CN107328551B - Fully mechanized working face heterogeneous goaf flow field simulation experiment device - Google Patents
Fully mechanized working face heterogeneous goaf flow field simulation experiment device Download PDFInfo
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Abstract
The invention relates to a comprehensive working face heterogeneous goaf flow field simulation experiment device, which adopts the technical scheme that a rail extending out of a box body along an inlet and an outlet of the pulley is horizontally arranged in the box body, the pulley is arranged on the rail, a jack used for driving the pulley to slide along the rail is arranged on the pulley, a bottom similar rock stratum is filled in the box body below the lower end face of a side baffle, a coal seam with the top surface higher than the upper surface of a top plate is filled between the working face baffle, the side baffle and the inner wall of the box body, the coal seam with the higher part extends to the upper surface of the top plate and covers the upper surface of the top plate, the top similar rock stratum is filled in the box body above the coal seam, and the top plate, the working face baffle, the side baffle and the bottom similar rock stratum jointly enclose a simulated coal seam space.
Description
Technical Field
The invention relates to a goaf flow field simulation experiment device, in particular to a goaf flow field simulation experiment device for a fully mechanized caving face.
Background
China is a country with serious coal spontaneous combustion, resource and environment losses caused by coal spontaneous combustion every year are difficult to estimate, and the problem of coal spontaneous combustion is more likely to occur on a fully mechanized coal mining working face due to low recovery rate, low propelling speed and the like. According to statistics, over 95% of spontaneous combustion of coal occurs in a goaf where people cannot look directly or arrive, so that physicochemical parameters of a spontaneous combustion fire source of the coal are difficult to obtain accurately, and the fire extinguishing effect is poor.
In recent years, researchers mainly study the spontaneous combustion problem of the coal in the goaf of the fully mechanized caving face from two aspects of numerical simulation and physical simulation in a laboratory. The selection of the numerical simulation parameters has more estimated values, so that the simulation result deviates from the actual result and must be corrected by means of a physical model or field data. Because field data are restricted by various factors, the field data are not easy to obtain and have errors, and therefore, the method for reliably solving the spontaneous combustion of the coal in the goaf is realized by building a physical model of the goaf to carry out physical simulation. At present, most of the existing goaf physical models are filled with crushed stone, crushed coal and other artificial materials to form a goaf, overburden rock is not loaded on the upper part of the fillers to form pressure, and after the goaf physical models formed by artificial filling are loaded with overburden pressure, research results cannot be well matched with actual field.
In order to form a goaf physical model with high similarity to the field, the inventor applies and authorizes a patent number ZL201410453668.1 in 2014, "fully mechanized caving/mining longwall face goaf flow field simulation test device and method", and after later research, the device has the following problems: (1) the similarity with the field is not high. For example, the overburden coal rock layer and the sliding block can descend together in the descending process of the hydraulic lifting rod, and a heterogeneous goaf with high similarity is difficult to form; the width of the sliding block is uniformly arranged, so that the progress of each coal mining is equal; the ventilation height of the site fully mechanized coal mining working surface is the height of the bracket, and the ventilation height in the device is the height of the bracket and the coal caving; a working face goaf direction in the device is not provided with a baffle, and the working face is blocked after the overlying coal rock layer falls off. (2) Many hydraulic lifting rods, the management is complicated, destroys easily, is difficult to change. For example, the length of the device is 3800mm, the length of the coal wall protected at two ends is 400mm, according to 50mm of simulated coal mining each time, 68 liquid drainage pressure lifting rods are needed, and according to two hydraulic lifting rods arranged below each sliding block, 136 hydraulic lifting rods are needed; each hydraulic lifting rod needs an oil pipe or an air pipe, and the management is complex; the hydraulic rods have the defect rate problem, and the normal operation of the experiment can be influenced if one of the hydraulic rods is damaged; considering the safety and the size of the lower part, electronic components such as a hydraulic lifting rod, a thermocouple and the like are difficult to replace after being damaged. (3) The device has complex control and high cost, and is not easy to realize under the condition of the prior art. For example, when 68 rows of sliding blocks descend, two hydraulic lifting rods are required to synchronously and stably descend, so that the cost of the device is greatly increased; when the slide blocks are inclined and sundries exist between the slide blocks, the friction force between the slide blocks can be increased, so that the slide blocks are prevented from descending to the appointed position; the sliding block is made of metal, and the device does not consider the problem of heat dissipation of the lower part of the sliding block; in the descending process of the sliding block, the flow field of the stope can be disturbed, and the accuracy of measured data is influenced; due to the fact that the coal mining progress is different every day on the spot, the sliding block needs to be narrowed, so that the number of the hydraulic lifting rods is increased, and suitable hydraulic lifting rods are not easy to buy in the market. Therefore, improvement and innovation thereof are imperative.
Disclosure of Invention
Aiming at the situation, in order to overcome the defects of the prior art, the invention aims to provide a fully mechanized caving face heterogeneous goaf flow field simulation experiment device, which can effectively solve the problems that the coal mining of the working face is simulated by pulling and pulling a pulley, the heterogeneous goaf is formed by natural falling of the dead weight of an overlying coal rock layer, the similarity with the field is higher, the experiment process is reliable and easy to operate, and the reliability of the obtained experiment data is higher.
The technical scheme of the invention is as follows:
a fully mechanized working face heterogeneous goaf flow field simulation experiment device comprises a box body, wherein the box body is of a hollow structure, a pulley access port which is communicated with the inside and the outside is arranged on a front panel of the box body, a track which extends out of the box body along the pulley access port is horizontally arranged in the box body, a pulley is arranged on the track, a jack which is used for driving the pulley to slide along the track is arranged on the pulley, a horizontal top plate is arranged at the top of the pulley, a working face baffle which extends downwards is arranged at the front end of the top plate, side baffles which vertically extend downwards are arranged on two sides of the top plate, bottom similar rock strata are filled in the box body below the lower end face of each side baffle, coal seams with top surfaces higher than the upper surface of the top plate are filled between the working face baffle, the side baffles and the inner wall of the box body, the coal seams with higher parts extend to the upper surface of the top plate and cover the upper surface of the top plate, top similar rock strata are filled in the box body above the coal seams, and simulation space is defined by the top plate, the working face baffle, the side baffles, and the bottom similar rock strata together;
a plurality of groups of heating holes which are uniformly distributed are arranged on a bottom plate of the box body along the sliding direction of the pulley, a heating channel communicated with the simulated coal seam space is arranged in a bottom similar rock stratum above the heating holes, a heating pipe is arranged in the heating channel, a plurality of air exhaust temperature measuring holes which are uniformly distributed are arranged on the bottom plate at the periphery of the heating holes, an air exhaust temperature measuring channel communicated with the simulated coal seam space is arranged in the bottom similar rock stratum above the air exhaust temperature measuring holes, and a thermocouple and an air exhaust pipe are respectively arranged in the air exhaust temperature measuring channel;
the side shield inner side of both sides is provided with along longitudinal arrangement's air inlet tunnel and return air tunnel respectively, and the working face baffle inboard is provided with along transverse arrangement's working face tunnel, and air inlet tunnel and return air tunnel are linked together with the both ends in working face tunnel respectively, constitute U type ventilation structure, and working face baffle lower part equipartition has a plurality of holes that leak of being linked together with the working face tunnel, and air inlet tunnel, return air tunnel, working face tunnel and hole that leaks constitute the simulation system that leaks out in collecting space area.
The lower ends of the thermocouple and the exhaust tube extend out of the air exhaust temperature measurement hole, the output end of the thermocouple is connected with the temperature collector, the lower end of the exhaust tube is connected with the vacuum pump, and a seal is arranged among the thermocouple, the exhaust tube and the air exhaust temperature measurement hole.
The top surface of the bottom similar rock stratum is covered with a thin coal layer with the thickness of 5 mm.
The beneficial technical effects of the invention are as follows:
1. according to the situation of the coal rock layer on site, similar coal rock layers are laid on the box body and the pulley, the size design of the device can meet geometric similarity, the coal mining process is simulated by pushing and pulling the pulley, the movement parameters of the pulley can be regulated and controlled according to the actual situation, after the overlying coal rock layer loses the support of the pulley, deformation and damage are generated by dead weight until caving is generated, the whole process is natural caving, and the similarity between the formed heterogeneous goaf and the site is high;
2. laying a U-shaped ventilation pipeline at the lower part of the pulley, realizing extraction type ventilation by utilizing an air blower, meeting the requirements of power similarity and motion similarity by the device, uniformly distributing a plurality of groups of air leakage holes in the goaf direction of a roadway on a working face to simulate air leakage, and ensuring high similarity between stope space ventilation and air leakage and a site;
3. the heating pipes are arranged at the bottom of the box body to heat float coal to simulate a coal spontaneous combustion high-temperature point, meanwhile, air leakage of the gob is simulated, the float coal is heated in an anoxic environment to generate gas heat and is spread and transported in the heterogeneous gob, the similarity between the gas spread and transport environment in the gob and the field is high, and the acquired gob gas heat field change rule can better guide the identification and prevention and control of a field gob coal spontaneous combustion fire source;
4. the reserved holes at the bottom of the box body are used as gas release sources, and other reserved holes at the bottom are used as air extraction holes, so that the gas concentration distribution rule of the goaf under different gas release sources and ventilation conditions can be obtained, and the method has guiding significance for preventing and controlling gas disasters of the goaf;
5. the device has the advantages of easy selection of processing materials, low cost, reliable structure and easy operation, and the heating pipe, the thermocouple and the exhaust pipe are arranged from the bottom plate and are easy to replace after being damaged. Overall, the device satisfies geometric similarity, power similarity, motion similarity, and the experimental result that obtains is high in reliability, can be used to accurately obtain collecting space area coal spontaneous combustion source physicochemical parameter and collecting space area gas concentration distribution rule, and the experimental result can be better the location of guidance on-the-spot collecting space area coal spontaneous combustion source and collecting space area gas disaster prevention and control.
Drawings
FIG. 1 is a front view of the experimental apparatus of the present invention.
FIG. 2 is a front cross-sectional view of an experimental apparatus of the present invention (not filled with a similar formation).
FIG. 3 is a top view of the experimental set-up of the present invention (not filled with similar rock, not installed with a sled).
FIG. 4 is a cross-sectional side view of the experimental set-up according to the invention.
FIG. 5 is a cross-sectional side view of an experimental apparatus of the present invention (not filled with a similar formation).
FIG. 6 is a partial enlarged view of the working face baffle of the experimental device of the present invention.
Fig. 7 is a schematic view of the installation of the heating tube of the present invention.
Fig. 8 is a schematic view of the installation of the thermocouple and the extraction tube of the present invention.
Fig. 9 is a schematic structural view of the working face baffle of the present invention.
Fig. 10 is a schematic view of the construction of the tackle of the present invention.
FIG. 11 is a schematic view of the U-shaped ventilation system of the present invention.
FIGS. 12-14 are schematic cross-sectional views illustrating simulation of caving of a goaf in mining in accordance with the present invention
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Given by fig. 1 to 14:
a fully mechanized working face heterogeneous goaf flow field simulation experiment device comprises a box body 1, wherein the box body 1 is of a hollow structure, a pulley access 29 which is communicated with the inside and the outside is arranged on a front panel 11a of the box body, a rail 7 which extends out of the box body along the pulley access 29 is horizontally arranged in the box body, a pulley 2 is arranged on the rail 7, a jack 14 for driving the pulley 2 to slide along the rail is arranged on the pulley 2, a horizontal top plate 10 is arranged at the top of the pulley 2, a working face baffle 19 which extends downwards is arranged at the front end of the top plate 10, side baffles 30 which vertically extend downwards are arranged on two sides of the top plate 10, bottom similar rock strata 3a are filled in the box body below the lower end face of each side baffle 30, a coal seam 4 with the top face higher than the upper surface of the top plate is filled between each working face baffle, each side baffle and the inner wall of the box body, the coal seam higher than the upper surface of the top plate extends to cover the upper surface of the top plate, top plate 3b is filled in the box body above the coal seam 4, and a top plate, and a coal seam space 31 which is simulated coal seam is surrounded by the top plate, the working face baffles, the side baffles and the bottom similar rock strata;
a plurality of groups of heating holes 20a are uniformly distributed on a bottom plate 6 of the box body 1 along the sliding direction of the pulley, a heating channel 32a communicated with the simulated coal seam space 31 is arranged in a bottom similar rock stratum above the heating holes 20a, a heating pipe 25 is arranged in the heating channel 32a, a plurality of air-extracting temperature-measuring holes 20b are uniformly distributed on the bottom plate around the heating holes 20a, an air-extracting temperature-measuring channel 32b communicated with the simulated coal seam space 31 is arranged in the bottom similar rock stratum above the air-extracting temperature-measuring holes 20b, and thermocouples 22 and air-extracting pipes 23 are respectively arranged in the air-extracting temperature-measuring channel 32 b;
the inner side surfaces of the side baffles 30 at two sides are respectively provided with an air inlet roadway 9a and an air return roadway 9b which are longitudinally arranged, the inner side of the working surface baffle 19 is provided with a working surface roadway 18 which is transversely arranged, the air inlet roadway 9a and the air return roadway 9b are respectively communicated with two ends of the working surface roadway 18 to form a U-shaped ventilation structure, the lower part of the working surface baffle 19 is uniformly distributed with a plurality of air leakage holes 21 which are communicated with the working surface roadway, and the air inlet roadway, the air return roadway, the working surface roadway and the air leakage holes form a simulated air leakage system of a goaf;
the sliding direction of the pulley is determined as longitudinal direction, and the direction perpendicular to the sliding direction of the pulley on the horizontal plane is determined as transverse direction.
In order to ensure the use effect, the lower ends of the thermocouple 22 and the exhaust tube 23 extend out of the exhaust temperature measuring hole 20b, the output end of the thermocouple is connected with the temperature collector, the lower end of the exhaust tube 23 is connected with the vacuum pump, and a seal 24 is arranged among the thermocouple 22, the exhaust tube and the exhaust temperature measuring hole. The exhaust temperature measuring channel 32b can be arranged by adopting a steel pipe 26. And a seal 24 is arranged between the inner wall of the steel pipe 26 and the thermocouple and the exhaust tube.
The pulley 2 comprises a fixing rib 33, a support plate 34 welded on the fixing rib, a rotating shaft 35 transversely arranged on the support plate and a pulley 8 arranged on the rotating shaft through a bearing, and the top plate 10 is horizontally arranged on the top of the fixing rib and the top of the support plate.
The top plate 10 and the working face baffle plate 19 are connected together through a connecting piece 27.
The box 1 be by the alternate bottom plate 6 and the apron 12 that set up of level and the cuboid hollow structure that front panel 11a, rear panel 11b and the curb plate 11c of left and right both sides constitute of vertical setting between bottom plate 6 and roof 12, be provided with strengthening rib 17 on the box 1, strengthening rib 17 can adopt the channel-section steel preparation, front panel 11a, rear panel 11b and curb plate 11c can adopt the preparation of transparent ya keli board, the condition in the observation box that can understand.
The front panel of the box body 1 is provided with a transverse support 16 corresponding to the jack, the base of the jack 14 is fixed with a vertical baffle 13 at the front end of the pulley, the piston rod of the jack is vertically opposite to the surface of the transverse support 16, and a square timber 15 for extending the support distance is arranged between the transverse support 16 and the piston rod of the jack.
The box body 1 and the track 7 are arranged on the support column 5.
Each group of heating holes 20a has 3 heating holes which are evenly distributed along the transverse direction of the bottom plate.
The top surface of the bottom similar rock stratum 3a is covered with a thin coal layer with the thickness of 5 mm.
A fully mechanized working face heterogeneous goaf flow field simulation experiment method comprises the following steps:
A. installation simulation experiment device
The simulation experiment device comprises a box body 1, the box body 1 is of a hollow structure, a pulley access 29 which is through from inside to outside is arranged on a front panel 11a of the box body, a rail 7 which extends out of the box body along the pulley access 29 is horizontally arranged in the box body, a pulley 2 is arranged on the rail 7, a jack 14 which is used for driving the pulley 2 to slide along the rail is arranged on the pulley 2, a horizontal top plate 10 is arranged at the top of the pulley 2, a working face baffle 19 which extends downwards is arranged at the front end of the top plate 10, side baffles 30 which vertically extend downwards are arranged on two sides of the top plate 10, bottom similar rock strata 3a are filled in the box body below the lower end face of each side baffle 30, a coal seam 4 with the top face higher than the upper face of the top plate is filled between each working face baffle, each side baffle and the inner wall of the box body, the coal seam with the higher part extends to the upper face of the top plate and covers the upper face of the top plate, the box body above the coal seam 4 is filled with the top similar rock strata 3b, and the top plate, and the working face baffles and the bottom similar rock strata jointly surround a simulation coal seam space 31;
the inner side surfaces of the side baffles 30 at two sides are respectively provided with an air inlet roadway 9a and an air return roadway 9b which are longitudinally arranged, the inner side of the working surface baffle 19 is provided with a working surface roadway 18 which is transversely arranged, the air inlet roadway 9a and the air return roadway 9b are respectively communicated with two ends of the working surface roadway 18 to form a U-shaped ventilation structure, the lower part of the working surface baffle 19 is uniformly distributed with a plurality of air leakage holes 21 which are communicated with the working surface roadway, the air inlet roadway, the air return roadway, the working surface roadway and the air leakage holes form a simulated air leakage system of a goaf, and an air outlet of the air return roadway 9b is connected with an air blower;
a plurality of groups of heating holes 20a are uniformly distributed on a bottom plate 6 of the box body 1 along the sliding direction (longitudinal direction) of the pulley, a heating channel 32a communicated with the simulated coal seam space 31 is arranged in a bottom similar rock stratum above the heating holes 20a, a heating pipe 25 is arranged in the heating channel 32a, a plurality of air-extracting temperature-measuring holes 20b are uniformly distributed on the bottom plate around the heating holes 20a, an air-extracting temperature-measuring channel 32b communicated with the simulated coal seam space 31 is arranged in the bottom similar rock stratum above the air-extracting temperature-measuring holes 20b, and a thermocouple 22 and an air-extracting pipe 23 are respectively arranged in the air-extracting temperature-measuring channel 32 b;
the lower ends of the thermocouple 22 and the exhaust tube 23 extend out of the exhaust temperature measuring hole 20b, the output end of the thermocouple is connected with the temperature collector, the lower end of the exhaust tube 23 is connected with the vacuum pump, and a seal 24 is arranged among the thermocouple 22, the exhaust tube and the exhaust temperature measuring hole;
the coal bed is dry bulk coal mined from a working face of a field test, and the similar rock strata are formed by mixing and paving sand, gypsum powder, calcium carbonate powder, borax and water according to different proportions.
When the pulley is installed, the pulley is firstly pulled out of the box body, a heating pipe, a thermocouple and an exhaust pipe are arranged on a bottom plate of the box body, the thermocouple and the exhaust pipe are protected by a steel pipe and are arranged in a hole together, and the thermocouple and the exhaust pipe are fixed by threads; pushing the pulley into the box body, enabling the upper ends of the heating pipe, the thermocouple and the exhaust pipe to be lower than the lower end surfaces of the working face baffle and the side baffle, pulling the pulley out of the box body, paving a bottom similar rock stratum 3a on a bottom plate, paving a coal bed with the thickness of 5mm on the similar rock stratum, moving the pulley back and forth in the box body, enabling the coal bed with the thickness of 5mm on the upper part of the similar rock stratum to be in close contact with the lower end surfaces of the working face baffle and the side baffle, pushing the pulley to the innermost end of the box body, filling a coal bed 4 with the top surface higher than the upper surface of the top plate between the working face baffle, the side baffle and the inner wall of the box body, extending the coal bed with the higher part to the upper surface of the top plate and covering the upper surface of the top plate, and filling a top similar rock stratum 3b on the coal bed;
B. simulated mining
According to the design step pitch and the design interval time, the pulley is moved by the jack to form a simulated goaf, and simultaneously, the air blower is started, and the air flow enters from the air inlet roadway 9a and passes throughThe working face passing roadway 18 is discharged from the air return roadway 9b, and when passing through the working face roadway, the air current leaks to the goaf through the air leakage holes 21 to form a goaf air leakage flow field; along with the movement of the pulley, the similar rock stratum at the top loses the support of the top plate, the mine pressure effect is gradually increased, when the damage limit of the similar rock stratum at the top is reached, deformation damage is generated until caving is generated, so that the scene of caving of a goaf is simulated, after the similar rock stratum at the top begins to caving, a heating pipe below a caving area is started, the temperature is raised to 200-300 ℃, meanwhile, the real-time temperature of the goaf is monitored through a thermocouple, the caving area is subjected to air extraction sampling through an exhaust pipe at certain intervals (such as intervals of 5-10 minutes), and information is numbered and remarked, collected gas samples are transported to a gas chromatograph for laboratory, the gas components are analyzed, and O is analyzed 2 、N 2 、CO、CO 2 、CH 4 、C 2 H 6 、C 2 H 4 、C 3 H 8 、C 2 H 2 And the volume fraction of the gas is equal, so that the goaf temperature and the gas experimental data can be obtained. The obtained temperature monitoring information and data obtained by air extraction analysis are gathered together, so that the change rule of the spontaneous combustion fire source physical and chemical parameters of the goaf coal can be obtained, the change rule of the goaf gas thermal field in the goaf spontaneous combustion process is disclosed, and the result of similar simulation has great significance for identifying the spontaneous combustion state, gas products and migration rule of the goaf and preventing and treating the spontaneous combustion catastrophe of the goaf coal.
If the change rule of the goaf gas flow field under the cold state experiment condition is researched, the reserved holes on the box body bottom plate can be used as gas release sources, and other reserved holes can be used as exhaust pipes for air exhaust analysis and test, so that the goaf gas flow field gas volume fraction distribution rule under different gas release sources and ventilation conditions can be obtained.
As known by the technical personnel in the field, for a similar simulation experiment device, the most key is to improve the similarity between the experiment device and the site, so that the made experiment result has reference significance, the similar coal strata are laid on a box body and a pulley according to the condition of the site coal strata, the size design of the device meets geometric similarity, the coal mining process is simulated by pushing and pulling the pulley, the movement parameters of the pulley can be regulated and controlled according to the actual condition, after the overlying coal strata lose the support of the pulley, the deformation and the damage are generated by the dead weight until the caving are realized, the whole process is natural caving, and the similarity between the formed heterogeneous goaf and the site is greatly improved; laying a U-shaped ventilation pipeline at the lower part of the pulley, realizing extraction type ventilation by utilizing an air blower, meeting the requirements of power similarity and motion similarity by the device, uniformly distributing a plurality of groups of air leakage holes in the goaf direction of a roadway on a working face to simulate air leakage, and ensuring high similarity between stope space ventilation and air leakage and a site; the heating pipes are arranged at the bottom of the box body to heat float coal to simulate a coal spontaneous combustion high-temperature point, meanwhile, air leakage of the gob is simulated, the float coal is heated in an anoxic environment to generate gas heat and is spread and transported in the heterogeneous gob, the similarity between the gas spread and transport environment in the gob and the field is high, and the acquired gob gas heat field change rule can better guide the identification and prevention and control of a field gob coal spontaneous combustion fire source; by using the reserved holes at the bottom of the box body as gas release sources and other reserved holes at the bottom as air extraction holes, the goaf gas concentration distribution rules under different gas release sources and ventilation conditions can be obtained, and the method has guiding significance for preventing and controlling goaf gas disasters; the device has the advantages of easy selection of processing materials, low cost, reliable structure and easy operation, and the heating pipe, the thermocouple and the exhaust pipe are arranged from the bottom plate and are easy to replace after being damaged. Overall, the device meets the requirements of geometric similarity, dynamic similarity and motion similarity, the obtained experimental result has high reliability, the device can be used for accurately obtaining the physical and chemical parameters of the spontaneous combustion fire source of the coal in the goaf and the gas concentration distribution rule of the goaf, the experimental result can better guide the positioning of the spontaneous combustion fire source of the coal in the goaf on site and the gas disaster prevention and control of the goaf, and the device and the method are an innovation in a goaf flow field simulation experimental device and a method and have good social and economic benefits.
Claims (6)
1. A fully mechanized working face heterogeneous goaf flow field simulation experiment device is characterized by comprising a box body (1), wherein the box body (1) is of a hollow structure, a pulley access (29) which is through from inside to outside is arranged on a front panel (11 a) of the box body, a track (7) which extends out of the box body along the pulley access (29) is horizontally arranged in the box body, a pulley (2) is arranged on the track (7), a jack (14) which is used for driving the pulley (2) to slide along the track is arranged on the pulley (2), a horizontal top plate (10) is arranged at the top of the pulley (2), a working face baffle (19) which extends downwards is arranged at the front end of the top plate (10), side baffles (30) which vertically extend downwards are arranged on two sides of the top plate (10), a bottom similar rock stratum (3 a) is filled in the box body below the lower end face of the side baffles (30), a coal seam (4) which is higher than the top plate is filled between the working face baffle, the side baffles and the inner wall of the box body, the coal seam (4) which is higher than the top plate extends to the upper surface of the top plate and covers the top surface of the top plate, a top plate in the box body above the coal seam (4), and a top similar rock stratum (3 b) in the box body is filled with the top plate, the working face, the side baffles, and the coal seam space (31) are enclosed into a simulated space (31);
a plurality of groups of heating holes (20 a) which are uniformly distributed are formed in a bottom plate (6) of the box body (1) along the sliding direction of the pulley, a heating channel (32 a) communicated with the simulated coal seam space (31) is arranged in a bottom similar rock stratum above the heating holes (20 a), a heating pipe (25) is arranged in the heating channel (32 a), a plurality of air-extracting temperature-measuring holes (20 b) which are uniformly distributed are formed in the bottom plate around the heating holes (20 a), an air-extracting temperature-measuring channel (32 b) communicated with the simulated coal seam space (31) is arranged in the bottom similar rock stratum above the air-extracting temperature-measuring holes (20 b), and thermocouples (22) and an air-extracting pipe (23) are respectively arranged in the air-extracting temperature-measuring channel (32 b);
the inner side surfaces of the side baffles (30) at two sides are respectively provided with an air inlet roadway (9 a) and an air return roadway (9 b) which are longitudinally arranged, the inner side of the working surface baffle (19) is provided with a working surface roadway (18) which is transversely arranged, the air inlet roadway (9 a) and the air return roadway (9 b) are respectively communicated with two ends of the working surface roadway (18) to form a U-shaped ventilation structure, the lower part of the working surface baffle (19) is uniformly distributed with a plurality of air leakage holes (21) which are communicated with the working surface roadway, and the air inlet roadway, the air return roadway, the working surface roadway and the air leakage holes form a simulated air leakage system of the goaf;
the lower ends of the thermocouple (22) and the exhaust tube (23) extend out of an exhaust temperature measuring hole (20 b), the output end of the thermocouple is connected with a temperature collector, the lower end of the exhaust tube (23) is connected with a vacuum pump, and a seal (24) is arranged among the thermocouple, the exhaust tube and the exhaust temperature measuring hole;
tackle (2) including fixed muscle (33), welding backup pad (34) on fixed muscle, transversely set up pivot (35) in the backup pad and through pulley (8) of bearing setting in the pivot, roof (10) level set up at fixed muscle and backup pad top.
2. The comprehensive caving face heterogeneous goaf flow field simulation experiment device according to claim 1, characterized in that the box body (1) is a cuboid hollow structure composed of bottom plates (6) and cover plates (12) which are horizontally arranged at intervals, and a front panel (11 a), a rear panel (11 b) and side plates (11 c) at left and right sides which are vertically arranged between the bottom plates (6) and the cover plates (12).
3. The comprehensive caving face heterogeneous goaf flow field simulation experiment device as claimed in claim 1, wherein a transverse support (16) corresponding to a jack is arranged on a front panel of the box body (1), a base of the jack (14) is fixed with a vertical baffle (13) at the front end of the pulley, a piston rod of the jack is vertically opposite to the surface of the transverse support (16), and a square timber (15) for extending the support distance is arranged between the transverse support (16) and the piston rod of the jack.
4. The comprehensive caving face heterogeneous goaf flow field simulation experiment device according to claim 1, characterized in that the box body (1) and the rail (7) are both arranged on the pillar (5).
5. The experimental device for simulating the flow field of the heterogeneous goaf of the fully mechanized caving face as claimed in claim 1, wherein 3 heating holes (20 a) are uniformly distributed along the transverse direction of the bottom plate.
6. The comprehensive caving face heterogeneous goaf flow field simulation experiment device as claimed in claim 1, wherein the top surface of the bottom similar rock stratum (3 a) is covered with a thin coal seam with thickness of 5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710740937.6A CN107328551B (en) | 2017-08-25 | 2017-08-25 | Fully mechanized working face heterogeneous goaf flow field simulation experiment device |
Applications Claiming Priority (1)
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| CN108333291B (en) * | 2018-02-01 | 2020-09-15 | 山东科技大学 | Experimental device and experimental method for simulating goaf natural ignition |
| CN109083677B (en) * | 2018-11-05 | 2023-08-25 | 河南工程学院 | Coal seam goaf gas extraction spontaneous combustion simulation experiment device |
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