Coal mine safety production gas early warning device and method

Abstract

The invention provides a coal mine safety production gas early warning device and method, and relates to the technical field of coal mine safety production. The coal mine safety production gas early warning device comprises a gas emission evaluation module, an acoustic emission interference evaluation module and an electromagnetic radiation interference evaluation module. According to the method, the gas emission evaluation coefficient is obtained, whether acoustic emission interference evaluation and electromagnetic radiation interference evaluation are carried out is judged, then the acoustic emission interference evaluation coefficient is obtained based on the acoustic emission stress, and whether acoustic emission interference adjustment is carried out is judged; and finally, obtaining an electromagnetic radiation interference evaluation coefficient according to the sectional area of the gas emission region and the electromagnetic radiation power, and judging whether to carry out electromagnetic radiation interference adjustment, thereby achieving the effect of improving the accuracy of coal and gas outburst early warning, and effectively solving the problem of low accuracy of coal and gas outburst early warning in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mine production safety, and in particular to a coal mine production safety gas early warning device and method. Background Art

[0002] With the continuous growth of global energy demand, the rapid development of the coal industry, as one of the important basic industries, has not only promoted economic growth, but also brought many challenges. Among them, the problem of coal mine gas disasters is particularly prominent, and has long been a major hidden danger to the safe production of the coal industry. Gas disasters, including dynamic disasters such as coal and gas outbursts and rock bursts, not only occur frequently, but are also highly destructive, posing a huge threat to the life safety of coal miners and seriously restricting the sustainable development of the coal industry. Especially in modern coal mines with complex geological conditions and increased mining depth, the superposition of gas disasters and other types of disasters (such as roof collapse, water disasters, etc.) makes the prediction and prevention of disasters more complicated and difficult, posing a severe challenge to deep coal mining. Therefore, the research and development and application of coal mine safety gas early warning technology is particularly important. In recent years, with the continuous development of technologies such as the Internet of Things, big data, and cloud computing, coal mine gas early warning technology has also been continuously upgraded and optimized.

[0003] The existing coal mine safety production gas early warning device determines the danger near the working face by dynamically and continuously monitoring certain indicators that can comprehensively reflect the mechanical state of the gas-containing coal body.

[0004] However, in the process of implementing the technical solution of the present invention, the present invention finds that the above technology has at least the following technical problems:

[0005] In the existing technology, due to the increase in mining depth, dynamic disasters such as coal and gas outbursts and rock bursts are becoming more and more serious. This may cause interference to the sensors during the monitoring process, resulting in insufficient comprehensive reflection of ground stress, gas and coal-rock mechanical properties, and thus resulting in low accuracy of coal and gas outburst warning. Summary of the invention

[0006] The present invention provides a coal mine safety production gas early warning device and method, which obtains the gas outburst assessment coefficient and determines whether to perform acoustic emission interference assessment and electromagnetic radiation interference assessment, then obtains the acoustic emission interference assessment coefficient based on the acoustic emission stress, determines whether to perform acoustic emission interference adjustment based on the acoustic emission interference assessment coefficient, and finally obtains the electromagnetic radiation interference assessment coefficient through the cross-sectional area and electromagnetic radiation power of the gas outburst area, determines whether to perform electromagnetic radiation interference adjustment based on the electromagnetic radiation interference assessment coefficient, and improves the accuracy of coal and gas outburst early warning. The technical scheme is as follows:

[0007] A gas early warning device for safe production in coal mines comprises a gas outburst assessment module, an acoustic emission interference assessment module and an electromagnetic radiation interference assessment module: wherein the gas outburst assessment module is used to obtain a gas outburst assessment coefficient by means of the obtained cross-sectional area of ​​the gas outburst area and gas outburst related data, and judge whether to perform acoustic emission interference assessment and electromagnetic radiation interference assessment according to the gas outburst assessment coefficient, and the gas outburst assessment coefficient is used to assess the compliance degree of gas outburst in an excavation working face; the acoustic emission interference assessment module is used to obtain an acoustic emission interference assessment coefficient based on acoustic emission stress, and judge whether to perform acoustic emission interference adjustment based on the acoustic emission interference assessment coefficient, and the acoustic emission interference assessment coefficient is used to assess the interference degree of gas outburst in an excavation working face on acoustic emission; the electromagnetic radiation interference assessment module is used to obtain an electromagnetic radiation interference assessment coefficient by means of the obtained cross-sectional area of ​​the gas outburst area and the electromagnetic radiation power, and judge whether to perform electromagnetic radiation interference adjustment based on the electromagnetic radiation interference assessment coefficient, and the electromagnetic radiation interference assessment coefficient is used to assess the interference degree of gas outburst in an excavation working face on electromagnetic radiation.

[0008] Optionally, the gas outburst related data include gas pressure difference, coal seam gas content and coal seam mining depth; the coal seam gas content is obtained by actual measurement by preset personnel; the cross-sectional area of ​​the gas outburst area is obtained by a gas sensor and a wind speed sensor; the gas pressure difference is represented by the difference between the gas pressure at a preset position point inside a preset area of ​​the excavation working face and the gas pressure outside the preset area of ​​the excavation working face; the acoustic emission stress is obtained by an acoustic emission instrument; the electromagnetic radiation power is obtained by an electromagnetic radiation sensor.

[0009] Optionally, the specific process of obtaining the gas outburst assessment coefficient by obtaining the cross-sectional area of ​​the gas outburst area and the gas outburst related data is as follows: the initial gas outburst volume is obtained by multiplying the permeability coefficient, the gas pressure difference and the cross-sectional area of ​​the gas outburst area; the outburst volume deviation ratio is obtained by performing a ratio operation on the initial gas outburst volume and a preset maximum outburst volume threshold obtained from the database; the gas content deviation ratio is obtained by performing a ratio operation on the coal seam gas content and the preset maximum gas content threshold obtained from the database; the coal seam mining depth is obtained by performing a ratio operation on the preset maximum mining depth threshold obtained from the database to obtain the coal seam mining depth deviation ratio; and the gas outburst assessment coefficient is obtained by combining the outburst volume deviation ratio, the gas content deviation ratio and the coal seam mining depth deviation ratio.

[0010] Optionally, the limiting expression of the gas emission assessment coefficient is as follows:

[0011]

[0012] In the formula, It represents the gas emission assessment coefficient of the rth preset time point for monitoring the excavation working face, r=1,2,...,d, r represents the number of the preset time point, d represents the total number of preset time points, YC r It represents the outflow deviation ratio at the rth preset time point of monitoring the excavation working face, HL r It represents the gas content deviation ratio at the rth preset time point of monitoring the excavation working face, SD r It represents the coal seam mining depth deviation ratio at the rth preset time point for monitoring the excavation working face, H r Indicates the coal seam mining depth at the rth preset time point for monitoring the excavation working face, ΔP r represents the gas pressure difference at the rth preset time point of monitoring the excavation working face, s r HW represents the cross-sectional area of ​​the gas outburst area at the rth preset time point when monitoring the excavation working face. r represents the gas content of the coal seam at the rth preset time point monitored on the excavation working face, k represents the permeability coefficient, YC 0 max Indicates the preset maximum outflow threshold, HL 0 max Indicates the preset maximum threshold of gas content, SD 0 max represents the preset maximum mining depth threshold, and e represents a natural constant.

[0013] Optionally, the specific process of obtaining the acoustic emission interference assessment coefficient based on acoustic emission stress is as follows: obtain the stress deviation ratio, which is represented by the result of a ratio operation between the acoustic emission stress and a preset stress maximum threshold obtained from a database, and the stress deviation ratio is used to reflect the deviation of the sound wave release of the excavation working face under stress during the monitoring of the excavation working face; obtain the acoustic emission interference assessment coefficient by combining the first acoustic emission interference weight, the second acoustic emission interference weight, a gas outburst assessment coefficient not less than a preset gas outburst maximum value, and the stress deviation ratio.

[0014] Optionally, the specific process of obtaining the electromagnetic radiation interference assessment coefficient by obtaining the cross-sectional area of ​​the gas outburst area and the electromagnetic radiation power is as follows: obtaining an initial radiation intensity value by performing a ratio operation on the electromagnetic radiation power and the cross-sectional area of ​​the gas outburst area, and the initial radiation intensity value is used to reflect the propagation of electromagnetic waves during the monitoring of the excavation working face; obtaining a radiation intensity deviation ratio by performing a ratio operation on the initial radiation intensity value and a preset radiation intensity maximum threshold obtained from a database, and the radiation intensity deviation ratio is used to reflect the deviation of electromagnetic wave propagation during the monitoring of the excavation working face; obtaining the electromagnetic radiation interference assessment coefficient by combining the gas outburst assessment coefficient that is not less than the preset gas outburst maximum value and the radiation intensity deviation ratio.

[0015] The embodiment of the present invention provides a coal mine production safety gas early warning method, comprising the following steps: obtaining a gas outburst assessment coefficient by obtaining a gas outburst area cross-sectional area and gas outburst related data, judging whether to perform acoustic emission interference assessment and electromagnetic radiation interference assessment according to the gas outburst assessment coefficient, wherein the gas outburst assessment coefficient is used to evaluate the compliance degree of gas outburst at an excavation working face; obtaining an acoustic emission interference assessment coefficient based on acoustic emission stress, judging whether to perform acoustic emission interference adjustment based on the acoustic emission interference assessment coefficient, wherein the acoustic emission interference assessment coefficient is used to evaluate the interference degree of gas outburst at an excavation working face on acoustic emission; obtaining an electromagnetic radiation interference assessment coefficient by obtaining a gas outburst area cross-sectional area and electromagnetic radiation power, judging whether to perform electromagnetic radiation interference adjustment based on the electromagnetic radiation interference assessment coefficient, wherein the electromagnetic radiation interference assessment coefficient is used to evaluate the interference degree of gas outburst at an excavation working face on electromagnetic radiation.

[0016] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0017] 1. By obtaining the gas outburst assessment coefficient and judging whether to conduct acoustic emission interference assessment and electromagnetic radiation interference assessment, then obtaining the acoustic emission interference assessment coefficient based on the acoustic emission stress and judging whether to conduct acoustic emission interference adjustment, and finally obtaining the electromagnetic radiation interference assessment coefficient by obtaining the cross-sectional area and electromagnetic radiation power of the gas outburst area and judging whether to conduct electromagnetic radiation interference adjustment, the accurate quantification of the coal mine safety production gas early warning process is achieved, and then the accuracy of coal and gas outburst early warning is improved, which effectively solves the problem of low accuracy of coal and gas outburst early warning in the existing technology.

[0018] 2. The gas emission assessment coefficient is obtained through the deviation ratio of the emission volume, the deviation ratio of the gas content and the deviation ratio of the coal seam mining depth. Then, the acoustic emission interference assessment coefficient is obtained by combining the first acoustic emission interference weight, the second acoustic emission interference weight, the gas emission assessment coefficient not less than the preset maximum gas emission value and the stress deviation ratio. Finally, the electromagnetic radiation interference assessment coefficient is obtained by combining the gas emission assessment coefficient not less than the preset maximum gas emission value and the radiation intensity deviation ratio, thereby achieving the improvement of the accuracy of the data related to the coal mine safety production gas early warning, and then achieving the improvement of the reliability of the coal mine safety production gas early warning.

[0019] 3. By judging the electromagnetic radiation interference assessment coefficient and the preset electromagnetic radiation interference maximum value obtained from the database, when the electromagnetic radiation interference assessment coefficient is not higher than the preset electromagnetic radiation interference maximum value, a normal electromagnetic radiation interference prompt is sent to the preset personnel, otherwise data smoothing is performed and the position of the electromagnetic radiation sensor is adjusted, thereby achieving an improvement in the accuracy of evaluating the degree of interference of gas outburst on electromagnetic radiation from the excavation working face, and then achieving an improvement in the reliability of evaluating the degree of interference of gas outburst on electromagnetic radiation from the excavation working face. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 A schematic diagram of the structure of a coal mine safety production gas early warning device provided by an embodiment of the present invention;

[0022] Figure 2 An overall flow chart provided for an embodiment of the present invention;

[0023] Figure 3 A statistical diagram of changes in the acoustic emission interference assessment coefficient provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one", "one" or "the" do not indicate a quantitative limitation, but indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0026] It should be noted that the terms "up", "down", "left", "right", "front", "back", etc. used in the present invention are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0027] The technical solution in the embodiment of the present invention is to solve the problem of low accuracy of the above-mentioned coal and gas outburst warning. The overall idea is as follows:

[0028] By obtaining the gas outburst assessment coefficient and judging whether to perform acoustic emission interference assessment and electromagnetic radiation interference assessment, then obtaining the acoustic emission interference assessment coefficient based on the acoustic emission stress and judging whether to perform acoustic emission interference adjustment, and finally obtaining the electromagnetic radiation interference assessment coefficient by obtaining the cross-sectional area and electromagnetic radiation power of the gas outburst area and judging whether to perform electromagnetic radiation interference adjustment, the effect of improving the accuracy of coal and gas outburst early warning is achieved.

[0029] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0030] like Figure 1As shown, it is a structural schematic diagram of a coal mine safety production gas early warning device provided by an embodiment of the present invention, including a gas outburst assessment module, an acoustic emission interference assessment module and an electromagnetic radiation interference assessment module: wherein the gas outburst assessment module is used to obtain a gas outburst assessment coefficient by obtaining the cross-sectional area of ​​the gas outburst area and gas outburst related data, and judge whether to perform acoustic emission interference assessment and electromagnetic radiation interference assessment according to the gas outburst assessment coefficient, and the gas outburst assessment coefficient is used to evaluate the compliance degree of gas outburst in the excavation working face; the acoustic emission interference assessment module is used to obtain an acoustic emission interference assessment coefficient based on acoustic emission stress, and judge whether to perform acoustic emission interference adjustment based on the acoustic emission interference assessment coefficient, and .... The emission interference assessment coefficient is used to assess the interference degree of gas outburst on acoustic emission from the excavation working face, and the acoustic emission interference adjustment is used to adjust the acoustic emission interference assessment coefficient to no higher than the preset acoustic emission interference maximum value obtained from the database; the electromagnetic radiation interference assessment module is used to obtain the electromagnetic radiation interference assessment coefficient by obtaining the cross-sectional area and electromagnetic radiation power of the gas outburst area, and determine whether to perform electromagnetic radiation interference adjustment based on the electromagnetic radiation interference assessment coefficient. The electromagnetic radiation interference assessment coefficient is used to assess the interference degree of gas outburst on electromagnetic radiation from the excavation working face, and the electromagnetic radiation interference adjustment is used to adjust the electromagnetic radiation interference assessment coefficient to no higher than the preset electromagnetic radiation interference maximum value obtained from the database.

[0031] In this embodiment, if Figure 2 As shown, it is an overall flow chart provided by an embodiment of the present invention. The gas outburst assessment coefficient, the acoustic emission interference assessment coefficient and the electromagnetic radiation interference assessment coefficient do not exist independently, but are interrelated. When the mining depth increases, the gas outburst volume may increase, which will further cause stress changes in the coal seam, thereby increasing the acoustic emission events, and then increasing the acoustic emission interference assessment coefficient. The increase in the gas outburst assessment coefficient may be accompanied by the enhancement of electromagnetic radiation in the coal seam, because the release and flow of gas may change the electromagnetic field in the coal seam, thereby increasing the electromagnetic radiation interference assessment coefficient. Acoustic emission and electromagnetic radiation are both important precursor information in the process of coal and gas outburst. The increase in acoustic emission events may be associated with the enhancement of electromagnetic radiation, because they are all caused by physical changes in the coal seam, such as coal rock fracture and gas release; the accuracy of coal and gas outburst warning is improved.

[0032] It should be added that gas exists in the coal body or surrounding rock in a free state and a absorbed state. The free gas in the cracks and pores of the coal seam has molecular thermal motion, which will generate pressure after impact. Due to the influence of mining, the original state of the coal rock layer is destroyed, the permeability increases, and the free gas rushes to the mining space under pressure to form gas outburst. Coal and gas outburst is a very harmful dynamic phenomenon in coal mine production. During the mining and production process, a large amount of coal and gas suddenly erupts from the coal (rock) body in a very short time, accompanied by strong dynamic phenomena; gas outburst related data include gas pressure difference, coal seam gas content and coal seam mining depth; coal seam gas content is obtained through actual measurement by preset personnel; the cross-sectional area of ​​the gas outburst area is obtained through gas sensors and wind speed sensors; the preset position inside the preset area of ​​the excavation working face is obtained through pressure sensors. The preset position point outside the preset area of ​​the excavation working face represents the position point set by the preset personnel outside the roadway, and the preset position point inside the preset area of ​​the excavation working face represents the position point set by the preset personnel inside the roadway. The gas pressure difference is represented by the difference between the gas pressure of the preset position point inside the preset area of ​​the excavation working face and the gas pressure outside the preset area of ​​the excavation working face; the acoustic emission stress is obtained by the acoustic emission instrument; the electromagnetic radiation power is obtained by the electromagnetic radiation sensor.

[0033] Specifically, a pressure sensor and a wind speed sensor are installed at a preset position point outside the preset area of ​​the excavation working face and a preset position point inside the preset area of ​​the excavation working face. The preset position point outside the preset area of ​​the excavation working face and the preset position point inside the preset area of ​​the excavation working face are in a one-to-one correspondence. The real-time gas pressure of the preset position point inside the preset area of ​​the excavation working face and the preset position point outside are measured by the pressure sensor, thereby obtaining a real-time gas pressure difference. The wind speed sensor is used to measure the wind flow speed of the preset position point inside the preset area of ​​the excavation working face and the preset position point outside the preset area, and the air density is obtained from the database, without considering the preset position point inside the preset area of ​​the excavation working face and the preset position point outside. The height difference of the preset position points is calculated, and the cross-sectional area of ​​the gas outburst area is obtained by the Bernoulli equation. The gas sensor is installed at the preset position point inside the preset area of ​​the tunneling working face, and the preset personnel measure the coal seam gas content at the preset position point inside the preset area of ​​the tunneling working face in real time. The electromagnetic radiation sensor measures the electromagnetic radiation power at the preset position point inside the preset area of ​​the tunneling working face in real time, and the acoustic emission sensor is installed at the preset position point outside the preset area of ​​the tunneling working face. The acoustic emission stress at the preset position point outside the preset area of ​​the tunneling working face is measured in real time by the acoustic emission instrument. The depth of coal seam mining is determined by the preset personnel; the accuracy of coal and gas outburst warning is improved.

[0034] Optionally, the specific process of obtaining the gas outflow assessment coefficient by using the obtained gas outflow area cross-sectional area and gas outflow related data is as follows: an initial gas outflow volume is obtained by multiplying the permeability coefficient, the gas pressure difference and the gas outflow area cross-sectional area, and the initial gas outflow volume is used to reflect the gas outflow situation during the monitoring of the excavation working face; a gas outflow volume deviation ratio (i.e., YC in the restriction expression of the gas outflow assessment coefficient) is obtained by performing a ratio operation between the initial gas outflow volume and a preset maximum outflow volume threshold value obtained from the database. r ), the gas emission deviation ratio is used to reflect the deviation of gas emission during the monitoring of the excavation working face; the gas content deviation ratio (i.e., the HL in the limiting expression of the gas emission assessment coefficient) is obtained by performing a ratio calculation between the coal seam gas content and the preset gas content maximum threshold obtained from the database. r ), the gas content deviation ratio is used to reflect the deviation of the gas content in the preset area of ​​the coal seam during the monitoring of the excavation working face; the coal seam mining depth deviation ratio (i.e., SD in the limiting expression of the gas emission assessment coefficient) is obtained by calculating the ratio between the coal seam mining depth and the preset mining depth maximum threshold obtained from the database. r ), the coal seam mining depth deviation ratio is used to reflect the deviation of the coal seam mining depth in the preset area during the monitoring of the excavation working face; the gas emission deviation ratio, the gas content deviation ratio and the coal seam mining depth deviation ratio are combined to obtain the gas emission assessment coefficient; the permeability coefficient, the preset maximum emission threshold, the preset maximum gas content threshold and the preset maximum mining depth threshold are obtained from the database.

[0035] Specifically, the specific process of determining whether to conduct acoustic emission interference assessment and electromagnetic radiation interference assessment based on the gas outflow assessment coefficient is as follows: the first step is to determine whether the gas outflow assessment coefficient is not lower than the preset gas outflow maximum value obtained from the database. If so, execute the second step, otherwise execute the third step; the second step is to obtain a gas outflow assessment coefficient that is not lower than the preset gas outflow maximum value, and send a prompt to the preset personnel to conduct acoustic emission interference assessment and electromagnetic radiation interference assessment; the third step is to send a gas outflow normal prompt to the preset personnel.

[0036] Among them, the limiting expression of the gas outburst assessment coefficient is as follows:

[0037]

[0038] In the formula, It represents the gas emission assessment coefficient of the rth preset time point for monitoring the excavation working face, r=1,2,...,d, r represents the number of the preset time point, d represents the total number of preset time points, YC r It represents the outflow deviation ratio at the rth preset time point of monitoring the excavation working face, HL rIt represents the gas content deviation ratio at the rth preset time point of monitoring the excavation working face, SD r It represents the coal seam mining depth deviation ratio at the rth preset time point for monitoring the excavation working face, H r Indicates the coal seam mining depth at the rth preset time point for monitoring the excavation working face, ΔP r represents the gas pressure difference at the rth preset time point of monitoring the excavation working face, s r HW represents the cross-sectional area of ​​the gas outburst area at the rth preset time point when monitoring the excavation working face. r represents the gas content of the coal seam at the rth preset time point monitored on the excavation working face, k represents the permeability coefficient, YC 0 max Indicates the preset maximum outflow threshold, HL 0 max Indicates the preset maximum threshold of gas content, SD 0 max represents the preset maximum mining depth threshold, and e represents a natural constant.

[0039] In this embodiment, the algorithm of this embodiment combines the cross-sectional area of ​​the gas emission area and the gas emission related data for comprehensive analysis to obtain the gas emission assessment coefficient. In the algorithm of this embodiment, the cross-sectional area of ​​the gas emission area and the gas emission related data do not exist independently, but are interrelated. The greater the mining depth, the larger the exposure surface, the higher the gas pressure, and the greater the gas emission volume. The change in gas pressure difference directly affects the fluidity and emission volume of gas, thereby affecting the gas emission assessment coefficient. The increase in the cross-sectional area of ​​the gas emission area will lead to an increase in the gas emission volume, which in turn affects the gas emission assessment coefficient. The increase in the gas content of the coal seam will directly lead to an increase in the gas emission volume. The parameters of the algorithm of this embodiment need to be considered together and at the same time to affect the results.

[0040] It should be understood that the aforementioned database is a database for storing various types of setting data established before the construction of a coal mine safety production gas early warning device provided by an embodiment of the present invention. The database includes but is not limited to coal seam permeability coefficient, coal seam gas outburst volume, coal seam gas content, and coal seam mining depth. Various values ​​therein are directly set by technical personnel. For example, the permeability coefficient is represented by the average value of coal seam permeability coefficient data in the historical time period in the database, the preset maximum threshold of outburst volume is represented by the average value of coal seam gas outburst volume data in the historical time period in the database, the preset maximum threshold of gas content is represented by the average value of coal seam gas content data in the historical time period in the database, the preset maximum threshold of mining depth is represented by the average value of coal seam mining depth data in the historical time period in the database, and the preset maximum value of gas outburst is represented by the average value of gas outburst assessment coefficient in the historical time period in the database. In addition, various values ​​in the database can be set and fine-tuned by technical personnel according to actual debugging.

[0041] Specifically, assuming that the outflow deviation ratio YC r The range is 0.1-1, and the gas content deviation is HL r The range is 0.1-1, and the coal seam mining depth deviation ratio SD r The range is 0.1-1, as shown in Table 1, which is a statistical table of changes in the gas emission assessment coefficient provided in an embodiment of the present invention:

[0042] Table 1 Statistics of changes in gas emission assessment coefficient

[0043]

[0044] From the above table, we can see that as the outflow deviation ratio YC r , gas content deviation ratio HL r and coal seam mining depth deviation ratio SD r The gas outburst assessment coefficient gradually increases, which means that the gas outburst situation is gradually serious, and the interference compliance degree of acoustic emission and electromagnetic radiation is gradually increased; the accurate quantification of the gas outburst compliance degree of the excavation working face is achieved, thereby improving the accuracy of coal and gas outburst early warning.

[0045] Optionally, the specific process of obtaining the acoustic emission interference evaluation coefficient based on the acoustic emission stress is as follows: obtain the stress deviation ratio (i.e., E in the restriction expression of the acoustic emission interference evaluation coefficient) r), the stress deviation ratio is represented by the result of the ratio operation between the acoustic emission stress and the preset maximum stress threshold value obtained from the database, and the stress deviation ratio is used to reflect the deviation of the acoustic wave release of the excavation working face under the action of stress during the monitoring of the excavation working face; the acoustic emission interference assessment coefficient is obtained by combining the first acoustic emission interference weight, the second acoustic emission interference weight, the gas outburst assessment coefficient not less than the preset gas outburst maximum value and the stress deviation ratio; the first acoustic emission interference weight, the second acoustic emission interference weight and the preset maximum stress threshold value are obtained from the database; the first acoustic emission interference weight is used to evaluate the influence of the stress of the excavation working face on the acoustic emission interference assessment coefficient; the second acoustic emission interference weight is used to evaluate the influence of the gas outburst assessment coefficient not less than the preset gas outburst maximum value on the acoustic emission interference assessment coefficient.

[0046] Among them, the limiting expression of the acoustic emission interference evaluation coefficient is as follows:

[0047]

[0048] In the formula, represents the acoustic emission interference assessment coefficient at the rth preset time point for monitoring the excavation working face, r = 1, 2, ..., d, r represents the number of the preset time point, d represents the total number of preset time points, It represents the gas emission assessment coefficient that is not less than the preset gas emission maximum value at the rth preset time point of monitoring the excavation working face, E r It represents the stress deviation ratio of the rth preset time point for monitoring the excavation working face, YL r represents the acoustic emission stress at the rth preset time point of monitoring the excavation working face, E 0 max represents the preset maximum stress threshold, γ 1 represents the first acoustic emission interference weight, γ 2 represents the second acoustic emission interference weight, and e represents a natural constant.

[0049] It should be added that the preset maximum stress threshold is represented by the average value of the coal seam stress data in the historical time period in the database; specifically, the sum of the first acoustic emission interference weight and the second acoustic emission interference weight is 1, for example, the first acoustic emission interference weight is 0.5, and the preset second traceability accurate allocation weight is 0.5; the first acoustic emission interference weight is the weight corresponding to the preset coal seam stress value in the database, which represents the influence of the coal seam stress value on the acoustic emission interference assessment coefficient. When used, the weight corresponding to the preset coal seam stress value can be directly obtained from the database, and the corresponding relationship can be a pre-set mapping relationship. For example, the coal seam stress in the gas concentration warning training set and the weight corresponding to the preset coal seam stress value in the database form a mapping set, and the real-time coal seam stress is input into the mapping set to obtain the corresponding weight, and the mapping relationship can be a one-to-one correspondence or a many-to-one relationship. In this example, its value range is [0, 1].

[0050] It should be understood that the algorithm of this embodiment combines the acoustic emission stress and the gas outburst assessment coefficient for comprehensive analysis to obtain the acoustic emission interference assessment coefficient. In the algorithm of this embodiment, the acoustic emission stress and the gas outburst assessment coefficient do not exist independently, but are interrelated. When the coal rock mass is subjected to a greater load, the acoustic emission activity is enhanced, and the gas outburst may also increase, because the rupture of the coal rock mass will release gas. The increase in gas outburst may also cause changes in the stress state of the coal rock mass, thereby affecting the intensity and frequency of the acoustic emission activity. This in turn affects the acoustic emission interference assessment coefficient, and the parameters of the algorithm of this embodiment need to be considered together and at the same time to affect the results.

[0051] Specifically, assuming that the stress deviation ratio E r The gas outflow assessment coefficient ranges from 0.1 to 0.5 and is not less than the preset maximum gas outflow value. The range is 0.1-0.5, and the first acoustic emission interference weight γ 1 is 0.5, the second acoustic emission interference weight γ 2 is 0.5, such as Figure 3 As shown, it is a statistical diagram of the change of the acoustic emission interference evaluation coefficient provided by the embodiment of the present invention. Figure 3 It can be seen that when the gas outburst assessment coefficient is not less than the preset gas outburst maximum value When the stress deviation ratio E is fixed at 0.1, r The gradual increase of the acoustic emission interference assessment coefficient means that the interference degree of gas outburst in the excavation working face on the acoustic emission is gradually enhanced; the accurate quantification of the interference degree of gas outburst in the excavation working face on the acoustic emission is achieved, thereby improving the accuracy of coal and gas outburst warning.

[0052] Optionally, the specific process of judging whether to adjust the acoustic emission interference based on the acoustic emission interference assessment coefficient is as follows: SK1, judging whether the acoustic emission interference assessment coefficient is not higher than the preset acoustic emission interference maximum value obtained from the database, if so, sending an acoustic emission interference normal prompt to the preset personnel, otherwise executing SK2; SK2, removing the noise generated by the gas outflow through the signal enhancement algorithm, when the monitored acoustic emission interference assessment coefficient is not higher than the preset acoustic emission interference maximum value, stop adjusting the acoustic emission interference, otherwise execute SK3; SK3, sending a prompt to the preset personnel to adjust the position of the acoustic emission sensor, when the monitored acoustic emission interference assessment coefficient is not higher than the preset acoustic emission interference maximum value, stop adjusting the acoustic emission interference, otherwise send an alarm prompt to the preset personnel.

[0053] In this embodiment, the preset maximum value of acoustic emission interference is represented by the average value of the acoustic emission interference evaluation coefficient of the historical time period in the database. Changing the preset position point of the deployed acoustic emission sensor (for example, sending a prompt to the preset personnel to switch the acoustic emission sensor to a different preset position point) can avoid information redundancy and can more accurately capture the acoustic emission signal. The signal enhancement algorithm plays a vital role in reducing interference in acoustic emission monitoring. The signal enhancement algorithm includes an adaptive filtering algorithm, a wavelet analysis method, etc. For example, the noise is separated by wavelet analysis to achieve signal denoising and feature extraction; the accuracy of coal and gas outburst warning is improved.

[0054] Optionally, the specific process of obtaining the electromagnetic radiation interference assessment coefficient by obtaining the cross-sectional area of ​​the gas outburst area and the electromagnetic radiation power is as follows: an initial radiation intensity value is obtained by performing a ratio operation on the electromagnetic radiation power and the cross-sectional area of ​​the gas outburst area, and the initial radiation intensity value is used to reflect the propagation of electromagnetic waves during the monitoring of the excavation working face; a radiation intensity deviation ratio (i.e., I in the limiting expression of the electromagnetic radiation interference assessment coefficient) is obtained by performing a ratio operation on the initial radiation intensity value and a preset radiation intensity maximum threshold value obtained from a database. r ), the radiation intensity deviation ratio is used to reflect the deviation of electromagnetic wave propagation during the monitoring of the excavation working face; the electromagnetic radiation interference assessment coefficient is obtained by combining the gas outburst assessment coefficient not less than the preset maximum gas outburst value and the radiation intensity deviation ratio; the preset maximum radiation intensity threshold is obtained from the database.

[0055] Among them, the limiting expression of the electromagnetic radiation interference evaluation coefficient is as follows:

[0056]

[0057] In the formula, represents the electromagnetic radiation interference evaluation coefficient of the rth preset time point for monitoring the excavation working face, r=1,2,...,d, r represents the number of the preset time point, d represents the total number of preset time points, It represents the gas emission assessment coefficient that is not less than the preset gas emission maximum value at the rth preset time point of monitoring the excavation working face, I r It represents the radiation intensity deviation ratio at the rth preset time point of monitoring the excavation working face, s r FG represents the cross-sectional area of ​​the gas outburst area at the rth preset time point for monitoring the excavation working face. r represents the electromagnetic radiation power at the rth preset time point for monitoring the excavation working face, I 0 max represents the preset maximum threshold of radiation intensity, and e represents a natural constant.

[0058] In this embodiment, the preset maximum threshold of radiation intensity is represented by the average value of electromagnetic radiation intensity data of coal seams in historical time periods in the database. The algorithm of this embodiment combines the cross-sectional area of ​​the gas outburst area, the electromagnetic radiation power and the gas outburst assessment coefficient to obtain the electromagnetic radiation interference assessment coefficient. In the algorithm of this embodiment, the cross-sectional area of ​​the gas outburst area, the electromagnetic radiation power and the gas outburst assessment coefficient are not independent, but have mutual correlation. The larger the cross-sectional area, the more gas can be released from the coal seam, which will increase the gas outburst assessment coefficient and the electromagnetic radiation interference assessment coefficient, because the more gas released, the more electromagnetic radiation events may be caused. The increase in radiation power may mean an increase in gas outburst amount and gas outburst assessment coefficient, which in turn affects the electromagnetic radiation interference assessment coefficient. The increase in electromagnetic radiation power indicates that the release of energy inside the coal seam has increased, which may be related to the flow and release of gas, thereby affecting the electromagnetic radiation intensity. The parameters of the algorithm of this embodiment need to consider the impact on the results together; the accurate quantification of the interference degree of gas outburst in the excavation working face on electromagnetic radiation is achieved, thereby improving the accuracy of coal and gas outburst warning.

[0059] Optionally, the specific process of judging whether to adjust the electromagnetic radiation interference based on the electromagnetic radiation interference evaluation coefficient is as follows: SG1, judging whether the electromagnetic radiation interference evaluation coefficient is not higher than the preset electromagnetic radiation interference maximum value obtained from the database, if so, sending an electromagnetic radiation interference normal prompt to the preset personnel, otherwise executing SG2; SG2, performing data smoothing, when the monitored electromagnetic radiation interference evaluation coefficient is not higher than the preset electromagnetic radiation interference maximum value, stopping the electromagnetic radiation interference adjustment, otherwise executing SG3, data smoothing means reducing the noise caused by the fluctuation of the gas outflow airflow through the Kalman filtering method; SG3, sending a prompt to the preset personnel to adjust the position of the electromagnetic radiation sensor, when the monitored electromagnetic radiation interference evaluation coefficient is not higher than the preset electromagnetic radiation interference maximum value, stopping the electromagnetic radiation interference adjustment, otherwise sending an alarm prompt to the preset personnel.

[0060] In this embodiment, the preset maximum value of electromagnetic radiation interference is represented by the average value of the electromagnetic radiation interference evaluation coefficient of the historical time period in the database. Changing the preset position point of the deployed electromagnetic radiation sensor (for example, sending a prompt to the preset personnel to switch the electromagnetic radiation sensor to a different preset position point) can move away from the noise source and capture the electromagnetic radiation signal more accurately. By smoothing the data using the Kalman filtering method, the noise caused by the fluctuation of the gas outflow airflow can be reduced, thereby improving the accuracy of the electromagnetic radiation interference evaluation coefficient; the accuracy of coal and gas outburst warning is improved.

[0061] The embodiment of the present invention provides a coal mine safety production gas early warning method, comprising the following steps: gas outburst assessment: obtaining a gas outburst assessment coefficient by obtaining the cross-sectional area of ​​the gas outburst area and gas outburst related data, judging whether to perform acoustic emission interference assessment and electromagnetic radiation interference assessment according to the gas outburst assessment coefficient, and the gas outburst assessment coefficient is used to evaluate the compliance degree of gas outburst in the excavation working face; acoustic emission interference assessment: obtaining an acoustic emission interference assessment coefficient based on acoustic emission stress, judging whether to perform acoustic emission interference adjustment based on the acoustic emission interference assessment coefficient, and the acoustic emission interference assessment coefficient is used to evaluate the gas outburst in the excavation working face. The interference degree to acoustic emission is evaluated, and the acoustic emission interference adjustment is used to adjust the acoustic emission interference assessment coefficient to no higher than the preset acoustic emission interference maximum value obtained from the database; Electromagnetic radiation interference assessment: the electromagnetic radiation interference assessment coefficient is obtained by obtaining the cross-sectional area of ​​the gas outburst area and the electromagnetic radiation power, and whether to perform electromagnetic radiation interference adjustment is determined based on the electromagnetic radiation interference assessment coefficient. The electromagnetic radiation interference assessment coefficient is used to evaluate the interference degree of gas outburst in the excavation working face on electromagnetic radiation, and the electromagnetic radiation interference adjustment is used to adjust the electromagnetic radiation interference assessment coefficient to no higher than the preset electromagnetic radiation interference maximum value obtained from the database.

[0062] In this embodiment, the potential interference of gas outburst in the excavation working face on acoustic emission and electromagnetic radiation is comprehensively evaluated through gas outburst assessment, acoustic emission interference assessment and electromagnetic radiation interference assessment to ensure the safe and stable operation of the coal mine, which is of great significance for improving the safety and efficiency of coal mining; and the accuracy of coal and gas outburst warning is improved.

[0063] There are a few points to note:

[0064] (1) The drawings of the embodiments of the present invention only relate to the structures related to the embodiments of the present invention, and other structures may refer to the general design.

[0065] (2) For the sake of clarity, in the drawings used to describe the embodiments of the present invention, the thickness of the layers or regions is exaggerated or reduced, that is, these drawings are not drawn according to the actual scale. It is understood that when an element such as a layer, film, region or substrate is referred to as being "on" or "under" another element, the element may be "directly" "on" or "under" the other element or there may be intermediate elements.

[0066] (3) In the absence of conflict, the embodiments of the present invention and the features therein may be combined with each other to obtain new embodiments.

[0067] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. The protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A coal mine safety production gas early warning device, characterized in that: Including gas outburst assessment module, acoustic emission interference assessment module and electromagnetic radiation interference assessment module: The gas outburst assessment module is used to obtain a gas outburst assessment coefficient by obtaining the cross-sectional area of ​​the gas outburst area and gas outburst related data, and to determine whether to perform acoustic emission interference assessment and electromagnetic radiation interference assessment according to the gas outburst assessment coefficient. The gas outburst assessment coefficient is used to assess the compliance degree of gas outburst in the excavation working face; The acoustic emission interference assessment module is used to obtain an acoustic emission interference assessment coefficient based on the acoustic emission stress, and to determine whether to perform acoustic emission interference adjustment based on the acoustic emission interference assessment coefficient, wherein the acoustic emission interference assessment coefficient is used to assess the degree of interference of gas outburst on acoustic emission at the excavation working face; The electromagnetic radiation interference assessment module is used to obtain the electromagnetic radiation interference assessment coefficient by obtaining the cross-sectional area and electromagnetic radiation power of the gas outburst area, and to determine whether to perform electromagnetic radiation interference adjustment based on the electromagnetic radiation interference assessment coefficient. The electromagnetic radiation interference assessment coefficient is used to assess the degree of interference of gas outburst in the excavation working face on electromagnetic radiation.

2. The coal mine safety production gas early warning device according to claim 1 is characterized in that: The gas emission related data include gas pressure difference, coal seam gas content and coal seam mining depth; The coal seam gas content is obtained through actual measurement by preset personnel; The cross-sectional area of ​​the gas outflow region is obtained through a gas sensor and a wind speed sensor; The gas pressure difference is represented by the difference between the gas pressure at a preset position point inside the preset area of ​​the excavation working face and the gas pressure outside the preset area of ​​the excavation working face; The acoustic emission stress is obtained by an acoustic emission instrument; The electromagnetic radiation power is acquired by an electromagnetic radiation sensor.

3. The coal mine safety production gas early warning device according to claim 2 is characterized in that: The specific process of obtaining the gas outburst assessment coefficient by obtaining the gas outburst area cross-sectional area and gas outburst related data is as follows: The initial gas outflow volume is obtained by multiplying the permeability coefficient, gas pressure difference and cross-sectional area of ​​the gas outflow area; The gas outflow deviation ratio is obtained by performing a ratio calculation between the initial gas outflow and the preset maximum outflow threshold value obtained from the database; The gas content deviation ratio is obtained by performing ratio calculation between the coal seam gas content and a preset gas content maximum threshold value obtained from a database; The coal seam mining depth deviation ratio is obtained by performing a ratio calculation between the coal seam mining depth and a preset mining depth maximum threshold value obtained from a database; The gas emission assessment coefficient is obtained by combining the emission volume deviation ratio, gas content deviation ratio and coal seam mining depth deviation ratio.

4. The coal mine safety production gas early warning device according to claim 3 is characterized in that: The limiting expression of the gas burst assessment coefficient is as follows: In the formula, It represents the gas emission assessment coefficient of the rth preset time point for monitoring the excavation working face, r=1,2,...,d, r represents the number of the preset time point, d represents the total number of preset time points, YC r It represents the outflow deviation ratio at the rth preset time point of monitoring the excavation working face, HL r It represents the gas content deviation ratio at the rth preset time point of monitoring the excavation working face, SD r It represents the coal seam mining depth deviation ratio at the rth preset time point for monitoring the excavation working face, H r Indicates the coal seam mining depth at the rth preset time point for monitoring the excavation working face, ΔP r represents the gas pressure difference at the rth preset time point of monitoring the excavation working face, s r HW represents the cross-sectional area of ​​the gas outburst area at the rth preset time point when monitoring the excavation working face. r represents the gas content of the coal seam at the rth preset time point monitored on the excavation working face, k represents the permeability coefficient, YC 0 max Indicates the preset maximum outflow threshold, HL 0 max Indicates the preset maximum threshold of gas content, SD 0 max represents the preset maximum mining depth threshold, and e represents a natural constant.

5. The coal mine safety production gas early warning device according to claim 4 is characterized in that: The specific process of judging whether to conduct acoustic emission interference assessment and electromagnetic radiation interference assessment according to the gas outburst assessment coefficient is as follows: The first step is to determine whether the gas emission assessment coefficient is not lower than the preset gas emission maximum value obtained from the database. If so, the second step is executed, otherwise the third step is executed. The second step is to obtain a gas outflow assessment coefficient that is not less than the preset gas outflow maximum value, and send a prompt to the preset personnel to conduct acoustic emission interference assessment and electromagnetic radiation interference assessment; The third step is to send a normal gas outflow notification to the preset personnel.

6. The coal mine safety production gas early warning device according to claim 2 is characterized in that: The specific process of obtaining the acoustic emission interference assessment coefficient based on acoustic emission stress is as follows: Obtaining a stress deviation ratio, wherein the stress deviation ratio is represented by a result of a ratio calculation between the acoustic emission stress and a preset maximum stress threshold value obtained from a database, and the stress deviation ratio is used to reflect the deviation of the acoustic wave release of the excavation working face under the action of stress during the monitoring of the excavation working face; The acoustic emission interference assessment coefficient is obtained by combining the first acoustic emission interference weight, the second acoustic emission interference weight, a gas outflow assessment coefficient not less than a preset gas outflow maximum value, and a stress deviation ratio.

7. The coal mine safety production gas early warning device according to claim 6 is characterized in that: The specific process of judging whether to perform acoustic emission interference adjustment based on the acoustic emission interference evaluation coefficient is as follows: SK1, judge whether the acoustic emission interference assessment coefficient is not higher than the preset acoustic emission interference maximum value obtained from the database. If so, send an acoustic emission interference normal prompt to the preset personnel, otherwise execute SK2; SK2, remove the noise generated by gas outflow. When the monitored acoustic emission interference assessment coefficient is not higher than the preset acoustic emission interference maximum value, stop adjusting the acoustic emission interference. Otherwise, execute SK3. SK3, sends a reminder to the preset personnel to adjust the position of the acoustic emission sensor. When the monitored acoustic emission interference evaluation coefficient is not higher than the preset acoustic emission interference maximum value, stop adjusting the acoustic emission interference. Otherwise, send an alarm to the preset personnel.

8. The coal mine safety production gas early warning device according to claim 2 is characterized in that: The specific process of obtaining the electromagnetic radiation interference assessment coefficient by obtaining the cross-sectional area and electromagnetic radiation power of the gas outburst area is as follows: An initial radiation intensity value is obtained by performing a ratio operation between the electromagnetic radiation power and the cross-sectional area of ​​the gas outburst region, and the initial radiation intensity value is used to reflect the propagation of electromagnetic waves during the monitoring of the excavation working face; The radiation intensity deviation ratio is obtained by performing a ratio operation between the initial radiation intensity value and the preset maximum radiation intensity threshold obtained from the database, and the radiation intensity deviation ratio is used to reflect the deviation of electromagnetic wave propagation during the monitoring of the excavation working face; The electromagnetic radiation interference assessment coefficient is obtained by combining the gas outflow assessment coefficient that is not less than the preset gas outflow maximum value and the radiation intensity deviation ratio.

9. The coal mine safety production gas early warning device according to claim 8, characterized in that: The specific process of judging whether to adjust the electromagnetic radiation interference based on the electromagnetic radiation interference evaluation coefficient is as follows: SG1, judge whether the electromagnetic radiation interference assessment coefficient is not higher than the preset electromagnetic radiation interference maximum value obtained from the database. If so, send an electromagnetic radiation interference normal prompt to the preset personnel, otherwise execute SG2; SG2, perform data smoothing processing. When the monitored electromagnetic radiation interference assessment coefficient is not higher than the preset electromagnetic radiation interference maximum value, stop the electromagnetic radiation interference adjustment. Otherwise, execute SG3; SG3, sends a reminder to the preset personnel to adjust the position of the electromagnetic radiation sensor. When the monitored electromagnetic radiation interference evaluation coefficient is not higher than the preset electromagnetic radiation interference maximum value, stop adjusting the electromagnetic radiation interference. Otherwise, send an alarm reminder to the preset personnel.

10. A coal mine safety production gas early warning method, characterized in that: The following steps are involved: A gas outburst assessment coefficient is obtained by obtaining the cross-sectional area of ​​the gas outburst area and gas outburst related data, and whether to conduct an acoustic emission interference assessment and an electromagnetic radiation interference assessment is determined according to the gas outburst assessment coefficient. The gas outburst assessment coefficient is used to assess the compliance degree of gas outburst in the excavation working face; Acquiring an acoustic emission interference assessment coefficient based on the acoustic emission stress, and judging whether to perform acoustic emission interference adjustment based on the acoustic emission interference assessment coefficient, wherein the acoustic emission interference assessment coefficient is used to assess the interference degree of gas outburst on acoustic emission at the excavation working face; The electromagnetic radiation interference assessment coefficient is obtained by obtaining the cross-sectional area of ​​the gas outburst area and the electromagnetic radiation power. Based on the electromagnetic radiation interference assessment coefficient, it is determined whether to perform electromagnetic radiation interference adjustment. The electromagnetic radiation interference assessment coefficient is used to evaluate the degree of interference of gas outburst in the excavation working face on electromagnetic radiation.

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