CN112432881A - Gas pore pressure monitoring device bearing axial fixing point in gas-containing coal body - Google Patents
Gas pore pressure monitoring device bearing axial fixing point in gas-containing coal body Download PDFInfo
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- 239000011148 porous material Substances 0.000 title claims abstract description 93
- 239000003245 coal Substances 0.000 title claims abstract description 79
- 238000012806 monitoring device Methods 0.000 title claims abstract description 20
- 239000007789 gas Substances 0.000 claims abstract description 148
- 238000012360 testing method Methods 0.000 claims abstract description 38
- 238000000034 method Methods 0.000 claims abstract description 12
- 238000009530 blood pressure measurement Methods 0.000 claims abstract description 4
- 238000005259 measurement Methods 0.000 claims abstract description 4
- 238000003795 desorption Methods 0.000 claims description 26
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 20
- 238000003825 pressing Methods 0.000 claims description 9
- 239000001307 helium Substances 0.000 claims description 8
- 229910052734 helium Inorganic materials 0.000 claims description 8
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 8
- 238000002474 experimental method Methods 0.000 claims description 6
- 230000000087 stabilizing effect Effects 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 3
- 238000009423 ventilation Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims 1
- 238000013508 migration Methods 0.000 abstract description 15
- 230000005012 migration Effects 0.000 abstract description 15
- 238000011160 research Methods 0.000 abstract description 9
- 230000008569 process Effects 0.000 abstract description 6
- 238000009792 diffusion process Methods 0.000 abstract description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 4
- 230000007246 mechanism Effects 0.000 abstract description 4
- 238000010168 coupling process Methods 0.000 abstract description 3
- 239000007787 solid Substances 0.000 abstract description 3
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 2
- 238000005065 mining Methods 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 239000003034 coal gas Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000012545 processing 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
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N13/04—Investigating osmotic effects
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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
- G01N15/0806—Details, e.g. sample holders, mounting samples for testing
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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
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N7/00—Analysing materials by measuring the pressure or volume of a gas or vapour
- G01N7/02—Analysing materials by measuring the pressure or volume of a gas or vapour by absorption, adsorption, or combustion of components and measurement of the change in pressure or volume of the remainder
- G01N7/04—Analysing materials by measuring the pressure or volume of a gas or vapour by absorption, adsorption, or combustion of components and measurement of the change in pressure or volume of the remainder by absorption or adsorption alone
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N7/00—Analysing materials by measuring the pressure or volume of a gas or vapour
- G01N7/10—Analysing materials by measuring the pressure or volume of a gas or vapour by allowing diffusion of components through a porous wall and measuring a pressure or volume difference
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N2013/003—Diffusion; diffusivity between liquids
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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
- G01N2015/0866—Sorption
- G01N2015/0873—Dynamic sorption, e.g. with flow control means
Abstract
The utility model provides a gas pore pressure monitoring devices of coal body gas migration process axial fixed point, includes coal sample loading pressure chamber, axle load, confined pressure loading system, gas pore pressure loading system, steady voltage system, gas pressure measurement system and gas flow measurement system. The axial pressure and confining pressure of the coal sample are supplied by a manual pressure test pump, and the pressure is kept stable through an energy accumulator after pressurization; the pore pressure is adjusted to reach a required value by high-pressure nitrogen through a gas pressure adjusting valve; the pore pressure, confining pressure and axial pressure values are measured by a high-precision digital pressure sensor; the amount of seepage gas is measured by a flow meter. The method can measure the gas pore pressure at the inlet, the outlet, the additional point and the initial point of the test piece, provide the required initial value, the edge value and the additional condition for the identification of the unknown source function in the gas migration equation, determine the seepage influence mechanism model caused by the diffusion of the gas migration, and lay the theoretical foundation for the fluid-solid coupling method to research the migration rule of the coal bed gas.
Description
Technical Field
The invention relates to the technical field of gas detection experimental appliances, in particular to a gas pore pressure monitoring device for bearing an axial fixed point in a gas-containing coal body.
Background
Gas explosion and coal and gas outburst are major disasters in the coal mine production process, the mine gas subject system is gradually improved from the beginning of the last century to the present, but the theory of coal and gas outburst still remains in a semi-quantitative stage, and the problem of how to greatly improve the permeability coefficient of a coal bed in the aspect of coal bed gas development is still a problem in China. The research on the occurrence and the flow of the gas in the coal bed has great significance for outburst prevention and coal bed gas exploitation. Therefore, research on the method for measuring and calculating the gas permeability of the coal bed is a key technology for the development of gas seepage mechanics, and is also a key point for coal mine safety workers to research a series of mine safety problems such as coal and gas outburst.
In the original state of coal bed not being exploited, gas is mainly in two states of adsorption state and free state in the pores and fissures of coal body, wherein the adsorption state accounts for most of the gas. In the coal mining process, under the influence of external mining (coal mining and gas extraction), the stress in the coal body is redistributed, and the structure of pore fractures is changed, so that the adsorbed gas enters the fractures through desorption and diffusion and becomes a source for gas emission from the coal wall through seepage. Therefore, it is necessary to research an interaction mechanism between a diffusion mode and a seepage mode of gas, and a traditional triaxial seepage experiment of gas in a coal sample has no intermediate pressure measurement requirement, and the existing equipment cannot measure the pore pressure of gas at an axial fixed point of a standard test piece, so that the desorption-diffusion-seepage migration process of gas in a coal body is difficult to research.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a gas pore pressure monitoring device for bearing an axial fixed point in a coal body containing gas, which takes the pore pressure of gas in a coal body test piece as a variable and researches the source convergence effect of adsorbed nitrogen in the test piece on seepage. By developing a migration experiment of methane gas in a coal body test piece, the change of the methane gas pressure at different positions along the axial direction of the test piece along with time is measured, an unknown source function in a mass conservation equation of migration is further solved, a seepage influence mechanism model caused by diffusion of the gas migration is determined, and a theoretical basis is laid for a fluid-solid coupling method to research the migration rule of coal bed gas.
In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a bear gas pore pressure monitoring devices who contains axial fixity point in gas coal body, includes coal sample loading pressure chamber, axle pressure, confined pressure loading system, gas pore pressure loading system, steady voltage system, gas pressure measurement system, gas flow measurement system and tail gas processing system. The axial pressure and confining pressure of the coal sample are supplied by a manual pressure test pump, and the pressure is kept stable through an energy accumulator after pressurization; the pore pressure is adjusted to reach a required value by high-pressure methane through a gas pressure adjusting valve; the pore pressure, confining pressure and axial pressure values are measured by a high-precision digital pressure sensor; the amount of seepage gas is measured by a flow meter.
The coal sample loading pressure chamber consists of a coal sample, a stress-seepage-desorption cavity, a piston, a pressure plate with a through hole, an upper pressure head, a lower pressure head and a clamp holder with a pressure measuring hole, wherein the pressure plate is transversely arranged in the stress-seepage-desorption cavity to divide the stress-seepage-desorption cavity into a first cavity and a second cavity, the upper pressure head and the lower pressure head are respectively arranged at two ends of the first cavity, the piston is arranged in the second cavity, a first bulge is arranged on the inner end surface of the piston, the end surface of the first bulge is arranged in the first cavity through the through hole of the pressure plate, grooves are respectively arranged on the end surface of the first bulge of the piston and the end surface of the stress-seepage-desorption cavity opposite to the first bulge of the piston, and the lower ends of the upper pressure head and the lower pressure head are respectively arranged in the grooves, and the coal sample is arranged between the upper pressure head and the lower pressure head; the stress-seepage-desorption cavity is composed of a barrel, a base and a clamp holder, the base is arranged at the lower end of the barrel and is fixedly connected with the barrel through the clamp holder, the first pipeline is communicated with the first cavity through the base, the pressing plate is arranged at the upper end of the barrel and is fixedly connected with the barrel through the clamp holder, the second pipeline is communicated with the second cavity through the clamp holder, the barrel and the pressing plate form a first cavity, the pressing plate, the base and the clamp holder form a second cavity, the base is provided with an exhaust hole, the outer end of the piston is provided with a second bulge, the second bulge is provided with a through hole, a piston through hole is arranged on the piston, the outer end of the piston through hole is communicated with the outside, and the clamp holder is provided.
The confining pressure system comprises a manual pressure test pump, a confining pressure energy accumulator, a confining pressure first valve and a confining pressure gauge, the manual pressure test pump is communicated with a first cavity through a first pipeline, the confining pressure first valve, the confining pressure second valve and the confining pressure gauge are arranged on the first pipeline, the axial pressure system comprises the manual pressure test pump, an axial pressure energy accumulator, an axial pressure first valve and an axial pressure gauge, the manual pressure test pump is communicated with a second cavity between the outer end face of the piston and the end face of the stress-seepage-desorption cavity through a second pipeline, and the axial pressure first valve, the axial pressure second valve and the axial pressure gauge are arranged on the second pipeline;
the pore pressure system consists of a high-pressure gas cylinder, a first flowmeter, a pore pressure inlet first valve and a pore pressure inlet pressure gauge, wherein the high-pressure gas cylinder is communicated with one side end face of the coal sample loading pressure chamber through a third pipeline, and the third pipeline is provided with the first flowmeter, the pore pressure inlet first valve, the pore pressure inlet second valve and the pore pressure inlet pressure gauge;
the pressure stabilizing system consists of a first valve of a manual pressure test pump, a second valve of the manual pressure test pump, a confining pressure second valve, a shaft pressure second valve, a pore pressure inlet second valve, a pore pressure outlet second valve and a digital pressure gauge.
The tail gas treatment system consists of a tail gas collecting bottle, a second flowmeter, a first pore pressure outlet valve and a pore pressure outlet pressure gauge, wherein the tail gas collecting bottle is communicated with the end surface of the other side of the coal sample loading pressure chamber through a fourth pipeline, and the second flowmeter, the first pore pressure outlet valve, the second pore pressure outlet valve and the pore pressure outlet pressure gauge are respectively arranged on the connected pipelines;
the gas pressure measuring system comprises a pressure sensor, a data line, a DDS data acquisition system and a computer, and the pore pressure, confining pressure and axial pressure values are measured by using a high-precision digital pressure sensor; the pressure sensor is connected with the DDS data acquisition system and the computer through a clamp with a pressure measuring hole;
the gas flow measuring system comprises a flowmeter, a DDS data acquisition system and a computer, and the seepage gas flow value is measured by the flowmeter.
An experimental method for a gas pore pressure monitoring device bearing an axial fixed point in a gas-containing coal body adopts the gas pore pressure monitoring device bearing the axial fixed point in the gas-containing coal body, and comprises the following steps:
the method comprises the following steps: a connecting device for ventilation and checking air tightness;
step two: pumping air in the coal sample by a vacuum pump to reduce the air pressure in the coal sample to below 50 Pa;
step three: opening all valves of the confining pressure loading system, slowly pressurizing to 3MPa in a confining pressure chamber and a confining pressure energy accumulator in a stress-seepage-desorption cavity, and closing the valves of the confining pressure loading system;
step four: opening all valves of the axial pressure loading system, slowly pressurizing to 4MPa in an axial pressure chamber and an axial pressure accumulator in the stress-seepage-desorption cavity, and closing the valves of the axial pressure loading system;
step five: opening a high-pressure helium tank and a valve of a pressure reducing valve, increasing the methane pressure to 1MPa, and reading the flow rate of helium at an outlet end by a flowmeter;
step six: opening valves of a high-pressure gas tank and a pressure reducing valve, adding the gas pressure to 1MPa, keeping the gas pressure unchanged, allowing the coal sample to fully adsorb gas for 24 hours, and recording the flow measured by a flow meter at an inlet and an outlet;
step seven: and closing the valve of the air inlet pipe and recording the pressure measured by the gas pressure sensor.
The invention has the beneficial effects that:
the invention provides a gas pore pressure monitoring device for bearing an axial fixed point in a coal body containing gas, which takes the pore pressure of gas in a coal body test piece as a variable and researches the source convergence effect of adsorbed methane in the test piece on seepage. By developing a migration experiment of methane gas in a coal body test piece, the change of the methane gas pressure at different positions along the axial direction of the test piece along with time is measured, an unknown source function in a mass conservation equation of migration is further solved, a seepage influence mechanism model caused by diffusion of gas migration is determined, and a theoretical basis is laid for researching the migration rule of coal bed gas by a fluid-solid coupling method.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a portion of the present invention;
in the figure, 1-coal sample, 2-stress-seepage-desorption cavity, 3-piston, 4-pressing plate, 5-upper pressing head, 6-lower pressing head, 7-clamper, 8-first cavity, 9-second cavity, 10-first bulge, 11-second bulge, 12-cylinder, 13-base, 14-manual pressure test pump, 15-axial pressure accumulator, 16-confining pressure first valve, 17-confining pressure gauge, 18-axial pressure first valve, 19-axial pressure gauge, 20-high pressure gas cylinder, 21-first flowmeter, 22-pore pressure inlet first valve, 23-pore pressure inlet pressure gauge, 24-tail gas collecting bottle, 25-second flowmeter, 26-pore pressure outlet valve, 27-pore pressure outlet pressure gauge, 28-first pipeline, 29-second pipeline, 30-third pipeline, 31-fourth pipeline, 32-pressure sensor, 33-DDS data acquisition system, 34-computer, 35-pressure reducing valve, 36-confining pressure accumulator, 37-data line, 38-first valve of manual pressure test pump, 39-second valve of manual pressure test pump, 40-confining pressure second valve, 41-axial pressure second valve, 42-second valve of pore pressure inlet, and 43-second valve of pore pressure outlet.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
As shown in fig. 1, a gas pore pressure monitoring device bearing an axial fixed point in a gas-containing coal body comprises a coal sample loading pressure chamber, an axial pressure and confining pressure loading system, a gas pore pressure loading system, a pressure stabilizing system, a gas pressure measuring system, a gas flow measuring system and a tail gas treatment system; the axial pressure and confining pressure of the coal sample 1 are supplied by a manual pressure test pump 14, and the pressure is kept stable through an energy accumulator after pressurization; the pore pressure is adjusted to reach a required value by high-pressure methane through a gas pressure adjusting valve; the pore pressure, confining pressure and axial pressure values are measured by a high-precision digital pressure sensor 32; the amount of seepage gas is measured by first flow meter 21 and first flow meter 25.
The coal sample loading pressure chamber consists of a coal sample 1, a stress-seepage-desorption cavity 2, a piston 3, a pressure plate 4 with a through hole, an upper pressure head 5, a lower pressure head 5, a pressure head 6 and a clamp 7 with a pressure measuring hole, wherein the pressure plate 4 is transversely arranged in the stress-seepage-desorption cavity 2 to divide the stress-seepage-desorption cavity 2 into a first cavity body 8 and a second cavity body 9, the upper pressure head 5 and the lower pressure head 6 are respectively arranged at two ends of the first cavity body 8, the piston 3 is arranged in the second cavity body 9, a first bulge 10 is arranged on the inner end surface of the piston 3, the end surface of the first bulge 10 is arranged in the first cavity body 8 through the through hole of the pressure plate 4, grooves are respectively arranged on the end surface of the first bulge 10 of the piston 3 and the end surface of the stress-seepage-desorption cavity 2 opposite to the first bulge, the upper end of the upper pressure head 5 and the lower end of the lower pressure head 6 are respectively arranged in the grooves, the coal sample 1 is arranged between an upper pressure head 5 and a lower pressure head 6; the stress-seepage-desorption cavity 2 consists of a cylinder 12, a base 13 and a clamp holder 7, the base 13 is arranged at the lower end of the cylinder 12 and is fixedly connected with the cylinder 12 through the clamp holder 7, the first pipeline 28 is communicated with the first cavity 8 through the base 13, the pressure plate 4 is arranged at the upper end of the cylinder 12 and is fixedly connected with the cylinder 12 through the clamp holder 7, the second pipeline 29 is communicated with the second cavity 9 through the clamp holder 7, the cylinder 12 and the pressure plate 4 form the first cavity 8, the pressure plate 4, the base 13 and the clamp holder 7 form the second cavity 9, the base 13 is provided with an exhaust hole, the outer end of the piston 3 is provided with a second bulge 11, the second bulge 11 is provided with a through hole, the piston 3 is provided with a piston through hole, and the outer end of the piston through hole is communicated with the outside; the clamp 7 is provided with a pressure measuring hole;
the confining pressure system comprises a manual pressure test pump 14, a confining pressure energy accumulator 36, a confining pressure first valve 16 and a confining pressure gauge 17, the manual pressure test pump 14 is communicated with a first cavity 8 through a first pipeline 28, the confining pressure first valve 16, a confining pressure second valve 40 and the confining pressure gauge 17 are arranged on the first pipeline 28, the axial pressure system comprises the manual pressure test pump 14, an axial pressure energy accumulator 15, an axial pressure first valve 18 and an axial pressure gauge 19, the manual pressure test pump 14 is communicated with a second cavity 9 between the outer end surface of a piston 3 and the end surface of a stress-seepage-desorption cavity 2 through a second pipeline 29, and the axial pressure first valve 18, the axial pressure second valve 41 and the axial pressure gauge 19 are arranged on the second pipeline 29;
the pore pressure system consists of a high-pressure gas cylinder 20, a first flowmeter 21, a pore pressure first inlet valve 22 and a pore pressure inlet pressure gauge 23, wherein the high-pressure gas cylinder 20 is communicated with one side end face of the coal sample loading pressure chamber through a third pipeline 30, and the third pipeline 30 is provided with the flowmeter 21, the pore pressure first inlet valve 22, the pore pressure second inlet valve 42 and the pore pressure inlet pressure gauge 23;
the pressure stabilizing system comprises a first manual pressure test pump valve 38, a second manual pressure test pump valve 39, a confining pressure second valve 40, a shaft pressure second valve 41, a pore pressure inlet second valve 42, a pore pressure outlet second valve 43 and a digital pressure gauge.
The tail gas treatment system consists of a tail gas collecting bottle 24, a second flowmeter 25, a pore pressure outlet valve 26 and a pore pressure outlet pressure gauge 27, wherein the tail gas collecting bottle 24 is communicated with the other end face of the coal sample loading pressure chamber through a fourth pipeline 31, and the second flowmeter 25, the pore pressure outlet first valve 27, the pore pressure outlet second valve 43 and the pore pressure outlet pressure gauge 26 are respectively arranged on the connected pipelines;
the gas pressure measuring system comprises a pressure sensor 32, a data line 37, a DDS data acquisition system 33 and a computer 34, and the pore pressure, confining pressure and axial pressure values are measured by using a high-precision digital pressure sensor 32; the pressure sensor 32 is connected with a DDS data acquisition system 33 and a computer 34 through a clamp 7 with a pressure measuring hole;
the gas flow measurement system comprises a first flowmeter 24 and a second flowmeter 25, a DDS data acquisition system 33 and a computer 34, and the seepage gas flow value is measured by the flowmeters.
The one-time use process of the present invention is described below with reference to the accompanying drawings:
in the embodiment, (1) the ambient pressure of a raw coal test piece is constant at 3MPa, the temperature is unchanged, and the flow of helium is measured when the shaft pressure is respectively 4MPa, 6MPa, 8MPa, 10MPa and 12MPa and the inlet gas pressure is 1MPa so as to calculate the average permeability of the test piece; (2) the confining pressure of a raw coal test piece is kept at 3MPa, the temperature is unchanged, the pressure of inlet gas is kept at 1MPa, after adsorption balance, an inlet end valve is closed, the gas pressure at each pressure measuring point is measured by a gas pressure sensor, and the gas flow is measured by a gas flowmeter at an outlet end.
An experimental method for a gas pore pressure monitoring device at an axial fixed point in a coal gas migration process adopts the gas pore pressure monitoring device at the axial fixed point in the coal gas migration process, and comprises the following steps:
the method comprises the following steps: a connecting device for ventilation and checking air tightness;
step two: pumping air in the coal sample 1 by a vacuum pump to reduce the air pressure in the coal sample 1 to below 50 Pa;
step three: opening all valves of the confining pressure loading system, slowly pressurizing to 3MPa in a confining pressure chamber and a confining pressure energy accumulator 36 in the stress-seepage-desorption cavity 2, and closing the valves of the confining pressure loading system;
step four: opening all valves of the axial pressure loading system, slowly pressurizing to 4MPa in an axial pressure chamber in the stress-seepage-desorption cavity 2 and the axial pressure accumulator 15, and closing the valves of the axial pressure loading system;
step five: opening a high-pressure helium tank and a valve of a pressure reducing valve 35, increasing the helium pressure to 1MPa, and reading the helium flow at an outlet end by a flowmeter;
step six: opening valves of the high-pressure gas tank 20 and the pressure reducing valve 35, adding the gas pressure to 1MPa, keeping the gas pressure unchanged, allowing the coal sample 1 to fully adsorb gas for 24h, and recording the flow measured by the flow meter at the inlet and the outlet;
step seven: and closing the valve of the air inlet pipe and recording the pressure measured by the gas pressure sensor.
The embodiments are not intended to limit the scope of the present invention, and all equivalent implementations or modifications without departing from the scope of the present invention are intended to be included in the scope of the present invention.
Claims (8)
1. The utility model provides a bear and contain gas pore pressure monitoring devices of axial fixity point in the gas coal body which characterized in that: the device comprises a coal sample loading pressure chamber, an axial pressure and confining pressure loading system, a gas pore pressure loading system, a gas pressure measurement system, a gas flow measurement system and a tail gas treatment system. The axial pressure and confining pressure of the coal sample are supplied by a manual pressure test pump, and the pressure is kept stable through an energy accumulator after pressurization; the pore pressure is adjusted to reach a required value by high-pressure methane through a gas pressure adjusting valve; the pore pressure, confining pressure and axial pressure values are measured by a high-precision digital pressure sensor; the amount of seepage gas is measured by a first flow meter and a second flow meter.
2. The apparatus of claim 1, wherein the gas pore pressure monitoring device is configured to monitor the gas pore pressure at an axially fixed point in the gas-containing coal body: the coal sample loading pressure chamber consists of a coal sample, a stress-seepage-desorption cavity, a piston, a pressure plate with a through hole, an upper pressure head, a lower pressure head and a clamp holder with a pressure measuring hole, wherein the pressure plate is transversely arranged in the stress-seepage-desorption cavity to divide the stress-seepage-desorption cavity into a first cavity and a second cavity, the upper pressure head and the lower pressure head are respectively arranged at two ends of the first cavity, the piston is arranged in the second cavity, a first bulge is arranged on the inner end surface of the piston, the end surface of the first bulge is arranged in the first cavity through the through hole of the pressure plate, grooves are respectively arranged on the end surface of the first bulge of the piston and the end surface of the stress-seepage-desorption cavity opposite to the first bulge of the piston, and the lower ends of the upper pressure head and the lower pressure head are respectively arranged in the grooves, and the coal sample is arranged between the upper pressure head and the lower pressure head; the stress-seepage-desorption cavity is composed of a barrel, a base and a clamp holder, the base is arranged at the lower end of the barrel and is fixedly connected with the barrel through the clamp holder, the first pipeline is communicated with the first cavity through the base, the pressing plate is arranged at the upper end of the barrel and is fixedly connected with the barrel through the clamp holder, the second pipeline is communicated with the second cavity through the clamp holder, the barrel and the pressing plate form a first cavity, the pressing plate, the base and the clamp holder form a second cavity, the base is provided with an exhaust hole, the outer end of the piston is provided with a second bulge, the second bulge is provided with a through hole, a piston through hole is arranged on the piston, the outer end of the piston through hole is communicated with the outside, and the clamp holder is provided.
3. The apparatus of claim 1, wherein the gas pore pressure monitoring device is configured to monitor the gas pore pressure at an axially fixed point in the gas-containing coal body: the confining pressure system comprises a manual pressure test pump, a confining pressure energy accumulator, a confining pressure first valve and a confining pressure gauge, the manual pressure test pump is communicated with a first cavity through a first pipeline, the confining pressure first valve, the confining pressure second valve and the confining pressure gauge are arranged on the first pipeline, the axial pressure system comprises the manual pressure test pump, the axial pressure energy accumulator, the axial pressure first valve and the axial pressure gauge, the manual pressure test pump is communicated with a second cavity between the outer end face of a piston and the end face of a stress-seepage-desorption cavity through a second pipeline, and the axial pressure first valve, the axial pressure second valve and the axial pressure gauge are arranged on the second pipeline.
4. The apparatus of claim 1, wherein the gas pore pressure monitoring device is configured to monitor the gas pore pressure at an axially fixed point in the gas-containing coal body: the pore pressure system comprises a high-pressure gas cylinder, a first flowmeter, a pore pressure inlet first valve and a pore pressure inlet pressure gauge, wherein the high-pressure gas cylinder is communicated with one side end face of the coal sample loading pressure chamber through a third pipeline, and the third pipeline is provided with the first flowmeter, the pore pressure inlet first valve, the pore pressure inlet second valve and the pore pressure inlet pressure gauge.
5. The apparatus of claim 1, wherein the gas pore pressure monitoring device is configured to monitor the gas pore pressure at an axially fixed point in the gas-containing coal body: the pressure stabilizing system consists of a first valve of a manual pressure test pump, a second valve of the manual pressure test pump, a confining pressure second valve, a shaft pressure second valve, a pore pressure inlet second valve, a pore pressure outlet second valve and a digital pressure gauge.
6. The apparatus of claim 1, wherein the gas pore pressure monitoring device is configured to monitor the gas pore pressure at an axially fixed point in the gas-containing coal body: the tail gas treatment system consists of a tail gas collecting bottle, a second flowmeter, a first valve of a pore pressure outlet and a pressure gauge of the pore pressure outlet, wherein the tail gas collecting bottle is communicated with the end surface of the other side of the coal sample loading pressure chamber through a fourth pipeline, and the second flowmeter, the first valve of the pore pressure outlet, the second valve of the pore pressure outlet and the pressure gauge of the pore pressure outlet are respectively arranged on the pipelines connected with each other.
7. The apparatus of claim 1, wherein the gas pore pressure monitoring device is configured to monitor the gas pore pressure at an axially fixed point in the gas-containing coal body: the gas pressure measuring system comprises a pressure sensor, a data line, a DDS data acquisition system and a computer, and the pore pressure, confining pressure and axial pressure values are measured by using a high-precision digital pressure sensor; the pressure sensor is connected with the DDS data acquisition system and the computer through a clamp with a pressure measuring hole; the gas flow measuring system comprises a flowmeter, a DDS data acquisition system and a computer, and the seepage gas flow value is measured by the flowmeter.
8. A gas pore pressure monitoring experiment method for bearing an axial fixed point in a gas-containing coal body adopts a gas pore pressure monitoring device for bearing the axial fixed point in the gas-containing coal body, and comprises the following steps:
the method comprises the following steps: a connecting device for ventilation and checking air tightness;
step two: pumping air in the coal sample by a vacuum pump to reduce the air pressure in the coal sample to below 50 Pa;
step three: opening all valves of the confining pressure loading system, slowly pressurizing to 3MPa in a confining pressure chamber and a confining pressure energy accumulator in a stress-seepage-desorption cavity, and closing the valves of the confining pressure loading system;
step four: opening all valves of the axial pressure loading system, slowly pressurizing to 4MPa in an axial pressure chamber and an axial pressure accumulator in the stress-seepage-desorption cavity, and closing the valves of the axial pressure loading system;
step five: opening a high-pressure helium tank and a valve of a pressure reducing valve, increasing the methane pressure to 1MPa, and reading the flow rate of helium at an outlet end by a flowmeter;
step six: opening valves of a high-pressure gas tank and a pressure reducing valve, adding the gas pressure to 1MPa, keeping the gas pressure unchanged, allowing the coal sample to fully adsorb gas for 24 hours, and recording the flow measured by a flow meter at an inlet and an outlet;
step seven: and closing the valve of the air inlet pipe and recording the pressure measured by the gas pressure sensor.
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