CN110985129B - Coal and gas outburst catastrophe identification method for coal mining working face - Google Patents

Abstract

The invention belongs to the field of coal mine safety, and relates to a coal and gas outburst disaster judgment method for a coal mine excavation working face, which comprises the following steps of a, acquiring gas concentration, wind speed and wind direction data of the excavation working face and a return airway of a mining area where the excavation working face is located through a methane sensor, a wind speed sensor and a wind direction sensor; b. and judging the coal and gas outburst according to the abnormal change characteristics of the gas concentration, the wind speed and the wind direction data at different positions of the working surface. On one hand, the method can realize the identification of coal and gas outburst catastrophe only by using the abnormal change characteristics of the existing sensor monitoring data in the underground coal mine without adding any sensor in the underground coal mine, and has low investment cost; on the other hand, the technical identification method has strong operability and reliable identification result, can timely judge the time and the place of coal and gas outburst catastrophe, effectively reduce the false alarm rate, facilitate time control and disaster reduction, avoid secondary disasters and reduce casualties and economic loss.

Description

Coal and gas outburst catastrophe identification method for coal mining working face

Technical Field

The invention belongs to the field of coal mine safety, and relates to a coal and gas outburst catastrophe identification method for a coal mine excavation working face.

Background

China is the most serious country of coal and gas outburst (abbreviated as outburst) in the world. With the continuous increase of mining depth and mining intensity, China is in a period of high risk, and accidents happen frequently. Since 2015, the number of outbreaks and the number of dead people in coal mines in China are on the level of 5 to more than 25, and the number of the outbreaks and the number of the dead people in coal mines in individual years even rebound. The disaster threat to the safety production of a plurality of coal mines in China is highlighted, and the disaster prevention and control system is a key focus of disaster prevention and control and emergency control.

Coal and gas outbursts are extremely destructive. When the outburst happens, a large amount of coal, rock and gas can be thrown out to the excavation space instantly, huge impact force is achieved, facility equipment can be destroyed, operators can be buried, and the ventilation system can be destroyed, wind current can be caused to flow reversely by the large amount of gas gushed instantly, high-concentration gas enters other areas to cause suffocation of the people, and even secondary disasters such as gas explosion or gas combustion are caused, and larger loss is caused.

The working face is the main place where coal mine coal and gas outburst occurs, and over 99% of coal and gas outburst accidents occur on the working face. Therefore, the method has important significance for accurately judging the coal and gas outburst catastrophe of the excavation working face in time, accurately taking emergency control measures for the coal mine to compete for precious emergency rescue time, avoiding secondary disasters such as gas explosion, gas combustion and the like, reducing personnel injury and property loss and the like.

Disclosure of Invention

In view of the above, the present invention provides a method for identifying coal and gas outburst in a coal mining face, which can avoid secondary disasters such as gas explosion and gas combustion, and reduce personal injury and property loss.

In order to achieve the purpose, the invention provides the following technical scheme: the disaster judgment method for coal and gas outburst on the coal mining working face comprises

a. Collecting gas concentration, wind speed and wind direction data of a mining working face and a return airway of a mining area where the mining working face is located through a methane sensor, a wind speed sensor and a wind direction sensor;

b. judging coal and gas outburst according to the abnormal change characteristics of the gas concentration, the wind speed and the wind direction data at different positions of the working surface;

when the working face in step b is a coal face, step b includes

b11. High-low concentration or full-range methane sensor T arranged on coal face_{1 mining}The high-low concentration or full-range methane sensor T is arranged on the return airway of the coal face_{2 mining}The methane sensor T is arranged in the air intake tunnel of the coal face_{3 mining}The wind speed sensor F is arranged on the return airway of the coal face_{1 mining}The wind direction sensor F is arranged on the air intake tunnel of the coal face_{X mining}The methane sensor T is arranged on the return airway of the mining area where the coal face is located_{10 mining}；

b12. As a coal face methane sensor T_{1 mining}The monitoring value reaches the upper limit of the range of the sensor or rises to more than 10% within 20s, the duration is not less than 5min, and meanwhile, the time is not more than t_MiningWithin the time of (1), the methane sensor T of the return airway of the coal face_{2 mining}Rising to more than 5% within 20s of the monitoring value, and judging that coal and gas outburst occurs on the coal face when the duration is not less than 5 min;

b13. as a coal face methane sensor T_{1 mining}Broken while not more than t_MiningWithin the time of (1), the methane sensor T of the return airway of the coal face_{2 mining}Rising to more than 5% within 20s of the monitoring value, and judging that coal and gas outburst occurs on the coal face when the duration is not less than 5 min;

b14. as a coal face methane sensor T_{1 mining}The monitoring value reaches the upper limit of the range of the sensor or rises to more than 10 percent within 20s, and the duration is not less than5min while not more than t_MiningCoal face return airway methane sensor T within time_{2 mining}Breaking the line, and judging that coal and gas outburst occurs on the coal face;

b15. as a coal face methane sensor T_{1 mining}Methane sensor T for return airway of coal face_{2 mining}At not more than t_MiningAnd the line is broken in succession in the time of (1), and the wind speed sensor F of the return airway of the coal face_{1 mining}The monitoring value is increased by more than 30 percent or the methane sensor T of the return airway of the mining area where the coal face is positioned_{10 mining}If the monitoring value exceeds 1%, judging that coal and gas outburst occurs on the coal face;

b16. as a coal face methane sensor T_{1 mining}Methane sensor T for return airway of coal face_{2 mining}The monitoring values reach the upper limit of the range of the sensor, break the line or rise to more than 5 percent within 20s in succession, and the wind direction sensor F of the air inlet roadway of the coal face_{X mining}Methane sensor T for generating reverse or coal face air intake tunnel_{3 mining}And if the coal face exceeds 1%, judging that coal and gas outburst occurs on the coal face.

Alternatively to this, the first and second parts may,

t_mining＝L_Mining/(60v_Mining)；

Wherein t is_MiningMethane sensor T for wind flow from coal face_{1 mining}Methane sensor T flowing to coal face return airway_{2 mining}Time at the installation site in minutes;

L_miningFor coal face methane sensor T_{1 mining}Methane sensor T for return airway to coal face_{2 mining}Distance of installation site in meters;

v_miningFor coal face methane sensor T under normal production conditions_{1 mining}Methane sensor T for return airway of coal face_{2 mining}The unit of the wind speed of the roadway is meter per second.

Optionally, when the working face in step b is a tunneling working face, step b includes

b21. The methane sensor T with high and low concentration or full range is arranged on the driving face_{1 digging}At the heading faceThe methane sensor T with high and low concentration or full range is arranged in the air way_{2 dig}The methane sensor T is arranged at the air inlet air distribution port of the driving face_{3 digging}The wind speed sensor F is arranged on the return airway of the driving face_{1 digging}The wind direction sensor F is arranged at the air inlet air distributing port of the driving face_{X-shaped digging}The methane sensor T is arranged on the return airway of the mining area where the driving working face is positioned_{10 dug (Chinese character of 'dug')}；

b22. When the tunneling working face methane sensor T_{1 digging}The monitoring value reaches the upper limit of the range of the sensor or rises to more than 10% within 20s, the duration is not less than 5min, and meanwhile, the time is not more than t_{Digging machine}Within the time of (3), the working face air return roadway methane sensor T is tunneled_{2 dig}Rising to more than 5% within 20s of the monitoring value, and judging that coal and gas outburst occurs on the tunneling working face, wherein the duration time is not less than 5 min;

b23. when the tunneling working face methane sensor T_{1 digging}Broken while not more than t_{Digging machine}Within the time of (3), the working face air return roadway methane sensor T is tunneled_{2 dig}Rising to more than 5% within 20s of the monitoring value, and judging that coal and gas outburst occurs on the tunneling working face, wherein the duration time is not less than 5 min;

b24. when the tunneling working face methane sensor T_{1 digging}The monitoring value reaches the upper limit of the range of the sensor or rises to more than 10% within 20s, the duration is not less than 5min, and meanwhile, the time is not more than t_{Digging machine}Time-based methane sensor T for air return roadway of driving working face_{2 dig}Breaking the wire, and judging that coal and gas outburst occurs on the tunneling working face;

b25. when the tunneling working face methane sensor T_{1 digging}And methane sensor T of air return roadway of driving face_{2 dig}At not more than t_{Digging machine}And the wind speed sensor F is used for driving the return airway of the working face_{1 digging}The monitoring value is increased by more than 30 percent or the methane sensor T of the return airway of the mining area where the driving working face is positioned_{10 dug (Chinese character of 'dug')}If the monitoring value exceeds 1%, judging that coal and gas outburst occurs on the tunneling working face;

b26. when the tunneling working face methane sensor T_{1 digging}Methane sensor T for air return roadway of tunneling working face_{2 dig}Successive reaching of monitored valuesThe upper limit of the range of the sensor, broken line or the wind direction sensor F rises to more than 5 percent within 20s and enters the air inlet roadway of the driving working face_{X-shaped digging}Methane sensor T at air inlet of working face for reversing or tunneling_{3 digging}And if the coal and gas outburst occurs, judging that the coal and gas outburst occurs on the tunneling working face.

Alternatively to this, the first and second parts may,

t_{digging machine}＝L_{Digging machine}/(60v_{Digging machine})；

Wherein t is_{Digging machine}Methane sensor T for driving wind flow from driving face_{1 digging}Methane sensor T flowing to air return roadway of tunneling working face_{2 dig}Time at the installation site in minutes;

L_{digging machine}For driving face methane sensor T_{1 digging}Methane sensor T for air return roadway of driving face_{2 dig}Distance of installation site in meters;

v_{digging machine}For driving working face methane sensor T under normal production condition_{1 digging}And methane sensor T of air return roadway of driving face_{2 dig}The unit of the wind speed of the roadway is meter per second.

The invention has the beneficial effects that:

according to the coal and gas outburst catastrophe identification method for the coal mine excavation working face, on one hand, the method can be realized without adding any sensor underground, the identification of the coal and gas outburst catastrophe can be realized only by monitoring abnormal change characteristics of data by using the existing sensor underground of a coal mine, and the investment cost is low; on the other hand, the technical identification method has strong operability and reliable identification result, can timely judge the time and the place of coal and gas outburst catastrophe, effectively reduce the false alarm rate, facilitate time control and disaster reduction, avoid secondary disasters and reduce casualties and economic loss.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.

Drawings

For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic view of a coal face sensor installation of the present invention;

fig. 2 is a schematic view of the sensor installation of the heading face of the present invention.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.

Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; 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 an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.

Referring to fig. 1 to 2, firstly, in the implementation of the present invention, a methane sensor, an air speed sensor and an air direction sensor are installed at corresponding positions under a coal mine, and monitoring value abnormalities of the methane sensor, the air speed sensor and the air direction sensor of a mining and tunneling working face, an air intake roadway, an air return roadway and a mining area air return roadway are analyzed in real time.

In the specific embodiment 1, the method comprises the following steps of,

the coal face and the return airway sensor of the mining area are arranged as shown in figure 1, and specifically comprise the following steps:

firstly, a methane sensor T with high and low concentration or full range is arranged on a coal face_{1 mining}The position is that the distance between the return airway of the coal face and the coal face is less than or equal to 10 m;

secondly, a methane sensor T with high and low concentration or full range is arranged on a return airway of the coal face_{2 mining}The position is 10-15 m away from the mixed air flow position of the return airway of the coal face;

thirdly, installing a methane sensor T on the air intake tunnel of the coal face_{3 mining}The position is that the distance between the air inlet tunnel of the coal face and the coal face is less than or equal to 10 m;

fourthly, installing a wind speed sensor F on a return airway of the coal face_{1 mining}The position is 10-15 m away from the outer opening of the roadway of the return airway of the coal face;

installing wind direction sensor F in air intake tunnel of coal face_{X mining}(ii) a The position is that the distance between the air inlet tunnel of the coal face and the coal face is less than or equal to 10 m;

installing methane sensor T in return airway of coal face_{10 mining}And the position is the wind measuring station of the return airway of the mining area.

In the embodiment, the coal face is judged to have coal and gas outburst catastrophe when any one of the following conditions occurs:

(1) as a coal face methane sensor T_{1 mining}The monitoring value reaches the upper limit of the range of the sensor or rises to more than 10 percent within 20s, the duration is not less than 5min, and meanwhile, the time is measured when the time is up toNot more than t_MiningWithin the time of (1), the methane sensor T of the return airway of the coal face_{2 mining}The monitoring value rises to more than 5% within 20s, and the duration is not less than 5 min;

(2) as a coal face methane sensor T_{1 mining}Broken while not more than t_MiningWithin the time of (1), the methane sensor T of the return airway of the coal face_{2 mining}The monitoring value rises to more than 5% within 20s, and the duration is not less than 5 min;

(3) as a coal face methane sensor T_{1 mining}The monitoring value reaches the upper limit of the range of the sensor or rises to more than 10% within 20s, the duration is not less than 5min, and meanwhile, the time is not more than t_MiningCoal face return airway methane sensor T within time_{2 mining}Breaking the wire;

(4) as a coal face methane sensor T_{1 mining}Methane sensor T for return airway of coal face_{2 mining}At not more than t_MiningAnd the line is broken in succession in the time of (1), and the wind speed sensor F of the return airway of the coal face_{1 mining}The monitoring value is increased by more than 30 percent or the methane sensor T of the return airway of the mining area where the coal face is positioned_{10 mining}The monitoring value exceeds 1%;

(5) as a coal face methane sensor T_{1 mining}Methane sensor T for return airway of coal face_{2 mining}The monitoring values reach the upper limit of the range of the sensor, break the line or rise to more than 5 percent within 20s in succession, and the wind direction sensor F of the air inlet roadway of the coal face_{X mining}Methane sensor T for generating reverse or coal face air intake tunnel_{3 mining}More than 1%;

in the present embodiment, t_MiningBy the formula t_Mining＝L_Mining/(60v_Mining) And (4) calculating.

Wherein t is_MiningMethane sensor T for wind flow from coal face_{1 mining}Methane sensor T flowing to coal face return airway_{2 mining}Time at the installation site in minutes;

L_miningFor coal face methane sensor T_{1 mining}Methane sensor T for return airway to coal face_{2 mining}Distance of installation site in meters;

v_miningFor coal face methane sensor T under normal production conditions_{1 mining}Methane sensor T for return airway of coal face_{2 mining}The unit of the wind speed of the roadway is meter per second.

In the specific embodiment 2, the method comprises the following steps of,

the sensors of the heading face and the mining area air way in which the heading face is located are arranged as shown in figure 2, and specifically comprise the following components:

firstly, a methane sensor T with high and low concentration or full range is arranged on a driving face_{1 digging}The position is that the distance between the driving face and the head is less than or equal to 5 m;

secondly, a methane sensor T with high and low concentration or full range is arranged on the air return tunnel of the driving working face_{2 dig}The position is 10-15 m away from the mixed airflow position of an air return roadway of the excavation air inlet working face;

thirdly, a methane sensor T is arranged at the air inlet roadway air distribution port of the driving face_{3 mining}The position is 10-15 m away from the upper wind side of the air inlet and air distribution port of the driving face;

fourthly, installing a wind speed sensor F on the return airway of the driving face_{1 digging}The position is 10-15 m away from the mixed airflow position of an air return roadway of the excavation air inlet working face;

fifthly, a wind direction sensor F is arranged at the air inlet and air distribution port of the driving face_{X-shaped digging}The position is 10-15 m away from the upper wind side of the air inlet and air distribution port of the driving face;

installing methane sensor T in the return airway of the mining area where the driving face is_{10 dug (Chinese character of 'dug')}And the position is the wind measuring station of the return airway of the mining area.

In the embodiment, the coal and gas outburst of the heading face is judged when any one of the following conditions occurs:

(1) when the tunneling working face methane sensor T_{1 digging}The monitoring value reaches the upper limit of the range of the sensor or rises to more than 10% within 20s, the duration is not less than 5min, and meanwhile, the time is not more than t_{Digging machine}Within the time of (3), the working face air return roadway methane sensor T is tunneled_{2 dig}The monitoring value rises to more than 5% within 20s, and the duration is not less than 5 min;

(2) when the tunneling working face methane sensor T_{1 digging}The wire is broken, and at the same time,at not more than t_{Digging machine}Within the time of (3), the working face air return roadway methane sensor T is tunneled_{2 dig}The monitoring value rises to more than 5% within 20s, and the duration is not less than 5 min;

(3) when the tunneling working face methane sensor T_{1 digging}The monitoring value reaches the upper limit of the range of the sensor or rises to more than 10% within 20s, the duration is not less than 5min, and meanwhile, the time is not more than t_{Digging machine}Time-based methane sensor T for air return roadway of driving working face_{2 dig}Breaking the wire;

(4) when the tunneling working face methane sensor T_{1 digging}And methane sensor T of air return roadway of driving face_{2 dig}At not more than t_{Digging machine}And the wind speed sensor F is used for driving the return airway of the working face_{1 digging}The monitoring value is increased by more than 30 percent or the methane sensor T of the return airway of the mining area where the driving working face is positioned_{10 dug (Chinese character of 'dug')}The monitoring value exceeds 1%;

(5) when the tunneling working face methane sensor T_{1 digging}Methane sensor T for air return roadway of tunneling working face_{2 dig}The monitoring value reaches the upper limit of the range of the sensor, breaks the line or rises to more than 5 percent within 20s in succession, and the wind direction sensor F of the air inlet roadway of the driving face_{X-shaped digging}Methane sensor T at air inlet of working face for reversing or tunneling_{3 digging}Over 1%.

In the present embodiment, t_{Digging machine}By the formula t_{Digging machine}＝L_{Digging machine}/(60v_{Digging machine}) And (4) calculating.

Wherein t is_{Digging machine}Methane sensor T for driving wind flow from driving face_{1 digging}Methane sensor T flowing to air return roadway of tunneling working face_{2 dig}Time at the installation site in minutes;

L_{digging machine}For driving face methane sensor T_{1 digging}Methane sensor T for air return roadway of driving face_{2 dig}Distance of installation site in meters;

v_{digging machine}For driving working face methane sensor T under normal production condition_{1 digging}And methane sensor T of air return roadway of driving face_{2 dig}The unit of the wind speed of the roadway is meter per second.

According to the coal and gas outburst catastrophe identification method for the coal mine excavation working face, on one hand, the method can be realized without adding any sensor underground, the identification of the coal and gas outburst catastrophe can be realized only by monitoring abnormal change characteristics of data by using the existing sensor underground of a coal mine, and the investment cost is low; on the other hand, the technical identification method has strong operability and reliable identification result, can timely judge the time and the place of coal and gas outburst catastrophe, effectively reduce the false alarm rate, facilitate time control and disaster reduction, avoid secondary disasters and reduce casualties and economic loss.

Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.

Claims (4)

1. The disaster judgment and identification method for coal and gas outburst on the coal mining working face is characterized by comprising the following steps of: comprises that

a. Collecting gas concentration, wind speed and wind direction data of a mining working face and a return airway of a mining area where the mining working face is located through a methane sensor, a wind speed sensor and a wind direction sensor;

b. judging coal and gas outburst according to the abnormal change characteristics of the gas concentration, the wind speed and the wind direction data at different positions of the working surface;

when the working face in the step b is a coal face, the step b comprises

b11. High-low concentration or full-range methane sensor T arranged on coal face_{1 mining}The high-low concentration or full-range methane sensor T is arranged on the return airway of the coal face_{2 mining}The methane sensor T is arranged in the air intake tunnel of the coal face_{3 mining}The wind speed sensor F is arranged on the return airway of the coal face_{1 mining}The wind direction sensor F is arranged on the air intake tunnel of the coal face_{X mining}The methane sensor T is arranged on the return airway of the mining area where the coal face is located_{10 mining}；

b12. As a coal face methane sensor T_{1 mining}The monitoring value reaches the upper limit of the range of the sensor or rises to more than 10% within 20s, the duration is not less than 5min, and meanwhile, the time is not more than t_MiningWithin the time of (1), the methane sensor T of the return airway of the coal face_{2 mining}Rising to more than 5% within 20s of the monitoring value, and judging that coal and gas outburst occurs on the coal face when the duration is not less than 5 min;

b13. as a coal face methane sensor T_{1 mining}Broken while not more than t_MiningWithin the time of (1), the methane sensor T of the return airway of the coal face_{2 mining}Rising to more than 5% within 20s of the monitoring value, and judging that coal and gas outburst occurs on the coal face when the duration is not less than 5 min;

b14. as a coal face methane sensor T_{1 mining}The monitoring value reaches the upper limit of the range of the sensor or rises to more than 10% within 20s, the duration is not less than 5min, and meanwhile, the time is not more than t_MiningCoal face return airway methane sensor T within time_{2 mining}Breaking the line, and judging that coal and gas outburst occurs on the coal face;

b15. as a coal face methane sensor T_{1 mining}Methane sensor T for return airway of coal face_{2 mining}At not more than t_MiningAnd the line is broken in succession in the time of (1), and the wind speed sensor F of the return airway of the coal face_{1 mining}The monitoring value is increased by more than 30 percent or the methane sensor T of the return airway of the mining area where the coal face is positioned_{10 mining}If the monitoring value exceeds 1%, judging that coal and gas outburst occurs on the coal face;

b16. as a coal face methane sensor T_{1 mining}Methane sensor T for return airway of coal face_{2 mining}The monitoring values reach the upper limit of the range of the sensor, break the line or rise to more than 5 percent within 20s in succession, and the wind direction sensor F of the air inlet roadway of the coal face_{X mining}Methane sensor T for generating reverse or coal face air intake tunnel_{3 mining}And if the coal face exceeds 1%, judging that coal and gas outburst occurs on the coal face.

2. The coal and gas outburst catastrophe identification method for the coal mining working face of the coal mine according to claim 1, which is characterized in that:

t_mining＝L_Mining/(60v_Mining)；

Wherein t is_MiningMethane sensor T for wind flow from coal face_{1 mining}Methane sensor T flowing to coal face return airway_{2 mining}Time at the installation site in minutes;

L_miningFor coal face methane sensor T_{1 mining}Methane sensor T for return airway to coal face_{2 mining}Distance of installation site in meters;

v_miningFor coal face methane sensor T under normal production conditions_{1 mining}Methane sensor T for return airway of coal face_{2 mining}The unit of the wind speed of the roadway is meter per second.

3. The coal and gas outburst catastrophe identification method for the coal mining working face of the coal mine according to claim 1, which is characterized in that: when the working face in the step b is a tunneling working face, the step b comprises

b21. The methane sensor T with high and low concentration or full range is arranged on the driving face_{1 digging}The methane sensor T with high and low concentration or full range is arranged on the air return tunnel of the driving face_{2 dig}The methane sensor T is arranged at the air inlet air distribution port of the driving face_{3 digging}The wind speed sensor F is arranged on the return airway of the driving face_{1 digging}The wind direction sensor F is arranged at the air inlet air distributing port of the driving face_{X-shaped digging}The methane sensor T is arranged on the return airway of the mining area where the driving working face is positioned_{10 dug (Chinese character of 'dug')}；

b22. When the tunneling working face methane sensor T_{1 digging}The monitoring value reaches the upper limit of the range of the sensor or rises to more than 10% within 20s, the duration is not less than 5min, and meanwhile, the time is not more than t_{Digging machine}Within the time of (3), the working face air return roadway methane sensor T is tunneled_{2 dig}Rising to more than 5% within 20s of the monitoring value, and judging that coal and gas outburst occurs on the tunneling working face, wherein the duration time is not less than 5 min;

b23. when the tunneling working face methane sensor T_{1 digging}Wire breakAt the same time, at not more than t_{Digging machine}Within the time of (3), the working face air return roadway methane sensor T is tunneled_{2 dig}Rising to more than 5% within 20s of the monitoring value, and judging that coal and gas outburst occurs on the tunneling working face, wherein the duration time is not less than 5 min;

b24. when the tunneling working face methane sensor T_{1 digging}The monitoring value reaches the upper limit of the range of the sensor or rises to more than 10% within 20s, the duration is not less than 5min, and meanwhile, the time is not more than t_{Digging machine}Time-based methane sensor T for air return roadway of driving working face_{2 dig}Breaking the wire, and judging that coal and gas outburst occurs on the tunneling working face;

b25. when the tunneling working face methane sensor T_{1 digging}And methane sensor T of air return roadway of driving face_{2 dig}At not more than t_{Digging machine}And the wind speed sensor F is used for driving the return airway of the working face_{1 digging}The monitoring value is increased by more than 30 percent or the methane sensor T of the return airway of the mining area where the driving working face is positioned_{10 dug (Chinese character of 'dug')}If the monitoring value exceeds 1%, judging that coal and gas outburst occurs on the tunneling working face;

b26. when the tunneling working face methane sensor T_{1 digging}Methane sensor T for air return roadway of tunneling working face_{2 dig}The monitoring value reaches the upper limit of the range of the sensor, breaks the line or rises to more than 5 percent within 20s in succession, and the wind direction sensor F of the air inlet roadway of the driving face_{X-shaped digging}Methane sensor T at air inlet of working face for reversing or tunneling_{3 digging}And if the coal and gas outburst occurs, judging that the coal and gas outburst occurs on the tunneling working face.

4. The coal and gas outburst catastrophe identification method for the coal mining working face of the coal mine according to claim 3, which is characterized in that:

t_{digging machine}＝L_{Digging machine}/(60v_{Digging machine})；

Wherein t is_{Digging machine}Methane sensor T for driving wind flow from driving face_{1 digging}Methane sensor T flowing to air return roadway of tunneling working face_{2 dig}Time at the installation site in minutes;

L_{digging machine}For driving face methane sensor T_{1 digging}To the driving faceAir tunnel methane sensor T_{2 dig}Distance of installation site in meters;

v_{digging machine}For driving working face methane sensor T under normal production condition_{1 digging}And methane sensor T of air return roadway of driving face_{2 dig}The unit of the wind speed of the roadway is meter per second.

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