CN113063820A - Goaf gas transport and coal spontaneous combustion heat transfer dynamic balance experimental device and method - Google Patents
Goaf gas transport and coal spontaneous combustion heat transfer dynamic balance experimental device and method Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 159
- 238000012546 transfer Methods 0.000 title claims abstract description 28
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 27
- 230000002269 spontaneous effect Effects 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000000523 sample Substances 0.000 claims abstract description 76
- 238000005070 sampling Methods 0.000 claims abstract description 34
- 238000009423 ventilation Methods 0.000 claims abstract description 31
- 238000010438 heat treatment Methods 0.000 claims abstract description 27
- 238000007789 sealing Methods 0.000 claims abstract description 3
- 230000008859 change Effects 0.000 claims description 15
- 239000000203 mixture Substances 0.000 claims description 8
- 238000000605 extraction Methods 0.000 claims description 7
- 238000002474 experimental method Methods 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 3
- 238000011049 filling Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 40
- 238000004088 simulation Methods 0.000 description 14
- 239000001301 oxygen Substances 0.000 description 9
- 229910052760 oxygen Inorganic materials 0.000 description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 8
- 230000003647 oxidation Effects 0.000 description 6
- 238000007254 oxidation reaction Methods 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 5
- 239000011148 porous material Substances 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
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- 239000011435 rock Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
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- G01N25/22—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity on combustion or catalytic oxidation, e.g. of components of gas mixtures
- G01N25/40—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity on combustion or catalytic oxidation, e.g. of components of gas mixtures the heat developed being transferred to a flowing fluid
- G01N25/42—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity on combustion or catalytic oxidation, e.g. of components of gas mixtures the heat developed being transferred to a flowing fluid continuously
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention relates to the technical field of goaf experimental devices, and discloses a goaf gas transportation and coal spontaneous combustion heat transfer dynamic balance experimental device and a method, wherein the experimental device comprises the following steps: the invention relates to a coal bunker, a coal bunker cover plate, a ventilation part, a temperature polling instrument and a plurality of heating parts, wherein the coal bunker is used for containing coal samples, the coal bunker cover plate is movably connected to the coal bunker and is used for sealing the coal bunker, a plurality of connecting holes are formed in the coal bunker cover plate and can be connected with a sampling part, the sampling part is used for sampling gas at different positions in the coal bunker, the ventilation part is connected with the coal bunker and is used for providing air flow for the interior of the coal bunker, and a plurality of probes of the temperature polling instrument are respectively buried in the middle of the coal samples and are arranged in a grid shape and are used for measuring the temperature values of the coal samples at various positions in real time.
Description
Technical Field
The invention relates to the technical field of goaf experimental devices, in particular to a goaf gas transportation and coal spontaneous combustion heat transfer dynamic balance experimental device and method.
Background
The pores in the goaf have the characteristics of bending property, non-directionality, randomness and the like, and the air current leaking to the goaf from the working surface flows in a porous medium consisting of coal rock bodies to form a nonlinear seepage field comprising turbulence, transition flow and laminar flow; due to the existence of spontaneous combustion of residual coal in the goaf, the flow rule of gas can be influenced by the distribution of the temperature field, and the gas concentration in pores changes along with time and space, so that the gas flow process in the goaf is extremely complex.
At present, two methods of physical similar simulation and numerical simulation are mainly adopted for researching the gas migration rule of the goaf, a stope similar physical platform is mainly built through physical simulation according to actual proportion, gas flow traces are observed by means of tracers, smoke and the like in the early stage, and along with the development of monitoring technology, sensors such as gas, oxygen concentration, pressure, wind speed and the like are used for monitoring data such as gas concentration, pressure, flow speed and the like in the goaf. The numerical simulation method is characterized in that the goaf is assumed to be a porous medium under a certain pore structure, parameters such as porosity and internal resistance of the goaf are calculated by adopting a masonry beam theory and an O-shaped ring theory according to actual geology and mining conditions of a working face, a fluid distribution calculation model of the goaf is established by combining the Darcy law, and the flow field distribution of the goaf is calculated by utilizing a finite element gridding processing method. Most of the basic parameters are used by an empirical formula, the obtained simulation result is only an approximate solution of flow field distribution of the goaf, and the problems of poor simulation convergence, huge calculation result data volume, unchanged use and the like often exist. The simulation method has the advantages that the simulation method has the advantages of similarity and numerical simulation, the physical simulation requires that the characteristic parameters of the original structure are not changed while the model is reduced, the design requirement on the experimental platform is high, the numerical simulation is convenient to use, but the accuracy of the key basic parameters directly influences the accuracy of the simulation result, so that the mutual combination of the simulation method and the numerical simulation method and repeated experiments are effective methods for solving complex problems.
The heat transfer process inside the goaf can be divided into two situations: one type is heat transfer with no flow inside or very slow speed or small temperature difference between flow and solid, the heat transfer can be processed according to heat conduction, a local heat balance model is adopted, equivalent heat conductivity is used as a macroscopic heat conductivity coefficient, and correlation formulas of various conditions can be utilized; the other type is that forced convection occurs inside and a certain temperature difference exists between the flow and the solid, and the heat transfer needs to adopt a local non-heat balance model. The temperature field distribution of the goaf, the heat conductivity (heat conductivity coefficient and the like) of the coal body and the flow law of the wind flow field are closely related, and the result is the combined action of heat conduction between the coal body and the wind flow and wind flow heat transportation, and the interaction relationship between the goaf wind flow field and the temperature field needs to be studied in depth.
In conclusion, the coal spontaneous combustion process relates to oxygen transportation and diffusion, heat transfer and coal-oxygen reaction, the theories are established on the basis of the research of a goaf air flow field and a goaf temperature field, the two theories interact with each other and are mutually restricted, and the unbalanced development inevitably causes disaster accidents.
Disclosure of Invention
The invention provides a goaf gas transport and coal spontaneous combustion heat transfer dynamic balance experimental device and method, and aims to simulate the dynamic balance problem of a goaf air flow field and a goaf temperature field in real time.
One of the purposes of the invention is to provide a goaf gas transportation and coal spontaneous combustion heat transfer dynamic balance experimental device, which comprises:
the coal bunker is used for containing a coal sample;
the coal bunker cover plate is movably connected to the coal bunker and used for sealing the coal bunker, a plurality of connecting holes are formed in the coal bunker cover plate, the connecting holes can be connected with the sampling part, and the sampling part is used for sampling gas at different positions in the coal bunker;
the ventilation part is connected with the coal bunker and is used for providing wind flow for the interior of the coal bunker;
the temperature polling instrument is characterized in that a plurality of probes on the temperature polling instrument are respectively buried in the middle of a coal sample and are arranged in a grid shape, and the probes are used for measuring the temperature value of each coal sample in real time;
and the heating parts are respectively buried in the middle of the coal sample.
Optionally, the ventilation part comprises:
the two air bins are fixedly connected with the coal bin and are respectively arranged on the left side and the right side of the coal bin, the air bins are communicated with the coal bin through a ventilation plate with a plurality of ventilation holes, and the side surfaces of the air bins are provided with first air inlet holes;
and the fan is connected with the first air inlet hole and used for conveying air flow to the air bin.
Optionally, the front of the wind cabin is provided with a second wind inlet hole.
Optionally, a fixed cross rod is further arranged in the coal bunker, and the fixed cross rod is used for fixing the heating part and the probe.
Optionally, the number of connection holes is fifteen.
Optionally, the temperature polling instrument is a multi-channel temperature polling instrument, and the number of the probes is not less than fifteen.
Optionally, the sampling portion includes gas collection appearance, sampling bag and chromatographic analyzer, and the gas collection appearance is connected with the connecting hole, collects the gas of gathering in the sampling bag and carries out gas composition analysis with the chromatographic analyzer.
Optionally, the heating part is heating.
The invention also aims to provide a goaf gas transport and coal spontaneous combustion heat transfer dynamic balance experimental method, which comprises the following steps:
s1: drying the coal sample, filling the coal sample into a coal bunker, burying a heating part in the middle of the coal sample, and burying a probe of a temperature polling instrument in the middle of the coal sample;
s2: the upper end of the coal bunker is sealed by a coal bunker cover plate, and the coal bunker is connected with the ventilation part;
s3: firstly opening a ventilation part with adjustable air volume to provide air flow for the interior of the coal bunker, and then opening a heating part to heat;
s4: the method comprises the following steps of performing real-time acquisition of coal sample temperatures at different positions according to a plurality of probes of a temperature polling instrument, analyzing a formed real-time temperature network data set, and respectively connecting sampling parts to connecting holes on a coal bunker cover plate for air extraction during sampling; when the temperature difference of a plurality of probes of the temperature polling instrument is within a preset range, the sampling part is respectively connected with the connecting hole to perform air extraction for a plurality of times, the air extraction is performed for one time at a first fixed time interval before the temperature measured by the probes is 50 ℃, the air extraction is performed for one time at a second time interval after the temperature measured by the probes exceeds 50 ℃, and the second time interval is longer than the first fixed time interval;
s5: obtaining a data set of temperature changes along with time and a data set of gas components along with time;
s6: from the data group obtained in S5, a two-dimensional graph of temperature change and a graph of gas composition change under the influence of wind speed are drawn.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, coal can be quickly oxidized and accumulated through the plurality of heating parts buried in the coal sample, the heat can be taken away by the ventilation part arranged around the coal sample, the temperature change of a plurality of positions in the coal sample can be monitored in real time through the plurality of probes of the temperature polling instrument, the change of the temperature before and after the temperature is observed on a ventilation line, the quantity of the heat taken away by the air leakage quantity can be obtained, and the dynamic balance between an air flow field and a temperature field can be researched by changing the size of the air speed. When the coal is spontaneously combusted, because the air leakage of the goaf can generate two effects, firstly, oxygen is increased, and secondly, the heat accumulated by coal oxidation is taken away, the main functions of the device are that when the coal is spontaneously combusted, firstly, the air flow field provides air speed by the ventilation part to simulate the air leakage of the goaf, the air quantity of the ventilation part simulates the air leakage quantity of the goaf, a probe of a temperature inspection instrument forms a temperature monitoring network, the temperature change of the whole coal body can be visually seen, the combination of the air flow and the temperature field can directly obtain the quantity of the heat generated by coal oxidation which is taken away by the air flow, finally, a dynamic balance can be formed, the balance rule between the heat taken away by the air leakage quantity of the goaf and the heat generated by coal oxidation caused by the increased oxygen is researched, the oxygen is irregularly collected gas by the sampling part, then, the composition of the gas is monitored by a gas chromatograph, and the rule has important theoretical significance for solving the gas flow theory and heat transfer theory of the spontaneous combustion of, because the goaf belongs to the closed space, the device can clearly reflect the relation between the temperature field and the air flow field, provide basic parameters for mine ventilation safety, and compared with other devices, the device can more intuitively reflect the relation between the temperature field and the air flow field of spontaneous combustion of coal in the goaf.
Drawings
FIG. 1 is a front view of a goaf gas transport and coal spontaneous combustion heat transfer dynamic balance experimental apparatus provided in an embodiment of the present invention;
fig. 2 is a structural plan view of a goaf gas transportation and coal spontaneous combustion heat transfer dynamic balance experimental apparatus provided in an embodiment of the present invention.
Description of reference numerals:
1-a first air inlet hole, 2-a second air inlet hole, 3-a coal bunker cover plate, 4-a temperature polling instrument, 5-an air bunker, 6-a probe, 7-a ventilating plate, 8-a fixed cross rod, 9-a heating part, 10-a coal bunker, 11-a connecting hole, 12-a sampling part and 13-a fan.
Detailed Description
An embodiment of the present invention will be described in detail below with reference to the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the embodiment.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of describing technical solutions of the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
The invention provides a goaf gas transport and coal spontaneous combustion heat transfer dynamic balance experimental device and method, aiming at simulating the dynamic balance problem of a goaf air flow field and a temperature field in real time.
As shown in fig. 1-2, an experimental apparatus for dynamic balance between gas transportation in a gob and spontaneous combustion heat transfer of coal according to an embodiment of the present invention includes: coal bunker 10, coal bunker apron 3, the ventilation portion, temperature patrol and examine appearance 4 and a plurality of heating portion 9, coal bunker 10 is used for holding the coal sample, coal bunker apron 3 swing joint is on coal bunker 10, be used for sealed coal bunker 10, coal bunker apron 3 is last to have a plurality of connecting holes 11, connecting hole 11 can be connected with sampling portion 12, sampling portion 12 is used for sampling the gas of coal bunker 10 inside different positions department, ventilation portion is connected with coal bunker 10, be used for providing the distinguished and admirable for coal bunker 10 is inside, a plurality of probes 6 that temperature patrol and examine appearance 4 bury respectively in the middle part of coal sample and are latticed and arrange, a temperature value for each coal sample of real-time measurement, connecting wire between temperature patrol and examine appearance 4 and a plurality of probes 6 passes connecting hole 11 respectively, a plurality of heating portions 9 bury respectively in the coal sample middle part, the circuit of heating portion 9 passes connecting hole 11 and extends to coal bunker 10 outsides.
According to the invention, coal can be quickly oxidized and accumulated through the plurality of heating parts buried in the coal sample, the heat can be taken away by the ventilation part arranged around the coal sample, the temperature change of a plurality of positions in the coal sample can be monitored in real time through the plurality of probes of the temperature polling instrument, the change of the temperature before and after the temperature is observed on a ventilation line, the quantity of the heat taken away by the air leakage quantity can be obtained, and the dynamic balance between an air flow field and a temperature field can be researched by changing the size of the air speed. When the coal is spontaneously combusted, because the air leakage of the goaf can generate two effects, firstly, oxygen is increased, and secondly, the heat accumulated by coal oxidation is taken away, the main functions of the device are that when the coal is spontaneously combusted, firstly, the air flow field provides air speed by the ventilation part to simulate the air leakage of the goaf, the air quantity of the ventilation part simulates the air leakage quantity of the goaf, a probe of a temperature inspection instrument forms a temperature monitoring network, the temperature change of the whole coal body can be visually seen, the combination of the air flow and the temperature field can directly obtain the quantity of the heat generated by coal oxidation which is taken away by the air flow, finally, a dynamic balance can be formed, the balance rule between the heat taken away by the air leakage quantity of the goaf and the heat generated by coal oxidation caused by the increased oxygen is researched, the oxygen is irregularly collected gas by the sampling part, then, the composition of the gas is analyzed by a gas chromatograph, and the rule has important theoretical significance for solving the gas flow theory and heat transfer theory of the spontaneous combustion of, because the goaf belongs to the closed space, the device can clearly reflect the relation between the temperature field and the air flow field, provide basic parameters for mine ventilation safety, and compared with other devices, the device can more intuitively reflect the relation between the temperature field and the air flow field of spontaneous combustion of coal in the goaf.
Optionally, the ventilation part comprises: two air bins 5 and a fan 13, in this embodiment, the fan 13 is a fan with adjustable air volume, the two air bins 5 are fixedly connected with the coal bin 10 and are respectively arranged at the left side and the right side of the coal bin 10, the air bins 5 are communicated with the coal bin 10 through a ventilation plate 7 with a plurality of ventilation holes, the side surface of the air bin 5 is provided with a first air inlet hole 1, the fan 13 is connected with the first air inlet hole 1 to convey air flow for the air bin 5, so that the air enters the coal bin 10 from the side surface, the air bin 5 at the left side is stable for the air flow initially entering the coal bin 10, the transition from the first air inlet 1 to the coal bin 10 is started, the influence of the turbulent air flow on the coal body environment is avoided, the air bin 5 at the right side is stable for the air flow exiting the coal bin 10, the transition from the coal bin 10 to the first air inlet 1 is started, and the influence of the backflow of the air flow on the environment in.
Optionally, the front of the air bin 5 is provided with a second air inlet hole 2, the fan 13 can also be connected with the second air inlet hole 2 to enable air to enter from the front, the air leakage state of the actual goaf is simulated, the air flow is not directly blown to the goaf, and the comparison between different air inlet directions and temperature changes can be studied.
Optionally, a fixed cross bar 8 is further disposed in the coal bunker 10, and the fixed cross bar 8 is used for fixing the heating portion 9 and the plurality of probes 6.
Optionally, fifteen connecting holes 11 form a temperature monitoring network, so that the temperature change can be visually judged.
Optionally, the temperature polling instrument 4 is a multi-path temperature polling instrument, and the number of the probes 6 of the temperature polling instrument 4 is not less than fifteen.
Optionally, the sampling part 12 includes a gas collector, a sampling bag and a chromatograph, the gas collector is connected to the connection hole 11, and the collected gas is collected into the sampling bag and analyzed by the chromatograph.
Optionally, the heating part 9 is a heating pipe.
The invention also provides a goaf gas transport and coal spontaneous combustion heat transfer dynamic balance experimental method, which is characterized by comprising the following steps:
s1: drying the coal sample, filling the coal sample into a coal bunker 10, burying a heating part 9 in the middle of the coal sample, and burying a probe 6 of a temperature polling instrument 4 in the middle of the coal sample;
s2: the upper end of the coal bunker 10 is sealed by a coal bunker cover plate 3, and the coal bunker 10 is connected with the ventilation part;
s3: s3: firstly, opening a ventilation part with adjustable air volume to provide air flow for the interior of a coal bunker 10, and then opening a heating part 9 for heating;
s4: the method comprises the following steps of (1) carrying out real-time acquisition of coal sample temperatures at different positions according to a plurality of probes 6 of a temperature polling instrument 4, analyzing a formed real-time temperature network data set, and respectively connecting sampling parts 12 to connecting holes 11 on a coal bunker cover plate 3 for air extraction during sampling; when the temperature difference of a plurality of probes 6 of the temperature inspecting instrument 4 is within a preset range, the sampling part 12 is respectively connected with the connecting hole 11 for carrying out air extraction for a plurality of times, the temperature measured by the probes 6 is extracted once at a first fixed time interval before 50 ℃, and is extracted once at a second time interval after the temperature measured by the probes 6 exceeds 50 ℃, wherein the second time interval is longer than the first fixed time interval;
s5: obtaining a data set of temperature changes along with time and a data set of gas components along with time;
s6: from the data group obtained in S5, a two-dimensional graph of temperature change and a graph of gas composition change under the influence of wind speed are drawn.
The use method and the working principle are as follows:
firstly, after a coal sample is dried, the coal sample is filled into a coal bunker 10 according to specific conditions, meanwhile, a heating pipe is buried in the middle of the coal sample, probes 6 of a temperature polling instrument 4 are buried in the middle of the coal sample respectively and are arranged at intervals with the heating pipe, 15 probes 6 are buried together, a coal bunker cover plate 3 is covered, and an air volume adjustable fan is connected to a first air inlet 1. After the experiment preparation is completed, the air volume adjustable fan is firstly opened, then the heating pipe is opened, when the temperature difference of 15 probes 6 of the temperature patrol instrument 4 is 1 ℃, the probes are used for extracting air from the connecting holes 11 and pumping a pipe of air into the sampling bag by using the small-sized needle cylinder, the temperature of the probes 6 is collected once at an interval of 3 minutes before 50 ℃, the temperature of the probes exceeds 50 ℃, the probes are collected once at an interval of 5 minutes, the time interval can be specifically controlled according to actual analysis, and finally obtained data comprise a data group with the temperature changing along with the time and a gas component changing along with the time.
According to the temperature data group, a temperature change two-dimensional graph and a gas composition change graph under the influence of the wind speed can be drawn, so that reliable data basis is provided for researching the dynamic balance of the goaf wind flow field and the temperature field.
The above disclosure is only for a few specific embodiments of the present invention, however, the present invention is not limited to the above embodiments, and any variations that can be made by those skilled in the art are intended to fall within the scope of the present invention.
Claims (9)
1. The utility model provides a collecting space area gas transport and coal spontaneous combustion heat transfer dynamic balance experimental apparatus which characterized in that includes:
the coal bunker (10) is used for containing a coal sample;
the coal bunker cover plate (3) is movably connected to the coal bunker (10) and used for sealing the coal bunker (10), a plurality of connecting holes (11) are formed in the coal bunker cover plate (3), the connecting holes (11) can be connected with a sampling part (12), and the sampling part (12) is used for sampling gas at different positions in the coal bunker (10);
the ventilation part is connected with the coal bunker (10) and is used for providing air flow for the interior of the coal bunker (10);
the temperature patrol instrument (4) is provided with a plurality of probes (6) which are respectively buried in the middle of the coal sample and arranged in a grid shape, and is used for measuring the temperature value of each coal sample in real time;
and the heating parts (9) are respectively buried in the middle of the coal sample.
2. The goaf gas transport and coal spontaneous combustion heat transfer dynamic balance experimental apparatus as claimed in claim 1, wherein said ventilation section comprises:
the two air bins (5) are fixedly connected with the coal bin (10) and are respectively arranged on the left side and the right side of the coal bin (10), the air bins (5) are communicated with the coal bin (10) through a ventilation plate (7) with a plurality of ventilation holes, and the side surfaces of the air bins (5) are provided with first air inlet holes (1);
and the fan (13) is connected with the first air inlet hole (1) and is used for conveying air flow to the air bin (5).
3. The experimental device for goaf gas transport and coal spontaneous combustion heat transfer dynamic balance as claimed in claim 2, wherein the front face of the air bin (5) is provided with a second air inlet hole (2).
4. The experimental device for goaf gas transportation and coal spontaneous combustion heat transfer dynamic balance as claimed in claim 1, wherein a fixed cross bar (8) is further arranged in the coal bunker (10), and the fixed cross bar (8) is used for fixing the heating part (9) and the probe (6).
5. The experimental device for goaf gas transport and coal spontaneous combustion heat transfer dynamic balance as claimed in claim 1, wherein there are fifteen connecting holes (11).
6. The experimental device for goaf gas transport and coal spontaneous combustion heat transfer dynamic balance as claimed in claim 5, wherein said temperature polling instrument (4) is a multi-channel temperature polling instrument, and the number of said probes (6) is not less than fifteen.
7. The experimental apparatus for goaf gas transport and coal spontaneous combustion heat transfer dynamic balance as claimed in claim 1, wherein said sampling portion (12) comprises a gas collector, a sampling bag and a chromatographic analyzer, said gas collector is connected to said connection hole (11), and the collected gas is collected into said sampling bag and the chromatographic analyzer is used to analyze the gas composition.
8. The experimental apparatus for goaf gas transport and coal spontaneous combustion heat transfer dynamic balance as claimed in claim 1, wherein said heater (9) is a heating tube.
9. A goaf gas transport and coal spontaneous combustion heat transfer dynamic balance experimental method is characterized by comprising the following steps:
s1: drying a coal sample, filling the coal sample into a coal bunker (10), burying a heating part (9) in the middle of the coal sample, and burying a probe (6) of a temperature polling instrument (4) in the middle of the coal sample;
s2: the upper end of the coal bunker (10) is sealed by a coal bunker cover plate (3), and the coal bunker (10) is connected with the ventilation part;
s3: firstly, opening a ventilation part with adjustable air volume to provide air flow for the interior of the coal bunker (10), and then opening a heating part (9) to heat;
s4: the method comprises the following steps of (1) carrying out real-time collection of coal sample temperatures at different positions according to a plurality of probes (6) of a temperature polling instrument (4), analyzing a formed real-time temperature network data set, and respectively connecting sampling parts (12) to connecting holes (11) on a coal bunker cover plate (3) to extract air during sampling; when the temperature difference of a plurality of probes (6) of the temperature polling instrument (4) is within a preset range, connecting the sampling part (12) with the connecting hole (11) respectively to perform air extraction for a plurality of times, wherein the temperature measured by the probes (6) is extracted once at a first fixed time interval before 50 ℃, and is extracted once at a second time interval after the temperature measured by the probes (6) exceeds 50 ℃, and the second time interval is longer than the first fixed time interval;
s5: obtaining a data set of temperature changes along with time and a data set of gas components along with time;
s6: from the data group obtained in S5, a two-dimensional graph of temperature change and a graph of gas composition change under the influence of wind speed are drawn.
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| CN114814152A (en) * | 2022-04-20 | 2022-07-29 | 安徽理工大学 | Simple and portable device for measuring normal-temperature oxidation of coal and using method thereof |
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