CN112432879A - Gas adsorption-desorption-recovery test device for coal body and test method thereof - Google Patents
Gas adsorption-desorption-recovery test device for coal body and test method thereof Download PDFInfo
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- CN112432879A CN112432879A CN202010990235.5A CN202010990235A CN112432879A CN 112432879 A CN112432879 A CN 112432879A CN 202010990235 A CN202010990235 A CN 202010990235A CN 112432879 A CN112432879 A CN 112432879A
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Abstract
The invention discloses a coal gas adsorption-desorption-recovery test device and a test method thereof, wherein the test device comprises a main pipeline, a high-pressure helium bottle, a high-pressure methane bottle, a metering tank, a coal sample tank, a vacuum pump, a mass flow meter and a desorption system which can exhaust gas at constant pressure and recycle, wherein the high-pressure helium bottle, the high-pressure methane bottle, the metering tank, the coal sample tank, the vacuum pump, the mass flow meter and the desorption system are sequentially connected to the main pipeline, and a plurality of valves are arranged; an air supply valve, a regulating valve and an exhaust valve are sequentially arranged on the main pipeline from upstream to downstream; the testing method comprises the steps of obtaining the true density of the coal body, obtaining a gas isothermal adsorption curve of the coal body, obtaining a gas isothermal desorption curve of the coal body, obtaining a gas desorption curve of the coal body, recovering tail gas and the like. The invention not only can fully test the characteristics between the coal sample and the gas in various aspects, but also realizes the technical breakthroughs of convenient control, constant-pressure exhaust, cyclic utilization, high test precision, high safety and the like, and has great significance for national and public benefits.
Description
Technical Field
The invention relates to coal mine safety and laboratory safety, in particular to a coal gas adsorption-desorption-recovery test device and a test method thereof.
Background
The gas adsorption and desorption characteristics of coal bodies are the main basis for predicting outburst risks of coal and gas, research on the gas adsorption and desorption characteristics of coal bodies is gradually increased, gas desorption data are obtained by generally adopting a drainage method, the pressure generated by the height of a liquid column in a measuring cylinder often influences the gas desorption of coal particles, and the height of the liquid column is continuously reduced in the desorption process, so that the influence on the gas desorption is different, the external air pressure of the gas desorption is continuously changed, and the precision of the desorption data is reduced.
In addition, the methane gas is a flammable and explosive gas, potential safety hazards are often caused when a large number of methane tests are carried out in a laboratory and collection is not carried out, and the collected methane gas can be reused, so that the material cost is saved.
Finally, the height of the conical flask is usually adjusted by a tester manually to adjust the liquid level in the measuring cylinder, the stability of the adjusting process of the scheme is poor, and the conical flask is difficult to fix at a specific height, so that the operation convenience of the test is influenced, and the test efficiency and precision are reduced.
Disclosure of Invention
The invention aims to solve the technical problem of providing a coal gas adsorption-desorption-recovery test device and a test method thereof, which not only can fully test the characteristics between a coal sample and gas in various aspects, but also realizes the technical breakthroughs of convenient control, constant pressure exhaust, cyclic utilization, high test precision, high safety and the like, and has great significance to national and public benefits.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: the gas adsorption-desorption-recovery test device for the coal comprises a main pipeline, wherein an air supply valve, a regulating valve and an exhaust valve are sequentially arranged on the main pipeline from the upstream to the downstream; the upper part of the gas supply valve on the main pipeline is connected with a high-pressure helium bottle and a high-pressure methane bottle through a first pressure reducing valve and a second pressure reducing valve respectively; a metering tank is connected between the air supply valve and the regulating valve on the main pipeline through a valve I, a vacuum pump and a coal sample tank are respectively connected between the regulating valve and the exhaust valve on the main pipeline through a valve II and a valve III, the metering tank and the coal sample tank are placed in a constant temperature water bath box, the metering tank, the coal sample tank and the vacuum pump are respectively provided with a pressure gauge I, manometer II and manometer III, be provided with mass flowmeter in the low reaches of exhaust valve on the trunk line, the trailing end connection tail pipe of trunk line, the tail end of tail pipe immerses in the graduated flask that is equipped with water and closed, the graduated flask bottom is connected with the liquid level control container through the intercommunication hose, the top intercommunication of graduated flask is provided with the gasbag, valve IV is joined in marriage to the gasbag, the zero scale of graduated flask is located the lateral wall top of graduated flask, still be provided with the constant voltage exhaust apparatus with the trailing end connection of tail pipe in the graduated flask, constant voltage exhaust apparatus includes that kickboard and both ends solidify the connecting rod at the kickboard lower surface and the tail end of tail pipe respectively.
Preferably, the liquid level control container is connected with the crane, and the crane includes the base, sets up electric telescopic handle on the base and connects the clip on electric telescopic handle top perpendicularly, and the liquid level control container is realized fixedly by the clip centre gripping.
Preferably, the outside of the air bag is provided with a protective cover, the inner wall of the protective cover is provided with a pressure sensor, and the pressure sensor is connected with a buzzer.
Preferably, the protective cover is formed by splicing two semi-ellipsoidal half shells, the rear ends of the two half shells are hinged together, the front ends of the two half shells are connected through two buckles after being cut, and the cut parts form an opening of the protective cover.
Preferably, the surface of the protective cover is hollowed to form a small hole for conveniently observing the state of an internal air bag of the protective cover.
The testing method of the gas adsorption-desorption-recovery testing device for the coal body comprises the following steps:
s1, acquiring the true density of the coal body;
s2, obtaining a gas isothermal adsorption curve of the coal body;
s3, obtaining a gas isothermal desorption curve of the coal body;
s4, acquiring a gas desorption curve of the coal body;
s5, tail gas recovery: closing the first pressure reducing valve, the second pressure reducing valve, the air supply valve, the regulating valve, the exhaust valve, the valve I, the valve II and the valve III, only opening the valve IV, adjusting the height of the liquid level regulating container to enable the liquid level in the measuring cylinder to be located at the position of 0mL, so that the air at the top of the measuring cylinder is transferred into the air bag, and closing the valve IV; the gas collected in the air bag can be recycled, and is prevented from being discharged indoors to cause danger.
Preferably, the specific operation method of step S1 is:
s1-1, weighing the coal sample and then putting the coal sample into a coal sample tank;
s1-2, checking the air tightness of the metering tank and the coal sample tank: closing a valve II and an exhaust valve, opening an air supply valve, a valve I, a regulating valve, a valve III and a first pressure reducing valve, closing the air supply valve, the valve I, the regulating valve and the first pressure reducing valve after the pressure values of the pressure gauge I and the pressure gauge II are displayed to be 5-7MPa, observing the pressure values of the pressure gauge I and the pressure gauge II, checking the air tightness of the metering tank and the coal sample tank, opening the valve I, the regulating valve, the valve III, the exhaust valve and the valve IV after determining that the metering tank and the coal sample tank are airtight, and discharging helium in the metering tank and the coal sample tank;
s1-3, vacuumizing: closing an exhaust valve and a valve IV, opening a valve I, a regulating valve, a valve II and a valve III, starting a vacuum pump to pump air, considering that the metering tank and the coal sample tank are in a vacuum state after absolute pressure values of a pressure gauge I and a pressure gauge II are displayed below 4Pa, and closing the regulating valve, the valve II and the valve III to keep the vacuum state of the metering tank and the coal sample tank;
s1-4, opening a first pressure reducing valve and an air supply valve, filling helium into a metering tank, closing the first pressure reducing valve, the air supply valve and a valve I, calculating the helium amount in the metering tank through the reading of a pressure gauge I and the volume of the metering tank, opening the valve I, a regulating valve and a valve III, calculating the total space volume occupied by the helium through the total amount of the original helium and the helium pressure at the current stage after the helium is balanced between the metering tank and a coal sample tank, subtracting the total space volume from the sum of the volumes of the metering tank and the coal sample tank to obtain the true volume of the coal sample, and dividing the mass of the coal sample by the true volume of the coal sample to obtain the true density of the coal sample.
Preferably, the specific operation method of step S2 is:
s2-1, checking the air tightness of the metering tank and the coal sample tank, and calculating the total space volume after subtracting the true volume of the coal sample;
s2-2, after vacuumizing, closing all pressure reducing valves and valves;
s2-3, opening a second pressure reducing valve, an air supply valve and a valve I, filling gas into a metering tank, closing the second pressure reducing valve, the air supply valve and the valve I, calculating the gas quantity through the reading of a pressure gauge I and the volume of the metering tank, then keeping the second pressure reducing valve and the air supply valve closed, opening the valve I, a regulating valve and a valve III, after 12 hours, waiting for the pressure gauge I and the pressure gauge II to be stable and display the same pressure value, recording the pressure value, calculating the residual gas quantity after adsorption through the pressure value and the total space volume, and then obtaining the gas quantity adsorbed by the coal sample; then recording the pressure value and the gas amount absorbed by the coal sample once every 12 hours, and recording 5-10 periods;
and S2-4, drawing a curve of the gas quantity adsorbed in a constant temperature state relative to the adsorption equilibrium pressure, namely the gas isothermal adsorption curve of the coal sample.
Preferably, the specific operation method of step S3 is:
s3-1, after the coal sample fully adsorbs gas, closing the regulating valve and the valve III, and recording the pressure value displayed by the pressure gauge II at the moment;
s3-2, opening a valve IV, adjusting the height of the liquid level adjusting container to enable the liquid level in the measuring cylinder to be 0mL, and transferring the gas at the top of the measuring cylinder into an air bag;
s3-3, closing a valve IV, opening an exhaust valve, then slowly opening a valve III, rapidly closing the valve III when the gauge pressure is reduced by 0.5-1 MPa and the desorption gas collected in the measuring cylinder does not exceed the range, displaying a pressure value record after the reading of a pressure gauge II is constant, then adjusting the height of the liquid level adjusting container again to enable the liquid level height of the measuring cylinder to be level with the liquid level height of the liquid level adjusting container, recording the liquid level height in the measuring cylinder at the moment to be the free volume of the desorption gas, wherein the free volume is the desorption amount between the two pressure values;
s3-4, repeating the steps S3-2 and S3-3 until no desorption gas is discharged;
and S3-5, drawing a desorption amount-pressure curve, namely the isothermal desorption curve of the gas of the coal sample.
Preferably, the specific operation method of step S4 is:
s4-1, after the coal sample fully adsorbs gas, closing a regulating valve and a valve III;
s4-2, opening a valve IV, adjusting the height of the liquid level adjusting container to enable the liquid level in the measuring cylinder to be 0mL, and transferring the gas at the top of the measuring cylinder into an air bag;
s4-3, closing the valve IV, opening the exhaust valve and the valve III, starting timing simultaneously, adjusting the liquid level adjusting container in real time to enable the liquid level height of the measuring cylinder to be flush with the liquid level height of the liquid level adjusting container, and recording the gas volume at the top of the measuring cylinder and the corresponding time; in addition, the mass flowmeter is connected with the computer, and the gas quantity passing through the mass flowmeter and the corresponding time data can be transmitted to the computer; and averaging the gas desorption data detected by the measuring cylinder and the mass flowmeter, and then drawing a curve of the gas desorption amount of the coal sample relative to time, namely the gas desorption curve of the coal sample.
Step S4 may operate after step S2 or step S3.
And a backflow preventing device is arranged between the mass flow meter and the measuring cylinder, so that water in the measuring cylinder can be prevented from flowing backwards to the mass flow meter.
The backflow prevention device adopts a one-way valve.
The backflow prevention device can also adopt a sealed transparent container, and a main pipeline in the sealed transparent container is disconnected.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: the invention not only can fully test the true density of the coal sample, the gas adsorption, desorption and recovery of the coal sample in many aspects, but also realizes the technical breakthrough of convenient control, constant pressure exhaust, cyclic utilization, high test precision, high safety and the like by technical means of a constant pressure exhaust device, an air bag for recovering gas, electric linear regulation of the height of a liquid level regulation container and the like, and has great significance to the national and public benefits.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is an enlarged view of a portion of the protective cover of the present invention.
Fig. 3 is a partially enlarged view of a constant pressure venting means in the measuring cylinder of the present invention.
FIG. 4 is a diagram of the connection of the mass flow meter, the measuring cylinder and the backflow prevention device of the present invention.
In the figure: 1. the device comprises a main pipeline 2, an air supply valve 3, a regulating valve 4, an exhaust valve 5, a first pressure reducing valve 6, a high-pressure helium bottle 7, a second pressure reducing valve 8, a high-pressure methane bottle 9, a valve I10, a metering tank 11, a valve III 12, a coal sample tank 13, a valve II 14, a vacuum pump 15, a constant-temperature water bath tank 16, a pressure gauge I17, a pressure gauge II 18, a pressure gauge III 19, a mass flowmeter 20, an exhaust hose 21, a metering cylinder 22, a liquid level regulating container 23, an air bag 24, a valve IV 25, a base 26, an electric telescopic rod 27, a clamp 28, a protective cover 29, a half shell 30, a hasp 31, an opening 32, a small hole 33, a floating plate 34, a connecting rod 34.
Detailed Description
Referring to the attached drawings 1-3, the coal gas adsorption-desorption-recovery test device comprises a main pipeline 1, wherein an air supply valve 2, a regulating valve 3 and an exhaust valve 4 are sequentially arranged on the main pipeline 1 from upstream to downstream; a high-pressure helium bottle 6 and a high-pressure methane bottle 8 are respectively connected to the upstream of the air supply valve 2 on the main pipeline 1 through a first pressure reducing valve 5 and a second pressure reducing valve 7; a metering tank 10 is connected to the position between the air supply valve 2 and the regulating valve 3 on the main pipeline 1 through a valve I9, a vacuum pump 14 and a coal sample tank 12 are respectively connected to the position between the regulating valve 3 and the exhaust valve 4 on the main pipeline 1 through a valve II 13 and a valve III 11, the metering tank 10 and the coal sample tank 12 are placed into a constant temperature water bath box 15, the metering tank 10, the coal sample tank 12 and the vacuum pump 14 are respectively provided with a pressure gauge I16, the measuring cylinder comprises a pressure gauge II 17 and a pressure gauge III 18, a mass flowmeter 19 is arranged on the main pipe 1 at the downstream of an exhaust valve 4, the tail end of the main pipe 1 is connected with an exhaust tail pipe 20, the tail end of the exhaust tail pipe 20 is immersed into a closed measuring cylinder 21 filled with water, the bottom of the measuring cylinder 21 is connected with a liquid level regulating container 22 through a communication hose 35, the top of the measuring cylinder 21 is communicated with an air bag 23, the air bag 23 is provided with a valve IV 24, and zero scales of the measuring cylinder 21 are located at the top of the side wall of the measuring.
Referring to fig. 3, a constant pressure exhaust device connected to the tail end of the tail pipe 20 is further disposed in the measuring cylinder 21, and the constant pressure exhaust device includes a floating plate 33 and a connecting rod 34 having two ends respectively fixed to the lower surface of the floating plate 33 and the tail end of the tail pipe 20. The floating plate 33 always floats on the water surface, and the length of the connecting rod 34 is fixed, so that the height of the port of the tail pipe 20 from the water surface is fixed, the water pressure at the port of the tail pipe 20 is constant, the unstable condition caused by the change of the exhaust gas under the water pressure is avoided, and the test error is also reduced.
Referring back to fig. 1, the liquid level adjusting container 22 is connected with a lifting frame, the lifting frame comprises a base 25, an electric telescopic rod 26 vertically arranged on the base 25 and a clamp 27 connected to the top end of the electric telescopic rod 26, and the liquid level adjusting container 25 is clamped and fixed by the clamp 27. The electric telescopic rod 26 can be extended or shortened electrically and linearly, so that the height change of the liquid level adjusting container 22 on the clamp 27 is controlled, and the convenience, controllability and stability of the test are improved.
Referring to fig. 2 alone, a protective cover 28 is arranged outside the airbag 23, and a pressure sensor is arranged on the inner wall of the protective cover 28 and connected with a buzzer. When the gas recovered by the gas bag 23 reaches the upper limit, the gas bag 23 compresses the pressure sensor, the pressure sensor detects that the pressure value reaches the upper limit, the buzzer is controlled to give out a danger alarm, and a tester is informed to stop recovering the gas into the gas bag 23 immediately, or the gas in the gas bag is transferred and recovered.
The protective cover 28 is formed by splicing two semi-ellipsoidal half shells 29, the rear ends of the two half shells 29 are hinged together, the front ends of the two half shells 29 are connected through two buckles 30 after being cut, and the cut parts form an opening 31 of the protective cover 28. The buckle 30 can open the protective cover 28, and gas recovered in the airbag 23 can be easily transferred.
The surface of the protective cover 28 is hollowed to form a small hole for conveniently observing the state of the air bag 23 inside the protective cover.
The testing method of the gas adsorption-desorption-recovery testing device for the coal body comprises the following steps:
s1, obtaining the true volume and the true density of the coal body, wherein the specific operation method comprises the following steps:
s1-1, weighing the coal sample and then putting the coal sample into a coal sample tank 12;
s1-2, checking the air tightness of the measuring tank 10 and the coal sample tank 12: closing a valve II 13 and an exhaust valve 4, opening an air supply valve 2, a valve I9, a regulating valve 3, a valve III 11 and a first pressure reducing valve 5, closing the air supply valve 2, the valve I9, the regulating valve 3 and the first pressure reducing valve 5 after the pressure values of a pressure gauge I16 and a pressure gauge II 17 are displayed to be 5-7MPa, observing the pressure values of the pressure gauge I16 and the pressure gauge II 17, checking the air tightness of the metering tank 10 and the coal sample tank 12, opening the valve I9, the regulating valve 3, the valve III 11, the exhaust valve 4 and a valve IV 24 after determining that the metering tank 10 and the coal sample tank 12 are airtight, and discharging helium gas in the metering tank 10 and the coal sample tank 12;
s1-3, vacuumizing: closing an exhaust valve 4 and a valve IV 24, opening a valve I9, a regulating valve 3, a valve II 13 and a valve III 11, starting a vacuum pump 14 to pump air, and after absolute pressure values of a pressure gauge I16 and a pressure gauge II 17 are displayed below 4Pa, considering that the measuring tank 10 and the coal sample tank 12 are in a vacuum state, and closing the regulating valve 3, the valve II 13 and the valve III 11 to keep the vacuum state inside the measuring tank 10 and the coal sample tank 12;
s1-4, opening the first pressure reducing valve 5 and the air supply valve 2, filling helium into the metering tank 10, closing the first pressure reducing valve 5, the air supply valve 2 and the valve I9, calculating the helium amount in the metering tank 10 through the reading of the pressure gauge I16 and the volume of the metering tank 10, opening the valve I9, the regulating valve 3 and the valve III 11, after the helium is balanced between the metering tank 10 and the coal sample tank 12, calculating the total space volume occupied by the helium through the total helium amount and the helium pressure in the current stage, subtracting the total space volume from the sum of the volumes of the metering tank 10 and the coal sample tank 12 to obtain the true volume of the coal sample, and dividing the mass of the coal sample by the true volume of the coal sample to obtain the true density of the coal sample.
S2, obtaining a gas isothermal adsorption curve of the coal body, wherein the specific operation method comprises the following steps:
s2-1, checking the air tightness 12 of the metering tank 10 and the coal sample tank, and calculating the total space volume after subtracting the true volume of the coal sample;
s2-2, after vacuumizing, closing all pressure reducing valves and valves;
s2-3, opening a second pressure reducing valve 7, an air supply valve 2 and a valve I9, filling gas into a metering tank 10, closing the second pressure reducing valve 7, the air supply valve 2 and the valve I9, calculating the gas quantity through the reading of a pressure gauge I16 and the volume of the metering tank 10, then keeping the second pressure reducing valve 7 and the air supply valve 2 closed, opening the valve I9, a regulating valve 3 and a valve III 11, recording the pressure value after the pressure gauge I16 and the pressure gauge II 17 are stable and display the same pressure value after 12 hours, calculating the residual gas quantity after adsorption through the pressure value and the total space volume, and then obtaining the gas quantity adsorbed by the coal sample; then recording the pressure value and the gas amount absorbed by the coal sample once every 12 hours, and recording 10 periods;
and S2-4, drawing a curve of the gas quantity adsorbed in a constant temperature state relative to the adsorption equilibrium pressure, namely the gas isothermal adsorption curve of the coal sample.
S3, obtaining a gas isothermal desorption curve of the coal body, wherein the specific operation method comprises the following steps:
s3-1, after the coal sample fully adsorbs gas, closing the regulating valve 3 and the valve III 11, and recording the pressure value displayed by the pressure gauge II 17 at the moment;
s3-2, opening a valve IV 24, adjusting the height of the liquid level adjusting container 22 to enable the liquid level in the measuring cylinder 21 to be 0mL, and transferring the gas at the top of the measuring cylinder 21 into the air bag 23;
s3-3, closing a valve IV 24, opening an exhaust valve 4, then slowly opening a valve III 11, when the gauge pressure is reduced by 0.5-1 MPa and the desorption gas collected in the measuring cylinder 21 does not exceed the range, quickly closing the valve III 11, when the reading of a pressure gauge II 17 is constant, displaying the pressure value for recording, then adjusting the height of the liquid level adjusting container 22 again to enable the liquid level height of the measuring cylinder 21 to be flush with the liquid level height of the liquid level adjusting container 22, and recording the liquid level height in the measuring cylinder 21 at the moment to be the free volume of the desorption gas, wherein the free volume is the desorption amount between the two pressure values;
s3-4, repeating the steps S3-2 and S3-3 until no desorption gas is discharged;
and S3-5, drawing a desorption amount-pressure curve, namely the isothermal desorption curve of the gas of the coal sample.
S4, obtaining a gas desorption curve of the coal body, wherein the specific operation method comprises the following steps:
s4-1, after the coal sample fully adsorbs gas, closing the regulating valve 3 and the valve III 11;
s4-2, opening a valve IV 24, adjusting the height of the liquid level adjusting container 22 to enable the liquid level in the measuring cylinder 21 to be 0mL, and transferring the gas at the top of the measuring cylinder 21 into the air bag 23;
s4-3, closing the valve IV 24, opening the exhaust valve 4 and the valve III 11, simultaneously starting timing, adjusting the liquid level adjusting container 22 from time to enable the liquid level height of the measuring cylinder 21 to be flush with the liquid level height of the liquid level adjusting container 22, and recording the gas volume at the top of the measuring cylinder 21 and the corresponding time; in addition, the mass flow meter 19 is connected with a computer, and the gas quantity passing through the mass flow meter 19 and the corresponding time data can be transmitted to the computer; after averaging the gas desorption data detected by the measuring cylinder 21 and the mass flow meter 19, a curve of the gas desorption amount of the coal sample with respect to time, that is, a gas desorption curve of the coal sample, is drawn.
S5, tail gas recovery: closing the first pressure reducing valve 5, the second pressure reducing valve 7, the air supply valve 2, the regulating valve 3, the exhaust valve 4, the valve I9, the valve II 13 and the valve III 11, only opening the valve IV 24, adjusting the height of the liquid level adjusting container 22 to enable the liquid level in the measuring cylinder 21 to be located at the position of 0mL, so that the gas at the top of the measuring cylinder 21 is transferred into the air bag 23, and closing the valve IV 24; the gas collected in the air bag 23 can be recycled and prevented from being discharged into a room to cause danger.
Referring to fig. 4, a backflow preventing device is arranged between the mass flowmeter 19 and the measuring cylinder 21, and can prevent water in the measuring cylinder 21 from flowing backwards to the mass flowmeter 19. The backflow prevention device adopts a sealed transparent container 34, and the main pipeline 1 inside the sealed transparent container 34 is disconnected.
The above description is only presented as an enabling solution for the present invention and should not be taken as a sole limitation on the solution itself.
Claims (10)
1. The gas adsorption-desorption-recovery test device for the coal comprises a main pipeline, wherein an air supply valve, a regulating valve and an exhaust valve are sequentially arranged on the main pipeline from the upstream to the downstream;
the upper part of the gas supply valve on the main pipeline is connected with a high-pressure helium bottle and a high-pressure methane bottle through a first pressure reducing valve and a second pressure reducing valve respectively;
position on the trunk line between air supply valve and regulation and control valve is connected with the metering tank through valve I, and position on the trunk line between regulation and control valve and exhaust valve is connected with vacuum pump and coal sample jar through valve II and valve III respectively, and constant temperature water bath case is put into to metering tank and coal sample jar, and metering tank, coal sample jar and vacuum pump set manometer I, manometer II and manometer III, its characterized in that respectively: the mass flow meter is arranged at the lower part of the exhaust valve on the main pipeline, the tail end of the main pipeline is connected with an exhaust tail pipe, the tail end of the exhaust tail pipe is immersed in a measuring cylinder which is filled with water and is closed, the bottom of the measuring cylinder is connected with a liquid level adjusting container through a communicating hose, the top of the measuring cylinder is communicated with an air bag, the air bag is provided with a valve IV, the zero scale of the measuring cylinder is positioned at the top of the side wall of the measuring cylinder, a constant pressure exhaust device which is connected with the tail end of the exhaust tail pipe is further arranged in the measuring cylinder, and the constant pressure exhaust device comprises a floating plate and a.
2. The gas adsorption-desorption-recovery test device for the coal body according to claim 1, wherein: the liquid level control container is connected with the crane, and the crane includes the base, sets up electric telescopic handle on the base and connects the clip on electric telescopic handle top perpendicularly, and the liquid level control container is realized fixedly by the clip centre gripping.
3. The gas adsorption-desorption-recovery test device for the coal body according to claim 1, wherein: the outside safety cover that sets up of gasbag, the safety cover inner wall sets up pressure sensor, and pressure sensor is connected with bee calling organ.
4. The gas adsorption-desorption-recovery test device for the coal body according to claim 3, wherein: the protective cover is formed by splicing two semi-ellipsoidal semi-shells, the rear ends of the two semi-shells are hinged together, the front ends of the two semi-shells are connected through two hasps after being cut, and the cut parts form an opening of the protective cover.
5. The gas adsorption-desorption-recovery test device for the coal body according to claim 4, wherein: the surface of the protective cover is hollowed to form a small hole for conveniently observing the state of an internal air bag of the protective cover.
6. The method for testing a gas adsorption-desorption-recovery test device for a coal body according to claim 1, wherein: the method comprises the following steps:
s1, acquiring the true density of the coal body;
s2, obtaining a gas isothermal adsorption curve of the coal body;
s3, obtaining a gas isothermal desorption curve of the coal body;
s4, acquiring a gas desorption curve of the coal body;
s5, tail gas recovery: closing the first pressure reducing valve, the second pressure reducing valve, the air supply valve, the regulating valve, the exhaust valve, the valve I, the valve II and the valve III, only opening the valve IV, adjusting the height of the liquid level regulating container to enable the liquid level in the measuring cylinder to be located at the position of 0mL, so that the air at the top of the measuring cylinder is transferred into the air bag, and closing the valve IV; the gas collected in the air bag can be recycled, and is prevented from being discharged indoors to cause danger.
7. The method for testing a gas adsorption-desorption-recovery test apparatus for a coal body according to claim 6, wherein: the specific operation method of step S1 is as follows:
s1-1, weighing the coal sample and then putting the coal sample into a coal sample tank;
s1-2, checking the air tightness of the metering tank and the coal sample tank: closing a valve II and an exhaust valve, opening an air supply valve, a valve I, a regulating valve, a valve III and a first pressure reducing valve, closing the air supply valve, the valve I, the regulating valve and the first pressure reducing valve after the pressure values of the pressure gauge I and the pressure gauge II are displayed to be 5-7MPa, observing the pressure values of the pressure gauge I and the pressure gauge II, checking the air tightness of the metering tank and the coal sample tank, opening the valve I, the regulating valve, the valve III, the exhaust valve and the valve IV after determining that the metering tank and the coal sample tank are airtight, and discharging helium in the metering tank and the coal sample tank;
s1-3, vacuumizing: closing an exhaust valve and a valve IV, opening a valve I, a regulating valve, a valve II and a valve III, starting a vacuum pump to pump air, considering that the metering tank and the coal sample tank are in a vacuum state after absolute pressure values of a pressure gauge I and a pressure gauge II are displayed below 4Pa, and closing the regulating valve, the valve II and the valve III to keep the vacuum state of the metering tank and the coal sample tank;
s1-4, opening a first pressure reducing valve and an air supply valve, filling helium into a metering tank, closing the first pressure reducing valve, the air supply valve and a valve I, calculating the helium amount in the metering tank through the reading of a pressure gauge I and the volume of the metering tank, opening the valve I, a regulating valve and a valve III, calculating the total space volume occupied by the helium through the total amount of the original helium and the helium pressure at the current stage after the helium is balanced between the metering tank and a coal sample tank, subtracting the total space volume from the sum of the volumes of the metering tank and the coal sample tank to obtain the true volume of the coal sample, and dividing the mass of the coal sample by the true volume of the coal sample to obtain the true density of the coal sample.
8. The method for testing a gas adsorption-desorption-recovery test apparatus for a coal body according to claim 7, wherein: the specific operation method of step S2 is as follows:
s2-1, checking the air tightness of the metering tank and the coal sample tank, and calculating the total space volume after subtracting the true volume of the coal sample;
s2-2, after vacuumizing, closing all pressure reducing valves and valves;
s2-3, opening a second pressure reducing valve, an air supply valve and a valve I, filling gas into a metering tank, closing the second pressure reducing valve, the air supply valve and the valve I, calculating the gas quantity through the reading of a pressure gauge I and the volume of the metering tank, then keeping the second pressure reducing valve and the air supply valve closed, opening the valve I, a regulating valve and a valve III, after 12 hours, waiting for the pressure gauge I and the pressure gauge II to be stable and display the same pressure value, recording the pressure value, calculating the residual gas quantity after adsorption through the pressure value and the total space volume, and then obtaining the gas quantity adsorbed by the coal sample; then recording the pressure value and the gas amount absorbed by the coal sample once every 12 hours, and recording 5-10 periods;
and S2-4, drawing a curve of the gas quantity adsorbed in a constant temperature state relative to the adsorption equilibrium pressure, namely the gas isothermal adsorption curve of the coal sample.
9. The method for testing a gas adsorption-desorption-recovery test apparatus for a coal body according to claim 8, wherein: the specific operation method of step S3 is as follows:
s3-1, after the coal sample fully adsorbs gas, closing the regulating valve and the valve III, and recording the pressure value displayed by the pressure gauge II at the moment;
s3-2, opening a valve IV, adjusting the height of the liquid level adjusting container to enable the liquid level in the measuring cylinder to be 0mL, and transferring the gas at the top of the measuring cylinder into an air bag;
s3-3, closing a valve IV, opening an exhaust valve, then slowly opening a valve III, rapidly closing the valve III when the gauge pressure is reduced by 0.5-1 MPa and the desorption gas collected in the measuring cylinder does not exceed the range, displaying a pressure value record after the reading of a pressure gauge II is constant, then adjusting the height of the liquid level adjusting container again to enable the liquid level height of the measuring cylinder to be level with the liquid level height of the liquid level adjusting container, recording the liquid level height in the measuring cylinder at the moment to be the free volume of the desorption gas, wherein the free volume is the desorption amount between the two pressure values;
s3-4, repeating the steps S3-2 and S3-3 until no desorption gas is discharged;
and S3-5, drawing a desorption amount-pressure curve, namely the isothermal desorption curve of the gas of the coal sample.
10. The method for testing a gas adsorption-desorption-recovery test apparatus for a coal body according to claim 9, wherein: the specific operation method of step S4 is as follows:
s4-1, after the coal sample fully adsorbs gas, closing a regulating valve and a valve III;
s4-2, opening a valve IV, adjusting the height of the liquid level adjusting container to enable the liquid level in the measuring cylinder to be 0mL, and transferring the gas at the top of the measuring cylinder into an air bag;
s4-3, closing the valve IV, opening the exhaust valve and the valve III, starting timing simultaneously, adjusting the liquid level adjusting container in real time to enable the liquid level height of the measuring cylinder to be flush with the liquid level height of the liquid level adjusting container, and recording the gas volume at the top of the measuring cylinder and the corresponding time; in addition, the mass flowmeter is connected with the computer, and the gas quantity passing through the mass flowmeter and the corresponding time data can be transmitted to the computer; and averaging the gas desorption data detected by the measuring cylinder and the mass flowmeter, and then drawing a curve of the gas desorption amount of the coal sample relative to time, namely the gas desorption curve of the coal sample.
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