Coal bed gas desorption device

Abstract

The invention relates to a coalbed methane desorption device in the technical field of coalbed methane exploitation, which comprises a base, a desorption cylinder and a measuring cylinder, the desorption cylinder is connected with the measuring cylinder through a communicating pipe, the bottom of the desorption cylinder is connected with a gas inlet pipe, and the bottom of the measuring cylinder is connected with a drain valve; a coal sample tank sampling cabin is arranged on the right side of the desorption cylinder; the coal sample tank is connected with the desorption cylinder through a hose, a temperature and humidity sensor is mounted on the gas inlet pipe, a radar liquid level meter is arranged on the top of the desorption cylinder, an ultrasonic liquid level meter is arranged on the top of the measuring cylinder, and a differential pressure sensor is arranged on the top side of the desorption cylinder; a digital display cabin is arranged on the left side of the measuring cylinder. A touch display screen, a single-chip microcomputer controller and a storage battery pack are arranged in the digital display cabin. A top cabin is arranged above the desorption cylinder and the measuring cylinder, and a water replenishing tank is arranged in the top cabin and is connected with the desorption cylinder through a water replenishing valve. The coal bed gas desorption device is more convenient to carry and detect, and the coal bed gas desorption speed and the desorption amount are easier and more accurate in digital readings; and a standby water supplementing tank is arranged, so that the trouble of finding water on site is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of coalbed methane mining, and in particular relates to a coalbed methane desorption device. Background Art

[0002] Coalbed methane is also called gas. The gas content of a coalbed refers to the amount of gas contained in a unit volume or weight of coal in its natural state. It is one of the basic parameters of coalbed gas and plays a vital role in predicting the danger of coalbed outbursts and formulating targeted anti-outburst designs and measures. Coal mine safety production is restricted by gas accidents such as gas explosions, gas outbursts, and coal and gas outbursts. The study of gas desorption laws is of great significance for predicting coal mine gas content, predicting coalbed outburst dangers, and testing gas extraction effects. At present, the detection of coalbed gas content mainly uses the adsorption-desorption experimental method as the main research method to study the gas desorption rate and desorption amount of the initial law of coal gas desorption. The gas desorption measurement device is an indispensable main equipment.

[0003] The law of coal body gas desorption can provide an important theoretical basis for the determination of coal seam gas content and pressure, prediction of coal and gas outbursts, and exploration and development of coal seam gas resources. At present, the study of the adsorption and desorption (also known as analysis) law of coal bodies, on the one hand, calculates the amount of lost gas according to the law of gas desorption, and on the other hand, seeks outburst hazard prediction indicators and their critical values ​​according to the law of gas desorption. The direct measurement method is generally used for the determination of coal seam gas content, and its measurement device consists of an underground measurement device and a ground measurement device. The direct method for determining coal seam gas content mainly includes: geological exploration borehole gas desorption method, underground borehole gas desorption method and coal core sampling method. The basic method for determining the gas content in coal seams is to take coal drill cuttings or coal cores when the coal seams are just exposed, quickly put them into a sealed container (usually a coal sample tank), determine their desorption rate and desorption amount Q2, use the desorption law to infer and compensate for the total amount of the part that escaped during the sample collection process Q1, and then return to the laboratory to determine the gas residual amount Q3 in the coal sample, and finally obtain the gas content Q = Q1 + Q2 + Q3. The existing underground gas desorption instrument adopts the drainage gas collection method, which replaces the water column in the measuring cylinder with the desorbed gas, and determines the gas desorption rate and desorption amount by reading the height of the gas column.

[0004] Currently, the most common gas desorption instrument is a transparent measuring cylinder filled with water. When in use, the air inlet of the gas desorption instrument is connected to the air outlet of the coal sample tank through a hose, and then the air outlet valve on the top cover of the coal sample tube is opened to start gas desorption. By measuring the height of the water column displaced by the coalbed methane desorbed from the coal sample, the speed and amount of coalbed methane in the coal sample can be obtained by the speed and size of the water level change.

[0005] The structure and functional design of the existing gas desorption instrument are relatively simple. When performing gas desorption detection, it is necessary to carry the necessary tools and equipment, such as: desorption instrument, coal sample tank, pressure gauge, stopwatch, etc. It is very inconvenient to carry with you, and it is easy to forget to bring a certain equipment, which may cause various troubles to the detection work.

[0006] In addition, the existing desorbers are inconvenient to operate and have a low degree of automation. They read once every minute and continuously read and record for 30 minutes. Generally, measurements require continuous readings of more than 30 times, and the operation is relatively cumbersome. The measurement personnel are more subjective when detecting the readings, and the light in the well is dim, so there are certain errors in the readings. When the desorber measures the desorption rate, it is easily affected by the water temperature and the saturated vapor pressure of water, causing errors, and is limited by manual readings, resulting in the inability to quickly and accurately obtain the desorption amount and desorption rate data.

[0007] In addition, the desorber needs to be filled with water every time it is tested. When there is a shortage of water on site or a suitable water source cannot be found, it will cause considerable trouble to the detection work. Moreover, when adding water to the existing desorber, it is necessary to first unscrew and pull out the bottom plug and then fill it with water. When filling with water, the original gas of the desorber is not easy to be discharged, and water is easy to spray out from the water outlet and the air inlet, resulting in inconvenient water filling operation, difficult to grasp the amount of water filling, the range of the desorber cannot be fully utilized, the scale reading measurement results are not accurate enough, and the measurement error is large. Summary of the invention

[0008] In view of the above situation, the present invention provides a coalbed methane desorption device, which is more convenient to carry and detect, and the detection results are easier to read with higher accuracy. There is no need to add water frequently, and water injection is more convenient, avoiding the trouble of finding water on site.

[0009] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0010] A coalbed methane desorption device comprises a base, a desorption cylinder and a measuring cylinder, wherein the bottom of the desorption cylinder is sealedly connected to the upper right portion of the base, and the measuring cylinder is sealedly connected to the upper left portion of the base; the desorption cylinder and the measuring cylinder are both sealed vertical cylindrical measuring cylinders, the desorption cylinder and the measuring cylinder are connected to each other through a connecting pipe in the middle of the bottom, an air inlet pipe is connected to the right side of the bottom of the desorption cylinder, and a drain pipe is connected to the left side of the bottom of the measuring cylinder, and a drain valve is provided on the drain pipe.

[0011] A detachable sampling cabin for placing the coal sample tank is arranged on the right side of the desorption cylinder; a top cover is sealingly screwed on the top of the coal sample tank, an exhaust angle valve is arranged on the top cover, the outlet nozzle of the exhaust angle valve is pluggably connected to the air inlet pipe of the desorption cylinder through a hose, a temperature and humidity sensor is installed on the air inlet pipe, a radar level gauge is arranged on the top of the desorption cylinder for correspondingly measuring the height of the water level drop inside the desorption cylinder, an ultrasonic level gauge is arranged on the top of the measuring cylinder for correspondingly measuring the height of the water level rise in the measuring cylinder, and a differential pressure sensor is also arranged on one side of the top of the desorption cylinder.

[0012] A digital display cabin is arranged on the left side of the measuring cylinder, and a touch display screen is embedded and installed on the upper side wall of the digital display cabin. A single-chip microcomputer controller is arranged on the inner wall of the digital display cabin. The temperature and humidity sensor, radar level gauge, ultrasonic level gauge, differential pressure sensor and touch display screen are all electrically connected to the single-chip microcomputer controller. A rechargeable battery pack for powering various electrical equipment is also arranged in the digital display cabin.

[0013] A top cabin is also arranged above the desorption cylinder and the measuring cylinder, a water supply tank is arranged inside the top cabin, the bottom of the water supply tank is connected with the top of the desorption cylinder through a water supply pipe, and a water supply valve is arranged on the water supply pipe; a stopwatch is arranged on the left side of the top cabin, and an empty box barometer is arranged on the right side of the top cabin.

[0014] Furthermore, an ultrasonic transducer for high-frequency vibration of the coal sample tank is arranged at the bottom of the sampling cabin, an ultrasonic generator connected to the ultrasonic transducer is arranged in the base, and a spring sheet for pressing the coal sample tank is arranged on the top of the sampling cabin.

[0015] Furthermore, the connecting tube between the desorption cylinder and the measuring cylinder is a silicone tube, and a clamping valve is provided at each end of the connecting tube. The clamping pressure of the clamping valve on the silicone tube is adjustable. Under normal circumstances, it can just maintain the height of the water column in the desorption cylinder to prevent the water in the desorption cylinder from flowing into the left measuring cylinder. After the desorption gas of the coal sample tank is introduced into the desorption cylinder, the gas pressure above the water surface inside the desorption cylinder increases. At this time, the water in the desorption cylinder under pressure can break the restraint of the clamping valve on the silicone tube and gradually penetrate into the measuring cylinder.

[0016] Furthermore, an air intake valve is provided between the bottom of the desorption cylinder and the air intake pipe, which can switch on and off the air intake of the desorption cylinder. When the coal sample tank is connected to the desorption cylinder hose and the exhaust angle valve on the top cover of the coal sample tank is turned on, the air intake of the desorption cylinder can be started by opening the air intake valve.

[0017] Furthermore, a discharge pipe is connected to the bottom side wall of the air inlet pipe, and a discharge valve is installed on the discharge pipe, which can be used for initial coalbed methane top pipe exhaust of the air inlet pipe, and can also be used for clearing and unblocking the air inlet pipe and temporary drainage of the desorption cylinder.

[0018] Furthermore, a ventilation pipe is connected to the top of the desorption cylinder, and a ventilation valve is arranged on the ventilation pipe. When the ventilation valve is opened, the desorption cylinder is connected to the atmosphere, which is used to measure the breathing exhaust when the water in the cylinder is pressurized and flows back into the desorption cylinder.

[0019] Furthermore, a second ventilation pipe is connected to the top of the measuring cylinder, and a second ventilation valve is arranged on the second ventilation pipe. When the second ventilation valve is opened, the measuring cylinder is connected to the atmosphere, which is used for air intake into the desorption cylinder. When water in the desorption cylinder enters the measuring cylinder, the breathing in the measuring cylinder is exhausted.

[0020] Furthermore, a water inlet is provided on the top of the water replenishment tank, and a sealing cock is provided on the water inlet to add water to the water replenishment tank. Under normal circumstances, the water in the desorption cylinder and the measuring cylinder can be used back and forth for many times, and generally does not need to be frequently added.

[0021] The present invention also includes other components that enable it to be used normally, all of which are conventional means in the field. In addition, devices or components not limited in the present invention, such as: coal sample tank, desorption cylinder, pinch valve, temperature and humidity sensor, radar level gauge, ultrasonic level gauge, differential pressure sensor, ultrasonic generator, ultrasonic transducer, touch display, single-chip microcomputer controller and battery pack, etc., all adopt the existing technology in the field.

[0022] The beneficial effects of the present invention are as follows:

[0023] 1) The coalbed methane desorption device has a reasonable structural design and integrates multiple functions. It can effectively solve the problems of simple structure and single function of gas desorption instruments in the prior art, and avoid the problem that gas detection personnel carry too many tools and equipment, which may easily lead to the omission of items.

[0024] 2) The coalbed methane desorption device is easy to operate, has a high degree of equipment automation, is convenient for digital reading, and has high accuracy in coalbed methane desorption rate and desorption amount detection data; it can effectively solve the problem that the naked eye reading of the water column height of the existing gas desorption instrument is highly subjective and has large reading errors.

[0025] 3) The water in the desorption cylinder and the measuring cylinder of the coalbed methane desorption device can be used back and forth multiple times, saving the demand for water for detection and eliminating the need for frequent water addition. It is also equipped with a spare water replenishment tank to provide emergency water replenishment to the desorption cylinder, which can effectively cope with water shortages on coal mine sites and improve the applicability of the coalbed methane desorption device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the structure of the coalbed methane desorption device in the embodiment.

[0027] Figure 2 for Figure 1 Schematic diagram of the local enlarged structure at point A in the middle.

[0028] Figure 3 for Figure 1 Schematic diagram of the three-dimensional structure of the pinch valve.

[0029] Figure 4 for Figure 1 Schematic diagram of the three-dimensional structure of the middle spring leaf.

[0030] In the figure: base 1, desorption cylinder 2, measuring cylinder 3, connecting pipe 4, air inlet pipe 5, drain pipe 6, drain valve 7, coal sample tank 8, sampling cabin 9, top cover 10, exhaust angle valve 11, hose 12, temperature and humidity sensor 13, radar level gauge 14, ultrasonic level gauge 15, differential pressure sensor 16, digital display cabin 17, touch display screen 18, single-chip microcomputer controller 19, battery pack 20, top cabin 21, water supply tank 22, water supply pipe 23, water supply valve 24, stopwatch 25, empty box barometer 26, ultrasonic transducer 27, ultrasonic generator 28, spring sheet 29, pinch valve 30, sleeve 301, rubber airbag 302, air nozzle 303, air inlet valve 31, discharge pipe 32, discharge valve 33, vent pipe one 34, vent valve one 35, vent pipe two 36, vent valve two 37, sealing cock 38. DETAILED DESCRIPTION

[0031] The technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments.

[0032] It should be noted that the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside" and the like indicating directions or positional relationships are based on the accompanying drawings and are only for the convenience of description.

[0033] Example

[0034] like Figure 1-2As shown, a coalbed methane desorption device comprises a base 1, a desorption cylinder 2 and a measuring cylinder 3, the bottom of the desorption cylinder is sealed and connected to the upper right part of the base, the measuring cylinder is sealed and connected to the upper left part of the base, and the interior of the base is a rectangular cavity structure; the desorption cylinder and the measuring cylinder are both sealed vertical cylindrical measuring cylinders made of transparent organic glass, the desorption cylinder and the measuring cylinder are connected to each other through a connecting pipe 4 made of silica gel in the middle of the bottom, an air inlet pipe 5 is connected to the right side of the bottom of the desorption cylinder, a drain pipe 6 is connected to the left side of the bottom of the measuring cylinder, a drain valve 7 is provided on the drain pipe for draining water from the measuring cylinder, and scale lines for indicating the height of the water column are respectively provided on the side walls of the desorption cylinder and the measuring cylinder, the inner ends of the water inlet pipe, the connecting pipe and the drain pipe are correspondingly extended to the height of the lowest scale line inside the desorption cylinder and the measuring cylinder, the zero scale line of the desorption cylinder is located at the upper part thereof, and the zero scale line of the measuring cylinder is located at the lower part thereof. When the desorption cylinder is filled with air, the bubbles will rise to the upper part of the desorption cylinder, and the water in the desorption cylinder will be gradually pressed into the measuring cylinder through the connecting pipe. The water column level in the desorption cylinder will gradually decrease, and the water column level in the measuring cylinder will gradually increase. At this time, the height of the liquid level drop in the desorption cylinder or the height of the water column rise in the measuring cylinder is the amount of coalbed methane analyzed by displacement. At the same time, the time corresponding to the change of the liquid level can be recorded to obtain the coalbed methane desorption rate.

[0035] A sampling cabin 9 for detachably placing a coal sample tank 8 is arranged on the right side of the desorption cylinder; a top cover 10 is sealingly screwed on the top of the coal sample tank, and an exhaust angle valve 11 is arranged on the top cover. The outlet nozzle of the exhaust angle valve is pluggably connected to the air inlet pipe of the desorption cylinder through a hose 12. The hose is made of silicone or rubber material, and the sealing of the plug-in joint is guaranteed after plugging in to avoid air leakage.

[0036] A temperature and humidity sensor 13 is installed on the air inlet pipe to detect the temperature and humidity data in the desorbed coalbed methane. A radar level meter 14 is set on the top of the desorption cylinder to measure the corresponding drop in the water level inside the desorption cylinder. The radar level meter detects the liquid level by reflecting and receiving radar electromagnetic waves. Compared with the ultrasonic level meter that uses ultrasonic reflection and reception to detect the liquid level, the radar level meter has better detection accuracy and application range than the ultrasonic level meter.

[0037] An ultrasonic level meter 15 is provided on the top of the measuring cylinder, which is used to measure the water level rise in the measuring cylinder. The liquid level drop detected by the radar level meter in the desorption cylinder and the liquid level rise detected by the ultrasonic level meter in the measuring cylinder are sent to the touch screen for display. The single-chip microcomputer controller can more accurately grasp the coalbed methane desorption data and whether there is leakage in the desorption cylinder, the measuring cylinder and its connecting pipe by analyzing and comparing the detection signals of the two level meters. If the detection difference between the two level meters is large, it means that there may be a loophole in the system, and an alarm prompt can be issued. A differential pressure sensor 16 is also provided on one side of the top of the desorption cylinder. The low-pressure end of the differential pressure sensor is connected to the top of the desorption cylinder, and the high-pressure end of the differential pressure sensor is connected to the outside atmosphere. It is used to detect the gas analysis pressure in the desorption cylinder, and send the detection information to the single-chip microcomputer controller and the touch screen for display.

[0038] A digital display cabin 17 is provided on the left side of the measuring cylinder, a touch display screen 18 is embedded and installed on the upper side wall of the digital display cabin, a single-chip controller 19 is provided on the inner wall of the digital display cabin, the temperature and humidity sensor, radar level gauge, ultrasonic level gauge, differential pressure sensor and touch display screen are all electrically connected to the single-chip controller, and a rechargeable battery pack 20 for powering various electrical devices is also provided in the digital display cabin. The touch display screen and the single-chip controller are both mature existing technologies in the field of automation technology, and the specific settings are not repeated here.

[0039] A top cabin 21 is also provided above the desorption cylinder and the measuring cylinder, and a handle is also provided above the top cabin for easy carrying and gripping. A water replenishment tank 22 is provided inside the top cabin, and the bottom of the water replenishment tank is connected with the top of the desorption cylinder through a water replenishment pipe 23, and a water replenishment valve 24 is provided on the water replenishment pipe; a stopwatch 25 is provided on the left side of the top cabin for accurate timing during the desorption process, for example: the display data of the liquid level change value of the desorption cylinder and the measuring cylinder is read once per minute during the desorption process, and the reading is continuously recorded for 30 minutes, and the reading is continuously read for more than 30 times; an empty box barometer 26 is provided on the right side of the top cabin for detecting the ambient atmospheric pressure at the desorption work site, whether the on-site air pressure is a standard atmospheric pressure, and providing a targeted ambient air pressure basis for the desorption work.

[0040] Specifically, an ultrasonic transducer 27 for high-frequency vibration of the coal sample tank is provided at the bottom of the sampling cabin, and an ultrasonic generator 28 connected to the ultrasonic transducer is provided in the base. High-frequency vibration helps to release the coalbed methane content in the coal sample more quickly and thoroughly. During the desorption process, the desorption parameters of the coal sample under normal non-vibration conditions can be read first, and finally the high-frequency vibration assistance is turned on to detect the extreme desorption data of the coal sample. Figure 4As shown, a U-shaped spring plate 29 for pressing the coal sample can is arranged at the upper part of the sampling chamber. The two side arms of the spring plate are respectively pressed on both sides of the exhaust angle valve on the top cover of the coal sample can, which is used to elastically press the coal sample can and ensure reliable contact between the bottom of the coal sample can and the ultrasonic transducer, facilitating the transmission of high-frequency oscillation.

[0041] Specifically, a pinch valve 30 is arranged at each end of the communicating pipe. As Figure 3 shown, the pinch valve includes a tubular sleeve 301 and an hourglass-shaped rubber airbag 302 coaxially sleeved inside the sleeve. The communicating pipe passes through the closing gap in the middle of the rubber airbag. An air nozzle 303 for inflating the rubber airbag is arranged on the sleeve. By adjusting the inflation pressure in the rubber airbag, the holding force on the silica gel communicating pipe can be adjusted. Under normal circumstances, through adjustment, it can be ensured that when the water column in the desorption cylinder is filled to the highest scale line, water will not leak into the measuring cylinder, and at the same time, when air starts to enter the desorption cylinder, the pressure is sufficient to open the holding force of the pinch valve, so that the water in the desorption cylinder can be smoothly pressed into the measuring cylinder. The pinch valve acts as a check valve, and there is residual water in the communicating pipe. At the initial desorption, the water level in the measuring cylinder can be adjusted to its zero scale line by opening the drain valve.

[0042] Specifically, an intake valve 31 is arranged between the bottom of the desorption cylinder and the intake pipe, which can control the intake of the intake pipe of the desorption cylinder by opening and closing. When the coal sample can is connected to the desorption cylinder by a hose and the exhaust angle valve on the top cover of the coal sample can is unscrewed and opened, then opening the intake valve can start the intake of the desorption cylinder. And when there is no air intake in the intake pipe of the desorption cylinder, the intake valve can be timely closed to prevent the water in the desorption cylinder from flowing into the intake pipe or even flowing back to the coal sample can.

[0043] Specifically, a discharge pipe 32 is also connected to the side wall at the bottom of the intake pipe. A discharge valve 33 is installed on the discharge pipe, which can be used for the initial drainage of the top pipe of the coalbed methane in the intake pipe, and also for the dredging and cleaning of the intake pipe and the temporary drainage of the desorption cylinder.

[0044] Specifically, a first ventilation pipe 34 is also connected to the top of the desorption cylinder. A first ventilation valve 35 is arranged in cooperation with the first ventilation pipe. When the first ventilation valve is opened, the desorption cylinder is communicated with the atmosphere, which is used for the breathing exhaust when the water in the measuring cylinder is pressurized and flows back into the desorption cylinder.

[0045] Specifically, the top of the measuring tube is also connected to a second vent pipe 36, and a second vent valve 37 is provided on the second vent pipe. When the second vent valve is opened, the measuring tube is connected to the atmosphere, which is used for air intake of the desorption tube. When the water in the desorption tube enters the measuring tube, the breathing in the measuring tube is exhausted. After a desorption test is completed, the second vent valve on the top of the measuring tube and the first vent valve on the top of the desorption tube can be opened, and then air can be blown toward the second vent valve to blow the water column in the measuring tube back into the desorption tube, and it can be used for the next desorption test cycle.

[0046] Specifically, a water inlet is provided at the top of the water replenishment tank, and a sealing cock 38 is provided on the water inlet in cooperation with a screw thread for adding water to the water replenishment tank. Under normal circumstances, the water in the desorption cylinder and the measuring cylinder can be used back and forth for many times, and generally does not need to be frequently added with water, unless the desorption cylinder or the measuring cylinder needs to be drained, and the total water storage capacity in the desorption cylinder and the measuring cylinder is insufficient, then it is necessary to use the water replenishment tank for standby water replenishment, so the desorption device is very water-saving and can well cope with the situation of water shortage on site.

[0047] The technical solution of the present invention is not limited to the above-mentioned specific embodiments. Without departing from the scope and spirit of the described embodiments, many modifications and changes are obvious to ordinary technicians in this technical field. Any technical deformation made within the spirit and principles of the present invention falls within the protection scope of the present invention.

Claims

1. A coalbed methane desorption device, comprising a base and a desorption cylinder, wherein the bottom of the desorption cylinder is sealed and connected to the upper right part of the base, characterized in that: It also includes a measuring cylinder sealed and connected to the upper left part of the base, both of which are sealed vertical cylindrical measuring cylinders, and the desorption cylinder and the measuring cylinder are connected to each other through a connecting pipe in the middle of the bottom, the right side of the bottom of the desorption cylinder is connected to an air inlet pipe, and the left side of the bottom of the measuring cylinder is connected to a drain pipe, and a drain valve is provided on the drain pipe; a detachable sampling cabin for placing a coal sample tank is provided on the right side of the desorption cylinder; a top cover is sealed and screwed on the top of the coal sample tank, and an exhaust angle valve is provided on the top cover, and the outlet nozzle of the exhaust angle valve is pluggable and connected to the air inlet pipe of the desorption cylinder through a hose, and a temperature and humidity sensor is installed on the air inlet pipe, a radar level gauge is provided on the top of the desorption cylinder, which is used to measure the height of the water level drop inside the desorption cylinder, and an ultrasonic level gauge is provided on the top of the measuring cylinder. A meter is used to measure the rising height of the water level in the measuring cylinder. A differential pressure sensor is also arranged on one side of the top of the desorption cylinder; a digital display cabin is arranged on the left side of the measuring cylinder, a touch display screen is embedded and installed on the upper side wall of the digital display cabin, a single-chip controller is arranged on the inner wall of the digital display cabin, the temperature and humidity sensor, radar level gauge, ultrasonic level gauge, differential pressure sensor and touch display screen are all electrically connected to the single-chip controller, and a rechargeable battery pack for powering various electrical equipment is also arranged in the digital display cabin; a top cabin is also arranged above the desorption cylinder and the measuring cylinder, a water replenishment tank is arranged inside the top cabin, the bottom of the water replenishment tank is connected with the top of the desorption cylinder through a water replenishment pipe, and a water replenishment valve is arranged on the water replenishment pipe; a stopwatch is arranged on the left side of the top cabin, and an empty box barometer is arranged on the right side of the top cabin.

2. A coalbed methane desorption device according to claim 1, characterized in that: An ultrasonic transducer for high-frequency vibration of the coal sample tank is arranged at the bottom of the sampling cabin, an ultrasonic generator connected to the ultrasonic transducer is arranged in the base, and a spring sheet for pressing the coal sample tank is arranged on the top of the sampling cabin.

3. A coalbed methane desorption device according to claim 1, characterized in that: The connecting tube between the desorption cylinder and the measuring cylinder is a silicone tube, and a pinch valve is respectively arranged at both ends of the connecting tube.

4. A coalbed methane desorption device according to claim 1, characterized in that: An air intake valve is arranged between the bottom of the desorption cylinder and the air intake pipe.

5. A coal bed methane desorption device according to claim 1, characterized in that: The bottom side wall of the air inlet pipe is also connected with a discharge pipe, and a discharge valve is installed on the discharge pipe.

6. A coal bed methane desorption device according to claim 1, characterized in that: The top of the desorption cylinder is also connected to a ventilation pipe 1, and a ventilation valve 1 is arranged on the ventilation pipe 1.

7. A coal bed methane desorption device according to claim 1, characterized in that: The top of the measuring cylinder is also connected to a second ventilation pipe, and a second ventilation valve is arranged on the second ventilation pipe.

8. A coal bed methane desorption device according to claim 1, characterized in that: A water inlet is provided on the top of the water replenishment tank, and a sealing cock is provided on the water inlet in cooperation with a screw.

Images