Coal seam gas content one-stop rapid and accurate determination device

Abstract

The application provides a coal seam gas content one-stop rapid and accurate determination device, and belongs to the technical field of coal mine safety. The device comprises a portable granular coal desorption and high-efficiency crushing integrated device and a gas desorption amount automatic determination device. The gas desorption amount automatic determination device automatically measures the desorption amount by using the drainage volume method, so as to avoid manual reading error; the granular coal desorption and high-efficiency crushing integrated device realizes compressed air expansion heat absorption and temperature reduction through double-layer light coal sample tanks and a gas passage, reduces the heat influence in the crushing process, and ensures the measurement accuracy. In the application, the double-layer structure of the desorption amount cylinder avoids bubble interference, the integrated liquid level, temperature and gas pressure sensor realizes automatic determination of environmental parameters, and the accuracy of the desorption amount measurement is improved. The crushing device adopts a high-speed gear type pneumatic motor, is suitable for the high-temperature, high-humidity and dusty environment in the mine, and significantly improves the reliability of the device. Through the application, the one-stop rapid determination of the coal seam gas content in the mine is realized, the data is stable and accurate, and reliable basic data is provided for coal mine gas control, coal bed gas resource utilization and methane emission measurement.

Description

Technical Field

[0001] The present 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 catastrophic gas that causes accidents such as coal and gas outbursts and gas explosions. It is also a high-quality clean energy source, but if not utilized, it is 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, utilizing coalbed methane (gas) resources, and measuring methane emissions. Traditional gas content determination requires taking coal samples underground, sealing the coal samples, and measuring the desorption amount at normal pressure. After the desorption amount is measured underground, the coal samples need to be brought to the surface, crushed in the laboratory, and the crushing desorption amount is measured. The measurement time is long and labor-intensive. The desorption amount measurement requires manual reading, which is highly arbitrary and has large errors.

[0003] In view of this, some scholars have begun to explore the underground integrated measurement technology of coal seam gas content, and have developed an underground compressed air-driven granular coal crushing device, using a flow sensor 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 accuracy of gas content measurement. Secondly, gas mass flow meters have the disadvantages of being difficult to accurately measure the amount of gas micro-desorption, and large measurement errors when the desorption amount fluctuates, which seriously restricts the accurate measurement of coal seam gas content. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to solve the above problems and provide a one-stop rapid and accurate measurement 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 lightweight integrated device for granular coal desorption and high-efficiency crushing, and an automatic gas desorption determination device; the automatic gas desorption determination device utilizes a drainage volume method to determine the gas desorption amount;

[0007] The portable integrated device for desorption and efficient crushing of granular coal includes an air motor, a seal, a light coal sample tank, and a crushing blade. The light coal sample tank has a double-layer structure, with an inner layer being a light thin-walled metal coal sample tank and an outer layer being a non-metallic light protective layer. 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 communicating with the gas channel is provided 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 to the gas desorption amount automatic measuring device;

[0010] The crushing blade is arranged in the lightweight 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 lightweight 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 measuring device includes a desorption measuring cylinder and a liquid level, temperature and pressure integrated wireless sensor;

[0012] The desorption cylinder has a double-layer structure, with a central space and an annular space formed independently of each other 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; an air 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 addition port, 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 addition port 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 calculates the gas desorption amount per unit time 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, thereby realizing the underground one-stop determination of the coal seam gas content; a double-layer lightweight coal sample tank is adopted, and a gas channel is set inside the coal sample tank, and the expansion heat absorption of compressed air is used to cool the coal sample tank, thereby overcoming 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, thus 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, 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 the accurate and automatic measurement 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, objects, and features of the present invention will be described in part in the following description and, in part, will be apparent to those skilled in the art upon examination of the following description or may be learned from practice of the present invention. The objects and other advantages of the present invention may 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 with reference to the accompanying drawings, in which:

[0025] Figure 1 Schematic diagram of the 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- lightweight coal sample tank; 5- crushing blade; 6- lightweight thin-walled metal coal sample barrel; 7- non-metallic lightweight protective layer; 8- pneumatic triplex; 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 and 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 means of 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 are only schematic illustrations of the basic concept of the present invention, and the following embodiments and features in the embodiments can be combined with each other without conflict.

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

[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 there are terms such as "upper", "lower", "left", "right", "front", "back", etc. indicating directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, the terms describing the positional 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 , is a one-stop rapid and accurate device for measuring coal seam gas content, comprising a lightweight integrated device for desorption and efficient crushing of granular coal 1, and an automatic device for measuring gas desorption 21; the automatic device for measuring gas desorption 21 uses a drainage volume method to measure the gas desorption amount; the lightweight integrated device for desorption and efficient crushing of granular coal 1 comprises 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 being a lightweight thin-walled metal coal sample barrel 6, and the outer layer being a non-metallic lightweight protective layer 7, with a gas channel 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, through which the interior of the light-weight thin-walled metal coal sample barrel 6 is connected to the gas desorption amount automatic measuring device 21;

[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. Driven by the pneumatic motor 2, the coal sample in the lightweight thin-walled metal coal sample barrel 6 is crushed, 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 dynamic 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 a 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 by 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; an air 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 addition port 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 addition port 23 is provided at the bottom of the central space 14 and is connected to the central space 14 for adding 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 for discharging water from the desorption measuring cylinder 11;

[0036] The integrated wireless level, temperature, and pressure sensor 12 is mounted on top of the desorption cylinder 11. It measures the liquid level change within the cylinder 11 to calculate the gas desorption rate per unit time. The liquid level measurement in the integrated wireless level, temperature, and pressure sensor 12 uses a magnetostrictive sensor. The measuring rod 15 is located within the central space 14 of the desorption cylinder 11. The housing of the integrated wireless level, temperature, and pressure sensor 12 is equipped with a waterproof vent valve 19, a temperature probe 20, and an atmospheric pressure sensor.

[0037] The present invention adopts a high-speed gear motor to drive a coal sample crushing device, utilizes a drainage volume method to determine the gas desorption amount, and realizes downhole one-stop determination of 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 solutions of the present invention and are not limiting. 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 solutions of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions, which should all 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 by: It includes a portable integrated device for desorption and high-efficiency crushing of granular coal and an automatic device for measuring gas desorption amount; the automatic device for measuring gas desorption amount uses a drainage volume method to measure gas desorption amount; The portable integrated device for desorption and efficient crushing of granular coal includes an air motor, a seal, a light coal sample tank, and a crushing blade. The light coal sample tank has a double-layer structure, with an inner layer being a light thin-walled metal coal sample tank and an outer layer being a non-metallic light protective layer. 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 communicating with the gas channel is provided 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 to the gas desorption amount automatic measuring device; The crushing blade is arranged in the light-weight, 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-weight, thin-walled metal coal sample barrel is crushed under the drive of the pneumatic motor. The desorbed gas enters the gas desorption amount automatic measuring device through the connecting pipe for desorption amount measurement. The gas desorption amount automatic measuring device includes a desorption measuring cylinder and a liquid level, temperature and pressure integrated wireless sensor. The desorption cylinder has a double-layer structure, with a central space and an annular space formed independently of each other 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; an air 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 addition port, 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 addition port 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 calculates the gas desorption amount per unit time by measuring the change of the liquid level in the desorption measuring cylinder.

2. The one-stop rapid and accurate coal seam gas content determination device according to claim 1 is characterized by: 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.

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

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

5. 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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