Gas early warning method and system based on relative gas emission

Abstract

The application discloses a gas early warning method and system based on relative gas emission quantity, and the method comprises the following steps: obtaining the wind speed data, the cross-sectional area and the air volume data of the working face roadway; obtaining the gas air exhaust quantity according to the methane concentration data and in combination with the air volume data, and obtaining the absolute gas emission quantity in combination with the total gas extraction quantity; obtaining the relative gas emission quantity of the working face in combination with the daily gas production data of the working face; obtaining the emission average of the relative gas emission quantity according to the relative gas emission quantity and in combination with the historical data of the relative gas emission quantity, taking the emission average of the previous day as the early warning value of the relative gas emission quantity of the current day, and updating every day; setting a traceback rule, when the early warning value of the relative gas emission quantity and the trend early warning line of the relative gas emission quantity do not meet the traceback rule to early warning, the early warning reason is traced back. Through the method, the early warning capability of the coal mining working face during the mining can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mine gas monitoring, and in particular to a gas early warning method and system based on relative gas emission volume. Background Art

[0002] Gas emission refers to the amount of gas emitted from coal and rock during mine construction and production. The total gas emission for the entire mine is called the mine gas emission rate, while the gas emission rate for a wing, mining area, or working face is called the wing, mining area, or working face gas emission rate. The magnitude of a mine's gas emission is typically expressed using two parameters: the absolute gas emission rate and the relative gas emission rate.

[0003] Gas emission is a key parameter that reflects the presence of gas in coal seams. This means that gas concentration alone cannot fully represent the gas presence in coal seams. The dilution of gas emission by the supplied air volume must be considered to determine and understand the absolute gas emission rate. Gas is present in large quantities in coal seams. To understand gas release in conjunction with coal production, the per-ton parameter must be divided. The average gas emission per ton of coal mined is called the relative gas emission rate. Gas is the primary hazard in coal mining, and gas emission is a comprehensive parameter that reflects a mine's gas situation. Gas emission varies from mine to mine depending on its geological structure, and this parameter can be used to understand and even determine a mine's characteristics.

[0004] Currently, most of the safety monitoring systems used in coal mines only set alarm points for the upper and lower limits of methane sensors. When calculating the amount of gas outflow, the method used is manual calculation, and there is no early warning function.

[0005] In the prior art, the invention patent with publication number CN103104292A is a method for quickly identifying outburst accidents and predicting the scale of gas outbursts in the early stages of an outburst. Seven sensors are set up underground, and the data detected by each gas sensor is transmitted to the early warning server in real time through the monitoring data communication substation. The early warning server analyzes the detected data to determine whether an outburst has occurred. When it is determined that an outburst has occurred, the gas outburst volume, outburst duration, and gas backflow range of this outburst are predicted based on the data monitored by the second and fourth gas sensors, and the diffusion range of this outburst is determined based on the data of the fifth, sixth, and seventh gas sensors. The prior art is an early warning based on gas concentration. The gas concentration cannot comprehensively reflect the gas situation in the mine, and the effect of the early warning is limited. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide an effective gas early warning.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0008] A gas early warning method based on relative gas emission volume comprises the following steps:

[0009] S100, collects on-site wind speed and obtains wind speed data;

[0010] S200, obtaining the cross-sectional area of ​​the working face tunnel at the location of the wind speed collection point;

[0011] S300, collecting point air volume data of the working face roadway, and combining the cross-sectional area and the wind speed data to obtain the air volume data of the working face roadway;

[0012] S400, obtaining the gas discharge volume released in the wind in the working face tunnel based on the methane concentration data and the air volume data;

[0013] S500, combining the gas air discharge volume with the total amount of gas extracted from the working face to obtain an absolute gas emission volume; and combining the daily gas production data of the working face to obtain a relative gas emission volume of the working face;

[0014] S600: Based on the daily relative gas emission volume of the working face and in combination with historical data on the relative gas emission volume, an average relative gas emission volume is obtained. The average emission volume of the previous day is used as the relative gas emission volume warning value for the current day, and the relative gas emission volume warning value is updated daily.

[0015] S700 connects the daily relative gas emission warning values ​​to form a trend warning line for the relative gas emission, providing early warning of the gas extraction situation at the working face.

[0016] S800, set a tracing rule. When the relative gas emission warning value and the trend warning line of the relative gas emission do not comply with the tracing rule to issue a warning, the cause of the warning is traced in combination with the gas air discharge volume, the total gas extraction volume and the methane concentration data.

[0017] Advantages: This system uses a large amount of real-time data to obtain real-time data on air volume, gas air displacement, and total gas extraction. This data is then combined with daily gas production data to determine the relative gas emission rate. The average relative gas emission rate is used as a trend warning line for the relative gas emission rate. This average relative gas emission rate is updated daily and, combined with data on gas air displacement, total gas extraction, and methane concentration, provides early warnings for mine production to adjust recovery speed or increase extraction efforts.

[0018] In one embodiment of the present invention, in step S500, the total gas emission of the mine can also be obtained; the total gas emission of the mine is obtained by the following steps: the total gas emission of the mine is obtained based on the air volume data and methane concentration data of each working face roadway in the mine and the total gas extraction amount of all the working face roadways; wherein the total gas emission of the mine is obtained by the following formula:

[0019]

[0020] Where Q z It is expressed as the total gas emission of the mine, V is the wind speed data, C is the wind speed correction coefficient, S is the cross-sectional area of ​​the working face tunnel, T is the methane concentration data, Q cz It represents the total amount of gas extracted from all working face tunnels; i = 1, 2, 3....n, where n represents the number of working face tunnels.

[0021] In one embodiment of the present invention, the air volume data is obtained by the following formula:

[0022] Q=V*C*S

[0023] In the formula, Q represents the air volume data, V represents the wind speed data, C represents the wind speed correction coefficient, and S represents the cross-sectional area of ​​the working face tunnel;

[0024] The wind speed correction coefficient is obtained by the following formula:

[0025] C=Q s / V*S;

[0026] Where Q s Expressed as point air volume data of the working face tunnel.

[0027] In one embodiment of the present invention, the gas air discharge rate released in the wind in the working face tunnel is obtained by the following formula:

[0028] Q p =Q*T;

[0029] Where Q p It is expressed as gas air discharge capacity, and T is expressed as methane concentration data.

[0030] In one embodiment of the present invention, the absolute gas outflow rate is obtained by the following formula:

[0031] Q j =Q p +Q c ;

[0032] Where Q j Expressed as absolute gas emission, Q cExpressed as the total amount of gas extraction;

[0033] The relative gas emission rate of the working face is obtained by the following formula:

[0034] Q g =Q j / A;

[0035] Where Q g It is expressed as the relative gas outburst volume, and A is expressed as the daily gas production data of the working face.

[0036] In one embodiment of the present invention, in step S800, failure to comply with the traceability rules to issue an early warning includes the following situations: the daily relative gas outflow volume of the working face is not within the range of ±20% of the outflow mean; when the relative gas outflow volume continues to be lower than the relative gas outflow volume early warning value and the trend warning line of the relative gas outflow volume shows a downward trend.

[0037] In one embodiment of the present invention, in step S800, tracing the cause of the warning includes: obtaining the air volume ratio of the gas wind discharge volume based on the gas wind discharge volume and the total gas extraction volume; connecting the daily air volume ratio values ​​as the air volume ratio trend line, and judging whether the methane concentration data changes synchronously with the change of the air volume ratio trend line; if it is judged that the methane concentration data conforms to the changing trend of the air volume ratio, then obtaining the extraction method ratio for the various extraction methods of the working face, and obtaining the extraction relationship and extraction capacity of the extraction method through the extraction method ratio to find out the cause of the warning.

[0038] The present invention also provides a gas early warning system based on relative gas emission volume, comprising:

[0039] Wind speed module, used to collect on-site wind speed and obtain wind speed data;

[0040] The cross-sectional area module is used to obtain the cross-sectional area of ​​the working face tunnel at the location of the wind speed collection point;

[0041] An air volume module is used to collect point air volume data of the working face roadway, and obtain the air volume data of the working face roadway by combining the cross-sectional area and the wind speed data;

[0042] A gas air displacement module is used to obtain the gas air displacement released in the wind in the working face tunnel according to the methane concentration data and the air volume data;

[0043] The relative gas emission module is used to obtain the absolute gas emission volume by combining the gas air discharge volume with the total gas extraction volume of the working face; and to obtain the relative gas emission volume of the working face by combining the daily gas production data of the working face;

[0044] A first early warning module is configured to obtain the daily relative gas emission rate of the working end face through the relative gas emission rate, and obtain an average relative gas emission rate based on historical data of the relative gas emission rate, and use the average emission rate of the previous day as the relative gas emission rate early warning value of the current day, and update the relative gas emission rate early warning value every day;

[0045] The second early warning module is used to connect the daily relative gas emission warning values ​​as a trend warning line for the relative gas emission to provide early warning of the gas mining situation at the working face;

[0046] The tracing module is used to set tracing rules. When the relative gas emission warning value and the trend warning line of the relative gas emission do not meet the tracing rules for warning, the warning cause is traced in combination with the gas air discharge volume, the total gas extraction volume and the methane concentration data.

[0047] In one embodiment of the present invention, in the air volume module, the air volume data is obtained by the following formula:

[0048] Q=V*C*S

[0049] In the formula, Q represents the air volume data, V represents the wind speed data, C represents the wind speed correction coefficient, and S represents the cross-sectional area of ​​the working face tunnel;

[0050] The wind speed correction coefficient is obtained by the following formula:

[0051] C=Q s / V*S;

[0052] Where Q s Expressed as point air volume data of working face roadway;

[0053] In the gas wind displacement module, the gas wind displacement released in the wind in the working face tunnel is obtained by the following formula:

[0054] Q p =Q*T;

[0055] Where Q p It is expressed as gas air discharge capacity, and T is expressed as methane concentration data.

[0056] In one embodiment of the present invention, in the relative gas outflow rate module, the absolute gas outflow rate is obtained by the following formula:

[0057] Q j =Q p +Q c ;

[0058] Where Q j Expressed as absolute gas emission, Qc Expressed as the total amount of gas extraction;

[0059] The relative gas emission rate of the working face is obtained by the following formula:

[0060] Q g =Q j / A;

[0061] Where Q g It is expressed as the relative gas outburst volume, and A is expressed as the daily gas production data of the working face.

[0062] Compared with existing technologies, this invention offers the following advantages: By providing early warnings of relative gas emission rates, potential deficiencies in coal face gas control capabilities can be promptly identified, enabling proactive measures to ensure safe and reliable gas control at the coal face. This also eliminates the previous need for manual calculations of relative gas emission rates. This provides a new platform for real-time monitoring of gas conditions at each coal face, improving early warning capabilities during mining operations.

[0063] In the past, manual calculations were required to calculate the relative gas emission volume of a coal mining face. The established relative gas emission calculation model can automatically calculate the daily relative gas emission volume. By comparing it with the trend warning line for the relative gas emission volume, the relationship between extraction volume and production can be clearly seen, saving a lot of manpower and material resources. When the relative gas emission volume is continuously lower than the trend warning line for the relative gas emission volume, consideration should be given to whether the gas in the coal seam of the working face is hidden in the remaining coal seams to be mined, and whether it is necessary to adjust production or increase extraction efforts to increase gas emission per ton of coal, ensure mining safety, and prevent gas outburst accidents. Through calculation models for gas air displacement, air volume ratio, and extraction method ratio, the size and changes of the extraction capacity of the working face can be clearly and quickly seen, facilitating quick judgments and improving gas outburst prevention and early warning capabilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1 The figure is a flow chart of a gas early warning method based on relative gas outflow volume according to an embodiment of the present invention.

[0065] Figure 2 This is a diagram showing the effect of a gas early warning based on relative gas outflow volume in an embodiment of the present invention.

[0066] Figure 3 This is a diagram showing the effect of the extraction method ratio in an embodiment of the present invention.

[0067] Figure 4 This is a diagram showing the effect of relative gas emission warning according to an embodiment of the present invention.

[0068] Figure 5The figure is a block diagram of a gas early warning system based on relative gas outflow volume according to an embodiment of the present invention. DETAILED DESCRIPTION

[0069] To facilitate those skilled in the art to understand the technical solution of the present invention, the technical solution of the present invention is further described with reference to the accompanying drawings.

[0070] The terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0071] See also Figure 1 As shown, the present invention provides a gas early warning method based on relative gas outflow amount, comprising the following steps:

[0072] S100: Collect on-site wind speed and obtain wind speed data.

[0073] Among them, the wind speed is collected by a wind speed sensor.

[0074] S200: Obtain the cross-sectional area of ​​the working face tunnel at the location of the wind speed collection point.

[0075] The cross-sectional area of ​​the working face tunnel is obtained from the basic information database. Since the mining distance of the working face is long, the real-time wind speed data collected is only the wind speed at the point where the wind speed sensor is located, which cannot fully reflect the wind speed of the entire tunnel. Therefore, a wind speed correction coefficient is introduced to balance the overall wind speed of the tunnel. The wind speed correction coefficient is obtained by the following formula:

[0076] C=Q s / V*S;

[0077] Where C is the wind speed correction coefficient, Q s It represents the point air volume data of the working face tunnel, V represents the wind speed data, and S represents the cross-sectional area of ​​the working face tunnel.

[0078] S300 , collecting point air volume data of the working face tunnel, and obtaining the air volume data of the working face tunnel by combining the cross-sectional area and the wind speed data.

[0079] The air volume data is obtained by the following formula:

[0080] Q=V*C*S

[0081] In the formula, Q represents the air volume data, V represents the wind speed data, C represents the wind speed correction coefficient, and S represents the cross-sectional area of ​​the working face tunnel.

[0082] S400, based on the methane concentration data and in combination with the air volume data, obtain the gas air discharge volume released in the wind in the working face tunnel.

[0083] Among them, methane concentration data is collected through a methane sensor, and the working face tunnel where the methane sensor is located and the collection point of the wind speed sensor are in the same working face tunnel.

[0084] Specifically, the gas discharge rate released in the wind in the working face tunnel is obtained by the following formula:

[0085] Q p =Q*T;

[0086] Where Q p It is expressed as gas air discharge capacity, and T is expressed as methane concentration data.

[0087] S500, the gas air discharge volume is combined with the total amount of gas extracted from the working face to obtain the absolute gas emission volume; and combined with the daily gas production data of the working face to obtain the relative gas emission volume of the working face.

[0088] The absolute gas emission rate is obtained by the following formula:

[0089] Q j =Q p +Q c ;

[0090] Where Q j Expressed as absolute gas emission, Q c Expressed as the total amount of gas extracted.

[0091] The relative gas emission rate of the working face is obtained by the following formula:

[0092] Q g =Q j / A;

[0093] Where Q g It is expressed as the relative gas outburst volume, and A is expressed as the daily gas production data of the working face.

[0094] In step S500, the total gas emission of the mine can also be obtained; the total gas emission of the mine is obtained by the following steps: the total gas emission of the mine is obtained based on the air volume data, methane concentration data of each working face roadway in the mine, and the total gas extraction amount of all the working face roadways; wherein the total gas emission of the mine is obtained by the following formula:

[0095]

[0096] Where Qz It is expressed as the total gas emission of the mine, V is the wind speed data, C is the wind speed correction coefficient, S is the cross-sectional area of ​​the working face tunnel, T is the methane concentration data, Q cz Represents the total gas extraction volume from all working face tunnels; i = 1, 2, 3, ...n, where n represents the number of working face tunnels. Obtaining the total gas emission volume from the mine prepares for the next step of calculating the total gas emission volume of the coal mine.

[0097] S600, based on the daily relative gas emission volume of the working face and combined with the historical data of relative gas emission volume, obtain the average emission volume of the relative gas emission volume, and use the average emission volume of the previous day as the relative gas emission volume warning value of the day, and update the relative gas emission volume warning value every day.

[0098] Among them, when the daily relative gas outburst volume of the working face is not within the range of ±20% of the outburst mean, it is necessary to trace the cause of the warning.

[0099] S700 connects the daily relative gas emission warning values ​​as the trend warning line of the relative gas emission to provide early warning of the gas mining situation at the working face.

[0100] See also Figures 1 to 3 As shown, when the relative gas emission volume is continuously lower than the relative gas emission volume warning value and the trend warning line of the relative gas emission volume shows a downward trend, it may be caused by insufficient gas extraction from the protected layer. There may be hidden dangers, and early warning analysis is needed to find the cause. If the relative gas emission volume is continuously higher than the relative gas emission volume warning value and the trend warning line of the relative gas emission volume shows an upward trend, there are two situations. The first situation is that the output of this working face may be low. The second situation is that the area of ​​the coal seam that has been mined in this working face has a high gas content per ton of coal. Whether it is necessary to continue to maintain the extraction intensity or the mining speed in the next step of mining, a comprehensive judgment of multiple data can fully reflect the gas control situation of this working face and provide reference suggestions for mine management and technical personnel to take gas control measures on the working face.

[0101] S800, set a tracing rule. When the relative gas emission warning value and the trend warning line of the relative gas emission do not comply with the tracing rule to issue a warning, the cause of the warning is traced in combination with the gas air discharge volume, the total gas extraction volume and the methane concentration data.

[0102] See also Figures 1 to 4As shown, in step S800, the following situations occur when the tracing rules are not met for issuing an early warning: 1) The daily relative gas emission volume of the working face is not within the range of ±20% of the emission mean. 2) When the relative gas emission volume is continuously lower than the relative gas emission volume early warning value and the trend warning line of the relative gas emission volume shows a downward trend. When either of the above two situations occurs, the cause of the early warning must be traced. Tracing the cause of the early warning includes: obtaining the air volume ratio of the gas air emission volume based on the gas wind emission volume and the total gas extraction volume. Connecting the daily air volume ratio values ​​as the air volume ratio trend line, determine whether the methane concentration data changes synchronously with the change of the air volume ratio trend line. If it is determined that the methane concentration data meets the change trend of the air volume ratio, the extraction method ratio of the various extraction methods of the working face is obtained. Through the extraction method ratio, the extraction relationship and extraction capacity of the extraction method are obtained to find the cause of the early warning.

[0103] Specifically, the air volume ratio is obtained by the following formula:

[0104] B=Q p / Q p +Q c ;

[0105] Where B represents the air volume ratio.

[0106] Because gas is free in the coal seam, the gas that appears during the mining process of our working face may not be from this coal seam. At this time, we need to extract the gas from other layers to ensure the safety of mining and avoid the coal mining working face. In order to prevent gas over-limit accidents during the mining process, a variety of extraction methods are often used to extract gas in advance, generally including old pond buried pipes, roof hole extraction, and layer hole extraction. By obtaining the extraction method ratio, we can have a more intuitive understanding of the extraction method of the entire working face, and can easily see the trend of changes in various extraction methods. In the past, coal mine engineering and technical personnel used manual calculations for analysis. Through the extraction method ratio, real-time calculations can be performed to quickly view changes in various extraction methods. Specifically, the extraction method ratio is obtained through the following formula:

[0107]

[0108] Where D represents the proportion of extraction methods, C j It represents the j-th sampling method, j=1, 2, 3...N.

[0109] The extraction method ratio can reveal various extraction relationships and extraction capacity. Specifically, if methane concentration data is found to be abnormal with the air volume ratio, the extraction method ratio is used to obtain the extraction method ratio value, further analyzing which extraction method has the abnormal extraction intensity and tracing the cause of the abnormality. If the methane concentration data is determined to be inconsistent with the changing trend of the air volume ratio, the changes in gas wind displacement are analyzed. If the changes in gas wind displacement are unclear, the extraction method ratio and the specific extraction method are analyzed.

[0110] See also Figure 5 As shown, the present invention also provides a gas early warning system based on relative gas outflow volume, comprising: a wind speed module 100, a cross-sectional area module 200, an air volume module 300, a gas air displacement module 400, a relative gas outflow volume module 500, a first early warning module 600, a second early warning module 700, and a tracing module 800. The wind speed module 100 is used to collect on-site wind speed and obtain wind speed data; the cross-sectional area module 200 is used to obtain the cross-sectional area of ​​the working face tunnel at the wind speed collection point; and the air volume module 300 is used to collect point air volume data of the working face tunnel and, combining the cross-sectional area and wind speed data, obtain air volume data for the working face tunnel. The gas wind displacement module 400 is used to obtain the gas wind displacement released in the wind in the working face tunnel based on the methane concentration data in combination with the wind volume data. The relative gas outflow module 500 is used to obtain the absolute gas outflow volume by combining the gas wind displacement with the total amount of gas extracted from the working face; and to obtain the relative gas outflow volume of the working face in combination with the daily gas production data of the working face. The first early warning module 600 is used to obtain the average relative gas emission volume based on the daily relative gas emission volume of the working face and in combination with the historical data of the relative gas emission volume, and use the average emission volume of the previous day as the relative gas emission volume early warning value of the day, and update the relative gas emission volume early warning value every day. The second early warning module 700 is used to connect the daily relative gas emission volume early warning values ​​as the trend early warning line of the relative gas emission volume to issue an early warning on the gas mining situation of the working face. The tracing module 800 is used to set tracing rules. When the relative gas emission volume early warning value and the trend early warning line of the relative gas emission volume do not comply with the tracing rules to issue an early warning, the cause of the early warning is traced in combination with the gas wind discharge volume, the total amount of gas extraction and the methane concentration data.

[0111] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description. It is intended that all variations within the meaning and range of equivalents of the claims be embraced herein, and any reference signs in the claims should not be construed as limiting the claims to which they relate.

[0112] The above-mentioned embodiments merely represent the implementation methods of the invention. The protection scope of the present invention is not limited to the above-mentioned embodiments. For those skilled in the art, several variations and improvements can be made without departing from the concept of the present invention, which all fall within the protection scope of the present invention.

Claims

1. A gas early warning method based on relative gas emission volume, characterized in that: The following steps are involved: S100, collects on-site wind speed and obtains wind speed data; S200, obtaining the cross-sectional area of ​​the working face tunnel at the location of the wind speed collection point; S300, collecting point air volume data of the working face roadway, and combining the cross-sectional area and the wind speed data to obtain the air volume data of the working face roadway; S400, obtaining the gas discharge volume released in the wind in the working face tunnel based on the methane concentration data and the air volume data; S500, combining the gas air discharge volume with the total amount of gas extracted from the working face to obtain an absolute gas emission volume; and combining the daily gas production data of the working face to obtain a relative gas emission volume of the working face; S600: Based on the daily relative gas emission volume of the working face and in combination with historical data on the relative gas emission volume, an average relative gas emission volume is obtained. The average emission volume of the previous day is used as the relative gas emission volume warning value for the current day, and the relative gas emission volume warning value is updated daily. S700 connects the daily relative gas emission warning values ​​to form a trend warning line for the relative gas emission, providing early warning of the gas extraction situation at the working face. S800: Setting a tracing rule. When the relative gas emission warning value and the trend warning line of the relative gas emission do not meet the tracing rule and issue a warning, tracing the cause of the warning by combining the gas air discharge volume, the total gas extraction volume, and the methane concentration data. In step S500, the total gas emission of the mine can also be obtained; the total gas emission of the mine is obtained by the following steps: the total gas emission of the mine is obtained based on the air volume data, methane concentration data of each working face roadway in the mine, and the total gas extraction amount of all the working face roadways; wherein the total gas emission of the mine is obtained by the following formula: Where Q z It is expressed as the total gas emission of the mine, V is the wind speed data, C is the wind speed correction coefficient, S is the cross-sectional area of ​​the working face tunnel, T is the methane concentration data, Q cz It represents the total amount of gas extracted from all working face tunnels; i = 1, 2, 3....n, where n represents the number of working face tunnels.

2. The gas early warning method based on relative gas emission volume according to claim 1, characterized in that: The air volume data is obtained by the following formula: Q=V*C*S In the formula, Q represents the air volume data, V represents the wind speed data, C represents the wind speed correction coefficient, and S represents the cross-sectional area of ​​the working face tunnel; The wind speed correction coefficient is obtained by the following formula: C=Q s / V*S; Where Q s Expressed as point air volume data of the working face tunnel.

3. The gas early warning method based on relative gas emission volume according to claim 2, characterized in that: The gas discharge rate released in the wind in the working face tunnel is obtained by the following formula: Q p =Q*T; Where Q p It is expressed as gas air discharge capacity, and T is expressed as methane concentration data.

4. The gas early warning method based on relative gas emission volume according to claim 3, characterized in that: The absolute gas emission rate is obtained by the following formula: Q j =Q p +Q c ; Where Q j Expressed as absolute gas emission, Q c Expressed as the total amount of gas extraction; The relative gas emission rate of the working face is obtained by the following formula: Q g =Q j / A; Where Q g It is expressed as the relative gas outburst volume, and A is expressed as the daily gas production data of the working face.

5. The gas early warning method based on relative gas emission volume according to claim 4, characterized in that: In step S800, the failure to comply with the traceability rules to issue an early warning includes the following situations: the daily relative gas outflow of the working face is not within the range of ±20% of the outflow mean; when the relative gas outflow continues to be lower than the relative gas outflow warning value and the trend warning line of the relative gas outflow shows a downward trend.

6. The gas early warning method based on relative gas emission volume according to claim 5, characterized in that: In step S800, tracing the cause of the warning includes: obtaining the air volume ratio of the gas wind discharge according to the gas wind discharge volume and the total gas extraction volume; connecting the daily air volume ratio values ​​as the air volume ratio trend line, and judging whether the methane concentration data changes synchronously with the change of the air volume ratio trend line; if it is judged that the methane concentration data conforms to the changing trend of the air volume ratio, then obtaining the extraction method ratio for the various extraction methods of the working face, and obtaining the extraction relationship and extraction capacity of the extraction method through the extraction method ratio to find out the cause of the warning.

7. A system based on the gas early warning method based on relative gas emission volume according to any one of claims 1 to 6, characterized in that: include: Wind speed module, used to collect on-site wind speed and obtain wind speed data; The cross-sectional area module is used to obtain the cross-sectional area of ​​the working face tunnel at the location of the wind speed collection point; An air volume module is used to collect point air volume data of the working face roadway, and obtain the air volume data of the working face roadway by combining the cross-sectional area and the wind speed data; A gas air displacement module is used to obtain the gas air displacement released in the wind in the working face tunnel according to the methane concentration data and the air volume data; The relative gas emission module is used to obtain the absolute gas emission volume by combining the gas air discharge volume with the total gas extraction volume of the working face; and to obtain the relative gas emission volume of the working face by combining the daily gas production data of the working face; A first early warning module is configured to obtain the daily relative gas emission volume of the working face through the relative gas emission volume, and obtain an average relative gas emission volume in combination with historical data of the relative gas emission volume, and use the average emission volume of the previous day as the relative gas emission volume early warning value of the current day, and update the relative gas emission volume early warning value every day; The second early warning module is used to connect the daily relative gas emission warning values ​​as a trend warning line for the relative gas emission to provide early warning of the gas mining situation at the working face; The tracing module is used to set tracing rules. When the relative gas emission warning value and the trend warning line of the relative gas emission do not meet the tracing rules for warning, the warning cause is traced in combination with the gas air discharge volume, the total gas extraction volume and the methane concentration data.

8. The system according to claim 7, characterized in that In the air volume module, the air volume data is obtained by the following formula: Q=V*C*S In the formula, Q represents the air volume data, V represents the wind speed data, C represents the wind speed correction coefficient, and S represents the cross-sectional area of ​​the working face tunnel; The wind speed correction coefficient is obtained by the following formula: C=Q s / V*S; Where Q s Expressed as point air volume data of working face roadway; In the gas wind displacement module, the gas wind displacement released in the wind in the working face tunnel is obtained by the following formula: Q p =Q*T; Where Q p It is expressed as gas air discharge capacity, and T is expressed as methane concentration data.

9. The system according to claim 8, characterized in that In the relative gas emission module, the absolute gas emission is obtained by the following formula: Q j =Q p +Q c ; Where Q j Expressed as absolute gas emission, Q c Expressed as the total amount of gas extraction; The relative gas emission rate of the working face is obtained by the following formula: Q g =Q j / A; Where Q g It is expressed as the relative gas outburst volume, and A is expressed as the daily gas production data of the working face.

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