One-stop rapid and accurate measuring device for coal seam gas content

Abstract

The invention provides a one-stop rapid and accurate measuring device for coal seam gas content, and belongs to the technical field of coal mine safety. The device comprises a portable granular coal desorption and efficient crushing integrated device and a gas desorption amount automatic measuring device. The automatic gas desorption amount measuring device adopts a drainage volumetric method to automatically measure the desorption amount, so that manual reading errors are avoided; according to the granular coal desorption and efficient crushing integrated device, compressed air expansion, heat absorption and cooling are achieved through the double-layer light coal sample tank and the gas channel, the heat influence in the crushing process is reduced, and the measurement precision is ensured. According to the invention, the double-layer structure of the desorption measuring cylinder avoids bubble interference, the liquid level, temperature and air pressure integrated sensor realizes automatic measurement of environmental parameters, and the accuracy of desorption amount measurement is improved. And the crushing device adopts a high-speed gear type pneumatic motor and adapts to underground high-temperature, high-humidity and dust environments, so that the reliability of the device is remarkably improved. According to the invention, the underground one-stop rapid measurement of the coal seam gas content is realized, the data is stable and accurate, and reliable basic data is provided for coal mine gas treatment, coal seam gas resource utilization and methane emission metering.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mining and coal mine safety, and relates to a one-stop rapid and accurate determination device for coal seam gas content. Background Art

[0002] Coal mine gas is a disastrous gas that causes coal and gas outbursts, gas explosions and other accidents. It is also a high-quality clean energy. If it is not used, it will be a source of greenhouse gas pollution. The gas content of coal seams is the basic data for predicting the amount of gas outburst in mines, formulating scientific and reasonable gas disaster prevention and control measures, coalbed methane (gas) resource utilization, and methane emission measurement. Traditional gas content determination requires taking coal samples underground, sealing the coal samples and measuring the desorption amount at normal pressure. After the underground desorption amount is determined, the coal samples need to be carried to the ground, crushed in the laboratory, and the crushing desorption amount is measured. The measurement time is long and the labor intensity is high. The desorption amount determination requires manual reading, which is very random and has large errors.

[0003] In view of this, some scholars began to explore the underground integrated measurement technology of coal seam gas content, and developed an underground compressed air-driven granular coal crushing device, using flow sensors to measure the gas desorption amount. However, the existing underground granular coal high-efficiency crushing devices all use vane-type pneumatic motors. Affected by environmental factors such as high temperature, high humidity, and heavy dust underground, the vane-type pneumatic motor has poor reliability and is prone to sparks when the blades rub against the motor housing. More importantly, a large amount of heat is generated during the coal sample crushing process, causing the internal temperature of the crushing device to increase sharply, and the internal gas to expand, affecting the measurement accuracy of the gas content. Secondly, the gas mass flowmeter has the disadvantages of being difficult to accurately measure the micro-desorption of gas, and large measurement errors when the desorption amount fluctuates, which seriously restricts the accurate measurement of the gas content in the coal seam. Summary of the invention

[0004] In view of this, the purpose of the present invention is to solve the above-mentioned problem and provide a one-stop rapid and accurate determination device for coal seam gas content.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] A one-stop rapid and accurate coal seam gas content determination device, comprising a portable particle coal desorption and high-efficiency crushing integrated device, and a gas desorption amount automatic determination device; the gas desorption amount automatic determination device determines the gas desorption amount by using a drainage volume method;

[0007] The portable integrated device for desorption and efficient crushing of granular coal comprises a pneumatic motor, a seal, a light coal sample tank, and a crushing blade; the light coal sample tank is a double-layer structure, the inner layer is a light thin-walled metal coal sample tank, the outer layer is a non-metallic light protective layer, and a gas channel is provided between the light thin-walled metal coal sample tank and the non-metallic light protective layer;

[0008] A compressed air inlet connected to the gas channel is arranged on the side of the non-metallic lightweight protective layer, and compressed air is introduced into the gas channel to cool the lightweight thin-walled metal coal sample barrel by utilizing the expansion heat absorption of the compressed air;

[0009] The upper part of the light-weight thin-walled metal coal sample barrel is provided with an upper cover, and the upper cover is provided with a connecting pipe, through which the interior of the light-weight thin-walled metal coal sample barrel is connected with the gas desorption amount automatic measuring device;

[0010] The crushing blade is arranged in the light thin-walled metal coal sample barrel and is connected to the output shaft of the pneumatic motor through a seal. The coal sample in the light thin-walled metal coal sample barrel is crushed under the drive of the pneumatic motor, and the desorbed gas enters the gas desorption amount automatic measuring device through the connecting pipe for desorption amount measurement.

[0011] Furthermore, the gas desorption amount automatic determination device comprises a desorption measuring cylinder and a liquid level temperature and pressure integrated wireless sensor;

[0012] The desorption cylinder is a double-layer structure, and a central space and annular space that are independent of each other are formed by a partition; a water level balance hole is provided at the bottom of the partition to connect the central space with the annular space; a pressure balance hole is provided at the top of the partition to connect the central space with the annular space; a desorption gas inlet, a water inlet, and a drain port are provided at the bottom of the desorption cylinder, and the desorption gas inlet is connected to the bottom of the annular space; the connecting pipe is connected to the desorption gas inlet; the water inlet is provided at the bottom of the central space and is connected to the central space for adding water to the desorption cylinder; the drain port is connected to the bottom of the central space or the annular space for draining water from the desorption cylinder;

[0013] The liquid level, temperature and pressure integrated wireless sensor is arranged on the top of the desorption measuring cylinder, and the gas desorption amount per unit time is calculated by measuring the change of the liquid level in the desorption measuring cylinder.

[0014] Furthermore, the liquid level measurement in the liquid level, temperature and pressure integrated wireless sensor adopts a sensor based on the magnetostrictive principle, and the measuring rod is arranged in the central space of the desorption cylinder; the shell of the liquid level, temperature and pressure integrated wireless sensor is provided with a waterproof breathable valve, a temperature probe and an atmospheric pressure sensor.

[0015] Furthermore, the pneumatic motor is a high-speed gear-type pneumatic motor, and the sealing element is a low-resistance rotary dynamic sealing element.

[0016] Furthermore, an ash-isolating baffle and a powder metallurgy sheet are provided on the upper cover of the light coal sample tank to prevent the crushed fly ash from entering the automatic gas desorption amount measuring device.

[0017] Furthermore, the crushing blade is a single-layer 4-wing blade.

[0018] The beneficial effects of the present invention are:

[0019] 1. The present invention adopts a high-speed gear motor to drive the coal sample crushing device, and uses the drainage volume method to determine the gas desorption amount, so as to realize the underground one-stop determination of the gas content of the coal seam; a double-layer light coal sample tank is adopted, and a gas channel is arranged inside the coal sample tank, and the expansion heat absorption of compressed air is used to cool the coal sample tank, so as to overcome the influence of heat generated when the blade rotates to break the coal on the measurement accuracy of the gas desorption amount.

[0020] 2. The present invention adopts a magnetostrictive liquid level gauge and integrates ambient temperature and atmospheric pressure sensors to realize automatic measurement of drainage volume, ambient temperature and atmospheric pressure without manual reading, thereby realizing accurate automatic measurement of gas desorption amount.

[0021] 3. The present invention adopts a double-layer desorption measuring cylinder, and the gas enters from the annular space of the desorption measuring cylinder, thereby avoiding the generation of bubbles in the desorption center space and eliminating the influence of bubbles on the measurement accuracy of the drainage volume.

[0022] 4. The present invention realizes accurate and automatic determination of coal seam gas content, providing reliable basic data for coal mine gas control, coal seam gas (gas) resource utilization and methane emission measurement.

[0023] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0025] Figure 1 It is a schematic diagram of a one-stop rapid and accurate determination device for coal seam gas content in the present invention.

[0026] Figure numerals: 1- lightweight integrated device for desorption and efficient crushing of granular coal; 2- pneumatic motor; 3- seal; 4- light coal sample tank; 5- crushing blade; 6- light thin-walled metal coal sample barrel; 7- non-metallic lightweight protective layer; 8- pneumatic triplet; 9- ash baffle; 10- powder metallurgy sheet; 11- desorption measuring cylinder; 12- liquid level temperature and pressure integrated wireless sensor; 13- annular space; 14- central space; 15- measuring rod; 16- desorption gas inlet; 17- drain outlet; 18- connecting pipe; 19- waterproof breathable valve; 20- temperature probe; 21- gas desorption amount automatic measuring device; 22- compressed air inlet; 23- water inlet; 24- water level balance hole; 25- air pressure balance hole. DETAILED DESCRIPTION

[0027] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0028] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0029] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0030] Please refer to Figure 1 , which is a one-stop rapid and accurate determination device for coal seam gas content, including a lightweight granular coal desorption and high-efficiency crushing integrated device 1, and a gas desorption amount automatic determination device 21; the gas desorption amount automatic determination device 21 uses a drainage volume method to determine the gas desorption amount; the lightweight granular coal desorption and high-efficiency crushing integrated device 1 includes an air motor 2, a seal 3, a lightweight coal sample tank 4, and a crushing blade 5; the lightweight coal sample tank 4 is a double-layer structure, the inner layer is a lightweight thin-walled metal coal sample barrel 6, and the outer layer is a non-metallic lightweight protective layer 7, and a gas channel is provided between the lightweight thin-walled metal coal sample barrel 6 and the non-metallic lightweight protective layer 7;

[0031] A compressed air inlet 22 connected to the gas channel is provided on the side of the non-metallic lightweight protective layer 7. By introducing compressed air into the gas channel, the expansion heat absorption of the compressed air is utilized to cool the lightweight thin-walled metal coal sample barrel 6.

[0032] The upper part of the light-weight thin-walled metal coal sample barrel 6 is provided with an upper cover, and the upper cover is provided with a connecting pipe 18, and the interior of the light-weight thin-walled metal coal sample barrel 6 is connected with the gas desorption amount automatic measuring device 21 through the connecting pipe 18;

[0033] The crushing blade 5 is installed in a lightweight thin-walled metal coal sample barrel 6 and is connected to the output shaft of the pneumatic motor through a seal 3. The coal sample in the lightweight thin-walled metal coal sample barrel 6 is crushed under the drive of the pneumatic motor 2, and the desorbed gas enters the gas desorption amount automatic measuring device 21 through the connecting pipe 18 for desorption amount measurement.

[0034] The pneumatic motor 2 is a high-speed gear-type pneumatic motor 2, and the seal 3 is a low-resistance rotary seal 3. The crushing blade 5 is a single-layer 4-wing blade. The pneumatic motor 2 and the compressed air inlet 22 are connected to the compressed air pipeline through the pneumatic triplet 8.

[0035] In this embodiment, the gas desorption amount automatic measuring device 21 includes a desorption measuring cylinder 11 and a liquid level temperature and pressure integrated wireless sensor 12; the desorption measuring cylinder 11 is a double-layer structure, and a central space 14 and annular space 13 are formed independently of each other through a partition; a water level balance hole 24 is provided at the bottom of the partition to connect the central space 14 with the annular space 13; a pressure balance hole 25 is provided at the top of the partition to connect the central space 14 with the annular space 13; a desorption gas inlet 16, a water inlet 23, and a drain port 17 are provided at the bottom of the desorption measuring cylinder 11, and the desorption gas inlet 16 is connected to the bottom of the annular space 13; a connecting pipe 18 is connected to the desorption gas inlet 16; the water inlet 23 is provided at the bottom of the central space 14 and is connected to the central space 14, and is used to add water to the desorption measuring cylinder 11; the drain port 17 is connected to the bottom of the central space 14 or the annular space 13, and is used to discharge water from the desorption measuring cylinder 11;

[0036] The liquid level, temperature and pressure integrated wireless sensor 12 is installed on the top of the desorption cylinder 11, and the gas desorption amount per unit time is calculated by measuring the liquid level change in the desorption cylinder 11. The liquid level measurement in the liquid level, temperature and pressure integrated wireless sensor 12 adopts a sensor based on the magnetostrictive principle, and the measuring rod 15 is arranged in the central space 14 of the desorption cylinder 11; the shell of the liquid level, temperature and pressure integrated wireless sensor 12 is provided with a waterproof and breathable valve 19, a temperature probe 20 and an atmospheric pressure sensor.

[0037] The invention adopts a high-speed gear motor to drive a coal sample crushing device, and uses a drainage volume method to determine the gas desorption amount, thereby realizing a one-stop underground determination of the coal seam gas content.

[0038] An ash-isolating baffle 9 and a powder metallurgy sheet 10 are provided on the upper cover of the light coal sample tank 4 to prevent the pulverized fly ash from entering the gas desorption automatic measuring device 21 .

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A one-stop rapid and accurate device for measuring coal seam gas content, characterized in that: It includes a portable integrated device for desorption and high-efficiency crushing of granular coal and an automatic device for measuring the amount of gas desorption; the automatic device for measuring the amount of gas desorption uses a drainage volume method to measure the amount of gas desorption; The portable integrated device for desorption and efficient crushing of granular coal comprises a pneumatic motor, a seal, a light coal sample tank, and a crushing blade; the light coal sample tank is a double-layer structure, the inner layer is a light thin-walled metal coal sample tank, the outer layer is a non-metallic light protective layer, and a gas channel is provided between the light thin-walled metal coal sample tank and the non-metallic light protective layer; A compressed air inlet connected to the gas channel is arranged on the side of the non-metallic lightweight protective layer, and compressed air is introduced into the gas channel to cool the lightweight thin-walled metal coal sample barrel by utilizing the expansion heat absorption of the compressed air; The upper part of the light-weight thin-walled metal coal sample barrel is provided with an upper cover, and the upper cover is provided with a connecting pipe, through which the interior of the light-weight thin-walled metal coal sample barrel is connected with the gas desorption amount automatic measuring device; The crushing blade is arranged in the light thin-walled metal coal sample barrel and is connected to the output shaft of the pneumatic motor through a seal. The coal sample in the light thin-walled metal coal sample barrel is crushed under the drive of the pneumatic motor, and the desorbed gas enters the gas desorption amount automatic measuring device through the connecting pipe for desorption amount measurement.

2. The one-stop rapid and accurate coal seam gas content determination device according to claim 1 is characterized in that: The gas desorption amount automatic measuring device comprises a desorption measuring cylinder and a liquid level temperature and pressure integrated wireless sensor; The desorption cylinder is a double-layer structure, and a central space and annular space that are independent of each other are formed by a partition; a water level balance hole is provided at the bottom of the partition to connect the central space with the annular space; a pressure balance hole is provided at the top of the partition to connect the central space with the annular space; a desorption gas inlet, a water inlet, and a drain port are provided at the bottom of the desorption cylinder, and the desorption gas inlet is connected to the bottom of the annular space; the connecting pipe is connected to the desorption gas inlet; the water inlet is provided at the bottom of the central space and is connected to the central space for adding water to the desorption cylinder; the drain port is connected to the bottom of the central space or the annular space for draining water from the desorption cylinder; The liquid level, temperature and pressure integrated wireless sensor is arranged on the top of the desorption measuring cylinder, and the gas desorption amount per unit time is calculated by measuring the change of the liquid level in the desorption measuring cylinder.

3. The one-stop rapid and accurate coal seam gas content determination device according to claim 2 is characterized in that: The liquid level measurement in the liquid level temperature and pressure integrated wireless sensor adopts a sensor based on the magnetostrictive principle, and the measuring rod is arranged in the central space of the desorption cylinder; the shell of the liquid level temperature and pressure integrated wireless sensor is provided with a waterproof breathable valve, a temperature probe and an atmospheric pressure sensor.

4. The one-stop rapid and accurate coal seam gas content determination device according to claim 1 is characterized in that: The pneumatic motor is a high-speed gear-type pneumatic motor, and the sealing element is a low-resistance rotary dynamic sealing element.

5. The one-stop rapid and accurate coal seam gas content determination device according to claim 1 is characterized in that: An ash-isolating baffle and a powder metallurgy sheet are provided on the upper cover of the light coal sample tank, which are used to prevent the crushed fly ash from entering the automatic measuring device for gas desorption.

6. The one-stop rapid and accurate coal seam gas content determination device according to claim 1 is characterized in that: The crushing blade is a single-layer 4-wing blade.

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