CN112432879B - Gas adsorption-desorption-recovery test device and test method for coal body - Google Patents
Gas adsorption-desorption-recovery test device and test method for coal body Download PDFInfo
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- CN112432879B CN112432879B CN202010990235.5A CN202010990235A CN112432879B CN 112432879 B CN112432879 B CN 112432879B CN 202010990235 A CN202010990235 A CN 202010990235A CN 112432879 B CN112432879 B CN 112432879B
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Abstract
The invention discloses a gas adsorption-desorption-recovery test device of a coal body 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 flowmeter and a desorption system capable of exhausting at constant pressure and recycling, which are sequentially connected to the main pipeline, and a plurality of valves are arranged on the main pipeline for gas control; the main pipeline is sequentially provided with an air supply valve, a regulating valve and an exhaust valve from upstream to downstream; the testing method comprises the steps of obtaining the true density of the coal body, obtaining the gas isothermal adsorption curve of the coal body, obtaining the gas isothermal desorption curve of the coal body, obtaining the 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 multiple aspects, but also realizes technical breakthroughs such as convenient control, constant-pressure exhaust, cyclic utilization, high test precision, high safety and the like, and has great significance for national and public interests.
Description
Technical Field
The invention relates to coal mine safety and laboratory safety, in particular to a gas adsorption-desorption-recovery test device and a test method for a coal body.
Background
The gas adsorption and desorption characteristics of the coal body are the main basis for predicting the risk of the burst of coal and gas, the research on the gas adsorption and desorption characteristics of the coal body is gradually increased, the gas desorption data are obtained by 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 in the desorption process, the height of the liquid column is continuously reduced, so that the influence on the gas desorption is different, the external air pressure of the gas desorption is continuously changed, and the desorption data precision is reduced.
In addition, methane gas is inflammable and explosive gas, and a large amount of methane tests are carried out in a laboratory without collection, so that potential safety hazards are often caused, and the collected methane gas can be used for a second time, so that material cost is saved.
Finally, the testers usually adjust the height of the conical flask through manual operation to adjust the liquid level in the measuring cylinder, the scheme is poor in stability in the adjusting process, and the conical flask is difficult to fix at a specific height, so that the operation convenience of the test is affected, and the test efficiency and the test precision are reduced.
Disclosure of Invention
The invention aims to solve the technical problem of providing the gas adsorption-desorption-recovery test device and the test method for the coal body, which not only can fully test the characteristics between the coal sample and the gas in multiple aspects, but also realize technical breakthroughs such as convenient control, constant-pressure exhaust, cyclic utilization, high test precision, high safety and the like, and have great significance for national and public benefits.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the gas adsorption-desorption-recovery test device for the coal body comprises a main pipeline, wherein an air supply valve, a regulating valve and an exhaust valve are sequentially arranged on the main pipeline from upstream to downstream; the upstream of the air 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; the position between the air supply valve and the regulating valve on the main pipeline is connected with a metering tank through a valve I, the position between the regulating valve and the air exhaust valve on the main pipeline is respectively connected with a vacuum pump and a coal sample tank through a valve II and a valve III, the metering tank and the coal sample tank are placed into 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, a pressure gauge II and a pressure gauge III, a mass flowmeter is arranged on the main pipeline at the downstream of the air exhaust valve, the tail end of the main pipeline is connected with an air tail pipe, the tail end of the air tail pipe is immersed in a measuring cylinder which is filled with water and is sealed, the bottom of the measuring cylinder is connected with a liquid level regulating 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, zero scale of the measuring cylinder is positioned at the top of the side wall of the measuring cylinder, the measuring cylinder is also internally provided with a constant-pressure exhaust device connected with the tail end of the air tail pipe, and the constant-pressure exhaust device comprises a floating plate and a connecting rod with the tail end and the tail end of the floating plate and the tail end.
Preferably, the liquid level adjustment container is connected with the crane, and the crane includes the base, sets up the electric telescopic handle on the base perpendicularly and connects the clip on electric telescopic handle top, and the liquid level adjustment container is realized fixedly by the clip centre gripping.
Preferably, the outside of gasbag sets up the safety cover, and the safety cover inner wall sets up pressure sensor, and pressure sensor is connected with bee calling organ.
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 cutting part forms an opening of the protective cover.
Preferably, the surface of the protective cover is hollowed out to form a small hole which is convenient for observing the state of the air bag inside the protective cover.
The test method of the gas adsorption-desorption-recovery test device of the coal body comprises the following steps:
s1, obtaining the true density of a coal body;
s2, acquiring a gas isothermal adsorption curve of a coal body;
s3, acquiring 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 air 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 positioned at the position of 0mL, thereby transferring the gas at the top of the measuring cylinder into the air bag, and closing the valve IV; the gas collected in the air bag can be recycled, and the danger caused by discharging the gas into the room is avoided.
Preferably, the specific operation method of the step S1 is as follows:
s1-1, weighing a coal sample and then placing the weighed coal sample into a coal sample tank;
s1-2, checking the air tightness of the metering tank and the coal sample tank: closing the valve II and the exhaust valve, opening the air supply valve, the valve I, the regulating valve, the valve III and the 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 5-7MPa, observing the pressure values of the pressure gauge I and the pressure gauge II, thereby 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 the air tightness of the metering tank and the coal sample tank is determined, and discharging helium in the metering tank and the coal sample tank;
s1-3, vacuumizing: closing the exhaust valve and the valve IV, opening the valve I, the regulating valve, the valve II and the valve III, starting the vacuum pump to exhaust air, and after the absolute pressure values of the pressure gauge I and the pressure gauge II are below 4Pa, considering the inside of the metering tank and the coal sample tank to be in a vacuum state, and closing the regulating valve, the valve II and the valve III to keep the vacuum state inside 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 the valve I, calculating the helium volume in the metering tank through the reading of a pressure gauge I and the volume of the metering tank, opening the valve I, regulating and controlling the valve III, balancing the helium between the metering tank and a coal sample tank, calculating the total space volume occupied by the helium through the total helium and the helium pressure in the current stage, subtracting the total space volume from the sum of the volumes of the metering tank and the coal sample tank, and obtaining the real volume of the coal sample, wherein the mass of the coal sample is divided by the real volume of the coal sample, so as to obtain the real density of the coal sample.
Preferably, the specific operation method of the 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 the pressure reducing valves and valves;
s2-3, opening a second pressure reducing valve, a gas supply valve and a valve I, filling gas into a metering tank, closing the second pressure reducing valve, the gas supply valve and the valve I, calculating the gas quantity through the reading of a pressure meter I and the volume of the metering tank, then keeping the second pressure reducing valve and the gas supply valve closed, opening the valve I, regulating the valve and the valve III, keeping the pressure meter I and the pressure meter II stable and displaying the same pressure value after 12 hours, 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 a coal sample; then recording a pressure value and the gas amount absorbed by the coal sample every 12 hours, and recording 5-10 periods;
s2-4, drawing a curve of the amount of gas adsorbed at a constant temperature relative to the adsorption equilibrium pressure, namely a gas isothermal adsorption curve of the coal sample.
Preferably, the specific operation method of the step S3 is as follows:
s3-1, after the coal sample fully adsorbs the gas, closing a regulating valve and a valve III, and recording a pressure value displayed by a 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 gas at the top of the measuring cylinder to the 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 collected desorption gas in the measuring cylinder does not exceed a measuring range, recording a display pressure value after the reading of the pressure gauge II is constant, and then adjusting the height of the liquid level regulating container again to enable the liquid level of the measuring cylinder to be level with the liquid level of the liquid level regulating container, wherein the liquid level in the measuring cylinder at the moment is recorded to be the free volume of the desorption gas, and the free volume is the desorption quantity between the two pressure values;
s3-4, repeating the steps S3-2 and S3-3 until no desorption gas is discharged;
s3-5, drawing a curve of desorption quantity relative to pressure, namely a gas isothermal desorption curve of the coal sample.
Preferably, the specific operation method of the step S4 is as follows:
s4-1, after the coal sample fully adsorbs the 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 gas at the top of the measuring cylinder to the air bag;
s4-3, closing a valve IV, opening an exhaust valve and a valve III, starting timing at the same time, adjusting the liquid level regulating container from time to time, enabling the liquid level of the measuring cylinder to be level with the liquid level of the liquid level regulating container, and recording the volume of gas at the top of the measuring cylinder and corresponding time; in addition, the mass flowmeter is connected with the computer, and the gas quantity passing through the mass flowmeter and corresponding time data can be transmitted to the computer; and after averaging the gas desorption data detected by the measuring cylinder and the mass flowmeter, drawing a curve of the gas desorption quantity of the coal sample relative to time, namely a gas desorption curve of the coal sample.
Step S4 may be performed after step S2 or step S3.
An anti-backflow device is arranged between the mass flowmeter and the measuring cylinder, so that water in the measuring cylinder can be prevented from flowing backwards to the mass flowmeter.
The backflow preventing device adopts a one-way valve.
The anti-backflow device can also adopt a sealed transparent container, and a main pipeline inside the sealed transparent container is disconnected.
The beneficial effects of adopting above-mentioned technical scheme to produce lie in: the invention not only can fully test the true density of the coal sample and the adsorption, desorption and recovery of the gas of the coal sample in many aspects, but also realizes the technical breakthroughs of convenient control, constant-pressure exhaust, recycling, high test precision, high safety and the like by technical means of constant-pressure exhaust devices, gas recovery of air bags, electric linear adjustment of the height of the liquid level adjustment container and the like, and has great significance to the national and public interests.
Drawings
The invention will be described in further detail with reference to the drawings and the detailed description.
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 an enlarged view of a portion of the constant pressure vent in the cylinder of the present invention.
Fig. 4 is a diagram showing the connection relationship between the mass flowmeter, the measuring cylinder and the backflow preventing device according to the present invention.
In the figure: 1. the main pipeline 2, the air supply valve 3, the regulating valve 4, the air exhaust valve 5, the first pressure reducing valve 6, the high-pressure helium bottle 7, the second pressure reducing valve 8, the high-pressure methane bottle 9, the valve I10, the metering tank 11, the valve III 12, the coal sample tank 13, the valve II 14, the vacuum pump 15, the constant-temperature water bath 16, the pressure gauge I17, the pressure gauge II 18, the pressure gauge III 19, the mass flowmeter 20, the air exhaust hose 21, the measuring cylinder 22, the liquid level regulating container 23, the air bag 24, the valve IV 25, the base 26, the electric telescopic rod 27, the clip 28, the protective cover 29, the half shell 30, the buckle 31, the opening 32, the small hole 33, the floating plate 34, the connecting rod 34, the transparent container 35 and the communication hose.
Detailed Description
Referring to figures 1-3 at the same time, the gas adsorption-desorption-recovery test device for coal bodies comprises a main pipeline 1, wherein a gas supply valve 2, a regulating valve 3 and a gas exhaust valve 4 are sequentially arranged on the main pipeline 1 from upstream to downstream; the main pipeline 1 is connected with a high-pressure helium bottle 6 and a high-pressure methane bottle 8 at the upstream of the air supply valve 2 through a first pressure reducing valve 5 and a second pressure reducing valve 7 respectively; the position between the air supply valve 2 and the regulating valve 3 on the main pipeline 1 is connected with a metering tank 10 through a valve I9, the position between the regulating valve 3 and the air exhaust valve 4 on the main pipeline 1 is respectively connected with a vacuum pump 14 and a coal sample tank 12 through a valve II 13 and a valve III 11, the metering tank 10 and the coal sample tank 12 are put 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, a pressure gauge II 17 and a pressure gauge III 18, a mass flowmeter 19 is arranged on the main pipeline 1 at the downstream of the air exhaust valve 4, the tail end of the main pipeline 1 is connected with an exhaust tail pipe 20, the tail end of the exhaust tail pipe 20 is immersed in a measuring cylinder 21 filled with water and sealed, 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 scale of the measuring cylinder 21 is positioned at the top of the side wall of the measuring cylinder 21.
Referring to fig. 3, a constant pressure exhaust device connected to the tail end of the tail pipe 20 is further provided in the measuring cylinder 21, and the constant pressure exhaust device includes a floating plate 33 and a connecting rod 34 with both 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, 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, unstable condition of the change of the water pressure of the exhaust is avoided, and test error is 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 protecting cover 28 is arranged outside the air bag 23, a pressure sensor is arranged on the inner wall of the protecting cover 28, and the pressure sensor is connected with a buzzer. When the gas recovery of the air bag 23 reaches the upper limit, the air bag 23 presses the pressure sensor, the pressure sensor detects that the pressure value reaches the upper limit, the buzzer is controlled to give out a dangerous alarm, and a tester is informed to immediately stop recovering the gas into the air bag 23, or the gas in the air 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 openings 31 of the protective cover 28. The protecting cover 28 can be opened by the buckle 30, so that the gas recovered in the air bag 23 can be conveniently transferred.
The surface of the protective cover 28 is hollowed out to form a small hole which is convenient for observing the state of the air bag 23 inside.
The test method of the gas adsorption-desorption-recovery test device of the coal body comprises the following steps:
s1, acquiring the true volume and the true density of a coal body, wherein the specific operation method comprises the following steps:
s1-1, weighing a coal sample and then placing the weighed coal sample into a coal sample tank 12;
s1-2, checking the air tightness of the metering tank 10 and the coal sample tank 12: closing the valve II 13 and the exhaust valve 4, opening the air supply valve 2, the valve I9, the regulating valve 3, the valve III 11 and the 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 the pressure gauge I16 and the pressure gauge II 17 are 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 the valve IV 24 after the air tightness of the metering tank 10 and the coal sample tank 12 is determined, and discharging helium in the metering tank 10 and the coal sample tank 12;
s1-3, vacuumizing: closing the exhaust valve 4 and the valve IV 24, opening the valve I9, the regulating valve 3, the valve II 13 and the valve III 11, starting the vacuum pump 14 to exhaust air, and after the absolute pressure values of the pressure gauge I16 and the pressure gauge II 17 are below 4Pa, considering the inside of the metering tank 10 and the coal sample tank 12 to be 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 metering tank 10 and the coal sample tank 12;
s1-4, opening a first pressure reducing valve 5 and an air supply valve 2, filling helium into a metering tank 10, closing the first pressure reducing valve 5, the air supply valve 2 and a valve I9, calculating the helium amount in the metering tank 10 through the reading of a pressure gauge I16 and the volume of the metering tank 10, opening the valve I9, regulating and controlling a valve 3 and a valve III 11, balancing the helium between the metering tank 10 and a coal sample tank 12, 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, and 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 real volume of the coal sample, wherein the mass of the coal sample is divided by the real volume of the coal sample, and the real density of the coal sample is obtained.
S2, acquiring a gas isothermal adsorption curve of a 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 the pressure reducing valves and valves;
s2-3, opening a second pressure reducing valve 7, a gas supply valve 2 and a valve I9, filling gas into a metering tank 10, closing the second pressure reducing valve 7, the gas 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, keeping the second pressure reducing valve 7 and the gas supply valve 2 closed, opening the valve I9, regulating and controlling the valve 3 and the valve III 11, keeping the pressure gauge I16 and the pressure gauge II 17 stable and displaying the same pressure value after 12 hours, recording the pressure value, calculating the residual gas quantity after adsorption through the pressure value and the total space volume, and obtaining the gas quantity adsorbed by a coal sample; then recording a pressure value and the gas amount absorbed by the coal sample every 12 hours, and recording 10 periods;
s2-4, drawing a curve of the amount of gas adsorbed at a constant temperature relative to the adsorption equilibrium pressure, namely a gas isothermal adsorption curve of the coal sample.
S3, acquiring a gas isothermal desorption curve of a coal body, wherein the specific operation method comprises the following steps:
s3-1, after the coal sample fully absorbs the 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 a liquid level adjusting container 22 to enable the liquid level in the measuring cylinder 21 to be 0mL, and transferring gas at the top of the measuring cylinder 21 to an air bag 23;
s3-3, closing a valve IV 24, opening an exhaust valve 4, then slowly opening a valve III 11, rapidly closing the valve III 11 when the gauge pressure is reduced by 0.5-1 MPa and the collection desorption gas in the measuring cylinder 21 does not exceed a measuring range, recording a display pressure value after the reading of a pressure gauge II 17 is constant, and then adjusting the height of a liquid level adjusting container 22 again to enable the liquid level of the measuring cylinder 21 to be level with the liquid level of the liquid level adjusting container 22, wherein the liquid level in the measuring cylinder 21 is recorded as the free volume of the desorption gas at the moment, and the free volume is the desorption quantity between the two pressure values;
s3-4, repeating the steps S3-2 and S3-3 until no desorption gas is discharged;
s3-5, drawing a curve of desorption quantity relative to pressure, namely a gas isothermal desorption curve of the coal sample.
S4, acquiring a gas desorption curve of a coal body, wherein the specific operation method comprises the following steps:
s4-1, after the coal sample fully adsorbs the gas, closing the regulating valve 3 and the valve III 11;
s4-2, opening a valve IV 24, adjusting the height of a liquid level adjusting container 22 to enable the liquid level in the measuring cylinder 21 to be 0mL, and transferring gas at the top of the measuring cylinder 21 to an air bag 23;
s4-3, closing a valve IV 24, opening an exhaust valve 4 and a valve III 11, starting timing, adjusting the liquid level regulating container 22 at any time, enabling the liquid level of the measuring cylinder 21 to be level with the liquid level of the liquid level regulating container 22, and recording the volume of gas at the top of the measuring cylinder 21 and the corresponding time; the mass flowmeter 19 is connected with a computer, and can transmit the gas amount passing through the mass flowmeter 19 and corresponding time data to the computer; after the gas desorption data detected by the measuring cylinder 21 and the mass flowmeter 19 are averaged, a curve of the gas desorption amount of the coal sample relative to time is drawn, namely, a gas desorption curve of the coal sample.
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 air 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 regulating container 22 to enable the liquid level in the measuring cylinder 21 to be positioned at the position of 0mL, thereby transferring the gas at the top of the measuring cylinder 21 into the air bag 23, and closing the valve IV 24; the gas collected in the air bag 23 can be recycled and can be prevented from being discharged indoors to cause danger.
Referring to fig. 4, a backflow preventing device is provided between the mass flowmeter 19 and the measuring cylinder 21, and can prevent water in the measuring cylinder 21 from flowing backward to the mass flowmeter 19. The backflow preventing device adopts a sealed transparent container 34, and the main pipeline 1 inside the sealed transparent container 34 is disconnected.
The above description is presented only as a practical solution of the invention and is not intended as a single limitation on the solution itself.
Claims (9)
1. The gas adsorption-desorption-recovery test device for the coal body comprises a main pipeline, wherein an air supply valve, a regulating valve and an exhaust valve are sequentially arranged on the main pipeline from upstream to downstream;
the upstream of the air 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;
the position between the air supply valve and the regulating valve on the main pipeline is connected with a metering tank through a valve I, and the main pipeline is provided with
The position 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 is put into to metering tank and coal sample jar, and metering tank, coal sample jar and vacuum pump set up manometer I, manometer II and manometer III, its characterized in that respectively: a mass flowmeter is arranged on the main pipeline at the downstream of the exhaust valve, 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 sealed, the bottom of the measuring cylinder is connected with a liquid level regulating 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 connected with the tail end of the tail pipe is also arranged in the measuring cylinder, and the constant pressure exhaust device comprises a floating plate and a connecting rod, wherein the two ends of the connecting rod are fixedly connected with the lower surface of the floating plate and the tail end of the tail pipe respectively;
the outside of gasbag sets up the safety cover, and the safety cover inner wall sets up pressure sensor, and pressure sensor is connected with bee calling organ.
2. The gas adsorption-desorption-recovery test device for coal bodies according to claim 1, wherein: the liquid level adjustment container is connected with the crane, and the crane includes the base, sets up the electric telescopic handle on the base perpendicularly and connects the clip on electric telescopic handle top, and the liquid level adjustment container is realized fixedly by the clip centre gripping.
3. The gas adsorption-desorption-recovery test device for coal bodies according to claim 1, wherein: 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 cutting part forms an opening of the protective cover.
4. A gas adsorption-desorption-recovery test device for coal bodies according to claim 3, wherein: the surface of the protective cover is hollowed out to form a small hole which is convenient for observing the state of an air bag inside the protective cover.
5. The test method of the gas adsorption-desorption-recovery test device for coal bodies according to claim 1, wherein: the method comprises the following steps:
s1, obtaining the true density of a coal body;
s2, acquiring a gas isothermal adsorption curve of a coal body;
s3, acquiring 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 air 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 positioned at a position of 0mL, thereby transferring the gas at the top of the measuring cylinder into the air bag, and closing the valve IV; the gas collected in the air bag can be recycled, and the danger caused by discharging the gas into the room is avoided.
6. The method for testing a coal gas adsorption-desorption-recovery test device according to claim 5, wherein: the specific operation method of the step S1 is as follows:
s1-1, weighing a coal sample and then placing the weighed coal sample into a coal sample tank;
s1-2, checking the air tightness of the metering tank and the coal sample tank: closing the valve II and the exhaust valve, opening the air supply valve, the valve I, the regulating valve, the valve III and the 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 5-7MPa, observing the pressure values of the pressure gauge I and the pressure gauge II, thereby 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 the air tightness of the metering tank and the coal sample tank is determined, and discharging helium in the metering tank and the coal sample tank;
s1-3, vacuumizing: closing the exhaust valve and the valve IV, opening the valve I, the regulating valve, the valve II and the valve III, starting the vacuum pump to exhaust air, and after the absolute pressure values of the pressure gauge I and the pressure gauge II are below 4Pa, considering the inside of the metering tank and the coal sample tank to be in a vacuum state, and closing the regulating valve, the valve II and the valve III to keep the vacuum state inside 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 the valve I, calculating the helium quantity in the metering tank according to the reading of a pressure gauge I and the volume of the metering tank, opening the valve I, regulating and controlling the valve III, balancing the helium between the metering tank and a coal sample tank, and obtaining the total quantity of the original helium and the helium pressure in the current stage,
and calculating the total space volume occupied by helium, and subtracting the total space volume from the sum of the volumes of the metering tank and the coal sample tank to obtain the real volume of the coal sample, wherein the mass of the coal sample is divided by the real volume of the coal sample to obtain the real density of the coal sample.
7. The method for testing a coal gas adsorption-desorption-recovery test device according to claim 6, wherein: the specific operation method of the 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 the pressure reducing valves and valves;
s2-3, opening a second pressure reducing valve, a gas supply valve and a valve I, filling gas into a metering tank, closing the second pressure reducing valve, the gas supply valve and the valve I, calculating the gas quantity through the reading of a pressure meter I and the volume of the metering tank, then keeping the second pressure reducing valve and the gas supply valve closed, opening the valve I, regulating the valve and the valve III, keeping the pressure meter I and the pressure meter II stable and displaying the same pressure value after 12 hours, 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 a coal sample; then recording a pressure value and the gas amount absorbed by the coal sample every 12 hours, and recording 5-10 periods;
s2-4, drawing a curve of the amount of gas adsorbed at a constant temperature relative to the adsorption equilibrium pressure, namely a gas isothermal adsorption curve of the coal sample.
8. The method for testing a coal gas adsorption-desorption-recovery test device according to claim 7, wherein: the specific operation method of the step S3 is as follows:
s3-1, after the coal sample fully adsorbs the gas, closing a regulating valve and a valve III, and recording a pressure value displayed by a 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 gas at the top of the measuring cylinder to the 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 collected desorption gas in the measuring cylinder does not exceed a measuring range, recording a display pressure value after the reading of the pressure gauge II is constant, and then adjusting the height of the liquid level regulating container again to enable the liquid level of the measuring cylinder to be level with the liquid level of the liquid level regulating container, wherein the liquid level in the measuring cylinder at the moment is recorded to be the free volume of the desorption gas, and the free volume is the desorption quantity between the two pressure values;
s3-4, repeating the steps S3-2 and S3-3 until no desorption gas is discharged;
s3-5, drawing a curve of desorption quantity relative to pressure, namely a gas isothermal desorption curve of the coal sample.
9. The method for testing a coal gas adsorption-desorption-recovery test device according to claim 8, wherein: the specific operation method of the step S4 is as follows:
s4-1, after the coal sample fully adsorbs the 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 gas at the top of the measuring cylinder to the air bag; s4-3, closing a valve IV, opening an exhaust valve and a valve III, starting timing at the same time, adjusting the liquid level regulating container from time to time, enabling the liquid level of the measuring cylinder to be level with the liquid level of the liquid level regulating container, and recording the volume of gas at the top of the measuring cylinder and corresponding time;
in addition, the mass flowmeter is connected with the computer, and the gas quantity passing through the mass flowmeter and corresponding time data can be transmitted to the computer; and after averaging the gas desorption data detected by the measuring cylinder and the mass flowmeter, drawing a curve of the gas desorption quantity of the coal sample relative to time, namely a gas desorption curve of the coal sample.
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