Coal mine underground roadway full-section average gas concentration and concentration distribution determination method

Abstract

The invention relates to a coal mine underground roadway full-section average gas concentration and concentration distribution determination method, which comprises the following steps of: mounting a methane remote measuring instrument on the side wall of a roadway, and equally dividing the roadway section into a plurality of sub-areas according to an angle alpha by taking the remote measuring instrument as a center; and starting from the 0-degree position, the methane telemeter rotates by taking an angle alpha as a unit, and the methane concentration at the corresponding angle position is measured one by one, so that the average concentration of each sub-region is obtained. The average gas concentration of the whole section of the roadway is obtained through weighted average calculation of the areas of all the sub-regions. A laser distance measuring sensor is integrated on the methane remote measuring instrument to measure the wall surface distance of a roadway in real time, so that the area of each sub-region is accurately calculated. According to the method, the problem of measuring the full-section gas concentration and distribution of the roadway is solved, and comprehensive and accurate monitoring of the gas concentration is realized. The method has the advantages of improving data representativeness, solving the problem of inaccurate measurement of roadway section gas distribution, providing a high-precision weighted average result and the like, is suitable for roadway sections of different shapes and sizes, and can provide important data support for coal mine gas control and ventilation system optimization.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mining and coal mine safety, and relates to a method for measuring the average gas concentration and concentration distribution of a full-section of an underground coal mine tunnel. Background Art

[0002] Coal is the "ballast stone" of my country's energy security. However, my country's shallow coal resources are almost exhausted, and deep mining has gradually become the mainstream of my country's coal resource development. The characteristics of high gas, high stress and low permeability in deep coal seam mining are further highlighted. In recent decades, my country's coal mining technology and equipment have developed rapidly, and the mining intensity has been further increased. Under high-intensity mining, the amount of gas outflow is large, and gas control is difficult. In addition, methane is recognized as the second largest greenhouse gas, accounting for about 18% of the global greenhouse effect. The energy industry is the largest source of methane emissions in my country, accounting for about 46% of emissions, and coal mine methane accounts for 89% of methane emissions in the energy industry.

[0003] Gas emission is the basic data for predicting the danger of gas outburst in working face, optimizing ventilation design, and measuring methane emission. Accurately measuring gas emission is of great significance for guiding coal mine safety production and measuring methane emission in underground coal mines. At present, most of the gas emission monitoring sensors in mine tunnels are point sensors. One sensor can only measure the gas concentration at a certain point, and cannot measure the average methane concentration on the tunnel section. Summary of the invention

[0004] In view of this, the purpose of the present invention is to solve the above-mentioned problems and provide a method for measuring the average gas concentration and concentration distribution of the entire cross-section of an underground coal mine tunnel.

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

[0006] A method for measuring the average gas concentration and concentration distribution of the entire cross-section of an underground coal mine tunnel is provided. A methane telemeter is installed on the side wall of the tunnel. The tunnel cross-section is divided into N sub-areas according to the segmentation angle α with the methane telemeter as the center point. The area corresponding to the i-th sub-area is A. i , the methane telemeter is rotated from 0° to an angle α, and the average methane concentration C corresponding to the angle position is measured at each rotation. i and the average methane concentration C i As the average methane concentration in the i-th sub-area, the gas concentration distribution is obtained;

[0007] Tunnel cross-sectional area The average methane concentration C of the entire tunnel section is calculated using weighted average,

[0008]

[0009] Furthermore, the area of ​​the sub-area is calculated as follows: the installation height of the methane telemeter is L1, and the distance between the methane telemeter and the tunnel wall when it is at the 0° position is L1, then Each time the methane telemeter rotates a unit angle, the corresponding distance from the tunnel wall is L. i , then the approximate method is used to calculate the area corresponding to the i-th sub-region

[0010] Furthermore, a laser distance measuring sensor is integrated on the methane telemeter, and the distance between the methane telemeter and the tunnel wall is measured by the laser distance measuring sensor.

[0011] Furthermore, the angle α is less than 10°.

[0012] The beneficial effects of the present invention are:

[0013] 1. Existing gas concentration monitoring methods mostly rely on point sensors, which can only measure the gas concentration of a single point in the tunnel, and it is difficult to accurately reflect the gas concentration distribution of the entire tunnel section. However, the present invention divides the tunnel section into several sub-areas, gradually measures the gas concentration in each area, and can obtain the concentration data of the entire tunnel section and calculate the average concentration of the entire section. This full-section measurement method effectively improves the representativeness of the concentration data, making the measurement results closer to the actual gas concentration distribution of the tunnel section, and providing more guiding data for coal mine safety management.

[0014] 2. The present invention can effectively identify the uneven distribution of gas concentration by dividing the tunnel section into multiple sub-areas and independently measuring the methane concentration in each area. The gas concentration may fluctuate in different areas or even form local accumulation. The measurement method of the present invention can show the distribution of gas concentration in detail and provide a basis for ventilation design and gas control solutions. For example, the air volume distribution of the ventilation system can be adjusted according to the concentration differences in different areas, so as to control the gas concentration more efficiently.

[0015] 3. The present invention adopts the weighted average method to calculate the average gas concentration of the entire section, that is, the overall average concentration is obtained by weighting the concentration values ​​of each sub-area by area, avoiding the error that may be caused by simple arithmetic average. The weighted average method can more truly reflect the concentration status in the tunnel section, making the calculation result more scientific and reasonable.

[0016] 4. The segmentation method and measurement steps of the present invention are highly flexible and can be adjusted according to the size and shape of the actual tunnel section. For example, the segmentation angle α can be set according to factors such as the tunnel width and shape to ensure the rationality of the segmentation area, thereby improving the measurement accuracy. Therefore, the present invention is not only applicable to standard tunnels, but also to irregular or special-shaped tunnels, and has wide applicability and is easy to promote.

[0017] 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

[0018] 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:

[0019] Figure 1 It is a schematic diagram of the method for measuring the average gas concentration and concentration distribution of the entire cross-section of an underground coal mine tunnel in the present invention. DETAILED DESCRIPTION

[0020] 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.

[0021] 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.

[0022] 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.

[0023] Please refer to Figure 1 , is a method for measuring the average gas concentration and concentration distribution of the entire cross-section of a coal mine tunnel. A methane telemeter 1 is installed on the side wall of the tunnel. The tunnel cross-section is divided into N sub-areas according to the segmentation angle α with the methane telemeter 1 as the center point. The angle α is less than 10°. The area corresponding to the i-th sub-area is A i , the methane telemeter is rotated from 0° to an angle α, and the average methane concentration C corresponding to the angle position is measured at each rotation. i and the average methane concentration C i As the average methane concentration in the i-th sub-area, the gas concentration distribution is obtained;

[0024] Tunnel cross-sectional area The average methane concentration C of the entire tunnel section is calculated using weighted average,

[0025]

[0026] Among them, the methane telemeter 1 is integrated with a laser ranging sensor, and the distance between the methane telemeter and the tunnel wall is measured by the laser ranging sensor. The area calculation method of the sub-area is that the installation height of the methane telemeter is L1, and the distance between the methane telemeter and the tunnel wall when it is at the 0° position is L1, then Each time the methane telemeter rotates a unit angle, the corresponding distance from the tunnel wall is L. i , then the approximate method is used to calculate the area corresponding to the i-th sub-region

[0028] The specific implementation steps are as follows:

[0029] S1: Determine the tunnel section division angle α;

[0030] S2: Measure the distance L1 between the pan / tilt of the methane telemeter and the tunnel wall;

[0031] S3: The methane telemeter installed on the explosion-proof pan / tilt rotates from 0° to a fixed angle α;

[0032] S4: The methane telemeter completes the measurement of the distance L2 between the PTZ and the wall and the average methane concentration C1;

[0033] S5: Calculate the area swept by the methane telemeter when it rotates from 0° to a fixed angle α Then the methane concentration on area A1 is C1;

[0034] S6: The methane telemeter rotates to the next angle α, and the area A2 swept by the methane telemeter and the methane concentration C2 on the area A2 are completed, and the measurement of the tunnel section is completed in the same way;

[0035] S7: Calculate the cross-sectional area of ​​the tunnel Average methane concentration of the entire tunnel section

[0036] 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 method for measuring the average gas concentration and concentration distribution of a full-section of a coal mine tunnel, characterized in that: The methane telemeter is installed on the side wall of the tunnel. Taking the methane telemeter as the center point, the tunnel section is divided into N sub-areas according to the segmentation angle α. The area corresponding to the i-th sub-area is A. i , the methane telemeter is rotated from 0° to an angle α, and the average methane concentration C corresponding to the angle position is measured at each rotation. i and the average methane concentration C i As the average methane concentration in the i-th sub-area, the gas concentration distribution is obtained; Tunnel cross-sectional area The average methane concentration C of the entire tunnel section is calculated using weighted average, 2. The method for measuring the average gas concentration and concentration distribution of the entire cross-section of a coal mine tunnel according to claim 1, characterized in that: The area of ​​the sub-area is calculated as follows: the installation height of the methane telemeter is L1, and the distance between the methane telemeter and the tunnel wall when it is at the 0° position is L1, then Each time the methane telemeter rotates a unit angle, the corresponding distance from the tunnel wall is L. i , then the approximate method is used to calculate the area corresponding to the i-th sub-region 3. The method for measuring the average gas concentration and concentration distribution of the entire cross-section of a coal mine tunnel according to claim 2, characterized in that: The methane telemeter is integrated with a laser distance sensor, and the distance between the methane telemeter and the tunnel wall is measured by the laser distance sensor.

4. The method for measuring the average gas concentration and concentration distribution of the entire cross-section of a coal mine tunnel according to claim 1, characterized in that: The angle α is smaller than 10°.

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