Mine gas emission quantity measuring and calculating method and system based on ultrasonic wind speed sensor

Abstract

The invention provides a mine gas emission amount measuring and calculating method and system based on an ultrasonic wind speed sensor, and belongs to the field of coal mine gas monitoring. The transmitting end and the receiving end of the ultrasonic wind speed sensor are fixed to roadway sides on the two sides of a roadway respectively, and ultrasonic echo signals in the downstream direction and ultrasonic echo signals in the countercurrent direction are collected; determining ultrasonic downwind time and ultrasonic headwind time according to the ultrasonic echo signal in the downstream direction and the ultrasonic echo signal in the countercurrent direction, calculating wind speed based on an ultrasonic time difference method speed measurement principle, and transmitting the wind speed to a cloud server; introducing a wind speed correction coefficient, and calculating the air volume of each total return airway based on the wind speed, the roadway section area and the wind speed correction coefficient; the air outlet gas discharge amount is calculated based on the air volume of each total air return way and the gas amount of the corresponding total air return way, and the total gas emission amount of the mine is calculated and displayed in combination with the total gas extraction amount; the monitoring mode that a traditional wind speed sensor replaces a plane with a point is changed, and the accurate total gas emission amount is calculated.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mine gas monitoring, and in particular to a method and system for calculating the amount of coal mine gas emission based on an ultrasonic wind speed sensor. Background Art

[0002] Mine gas refers to the gas released from coal seams, the main component of which is methane. Mine gas outburst refers to the amount of gas that flows from coal seams and goafs into the coal mine space during mining. Therefore, it is particularly important to accurately assess the amount of mine gas outburst and adopt appropriate response strategies. Methane control targets and policy measures may have an important impact on coal production and supply and industry development.

[0003] At present, due to technical and management reasons, an effective monitoring and statistical system for methane emissions in coal mining has not yet been established. Relevant departments and research institutions mainly refer to the methodology provided by the United Nations Climate Change Panel, and comprehensively consider factors such as coal production, development methods, and gas content to indirectly estimate methane emissions from coal mining. This method is a manual calculation method and cannot calculate the gas outflow volume of the mine in real time. It can only calculate the gas exhaust volume and gas extraction volume at that time. Each return air shaft and total return air tunnel in the mine must be manually calculated. The manual calculation workload is huge and not timely. In response to this problem, the Chinese invention patent application with publication number CN116557073A, "A Gas Early Warning Method and System Based on Relative Gas Emission Volume", discloses a gas early warning method based on relative gas emission volume, including the following steps: collecting on-site wind speed to obtain wind speed data; obtaining the cross-sectional area of ​​the working face tunnel at the location of the wind speed collection point; collecting point air volume data of the working face tunnel, and combining the cross-sectional area and wind speed data to obtain the air volume data of the working face tunnel; obtaining the gas wind displacement released in the wind in the working face tunnel based on the methane concentration data and the air volume data; combining the gas wind displacement with the total amount of gas extracted from the working face to obtain the absolute gas emission volume, and combining with the daily gas production data of the working face to obtain the relative gas emission volume of the working face. This patent application calculates the gas wind displacement based on wind speed data. The wind speed data is obtained by arranging point wind speed sensors in the tunnel. The wind speed value monitored by the sensor depends on the hanging position. If the tunnel cross-section becomes smaller due to factors such as accumulation, bottom drum, and roof pressure, the wind speed will be affected, resulting in unstable wind speed data monitored by the point wind speed sensor, which cannot accurately reflect the wind speed of the entire tunnel, and thus cannot obtain accurate gas wind displacement, affecting the accuracy of the calculation of the total gas outburst data of the mine. Summary of the invention

[0004] The technical problem to be solved by the present invention is how to obtain accurate tunnel wind speed data to ensure the accuracy of the calculation of the total gas emission data of the mine.

[0005] The present invention solves the above technical problems through the following technical solutions: a method for measuring the amount of gas emission in a mine based on an ultrasonic wind speed sensor, the method comprising:

[0006] Step 1, fix the transmitting end and the receiving end of the ultrasonic wind speed sensor on the sides of the laneway respectively, and collect ultrasonic echo signals in the downstream direction and the upstream direction;

[0007] Step 2: Determine the ultrasonic downwind time and the ultrasonic upwind time according to the ultrasonic echo signal in the downstream direction and the ultrasonic echo signal in the upstream direction, and calculate the wind speed based on the ultrasonic time difference method speed measurement principle;

[0008] Step 3: Transmit wind speed to the cloud server;

[0009] Step 4: Introduce a wind speed correction coefficient, and calculate the air volume of each total return air lane based on the wind speed, the lane cross-sectional area, and the wind speed correction coefficient;

[0010] Step 5: Calculate the amount of gas discharged from the air based on the air volume of each total return air lane and the gas volume of the corresponding total return air lane, and then calculate the total gas outflow volume of the mine in combination with the total gas extraction volume;

[0011] Step 6: Continuously display the change curve data of the wind-discharged gas volume, the total gas extraction volume and the total gas outflow volume of the mine; save the wind-discharged gas volume, the total gas extraction volume and the total gas outflow volume of the mine on a daily basis through the accumulation algorithm; and display the data of the wind-discharged gas volume, the total gas extraction volume and the total gas outflow volume of the mine in a graphical form by selecting a time period.

[0012] The present invention adopts an ultrasonic wind speed sensor to monitor the wind speed in the total return air tunnel of the mine, changing the traditional point wind speed sensor's "point-for-surface" monitoring method, and realizing the precise measurement of wind direction, air volume, wind speed and other data in the mine ventilation system. Based on the wind speed, the accurate gas wind displacement can be calculated, thereby ensuring the accuracy of the calculation of the total gas emission data of the mine, and improving the scientificity and completeness of the calculation of coal mine gas emission.

[0013] Preferably, in step 1, the transmitting end and the receiving end of the ultrasonic wind speed sensor are respectively fixed on the sides of the lane in a manner of one left and one right, one high and one low.

[0014] Preferably, the calculation formula for calculating the wind speed V based on the ultrasonic time difference method speed measurement principle in step 2 is:

[0015]

[0016] Where L is the ultrasonic path, i.e. the measurement distance, α is the angle between the sound wave direction and the wind direction, t abis the ultrasonic downwind time, t ba is the ultrasonic upwind time.

[0017] Preferably, in step 3, the wind speed is transmitted to the ground ring network switch through the underground industrial ring network switch, and then transmitted to the ground server through the optical cable. The ground server repackages the data to form a txt text file, and then maps the unique interface of the cloud server through the mine intranet gateway, and transmits the data to the cloud server in a packaged form.

[0018] Preferably, the wind speed correction coefficient C in step 4 is calculated by manually collecting the wind volume, and the calculation formula is:

[0019]

[0020] Among them, Q s V is the artificial air volume. s is the wind speed measured when the wind volume is collected manually, and S is the cross-sectional area of ​​the tunnel;

[0021] Air volume Q of each total return air channel i The calculation formula is:

[0022] Q i =V×C×S

[0023] Where V is the wind speed measured by the ultrasonic wind speed sensor.

[0024] Preferably, the gas exhaust volume Q in step 5 is 风排 The calculation formula is:

[0025]

[0026] Total gas emission in the mine Q Z The calculation formula is:

[0027]

[0028] Among them, V i is the wind speed of the ith total return air lane, C i is the wind speed correction coefficient of the ith total return air channel, S i is the cross-sectional area of ​​the i-th total return air lane, T i is the gas volume of the ith total return air channel, n is the number of total return air channels, Q 采 is the total gas extraction volume.

[0029] The present invention also provides a mine gas emission measurement system based on an ultrasonic wind speed sensor, the system comprising:

[0030] The data acquisition module is used to fix the transmitting end and the receiving end of the ultrasonic wind speed sensor on the sides of the laneway respectively, and collect ultrasonic echo signals in the downstream direction and the upstream direction;

[0031] A wind speed calculation module is used to determine the ultrasonic downwind time and the ultrasonic upwind time according to the ultrasonic echo signal in the downstream direction and the ultrasonic echo signal in the upstream direction, and calculate the wind speed based on the ultrasonic time difference method speed measurement principle;

[0032] A data transmission module, used to transmit wind speed to a cloud server;

[0033] The air volume calculation module is used to introduce the wind speed correction coefficient and calculate the air volume of each total return air lane based on the wind speed, lane cross-sectional area and wind speed correction coefficient;

[0034] The gas emission calculation module is used to calculate the gas emission volume based on the air volume of each total return air lane and the gas volume of the corresponding total return air lane, and then calculate the total gas emission volume of the mine in combination with the total gas extraction volume;

[0035] The data display module is used to continuously display the change curve data of the wind exhaust gas volume, the total gas extraction volume and the total gas outflow volume of the mine. Through the accumulation algorithm, the wind exhaust gas volume, the total gas extraction volume and the total gas outflow volume of the mine are saved on a daily basis. By selecting the time period, the data of the wind exhaust gas volume, the total gas extraction volume and the total gas outflow volume of the mine are displayed in a graphical form.

[0036] Preferably, in the data acquisition module, the transmitting end and the receiving end of the ultrasonic wind speed sensor are respectively fixed on the sides of the lane in a manner of one left and one right, one high and one low.

[0037] Preferably, the wind speed calculation module calculates the wind speed V based on the ultrasonic time difference method speed measurement principle as follows:

[0038]

[0039] Where L is the ultrasonic path, i.e. the measurement distance, α is the angle between the sound wave direction and the wind direction, t ab is the ultrasonic downwind time, t ba is the ultrasonic upwind time.

[0040] Preferably, the wind speed in the data transmission module is transmitted to the ground ring network switch through the underground industrial ring network switch, and then transmitted to the ground server through the optical cable. The ground server repackages the data to form a txt text file, and then maps the unique interface of the cloud server through the mine intranet gateway, and transmits the data to the cloud server in a packaged form.

[0041] Preferably, the wind speed correction coefficient C in the wind volume calculation module is obtained by manually collecting the wind volume, and the calculation formula is:

[0042]

[0043] Among them, Q s V is the artificial air volume. s is the wind speed measured when the wind volume is collected manually, and S is the cross-sectional area of ​​the tunnel;

[0044] Air volume Q of each total return air channel i The calculation formula is:

[0045] Q i =V×C×S

[0046] Where V is the wind speed measured by the ultrasonic wind speed sensor.

[0047] Preferably, the gas discharge volume Q in the gas outflow volume calculation module is 风排 The calculation formula is:

[0048]

[0049] Total gas emission in the mine Q Z The calculation formula is:

[0050]

[0051] Among them, V i is the wind speed of the ith total return air lane, C i is the wind speed correction coefficient of the ith total return air channel, S i is the cross-sectional area of ​​the i-th total return air lane, T i is the gas volume of the ith total return air channel, n is the number of total return air channels, Q 采 is the total gas extraction volume.

[0052] The advantages provided by the present invention are:

[0053] (1) The present invention adopts an ultrasonic wind speed sensor to monitor the wind speed of the total return air tunnel of the mine, changing the traditional point wind speed sensor's "point-for-surface" monitoring method, and realizing the precise measurement of wind direction, air volume, wind speed and other data in the mine ventilation system. Based on the wind speed, the accurate gas wind discharge volume can be calculated, thereby ensuring the accuracy of the calculation of the total gas emission volume of the mine, and improving the scientificity and integrity of the calculation of coal mine gas emission volume.

[0054] (2) By fixing the transmitting end and receiving end of the ultrasonic wind speed sensor on the sides of the tunnel in a left-right, high-and-low manner, that is, arranging the transmitting end and the receiving end on the sides of the tunnel in an inclined manner, the wind speed value passing through the inclined surface is measured, which can overcome the problem of unstable speed measurement caused by deformation and unstable cross-section of the underground tunnel, and can calculate a more stable and accurate wind speed value.

[0055] (3) The present invention establishes a mine gas emission analysis platform, which can calculate the change curve data of the wind exhaust gas volume, the total gas extraction volume and the total gas emission volume of the mine in real time. Through the accumulation algorithm, the wind exhaust gas volume, the total gas extraction volume and the total gas emission volume of the mine are saved on a daily basis. By selecting the time period, the data of the wind exhaust gas volume, the total gas extraction volume and the total gas emission volume of the mine are displayed in a graphical form, thereby ensuring the continuity of the three types of data. At the same time, it solves the problem that the mine gas emission volume cannot be calculated in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 A flow chart of a method for calculating the amount of gas emission in a mine based on an ultrasonic wind speed sensor provided in an embodiment of the present invention;

[0057] Figure 2 A schematic diagram of the arrangement of ultrasonic wind speed sensors in a method for calculating the amount of gas emission in a mine based on ultrasonic wind speed sensors provided in an embodiment of the present invention;

[0058] Figure 3 A schematic diagram of the ultrasonic wind speed sensor measurement in the method for calculating the amount of gas emission in a mine based on an ultrasonic wind speed sensor provided in an embodiment of the present invention;

[0059] Figure 4 A schematic diagram of data transmission of an ultrasonic wind speed sensor in a method for calculating the amount of gas emission in a mine based on an ultrasonic wind speed sensor provided in an embodiment of the present invention;

[0060] Figure 5 An example diagram of the application of the method for calculating the amount of gas emission in a mine based on an ultrasonic wind speed sensor provided in an embodiment of the present invention;

[0061] Figure 6 A schematic diagram of a mine gas emission measurement system based on an ultrasonic wind speed sensor provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0062] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the technical solution of the present invention is clearly and completely described below in combination with specific embodiments and with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments 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.

[0063] like Figure 1 As shown, this embodiment provides a method for calculating the amount of gas emission in a mine based on an ultrasonic wind speed sensor, comprising the following steps:

[0064] Step 1: Fix the transmitting end and receiving end of the ultrasonic wind speed sensor on the sides of the lane in a left-right, high-low manner, such as Figure 2 As shown, the distance between the transmitting end and the receiving end ranges from 1m to 12m, and ultrasonic echo signals in the downstream direction and the upstream direction are collected;

[0065] Step 2: Determine the ultrasonic downwind time t according to the ultrasonic echo signal in the downstream direction and the ultrasonic echo signal in the upstream direction. ab and ultrasonic upwind time t ba , the wind speed is calculated based on the ultrasonic time difference method;

[0066] See also Figure 3 The ultrasonic wind speed sensor adopts the ultrasonic time difference method to measure speed. It uses the time difference produced by the different time required for sound waves to propagate the same distance downstream and upstream in the fluid. The difference in propagation time is proportional to the flow velocity of the measured fluid. The flow velocity of the fluid is calculated based on the measured time difference.

[0067] The calculation formula of wind speed V based on the ultrasonic time difference method speed measurement principle is:

[0068]

[0069] Where V is the wind speed in m / s, L is the ultrasonic path, that is, the measurement distance between the transmitter and the receiver in m, α is the angle between the sound wave direction and the wind direction, t ab is the ultrasonic downwind time, t ba is the ultrasonic upwind time.

[0070] The present invention takes into account that the total return air tunnel is relatively long, and the existing point wind speed sensor can only monitor the wind speed at the hanging point and cannot fully reflect the wind speed conditions of the entire tunnel. The present invention adopts an ultrasonic wind speed sensor to measure the wind speed, and fixes the transmitting end and the receiving end of the ultrasonic wind speed sensor on the sides of the tunnel in a left-right, high-and-low manner, that is, the transmitting end and the receiving end are arranged on the sides of the tunnel in an inclined manner, and the wind speed value passing through the inclined surface is measured, which can overcome the problem of unstable speed measurement caused by deformation of the underground tunnel and unstable cross-section, and can calculate a more stable and accurate wind speed value.

[0071] Step 3: Transmit wind speed to the cloud server;

[0072] like Figure 4 As shown, the data of the ultrasonic wind speed sensor is transmitted to the ground ring network switch through the underground industrial ring network switch, and then transmitted to the industrial computer, that is, the ground server, through the optical cable. The ground server repackages the data to form a txt text file, and then maps the unique interface of the cloud server through the mine intranet network gate, and transmits the data to the cloud server in the form of packaging. The cloud server cannot access the intranet. This data transmission method is one-way transmission, which protects the security of the mine industrial intranet, so that the data transmission method of the present invention can be used uniformly with the data of the security monitoring system. The sensor of the security monitoring system adopts node upload, that is, the transmission method of IP is limited. Other sensors such as optical fiber microseismic sensor monitoring data are displayed in the intranet. At the same time, the cloud server collects the data of the security monitoring system at the same time. In the same database, the data of the two different systems are processed collectively, and then classified, point aligned, and used according to certain rules. Through the cloud data method, a data pool is established to integrate the data collected by the security monitoring system and the ultrasonic wind speed sensor, etc., and the two data are integrated and used to complement each other and make up for their respective shortcomings.

[0073] Step 4: Introduce the wind speed correction coefficient C, and calculate the air volume Q of each total return air lane based on the wind speed V, the tunnel cross-sectional area S, and the wind speed correction coefficient C. i ;

[0074] The wind speed correction coefficient C is calculated by manually collecting the wind volume, and the calculation formula is:

[0075]

[0076] Among them, Q s To collect wind volume manually, it can be measured by a handheld anemometer, V sIt is the wind speed measured when manually collecting wind volume, which can be measured by a wind speed sensor. The wind speed sensor can be an ultrasonic wind speed sensor or a point wind speed sensor. S is the cross-sectional area of ​​the tunnel, which can be found through manually entered basic information data. The wind speed correction coefficient of the ultrasonic wind speed sensor is 1.

[0077] Air volume Q of each total return air channel i The calculation formula is:

[0078] Q i =V×C×S

[0079] Where V is the wind speed measured by the ultrasonic wind speed sensor.

[0080] Step 5: Based on the air volume Q of each total return air channel i and the gas volume T collected by the gas sensor in the corresponding total return air channel i Calculate the exhaust gas volume Q 风排 , combined with the total gas extraction volume Q obtained from the ground gas pumping station 采 Calculate the total gas emission Q of the mine Z .

[0081] Air exhaust gas volume Q 风排 The calculation formula is:

[0082]

[0083] Total gas emission in the mine Q Z The calculation formula is:

[0084]

[0085] Wherein, n represents the total number of return air lanes.

[0086] Step 6: Continuously display the exhaust gas volume Q 风排 , Total gas extraction volume Q 采 and the total gas emission in the mine Q Z The change curve data of the wind exhaust gas volume Q is saved on a daily basis through the accumulation algorithm. 风排 , Total gas extraction volume Q 采 and the total gas emission in the mine Q Z , by selecting the time period, the exhaust gas volume Q 风排 , Total gas extraction volume Q 采 and the total gas emission in the mine Q Z The data is displayed in a graphical form. 风排 , Total gas extraction volume Q 采 and the total gas emission in the mine Q Z Through statistics and analysis in the form of charts, the amount of exhaust gas Q风排 , Total gas extraction volume Q 采 and the total gas emission in the mine Q Z They are all instantaneous values ​​obtained in real time. Since the database is updated by variables, the sensor value does not change between the time corresponding to the two values. The instantaneous value can be regarded as the average value within the time period, and the cumulative value of different time periods can be calculated by the instantaneous value accumulation calculation method, such as Figure 5 As shown, for example, cumulative calculation can be performed based on the three dimensions of year, month, and day.

[0087] Conventional wind measuring probes are installed 20cm below the top of the tunnel, and measure the "point wind speed" there. Due to the positional relationship, it is obviously inaccurate to use it to represent the average wind speed of the entire tunnel. However, manual wind measurement is inefficient, problems are not discovered and solved in a timely manner, and the measurement value error is relatively large. Therefore, for a long time, problems such as real-time monitoring and processing of air leakage in ventilation work, formulation and implementation of optimal air adjustment and control plans, and management of ventilation energy efficiency have not been implemented. The ultrasonic wind speed sensor of the present application uses an ultrasonic scanning wind measurement method to collect wind speed data, which changes the traditional "point-for-surface" monitoring method, and realizes the accurate measurement of wind direction, air volume, wind speed and other data in the mine ventilation system. Based on the wind speed, the accurate gas wind displacement can be calculated, and then the accuracy of the calculation of the total gas emission data of the mine can be guaranteed, the scientificity and integrity of the calculation of coal mine gas emission volume can be improved, and the investment in manpower and material resources can be reduced. At the same time, it provides a scientific basis for coal mine methane emission control and response measures, formulates control targets in stages, strengthens research on gas extraction and utilization technologies, and provides relevant decision-making support for increasing policy support for gas utilization.

[0088] like Figure 6 As shown, the present invention also provides a mine gas emission measurement system based on an ultrasonic wind speed sensor, comprising:

[0089] The data acquisition module is used to fix the transmitting end and the receiving end of the ultrasonic wind speed sensor on the sides of the laneway in a left-right and a high-low manner, respectively, to collect ultrasonic echo signals in the downstream direction and the upstream direction;

[0090] The wind speed calculation module is used to determine the ultrasonic downwind time t according to the ultrasonic echo signal in the downstream direction and the ultrasonic echo signal in the upstream direction. ab and ultrasonic upwind time t ba , the wind speed is calculated based on the ultrasonic time difference method speed measurement principle; the calculation formula for wind speed V based on the ultrasonic time difference method speed measurement principle is:

[0091]

[0092] Where L is the ultrasonic path, i.e. the measurement distance, α is the angle between the sound wave direction and the wind direction, t ab is the ultrasonic downwind time, t ba is the ultrasonic upwind time.

[0093] The data transmission module is used to transmit the wind speed to the cloud server; the wind speed is transmitted to the ground ring network switch through the underground industrial ring network switch, and then transmitted to the ground server through the optical cable. The ground server repackages the data to form a txt text file, and then maps the cloud server's unique interface through the mine intranet gateway, and transmits the data to the cloud server in a packaged form.

[0094] The air volume calculation module is used to introduce the wind speed correction coefficient C, and calculate the air volume Q of each total return air lane based on the wind speed V, the tunnel cross-sectional area S, and the wind speed correction coefficient C. i ; Among them, the wind speed correction coefficient C is calculated by manually collecting the wind volume, and the calculation formula is:

[0095]

[0096] Among them, Q s V is the artificial air volume, s It is the wind speed measured when the wind volume is collected manually, and S is the cross-sectional area of ​​the tunnel.

[0097] Air volume Q of each total return air channel i The calculation formula is:

[0098] Q i =V×C×S

[0099] Where V is the wind speed measured by the ultrasonic wind speed sensor.

[0100] Gas outflow calculation module, used to calculate the air volume Q of each total return air channel i and the gas volume T collected by the gas sensor in the corresponding total return air channel i Calculate the exhaust gas volume Q 风排 , combined with the total gas extraction volume Q obtained from the ground gas pumping station 采 Calculate the total gas emission Q of the mine Z Among them, the amount of exhaust gas Q 风排 The calculation formula is:

[0101]

[0102] Total gas emission in the mine Q z The calculation formula is:

[0103]

[0104] Wherein, n represents the total number of return air lanes.

[0105] The data display module is used to continuously display the change curve data of the wind exhaust gas volume, the total gas extraction volume and the total gas outflow volume of the mine. Through the accumulation algorithm, the wind exhaust gas volume, the total gas extraction volume and the total gas outflow volume of the mine are saved on a daily basis. By selecting the time period, the data of the wind exhaust gas volume, the total gas extraction volume and the total gas outflow volume of the mine are displayed in a graphical form.

[0106] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for calculating the amount of gas emission in a mine based on an ultrasonic wind speed sensor, characterized in that: The method comprises: Step 1, fix the transmitting end and the receiving end of the ultrasonic wind speed sensor on the sides of the laneway respectively, and collect ultrasonic echo signals in the downstream direction and the upstream direction; Step 2: Determine the ultrasonic downwind time and the ultrasonic upwind time according to the ultrasonic echo signal in the downstream direction and the ultrasonic echo signal in the upstream direction, and calculate the wind speed based on the ultrasonic time difference method speed measurement principle; Step 3: Transmit wind speed to the cloud server; Step 4: Introduce a wind speed correction coefficient, and calculate the air volume of each total return air lane based on the wind speed, the lane cross-sectional area, and the wind speed correction coefficient; Step 5: Calculate the amount of gas discharged from the air based on the air volume of each total return air lane and the gas volume of the corresponding total return air lane, and then calculate the total gas outflow volume of the mine in combination with the total gas extraction volume; Step 6: Continuously display the change curve data of the wind-discharged gas volume, the total gas extraction volume and the total gas outflow volume of the mine; save the wind-discharged gas volume, the total gas extraction volume and the total gas outflow volume of the mine on a daily basis through the accumulation algorithm; and display the data of the wind-discharged gas volume, the total gas extraction volume and the total gas outflow volume of the mine in a graphical form by selecting a time period.

2. The method for calculating the amount of gas emission in a mine based on an ultrasonic wind speed sensor according to claim 1 is characterized in that: In the step 1, the transmitting end and the receiving end of the ultrasonic wind speed sensor are respectively fixed on the sides of the lane in a manner of one left and one right, one high and one low.

3. The method for calculating the amount of gas emission in a mine based on an ultrasonic wind speed sensor according to claim 1 is characterized in that: The calculation formula for calculating the wind speed V in step 2 based on the ultrasonic time difference method speed measurement principle is: Where L is the ultrasonic path, i.e. the measurement distance, α is the angle between the sound wave direction and the wind direction, t ab is the ultrasonic downwind time, t ba is the ultrasonic upwind time.

4. The method for calculating the amount of gas emission in a mine based on an ultrasonic wind speed sensor according to claim 1 is characterized in that: In step 3, the wind speed is transmitted to the ground ring network switch through the underground industrial ring network switch, and then transmitted to the ground server through the optical cable. The ground server repackages the data to form a txt text file, and then maps the unique interface of the cloud server through the mine intranet gateway, and transmits the data to the cloud server in a packaged form.

5. The method for calculating the amount of gas emission in a mine based on an ultrasonic wind speed sensor according to claim 1 is characterized in that: The wind speed correction coefficient C in step 4 is calculated by manually collecting the wind volume, and the calculation formula is: Among them, Q s V is the artificial air volume. s is the wind speed measured when the wind volume is collected manually, and S is the cross-sectional area of ​​the tunnel; Air volume Q of each total return air channel i The calculation formula is: Q i =V×C×S Where V is the wind speed measured by the ultrasonic wind speed sensor.

6. The method for calculating the amount of gas emission in a mine based on an ultrasonic wind speed sensor according to claim 1 is characterized in that: The amount of gas discharged during the step 5 is Q 风排 The calculation formula is: Total gas emission in the mine Q z The calculation formula is: Among them, V i is the wind speed of the ith total return air lane, C i is the wind speed correction coefficient of the ith total return air channel, S i is the cross-sectional area of ​​the i-th total return air lane, T i is the gas volume of the ith total return air channel, n is the number of total return air channels, Q 采 is the total gas extraction volume.

7. The mine gas emission measurement system based on ultrasonic wind speed sensor is characterized by: The system comprises: The data acquisition module is used to fix the transmitting end and the receiving end of the ultrasonic wind speed sensor on the sides of the laneway respectively, and collect ultrasonic echo signals in the downstream direction and the upstream direction; A wind speed calculation module is used to determine the ultrasonic downwind time and the ultrasonic upwind time according to the ultrasonic echo signal in the downstream direction and the ultrasonic echo signal in the upstream direction, and calculate the wind speed based on the ultrasonic time difference method speed measurement principle; A data transmission module, used to transmit wind speed to a cloud server; The air volume calculation module is used to introduce the wind speed correction coefficient and calculate the air volume of each total return air lane based on the wind speed, lane cross-sectional area and wind speed correction coefficient; The gas emission calculation module is used to calculate the gas emission volume based on the air volume of each total return air lane and the gas volume of the corresponding total return air lane, and then calculate the total gas emission volume of the mine in combination with the total gas extraction volume; The data display module is used to continuously display the change curve data of the wind exhaust gas volume, the total gas extraction volume and the total gas outflow volume of the mine. Through the accumulation algorithm, the wind exhaust gas volume, the total gas extraction volume and the total gas outflow volume of the mine are saved on a daily basis. By selecting the time period, the data of the wind exhaust gas volume, the total gas extraction volume and the total gas outflow volume of the mine are displayed in a graphical form.

8. The mine gas emission measurement system based on ultrasonic wind speed sensor according to claim 7 is characterized in that: In the data acquisition module, the transmitting end and the receiving end of the ultrasonic wind speed sensor are respectively fixed on the lane walls at both sides of the lane in a manner of one left and one right, one high and one low.

9. The mine gas emission measurement system based on ultrasonic wind speed sensor according to claim 7 is characterized in that: The wind speed calculation module calculates the wind speed V based on the ultrasonic time difference method speed measurement principle as follows: Where L is the ultrasonic path, i.e. the measurement distance, α is the angle between the sound wave direction and the wind direction, t ab is the ultrasonic downwind time, t ba is the ultrasonic upwind time.

10. The mine gas emission measurement system based on ultrasonic wind speed sensor according to claim 7 is characterized in that: In the data transmission module, the wind speed is transmitted to the ground ring network switch through the underground industrial ring network switch, and then transmitted to the ground server through the optical cable. The ground server repackages the data to form a txt text file, and then maps the unique interface of the cloud server through the mine intranet gateway, and transmits the data to the cloud server in a packaged form.

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