CN111521516A - Coal body gas adsorption and strain test system - Google Patents
Coal body gas adsorption and strain test system Download PDFInfo
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- CN111521516A CN111521516A CN201911262885.1A CN201911262885A CN111521516A CN 111521516 A CN111521516 A CN 111521516A CN 201911262885 A CN201911262885 A CN 201911262885A CN 111521516 A CN111521516 A CN 111521516A
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- 239000003245 coal Substances 0.000 title claims abstract description 79
- 238000001179 sorption measurement Methods 0.000 title claims abstract description 43
- 238000012360 testing method Methods 0.000 title claims abstract description 37
- 239000007789 gas Substances 0.000 claims abstract description 136
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 15
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 15
- 238000003795 desorption Methods 0.000 claims description 23
- 230000008859 change Effects 0.000 claims description 12
- 238000002474 experimental method Methods 0.000 claims description 9
- 238000005259 measurement Methods 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 238000007872 degassing Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 238000013401 experimental design Methods 0.000 claims description 3
- 239000004519 grease Substances 0.000 claims description 3
- 239000000565 sealant Substances 0.000 claims description 3
- 230000003014 reinforcing effect Effects 0.000 claims 1
- 238000007789 sealing Methods 0.000 claims 1
- 239000003034 coal gas Substances 0.000 abstract 1
- 239000011435 rock Substances 0.000 description 11
- 239000011148 porous material Substances 0.000 description 5
- 230000007246 mechanism Effects 0.000 description 4
- 238000013508 migration Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
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- 230000006866 deterioration Effects 0.000 description 1
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- 238000005065 mining Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000003068 static effect Effects 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
- 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
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/32—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring the deformation in a solid
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/32—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
- G01M3/3236—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers
- G01M3/3272—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers for verifying the internal pressure of closed containers
Abstract
The invention provides a coal gas adsorption and strain testing system which comprises a standard chamber (1), a sample chamber (2), a gas tank (3), a nitrogen tank (42), a vacuum pump (41), a booster pump (5), a standard chamber gas collection tank (6), a sample chamber gas collection tank (8), a standard chamber volumetric flask (7), a sample chamber volumetric flask (9) and a control center. This application adopts standard room and sample room contrast, adopts high accuracy flowmeter, data when high accuracy pressure gauge accuracy collection coal body sample adsorbs gas, adopts the gas drainage method to combine automatic liquid level tracker to obtain data when coal body sample desorbs gas, simultaneously through the pyrocondensation pipe box that has the extensometer at the outside cover of coal body sample, the control center is automatic to obtain the strain data of the coal body that the extensometer reaction was out when adsorbing and desorbing, realizes full automatic operation, the experimental data accuracy is high.
Description
Technical Field
The invention relates to the technical field of coal body adsorption, in particular to a system for testing gas adsorption and strain of coal bodies.
Background
The interaction mechanism of coal and gas is a basic scientific problem of research in the field of gas disaster prevention and control, has an important guiding function for researching the coal rock gas dynamic disaster mechanism of a mine, and provides an important technical support for coal bed gas extraction or coal bed gas development. Mine gas generated in the deterioration stage of coal is mainly adsorbed on the surface of micropores and borne in pores and cracks of a coal-rock mass. The coal body-surrounding rock system is in a relatively static balance state under the combined action of the gas pressure and the rock mass stress. When the underground mining activities enter the coal seam and its surrounding rocks, this equilibrium state is disturbed, resulting in redistribution of the coal-rock mass stress field and re-migration of gas in the coal strata. In the process of changing the equilibrium state, the change of the micro-structure of the coal body is influenced by the pore gas pressure generated by free gas and the coal body expansion deformation generated by adsorbed gas to a great extent besides the action of surrounding rock stress. A large number of practical phenomena and test results show that the change of the coal body property caused by gas adsorption and desorption plays an important role in the process of gas dynamic disaster. Therefore, the research on the dynamic evolution mechanism of gas adsorption and desorption deformation of the coal body plays an important role in deeply knowing the evolution mechanism of coal rock gas dynamic disasters. The deformation of adsorption and desorption is the inherent characteristic of the coal body, and the deformation value reflects the strength, the metamorphism degree, the coal bed temperature, the pore characteristics, the crack development degree and the strength of the gas-containing capability of the coal body. Under the same external conditions, the deformation values of the protruding coals are much greater than those of the non-protruding coals. Therefore, the adsorption and desorption deformation characteristics of the coal body also have an auxiliary effect on the measurement of the coal seam outburst risk. In addition, in the migration process of the coal bed gas, the coal body can generate expansion and contraction deformation due to the absorption and desorption of the gas, so that the mechanical property of the coal body is changed, the pore structure of the coal rock is changed, and the permeability of the coal rock is changed. Meanwhile, the occurrence and the flow of gas in the coal body are influenced by the change of the pore structure and the permeability coefficient of the coal rock. Therefore, to obtain the real migration rule of the coal bed gas, the influence of coal body adsorption and desorption deformation must be considered.
There are many methods for measuring the gas adsorption amount of coal, and the weight method and the volumetric method are mainly used. The volumetric method is to place coal in a closed system with known volume, and under a series of gas pressure, calculate the adsorbed amount of gas according to the gaseous equation, namely the relationship between gas mass and temperature, pressure and volume. The prior volumetric method testing device has certain limitation in measuring the deformation of adsorption and desorption, for example, a deformation measuring interface is not generally arranged on an adsorption and desorption tank; most of the gas pressure of the adsorption and desorption deformation test carried out by the existing equipment is within 5.0MPa, and the coal body under high pressure often shows different characteristics from that under low pressure, so a test device capable of realizing high-pressure adsorption deformation is also needed.
Disclosure of Invention
In order to overcome the problem of limitation of a test device in the prior art, the invention provides a system for testing gas adsorption and strain of coal.
The utility model provides a coal body adsorbs gas and strain test system, includes standard chamber, sample room, gas pitcher, nitrogen gas jar, vacuum pump, booster pump, standard chamber gas collection tank, sample room gas collection tank, standard chamber volumetric flask, sample room volumetric flask and control center, gas pitcher, vacuum pump loop through intake pipe, control valve and are connected with standard chamber, sample room, the standard chamber passes through the blast pipe, the ooff valve is connected with standard chamber gas collection tank, the standard chamber passes through the blast pipe, the control valve is connected with standard chamber volumetric flask, the outside pyrocondensation pipe cover that still overlaps of sample in the sample room, the pyrocondensation pipe is sheathe in and is equipped with the extensometer, the sample room passes through the blast pipe, the ooff valve is connected with sample room gas collection tank, the sample room passes through the blast pipe, the control valve is connected with sample room volumetric flask, the sample room is connected, the standard chamber with all be equipped with temperature control device and pressure sensor in the sample room, the standard volumetric flask with the sample volumetric flask still is equipped with automatic liquid level tracker, control center is connected with gas cylinder, vacuum pump, nitrogen gas jar, control valve, booster pump valve, ooff valve, automatic liquid level tracker, temperature control device, pressure sensor respectively.
In a preferred embodiment of the invention, the air inlet end of the standard chamber is also provided with a high-precision pressure gauge and a high-precision flow meter.
In a preferred embodiment of the invention, the inlet end of the sample chamber is also provided with a high-precision pressure gauge and a high-precision flow meter.
In a preferred embodiment of the present invention, the temperature control device includes a temperature sensor, a heating pipe, and a cooling pipe, and the temperature sensor, the heating pipe, and the cooling pipe are respectively connected to the control center.
In a preferred embodiment of the invention, the sample in the sample chamber is externally sleeved with a heat-shrinkable tube sleeve, and two ends of the heat-shrinkable tube sleeve are fixed by metal hoops.
In a preferred embodiment of the invention, the thermal shrinkage pipe sleeve is provided with an extensometer, the extensometer is connected with a control center, and the measurement and control range of the extensometer is 0-15mm in the axial direction and 0-7mm in the radial direction.
In a preferred embodiment of the invention, the measuring resolution of the extensometer is 0.5 μm in the axial direction and 0.2 μm in the radial direction, and the deformation measuring precision of the extensometer is less than or equal to +/-0.5%.
In a preferred embodiment of the invention, the sample and the heat shrinkable tube sleeve are sealed by using a Kafter sealant, and two ends of the heat shrinkable tube sleeve are reinforced by using metal hoops.
In a preferred embodiment of the present invention, the liquid in the standard chamber volumetric flask and the sample chamber volumetric flask is grease which does not dissolve gas.
In a preferred embodiment of the present invention, the operation steps of the coal body gas adsorption and strain testing system are as follows:
(1) putting a sample into a sample chamber, closing the sample chamber, preparing a vitreous standard part with the same specification as the sample, putting the standard part into a standard chamber, and closing the standard chamber;
(2) closing an exhaust pipe, a vacuum pump and a booster pump, opening a valve of a nitrogen tank, closing the valve of the nitrogen tank after a certain amount of nitrogen is introduced, recording the pressure change in a standard chamber and a sample chamber every 0.5h after the data of a pressure sensor is stable, if the pressure sensor does not change obviously within 3h, indicating that the air tightness is good, and if the pressure sensor changes obviously, indicating that the air tightness is poor, rechecking and assembling the test device;
(3) if the air tightness is good, opening a vacuum pump valve, degassing the standard part and the sample to eliminate the influence of excessive nitrogen adsorption on the test result of the standard part and the sample, wherein the degassing time is 1-3h, and closing the vacuum pump valve until the pressure sensor has no obvious change;
(4) controlling the temperature in the standard chamber to a specified temperature through a temperature control device, keeping the closing state of a switch valve and a control valve of an exhaust pipe, opening a valve of a gas tank, filling a certain amount of gas into the standard chamber until the pressure of a pressure sensor in the standard chamber reaches the experimental design pressure, collecting and recording data of a high-precision pressure gauge and a high-precision flow meter at the gas inlet end of the standard chamber, obtaining the mass and the system pressure of the gas filled in the standard chamber, and calculating the volume of a free space in the system;
(5) controlling the temperature in the sample chamber to a specified temperature through a temperature control device, keeping the closing state of a switch valve and a control valve of an exhaust pipe, opening a valve of a gas tank, filling a certain amount of gas into the sample chamber until the pressure of a pressure sensor in the sample chamber is stable and reaches the standard indoor pressure in the step (4), collecting and recording data of a high-precision pressure gauge and a high-precision flow meter at the gas inlet end of the sample chamber, obtaining the mass and the system pressure of the filled gas, knowing the volume of the gas adsorbed by the sample under the pressure, and simultaneously collecting deformation measurement data of an extensometer, and knowing strain data of the gas adsorbed by the coal sample under the pressure;
(6) keeping the temperature unchanged, sequentially increasing the experimental pressure in the step (4), respectively filling gas into the standard chamber and the sample chamber, and measuring an isothermal adsorption curve of the gas in the coal sample and adsorption strain data of the coal sample under different pressures;
(7) after the isothermal adsorption experiment is repeated until the highest designed experiment pressure value is reached, performing a desorption experiment process, closing a valve of a gas tank, adjusting a booster pump, gradually increasing the pressure of the booster pump, enabling the gas to enter a standard chamber volumetric flask and a sample chamber volumetric flask when the pressure of the booster pump is greater than the pressure in the system, automatically collecting the volume of the gas through an automatic liquid level tracker, and obtaining strain data of a coal sample during gas desorption through deformation data of a extensometer;
(8) the booster pump is gradually adjusted, so that the desorption amount, the desorption rate and the strain data of the coal body sample desorbed gas under different pressures can be obtained.
Compared with the prior art, the invention has the beneficial effects that:
(1) the method adopts the comparison between a standard chamber and a sample chamber, adopts a high-precision flowmeter and a high-precision pressure gauge to accurately acquire data when a coal sample adsorbs gas, adopts a gas drainage method combined with an automatic liquid level tracker to acquire data when the coal sample desorbs the gas, and simultaneously, a control center automatically acquires strain data of the coal body, which is reacted by an extensometer, during adsorption and desorption by sleeving a heat-shrinkable pipe sleeve with the extensometer on the outer part of the coal sample, thereby realizing full-automatic operation and high accuracy of experimental data;
(2) the temperature control device is added in the temperature control device, so that the test can be controlled to be carried out under the specified high-temperature or low-temperature condition, the stability of the temperature is ensured, and the test range is enlarged.
Drawings
FIG. 1 is a schematic diagram of a preferred embodiment of a coal adsorbed gas and strain test system of the present invention;
in the figure, 1-standard chamber, 2-sample chamber, 3-gas tank, 41-vacuum pump, 42-nitrogen tank, 5-booster pump, 6-standard chamber gas collecting tank, 7-standard chamber volumetric flask, 8-sample chamber gas collecting tank, 9-sample chamber volumetric flask, 10-temperature control device and 11-pressure sensor.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Please refer to fig. 1, which is a schematic structural diagram of a preferred embodiment of a coal-based gas adsorption and strain test system of the present invention, the coal-based gas adsorption and strain test system includes a standard chamber 1, a sample chamber 2, a gas tank 3, a nitrogen tank 42, a vacuum pump 41, a booster pump 5, a standard chamber gas collecting tank 6, a sample chamber gas collecting tank 8, a standard chamber volumetric flask 7, a sample chamber volumetric flask 9 and a control center, wherein the gas tank 3 and the vacuum pump 41 are connected to the standard chamber 1 and the sample chamber 2 through an air inlet pipe and a control valve in sequence, the standard chamber 1 is connected to the standard chamber gas collecting tank 6 through an air outlet pipe and a switch valve, the standard chamber 1 is connected to the standard chamber volumetric flask 7 through an air outlet pipe and a control valve, a heat-shrinkable sleeve is further sleeved outside the sample in the sample chamber 2, a extensometer is disposed on the heat-shrinkable sleeve, and the, The ooff valve is connected with sample room gas collection tank 8, sample room 2 is connected with sample room volumetric flask 9 through blast pipe, control valve, booster pump 5 is connected with standard room 1, sample room 2 respectively through the booster pump valve, standard room 1 with all be equipped with temperature control device 10 and pressure sensor 11 in the sample room 2, standard volumetric flask 7 with sample volumetric flask 9 still is equipped with automatic liquid level tracker, control center is connected with gas pitcher 3, vacuum pump 41, nitrogen gas jar 42, control valve, booster pump valve, ooff valve, automatic liquid level tracker, temperature control device 10, pressure sensor 11 respectively.
In the embodiment, the air inlet end of the standard chamber 1 is also provided with a high-precision pressure gauge and a high-precision flow meter.
In this embodiment, the inlet end of the sample chamber 2 is also provided with a high-precision pressure gauge and a high-precision flow meter.
In this embodiment, the temperature control device 10 includes a temperature sensor, a heating pipe, and a cooling pipe, and the temperature sensor, the heating pipe, and the cooling pipe are respectively connected to the control center.
In this embodiment, the sample in the sample chamber 2 is further externally sleeved with a heat-shrinkable tube sleeve, and two ends of the heat-shrinkable tube sleeve are fixed by metal hoops.
In this embodiment, an extensometer is arranged on the heat shrinkable tube sleeve, and is connected with a control center, and the measurement and control range of the extensometer is 0-15mm in the axial direction and 0-7mm in the radial direction.
In the embodiment, the measuring resolution of the extensometer is 0.5 μm in the axial direction and 0.2 μm in the radial direction, and the deformation measuring precision of the extensometer is less than or equal to +/-0.5%.
In this example, the sample and the shrink-wrap sleeve were sealed with a sealant of Kafft and the two ends of the shrink-wrap sleeve were reinforced with ferrules.
In this embodiment, the liquid in the standard cell volumetric flask 7 and the sample cell volumetric flask 9 is grease which does not dissolve gas.
In this embodiment, the operation steps of the coal body adsorbing the gas and the strain testing system are as follows:
(1) putting a sample into a sample chamber, closing the sample chamber, preparing a vitreous standard part with the same specification as the sample, putting the standard part into a standard chamber, and closing the standard chamber;
(2) closing an exhaust pipe, a vacuum pump and a booster pump, opening a valve of a nitrogen tank, closing the valve of the nitrogen tank after a certain amount of nitrogen is introduced, recording the pressure change in a standard chamber and a sample chamber every 0.5h after the data of a pressure sensor is stable, if the pressure sensor does not change obviously within 3h, indicating that the air tightness is good, and if the pressure sensor changes obviously, indicating that the air tightness is poor, rechecking and assembling the test device;
(3) if the air tightness is good, opening a vacuum pump valve, degassing the standard part and the sample to eliminate the influence of excessive nitrogen adsorption on the test result of the standard part and the sample, wherein the degassing time is 1-3h, and closing the vacuum pump valve until the pressure sensor has no obvious change;
(4) controlling the temperature in the standard chamber to a specified temperature through a temperature control device, keeping the closing state of a switch valve and a control valve of an exhaust pipe, opening a valve of a gas tank, filling a certain amount of gas into the standard chamber until the pressure of a pressure sensor in the standard chamber reaches the experimental design pressure, collecting and recording data of a high-precision pressure gauge and a high-precision flow meter at the gas inlet end of the standard chamber, obtaining the mass and the system pressure of the gas filled in the standard chamber, and calculating the volume of a free space in the system;
(5) controlling the temperature in the sample chamber to a specified temperature through a temperature control device, keeping the closing state of a switch valve and a control valve of an exhaust pipe, opening a valve of a gas tank, filling a certain amount of gas into the sample chamber until the pressure of a pressure sensor in the sample chamber is stable and reaches the standard indoor pressure in the step (4), collecting and recording data of a high-precision pressure gauge and a high-precision flow meter at the gas inlet end of the sample chamber, obtaining the mass and the system pressure of the filled gas, knowing the volume of the gas adsorbed by the sample under the pressure, and simultaneously collecting deformation measurement data of an extensometer, and knowing strain data of the gas adsorbed by the coal sample under the pressure;
(6) keeping the temperature unchanged, sequentially increasing the experimental pressure in the step (4), respectively filling gas into the standard chamber and the sample chamber, and measuring an isothermal adsorption curve of the gas in the coal sample and adsorption strain data of the coal sample under different pressures;
(7) after the isothermal adsorption experiment is repeated until the highest designed experiment pressure value is reached, performing a desorption experiment process, closing a valve of a gas tank, adjusting a booster pump, gradually increasing the pressure of the booster pump, enabling the gas to enter a standard chamber volumetric flask and a sample chamber volumetric flask when the pressure of the booster pump is greater than the pressure in the system, automatically collecting the volume of the gas through an automatic liquid level tracker, and obtaining strain data of a coal sample during gas desorption through deformation data of a extensometer;
(8) the booster pump is gradually adjusted, so that the desorption amount, the desorption rate and the strain data of the coal body sample desorbed gas under different pressures can be obtained.
The method adopts the comparison between a standard chamber and a sample chamber, adopts a high-precision flowmeter and a high-precision pressure gauge to accurately acquire data when a coal sample adsorbs gas, adopts a gas drainage method combined with an automatic liquid level tracker to acquire data when the coal sample desorbs the gas, and simultaneously, a control center automatically acquires strain data of the coal body, which is reacted by an extensometer, during adsorption and desorption by sleeving a heat-shrinkable pipe sleeve with the extensometer on the outer part of the coal sample, thereby realizing full-automatic operation and high accuracy of experimental data; the temperature control device is added in the temperature control device, so that the test can be controlled to be carried out under the specified high-temperature or low-temperature condition, the stability of the temperature is ensured, and the test range is enlarged.
While the foregoing description shows and describes the preferred embodiments of the present invention, it is to be understood that the invention is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as described herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides a coal body adsorbs gas and strain test system, its characterized in that, includes standard chamber (1), sample room (2), gas pitcher (3), nitrogen gas jar (42), vacuum pump (41), booster pump (5), standard chamber gas collection tank (6), sample room gas collection tank (8), standard chamber volumetric flask (7), sample room volumetric flask (9) and control center, gas pitcher (3), vacuum pump (41) loop through intake pipe, control valve and are connected with standard chamber (1), sample room (2), standard chamber (1) is connected with standard chamber gas collection tank (6) through blast pipe, ooff valve, standard chamber (1) is connected with standard chamber volumetric flask (7) through blast pipe, control valve, the sample outside in sample room (2) still overlaps and has the pyrocondensation pipe sleeve, the pyrocondensation pipe is sheathe in and is equipped with the extensometer, sample room (2) are through blast pipe, gas pitcher (7), The ooff valve is connected with sample room gas collection tank (8), sample room (2) are connected with sample room volumetric flask (9) through blast pipe, control valve, booster pump (5) are connected with standard room (1), sample room (2) respectively through the booster pump valve, standard room (1) with all be equipped with temperature control device (10) and pressure sensor (11) in sample room (2), standard volumetric flask (7) with sample volumetric flask (9) still are equipped with automatic liquid level tracker, control center is connected with gas cylinder (3), vacuum pump (41), nitrogen gas jar (42), control valve, booster pump valve, ooff valve, automatic liquid level tracker, temperature control device (10), pressure sensor (11) respectively.
2. The system for testing gas adsorption and strain of a coal body according to claim 1, wherein: and the air inlet end of the standard chamber (1) is also provided with a high-precision pressure gauge and a high-precision flow meter.
3. The system for testing gas adsorption and strain of a coal body according to claim 1, wherein: and the air inlet end of the sample chamber (2) is also provided with a high-precision pressure gauge and a high-precision flowmeter.
4. The system for testing gas adsorption and strain of a coal body according to claim 1, wherein: the temperature control device (10) comprises a temperature sensor, a heating pipe and a cooling pipe, wherein the temperature sensor, the heating pipe and the cooling pipe are respectively connected with a control center.
5. The system for testing gas adsorption and strain of a coal body according to claim 1, wherein: and a heat-shrinkable pipe sleeve is sleeved outside the sample in the sample chamber (2), and two ends of the heat-shrinkable pipe sleeve are fixed by metal hoops.
6. The system for testing gas adsorption and strain of a coal body according to claim 5, wherein: the heat-shrinkable tube sleeve is provided with an extensometer, the extensometer is connected with a control center, and the measurement and control range of the extensometer is 0-15mm in the axial direction and 0-7mm in the radial direction.
7. The system for testing gas adsorption and strain of the coal body according to claim 6, wherein: the measuring resolution of the extensometer is 0.5 μm in the axial direction and 0.2 μm in the radial direction, and the deformation measuring precision of the extensometer is less than or equal to +/-0.5%.
8. The system for testing gas adsorption and strain of the coal body according to claim 6, wherein: and sealing the sample and the heat-shrinkable tube sleeve by using Kafft sealant, and reinforcing two ends of the heat-shrinkable tube sleeve by using metal hoops.
9. The system for testing gas adsorption and strain of a coal body according to claim 1, wherein: the liquid in the standard chamber volumetric flask (7) and the sample chamber volumetric flask (9) is grease which does not dissolve gas.
10. The system for testing gas adsorption and strain of a coal body according to claim 1, wherein the system for testing gas adsorption and strain of a coal body is operated by the following steps:
(1) putting a sample into a sample chamber, closing the sample chamber, preparing a vitreous standard part with the same specification as the sample, putting the standard part into a standard chamber, and closing the standard chamber;
(2) closing an exhaust pipe, a vacuum pump and a booster pump, opening a valve of a nitrogen tank, closing the valve of the nitrogen tank after a certain amount of nitrogen is introduced, recording the pressure change in a standard chamber and a sample chamber every 0.5h after the data of a pressure sensor is stable, if the pressure sensor does not change obviously within 3h, indicating that the air tightness is good, and if the pressure sensor changes obviously, indicating that the air tightness is poor, rechecking and assembling the test device;
(3) if the air tightness is good, opening a vacuum pump valve, degassing the standard part and the sample to eliminate the influence of excessive nitrogen adsorption on the test result of the standard part and the sample, wherein the degassing time is 1-3h, and closing the vacuum pump valve until the pressure sensor has no obvious change;
(4) controlling the temperature in the standard chamber to a specified temperature through a temperature control device, keeping the closing state of a switch valve and a control valve of an exhaust pipe, opening a valve of a gas tank, filling a certain amount of gas into the standard chamber until the pressure of a pressure sensor in the standard chamber reaches the experimental design pressure, collecting and recording data of a high-precision pressure gauge and a high-precision flow meter at the gas inlet end of the standard chamber, obtaining the mass and the system pressure of the gas filled in the standard chamber, and calculating the volume of a free space in the system;
(5) controlling the temperature in the sample chamber to a specified temperature through a temperature control device, keeping the closing state of a switch valve and a control valve of an exhaust pipe, opening a valve of a gas tank, filling a certain amount of gas into the sample chamber until the pressure of a pressure sensor in the sample chamber is stable and reaches the standard indoor pressure in the step (4), collecting and recording data of a high-precision pressure gauge and a high-precision flow meter at the gas inlet end of the sample chamber, obtaining the mass and the system pressure of the filled gas, knowing the volume of the gas adsorbed by the sample under the pressure, and simultaneously collecting deformation measurement data of an extensometer, and knowing strain data of the gas adsorbed by the coal sample under the pressure;
(6) keeping the temperature unchanged, sequentially increasing the experimental pressure in the step (4), respectively filling gas into the standard chamber and the sample chamber, and measuring an isothermal adsorption curve of the gas in the coal sample and adsorption strain data of the coal sample under different pressures;
(7) after the isothermal adsorption experiment is repeated until the highest designed experiment pressure value is reached, performing a desorption experiment process, closing a valve of a gas tank, adjusting a booster pump, gradually increasing the pressure of the booster pump, enabling the gas to enter a standard chamber volumetric flask and a sample chamber volumetric flask when the pressure of the booster pump is greater than the pressure in the system, automatically collecting the volume of the gas through an automatic liquid level tracker, and obtaining strain data of a coal sample during gas desorption through deformation data of a extensometer;
(8) the booster pump is gradually adjusted, so that the desorption amount, the desorption rate and the strain data of the coal body sample desorbed gas under different pressures can be obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911262885.1A CN111521516A (en) | 2019-12-11 | 2019-12-11 | Coal body gas adsorption and strain test system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911262885.1A CN111521516A (en) | 2019-12-11 | 2019-12-11 | Coal body gas adsorption and strain test system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
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| CN111964640A (en) * | 2020-08-15 | 2020-11-20 | 海南海玻工程玻璃有限公司 | Glass detection device |
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| CN113588489A (en) * | 2021-08-16 | 2021-11-02 | 西安石油大学 | Shale gas capacity method isothermal adsorption experiment test limit determination method |
| CN113834753A (en) * | 2021-09-18 | 2021-12-24 | 华北科技学院(中国煤矿安全技术培训中心) | Isothermal adsorption-desorption system under coal sample vibration condition |
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