CN212228894U - Real-time monitoring device for oxygen concentration in coal spontaneous combustion process - Google Patents
Real-time monitoring device for oxygen concentration in coal spontaneous combustion process Download PDFInfo
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- CN212228894U CN212228894U CN202020920795.9U CN202020920795U CN212228894U CN 212228894 U CN212228894 U CN 212228894U CN 202020920795 U CN202020920795 U CN 202020920795U CN 212228894 U CN212228894 U CN 212228894U
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Abstract
The utility model discloses a coal spontaneous combustion in-process oxygen concentration's real-time supervision device, take place mechanism and oxygen concentration monitoring module including the air supply steel bottle that communicates in proper order, coal spontaneous combustion, the air supply steel bottle with be connected with between the mechanism and preheat the copper pipe, coal spontaneous combustion takes place the mechanism and includes the heating cabinet and set up at the heating cabinet in and supply the furnace body that the coal appearance was placed, the furnace body is the cylindricality, the height of furnace body is 10 times ~ 20 times of the diameter of furnace body, the bottom and the top of furnace body set up top gas outlet and bottom gas outlet respectively, be provided with a plurality of temperature sensing probe in the furnace body. The utility model relates to a rationally, can make the air supply quick, thermally equivalent, the gas flow is even in the stove, and can acquire the oxygen concentration in the sample gas in real time, and the practicality is strong.
Description
Technical Field
The utility model belongs to coal spontaneous combustion in-process oxygen concentration monitoring field, concretely relates to coal spontaneous combustion in-process oxygen concentration's real-time supervision device.
Background
Mine disaster accidents occur frequently in China, and the fire disasters caused by spontaneous combustion of coal account for more than 85% of mine fire accidents. Spontaneous combustion of coal is a very complicated physical and chemical change process, wherein the physical change comprises adsorption and desorption of gas, evaporation and condensation of moisture, heat conduction, temperature rise of coal body, loosening of structure and the like; the chemical changes include that various active structures in coal surface molecules and oxygen undergo chemical adsorption and chemical reaction to generate various oxygen-containing groups and generate various gases, and meanwhile, the generation of heat effect is accompanied. Due to the complexity of the coal spontaneous combustion process, it is difficult to predict the variation among the components of the coal spontaneous combustion process by means of calculation, simulation and the like, so that a method and means based on experimental research are necessary to reduce the theoretical error.
At present, most of researchers at home and abroad research on the spontaneous combustibility of coal takes air as a main air source, and a temperature rise experiment system is adopted to simulate the oxidation temperature rise process of coal. But because the defects of uneven heating of the coal body, uneven gas flow in the furnace and the like may exist in the experimental process, the accuracy of experimental data is reduced to a certain extent; in addition, in the prior art, after the coal sample is spontaneously combusted, the gas concentration parameters are acquired through manual sampling and testing, the sampled gas is easily affected by the external environment in the manual gas taking process, the test result is inaccurate, and the oxygen concentration cannot be displayed in real time in the sampling process, so that the oxygen consumption rate in the coal spontaneous combustion process and the oxidation spontaneous combustion degree analysis of the coal samples with different sections have larger errors in the follow-up analysis.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that not enough among the above-mentioned prior art is directed against, provide a coal spontaneous combustion in-process oxygen concentration's real-time supervision device, its reasonable in design can make the air supply quick, thermally equivalent, and the gas flow is even in the stove, and can acquire the oxygen concentration in the sample gas in real time, and the practicality is strong.
In order to solve the technical problem, the utility model discloses a technical scheme is: the utility model provides a coal spontaneous combustion in-process oxygen concentration's real-time supervision device which characterized in that: including the air supply steel bottle that communicates in proper order, coal spontaneous combustion takes place mechanism and oxygen concentration monitoring module, the air supply steel bottle with be connected with between the coal spontaneous combustion takes place the mechanism and preheat the copper pipe, coal spontaneous combustion takes place the mechanism and includes the heating chamber and sets up at the heating chamber in and supply the furnace body that the coal appearance was placed, the furnace body is the cylindricality, the height of furnace body is 10 times ~ 20 times of the diameter of furnace body, the bottom and the top of furnace body set up top gas outlet and bottom gas outlet respectively, be provided with a plurality of temperature-sensing probe in the furnace body.
The real-time monitoring device for the oxygen concentration in the coal spontaneous combustion process is characterized in that: a metal fine net is arranged in the furnace body, the metal fine net is arranged close to the bottom of the furnace body, and a gap is reserved between the metal fine net and the bottom of the furnace body; the coal sample is filled in the furnace body and is positioned at the upper part of the metal fine mesh, and a gap is reserved between the top of the coal sample and the furnace cover of the furnace body.
The real-time monitoring device for the oxygen concentration in the coal spontaneous combustion process is characterized in that: the plurality of temperature sensing probes comprise a top temperature sensing probe arranged at the top of the coal sample, a bottom temperature sensing probe arranged at the bottom of the coal sample and a plurality of middle temperature sensing probes arranged at the middle of the coal sample, the plurality of middle temperature sensing probes are arranged in the coal sample at equal intervals, and the temperature sensing probes are connected with the furnace wall through threads and are installed on the furnace wall.
The real-time monitoring device for the oxygen concentration in the coal spontaneous combustion process is characterized in that: the preheating copper pipe is communicated with the bottom of the furnace body, and the inner diameters of the preheating copper pipe and the furnace body are equal.
The device for monitoring the oxygen concentration in the coal spontaneous combustion process in real time is characterized in that: the furnace body is arranged in the temperature raising box, one side surface of the furnace body close to the temperature raising box is arranged, and one side surface of the temperature raising box is far away from the gas source steel cylinder.
The real-time monitoring device for the oxygen concentration in the coal spontaneous combustion process is characterized in that: the preheating copper pipe comprises a first section of copper pipe arranged along the bottom of the warming box and a second section of copper pipe connected with the first section of copper pipe, the output end of the gas source steel cylinder is connected with the second section of copper pipe through a connecting pipeline, and the first section of copper pipe extends out of the warming box.
The real-time monitoring device for the oxygen concentration in the coal spontaneous combustion process is characterized in that: the top gas outlet is connected with a top gas outlet pipe, the bottom gas outlet is connected with a bottom gas outlet pipe, the top gas outlet pipe and the bottom gas outlet pipe are respectively provided with a vent valve, and the top gas outlet pipe and the bottom gas outlet pipe are communicated with an oxygen concentration monitoring module.
The real-time monitoring device for the oxygen concentration in the coal spontaneous combustion process is characterized in that: the temperature sensing probe is connected with a temperature acquisition module, and the temperature acquisition module is arranged on the outer surface of the box body of the warming box.
Compared with the prior art, the utility model has the following advantage:
1. the utility model discloses a set up the furnace body into the cylinder, and the height of furnace body is 10 times ~ 20 times of the diameter of furnace body, can improve the homogeneity that the interior coal body of stove was heated, avoided traditional furnace body to a certain extent because the great experiment initial stage coal sample that causes of diameter is heated inhomogeneous phenomenon.
2. The utility model discloses a set up before the mechanism takes place at coal spontaneous combustion and preheat the copper pipe, keep the furnace body unanimous with the internal diameter that preheats the copper pipe, can make the air supply flow fast, even flow direction stove in, can make the coal sample and the air supply flow contact reaction simultaneously of guaranteeing same cross-section department.
3. The utility model discloses set up oxygen concentration monitoring module, can be accurate, quick test goes out the oxygen concentration in the exhaust sample gas in the furnace body, compensate the defect that the artificial sample easily receives external air interference on the one hand, on the other hand can realize oxygen concentration in the real-time detection coal sample, the follow-up analysis to the oxygen consumption rate of coal spontaneous combustion in-process and the oxidation spontaneous combustion degree of coal sample of being convenient for.
To sum up, the utility model relates to a rationally, can make the air supply quick, thermally equivalent, the gas flow in the stove is even, and can acquire the oxygen concentration in the sample gas in real time, and the practicality is strong.
The technical solution of the present invention is further described in detail by the accompanying drawings and examples.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural diagram of the furnace body of the present invention.
Description of reference numerals:
1-gas source steel cylinder; 2-a flow stabilizing valve; 3, furnace cover;
4, a furnace body; 5, a heating box; 6-oxygen concentration tester;
7-oxygen concentration display screen; 8-temperature sensing probe; 9-temperature acquisition module;
10-preheating a copper pipe; 11-top air outlet; 12-bottom air outlet;
13-exhaust valve; 14-metal fine mesh.
Detailed Description
As shown in fig. 1-2, the utility model discloses an air supply steel bottle 1, the spontaneous combustion of coal that communicate in proper order take place mechanism and oxygen concentration monitoring module 6, be connected with between air supply steel bottle 1 and the spontaneous combustion of coal take place the mechanism and preheat copper pipe 10, the spontaneous combustion of coal takes place the mechanism and includes heating box 5 and set up in heating box 5 and supply the furnace body 4 that the coal appearance was placed, furnace body 4 is the cylindricality, furnace body 4 highly is 10 times ~ 20 times of the diameter of furnace body 4, the bottom and the top of furnace body 4 set up top gas outlet 11 and bottom gas outlet 12 respectively, be provided with a plurality of temperature-sensing probe 8 in the furnace body 4.
In this embodiment, the height of the furnace body 4 is 10-20 times of the diameter of the furnace body 4, which can improve the uniformity of heating the coal in the furnace, and the smaller the diameter of the furnace body is, the external heat source can rapidly transfer the generated heat to the coal sample at the center, thereby avoiding the phenomenon of uneven heating of the coal sample at the initial stage of the experiment caused by the larger diameter of the traditional furnace body to a certain extent.
As shown in fig. 2, a metal fine mesh 14 is arranged in the furnace body 4, the metal fine mesh 14 is arranged near the bottom of the furnace body 4, and a gap is reserved between the metal fine mesh 14 and the bottom of the furnace body 4; the furnace body 4 is filled with a coal sample, the coal sample is positioned at the upper part of the metal fine mesh 14, and a gap is reserved between the coal sample and the furnace cover 3 on the furnace body 4.
In this embodiment, preferably, a maximum of 1kg of coal sample is loaded into the furnace body, and the furnace body is designed into a slender column with a diameter of 5cm and a length of 85cm (wherein the coal loading length of the furnace body is determined to be 80cm, and gaps of about 2.5cm are respectively reserved at the upper end and the lower end of the furnace body); in order to prevent the preheating copper pipe 10 from being blocked by the coal sample, a thin-layer metal fine mesh 14 is arranged above the reserved gap, and gas provided by the gas source steel cylinder 1 uniformly flows into the furnace through the metal fine mesh 14. The upper end and the lower end of the coal containing furnace body are respectively reserved with 2.5cm gaps, which is beneficial to the uniform ventilation of the furnace body.
The plurality of temperature sensing probes 8 comprise a top temperature sensing probe arranged at the top of the coal sample, a bottom temperature sensing probe arranged at the bottom of the coal sample and a plurality of middle temperature sensing probes arranged at the middle of the coal sample, the plurality of middle temperature sensing probes are arranged in the coal sample at equal intervals, and the temperature sensing probes 8 are installed on the furnace wall through threaded connection. In order to enhance the tightness of the experimental device, preferably, a PT100 high-precision shielding type spiral temperature sensing probe is adopted, and an air leakage channel is prevented from being formed between the furnace body and the temperature probe by spirally butting with the furnace wall.
As shown in fig. 1, the preheating copper pipe 10 is communicated with the lower part of the furnace body 4, and the inner diameters of the preheating copper pipe 10 and the furnace body 4 are equal.
In this embodiment, in order to ensure that the gas source flow can uniformly flow into the furnace, the inner diameters of the furnace body 4 and the preheating copper pipe 10 are kept consistent, and the coal sample at the same cross section can be ensured to contact and react with the gas source flow at the same time to the greatest extent.
The furnace body 4 is arranged in the warming box 5, one side surface of the furnace body 4 close to the warming box 5 is arranged, and one side surface of the warming box 5 is far away from the gas source steel cylinder 1.
In this embodiment, the temperature of the coal sample in the furnace body is controlled by the warming box 5, and the furnace body 4 is arranged at the side far away from the gas source steel cylinder 1, so that the gas source passing through the preheating copper pipe 10 has enough heating time in the warming box 5.
The preheating copper pipe 10 comprises a first section of copper pipe arranged along the bottom of the warming box 5 and a second section of copper pipe which is connected with the first section of copper pipe and vertically arranged, the output end of the gas source steel cylinder 1 is connected with the second section of copper pipe through a connecting pipeline, and the first section of copper pipe extends out of the warming box 5.
In this embodiment, in order to quickly and uniformly heat the air flow passing through the preheating copper pipe 10, it is preferable that the preheating copper pipe 10 located in the warming box 5 adopts a spiral pipeline; and the air source disturbance caused by the change of the inner diameter of the pipeline between the pipeline and the second section of copper pipe is reduced as much as possible, and the first section of copper pipe has enough length to ensure that the air source entering the second copper pipe is uniform.
The top gas outlet 11 is connected with a top gas outlet pipe, the bottom gas outlet 12 is connected with a bottom gas outlet pipe, the top gas outlet pipe and the bottom gas outlet pipe are respectively provided with a vent valve 13, and the top gas outlet pipe and the bottom gas outlet pipe are communicated with the oxygen concentration monitoring module 6.
In this embodiment, preferably, the oxygen concentration monitoring module 6 selects a ZOY-series intelligent zirconia oxygen analyzer, and connects the top gas outlet 11 and the bottom gas outlet 12 to two gas inlets of the intelligent zirconia oxygen analyzer respectively. With the gas outlet of furnace body and surveying oxygen analyzer seamless connection, through opening of control discharge valve 13, the gas directly flows into oxygen concentration monitoring module 6 through the gas outlet in the stove, and oxygen concentration passes through the direct demonstration of oxygen concentration display screen 7 on the oxygen concentration monitoring module 6, and the air sneaks in the data error that causes when having avoided artifical sample, can improve experimental apparatus's the accuracy that detects of seal and oxygen concentration and shorten the required time of oxygen measurement by a wide margin.
The temperature sensing probe 8 is connected with a temperature acquisition module 9, and the temperature acquisition module 9 is arranged on the outer surface of the box body of the warming box 5.
In this embodiment, preferably, the temperature acquisition module 9 adopts a network type two-way PT100 thermal resistance acquisition module with an LCD display screen and an LM-PT100 high-precision shielding type spiral temperature sensing probe matched with the PT100, so as to facilitate direct observation of the temperatures of coal samples with different cross sections, and facilitate subsequent analysis of the oxygen consumption rate in the coal spontaneous combustion process and the oxidation spontaneous combustion degree of the coal samples with different cross sections through real-time monitoring of the temperature and oxygen concentration of the coal samples.
When the utility model is used, after an experimental coal sample is put into the furnace body 4, the furnace body is fixedly placed in the heating box 5 through the bracket, and the heating box 5 provides a required heating environment for the coal-containing furnace body; the gas source steel cylinder 1 releases oxygen-containing gas, and the oxygen-containing gas flows to the preheating copper pipe 10 after passing through the flow stabilizing valve 2; after being heated by the preheating copper pipe 10, the airflow flows into the gap at the bottom of the furnace body 4 through the air inlet, and the airflow uniformly flows into the furnace through the metal fine mesh 14; the air flow passes through PT100 high-precision shielding type spiral temperature sensing probes uniformly pre-installed at the bottom, the middle and the top of a coal sample in the furnace body 4 to obtain coal temperature information at different sections; after the exhaust valve 13 is opened, the air flow is introduced into the oxygen concentration monitoring module 6 through the gas outlets 11 and 12 at the top and the bottom of the coal sample, so that the oxygen concentrations of the gas outlets 11 and 12 at the top and the bottom of the coal sample are directly obtained from the oxygen concentration display screen 7, and the oxygen consumption rate in the coal spontaneous combustion process and the oxidation spontaneous combustion degree of the coal sample are conveniently analyzed.
The above, only be the utility model discloses a preferred embodiment, it is not right the utility model discloses do any restriction, all according to the utility model discloses the technical entity all still belongs to any simple modification, change and the equivalent structure change of doing above embodiment the utility model discloses technical scheme's within the scope of protection.
Claims (8)
1. The utility model provides a coal spontaneous combustion in-process oxygen concentration's real-time supervision device which characterized in that: including air supply steel bottle (1), the spontaneous combustion of coal that communicate in proper order takes place mechanism and oxygen concentration monitoring module (6), air supply steel bottle (1) with be connected with between the spontaneous combustion of coal takes place the mechanism and preheat copper pipe (10), the spontaneous combustion of coal takes place the mechanism and includes heating chamber (5) and set up furnace body (4) that just supply the coal appearance to place in heating chamber (5), furnace body (4) are the cylindricality, the height of furnace body (4) is 10 times ~ 20 times of the diameter of furnace body (4), the top of furnace body (4) sets up top gas outlet (11), the bottom of furnace body (4) is provided with bottom gas outlet (12), be provided with a plurality of temperature sensing probe (8) in furnace body (4).
2. The device for monitoring the oxygen concentration in the coal spontaneous combustion process in real time according to claim 1, wherein: a metal fine net (14) is arranged in the furnace body (4), the metal fine net (14) is arranged close to the bottom of the furnace body (4), and a gap is reserved between the metal fine net (14) and the bottom of the furnace body (4); the furnace body (4) is filled with a coal sample, the coal sample is positioned at the upper part of the metal fine mesh (14), and a gap is reserved between the top of the coal sample and the furnace cover (3) of the furnace body (4).
3. The device for monitoring the oxygen concentration in the coal spontaneous combustion process in real time according to claim 1, wherein: the temperature sensing probes (8) are respectively a top temperature sensing probe penetrating the top of the coal sample, a bottom temperature sensing probe penetrating the bottom of the coal sample and a middle temperature sensing probe penetrating the middle of the coal sample, the number of the middle temperature sensing probes is multiple, the middle temperature sensing probes are uniformly distributed along the height direction of the coal sample, and the temperature sensing probes (8) are all installed on the furnace body (4) through threads.
4. The device for monitoring the oxygen concentration in the coal spontaneous combustion process in real time according to claim 1, wherein: the preheating copper pipe (10) is communicated with the lower part of the furnace body (4), and the inner diameters of the preheating copper pipe (10) and the furnace body (4) are equal.
5. The device for monitoring the oxygen concentration in the coal spontaneous combustion process in real time according to claim 1, wherein: the side surface of the furnace body (4) close to the warming box (5) is arranged, and the side surface of the warming box (5) is far away from the gas source steel cylinder (1).
6. The device for monitoring the oxygen concentration in the coal spontaneous combustion process in real time according to claim 1, wherein: the preheating copper pipe (10) comprises a first section of copper pipe arranged along the bottom of the warming box (5) and a second section of copper pipe connected with the first section of copper pipe, the output end of the gas source steel cylinder (1) is connected with the second section of copper pipe through a connecting pipeline, and the first section of copper pipe extends out of the warming box (5).
7. The device for monitoring the oxygen concentration in the coal spontaneous combustion process in real time according to claim 1, wherein: top gas outlet (11) are connected with the top outlet duct, bottom gas outlet (12) are connected with the bottom outlet duct, the top outlet duct with be provided with discharge valve (13) on the bottom outlet duct respectively, the top outlet duct with the bottom outlet duct all communicates with oxygen concentration monitoring module (6).
8. The device for monitoring the oxygen concentration in the coal spontaneous combustion process in real time according to claim 1, wherein: the temperature sensing probe (8) is connected with a temperature acquisition module (9), and the temperature acquisition module (9) is arranged on the outer surface of the box body of the warming box (5).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020920795.9U CN212228894U (en) | 2020-05-27 | 2020-05-27 | Real-time monitoring device for oxygen concentration in coal spontaneous combustion process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020920795.9U CN212228894U (en) | 2020-05-27 | 2020-05-27 | Real-time monitoring device for oxygen concentration in coal spontaneous combustion process |
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| CN212228894U true CN212228894U (en) | 2020-12-25 |
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| CN202020920795.9U Active CN212228894U (en) | 2020-05-27 | 2020-05-27 | Real-time monitoring device for oxygen concentration in coal spontaneous combustion process |
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