated steel pipe;

the computer automatic monitoring device comprises a plurality of electromagnetic valves, flow sensors, pressure sensors, temperature sensors and an operation desk connected with the components, wherein the operation desk comprises a computer and a controller, and the operation desk displays monitoring data in real time and is opened and closed quickly to complete the operation of setting temperature and controlling gas to enter and exit.

The heat-insulation explosion-proof cover and the heat-insulation explosion-proof sealing cavity are hermetically connected through a bolt.

The plurality of electromagnetic valves, the flow sensors, the pressure sensors and the temperature sensors comprise first electromagnetic valves, second electromagnetic valves and third electromagnetic valves which are arranged on three guide pipes in the quantitative proportioning gas supply device, first flow sensors, second flow sensors and third flow sensors, first pressure sensors, second pressure sensors and third pressure sensors, and further comprise temperature sensors and pressure sensors of the combustion reaction furnace.

The experimental simulation method using the experimental simulation device for the high-temperature oxidation characteristic and ignition/explosion gas of the coal comprises the following steps:

the first step is as follows: presetting the gas mixing proportion and the total mixed gas amount required by the experiment, checking the gas tightness of a gas transmission pipeline, opening a pressure relief valve, and preparing to start the experiment;

the second step is that: putting the coal sample into a combustion reaction furnace, and tightly connecting the heat-insulation explosion-proof cover and the heat-insulation explosion-proof sealed cavity together through bolts;

the third step: opening the computer, starting the control machine, observing whether the operation program is normally displayed, if the operation program can be normally displayed, continuing to perform the next step, otherwise, firstly closing the machine, and continuing to perform the next step after the fault is eliminated;

the fourth step: opening switch valves of a dry air cylinder and a methane cylinder, then opening a first electromagnetic valve and a second electromagnetic valve on a computer to enable gas to flow into a gas storage tank, and simultaneously opening a first flow sensor, a second flow sensor, a first pressure sensor and a second pressure sensor in sequence to observe the running conditions of all parameters;

the fifth step: after the amount of the mixed gas in the gas storage tank reaches an experimental set value, closing the first electromagnetic valve and the second electromagnetic valve through the computer, opening the third electromagnetic valve to enable the mixed gas to flow into the combustion reaction furnace, simultaneously opening the third flow sensor and the third pressure sensor, and observing the change of the pressure and flow values;

and a sixth step: setting the temperature and the heating rate required by the experiment through a computer, heating the interior of the combustion reaction furnace through an electric heater, turning on a temperature sensor and a pressure sensor, and observing the running condition of parameters;

the seventh step: observing the reaction progress on a computer, and collecting experimental data in real time; if the temperature sensor and the pressure sensor show that the temperature and the pressure in the combustion reaction furnace suddenly rise and are accompanied by violent sounds, the explosion reaction in the combustion furnace is shown, the temperature and the pressure at the moment are recorded as conditions for igniting/exploding gas due to spontaneous combustion of coal, reference is provided for underground on-site air quantity and temperature adjustment, and strong air pressure generated by the reaction is discharged through the lengthened steel pipe and the pressure release valve; the method has the advantages of realizing spontaneous combustion ignition/gas explosion of the coal, truly simulating the occurrence condition of disasters, providing theoretical guidance and reference for preventing and controlling the coupling disasters of spontaneous combustion of the coal and the gas in the mine, and reducing the probability of gas explosion.

Has the advantages that: by adopting the technical scheme, the invention is based on gas and coal spontaneous combustion coupling disaster accidents and is used for researching the occurrence mechanism of gas combustion (explosion) caused by coal spontaneous combustion, thereby more truly simulating the underground coal spontaneous combustion ignition/gas explosion field condition, perfecting the gas and coal spontaneous combustion coupling disaster-causing theory, having simple structure, convenient operation and good use effect, having wide practicability in the technical field and having the following main advantages:

1) a experiment table is built by adopting a similar theory, the disaster causing process of spontaneous combustion ignition/gas explosion of coal in the gas extraction process is simulated to the maximum extent, compared with simple theoretical analysis and numerical simulation, the reduction degree is higher, and the authenticity, the accuracy and the reliability of experimental data can be effectively improved.

2) The computer automatic monitoring device is arranged, so that the real-time change of specific data in the experimental process can be visually seen, and the visibility is improved; meanwhile, necessary operations of experiments, such as starting (quickly closing) the device, setting temperature and controlling gas to enter and exit, can be directly performed on the computer, accidental injury caused by contact of operators and the experiment table in the experiment process is avoided, and operability, simplicity and safety of the experiments are greatly improved.

3) The gas outlet is arranged in the combustion chamber, so that gas generated in the coal spontaneous combustion ignition/explosion gas experiment process can be taken out at any time, the component change of the gas can be analyzed in real time, the continuity of the experiment device is improved, and the change process of the coal spontaneous combustion ignition/explosion gas can be observed comprehensively from a temperature field, a pressure field and a gas field.

Drawings

FIG. 1 is a schematic diagram of the apparatus of the present invention.

FIG. 2 is a schematic view of the combustion reactor of FIG. 1.

In the figure: the system comprises a dry air cylinder 1, a methane cylinder 2, a methane cylinder 3, a gas storage tank 4, a combustion reaction furnace 5, a controller 6, a computer 7, an elongated steel pipe 8, a pressure release valve 9, a first electromagnetic valve 9, a first flow sensor 10, a first pressure sensor 11, a second electromagnetic valve 9, a second flow sensor 10, a second pressure sensor 11, a second pressure sensor 9, a third electromagnetic valve 9, a third flow sensor 10, a third pressure sensor 11, a third pressure sensor 3, an electric heater 12, a temperature sensor 13 and a pressure sensor 14. 15-heat insulation explosion-proof sealed cavity, 16-heat insulation layer, 17-heat insulation explosion-proof cover, 18-bolt, 19-air inlet, 20-air outlet.

Detailed Description

The invention will be further described with reference to examples in the drawings to which:

the invention relates to an experimental simulation device for high-temperature oxidation characteristic and ignition/explosion gas of coal, which mainly comprises a quantitative proportioning gas supply device, a combustion reaction furnace 4, a pressure relief protection device and a computer automatic monitoring and monitoring device;

the quantitative proportioning gas supply device comprises a methane gas cylinder 2, a dry air gas cylinder 1 and a gas storage tank 3, wherein the gas storage tank 3 is respectively connected with the methane gas cylinder 2 and the dry air gas cylinder 1 through two guide pipes, and one side of the gas storage tank 3 is connected with a gas inlet of the combustion reaction furnace 4 through one guide pipe;

the combustion reaction furnace 4 comprises a heat-insulation explosion-proof sealed cavity 15 which is transversely arranged, a heat-insulation explosion-proof cover 17 is arranged at one end of an opening of the heat-insulation explosion-proof sealed cavity 15, an air outlet 20 and an air inlet 19 are arranged at the upper outer edge and the lower outer edge of one side of the opening, heat-insulation layers 16 are respectively paved at the periphery inside the heat-insulation explosion-proof sealed cavity 15, and an electric heater 12, a temperature sensor 13 and a pressure sensor 14 which extend into the heat-insulation explosion-proof sealed cavity are respectively arranged outside the heat-insulation; the heat-insulating explosion-proof cover 17 and the heat-insulating explosion-proof sealed cavity 15 are hermetically connected through a bolt 18.

The pressure relief protection device comprises an elongated steel pipe 7 connected to the combustion reaction furnace 4 and a pressure relief valve 8 connected with the elongated steel pipe 7;

the computer automatic monitoring device comprises a plurality of electromagnetic valves, flow sensors, pressure sensors, temperature sensors and an operation desk connected with the components, wherein the operation desk comprises a computer 6 and a controller 5, and the operation desk displays monitoring data in real time and is opened and closed quickly to complete the operation of setting temperature and controlling gas to enter and exit. The electromagnetic valves, the flow sensors, the pressure sensors and the temperature sensors comprise a first electromagnetic valve 9-1, a second electromagnetic valve 9-2 and a third electromagnetic valve 9-3 which are arranged on three guide pipes in the quantitative proportioning gas supply device, a first flow sensor 10-1, a second flow sensor 10-2, a third flow sensor 10-3, a first pressure sensor 11-1, a second pressure sensor 11-2 and a third pressure sensor 11-3, and further comprise a temperature sensor 13 and a pressure sensor 14 in the combustion reaction furnace 4.

The experimental simulation method using the experimental simulation device for the high-temperature oxidation characteristic and the ignition/explosion gas of the coal comprises the following specific steps:

the first step is as follows: presetting the gas mixing proportion and the total mixed gas amount required by the experiment, checking the gas tightness of a gas transmission pipeline, opening a pressure relief valve 8, and preparing to start the experiment;

the second step is that: putting the coal sample into a combustion reaction furnace 4, and tightly connecting a heat-insulating explosion-proof cover 17 and a heat-insulating explosion-proof sealed cavity 15 together through a bolt 18;

the third step: opening the computer 6, starting the control machine 5, observing whether the operation program is normally displayed, if the operation program can be normally displayed, continuing to perform the next step, otherwise, firstly closing the machine, and continuing to perform the next step after the fault is eliminated;

the fourth step: opening switching valves 1-1 and 2-1 of a dry air gas cylinder 1 and a methane gas cylinder 2, then opening a first electromagnetic valve 9-1 and a second electromagnetic valve 9-2 on a computer 6 to enable gas to flow into a gas storage tank 3, and simultaneously opening a first flow sensor 10-1, a second flow sensor 10-2, a first pressure sensor 11-1 and a second pressure sensor 11-2 in sequence to observe the running conditions of all parameters;

the fifth step: considering the real environment of the left coal in the goaf and the explosion concentration limit of methane of 5-16%, dry air and methane are used as mixed gas source, the methane concentration range is designed to be 0-45%, the corresponding oxygen concentration range is 21-11.55%, according to different experimental requirements, the computer 6 and the controller 5 are used for controlling the output flow (ml/min) of the first flow sensor 10-1 and the second flow sensor 10-2, after the amount of the mixed gas in the gas storage tank 3 reaches the experimental set value, the computer 6 closes the first electromagnetic valve 9-1, the second electromagnetic valve 9-2 and opens the third electromagnetic valve 9-3 to make the mixed gas flow into the combustion reaction furnace 4, simultaneously, opening a third flow sensor 10-3 and a third pressure sensor 11-3, and observing the change of the pressure and flow values;

and a sixth step: according to the experimental design scheme, the temperature and the heating rate required by the experiment are set through the computer 6, the electric heater 12 is controlled by the controller 5 to heat the interior of the combustion reaction furnace, the heating interval of the heater is 25-800 ℃, the minimum heating rate is 1 ℃/min, when the temperature reaches a set value, the temperature sensor 13 and the pressure sensor 14 are turned on, and the parameter operation condition is observed;

the seventh step: observing the reaction progress on the computer 6, and collecting experimental data in real time; if the temperature sensor 13 and the pressure sensor 14 show that the temperature and the pressure in the combustion reaction furnace 4 suddenly rise and are accompanied by violent sounds, the explosion reaction in the combustion furnace 4 is shown, the temperature and the pressure at the moment are recorded as conditions for igniting/exploding gas due to spontaneous combustion of coal, reference is provided for underground on-site air quantity and temperature adjustment, and the violent air pressure generated by the reaction is discharged through the lengthened steel pipe 7 and the pressure release valve 8; the method has the advantages of realizing spontaneous combustion ignition/gas explosion of the coal, truly simulating the occurrence condition of disasters, providing theoretical guidance and reference for preventing and controlling the coupling disasters of spontaneous combustion of the coal and the gas in the mine, and reducing the probability of gas explosion.