CN106525526A - Determination method of high-pressure water injection and radial gas permeability of gas-containing raw coal - Google Patents
Determination method of high-pressure water injection and radial gas permeability of gas-containing raw coal Download PDFInfo
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- CN106525526A CN106525526A CN201610949294.1A CN201610949294A CN106525526A CN 106525526 A CN106525526 A CN 106525526A CN 201610949294 A CN201610949294 A CN 201610949294A CN 106525526 A CN106525526 A CN 106525526A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
Abstract
The invention discloses a determination method of high-pressure water injection and radial gas permeability of gas-containing raw coal and belongs to the technical field of coal mine disaster prevention. According to the method, a water injection hole is drilled in the top center of a selected and cut cylindrical sample, a water injection floral tube is mounted in the water injection hole, two ends of the water injection floral tube are sealed, the sample is placed in an annular gas permeating cylinder, cement is poured on a base of the annular gas permeating cylinder, a gas permeable tube is arranged between the inner wall of the annular gas permeating cylinder and the cylindrical sample, cement is poured into the gap formed between the cylinder wall and the cylindrical sample, a platen is arranged at the top of the cylindrical sample, after the cement in the annular gas permeating cylinder is set, a support rod is taken out, and a raw coal sample is obtained; then the raw coal sample is placed in an experiment tank, and the permeability of the high-pressure water invasion gas-containing raw coal sample is finally calculated through cooperation of a pressure loading system, a high-pressure water injection system and the like which are connected with the experiment tank. The method provides scientific instruction for prevention of coal mine disasters with the coal seam water injection technology.
Description
Technical field
The invention belongs to prevention and control of mine disaster technical field, and in particular to a kind of high pressure water injection and the experiment of radial direction gas porous flow
Method, more particularly to the assay method of a kind of high pressure water injection of raw coal containing gas and radial direction gas permeation rate.
Background technology
In recent years, with the increase of coal mining depth, in recovery process, the disaster such as gas, fire, dust and water is increasingly
Seriously, take precautions against natural calamities effect to improve colliery, China generally using coal-bed flooding technology carry out colliery synthesis disaster (gas, dust,
Bump) improvement.At present, the difficulty by field experimentation development coal-bed flooding fundamental research is larger, needs experiment
Room experiment simulating coal-bed flooding dynamic process under truth, because raw coal sample preparation is complicated and not easy-formation, and type
Coal has the advantages that shape-plastic is high, granule is uniform, property homogenizing and be widely adopted, therefore coal sample used by experiment mostly is at present
Moulded coal sample, even if the Mono direct percolation experiment of gas or water mostly also is using raw coal sample, simulates true coal using raw coal sample
The Radial Flow Through Porous Media experiment of layer water filling dynamic process is rarely reported.
It is well known that coal is Anisotropic Porous Media, internal development has the network seepages such as primary joint, mining induced fissure to tie
Structure, and moulded coal sample does not possess the function of simulating this structure, while moulded coal sample also cannot truly reflect raw coal mechanical characteristic,
The application that expected experimental result carrys out guide field technology cannot be obtained.
The content of the invention
A kind of making of raw coal sample is to provide for one of defect present in above-mentioned prior art, task of the present invention
Method, during it overcomes prior art, raw coal makes the not defect such as easy-formation, the raw coal sample that the present invention is provided, after can meeting
Continuous water filling and the carrying out of radial direction gas porous flow experiment, provide scientific guidance for coal-bed flooding technology prevention Coal Mine Disasters.
Its technical solution includes：
A kind of manufacture method of raw coal sample, is comprised the following steps successively：
A chooses the cube coal sample of certain size as experiment coal sample along coal-face, by the experiment coal sample cutting
Into the column sample of certain size, and its surface is polished, note is drilled through from top to bottom in the column sample center
Water hole, installs water filling floral tube in the water injection hole, by two end seals of the water filling floral tube；
B is placed on the column sample for being installed on water filling floral tube in ring-type permeation cylinder, pours in the base of ring-type permeation cylinder
Cement is built, permeability cell is installed between its inwall and column sample, the permeability cell is by penetrating ring-type permeation cylinder casing wall
Support bar is fixed, joints cement in the space formed with the column sample to the ring-type permeation cylinder casing wall, until covering
Till sample top surface certain thickness, platen is installed at the top of the column sample；
The support bar after theing cement solidifies in ring-type permeation cylinder is taken out, obtains final product raw coal sample by c.
Used as a preferred version of the present invention, the size of the column sample is 300 × h50mm of Φ, the water filling
Bore dia is 10mm.
Another task of the present invention is to provide the measure side of a kind of high pressure water injection of raw coal containing gas and radial direction gas permeation rate
Method, wherein raw coal sample are raw coal sample obtained by above-mentioned preparation, by the high pressure water injection of raw coal containing gas and radial direction gas porous flow
Experiment, can disclose the power Water Invasion Characteristics of raw coal containing gas and coal-water-strength mechanism of action；And by cutting into slices to raw coal test specimen
Observe and combine the analysis of non-linear fractals, can improve raw coal containing gas under power water enchroachment (invasion) it is grand-microscopical structure in water infiltration
Property with fractal structure relation, and obtain affecting laws of the outside macroparameter (covering pressure, gas pressure) to permeability fractal model.
A kind of high pressure water injection of raw coal containing gas and the assay method of radial direction gas permeation rate, comprise the following steps：
Step one, preparing experiment system, the experimental system include testing tank body, cover pressure loading system, high pressure water injection system
System, evacuation-gas injection system, data monitoring system and data collecting system, the experiment tank body includes tank body, in the tank
The surrounding of body is provided with air inlet, water inlet, gas outlet and pressure transmitter interface, is originally provided with ring-type in vivo in the tank
Permeation cylinder, the ring-type permeation cylinder are closely embedded in tank inner body wall, and communicate with the air inlet, in the ring-type permeation cylinder
The raw coal sample prepared such as claim 1 or 2 is placed, and platen is placed above the raw coal sample, above the platen
T-shaped piston is installed, the sealing cover body for sealing to the tank body above the T-shaped piston, is installed；It is described to cover pressure loading system
System is connected with the sealing cover body, and the high pressure water injection system is connected with the water inlet by pipeline, the evacuation-gas injection
System is connected with the air inlet by pipeline, and the pressure transmitter interface is connected to the data monitoring system；The number
Include gas collecting apparatus according to acquisition system, the gas collecting apparatus is connected with the air inlet by pipeline；
Step 2, Ar, and turn-on data monitoring system are originally injected in vivo to the tank by evacuation-gas injection system, examined
The air-tightness of experimental system is surveyed, evacuation-gas injection system is closed after air-tightness is good；
Pressure loading system is covered in step 3, startup, the raw coal sample in ring-type permeation cylinder is carried out covering pressure loading, by area
Pressure is covered than calculating raw coal sample and carrying, correspondingly coal seam is original covers pressure；
Step 4, startup evacuation-gas injection system, first carry out evacuation to tank body, then reinject methane, and keep
Pressure constant state, after raw coal sample equilibrium adsorption 8h, closes evacuation-gas injection system；
Step 5, high pressure water injection system is opened to the internal water filling of tank sheet, after coal seam with gas high pressure water enchroachment (invasion) experiment to be done,
High pressure water injection system is closed, and is now opened evacuation-gas injection system and methane is originally injected in vivo to tank, and keeps pressure constant state,
In the raw coal sample, gas and water competitive Adsorption, balance 8h；
Step 6, turn-on data acquisition system, raw coal sample Radial Flow Through Porous Media described in methane Jing to water filling floral tube, seepage flow initial stage
For gas and water coexisting state, treat as full gaseity, and after gas flow is stable, read test result calculates high pressure according to formula (1)
The permeability of water enchroachment (invasion) raw coal containing gas sample：
In formula：Permeabilities of the K for coal sample, mD, μ are gas viscosity, p0For the atmospheric pressure of laboratory, Pa；Q0For gas stream
Amount, ml/s；pw、peRespectively inner and outer boundary pressure, MPa；rw、reRespectively inner and outer boundary radius, cm；H be raw coal thickness, cm.
Preferably, the pressure loading system of covering includes electro-hydraulic servo control oil pressure pump, by electro-hydraulic servo control oil
Press pump applies pressure to T-shaped piston, so as to the pressure of covering completed to raw coal sample is loaded.
Preferably, mass flowmenter, the data monitoring system are additionally provided with the pipeline being connected with the gas collecting apparatus
Including computer and data acquisition unit, the data acquisition unit passes through pressure transmitter interface and mass flow described in connection
Meter.
Preferably, the evacuation-gas injection system includes vacuum pump, air relief valve, methane steel cylinder and Ar steel cylinders, the methane
Steel cylinder and Ar steel cylinders are connected on the gas injection port by pipeline, and the vacuum pump and air relief valve are installed in methane steel cylinder and gas injection
On pipeline between mouthful.
The Advantageous Effects brought by the present invention：
First, the raw coal sample for preparing of the present invention overcome moulded coal sample commonly used in the prior art cannot mould completely
Intend raw coal mechanical characteristic, the defect of pore structure, in the manufacture method of raw coal sample, instant invention overcomes its not easy-formation etc.
Technological deficiency, is prepared by the method for the present invention the raw coal sample for obtaining, and which more meets following injected water and the experiment of radial direction gas porous flow
Carrying out, the raw coal sample for preparing of the present invention can truly reflect raw coal mechanical characteristic；
Secondly, in the assay method of the high pressure water injection of raw coal containing gas and radial direction gas permeation rate, employ above-mentioned preparation
The raw coal sample for obtaining, the assay method can disclose the power Water Invasion Characteristics of raw coal containing gas and coal-water-strength mechanism of action；
And by observing to the section of raw coal test specimen and analyzing with reference to non-linear fractals, raw coal containing gas under power water enchroachment (invasion) can be improved
The permeability of water and fractal structure relation in grand-microscopical structure, and outside macroparameter (covering pressure, gas pressure) is obtained to infiltration
The affecting laws of rate fractal model；Meanwhile, based on principle of effective stress, Binding experiment analysis can be under construction force water enchroachment (invasion)
Raw coal gas microcosmic adsorption swelling and macroscopical seepage flow Coupling Dynamic Model, are that coal-bed flooding preventing and treating coal and gas prominent accident is carried
For scientific basis and theoretical direction；
Finally, in the determination experiment system of the high pressure water injection of raw coal containing gas and radial direction gas permeation rate, by experimental tank
Body, cover pressure loading system, high pressure water injection system, evacuation-gas injection system, data monitoring system and data collecting system it is mutual
Coordinate, be capable of achieving Automated condtrol, it is convenient to operate.
Description of the drawings
The present invention will be further described below in conjunction with the accompanying drawings：
Fig. 1 is the determination experiment system schematic of the high pressure water injection of raw coal containing gas of the invention and radial direction gas permeation rate；
Fig. 2 is the A-A generalized sections of experiment tank body in Fig. 1；
Fig. 3 is raw coal sample preparation schematic diagram of the present invention；
Wherein, 1- electro-hydraulic servo control oil pressure pump, 2- experiment tank bodies, 3- mass flowmenters, 4- high pressure water-injection pumps, 5- gas collections
Device, 6- ponds, 7- computers, 8- data acquisition units, 9- vacuum pumps, 10- air relief valve, 11- methane steel cylinders, 12- nuts, 13- connect
Acting flange, 14-T type pistons, 15-O type sealing rings, 16- air inlets, 17- pressure transmitters, 18- tank bodies, 19- platens, 20-
Water filling floral tube, 21- ring-type permeation cylinders, 22- water inlets/gas outlet, 23- column samples, 24- silica gel, 25- cement, 26- are breathed freely
Pipe, 27- cement, 28- raw coal samples, 29- support bars, 30- air inlet pipe.
Specific embodiment
The present invention is elaborated with reference to specific embodiment.
As shown in figure 3, the manufacture method of raw coal sample of the present invention, specifically includes following steps：
A, scene select layer to clear the preferable region of clear, integrity and carry out channeling sampling along coal-face, and size is 400
The cube of × 400 × 400mm, sealing send laboratory, choose 4 class of high and low hardness and high and low porosity of China Typical Mining
Coal sample is used as experiment coal sample；
B, cutting machine are prepared into the column sample 23 of 300 × h50mm of Φ, and the face of cylinder is along layer reason and vertical stratification direction point
Two class samples are made, its surface is polished, cylindrical center drills through Φ 10mm water injection holes, install water filling floral tube 20, water filling flower
20 two ends of pipe are sealed by silica gel 24 with column sample 23, and 20 lower end of water filling floral tube is connected to tank sheet using O-ring seal 15
The chassis of body 18, and be connected and sealed；
C, column sample 23 is installed in ring-type permeation cylinder 21, in 21 base joints cement 25 of ring-type permeation cylinder,
Permeability cell 26 is installed between 21 casing wall of ring-type permeation cylinder and sample, permeability cell 26 is by penetrating propping up for ring-type permeation cylinder casing wall aperture
Strut 29 is fixed, the space joints cement 27 between ring-type permeation cylinder casing wall and sample, until covering column sample top surface
Certain thickness, subsequently installs platen 19 at the top of the column sample, and close with ring-type permeation cylinder 21 by O-ring seal 15
Envelope；
D, the cement solidifies 48 hours after, the support bar 29 in 21 casing wall aperture of ring-type permeation cylinder taken out, as molding
Raw coal sample 28, carries out subsequent experimental again after being vacuum dried.
During the above-mentioned raw coal sample for preparing is used for the high pressure water injection of raw coal containing gas and the experiment of radial direction gas porous flow, tool
The experimental system adopted by the experiment of body, with reference to shown in Fig. 1 and Fig. 2, including experiment tank body 2, covers pressure loading system, high pressure injection
Water system, evacuation-gas injection system, data monitoring system and data collecting system；Specifically, testing tank body 2 includes tank body
18, the surrounding of tank body 18 is provided with air inlet 16, water inlet 22,17 interface of gas outlet 22 and pressure transmitter, air inlet
Connecting air inlet pipe 30 at 16, ring-type permeation cylinder 21 being provided with tank body 18, ring-type permeation cylinder 21 is closely embedded in tank body
18 inwalls, and communicate with air inlet 16, the raw coal sample 28 for preparing is placed in ring-type permeation cylinder, above raw coal sample
Platen 19 is placed, T-shaped piston 14 is installed above platen, the sealing cover body for sealing to tank body above T-shaped piston 14, is installed,
Such as adpting flange 13, tank body is sealed by 13 attaching nut 12 of adpting flange, the water filling floral tube in raw coal sample 28
20 are connected with water inlet/gas outlet 22 by internal duct.
Pressure loading system, including electro-hydraulic servo control oil pressure pump 1 are covered, which is used for tank sheet, and T-shaped piston 14 applies pressure in vivo
Power, specific loading method is：Start electro-hydraulic servo oil pressure pump 1, to injection hydraulic pressure in space between T-shaped piston 14 and closure
Oil, carries out covering pressure loading to raw coal sample 28.
High pressure water injection system includes high pressure water-injection pump 4, pond 6, mainly meets high pressure water injection requirement of experiment, and specifically it leads to
Piping is connected with water inlet 22, originally provides high-pressure water in vivo to tank.
Evacuation-gas injection system includes vacuum pump 9, air relief valve 10, methane steel cylinder 11 and Ar steel cylinders, methane steel cylinder 11 and Ar
Steel cylinder is connected with air inlet, when needing to be passed through methane, cuts off the connection between Ar steel cylinders and air inlet, when needing to be passed through Ar
When, the connection between methane steel cylinder and air inlet is cut off, vacuum pump 9 is connected with experiment tank body 2 by respective line, and is passed through
Air relief valve 10 is connected with methane steel cylinder 11.
Data monitoring system includes computer 7 and data acquisition unit 8, data acquisition unit 8 respectively with mass flowmenter 3, pressure
Transmitter 17 is connected, while being connected with a data processing centre.The system realizes the related ginseng such as experimental pressure and flow
Several real-time monitorings and collection, high degree of automation, data acquisition are accurate.
Data collecting system includes gas collecting apparatus 5 and mass flowmenter 3, and gas collecting apparatus is connected with air inlet by pipeline,
Air inflow is monitored by mass flowmenter 3, and is sent to the data acquisition unit 8 being connected with it.
For the ease of control, can on the pipeline in evacuation-gas injection system, high pressure water injection system, data monitoring system
Valve is set.
It is above-mentioned for the high pressure water injection of raw coal containing gas and radial direction gas porous flow experimental technique in, raw coal sample can be oozed
Rate is measured thoroughly, and specific assay method is：
Step one, according to above-mentioned experimental system structure, raw coal sample 28 is installed in tank body, and installs T-shaped piston
14, and connect sealing cover body；Ar steel cylinders are opened, and Ar are originally injected in vivo to tank, using voltage stabilizing method checking test air-tightness；
Step 2, startup electro-hydraulic servo oil pressure pump 1, it is to injection hydraulic oil in space between T-shaped piston 14 and sealing cover body, right
Raw coal sample 28 carries out covering pressure loading, covers pressure than calculating raw coal sample and carrying by area, and corresponding coal seam is original covers pressure；
Step 3, startup vacuum pump 9, carry out evacuation, are then turned on methane steel cylinder 11 and air relief valve 10 to high pressure tank body 2
Gas injection, and pressure constant state is kept, coal body equilibrium adsorption 8h；It is then turned off the valve of evacuation-gas injection system；
Step 4, unlatching high pressure water-injection pump 4, boosted (pressure value is higher than gas pressure in pressure pan body), opens note
Water system valve, carries out pre-conditioned (constant pressure or constant current) water filling, and gathers number pressure at the injecting process water filling port and tank wall
According to, be observation water coal body it is grand-microscopical structure in migration rule, hybrid pigment in water；
Step 5, complete coal seam with gas high pressure water enchroachment (invasion) experiment after, close high pressure water injection system valve, open methane steel cylinder
11 and air relief valve 10 to gas injection in tank body 2, and keep pressure constant state, in coal body, gas and water competitive Adsorption, balance 8h；
Step 6, turn-on data monitoring system and data collecting system, 28 Radial Flow Through Porous Media of high pressure methane Jing raw coal sample is extremely
Water filling floral tube 20, seepage flow initial stage are gas and water coexisting state, are treated as full gaseity, and after gas flow is stable, read test knot
Really, Jing following formulas calculate the high pressure water enchroachment (invasion) permeability of raw coal containing gas：
In formula：Permeabilities of the K for coal sample, mD, μ are gas viscosity, p0For the atmospheric pressure of laboratory, Pa；Q0For gas stream
Amount, ml/s；pw、peRespectively inner and outer boundary pressure, MPa；rw、reRespectively inner and outer boundary radius, cm；H be raw coal thickness, cm.
To build the deformation of high pressure water enchroachment (invasion) raw coal microcosmic adsorption swelling with macroscopical seepage flow coupling model, it is considered to which coal is to noble gases
(Ar) low absorbability, based on above-mentioned experimental procedure, designs：Ar is being dried raw coal, is being dried (the different pressures of absorption of raw coal containing gas
Power methane), high pressure water enchroachment (invasion) raw coal (different water enchroachment (invasion) pressure, without methane), high pressure water enchroachment (invasion) raw coal containing gas (different water enchroachment (invasion) pressure, watt
This pressure) and radial direction stable state of the methane under the conditions of 5 classes such as high pressure water enchroachment (invasion) raw coal containing gas (different water enchroachment (invasion) pressure, gas pressure)
Seepage Experiment；KAr-PAr, KAr-P methane, KAr-P water, KAr-P methane and water, K methane-P methane and Shui Te in being tested
Levy curve.
It should be noted that any equivalent way that those skilled in the art are made under the teaching of this specification, or
Obvious variant all should be within the scope of the present invention.
Claims (6)
1. a kind of manufacture method of raw coal sample, it is characterised in that comprise the following steps successively：
A chooses the cube coal sample of certain size as experiment coal sample along coal-face, and the experiment coal sample is cut into one
The column sample of sizing, and its surface is polished, water injection hole is drilled through from top to bottom in the column sample center,
Water filling floral tube is installed in the water injection hole, by two end seals of the water filling floral tube；
B is placed on the column sample for being installed on water filling floral tube in ring-type permeation cylinder, pours water in the base of ring-type permeation cylinder
Mud, installs permeability cell between its inwall and column sample, and the permeability cell is by penetrating the support of ring-type permeation cylinder casing wall
Bar is fixed, joints cement in the space formed with the column sample to the ring-type permeation cylinder casing wall, until covering sample
Till top surface certain thickness, platen is installed at the top of the column sample；
The support bar after theing cement solidifies in ring-type permeation cylinder is taken out, obtains final product raw coal sample by c.
2. the manufacture method of raw coal sample according to claim 1, it is characterised in that：The size of the column sample is
300 × h50mm of Φ, a diameter of 10mm of the water injection hole.
3. the assay method of a kind of high pressure water injection of raw coal containing gas and radial direction gas permeation rate, it is characterised in that including following step
Suddenly：Step one, preparing experiment system, the experimental system include testing tank body, cover pressure loading system, high pressure water injection system, take out
Vacuum-gas injection system, data monitoring system and data collecting system, the experiment tank body include tank body, in the tank body
Surrounding be provided with air inlet, water inlet, gas outlet and pressure transmitter interface, be originally provided with ring-type permeation in vivo in the tank
Cylinder, the ring-type permeation cylinder are closely embedded in tank inner body wall, and communicate with the air inlet, place in the ring-type permeation cylinder
Such as the raw coal sample that claim 1 or 2 is prepared, platen is placed above the raw coal sample, install T above the platen
Type piston, installs the sealing cover body for sealing to the tank body above the T-shaped piston；It is described to cover pressure loading system and institute
Sealing cover body connection is stated, the high pressure water injection system is connected with the water inlet by pipeline, and the evacuation-gas injection system leads to
Piping is connected with the air inlet, and the pressure transmitter interface is connected to the data monitoring system；The data acquisition
System includes gas collecting apparatus, and the gas collecting apparatus is connected with the gas outlet by pipeline；
Step 2, Ar, and turn-on data monitoring system are originally injected in vivo to the tank by evacuation-gas injection system, detection is real
The air-tightness of check system, closes evacuation-gas injection system after air-tightness is good；
Pressure loading system is covered in step 3, startup, the raw coal sample in ring-type permeation cylinder is carried out covering pressure loading, by area than counting
Calculate raw coal sample and carry and cover pressure, correspondingly coal seam is original covers pressure；
Step 4, startup evacuation-gas injection system, first carry out evacuation to tank body, then reinject methane, and keep constant pressure
State, after raw coal sample equilibrium adsorption 8h, closes evacuation-gas injection system；
Step 5, unlatching high pressure water injection system, are closed after coal seam with gas high pressure water enchroachment (invasion) experiment to be done to the internal water filling of tank sheet
High pressure water injection system, now opens evacuation-gas injection system and originally injects methane in vivo to tank, and keep pressure constant state, in the original
In coal sample, gas and water competitive Adsorption, balance 8h；
Step 6, turn-on data acquisition system, raw coal sample Radial Flow Through Porous Media described in methane Jing to water filling floral tube, the seepage flow initial stage is
Gas and water coexisting state, treats as full gaseity, and after gas flow is stable, read test result calculates water under high pressure according to formula (1)
Invade the permeability of the sample of raw coal containing gas：
In formula：Permeabilities of the K for coal sample, mD, μ are gas viscosity, p0For the atmospheric pressure of laboratory, Pa；Q0For gas flow,
ml/s；pw、peRespectively inner and outer boundary pressure, MPa；rw、reRespectively inner and outer boundary radius, cm；H be raw coal thickness, cm.
4. the assay method of the high pressure water injection of raw coal containing gas according to claim 3 and radial direction gas permeation rate, its feature
It is：The pressure loading system of covering includes electro-hydraulic servo control oil pressure pump, by the electro-hydraulic servo control oil pressure pump to T-shaped work
Plug applies pressure, so as to the pressure of covering completed to raw coal sample is loaded.
5. the assay method of the high pressure water injection of raw coal containing gas according to claim 3 and radial direction gas permeation rate, its feature
It is：Mass flowmenter is additionally provided with the pipeline being connected with the gas collecting apparatus, the data monitoring system includes computer
And data acquisition unit, the data acquisition unit is by pressure transmitter interface and mass flowmenter described in connection.
6. the assay method of the high pressure water injection of raw coal containing gas according to claim 3 and radial direction gas permeation rate, its feature
It is：Evacuation-the gas injection system includes vacuum pump, air relief valve, methane steel cylinder and Ar steel cylinders, the methane steel cylinder and Ar steel
Bottle is connected on the gas injection port by pipeline, and the vacuum pump and air relief valve are installed in the pipe between methane steel cylinder and gas injection port
On road.
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| CN113358480A (en) * | 2021-05-13 | 2021-09-07 | 太原理工大学 | Coal rock mechanical test device and test method |
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