CN110161083B - System and method for distributing water in gas-containing coal imbibition process under test overburden condition - Google Patents
System and method for distributing water in gas-containing coal imbibition process under test overburden condition Download PDFInfo
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- CN110161083B CN110161083B CN201910505337.0A CN201910505337A CN110161083B CN 110161083 B CN110161083 B CN 110161083B CN 201910505337 A CN201910505337 A CN 201910505337A CN 110161083 B CN110161083 B CN 110161083B
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- 239000003245 coal Substances 0.000 title claims abstract description 271
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 200
- 238000012360 testing method Methods 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000005213 imbibition Methods 0.000 title claims abstract description 28
- 230000008569 process Effects 0.000 title claims abstract description 27
- 238000003825 pressing Methods 0.000 claims abstract description 59
- 238000011068 loading method Methods 0.000 claims abstract description 53
- 238000003795 desorption Methods 0.000 claims abstract description 43
- 230000007246 mechanism Effects 0.000 claims abstract description 41
- 238000009826 distribution Methods 0.000 claims abstract description 17
- 238000004378 air conditioning Methods 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims description 60
- 238000007789 sealing Methods 0.000 claims description 59
- 239000007789 gas Substances 0.000 claims description 48
- 239000004696 Poly ether ether ketone Substances 0.000 claims description 40
- JUPQTSLXMOCDHR-UHFFFAOYSA-N benzene-1,4-diol;bis(4-fluorophenyl)methanone Chemical compound OC1=CC=C(O)C=C1.C1=CC(F)=CC=C1C(=O)C1=CC=C(F)C=C1 JUPQTSLXMOCDHR-UHFFFAOYSA-N 0.000 claims description 40
- 229920002530 polyetherether ketone Polymers 0.000 claims description 40
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 38
- 239000011248 coating agent Substances 0.000 claims description 27
- 238000000576 coating method Methods 0.000 claims description 27
- 239000001307 helium Substances 0.000 claims description 18
- 229910052734 helium Inorganic materials 0.000 claims description 18
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 18
- 239000002184 metal Substances 0.000 claims description 18
- 238000003860 storage Methods 0.000 claims description 18
- 238000002347 injection Methods 0.000 claims description 14
- 239000007924 injection Substances 0.000 claims description 14
- 238000001125 extrusion Methods 0.000 claims description 11
- 239000003921 oil Substances 0.000 claims description 9
- 238000009849 vacuum degassing Methods 0.000 claims description 9
- 150000001875 compounds Chemical class 0.000 claims description 7
- 238000003466 welding Methods 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 abstract description 4
- 239000011435 rock Substances 0.000 abstract description 3
- 238000010998 test method Methods 0.000 abstract description 3
- 239000003973 paint Substances 0.000 description 16
- 238000001035 drying Methods 0.000 description 14
- 238000001179 sorption measurement Methods 0.000 description 10
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- 238000007906 compression Methods 0.000 description 4
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- 238000005303 weighing Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000012153 distilled water Substances 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000006855 networking Effects 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 239000004484 Briquette Substances 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000005481 NMR spectroscopy Methods 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
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- 238000000429 assembly Methods 0.000 description 1
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- 230000004888 barrier function Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000001225 nuclear magnetic resonance method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 238000009736 wetting Methods 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
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/041—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/048—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance for determining moisture content of the material
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- General Health & Medical Sciences (AREA)
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Abstract
The invention relates to a moisture distribution system in a gas-containing coal imbibition process under a test cover rock condition, which comprises an air conditioning device, a coal sample tank device, an isobaric water adding device, an isobaric desorption device, a resistance test device, a cover pressure loading device, a molded coal pressing device, a control valve and a control system, wherein the coal sample tank device and the isobaric water adding device are mutually connected in series through a flow guide pipe, the coal sample tank device and the isobaric water adding device are respectively communicated with the air conditioning device and the isobaric desorption device through the flow guide pipe, the coal sample tank device is electrically connected with the resistance test device through wires, and a plurality of control valves are uniformly distributed on the flow guide pipe and are respectively communicated with the air conditioning device, the coal sample tank device, the isobaric water adding device, the isobaric desorption device and the cover pressure loading device through the control valve. The test method is simple, convenient and accurate, has high similarity with the actual occurrence of the coal seam, can realize dynamic monitoring, and lays a theoretical foundation for further researching the mechanism of preventing and controlling the outburst of coal and gas by using the hydraulic measure.
Description
Technical Field
The invention belongs to the technical field of coal mine safety, and particularly relates to a method and a device for distributing moisture in a gas-containing coal imbibition process under a test cover rock condition.
Background
The water injection process of the coal bed is actually a process of imbibition of external moisture in the coal body, and imbibition promotes gas desorption of the coal body, so that the gas content of the coal bed is reduced, the gas extraction rate is improved, the number of times of outburst and overrun of gas caused by outburst of coal and gas is reduced, and due to anisotropy of the coal body, water is unevenly distributed in a wetting range around a drilling hole in the water injection process of the coal bed, so that the residual gas content in the coal body is different, and the residual gas content is different in standard reaching areas, and the barriers prevent the development of outburst elimination measures of the water injection of the coal bed.
The method for measuring the moisture comprises a drying method, an infrared method, a ray method, a microwave method, a nuclear magnetic resonance method and a numerical simulation method, wherein the drying method damages the coal body, and the moisture distribution of the coal body containing the gas cannot be continuously and dynamically detected; in the process of detecting the moisture of the coal body by the infrared method, the non-moisture component in the coal also absorbs infrared rays, so that the measurement result is deviated; the radiation method needs to introduce a radiation source and high-power voltage equipment, so that the radiation method has certain potential safety hazard, the equipment is high in price and difficult to maintain, the scattering property of hydrogen is unstable, and if the shielding is poor, the radiation leakage is easily caused by the method, the environment is polluted, and the human is endangered; the microwave method is more difficult to test and accurate for low water content, the coal sample tank is a steel product, and the energy of microwaves is absorbed; nuclear magnetic resonance is limited by echo time, so that signals lower than the echo time cannot be detected; the numerical simulation method is to obtain qualitative or quantitative distribution of water on the basis of a certain assumption, and is limited by boundary conditions, so that the water distribution under the real condition can not be reflected.
Therefore, if the water distribution in the gas-containing coal imbibition process under the overburden condition is accurately measured in a laboratory, it is necessary to establish a method and a device for testing the water distribution in the gas-containing coal imbibition process under the overburden condition, the risk is low, the testing method is convenient and accurate, the upper water addition or the lower water addition can be realized, the actual occurrence similarity with the coal seam is high, meanwhile, the upper dynamic monitoring can be realized, and a theoretical basis is laid for the deep research of the hydrodynamic measure outburst prevention mechanism.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides a system and a method for testing the moisture distribution in the gas-containing coal imbibition process under the overburden condition.
In order to achieve the above object, the present invention is realized by the following technical scheme:
the water distribution system comprises an air conditioner device, a coal sample tank device, an isobaric water adding device, an isobaric desorption device, a resistance testing device, a pressure-covering loading device, a molded coal pressing device, a control valve and a control system, wherein the coal sample tank device and the isobaric water adding device are mutually connected in series through a flow guide pipe, the coal sample tank device and the isobaric water adding device are respectively communicated with the air conditioner device and the isobaric desorption device through the flow guide pipe, the isobaric desorption device is additionally communicated with the pressure-covering loading device, the coal sample tank device is additionally electrically connected with the resistance testing device through a lead, a plurality of control valves are uniformly distributed on the flow guide pipe, and are respectively communicated with the air conditioner device, the coal sample tank device, the isobaric water adding device, the isobaric desorption device and the pressure-covering loading device through the control valve, and the pressure-covering loading device through the lead, and the control system is respectively connected with the air conditioner device, the sample tank device, the pressure-covering loading device and the control valve.
Further: the air regulating device comprises a methane inflating mechanism, a helium calibrating mechanism and a vacuum degassing mechanism;
the methane inflation mechanism comprises a high-pressure methane bottle, a valve, a buffer tank, a tee joint, a pressure sensor, a pipeline and a signal wire, wherein the high-pressure methane bottle is connected with the valve through the pipeline, the valve) is connected with the buffer tank through the pipeline, the buffer tank is connected with the right port of the tee joint through the pipeline, the lower port of the tee joint is connected with the pressure sensor, the pressure sensor is connected with the control system through the signal wire, the control system is connected with the control system through the signal wire, the left port of the tee joint is connected with the valve through the pipeline, and the valve is connected with the right port of the four-way joint through the pipeline;
the helium calibration mechanism comprises a helium bottle, a pressure reducing valve, a buffer tank, a tee joint, a pressure sensor, a pipeline and a signal wire, wherein the helium bottle is connected with the pressure reducing valve through the pipeline, the pressure reducing valve is connected with the valve through the pipeline, the valve is connected with the buffer tank through the pipeline, the buffer tank is connected with the right port of the tee joint through the pipeline, the upper port of the tee joint is connected with the pressure sensor, the pressure sensor is connected with the control system (200) through the signal wire, the left port of the tee joint is connected with the valve through the pipeline, and the valve is connected with the upper port of the four-way joint through the pipeline;
The vacuum degassing mechanism comprises a vacuum pump, a compound vacuum gauge and a valve, wherein the vacuum pump is connected with a lower port of a tee joint through a pipeline, a left port of the tee joint is connected with the compound vacuum gauge through a vacuum silicon pipe, an upper port of the tee joint is connected with the valve through a pipeline, the valve is connected with a lower port of the four joint through a pipeline, the methane inflating mechanism, the helium calibrating mechanism and the vacuum degassing mechanism are jointly connected to the four joint, a left port of the four joint is connected with a right port of the four joint through a pipeline, a lower port of the four joint is connected with a pressure sensor, the pressure sensor is connected with a control system through a signal line, an upper port of the four joint is connected with the valve, and a left port of the four joint is connected with a coal sample tank device through a pipeline.
Further, the coal sample tank device comprises a sample tank upper cover, a coal sample tank cylinder, a threading sealing assembly, a piston, a coal sample tank lower cover and a coal sample tank bracket;
the center of the upper cover of the coal sample tank is provided with an upper water adding port, the upper part of the upper water adding port is connected with an isobaric water adding device through a pipeline, the lower part of the upper water adding port is communicated with a vertical hole, the right side of the upper cover of the coal sample tank is provided with a gas injection port, the gas injection port is connected with a left port of a four-way joint through a pipeline, the tail end of the gas injection port is communicated with the vertical hole, the left side of the upper cover of the coal sample tank is provided with a desorption port, the tail end of the desorption port is communicated with the vertical hole, the desorption port is connected with an isobaric desorption device and the isobaric water adding device through a pipeline, the vertical hole and the vertical hole are respectively communicated with a metal mesh with a certain thickness, the periphery of the metal mesh is connected with the lower end face of the upper cover of the coal sample tank through welding, the outer edge of the metal mesh is provided with an O-shaped ring, and six inner hexagon bolt holes are uniformly distributed along the circumference;
Six inner hexagon bolt holes are uniformly formed in the upper end face of the coal sample tank body along the circumference, the six inner hexagon bolt holes of the coal sample tank body and the six inner hexagon bolt holes of the coal sample tank upper cover are in matched connection through inner hexagon bolts, ribs with the height of 3mm are arranged on the inner sides of the six inner hexagon bolt holes of the upper end face of the coal sample tank body, extrusion sealing is formed by the ribs with the height of 3mm and O-shaped rings, four layers of two rows of threading sealing assembly connecting holes are formed in the side wall of the coal sample tank body, an included angle between the two connecting holes of each row of threading sealing assemblies is 90 degrees, the threading sealing assembly is in matched connection with the side wall hole of the coal sample tank body through threads, smooth surfaces and O-shaped rings, the six inner hexagon bolt holes are uniformly formed in the lower end face of the coal sample tank body along the circumference, and the inner sides of the six inner hexagon bolt holes of the lower end face of the coal sample tank body are provided with the height of 3 mm;
the threading sealing assembly consists of a pressing cap, an electrode joint, an upper gasket, a PEEK material pressing sheet, a tetrafluoro material sealing piece, a PEEK material lower gasket, an O-shaped ring and a paint bubble line, wherein the electrode joint is hollow, a thread is arranged on the outer side of the middle part of the electrode joint, a smooth surface is arranged on the outer side of the lower part of the electrode joint, the O-shaped ring is arranged in the smooth surface, the inner side of the electrode joint is connected with the pressing cap through the thread, the left side of the pressing cap is provided with the hollow upper gasket, the left side of the hollow upper gasket is provided with the PEEK material pressing sheet, the left side of the PEEK material pressing sheet is provided with the tetrafluoro material sealing piece, the central axes of the PEEK material pressing sheet, the tetrafluoro material sealing piece and the PEEK material lower gasket are on the same horizontal straight line, a plurality of holes can be drilled on the PEEK material pressing sheet, the tetrafluoro material sealing piece and the PEEK material lower gasket, the number is determined according to the requirement, the number needs to be ensured on the same horizontal straight line when drilling holes, the paint bubble line is connected with the PEEK material pressing sheet, the PEEK material pressing sheet and the PEEK material lower gasket through the holes, and the PEEK material sealing piece are at the same layer line, and the same input end is a public;
The piston is in a hollow T shape, the upper end face of the transverse part of the T shape is provided with a metal net with a certain thickness, the periphery of the metal net is connected with the upper end face of the transverse part of the T shape through welding, the metal net is communicated with the lower water inlet through a vertical hole, the transverse part of the T shape is contacted with the inner wall of the coal sample tank body through an O-shaped ring, one section of the vertical part of the T-shaped cylinder is in a smooth plane, and the lowest section of the vertical part of the T-shaped cylinder is a hexagonal nut;
six inner hexagon bolt holes are uniformly formed in the lower end face of the lower cover of the coal sample tank, the six inner hexagon bolt holes are in matched connection with the six inner hexagon bolt holes in the lower end face of the coal sample tank body through inner hexagon bolts, a central hole is formed in the inner side of each inner hexagon bolt hole, the central hole is equal in diameter to a T-shaped vertical cylinder of a piston, an O-shaped ring is arranged on the side wall of each central hole, extrusion sealing is formed between each O-shaped ring and the T-shaped vertical cylinder of the piston, a vertical hole is formed in the left side of each central hole, the vertical hole is communicated with a pressure-covering loading port, and the pressure-covering loading port is connected with a pressure-covering loading device through a pipeline;
the upper end face of the coal sample tank support is provided with a central hole, the central hole is equal in diameter to the T-shaped vertical smooth cylinder of the piston, the coal sample tank lower cover and the T-shaped vertical cylinder of the piston are placed on the coal sample tank support through the central hole of the coal sample tank support, and the coal sample tank support is placed in the incubator.
Further, the isobaric water adding device comprises an advection pump, a water storage tank, a water adding piston container, a valve and a pipeline, wherein the water storage tank is connected with the advection pump through the pipeline, the advection pump is connected with the valve through the pipeline, the valve is connected with the lower port of the four-way valve, the upper port of the four-way valve is connected with the lower inlet of the water adding piston container, the right port of the four-way valve is connected with the valve through the pipeline, the left port of the four-way valve is connected with the valve through the pipeline, the upper port of the three-way valve is connected with the lower inlet of the water adding piston container, the left port of the three-way valve is connected with the valve through the pipeline, the right port of the three-way valve is connected with the valve through the pipeline, the upper port of the three-way valve is connected with the valve through the pipeline, the right port of the three-way valve is connected with the valve, and the upper inlet of the water adding piston container of the lower port of the three-way valve is connected with the left port of the three-way valve;
the water adding piston container comprises a cylinder body, an upper water adding piston container cover, a lower water adding piston container cover, a plug, a water adding piston, a hollow constant volume rod, a pull rod, a cap and a flange, wherein the upper end of the cylinder body is fixedly connected with the upper water adding piston container cover through threads, a hole is formed in the center of the upper water adding piston container cover, two threaded holes are formed in the outer side of the center hole, the holes are fixedly connected with the pull rod, the pull rod is centrally symmetrical relative to the upper water adding piston container cover, the pull rod is fixedly connected with the hole in the flange through a nut, the lower end of the cylinder body is fixedly connected with the lower water adding piston container cover through threads, the center of the lower water adding piston container cover is provided with a hole, the plug is in matched connection with the lower water adding piston container cover through the hole, the plug is in extrusion sealing with the inner wall of the cylinder body through the sealing ring, the upper end face of the plug is concave, the hole is formed in the lower end face of the plug, the hole is connected with the upper end face of the four-way, the side wall of the hollow constant volume piston is arranged above the plug, the upper end face of the hollow constant volume rod is connected with the hollow constant volume rod through the upper end face of the hollow constant volume rod, the hollow constant volume rod is connected with the hollow flange, and the hollow constant volume rod is in the hollow end cap is in the hollow end-shaped container, and is in the hollow and is connected with the hollow end face of the hollow container.
Further, isobaric desorption device include valve, back pressure valve, pipeline, pressure sensor, tee bend, hand pump and hand pump water storage tank constitute, valve one end is passed through the pipeline and is linked to each other with the left port of tee bend, the valve other end is connected with the air inlet of back pressure valve, the gas outlet of back pressure valve is connected with the desorption appearance through the pipeline, the water inlet of back pressure valve (the water inlet of back pressure valve links to each other with the left port of cross, the lower port of cross is connected with the sensor, the left port of cross is connected with the valve, the valve is connected with hand pump, hand pump is connected with the valve, the valve is connected with hand pump water storage tank.
Further, the resistance testing device comprises a multi-channel resistance tester, a resistance testing wire and a quick connector, wherein the quick connector is fixedly connected with the paint bubble wire through a screw, the quick connector is connected with the multi-channel resistance tester through the resistance testing wire, and the resistance tester is connected with the control system through a signal wire.
Further, the pressure-coating loading device comprises a pipeline, a tee joint, a pressure-coating loading sensor, a pressure-coating loading pump and an oil storage tank, wherein the left port of the tee joint is connected with the pressure-coating loading port, the upper port of the tee joint is connected with the pressure-coating loading sensor, the left port of the tee joint is connected with a valve, the valve is connected with the pressure-coating loading pump, the pressure-coating loading pump is connected with the valve, and the valve is connected with the oil storage tank.
Further, the molded coal pressing device comprises a servo control mechanism, a column with threads, an upper pressing plate, a lower pressing plate, a table top, an empty case body, a hydraulic jack, a pressure head and a molded coal die, wherein the servo control mechanism is connected with the hydraulic jack through an oil pipe, the hydraulic jack is fixedly connected with the center of the table top, the table top is fixedly connected with the empty case body, the table top is fixedly connected with the lower pressing plate, a groove is formed in the center of the lower pressing plate, the upper pressing plate is connected with the column with threads through threads, the column with threads is fixedly connected with the ground, and the molded coal die consists of a coal sample tank body and a coal sample tank upper cover.
Further, the control system is a circuit system based on any one or two of an industrial computer and a personal computer, and the control system is additionally provided with a network communication device.
The test method for testing the moisture distribution system in the gas-containing coal imbibition process under the overburden condition comprises the following steps:
s1, equipment is assembled, namely an air regulating device, a coal sample tank device, an isobaric water adding device, an isobaric desorption device, a resistance testing device, a pressure-covering loading device, a molded coal pressing device, a control valve and a control system which are formed by the invention are connected, and meanwhile, the control system is respectively connected with an external driving circuit and a data transmission network system to complete the novel assembly networking for standby;
S2, crushing fresh coal samples retrieved from a working surface, screening the crushed fresh coal samples, screening the coal samples with the particle size of 0-0.25 mm, placing the screened coal samples with the particle size of 0-0.25 mm in a drying oven for drying, setting the temperature of the drying oven to 105 ℃, testing the quality of granular coal every 0.5 hour until the quality is not changed, and then placing the granular coal in a dryer for cooling and standby; weighing a certain mass (m) 1 ) Adding 20% distilled water into the dried coal sample, uniformly stirring, wherein the coal sample after uniform stirring is m 1 * (1+20%) fixing the coal sample tank body and the upper cover of the coal sample tank by means of hexagon socket head cap bolts, and then inverting to obtain the molded coal die;
s3, adding the uniformly stirred partially moistened coal sample into a molded coal mold, inserting a pressure head into the molded coal mold after the addition, tamping up and down, pre-compacting, retaining the pressure head in the molded coal mold, and simultaneously weighing the mass (m 2 ) The mass of the added coal sample is m 1 *(1+20％)-m 2 ；
S4, the upper pressing plate of the servo universal testing machine is lowered until the distance from the upper end surface (2 mm of the upper end surface) of the pressure head is reached, the lowering is stopped, the servo control mechanism is started, the pressing load (sigma) and the pressure stabilizing time are set for 20min, a start testing button is clicked, the lower pressing plate moves upwards under the action of a hydraulic jack, the set pressure is reached, the pressure stabilizing stage is entered, the servo universal testing machine automatically supplements load when the pressure is lowered, and the servo universal testing machine automatically reduces load when the pressure is raised;
S5, after the pressure stabilizing time is finished, automatically releasing pressure by the servo universal testing machine, automatically separating the upper end face of the pressure head from the pressure plate, stopping the servo control mechanism after the servo universal testing machine completely releases pressure, taking out the molded coal die from the servo universal testing machine, taking out the pressure head from the molded coal die, inserting a graduated scale into the molded coal die, and reading the graduation h of the graduated scale from the orifice of the molded coal die 1 Due to the height h of the molded coal mold 2 It is known that the height of the pressed coal sample is h 1 -h 2 The mass of the coal sample per millimeter is (1.2 x m) 1 -m 2 )/(h 1 -h 2 )/10；
S6, because the lower edge of the first connecting hole of the plug wire sealing assembly is at a height (h) from the bottom of the molded coal die hole 3 ) The distance h between the upper surface of the molded coal sample and the lower edge of the first connecting hole of the plug wire sealing assembly can be calculated 3 -(h 1 -h 2 )；
S7, adding a certain mass of coal sample [ (1.2 x m) into the molded coal die again 1 -m 2 )/(h 1 -h 2 )]*[h 3 - (h 1 -h 2 )]*10, repeating the steps S3 to S7;
s8, punching holes in a PEEK material pressing sheet, a tetrafluoro material sealing piece and a PEEK material lower gasket, wherein the number of the holes can be determined according to the requirement, namely the number of paint bubble lines, inserting the PEEK material pressing sheet, the tetrafluoro material sealing piece and the PEEK material lower gasket which pass through the paint bubble lines into an electrode joint, then putting the upper gasket into the electrode joint, screwing a pressing cap into the electrode joint and compacting the electrode joint, simultaneously inserting another set of threading sealing assembly into another hole in the same layer of a coal sample tank barrel and screwing the other set of threading sealing assembly, arranging the paint bubble lines in a crisscross manner by adopting long tweezers, wherein one line is positioned at the center as a common input end, and the other lines are output ends;
S9, sequentially pressing a coal sample from bottom to top, arranging resistance measuring points, putting the coal sample into a drying oven for drying after the coal sample is pressed, putting a piston into a coal sample tank body after the drying is cooled, fixing a lower cover of the coal sample tank and the coal sample tank body through an inner hexagon bolt, pouring the connected coal sample tank on a coal sample tank bracket, respectively connecting an upper water adding port, a gas injection port, a decompression port and a pressure-covering loading port with a pipeline, and simultaneously connecting a paint bubble line) with a quick connector;
s10, opening a power switch of the incubator (setting the temperature as T, opening a switch of the pressure-covering loading pump, setting the pressure (sigma), opening a valve to cover the pressure-covering loading pump to start sucking emulsion, closing the valve after the emulsion is sucked, opening the valve, stopping the pressure-covering loading pump when the indication of the sensor is equal to (sigma), and keeping the pressure-covering loading pump continuously working when the indication of the sensor is smaller than (sigma);
s11, closing all valves in the pipeline, opening valves of the helium bottle, then adjusting the pressure reducing valve to ensure that the outlet pressure of the pressure reducing valve is equal to that of the helium bottle, opening the valve, flushing a certain amount of gas into the buffer tank, and reading out the indication (P after the indication of the pressure sensor is stable 1 ) Closing the valve (12), opening the valve, the valve and the valve, filling the gas in the buffer tank into the coal sample tank device, and reading the indication (P) after the indication of the pressure sensor is stable 2 ) Valve-to-valve volume (V 1 ) Has been previously calibrated according to the formula P 1 V 1 /Z 1 ＝P 2 V 2 /Z 2 Can calculate V 2 ，Z 1 、Z 2 Respectively P 1 、P 2 Compression factor under pressure, V 2 -V 1 The free volume between the valves is the free volume between the valves, the valves are opened, the gas in the pipeline is discharged, and then the valves are closed;
s12, opening a valve, starting a vacuum pump until the indication of the composite vacuum gauge is less than 10Pa, closing the valve, closing the vacuum pump, opening a valve of a methane bottle, opening the valve to charge a certain amount of gas into a buffer tank, and reading the indication (P 3 ) The inside of the coal sample tank device is inflated, and the indication (P) of the pressure sensor after inflation is read out 4 ) Closing the valve, observing whether the pressure in the coal sample tank reaches the adsorption equilibrium pressure after adsorption for a period of time, continuously filling air into the coal sample tank device if the pressure does not reach the adsorption equilibrium pressure, and recording the indication (P n ) The adsorbed methane amount isWherein Z is 3 、Z n Respectively P 3 、P n The compression factor, V, under pressure is known and is the volume between the valves;
S13, calculating the water adding percentage according to the mass of the coal sampleWater mass m 3 Setting water adding amount m in LED display panel of advection pump 3 Starting a horizontal flow pump, opening a valve, when water flows out from an outlet of the valve, indicating that the space in the hollow constant volume rod, the water adding piston and the plug is full of water, closing the valve, pushing the water adding piston to move upwards by water due to incompressibility of water, and screwing a cap and a cap to the lower end face and the upper end face of the flange respectively to fix the hollow constant volume rod after the water adding piston stops moving;
s14, opening a valve, rotating the hand pump anticlockwise, starting the hand pump to absorb water, closing the valve after the water absorption is finished, opening the valve, rotating the hand pump clockwise, enabling water to enter the back pressure valve, and when the indication number of the sensor is equal to the absorption equilibrium pressure P n When the hand pump is stopped rotating, the valve is closed;
s15, adding water to the coal sample tank system in an upper water adding mode and a lower water adding mode:
firstly, when upper water adding is adopted, gas is desorbed from the lower side of a coal sample tank device, a valve is closed, the valve is opened, the coal sample tank and a water adding piston container are integrated due to the incompressibility of water, the system pressure is still adsorption balance pressure at the moment, a multi-channel resistance tester is opened, the valve is opened, water in the water adding piston container enters a coal sample tank system through an upper water adding port under the action of self gravity, the water is subjected to imbibition effect in the coal body after isobaric water adding, the pressure in the coal sample tank device rises, when the pressure in the coal sample tank device is greater than the pressure type of a sensor, a back pressure valve is opened, the gas enters a desorption instrument (110) through a lower water adding port, a tee joint, the valve and the back pressure valve, and the multi-channel resistance tester can also measure the resistance between an output end and a public input end in the upper-lower imbibition process at the same time, and a calculation formula rho=RS/L is calculated through the resistivity, wherein rho is the resistivity, R is the resistance, S is the sectional area, and L is the length;
Secondly, when lower water adding is adopted, gas is desorbed from the upper side of a coal sample tank device, a valve is closed, the valve is opened, the coal sample tank and a water adding piston container are integrated due to incompressibility of water, the system pressure is still adsorption balance pressure, a multi-channel resistance tester is opened, the valve is opened, water in the water adding piston container enters a coal sample tank system through a lower water adding port under the action of self gravity, the water is subjected to imbibition effect in the coal body after isobaric water adding, the pressure in the coal sample tank device is increased, when the pressure in the coal sample tank device is greater than the pressure type of a sensor, a back pressure valve is opened, the gas enters the desorption instrument through a desorption port, the valve, a tee joint and the back pressure valve, and meanwhile, the resistance between each layer of output end and a public input end in the lower-upper imbibition process can be measured by a resistance tester with multiple channels, and the resistance calculation formula ρ=RS/L is resistivity, R is resistance, S is cross section area, and L is length;
s16, after obtaining the resistivity of the gas-containing coal in the imbibition process under the overburden condition, inverting to obtain the water distribution of the gas-containing coal in the imbibition process under the overburden condition through the corresponding relation between the existing water content and the resistivity.
Compared with the prior art, the invention has the following beneficial effects: the invention has low risk, convenient and accurate testing method and high similarity with the actual occurrence of the coal seam, can realize dynamic monitoring, and lays a theoretical foundation for further researching the hydrodynamics measure outburst prevention mechanism.
Drawings
The invention is described in detail below with reference to the drawings and the detailed description.
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic diagram of a coal sample tank device;
FIG. 3 is a schematic view of a threading seal assembly;
FIG. 4 is a schematic diagram of an isobaric water-adding device;
FIG. 5 is a schematic structural view of a briquette press apparatus;
FIG. 6 is a flow chart of the experimental method of the present invention.
Detailed Description
The invention is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the invention easy to understand.
The water distribution system in the gas-containing coal imbibition process under the condition of the test coverage rock as shown in the figures 1-5 is characterized in that: the moisture distribution system comprises an air conditioner device, a coal sample tank device, an isobaric water adding device, an isobaric desorption device, a resistance testing device, a pressure-covering loading device, a molded coal pressing device, a control valve and a control system in the gas-containing coal imbibition process under the test overburden condition, wherein the coal sample tank device and the isobaric water adding device are mutually connected in series through a guide pipe, the coal sample tank device and the isobaric water adding device are respectively communicated with the air conditioner device and the isobaric desorption device through the guide pipe, the isobaric desorption device is additionally communicated with the pressure-covering loading device, the coal sample tank device is additionally electrically connected with the resistance testing device through a wire, a plurality of control valves are uniformly distributed on the guide pipe and are respectively communicated with the air conditioner device, the coal sample tank device, the isobaric water adding device, the isobaric desorption device and the pressure-covering loading device through the control valve, and the control system 200 is respectively connected with the air conditioner device, the coal sample tank device, the isobaric water adding device, the pressure-covering desorption device, the resistance testing device and the pressure-covering loading device through the wire.
In this embodiment, the air conditioning device includes a methane aeration mechanism, a helium calibration mechanism, and a vacuum degassing mechanism;
the methane charging mechanism comprises a high-pressure methane bottle, a valve, a buffer tank, a tee joint, a pressure sensor, a pipeline and a signal line, wherein the high-pressure methane bottle (1) is connected with the valve (2) through the pipeline, the valve (2) is connected with the buffer tank (3) through the pipeline, the buffer tank (3) is connected with the right port of the tee joint (4) through the pipeline, the lower port of the tee joint (4) is connected with the pressure sensor (5), the pressure sensor (5) is connected with the control system (200) through the signal line, the left port of the tee joint (4) is connected with the valve (6) through the pipeline, and the valve (6) is connected with the right port of the four-way joint (9) through the pipeline;
the helium calibration mechanism comprises a helium bottle, a pressure reducing valve, a buffer tank, a tee joint, a pressure sensor, a pipeline and a signal line, wherein the helium bottle (10) is connected with the pressure reducing valve (11) through the pipeline, the pressure reducing valve (11) is connected with the valve (12) through the pipeline, the valve (12) is connected with the buffer tank (13) through the pipeline, the buffer tank (13) is connected with the right port of the tee joint (14) through the pipeline, the upper port of the tee joint (14) is connected with the pressure sensor (15), the pressure sensor (15) is connected with the control system (200) through the signal line, the left port of the tee joint (14) is connected with the valve (16) through the pipeline, and the valve (16) is connected with the upper port of the tee joint (9) through the pipeline;
The vacuum degassing mechanism comprises a vacuum pump, a compound vacuum gauge and a valve, wherein the vacuum pump (17) is connected with the lower port of the tee joint (19) through a pipeline, the left port of the tee joint (19) is connected with the compound vacuum gauge (18) through a vacuum silicon pipe, the upper port of the tee joint (19) is connected with the valve (20) through a pipeline, the valve (20) is connected with the lower port of the four-way (9) through a pipeline, the methane charging mechanism, the helium calibration mechanism and the vacuum degassing mechanism are connected with the four-way (9) together, the left port of the four-way (9) is connected with the right port of the four-way (21) through a pipeline, the lower port of the four-way (21) is connected with the pressure sensor (22), the pressure sensor (22) is connected with the control system (200) through a signal wire, the upper port of the four-way (21) is connected with the valve (23), and the left port of the four-way (21) is connected with the coal sample tank device through a pipeline.
In the embodiment, the coal sample tank device comprises a sample tank upper cover (24), a coal sample tank cylinder (25), a threading sealing assembly (26), a piston (27), a coal sample tank lower cover (28) and a coal sample tank bracket (29);
the center of the upper cover (24) of the coal sample tank is provided with an upper water adding port (30), the upper part of the upper water adding port (30) is connected with an isobaric water adding device through a pipeline, the lower part of the upper water adding port (30) is communicated with a vertical hole (31), the right side of the upper cover (24) of the coal sample tank is provided with an air injection port (32), the air injection port (32) is connected with the left port of the four-way (21) through a pipeline, the tail end of the air injection port (32) is communicated with a vertical hole (34), the left side of the upper cover (24) of the coal sample tank is provided with a desorption port (33), the tail end of the desorption port (33) is communicated with a vertical hole (35), the desorption port (33) is connected with an isobaric desorption device and an isobaric water adding device through a pipeline, the vertical hole (31), the vertical hole (34) and the vertical hole (35) are respectively communicated with a metal net (36) with a certain thickness, the periphery of the metal net (36) is connected with the lower end face of the upper cover (24) of the coal sample tank through a welding, the outer edge of the metal net (36) is provided with an O-shaped ring (37), and six inner hexagonal bolts (38) are uniformly distributed along the outer circumference of the hexagon;
Six inner hexagon bolt holes (39) are uniformly formed in the upper end face of the coal sample tank barrel (25) along the circumference, six inner hexagon bolt holes (39) of the coal sample tank barrel (25) are in matched connection with six inner hexagon bolt holes (38) of the coal sample tank upper cover through inner hexagon bolts (40), ribs with the height of 3mm are arranged on the inner side of the six inner hexagon bolt holes (39) of the upper end face of the coal sample tank barrel (25), extrusion sealing is formed by the ribs with the height of 3mm and O-shaped rings (37), four layers of two-row threading sealing assembly (26) connecting holes are formed in the side wall of the coal sample tank barrel (25), the included angle between two connecting holes of each row of threading sealing assembly (26) is 90 degrees, the threading sealing assembly (26) is in matched connection with the side wall holes of the coal sample tank barrel (25) through threads (41), smooth surfaces (42), O-shaped rings (43) and O-shaped rings (44), six inner hexagon bolt holes (45) are uniformly formed in the lower end face of the coal sample tank barrel (25), and the inner side wall of the six inner hexagon bolt holes (45) are uniformly arranged along the circumference, and the inner side edges of the six inner hexagon bolt holes (45) of the coal sample tank barrel (25) are arranged;
the threading sealing assembly (26) consists of a press cap (46), an electrode joint (47), an upper gasket (48), a PEEK material pressing sheet (49), a tetrafluoro material sealing piece (50), a PEEK material lower gasket (51), an O-shaped ring (43), an O-shaped ring (44) and a paint bubble line (52), wherein the electrode joint (47) is hollow, threads (41) are arranged on the outer side of the middle part of the electrode joint (47), a smooth surface (42) is arranged on the outer side of the lower part, the O-shaped ring (43) and the O-shaped ring (44) are arranged in the smooth surface (42), the inner side of the electrode joint (47) is connected with the press cap (46) through threads, the left side of the press cap (46) is provided with the hollow upper gasket (48), the left side of the hollow upper gasket (48) is provided with the PEEK material pressing sheet (49), the left side of the PEEK material pressing sheet (49) is provided with the tetrafluoro material sealing piece (50), the left side of the tetrafluoro material sealing piece (51) is provided with the material lower gasket (51), the PEEK material pressing sheet (49), the inner side of the PEEK material pressing sheet (50) and the same central axis line of the PEEK material (51) can be drilled on the same horizontal hole when the PEEK material (51) is required to be drilled on the flat hole, and the upper gasket (51 is required according to the number, the paint bubble lines (52) are connected with the PEEK material pressing sheet (49), the tetrafluoro material sealing piece (50) and the PEEK material lower gasket (51) through holes, wherein one paint bubble line is a common input end, and the other paint bubble lines are output ends;
The piston (27) is in a hollow T shape, the upper end face of the transverse part of the T shape is provided with a metal net (53) with a certain thickness, the periphery of the metal net (53) is connected with the upper end face of the transverse part of the T shape through welding, the metal net (53) is communicated with the lower water adding port (55) through a vertical hole (54), the transverse part of the T shape is contacted with the inner wall of the coal sample tank cylinder body (25) through an O-shaped ring (56) and an O-shaped ring (57), one section of the vertical part of the T-shaped cylinder is a smooth plane, and the lowest section of the vertical part of the T-shaped cylinder is a hexagonal nut (58);
six inner hexagon bolt holes (59) are uniformly formed in the lower end face of the lower cover (28) of the coal sample tank, six inner hexagon bolt holes (59) are connected with six inner hexagon bolt holes (45) in the lower end face of the cylinder body (25) of the coal sample tank in a matched mode through inner hexagon bolts (60), a central hole (61) is formed in the inner side of each inner hexagon bolt hole (59), the central hole (61) is equal in diameter to a T-shaped vertical cylinder of a piston (27), an O-shaped ring (62) is arranged on the side wall of each central hole (61), the O-shaped ring (62) forms extrusion sealing with the T-shaped vertical cylinder of the piston (27), a vertical hole (63) is formed in the left side of each central hole (61), the vertical hole (63) is communicated with a covering loading opening (64), and the covering loading opening (64) is connected with a covering loading device through a pipeline;
the coal sample tank support (29) upper end face be provided with centre bore (65), the vertical smooth cylindrical constant diameter of T shape of centre bore (65) and piston (27), coal sample tank lower cover (28) and the vertical cylinder of T shape of piston (27) are placed on coal sample tank support (29) through centre bore (65) of coal sample tank support, coal sample tank support (29) is placed in incubator (127).
In this embodiment, the isobaric water adding device comprises an advection pump, a water storage tank, a water adding piston container, a valve and a pipeline, wherein the water storage tank (66) is connected with the advection pump (67) through the pipeline, the advection pump (67) is connected with the valve (68) through the pipeline, the valve (68) is connected with the lower port of the four-way valve (69), the upper port of the four-way valve (69) is connected with the lower inlet (82) of the water adding piston container (70), the right port of the four-way valve (69) is connected with the valve (71) through the pipeline, the valve (71) is connected with the upper water adding port (30) through the pipeline, the left port of the four-way valve (69) is connected with the valve (72) through the pipeline, the lower port of the three-way valve (73) is connected with the lower water adding port (55) through the pipeline, the left port of the three-way valve (73) is connected with the valve (74), the lower port of the three-way valve (75) is connected with the right port of the three-way valve (75) through the pipeline, the lower port of the three-way valve (75) is connected with the upper port of the three-way valve (76) through the pipeline (77) and the upper port of the three-way valve (78) is connected with the three-way valve (78) through the valve (78), the right port of the tee joint (79) is connected with a valve (80), and the lower port of the tee joint (79) is connected with an upper inlet (81) of the water adding piston container (70);
Wherein the water adding piston container (70) comprises a cylinder body (83), a water adding piston container upper cover (84), a water adding piston container lower cover (85), a plug (86), a water adding piston (87), a hollow constant volume rod (88), a pull rod (89), a pull rod (94), a cap (90), a cap (91) and a flange (92), wherein the upper end of the cylinder body (83) is fixedly connected with the water adding piston container upper cover (84) through threads, a hole (97) is formed in the center of the upper end surface of the water adding piston container upper cover (84), two threaded holes (93) and (95) are formed in the outer side of the center hole, the hole (93) and the hole (95) are fixedly connected with the pull rod (94) and the pull rod (89) respectively, the pull rod (94) and the pull rod (89) are fixedly connected with the center of the water adding piston container upper cover (84) through nuts (98) and holes (99) in the flange (92), the lower end of the cylinder body (83) is fixedly connected with the water adding piston container lower cover (85) through threads, the water adding piston container lower cover (85) is provided with a matched water adding piston container (100) through the hole (100), the plug (86) forms extrusion seal with the inner wall of the cylinder (83) through the sealing ring (101), the upper end face of the plug (86) is concave, the upper end face of the plug (86) is provided with an orifice (102), the lower end face of the plug (86) is provided with an orifice (82), the orifice (82) is connected with the upper port of the four-way (69), the orifice (82) is communicated with the orifice (102), a hollow movable water adding piston (87) is arranged above the plug (86), the side wall of the water adding piston (87) is provided with the sealing ring (103) and the sealing ring (104), the sealing ring (103) and the sealing ring (104) form extrusion seal with the inner wall of the cylinder (83), the orifice (105) of the upper end face of the water adding piston (87) is fixedly connected with the lower part of the hollow constant volume rod (88), the hollow constant volume rod (88) below the upper end face of the upper cover (84) of the water adding piston container is a smooth surface, the hollow constant volume rod (88) above the upper end face of the upper cover (84) of the water adding piston container is a threaded surface, the cap (91) is positioned at the lower part of the flange (92) and forms matched hollow constant volume rod (88) through the threads, the upper orifice (81) of the hollow constant volume rod (88) is connected with the lower port of the tee joint (79) through a pipeline.
In this embodiment, isobaric desorption device include valve, back pressure valve, pipeline, pressure sensor, tee bend, hand pump and hand pump water storage tank group become, valve (106) one end is connected with the left port of tee bend (76) through the pipeline, the other end of valve (106) is connected with air inlet (108) of back pressure valve (107), gas outlet (109) of back pressure valve (107) are connected with desorption appearance (110) through the pipeline, water inlet (111) of back pressure valve (107) are connected with the left port of cross (112), the lower port of cross (112) is connected with sensor (113), the left port of cross (112) is connected with valve (114), valve (114) are connected with hand pump (115), hand pump (115) are connected with valve (116), valve (116) are connected with hand pump water storage tank (117).
In this embodiment, the resistance testing device includes a multi-channel resistance tester (118), a resistance testing wire (119) and a quick connector (120), the quick connector (120) is fixedly connected with the paint bubble wire (52) through a screw, the quick connector is connected with the multi-channel resistance tester (118) through the resistance testing wire (119), and the resistance tester (118) is connected with the control system (200) through a signal wire.
In this embodiment, the pressure-coating loading device comprises a pipeline, a tee joint, a pressure-coating loading sensor, a pressure-coating loading pump and an oil storage tank, wherein the left port of the tee joint (121) is connected with the pressure-coating loading port (64), the upper port of the tee joint (121) is connected with the pressure-coating loading sensor (122), the left port of the tee joint (121) is connected with a valve (123), the valve (123) is connected with the pressure-coating loading pump (124), the pressure-coating loading pump (124) is connected with a valve (125), and the valve (125) is connected with the oil storage tank (126).
In this embodiment, moulded coal suppression device include servo control mechanism (128), threaded post (129), top board (130), holding down plate (131), mesa (132), blank case (133), hydraulic jack (134), pressure head (135) and moulded coal mould (136) are constituteed, servo control mechanism (128) are connected with hydraulic jack (134) through oil pipe, hydraulic jack (134) and the central fixed connection of mesa (132), mesa (132) and blank case (133) fixed connection, mesa (132) and holding down plate (131) fixed connection, holding down plate (131) center is provided with recess (137), top board (130) are connected with threaded post (129) through the screw thread, threaded post (129) and ground (138) fixed connection, moulded coal mould (136) constitute by coal sample jar barrel (25) and coal sample jar upper cover (24).
In this embodiment, the control system is a circuit system based on any one or two of an industrial computer and a personal computer, and the control system is additionally provided with a network communication device.
The method for testing the moisture distribution system in the gas-containing coal imbibition process under the overburden condition as shown in fig. 6 comprises the following steps:
the test method for testing the water distribution system in the gas-containing coal imbibition process under the overburden condition is characterized by comprising the following steps of:
S1, equipment is assembled, namely an air regulating device, a coal sample tank device, an isobaric water adding device, an isobaric desorption device, a resistance testing device, a pressure-covering loading device, a molded coal pressing device, a control valve and a control system which are formed by the invention are connected, and meanwhile, the control system is respectively connected with an external driving circuit and a data transmission network system to complete the novel assembly networking for standby;
s2, crushing fresh coal samples retrieved from a working surface, screening the crushed fresh coal samples, screening the coal samples with the particle size of 0-0.25 mm, placing the screened coal samples with the particle size of 0-0.25 mm in a drying oven for drying, setting the temperature of the drying oven to 105 ℃, testing the quality of granular coal every 0.5 hour until the quality is not changed, and then placing the granular coal in a dryer for cooling and standby; weigh oneConstant mass (m) 1 ) Adding 20% distilled water into the dried coal sample, uniformly stirring, wherein the coal sample after uniform stirring is m 1 * (1+20%) fixing the coal sample tank body (25) and the coal sample tank upper cover (24) by means of inner hexagonal bolts (40), and then pouring to obtain the molded coal die (136);
s3, adding a part of the uniformly stirred wet coal sample into a molded coal mold (136), after the addition, inserting a pressure head (135) into the molded coal mold (136), tamping up and down, pre-compacting, retaining the pressure head (135) in the molded coal mold (136), and simultaneously weighing the mass (m 2) of the rest coal sample, wherein the mass of the added coal sample is m 1 *(1+20％)-m 2 ；
S4, the upper pressing plate (130) of the servo universal testing machine is lowered until the distance from the upper end surface of the pressure head (135) is 2mm, the lowering is stopped, the servo control mechanism (128) is started, the pressing load (sigma) and the pressure stabilizing time are set for 20min, a start testing button is clicked, the lower pressing plate (131) moves upwards under the action of the hydraulic jack (134), when the set pressure is reached, the pressure stabilizing stage is entered, when the pressure is lowered, the servo universal testing machine automatically supplements load, and when the pressure is raised, the servo universal testing machine automatically reduces load;
s5, after the pressure stabilizing time is finished, automatically releasing pressure by the servo universal testing machine, automatically separating the upper end surface of the pressure head (135) from the pressure plate (130), stopping the servo control mechanism (128) after the servo universal testing machine completely releases pressure, taking out the molded coal die (136) from the servo universal testing machine, taking out the pressure head (135) from the molded coal die (136), inserting a graduated scale into the molded coal die (136), and reading the graduated scale h of the graduated scale from the orifice of the molded coal die 1 Due to the height h of the molded coal mold 2 It is known that the height of the pressed coal sample is h 1 -h 2 The mass of the coal sample per millimeter is (1.2 x m) 1 -m 2 )/(h 1 -h 2 )/10；
S6, because the lower edge of the first connecting hole of the plug wire sealing assembly is at a height (h) from the bottom of the molded coal die hole 3 ) The distance h between the upper surface of the molded coal sample and the lower edge of the first connecting hole of the plug wire sealing assembly can be calculated 3 -(h 1 -h 2 )；
S7, adding a certain mass of coal sample [ (1.2 x m) into the molded coal die again 1 -m 2 )/(h 1 -h 2 )]*[h 3 - (h 1 -h 2 )]*10, repeating the steps S3 to S7;
s8, punching holes on a PEEK material pressing sheet (49), a tetrafluoro material sealing piece (50) and a PEEK material lower gasket (51), wherein the number of the holes can be determined according to the need, namely the number of paint bubble lines, wherein a threading sealing assembly (52) with 3 holes and 4 holes is used for describing, the PEEK material pressing sheet (49), the tetrafluoro material sealing piece (50) and the PEEK material lower gasket (51) which pass through the paint bubble lines are inserted into an electrode joint (47), then the upper gasket (48) is put into the electrode joint (47), a pressing cap (46) is screwed into another hole in the same layer of a coal sample tank body (25) and is tightly pressed, and meanwhile, 7 paint bubble lines are arranged in a cross-shaped mode by adopting long tweezers, wherein one line is positioned at the center position as a common input end, and the other 6 lines are output ends;
s9, sequentially pressing a coal sample from bottom to top, arranging resistance measuring points, putting the coal sample into a drying oven for drying after the coal sample is pressed, putting a piston (27) into a coal sample tank body (25) after the drying is cooled, fixing a coal sample tank lower cover (28) and the coal sample tank body (25) through an inner hexagonal bolt (60), pouring the connected coal sample tank on a coal sample tank bracket (29), respectively connecting an upper water adding port (30), a gas injection port (32), a desorption port (33) and a pressure-covering loading port (64) with a pipeline, and simultaneously connecting a paint bubble line (52) with a quick connector (120);
S10, a power switch of an incubator (127) is turned on, the temperature of the incubator is set to be T, a switch of a coating pressure loading pump (124) is turned on, coating pressure (sigma) is set, a valve (125) is turned on, the coating pressure loading pump (62) starts to suck emulsion, the valve (125) is turned off after the emulsion is sucked, a valve (61) is turned on, when the indication of a sensor (122) is equal to (sigma), the coating pressure loading pump stops working, and when the indication of a sensor (60) is smaller than (sigma), the coating pressure loading pump continues working, and the coating pressure is kept to be (sigma);
s11, closing the pipelineWith valves (2), (12), (6), (16), (20), (23), (71), (72), (73), (78), (80), (74), (77), (108), (123), (114), (125) and (116), the valves of the helium bottle (10) are opened, and then the pressure-reducing valve (11) is adjusted so that the outlet pressure of the pressure-reducing valve (11) is equal to P 1 Opening the valve (12), flushing a certain amount of gas into the buffer tank (13), and reading the indication (P) after the indication of the pressure sensor (15) is stable 1 ) Closing the valve (12), opening the valve (16), the valve (74) and the valve (77), filling the gas in the buffer tank (13) into the coal sample tank device, and reading the indication (P) after the indication of the pressure sensor (15) is stable 2 ) The volume (V) between the valve (12) and the valve (16) 1 ) Has been previously calibrated according to the formula P 1 V 1 /Z 1 ＝P 2 V 2 /Z 2 Can calculate V 2 ，Z 1 、Z 2 Respectively P 1 、P 2 Compression factor under pressure, V 2 -V 1 That is, the free volume between the valves (16), (6), (20), (71), (72), (108), (78), the valve (23) is opened, the gas in the pipeline is discharged, and the valves (16), (23), (74) and (77) are closed;
s12, opening a valve (20), a valve (74) and a valve (77), starting a vacuum pump (17) until the indication of a compound vacuum gauge (18) is less than 10Pa, closing the valve (20), closing the vacuum pump (17), opening the valve of a methane bottle (1), opening a valve (2), flushing a certain amount of gas into a buffer tank (3), and reading the indication (P) of a pressure sensor (5) 3 ) Closing the valve (2), opening the valve (6), inflating the coal sample tank device, and reading the indication (P) of the inflated pressure sensor (5) 4 ) Closing the valve (6), observing whether the pressure in the coal sample tank reaches the adsorption equilibrium pressure after a period of adsorption, if not, continuing to charge the coal sample tank device with air, and recording the indication (P) of the pressure sensor (5) n ) The adsorbed methane amount isWherein Z is 3 、Z n Respectively P 3 、P n The compression factor in the state of pressure,v is known, which is the volume between the valve (2) and the valve (3);
S13, calculating water adding mass m3 according to the mass of the coal sample and the water adding percentage, setting water adding amount m3 in an LED display panel of a horizontal flow pump (67), starting the horizontal flow pump (67), opening valves (73) and (80), indicating that the space in a hollow constant volume rod (88), a water adding piston (87) and a plug (86) is fully filled with water when water flows out from an outlet of the valve (80), closing the valve (80), pushing the water adding piston (87) to move upwards due to incompressibility of water, and screwing a cap (91) and a cap (90) to the lower end face and the upper end face of a flange (92) to fix the hollow constant volume rod (88) after the water adding piston (87) stops moving;
s14, opening a valve (116), rotating the hand pump (115) anticlockwise, starting the hand pump (115) to absorb water, closing the valve (116) after the water absorption is finished, opening the valve (114), rotating the hand pump (115) clockwise, enabling water to enter the back pressure valve (107), and when the indication of the sensor (113) is equal to the adsorption equilibrium pressure P n When the hand pump (115) stops rotating, the valve (114) is closed;
s15, adding water to the coal sample tank system in an upper water adding mode and a lower water adding mode:
firstly, when upper water adding is adopted, gas is desorbed from the lower side of a coal sample tank device, a valve (77) is closed, a valve (78) is opened, due to the incompressibility of water, the coal sample tank and a water adding piston container are integrated, the system pressure is still adsorption balance pressure, a multi-channel resistance tester (118) is opened, a valve (71) is opened, water in the water adding piston container enters a coal sample tank system through an upper water adding port (30) under the action of self gravity, the water is imbibited in the coal body after isobaric water adding, the pressure in the coal sample tank device rises, when the pressure in the coal sample tank device is larger than the pressure of a sensor (115), a back pressure valve is opened, the gas enters a desorption instrument (110) through a lower water adding port (55), a valve (74), a tee joint (75), a tee joint (76), a valve (106) and a back pressure valve (107), the multi-channel resistance tester (118) can also measure the resistance between each layer 6 output ends and a public input end in the upper-lower imbibition process, and ρ = L is calculated through the resistance, wherein the sectional area is represented by a formula, and the resistance L is represented by the formula, and the length is represented by the formula;
Secondly, when lower water adding is adopted, gas is desorbed from the upper side of the coal sample tank device, a valve (74) is closed, a valve (78) is opened, the coal sample tank and a water adding piston container are integrated due to incompressibility of water, the system pressure is still adsorption balance pressure, a multi-channel resistance tester (118) is opened, a valve (72) is opened, water in the water adding piston container enters a coal sample tank system through a lower water adding port (55) under the action of self gravity, the water is subjected to imbibition effect in coal after isobaric water adding, the pressure in the coal sample tank device is increased, when the pressure in the coal sample tank device is larger than the pressure of a sensor (115), a back pressure valve is opened, the gas enters a desorption instrument (110) through a desorption port (33), a valve (77), a tee joint (76), a valve (106) and a back pressure valve (107), and meanwhile, the resistance between each layer 6 output ends and a public input end in the process of the lower imbibition from bottom to the upper side can be measured through a resistivity calculation formula ρ=L, wherein ρ is the resistance, R is the resistance, S is the resistance and the sectional area is L and the length is the length;
s16, after obtaining the resistivity of the gas-containing coal in the imbibition process under the overburden condition, inverting to obtain the water distribution of the gas-containing coal in the imbibition process under the overburden condition through the corresponding relation between the existing water content and the resistivity.
Compared with the prior art, the invention has the following beneficial effects: the invention has low risk, convenient and accurate testing method and high similarity with the actual occurrence of the coal seam, can realize dynamic monitoring, and lays a theoretical foundation for further researching the hydrodynamics measure outburst prevention mechanism.
It will be appreciated by those skilled in the art that the invention is not limited to the embodiments described above. The foregoing embodiments and description have been presented only to illustrate the principles of the invention. The present invention is capable of various changes and modifications without departing from its spirit and scope. Such variations and modifications are intended to fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (2)
1. The water distribution system in the gas-containing coal imbibition process under the condition of testing overlying strata is characterized in that: the moisture distribution system comprises an air-conditioning device, a coal sample tank device, an isobaric water adding device, an isobaric desorption device, a resistance testing device, an isobaric water adding device, a molded coal pressing device, a control valve and a control system in the gas-containing coal imbibition process under the test overburden condition, wherein the coal sample tank device and the isobaric water adding device are mutually connected in series through a flow guide pipe, the coal sample tank device is respectively communicated with the air-conditioning device and the isobaric desorption device through the flow guide pipe, the coal sample tank device is mutually communicated with the isobaric water adding device, the coal sample tank device is electrically connected with the resistance testing device through a wire, a plurality of control valves are uniformly distributed on the flow guide pipe and are respectively communicated with the air-conditioning device, the coal sample tank device, the isobaric water adding device, the isobaric desorption device, the resistance testing device, the molded coal pressing device and the control valve through wires;
The air regulating device comprises a methane inflating mechanism, a helium calibrating mechanism and a vacuum degassing mechanism;
the methane charging mechanism comprises a high-pressure methane bottle, a valve, a buffer tank, a tee joint, a pressure sensor, a pipeline and a signal line, wherein the high-pressure methane bottle (1) is connected with the first valve (2) through the pipeline, the first valve (2) is connected with the first buffer tank (3) through the pipeline, the first buffer tank (3) is connected with the right port of the first tee joint (4) through the pipeline, the lower port of the first tee joint (4) is connected with the first pressure sensor (5), the first pressure sensor (5) is connected with the control system (200) through the signal line, the left port of the first tee joint (4) is connected with the second valve (6) through the pipeline, and the second valve (6) is connected with the right port of the first four-way joint (9) through the pipeline;
the helium calibration mechanism comprises a helium bottle, a pressure reducing valve, a buffer tank, a tee joint, a pressure sensor, a pipeline and a signal line, wherein the helium bottle (10) is connected with the pressure reducing valve (11) through the pipeline, the pressure reducing valve (11) is connected with the third valve (12) through the pipeline, the third valve (12) is connected with the second buffer tank (13) through the pipeline, the second buffer tank (13) is connected with the right port of the second tee joint (14) through the pipeline, the upper port of the second tee joint (14) is connected with the second pressure sensor (15), the second pressure sensor (15) is connected with the control system (200) through the signal line, the left port of the second tee joint (14) is connected with the fourth valve (16) through the pipeline, and the fourth valve (16) is connected with the upper port of the first tee joint (9) through the pipeline;
The vacuum degassing mechanism comprises a vacuum pump, a compound vacuum gauge and a valve, wherein the vacuum pump (17) is connected with the lower port of a third tee joint (19) through a pipeline, the left port of the third tee joint (19) is connected with the compound vacuum gauge (18) through a vacuum silicon pipe, the upper port of the third tee joint (19) is connected with a fifth valve (20) through a pipeline, the fifth valve (20) is connected with the lower port of a first four-way (9) through a pipeline, the methane charging mechanism, the helium calibration mechanism and the vacuum degassing mechanism are connected with the first four-way (9) together, the left port of the first four-way (9) is connected with the right port of a second four-way (21) through a pipeline, the lower port of the second four-way (21) is connected with a third pressure sensor (22), the third pressure sensor (22) is connected with a control system (200) through a signal wire, the upper port of the second four-way (21) is connected with a sixth valve (23), and the left port of the second four-way (21) is connected with a coal sample tank device through a pipeline;
the coal sample tank device comprises a coal sample tank upper cover (24), a coal sample tank cylinder (25), a threading sealing assembly (26), a piston (27), a coal sample tank lower cover (28) and a coal sample tank bracket (29);
the center of the upper cover (24) of the coal sample tank is provided with an upper water adding port (30), the upper part of the upper water adding port (30) is connected with an isobaric water adding device through a pipeline, the lower part of the upper water adding port (30) is communicated with a first vertical hole (31), the right side of the upper cover (24) of the coal sample tank is provided with an air injection port (32), the air injection port (32) is connected with the left end opening of a second four-way (21) through a pipeline, the tail end of the air injection port (32) is communicated with a second vertical hole (34), the left side of the upper cover (24) of the coal sample tank is provided with a desorption port (33), the tail end of the desorption port (33) is communicated with a third vertical hole (35) through a pipeline, the desorption port (33) is connected with an isobaric desorption device and the isobaric water adding device, the first vertical hole (31), the second vertical hole (34) and the third vertical hole (35) are respectively communicated with a first metal net (36) with a certain thickness, the periphery of the first metal net (36) is connected with the lower end face of the upper cover (24) of the coal sample tank through a pipeline, the first outer edge of the first metal net (36) is provided with a hexagonal ring (37), and the first circumference of the first circumference (37) is uniformly distributed along the six circumferences of the first circumference (37);
The upper end face of the coal sample tank body (25) is uniformly provided with second six inner hexagonal bolt holes (39) along the circumference, the second six inner hexagonal bolt holes (39) of the coal sample tank body (25) are in matched connection with the first six inner hexagonal bolt holes (38) of the upper cover of the coal sample tank through first inner hexagonal bolts (40), the inner side of the second six inner hexagonal bolt holes (39) of the upper end face of the coal sample tank body (25) is provided with ribs with the height of 3mm, the ribs with the height of 3mm and the first O-shaped rings (37) form extrusion sealing, the side wall of the coal sample tank body (25) is provided with four layers of two-row threading sealing assembly (26) connecting holes, the included angle between the two connecting holes of each layer of threading sealing assembly (26) is 90 DEG, the threading sealing assembly (26) is in matched connection with the side wall holes of the coal sample tank body (25) through threads (41), smooth surfaces (42), second O-shaped rings (43) and third O-shaped rings (44), the lower end face of the coal sample tank body (25) is uniformly provided with three inner side wall holes (45 mm along the circumference of the six inner hexagonal bolts of the inner side face of the coal sample tank body (25);
the threading sealing assembly (26) consists of a pressing cap (46), an electrode joint (47), an upper gasket (48), a PEEK material pressing sheet (49), a tetrafluoro material sealing piece (50), a PEEK material lower gasket (51), a second O-shaped ring (43), a third O-shaped ring (44) and an enameled wire (52), wherein the electrode joint (47) is hollow, threads (41) are arranged on the outer side of the middle part of the electrode joint (47), a smooth surface (42) is arranged on the outer side of the lower part, the second O-shaped ring (43) and the third O-shaped ring (44) are arranged in the smooth surface (42), the inner side of the electrode joint (47) is connected with the pressing cap (46) through threads, a hollow upper gasket (48) is arranged on the left side of the pressing cap (46), a PEEK material pressing sheet (49) is arranged on the left side of the hollow upper gasket (48), a tetrafluoro material sealing piece (50) is arranged on the left side of the PEEK material pressing sheet (49), a material lower gasket (51) is arranged on the left side of the tetrafluoro material sealing piece (50), the PEEK material (49), the PEEK material (50) and the PEEK material pressing sheet (50) are straight-line material and the PEEK material pressing sheet (50) are arranged on the central axis of the upper gasket (51) and the material pressing sheet, the number of the enamelled wires is determined according to the requirement, when the holes are drilled, the enamelled wires (52) are guaranteed to be on the same horizontal straight line, and the enamelled wires are connected with a PEEK material pressing piece (49), a tetrafluoro material sealing piece (50) and a PEEK material lower gasket (51) through the holes, wherein one enamelled wire is a common input end, and the other enamelled wires are output ends;
The piston (27) is in a hollow T shape, the upper end face of the T-shaped transverse part is provided with a second metal net (53) with a certain thickness, the periphery of the second metal net (53) is connected with the upper end face of the T-shaped transverse part through welding, the second metal net (53) is communicated with the lower water adding port (55) through a fourth vertical hole (54), the T-shaped transverse part is contacted with the inner wall of the coal sample tank cylinder body (25) through a fourth O-shaped ring (56) and a fifth O-shaped ring (57), one section of the vertical part of the T-shaped cylinder is in a smooth plane, and the lowest section of the vertical part of the T-shaped cylinder is a hexagonal nut (58);
the lower end face of the lower cover (28) of the coal sample tank is uniformly provided with a fourth six inner hexagon bolt hole (59), the fourth six inner hexagon bolt hole (59) is in matched connection with a third six inner hexagon bolt hole (45) of the lower end face of the cylinder (25) of the coal sample tank through a second inner hexagon bolt (60), a first central hole (61) is formed in the inner side of the fourth six inner hexagon bolt hole (59), the first central hole (61) is in equal diameter with a T-shaped vertical cylinder of the piston (27), a sixth O-shaped ring (62) is arranged on the side wall of the first central hole (61), the sixth O-shaped ring (62) forms extrusion sealing with the T-shaped vertical cylinder of the piston (27), a fifth vertical hole (63) is formed in the left side of the first central hole (61), the fifth vertical hole (63) is communicated with a covering pressure loading port (64), and the covering pressure loading port (64) is connected with a covering pressure loading device through a pipeline;
The upper end face of the coal sample tank support (29) is provided with a second central hole (65), the second central hole (65) is of the same diameter as a T-shaped vertical smooth cylinder of the piston (27), the coal sample tank lower cover (28) and the T-shaped vertical cylinder of the piston (27) are placed on the coal sample tank support (29) through the second central hole (65) of the coal sample tank support, and the coal sample tank support (29) is placed in the incubator (127);
the isobaric water adding device comprises a advection pump, a water storage tank, a water adding piston container, a valve and a pipeline, wherein the water storage tank (66) is connected with the advection pump (67) through the pipeline, the advection pump (67) is connected with a seventh valve (68) through the pipeline, the seventh valve (68) is connected with a lower port of a third four-way valve (69), an upper port of the third four-way valve (69) is connected with a lower inlet (82) of the water adding piston container (70), a right port of the third four-way valve (69) is connected with an eighth valve (71) through the pipeline, the eighth valve (71) is connected with an upper water adding port (30) through the pipeline, a left port of the third four-way valve (69) is connected with a ninth valve (72) through the pipeline, a lower port of the fourth three-way valve (73) is connected with a lower port of the lower water adding port (55) through the pipeline, a left port of the fourth three-way valve (73) is connected with a tenth valve (74), a right port of the tenth valve (74) is connected with a right port of the fifth three-way valve (75) through the pipeline, a left port of the fifth valve (75) is connected with an upper port of the third three-way valve (75) through the pipeline, a fifth port of the third valve (76) is connected with an upper port of the third valve (75) through the pipeline, and the upper port of the third valve (75) is connected with the upper port of the third valve (75), the twelfth valve (78) is connected with the left port of the seventh tee joint (79), the right port of the seventh tee joint (79) is connected with the thirteenth valve (80), and the lower port of the seventh tee joint (79) is connected with the upper inlet (81) of the water adding piston container (70);
Wherein the water adding piston container (70) comprises a cylinder body (83), an upper water adding piston container cover (84), a lower water adding piston container cover (85), a plug (86), a water adding piston (87), a hollow constant volume rod (88), a first pull rod (89), a second pull rod (94), a first cap (90), a second cap (91) and a flange (92), wherein the upper end of the cylinder body (83) is fixedly connected with the upper water adding piston container cover (84) through threads, a third central hole (97) is formed in the center of the upper end surface of the upper water adding piston container cover (84), two threaded holes I (93) and II (95) are formed outside the third central hole (97), the holes I (93) and II (95) are respectively fixedly connected with the second pull rod (94) and the first pull rod (89) in a central symmetry mode relative to the upper water adding piston container cover (84), the first pull rod (89) is fixedly connected with a third hole (99) in the flange (92) through a nut (98), the lower water adding piston container cover (85) is fixedly connected with the lower water adding piston container cover (85) through threads, the plug (86) is connected with the lower cover (85) of the water adding piston container in a matching way through the fourth central hole (100), the plug (86) forms extrusion sealing with the inner wall of the cylinder body (83) through the first sealing ring (101), the upper end face of the plug (86) is concave, the upper end face of the plug (86) is provided with a first orifice (102), the lower end face of the plug (86) is provided with a lower inlet (82), the lower inlet (82) is connected with the upper port of the third four-way (69), the lower inlet (82) is communicated with the first orifice (102), a hollow movable water adding piston (87) is arranged above the plug (86), the side wall of the water adding piston (87) is provided with a second sealing ring (103) and a third sealing ring (104), the second sealing ring (103) and the third sealing ring (104) form extrusion sealing with the inner wall of the cylinder body (83), the upper end face orifice II (105) of the water adding piston (87) is fixedly connected with the lower part of the hollow constant volume rod (88), the hollow constant volume rod (88) below the upper end face of the upper cover (84) of the water adding piston container is a smooth surface, the hollow constant volume rod (88) above the upper end face of the upper cover (84) of the water adding piston container is a thread surface, the second combining cap (91) is positioned at the lower part of the flange (92), the second combining cap is in matched connection with the hollow constant volume rod (88) through threads, the first combining cap (90) is positioned at the upper part of the flange (92), the hollow constant volume rod (88) is connected with the upper inlet (81) of the upper part of the hollow constant volume rod (88) in a matching way through threads, and the upper inlet is connected with the lower port of the seventh tee joint (79) through a pipeline;
The isobaric desorption device comprises a valve, a back pressure valve, a pipeline, a pressure sensor, a tee joint, a hand pump and a hand pump water storage tank, one end of a fourteenth valve (106) is connected with the left port of a sixth tee joint (76) through the pipeline, the other end of the fourteenth valve (106) is connected with an air inlet (108) of the back pressure valve (107), an air outlet (109) of the back pressure valve (107) is connected with a desorption instrument (110) through the pipeline, a water inlet (111) of the back pressure valve (107) is connected with the right port of a fourth four-way joint (112), the lower port of the fourth four-way joint (112) is connected with a fourth pressure sensor (113), the left port of the fourth four-way joint (112) is connected with a fifteenth valve (114), the fifteenth valve (114) is connected with a hand pump (115), the hand pump (115) is connected with a sixteenth valve (116), and the sixteenth valve (116) is connected with a hand pump water storage tank (117).
The resistance testing device comprises a multi-channel resistance tester (118), a resistance testing wire (119) and a quick connector (120), wherein the quick connector (120) is fixedly connected with the enameled wire (52) through a screw, the quick connector is connected with the multi-channel resistance tester (118) through the resistance testing wire (119), and the resistance tester (118) is connected with the control system (200) through a signal wire;
The pressure-coating loading device comprises a pipeline, a tee joint, a pressure-coating loading sensor, a pressure-coating loading pump and an oil storage tank, wherein the right port of an eighth tee joint (121) is connected with the pressure-coating loading port (64), the upper port of the eighth tee joint (121) is connected with the pressure-coating loading sensor (122), the left port of the eighth tee joint (121) is connected with a seventeenth valve (123), the seventeenth valve (123) is connected with the pressure-coating loading pump (124), the pressure-coating loading pump (124) is connected with an eighteenth valve (125), and the eighteenth valve (125) is connected with the oil storage tank (126);
the molded coal pressing device comprises a servo control mechanism (128), a column (129) with threads, an upper pressing plate (130), a lower pressing plate (131), a table top (132), a hollow shell box body (133), a hydraulic jack (134), a pressure head (135) and a molded coal die (136), wherein the servo control mechanism (128) is connected with the hydraulic jack (134) through an oil pipe, the hydraulic jack (134) is fixedly connected with the center of the table top (132), the table top (132) is fixedly connected with the hollow shell box body (133), the table top (132) is fixedly connected with the lower pressing plate (131), a groove (137) is formed in the center of the lower pressing plate (131), the upper pressing plate (130) is connected with the column (129) with threads through threads, and the column (129) with threads is fixedly connected with the ground (138), and the molded coal die (136) is composed of a coal sample tank body (25) and a coal sample tank upper cover (24).
2. The system for distributing moisture in a gas-containing coal imbibition process under the condition of testing overburden according to claim 1, wherein the system comprises the following components: the control system is a circuit system based on the sharing of any one or two of an industrial computer and a personal computer, and is additionally provided with a network communication device.
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