CN114935614A - Simulation experiment device and experiment method for analyzing reburning characteristics of coal body - Google Patents
Simulation experiment device and experiment method for analyzing reburning characteristics of coal body Download PDFInfo
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- 238000004088 simulation Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 25
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 124
- 238000010438 heat treatment Methods 0.000 claims abstract description 71
- 238000002485 combustion reaction Methods 0.000 claims abstract description 40
- 238000004458 analytical method Methods 0.000 claims abstract description 38
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- 238000001514 detection method Methods 0.000 claims abstract description 22
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- 238000012216 screening Methods 0.000 claims abstract description 6
- 239000007789 gas Substances 0.000 claims description 148
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 66
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 48
- 239000001301 oxygen Substances 0.000 claims description 48
- 229910052760 oxygen Inorganic materials 0.000 claims description 48
- 229910052757 nitrogen Inorganic materials 0.000 claims description 27
- 230000008859 change Effects 0.000 claims description 15
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- 239000000203 mixture Substances 0.000 description 6
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- 229910001882 dioxygen Inorganic materials 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 239000003550 marker Substances 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
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- 239000010963 304 stainless steel Substances 0.000 description 1
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 150000001335 aliphatic alkanes Chemical class 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention discloses a simulation experiment device for analyzing the reburning characteristics of coal, belonging to the technical field of research on the reburning characteristics of coal; the device comprises a gas supply system, a heating reaction system and a detection and analysis system, wherein the heating reaction system comprises a heating module and a reaction module, the detection and analysis system comprises a gas analysis module and a temperature analysis module, and the heating reaction system is connected with the temperature analysis module through a temperature measuring element; the invention also provides a simulation experiment method for analyzing the reburning characteristics of the coal body, which utilizes the simulation experiment device and comprises the steps of screening a sample, spontaneous combustion of the coal body, extinguishing coal fire, performing a reburning experiment of the coal body, observing a residual coal sample and the like. The device is simple and convenient to use, can save experimental space and reduce error influence, and has great significance for research on the frequent re-ignition phenomenon of the existing coal mine.
Description
Technical Field
The invention belongs to the technical field of research on coal reburning characteristics, and particularly relates to a simulation experiment device and an experiment method for analyzing the reburning characteristics of coal.
Background
Coal spontaneous combustion sometimes occurs in the coal seam mining process, when the coal spontaneous combustion occurs, a method of sealing a fire zone is usually adopted to extinguish at the present stage, but when the closed fire zone after being extinguished is opened again, the phenomenon of coal re-combustion is very easy to occur. Meanwhile, high-concentration gas is formed in a closed fire area under a high-temperature environment, the gas is easily subjected to gas explosion accidents due to the space-time coupling with the occurrence of a re-ignition fire source, and the danger in the fire area unsealing process is greatly increased. Therefore, the utilization rate of the coal mine is limited, and the mining safety is poor.
While previous research has tended to suggest that the re-ignition phenomenon in the confined fire zone is caused by oxygen supply during the unsealing of smoldering coal, as the research advances, the applicant and its team have found that the coal sample is thermally decomposed in the confined environment to generate a large number of active sites which are stable under the condition of inert medium and are rapidly oxidized upon contact with oxygen to cause the coal temperature to rapidly increase. Therefore, another possibility exists for reburning the coal body after unsealing, namely, reburning the extinguished coal body again; in view of the danger of re-ignition in the unsealed and sealed fire zone, it is urgently needed to develop a related testing device for the re-ignition condition of the extinguished fire zone.
At the present stage, not only relevant professional research equipment is lacked, but also the current research schemes are large simulation researches, small-scale research methods and research instruments are few, and the existing large-scale experiments need to use a plurality of systems for experimental research in the afterburning research, so that the problems of complex experimental flow, large experimental engineering quantity, large error, long time and the like exist, and the problems are not favorable for repeated experiments and result verification.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a simulation experiment device for analyzing the reburning characteristics of coal bodies, which is short in time consumption, simple and convenient in process and repeatable.
In order to solve the technical problem, the gas supply system comprises a gas supply system, a heating reaction system and a detection and analysis system, wherein the heating reaction system comprises a heating module and a reaction module, the detection and analysis system comprises a gas analysis module and a temperature analysis module, and the heating reaction system is connected with the temperature analysis module through a temperature measuring element.
Preferably, the heating reaction system is connected with the temperature analysis module through a thermocouple, and the thermocouple is connected with the reaction module.
Preferably, in the horizontal direction, a plurality of thermocouples are arranged at intervals along the radial direction of the reaction module, and the length of each thermocouple arranged in the reaction module is different; in the vertical direction, a plurality of groups of thermocouples are arranged at equal intervals along the axial direction of the reaction module.
Preferably, the heating reaction system is provided with a heating and warming device and a reaction tank, and the heating and warming device is used for heating the coal body; the top of the reaction tank is connected with a top cover, and the reaction tank is provided with an air inlet and an air outlet.
Preferably, the whole body of the heating reaction system is of a cylinder three-section structure, the reaction tank is of a double-layer hollow structure, and the top cover, the air inlet and the air outlet are movably connected with the reaction tank.
Preferably, the gas supply system is connected with the heating reaction system through a gas supply pipe, the heating reaction system is connected with the gas analysis module through a gas guide pipe, and the gas analysis module comprises a direct valve and a gas chromatograph.
The invention also provides a simulation experiment method for analyzing the reburning characteristics of the coal body, which utilizes the simulation experiment device and comprises the following steps:
screening samples: crushing the coal blocks into uniform particle sizes, loading the coal blocks into a heating reaction system, then sealing a reaction module, and starting the heating module;
spontaneous combustion of coal: opening a valve of the gas analysis module to enable oxygen-containing gas in a system pipeline to pass through an oxygen-containing gas of a gas supply system so as to enable the oxygen-containing gas to be fully filled in the reaction module, and then detecting gas components through the gas analysis module to verify that the gas components are fully filled in the reaction module; the coal body is spontaneous combusted through the heating module, and whether the spontaneous combustion phenomenon occurs to the coal body is judged through the detection and analysis system;
extinguishing coal fire: after the coal body is combusted, controlling the mass flow meter, stopping introducing oxygen-containing gas into the gas supply system, introducing nitrogen into the reaction module, extinguishing flame, and verifying that the reaction module is filled with nitrogen through the gas analysis module;
coal reburning experiment: controlling the mass flow meter, stopping introducing nitrogen, introducing oxygen-containing gas instead, observing the temperature displayed by the temperature measuring element and observing the system gas components analyzed by the gas analysis module;
and (3) observing a residual coal sample: controlling the mass flowmeter, introducing nitrogen into the device, opening the reaction module after the device is cooled, taking out the coal sample for observation, observing the change of surface properties, and analyzing components by using an analyzer.
Preferably, the oxygen-containing gas is formed by mixing 79% of nitrogen and 21% of oxygen, and the heating module is heated to 600 ℃ to ensure that the coal body is self-ignited.
The invention also provides a simulation experiment method for analyzing the reburning characteristics of the coal body, which utilizes the simulation experiment device and comprises the following steps:
installing a simulation experiment device in advance, installing pipelines connected with each other, putting a coal sample (40-200 meshes) with the mass of 5kg into a reaction module, sealing and fixing the device, and introducing nitrogen through an air supply system to prevent the coal sample from being oxidized at low temperature under natural conditions;
regulating and controlling a mass flow meter of a gas supply system, introducing oxygen-containing gas at the speed of 0.5L/min, and detecting by a gas analysis module until gas components are unchanged within 6 min;
starting the heating module, heating the reaction module, closing the heating module when the temperature continuously rises, spontaneous combustion of the coal occurs, monitoring the temperature in the reaction module through the temperature analysis module, and analyzing and detecting the gas in the system through the gas analysis module;
controlling a gas supply system, adjusting a mass flow meter, stopping introducing oxygen-containing gas, switching to introducing nitrogen gas to extinguish the flame of the coal body, wherein the introducing flow rate of the nitrogen gas is 0.5L/min, monitoring temperature and gas data through a detection and analysis system, and when the temperature of each measuring point of the coal body is reduced to normal temperature and the gas component is pure nitrogen gas, determining that the coal sample is completely extinguished;
closing the mass flow meter and cleaning residual coal samples in the equipment;
and (4) carrying out repeated experiments, adjusting the mass flow meter, setting the introduced gas into the gas with different oxygen concentrations to enable the coal body to be re-combusted, and observing the change of temperature and gas components through the detection and analysis system.
Preferably, the oxygen-containing gas initially introduced into the reaction module is formed by mixing 79% of nitrogen and 21% of oxygen, when the heating module heats the coal body, the power of the heating module is set to be 800W, and when the temperature in the reaction module is detected to exceed 600 ℃ through the temperature measuring element and the temperature continuously rises, the heating module is closed, at the moment, the coal body should be continuously heated and ignited, and when the temperature measuring element detects that the temperature of the reaction module is continuously raised for 15min, the coal body is considered to be in a stable combustion state.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides the integrated simulation experiment device for analyzing the reburning characteristics of the extinguished coal body, and the device is simpler and more convenient to use; by researching the re-ignition phenomenon, the method has great significance for the re-ignition phenomenon frequently occurring in the coal mine at present; the principle of the application method is that the coal is ignited by spontaneous combustion, then put out and finally oxygen is introduced to re-combust the coal.
The process of spontaneous combustion and re-combustion of the coal body is carried out in the same device, so that troubles caused by equipment replacement are reduced, the coal sample which is already spontaneously combusted is not required to be collected, the experiment times are reduced, the experiment space can be saved, the heat loss during the experiment can be reduced, and the error of the re-combustion experiment is reduced; the gas chromatograph is used for observing gas components to judge related reaction processes and analyze related reaction products, so that the detection range can be expanded, and scientific research personnel can be helped to better perform test screening and generate experimental data.
The invention is beneficial to the research of people on the re-ignition phenomenon after spontaneous combustion or fire passing of coal, and analyzes the re-ignition condition in the coal mine, thereby reducing the loss and the danger caused by the re-ignition under the mine.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a schematic structural diagram of a simulation experiment apparatus according to the present invention;
FIG. 2 is a schematic view of the structure of a heating reaction system according to the present invention;
FIG. 3 is a schematic view of the arrangement of the thermocouples according to the present invention in the horizontal direction;
fig. 4 is a schematic view of the structure of the top cover and the quick-connect apparatus of the present invention.
The symbols in the figures indicate:
1. an air supply system; 11. a gas cylinder group; 111. a nitrogen gas cylinder; 112. an oxygen cylinder; 12. a control valve; 13. a mass flow meter; 14. a three-way valve;
2. heating the reaction system; 21. a heating temperature-raising device; 22. a reaction tank; 23. a thermocouple; 24. a top cover; 25. an air inlet; 26. an air outlet; 27. a quick connect device;
3. a detection analysis system; 31. a gas chromatograph; 32. a first through valve; 33. a second through valve; 34. a temperature detection system;
4. a first air duct;
5. a second air duct.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Referring to fig. 1, the invention provides a simulation experiment device for analyzing the reburning characteristics of coal, which includes a gas supply system 1, a heating reaction system 2, and a detection and analysis system 3, wherein the heating reaction system 2 includes a heating module and a reaction module, the detection and analysis system 3 includes a gas analysis module and a temperature analysis module, and the heating reaction system 2 is connected with the temperature analysis module through a temperature measuring element.
Specifically, as shown in fig. 1, the gas supply system 1 includes a gas cylinder group 11, a control valve 12 and a mass flow meter 13, the gas cylinder group 11 is provided with a nitrogen gas cylinder 111 and an oxygen gas cylinder 112 for storing nitrogen and oxygen respectively, and the nitrogen gas cylinder 111 and the oxygen gas cylinder 112 are both connected with gas supply pipelines, each gas supply pipeline is provided with a control valve 12 and a mass flow meter 13, wherein the control valve 12 is used for controlling gas pressure, and the mass flow meter 13 is used for regulating and controlling gas flow; the end parts of the two gas supply pipelines are provided with three-way valves 14, the outer ends of the three-way valves 14 are connected with first gas guide pipes 4, and the gas supply system 1 is connected with the heating reaction system 2 through the first gas guide pipes 4.
Furthermore, the gas supply system 1 controls the components and the internal volume of the gas in the pipeline through the mass flow meter 13 and the three-way valve 14, and the gas in the gas supply system 1 is adjusted through the mass flow meter 13, mixed through the three-way valve 14 and then introduced into the reaction module.
Specifically, as shown in fig. 2, the heating reaction system 2 includes a heating temperature-raising device 21 and a reaction tank 22, the heating temperature-raising device 21 is used for helping the coal body to generate spontaneous combustion, and the reaction tank 22 is used for storing the coal body and performing a combustion reaction; the reaction tank 22 is connected with a thermocouple 23, the reaction tank 22 is connected with the temperature analysis module through the thermocouple 23, and the reaction tank 22 is connected with the gas analysis module through the second gas guide pipe 5.
Furthermore, the whole heating reaction system 1 is designed into a cylinder three-section structure, and sequentially comprises a top cover 24, a reaction tank 22 and a heating temperature-raising device 21 from top to bottom, wherein the top cover 24 is arranged at the top of the reaction tank 22 and used for sealing the reaction tank 22, and the heating temperature-raising device 21 is arranged at the lower part of the reaction tank 22; the reaction tank 22 is provided with an air inlet 25 and an air outlet 26, the air supply system 1 is connected with the air inlet 25 on the reaction tank 22 through the first air duct 4, and the air outlet 26 on the reaction tank 22 is connected with the gas analysis module of the detection and analysis system 3 through the second air duct 5.
Furthermore, as a preferred embodiment of the present invention, the tank body of the reaction tank 22 is a double-layer hollow structure, and a porous soaking plate is arranged inside the tank body for storing the heated coal; the reaction tank 22 is internally made of high-temperature-resistant quartz glass, the outside of the reaction tank is made of 304 stainless steel, a high-temperature-resistant fluorine rubber sealing ring is arranged at a feeding port at the top of the reaction tank and can resist the high temperature of 200 ℃, the vacuum design is adopted in the middle of the reaction tank, the heat loss can be reduced, and the temperature can reach the temperature required by re-combustion when the re-combustion occurs to the maximum extent.
Furthermore, as a preferred embodiment of the present invention, the outer diameter of the reaction tank 22 is 800-820mm, the inner diameter is 590-600mm, and the height of the reaction tank is 800-1000 mm; the inner diameter of a feed port of the tank body is 300mm, the outer diameter of the feed port of the tank body is 510mm, the diameters of an upper air inlet 25 and an upper air outlet 26 of the reaction tank 22 are both 4mm, the length of a neck part of the upper end of the tank body is 200mm, the thicknesses of an inner layer and an outer layer of the tank body are both 35mm, and a middle vacuum layer is 30 mm; the diameter of the top cover is 510 mm; the height of the heating and temperature-raising device 21 arranged at the lower part of the reaction tank 22 is 300-500 mm.
As shown in fig. 2 and 3, the thermocouples 23 are connected with the reaction tank 22 in a direct-insert connection manner, a plurality of sets of thermocouples 23 are arranged on the reaction tank 22, a plurality of sets of thermocouples 23 are arranged along the radial direction of the reaction tank 22 in the horizontal direction, the plurality of sets of thermocouples 23 are arranged at intervals along the circumferential direction of the reaction tank 22, and the lengths of each set of thermocouples 23 in the reaction tank 22 are different; in the vertical direction, a plurality of sets of thermocouples 23 are arranged at equal intervals along the longitudinal axial direction of the reaction tank 22.
Specifically, in the horizontal direction, a thermocouple 23 is arranged at a position 3-4cm away from the wall of the reaction tank 22, then a thermocouple 23 is arranged at the central point of the reaction tank 22, a thermocouple 23 is arranged on a concentric circle at a position 50cm away from the center of the reaction tank 22 in the middle, and the thermocouples 23 are distributed at intervals; in the vertical direction, a group of thermocouples 23 is arranged every 20cm from top to bottom, and 7 groups are arranged.
According to the invention, through the plurality of groups of thermocouples 23 arranged at intervals, each point away from the coal core can be measured, so that the temperature analysis can be better carried out.
Furthermore, as a preferred embodiment of the present invention, in order to ensure that the thermocouple 23 can still work normally at high temperature, the thermocouple 23 is a K-type sheathed thermocouple WRNK-191 pin thermocouple, and is made of 2520 material with high temperature resistance and 3mm diameter.
Furthermore, as shown in fig. 4, the top of the reaction tank 22 is a feed inlet, the feed inlet is provided with a heat insulation felt, a sealing ring, a top cover 24 and a quick connection device 27, and the refractory performance of the whole equipment can be ensured by arranging a high temperature resistant coating and a high temperature resistant fluorine rubber sealing ring between the tank body and the top cover 24; the top cover 24 is tightly connected with the top of the reaction tank 22 through a quick connection device 27 to form a closed space together.
Furthermore, the top cover 24, the air inlet 25, the outlet gas 26 and the thermocouple 23 are detachably connected with the reaction tank 22, and the air inlet 25, the air outlet 26 and the pipeline are connected in a bolt connection mode; the quick connection means 27 is provided with a snap and a fastening bolt, using the snap for quick fixation and fastening with the fastening bolt, and then through the rotating bolt at the rear end, the connection means can be opened quickly, thereby achieving separation of the connection means from the top cover 24 and the tank body of the retort 22.
Furthermore, at least two gas inlets and gas outlets are arranged on the reaction tank 22, and the redundant gas inlets and gas outlets are sealed by using screw caps, so that gas can be introduced during spontaneous combustion to ensure oxygen supply.
As shown in fig. 1, the gas analysis module is provided with a through valve and a gas chromatograph 31, the through valve is arranged on the second gas guide tube 5, the end of the second gas guide tube 5 is divided into two paths by a three-way valve, the two paths are provided with the through valves, namely a first through valve 32 and a second through valve 33, one path is used for emptying, the other path is connected with the gas chromatograph 31, and the through valve can not only change diameter, but also be used for switching between emptying and gas measurement.
The temperature analysis module is provided with a temperature detection system 34, and the temperature detection system 34 is connected with the thermocouples 23 and can process data of the thermocouples 23.
Furthermore, as a preferred embodiment of the present invention, the gas chromatograph 31 is an agilent GC990A type gas chromatograph, and can test related marker gases such as carbon monoxide, alkanes, alkenes, alkynes, and the like.
In the invention, gas generated by the combustion of coal in the reaction tank 22 enters the second gas-guide tube 5 from the gas outlet 26, and enters the gas chromatograph 31 for gas analysis after the natural cooling of the pipeline; the temperature generated in the reaction tank 22 is transmitted to the temperature sensing system 34 through the plurality of thermocouples 23, so that the temperature change is analyzed.
Furthermore, as a preferred embodiment of the present invention, the first and second airway tubes 4, 5 may be airway tubes.
The experimental device is designed based on the viewpoint of normal-temperature oxidation of active sites of the coal body, and the reburning characteristic of the extinguished coal body is researched. When the temperature of the coal reaches 600 ℃, the coal can be spontaneously combusted, and when the temperature measured by the thermocouple 23 continuously increases for 15min, the coal can be considered to be completely combusted; after a certain period of time, nitrogen is introduced to extinguish the fire, then oxygen-containing gas is introduced to re-ignite the fire, the re-ignition is characterized in that a certain temperature is raised, gases such as carbon dioxide are generated, and a thermocouple 23 and a gas chromatograph 31 can be used for measuring the related temperature and the change condition of the gases.
The invention also provides a simulation experiment method for analyzing the reburning characteristics of the coal body, and the simulation experiment is carried out by the simulation experiment device.
The first embodiment is as follows:
the simulation experiment method specifically comprises the following steps:
1) screening samples: the appropriate coal is selected and pulverized to the desired uniform particle size to allow loading into the body of the reaction tank 22, and the reaction tank 22 is closed with a quick connector 27 which checks the air tightness of the air inlet 25 and the air outlet 26.
2) Spontaneous combustion of coal: starting the heating module, controlling the mass flow meter 13, opening a second straight-through valve 33, closing a first straight-through valve 32, and introducing oxygen-containing gas of a gas supply system into a system pipeline, wherein the oxygen-containing gas is formed by mixing 79% of nitrogen and 21% of oxygen, so that the oxygen-containing gas fills the whole tank body of the reaction tank 22; then, the second straight-through valve 33 is closed, the first straight-through valve 32 is opened, and the gas composition in the reaction tank 22 is analyzed and detected through the gas chromatograph 31 to verify that the reaction tank is completely full;
the temperature of the coal is raised to 600 ℃ by the heating temperature raising device 21, the coal is spontaneously combusted, the temperature is detected by the thermocouple 23 on the reaction tank 22, and the gas flowing out is analyzed by the gas chromatograph 31 to determine whether the spontaneous combustion phenomenon occurs.
3) Extinguishing coal fire: after a certain period of combustion, the mass flow meter 13 is controlled to stop the introduction of the oxygen-containing gas and to introduce the nitrogen gas, the flame is extinguished, and it is confirmed by the gas chromatograph 31 that the entire apparatus is filled with the nitrogen gas.
4) Coal reburning experiment: the mass flow meter 13 was controlled to stop the introduction of nitrogen gas, to change the introduction of oxygen-containing gas to observe the temperature indicated by the thermocouple 23 and to observe the gas composition analyzed by the gas chromatograph 31.
5) And (3) observing a residual coal sample: controlling the mass flow meter 13, introducing nitrogen into the device for a certain time, after the device is cooled, closing related instruments, opening the tank body of the reaction tank 22, taking out a coal sample, observing by using instruments such as a scanning electron microscope and the like, observing the surface property change, and analyzing components by using other instruments.
6) Cleaning and drying: the reaction tank 22 is cleaned and dried before the next set of experiments is performed.
Example two:
the simulation experiment method specifically comprises the following steps:
1) the simulation experiment device is installed in advance, the pipelines connected with each other are installed, a coal sample (40-200 meshes) with the weight of about 5kg is placed into the reaction tank 22, the top cover 24 is covered, the reaction tank is connected and fixed through the quick connection device 27, the device is sealed and fixed, and nitrogen is firstly introduced to prevent the coal sample from being oxidized at low temperature under natural conditions.
2) The mass flow meter 13 was adjusted to introduce an oxygen-containing gas (21% oxygen mixed with 79% nitrogen) at a rate of 0.5L/min, and the gas composition was detected by the gas chromatograph 31 until no change occurred in the gas composition at 6 min.
3) And (3) starting the heating and temperature rising device 21, setting the heating power to be 800W, closing the heating and temperature rising device 21 after the temperature sensor connected with the thermocouple 23 detects that the temperature exceeds 600 ℃ and the temperature continuously rises for a period of time, continuing to heat the coal body to ignite, continuously heating the temperature sensor for 15min, and analyzing and detecting the gas discharged from the system by using the gas chromatograph 31 when the coal body is in a combustion state.
4) By adjusting the mass flow meter 13 and the three-way valve 14, the introduction of the oxygen-containing gas is stopped, pure nitrogen is introduced instead for extinguishing the flame of the coal body, the nitrogen is introduced by the gas supply system at the flow rate of 0.5L/min, the temperature and gas data are monitored, and when the temperature of each measuring point of the coal body is reduced to the normal temperature and the gas component is pure nitrogen, the coal sample is considered to be completely extinguished.
5) And closing the mass flow meter 13 and other devices, and cleaning residual coal samples in the devices.
6) And (3) performing repeated experiments, setting the introduced gas as gas containing oxygen with different concentrations when the mass flow meter 13 is adjusted in the step 4), so that the coal body is subjected to re-combustion, and performing characteristic analysis by observing the change of the temperature sensor and the change curve of the gas component in the gas chromatograph 31.
The experimental results of this example are: under pure oxygen condition, the temperature of the coal core is increased by 16.6 ℃, 16.4 ℃, 14.5 ℃ and 12.4 ℃ from bottom to top, and carbon monoxide with the highest concentration of 3620ppm and carbon dioxide with the highest concentration of 14000ppm are generated; under the condition of 21% oxygen concentration, the temperature of the coal core rises to 13.5 ℃, 11.9 ℃, 11.4 ℃ and 11.0 ℃, and the maximum concentration of carbon monoxide and carbon dioxide generated at the same time are 2831ppm and 9102ppm respectively.
The result analysis shows that the higher the concentration of the introduced oxygen, the more the temperature rise of the oxygen, and the more the generated marker gas; the coal body is more prone to re-ignition as the oxygen concentration increases, and the higher the oxygen concentration, the more severe the coal body is.
Example three:
in this embodiment, the remaining active sites after different combustion times are determined mainly by changing different combustion times, and the simulation experiment method specifically includes the following steps:
1) the simulation experiment device is installed in advance, the pipelines connected with each other are installed, a coal sample (40-200 meshes) with the weight of about 5kg is placed into the reaction tank 22, the top cover 24 is covered, the reaction tank is connected and fixed through the quick connection device 27, the device is sealed and fixed, and nitrogen is firstly introduced to prevent the coal sample from being oxidized at low temperature under natural conditions.
2) The mass flow meter 13 was regulated, an oxygen-containing gas (consisting of 21% oxygen mixed with 79% nitrogen) was fed at a rate of 0.5L/min, and detection was performed by the gas chromatograph 31 until the gas composition did not change at 6 min.
3) Starting the heating and temperature rising device 21, setting the heating power to be 800W, and after the temperature sensor connected with the thermocouple 23 detects that the temperature exceeds 600 ℃ and the temperature continuously rises for a period of time, closing the heating and temperature rising device 21, wherein the coal body should be continuously heated and ignited, and the temperature sensor continuously rises for 15min, and the coal body is considered to be in a combustion state at the time; meanwhile, the combustion state of the coal body is maintained for 10min, and the gas coming out of the system is analyzed and detected by the gas chromatograph 31.
4) By adjusting the mass flow meter 13 and the three-way valve 14, the introduction of the oxygen-containing gas is stopped, pure nitrogen is introduced instead for extinguishing the flame of the coal body, the nitrogen is introduced by the gas supply system at the flow rate of 0.5L/min, the temperature and gas data are monitored, and when the temperature of each measuring point of the coal body is reduced to the normal temperature and the gas component is pure nitrogen, the coal sample is considered to be completely extinguished.
5) And closing the mass flow meter 13 and other devices, and cleaning residual coal samples in the devices.
6) The experiment was repeated, and the time for keeping the coal body burned in step 3) was changed, and the change in temperature and the change curve of the gas composition analyzed by the gas chromatograph 31 were observed to perform characteristic analysis.
The experimental results simulated in this example are: after the coal body is kept burning for 15min, re-burning is carried out under the condition of dry air, the temperature of the most center of the coal body is increased by 13.6 ℃, the highest concentration of carbon dioxide generation is 7617ppm, and the highest concentration of carbon monoxide is 3520 ppm; after the burning time is 30min, the most central temperature of the reburning coal body rises by 12.4 ℃, the maximum concentration of the generated carbon monoxide is 2002ppm, and the maximum concentration of the generated carbon dioxide is 4803 ppm.
According to result analysis, the longer the coal burning time is, the less substances are needed for re-burning, and the temperature and the characteristic gas concentration when the re-burning occurs are further reduced.
The invention provides the integrated simulation experiment device for analyzing the reburning characteristics of the extinguished coal body, and the device is simpler and more convenient to use; the method can perform relevant simulation and analysis of the extinguishing time and the re-ignition possibility for places where the re-ignition easily occurs, such as coal fields with high spontaneous ignition re-ignition property, such as Xinjiang and inner Mongolia, and closed fire areas after spontaneous ignition in a goaf, and the like, and has great significance for the re-ignition phenomenon frequently occurring in the coal mine at present by researching the re-ignition phenomenon.
The principle of the method is that the coal is ignited by spontaneous combustion, then put out and finally oxygen is introduced to re-combust the coal; and (3) analyzing the re-ignition temperature to determine the generation position of the related re-ignition temperature and the temperature curve during re-ignition, and simultaneously detecting the gas components, analyzing the gas components generated during self-ignition and re-ignition to detect the related active sites or reaction products. The invention is beneficial to the research of people on the phenomenon of after-combustion of coal after spontaneous combustion or fire passing, and the analysis of the after-combustion condition in coal mines, thereby reducing the loss and the danger caused by the after-combustion under the mines.
The process of spontaneous combustion and re-combustion of the coal body is carried out in the same device, so that troubles caused by equipment replacement are reduced, the spontaneous combustion coal sample does not need to be collected, the experiment times are reduced, the experiment space can be saved, the heat loss during the experiment can be reduced, and the error in the re-combustion experiment is reduced; the gas chromatograph is used for observing gas components to judge related reaction processes and analyze related reaction products, so that the detection range can be expanded, and scientific research personnel can be helped to better perform test screening and generate experimental data.
In the description of the present invention, it is to be understood that the orientations or positional relationships indicated by the terms, such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, are based on the orientations or positional relationships shown in the drawings, and are for convenience of description and simplicity of description only, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. The utility model provides a simulation experiment device of analysis coal body after-combustion characteristic, includes gas supply system and heating reaction system, its characterized in that still includes detection and analysis system, heating reaction system includes heating module and reaction module, detection and analysis system includes gas analysis module and temperature analysis module, heating reaction system pass through temperature element with temperature analysis module connects.
2. The simulation experiment device for analyzing the reburning characteristics of the coal body as claimed in claim 1, wherein the heating reaction system is connected with the temperature analysis module through a thermocouple, and the thermocouple is connected with the reaction module.
3. The simulation experiment device for analyzing the reburning characteristics of the coal body as claimed in claim 2, wherein a plurality of thermocouples are arranged in the horizontal direction at intervals along the radial direction of the reaction module, and the length of each thermocouple arranged in the reaction module is different; and a plurality of groups of thermocouples are arranged in the vertical direction at equal intervals along the axial direction of the reaction module.
4. The simulation experiment device for analyzing the reburning characteristics of the coal body as claimed in claim 1, wherein the heating reaction system is provided with a heating temperature raising device and a reaction tank, the heating temperature raising device is used for heating the coal body; the top of retort is connected with the top cap, be provided with air inlet and gas outlet on the retort.
5. The simulation experiment device for analyzing the reburning characteristics of a coal body according to claim 4, wherein the heating reaction system is integrally of a cylindrical three-section structure, the reaction tank is of a double-layer hollow structure, and the top cover, the gas inlet and the gas outlet are movably connected with the reaction tank.
6. The device of claim 1, wherein the gas supply system is connected to the heating reaction system through a gas supply pipe, the heating reaction system is connected to the gas analysis module through a gas guide pipe, and the gas analysis module comprises a direct valve and a gas chromatograph.
7. A simulation test method for analyzing a re-ignition characteristic of a coal body using the simulation test apparatus according to any one of claims 1 to 6, comprising the steps of:
screening samples: crushing coal blocks into uniform particle sizes, loading the coal blocks into a heating reaction system, then sealing the reaction module, and starting the heating module;
spontaneous combustion of coal: opening a valve of a gas analysis module to enable oxygen-containing gas in a system pipeline to pass through the gas supply system first, so that the reaction module is filled with the oxygen-containing gas, and then detecting gas components through the gas analysis module to verify that the reaction module is completely filled with the oxygen-containing gas; the coal body is self-ignited through the heating module, and whether the coal body is self-ignited is judged through the detection and analysis system;
extinguishing coal fire: after the coal body is combusted, controlling a mass flow meter, stopping introducing oxygen-containing gas into the gas supply system, introducing nitrogen into the reaction module, extinguishing flame, and verifying that the reaction module is filled with nitrogen through the gas analysis module;
coal reburning experiment: controlling the mass flow meter, stopping introducing nitrogen, introducing oxygen-containing gas instead, observing the temperature displayed by the temperature measuring element and observing the system gas components analyzed by the gas analysis module;
and (3) observing a residual coal sample: controlling a mass flowmeter, introducing nitrogen into the device, opening the reaction module after the device is cooled, taking out a coal sample for observation, observing the change of surface properties, and analyzing components by using an analyzer.
8. The simulation experiment method for analyzing the reburning characteristics of the coal body as claimed in claim 7, wherein the oxygen-containing gas is formed by mixing 79% of nitrogen and 21% of oxygen, and the heating module is heated to 600 ℃ to make the coal body self-ignite.
9. A simulation experiment method for analyzing a re-ignition characteristic of a coal body using the simulation experiment apparatus according to any one of claims 1 to 6, comprising the steps of:
a simulation experiment device is installed in advance, pipelines connected with each other are installed, a coal sample (40-200 meshes) with the mass of 5kg is placed into the reaction module, the device is sealed and fixed, and then nitrogen is introduced through the gas supply system to prevent the coal sample from being oxidized at low temperature under natural conditions;
regulating and controlling a mass flow meter of the gas supply system, introducing oxygen-containing gas at the speed of 0.5L/min, and detecting by the gas analysis module until gas components are not changed within 6 min;
the heating module is started, the temperature of the reaction module is raised, when the temperature continuously rises, the heating module is closed, spontaneous combustion occurs to the coal body, the temperature in the reaction module is monitored through the temperature analysis module, and the gas in the system is analyzed and detected through the gas analysis module;
controlling the gas supply system, adjusting the mass flow meter, stopping introducing oxygen-containing gas, switching to introducing nitrogen gas to extinguish the flame of the coal body, wherein the introducing flow rate of the nitrogen gas is 0.5L/min, monitoring temperature and gas data through the detection and analysis system, and considering that the coal sample is completely extinguished when the temperature of each measuring point of the coal body is reduced to normal temperature and the gas component is pure nitrogen gas;
closing the mass flow meter and cleaning residual coal samples in the equipment;
and carrying out repeated experiments, adjusting the mass flow meter, setting the introduced gas into the gas with different oxygen concentrations to re-combust the coal, and observing the change of temperature and gas components through the detection and analysis system.
10. The simulation experiment method for analyzing the reburning characteristics of coal body as claimed in claim 9, wherein when the heating module heats the coal body, the power of the heating module is set to 800W, and when the temperature in the reaction module exceeds 600 ℃ and the temperature is continuously increased as measured by the temperature measuring element, the heating module is turned off, and the coal body should be continuously heated and ignited, and when the temperature measuring element measures that the temperature of the reaction module is continuously increased for 15min, the coal body is considered to be in the stable burning state.
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