Mine fan drift carbon emission gas measuring device

Abstract

The utility model belongs to the field of coal mine gas emission detection, and particularly discloses a coal mine fan drift carbon emission gas measuring device. The device comprises a wind speed sensing unit, a gas concentration sensing unit and a temperature, humidity and pressure sensing unit, and acquisition ends of the sensing units are arranged at fixed points reserved in the fan drift and are respectively used for measuring discharge wind speed, gas concentration and temperature, humidity and pressure information in the mine fan drift. The gas concentration sensing unit comprises a carbon monoxide gas concentration sensing unit, a carbon dioxide gas concentration sensing unit and a methane gas concentration sensing unit, and the carbon monoxide gas concentration sensing unit, the carbon dioxide gas concentration sensing unit and the methane gas concentration sensing unit are respectively used for measuring concentration information of gases such as carbon monoxide, carbon dioxide and methane. Furthermore, the purpose of accurately measuring the emission of various carbon gases can be achieved by matching with the concentration information of the carbon emission gases measured by various gas concentration sensing units.

Description

Technical Field

[0001] This utility model belongs to the field of coal mine gas emission detection, and specifically relates to a device for measuring carbon emission gas from mine ventilation shafts. Background Technology

[0002] During the formation and metamorphism of coal, gases such as carbon monoxide, carbon dioxide, and methane are generated. Some of these gases are extracted and utilized during coal mining, while others are released into the atmosphere, including those released into the atmosphere during post-mining washing, beneficiation, storage, and transportation.

[0003] For coal mines, it is necessary to accurately monitor gases such as carbon monoxide, carbon dioxide, and methane generated and emitted during the production process. Existing monitoring methods mainly rely on coal conversion accounting and satellite mobile monitoring.

[0004] However, existing monitoring methods are not accurate enough for monitoring carbon emissions from near-site coal mines. Therefore, there is a need to develop a carbon emission gas measurement device for mine ventilation shafts to achieve accurate measurement of carbon emissions from coal mine ventilation shafts. Utility Model Content

[0005] The purpose of this invention is to provide a coal mine ventilation shaft carbon emission gas measuring device, which accurately monitors the gas discharged from the main ventilation shaft of a coal mine to achieve the goal of accurately measuring coal mine carbon gas emissions.

[0006] To achieve the above objectives, this utility model adopts the following technical solution:

[0007] A device for measuring carbon emissions from a mine ventilation shaft includes a host computer and a sensing unit; wherein the sensing unit includes a wind speed sensing unit, a gas concentration sensing unit, and a temperature, humidity, and pressure sensing unit.

[0008] The wind speed sensing unit, gas concentration sensing unit, and temperature, humidity and pressure sensing unit are all connected to the host computer.

[0009] Each sensing unit's acquisition terminal is located inside the mine ventilation shaft, and is used to detect the exhaust wind speed, gas concentration, and temperature, humidity, and pressure information inside the mine ventilation shaft, and upload the collected information to the host computer.

[0010] Preferably, the mine ventilation shaft carbon emission gas measuring device further includes a cluster penetration protection unit; wherein, the cluster penetration protection unit is installed on the ventilation shaft wall, with one end connected to the outside of the ventilation shaft and the other end connected to the inside of the ventilation shaft;

[0011] The bundle tubes or cables leading out from the acquisition end of each sensing unit pass through the mine ventilation shaft via the bundled tunnel protection unit.

[0012] Preferably, the cluster penetration protection unit includes an input cover, an output cover, and a cluster penetration pipe; wherein the input cover and the output cover are respectively connected to one end of the cluster penetration pipe and are located inside and outside the wind tunnel, respectively, and the cluster penetration pipe penetrates the wind tunnel wall.

[0013] The cross-sectional dimensions of the input and output covers are both larger than those of the bundled tube; mesh plates for the bundled tube to pass through are installed at both ends inside the bundled tube, through which the bundled tube or cable passes out through the holes in the mesh plates.

[0014] Preferably, the mine ventilation shaft carbon emission gas measuring device further includes a measuring bracket; wherein, the measuring bracket is vertically installed at a certain cross-section of the mine ventilation shaft, and the acquisition end of each sensing unit is installed on the measuring bracket.

[0015] Preferably, the measuring support is a mesh structure formed by the cross connection of several transverse and longitudinal mounting rods, wherein the size of the mesh structure is adapted to the size of the cross section of the wind tunnel, and the edge of the mesh structure is fixed to the wall of the wind tunnel.

[0016] Preferably, the grid area formed by the cross connection of horizontal and vertical mounting rods is the wind speed sensing area;

[0017] The wind speed sensing unit consists of multiple sets, with each unit installed in a corresponding grid area. Its acquisition end extends to the center of the corresponding grid area and is used to measure the wind speed within that grid area.

[0018] Preferably, the wind speed sensing unit includes a dynamic pressure sensor and a dynamic pressure transmitter; wherein multiple sets of dynamic pressure sensors are provided, and each set of dynamic pressure sensors is arranged at a reserved dynamic pressure measurement point in the mine ventilation shaft;

[0019] The number of dynamic pressure sensors and dynamic pressure transmitters are equal and they are connected in a one-to-one correspondence;

[0020] Each dynamic pressure transmitter is located outside the mine ventilation shaft, and each dynamic pressure transmitter is connected to the host computer.

[0021] Preferably, each set of dynamic pressure sensors includes two pitot tubes;

[0022] Both pitot tubes are installed back-to-back facing downwards, with the sampling ports of the pitot tubes facing downwards. One pitot tube's sampling port is positioned facing the wind, while the other pitot tube's sampling port is positioned leewards.

[0023] The two pitot tubes are each connected to a data acquisition port of the dynamic pressure transmitter via an independent bundle tube.

[0024] Preferably, the temperature, humidity and pressure sensing unit includes a temperature, humidity and pressure sensor and a temperature, humidity and pressure transmitter; wherein, there is one or more sets of temperature, humidity and pressure sensors, and the temperature, humidity and pressure sensors are arranged on the temperature, humidity and pressure measurement points reserved in the mine ventilation shaft;

[0025] Among them, the temperature, humidity and pressure transmitters are located outside the mine ventilation shaft, and the number of temperature, humidity and pressure sensors corresponds one-to-one with the number of temperature, humidity and pressure transmitters, and the two are connected by cables; each temperature, humidity and pressure transmitter is connected to the host computer.

[0026] Preferably, the gas concentration sensing unit includes methane, carbon monoxide, and carbon dioxide gas concentration sensing units; each of the three gas concentration sensing units consists of a separate gas extraction sensing unit and a corresponding gas concentration sensor.

[0027] The gas extraction sensing unit includes a bundle tube, an extraction pump, a filtration unit, and a cold drying and dehydration unit;

[0028] One end of the bundle tube in the gas extraction sensing unit is arranged at the gas concentration measurement point reserved in the mine ventilation shaft; the extraction pump, filter unit, cold drying and dehydration unit and gas concentration sensor are all located outside the mine ventilation shaft;

[0029] The bundle tube in the gas extraction sensing unit is led out from the mine ventilation shaft and connected in sequence to the filtration unit, extraction pump, cold drying and dewatering unit, and the corresponding gas concentration sensor; each gas concentration sensor is connected to the host computer.

[0030] This utility model has the following advantages:

[0031] As described above, this utility model relates to a carbon emission gas measuring device for a mine ventilation shaft. The device includes a wind speed sensing unit, a gas concentration sensing unit, and a temperature, humidity, and pressure sensing unit, which are respectively used to measure the emission wind speed, gas concentration, and temperature, humidity, and pressure information within the mine ventilation shaft. The gas concentration sensing unit includes three types: carbon monoxide, carbon dioxide, and methane gas concentration sensing units, which are respectively used to measure the concentration information of carbon monoxide, carbon dioxide, and methane. By acquiring the emission wind speed and temperature, humidity, and pressure information within the mine ventilation shaft, this utility model can obtain an accurate total flow rate of the ventilation shaft. Furthermore, by combining this with the carbon emission gas concentration information measured by the various gas concentration sensing units, it can achieve the purpose of accurately measuring the emissions of various carbon gases. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall carbon emission gas measuring device in the mine ventilation shaft according to Embodiment 1 of this utility model;

[0033] Figure 2 This is a schematic diagram of the arrangement of the carbon emission gas measuring device in the mine ventilation shaft in Embodiment 1 of this utility model;

[0034] Figure 3 for Figure 2 Enlarged view of part A in the image;

[0035] Figure 4 This is a schematic diagram of the dynamic pressure sensor fixing unit in an embodiment of the present invention; wherein (a) is a front view of the Pitot tube installation; (b) is a side view of the Pitot tube installation; and (c) is a rear view of the Pitot tube installation.

[0036] Figure 5 This is a schematic diagram of the structure of the bundled tunnel protection unit in an embodiment of the present invention;

[0037] Figure 6 This is a schematic diagram of the structure of the perforated plate in an embodiment of this utility model;

[0038] Figure 7 This is a schematic diagram of the structure of the distributed data transmission unit in this embodiment of the present invention;

[0039] Figure 8 This is a schematic diagram of the carbon monoxide gas concentration sensing unit in an embodiment of this utility model.

[0040] The components are: 1-dynamic pressure sensor, 2-measuring bracket, 3-horizontal mounting rod, 4-vertical mounting rod, 5-Pitot tube, 6-dynamic pressure sensor fixing unit, 7-upper sensor fixing slot, 8-lower Pitot tube mounting plate, 9-fixing component, 10-cluster penetration protection unit, 11-input cover, 12-output cover, 13-cluster penetration tube, 14-mesh hole, 15-air duct wall, 16-cluster tube, 17-temperature, humidity and pressure sensor, 18-temperature, humidity and pressure transmitter, 19-dynamic pressure transmitter, 20-distributed data transmission unit, 21-cluster junction box; 22-mesh plate, 23-temperature, humidity and pressure signal line, 24-distributed data transmission unit housing, 25-grid area. Detailed Implementation

[0041] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0042] like Figure 1 As shown in the figure, this embodiment describes a coal mine ventilation shaft carbon emission gas measuring device, which includes a host computer and a sensing unit.

[0043] The host computer is used to control the synchronous sampling, sensing, and data processing of various information. The sensing unit is used to collect various parameters required for carbon monitoring, such as temperature, humidity, pressure, ventilation shaft exhaust velocity, and concentrations of methane, carbon monoxide, and carbon dioxide.

[0044] Specifically, the sensing unit includes a wind speed sensing unit, a gas concentration sensing unit, and a temperature, humidity, and pressure sensing unit. The wind speed sensing unit, gas concentration sensing unit, and temperature, humidity, and pressure sensing unit are all connected to a host computer.

[0045] The acquisition terminals of all the above sensing units are located inside the mine ventilation shaft, and are used to detect the exhaust wind speed, gas concentration, and temperature, humidity and pressure information inside the mine ventilation shaft, and upload the collected information to the host computer.

[0046] Specifically, the wind speed sensing unit is used to measure the exhaust velocity of the wind tunnel.

[0047] There are three gas concentration sensing units, namely methane, carbon monoxide, and carbon dioxide gas concentration sensing units. The three gas concentration sensing units are used to measure the concentration of methane, carbon monoxide, and carbon dioxide in the ventilation shaft, respectively.

[0048] Temperature, humidity, and pressure sensors are used to measure temperature, humidity, and pressure information inside the ventilation shaft.

[0049] Calculating carbon emissions from coal mines requires simultaneous and accurate measurement of the concentration of various carbon gases and the air volume within the ventilation shaft, followed by calculation. Traditionally, there are two methods for measuring the air volume of the ventilation shaft:

[0050] One method is the direct method, which uses wind speed sensors to directly measure wind speed and air volume.

[0051] Secondly, ultrasonic sensors are installed in the same air duct to detect wind speed.

[0052] However, due to factors such as high dust concentration and high humidity in the return airflow, the sensors of the two methods mentioned above are often clogged, requiring frequent manual cleaning, which makes it impossible to guarantee the safety of the cleaning process and the personal safety of the workers.

[0053] To address the aforementioned problems, this invention proposes an indirect method for accurate airflow sensing. This method involves measuring the vertical and frontal pressures of the wind at a measurement point, calculating the dynamic pressure based on the pressure difference between the two, and then deriving and calculating the wind velocity.

[0054] To achieve accurate indirect airflow sensing, the wind speed sensing unit employs a dynamic pressure sensing unit.

[0055] The wind speed sensing unit includes a dynamic pressure sensor and a dynamic pressure transmitter; wherein the dynamic pressure sensor 1 is provided with one or more sets, and each set of dynamic pressure sensors is arranged at a dynamic pressure measurement point reserved in the mine ventilation shaft.

[0056] The number of dynamic pressure sensors 1 and dynamic pressure transmitters is equal, and they are connected one-to-one. Each dynamic pressure transmitter is located outside the mine ventilation shaft, and each dynamic pressure transmitter is connected to a host computer to upload the collected dynamic pressure information.

[0057] like Figure 2 As shown, since fluid wind speed is difficult to measure accurately, this utility model is designed to arrange multiple points in the same cross section of the wind tunnel for dynamic pressure measurement. Thus, the wind speed of the cross section at the same moment can be accurately measured by wind speed calculation method.

[0058] Within the same cross section of the wind tunnel, the wind speed can be considered to be uniform within a very close range. Therefore, the same cross section within the wind tunnel is divided into multiple parts, and the dynamic pressure of each part is calculated by measuring the dynamic pressure of a dynamic pressure sensor 1.

[0059] In order to enable the installation of each dynamic pressure sensor 1 in the ventilation shaft, the mine ventilation shaft carbon emission gas measuring device also includes a measuring bracket 2; wherein, the measuring bracket 2 is vertically installed at a certain cross section of the ventilation shaft.

[0060] Each dynamic pressure sensor 1 has its acquisition end mounted on the measuring bracket 2 to acquire the corresponding information.

[0061] In this embodiment, the measuring bracket 2 is mainly used to fix and support each dynamic pressure sensor 1. The acquisition ends of the gas concentration sensing unit and the temperature, humidity and pressure sensing unit can also be fixed on the measuring bracket 2.

[0062] In order to accurately measure wind speed, this utility model is designed with a multi-point measurement method. The measuring bracket 2 is used to fix and support each dynamic pressure sensor 1 during multi-point measurement. Therefore, its material is generally steel reinforcement.

[0063] The measuring support 2 is a mesh structure formed by the cross connection of several transverse mounting rods 3 and longitudinal mounting rods 4. The size of the mesh structure is adapted to the size of the cross section of the wind tunnel, and the edge of the mesh structure is fixed to the wall of the wind tunnel.

[0064] Specifically, mounting blocks are welded to the ends of the horizontal mounting rod 3 and the longitudinal mounting rod 4. The mounting blocks are square blocks with mounting holes pre-set on them. Expansion bolt holes are set on the inner wall of the wind tunnel at the positions corresponding to the mounting holes.

[0065] The various fixing points (i.e., mounting blocks) of the network structure are fixed to the corresponding positions on the inner wall of the ventilation shaft using bolts. Since the measuring bracket 2 in this embodiment is a network structure, it will not affect the airflow inside the ventilation shaft.

[0066] The grid area 25 formed by the cross connection of the horizontal mounting rod 3 and the vertical mounting rod 4 is the wind speed sensing area.

[0067] The wind speed sensing unit consists of multiple sets, and each wind speed sensing unit (dynamic pressure sensor 1) is installed in a corresponding grid area, with its acquisition end extending to the center of the corresponding grid area, and is used to measure the wind speed in that grid area.

[0068] like Figure 2 As shown, the number of dynamic pressure sensors 1 is, for example, 25, forming a 5×5 array arrangement, which is just right for measuring the wind speed at different positions of the same cross section of the wind tunnel, which is conducive to achieving accurate measurement of the wind tunnel air volume.

[0069] like Figure 4 As shown, each set of dynamic pressure sensors 1 includes two Pitot tubes 5. The dynamic pressure sensor 1 uses the Pitot tubes 5 for measurement. The dynamic pressure can be calculated by measuring the normal force and lateral pressure of the fluid, and is used to calculate the gas emission.

[0070] This invention divides the entire cross-section of a mine ventilation shaft into multiple small measuring sections. By measuring the dynamic pressure of each small section using a set of dynamic pressure sensors 1, the accurate air volume of the entire ventilation shaft cross-section can be obtained.

[0071] Let P be the vertical airflow pressure at the i-th measuring point. ic The pressure is P. iy Then the dynamic pressure P id The calculation method is as follows:

[0072] ;

[0073] Where i is the number of the dynamic pressure sensor measurement point, i=1,2,3……n, and n is the total number of dynamic pressure measurement sensors.

[0074] The uniform wind speed within the small cross-section of the measurement point is:

[0075] .

[0076] in Let the air density at the measurement point be denoted as . The overall flow rate of the ventilation shaft can then be calculated using the following formula:

[0077] .

[0078] in S represents the total flow rate of the ventilation shaft, and S represents the total cross-sectional area of ​​the ventilation shaft at the measurement point.

[0079] Both pitot tubes 5 are installed back-to-back facing downwards, with the sampling ports of the pitot tubes facing downwards. The sampling port of one pitot tube 5 is arranged facing the wind, while the sampling port of the other pitot tube 5 is arranged facing away from the wind.

[0080] Two pitot tubes 5 are each connected to a data acquisition port of the dynamic pressure transmitter via an independent bundle tube. The two pitot tubes 5 perform total pressure measurement and static pressure measurement respectively, and transmit the data to the dynamic pressure transmitter through the bundle tube.

[0081] To facilitate the installation of the dynamic pressure sensor 1, a dynamic pressure sensor fixing unit 6 is also provided, such as... Figure 2 As shown, the dynamic pressure sensor 1 is installed on the measurement bracket 2 through the dynamic pressure sensor fixing unit 6, for example.

[0082] As Figure 4 shown, the dynamic pressure sensor fixing unit 6 includes an upper sensor fixing groove 7 and a lower pitot tube mounting plate 8. Among them, the upper sensor fixing groove 7 is installed on the transverse mounting rod 3 of the dynamic pressure sensor bracket and fastened.

[0083] The cross-section of the upper sensor fixing groove 7 is in a horizontally arranged U shape, and mounting holes are opened at corresponding positions on the top plate and the bottom plate of the U-shaped structure. The upper sensor fixing groove is inserted onto the transverse mounting rod 3 and fastened by bolts and nuts.

[0084] The lower pitot tube mounting plate 8 is connected to the bottom of the upper sensor fixing groove 7 and is vertically arranged; among them, the surface of the lower pitot tube mounting plate 8 is arranged in the direction consistent with the air flow in the mine air drift.

[0085] Among them, the two pitot tubes 5 of each group of dynamic pressure sensors are both installed on the same surface of the lower pitot tube mounting plate 8. This arrangement can ensure that after the dynamic pressure sensor fixing unit 6 is fixed, one sampling port faces the wind and one sampling port faces away from the wind.

[0086] The bundle tube connection ports of the two pitot tubes 5 are both located at the upper end, and the sides of the two pitot tubes 5 are welded together to form a structure similar to a "Y" shape, and are installed on the lower pitot tube mounting plate through one or more fixing members 9 and fastened by bolts.

[0087] Among them, the fixing member 9 is in a "U" shape and can simultaneously fasten the two pitot tubes 5. This fixing method can ensure that the sampling ports of the two pitot tubes 3 are placed back to back and (approximately) collect data at the same point.

[0088] The dynamic pressure sensor fixing unit 6 cooperates with the measurement bracket 2 to achieve the installation and fixation of the dynamic pressure sensor 1, measure the wind speed at the expected position in the air drift, and at the same time, this fixing device can adjust the position of the dynamic pressure sensor, adopting the downward installation method of the pitot tube.

[0089] The above installation method can prevent the influence of dust on the sensor measurement and can also perform self-drainage, avoiding the blockage of the dynamic pressure sensor 1, and at the same time saving the trouble of manual cleaning, ensuring the safety of cleaning construction and the personal safety of construction workers.

[0090] In addition, since the dynamic pressure transmitter 19 is located outside the air drift, therefore, the bundle tube connecting the pitot tube 5 and the dynamic pressure transmitter needs to pass through the air drift wall. Therefore, the present utility model also designs a special bundle tube through-the-drift protection unit 10.

[0091] The clustered tunnel protection unit 10 is installed on the wall of the ventilation shaft, with one end connected to the outside of the ventilation shaft and the other end connected to the inside of the ventilation shaft. The bundled tubes or cables led out from the acquisition ends of each sensing unit pass through the clustered tunnel protection unit and exit the mine ventilation shaft.

[0092] like Figure 5 As shown, the cluster tunnel protection unit 10 includes an input cover 11, an output cover 12, and a cluster tunnel pipe 13; wherein the input cover and the output cover are respectively connected to one end of the cluster tunnel pipe and are located inside and outside the wind tunnel.

[0093] A clustered through-hole is provided on the wall of the air tunnel, and the clustered through-hole 13 passes through the wall of the air tunnel.

[0094] The cross-sectional dimensions of both the input cover 11 and the output cover 12 are larger than the cross-sectional dimensions of the bundled tube 13; mesh plates 22 for the bundled tube to pass through are installed at both ends inside the bundled tube 13, such as... Figure 6 As shown.

[0095] The tubes or cables pass through the mesh openings 14 on the mesh plate. Each tube or cable passes through one mesh opening.

[0096] The clustered tunnel protection unit 10 can ensure that the tunnel wall 15 does not leak air, and also protect and organize the bundled tubes 16 so that they are not flattened during glue application or fixing, thus preventing them from being undetectable, and also preventing multiple hoses from squeezing each other together.

[0097] The temperature, humidity and pressure sensing unit includes a temperature, humidity and pressure sensor 17 and a temperature, humidity and pressure transmitter 18; wherein, there is one or more sets of temperature, humidity and pressure sensors 17, and the temperature, humidity and pressure sensors are arranged on the temperature, humidity and pressure measurement points reserved in the mine ventilation shaft.

[0098] In this embodiment, there are, for example, five groups of temperature, humidity and pressure sensors 17, and each group of temperature, humidity and pressure sensors 17 can be arranged on a measurement point of the measuring bracket 2. There are no special installation requirements, as long as they are separated.

[0099] Among them, the temperature, humidity and pressure transmitter 18 is located outside the mine ventilation shaft, and the number of temperature, humidity and pressure sensors 17 corresponds one-to-one with the number of temperature, humidity and pressure transmitters 18, and the two are connected by cables; each temperature, humidity and pressure transmitter 18 is connected to the host computer.

[0100] Since the temperature, humidity and pressure sensor 17 is also located inside the air duct, the signal line led out from the temperature, humidity and pressure sensor 17 also needs to pass through the bundled air duct protection unit 10 to exit the air duct and then connect to the temperature, humidity and pressure transmitter 18.

[0101] To facilitate the management of dynamic pressure transmitter 19, temperature and humidity pressure transmitter 18, etc., the mine ventilation shaft carbon emission gas measurement device in this embodiment also includes a distributed data transmission unit 20, such as... Figure 7 As shown.

[0102] The dynamic pressure transmitter 19 and the temperature, humidity and pressure transmitter 18 are both located in the distributed data transmission unit 20.

[0103] The function of the distributed data transmission unit 20 is to connect with the bundle tube that passes through the bundle tunnel protection unit 10. Its main function is to transmit the information measured by the Pitot tube as dynamic pressure and to collect data such as temperature, humidity and pressure.

[0104] like Figure 7 As shown, the distributed data transmitter unit 20 is generally arranged in six layers, but the layout can be changed according to the number of transmitters. The top five layers correspond to 25 dynamic pressure transmitters 19, with five dynamic pressure transmitters 19 forming one layer.

[0105] The last layer consists of temperature, humidity and pressure transmitters 18, of which there are, for example, five, corresponding to temperature, humidity and pressure sensors 17.

[0106] The distributed data transmitter unit 20 is equipped with a bundled junction box 21. The dynamic pressure measurement bundle tubes and cables led out from the bundled tunnel protection unit 10 are connected to this box and then distributed to each dynamic pressure transmitter 19 and temperature and humidity pressure transmitter 18.

[0107] The dynamic pressure transmitter 19 is used to calculate the dynamic pressure. Each dynamic pressure transmitter 19 corresponds to a dynamic pressure sensor 1 at a fixed position, and the number of sensors is the same as the number of dynamic pressure measurement points. Generally, 25 points are used to measure the dynamic pressure in the wind tunnel during measurement.

[0108] Of course, an optimized layout can also be used to reduce the number of sensors and achieve the best measurement results at a low cost.

[0109] Each dynamic pressure transmitter 19 is controlled by a host computer and uses synchronous timing control technology to ensure that all points are collected synchronously.

[0110] The temperature, humidity and pressure transmitter 18 is used to transmit the temperature, humidity and pressure sensor data from the wind tunnel to the host computer. Figure 7 Mark 16 is a bundle tube connected to each dynamic pressure transmitter 1, 23 is a temperature, humidity and pressure signal line used for data transmission, and 24 is the housing of the distributed data transmission unit.

[0111] To prevent pressure data loss caused by long-distance bundled tube transmission, in this embodiment, the distributed data transmission unit 20 is generally arranged nearby on the outer side or upper part of the wind tunnel, such as... Figure 2 This is an installation method on the upper part of the ventilation shaft.

[0112] The gas concentration sensing unit includes three types: methane, carbon monoxide, and carbon dioxide gas concentration sensing units. Each type of gas concentration sensing unit is used to measure the concentration of one of the three gases: methane, carbon monoxide, and carbon dioxide.

[0113] All three gas concentration sensing units have the same structure. Taking the carbon monoxide gas concentration sensing unit as an example, ... Figure 8 As shown, it consists of a gas extraction sensing unit and a carbon monoxide gas concentration sensor.

[0114] The gas extraction sensing unit includes a bundle tube, an extraction pump, a filtration unit, and a cold drying and dehydration unit.

[0115] One end of the bundle tube in the gas extraction sensing unit is arranged at the gas concentration measurement point reserved in the mine ventilation shaft; the extraction pump, filter unit, cold drying and dehydration unit and gas concentration sensor are all located outside the mine ventilation shaft.

[0116] The bundle tube in the gas extraction sensing unit is led out from the mine ventilation shaft and connected in sequence to the filter unit, extraction pump, cold drying and dewatering unit, and carbon monoxide gas concentration sensor; among them, the carbon monoxide gas concentration sensor is connected to the host computer.

[0117] The number of gas extraction sensing units is related to the measurement points and can also be set according to the required measurement accuracy. To obtain the best accurate measurement effect, the same number of bundle tubes as the dynamic pressure sensor 1 can be arranged.

[0118] Each bundle tube and each dynamic pressure sensor 1 are installed in the same position. They are all drawn by the gas extraction unit. After extraction, they enter the filtration unit for dust removal, then pass through the cold drying water removal unit for water removal, and finally are sent to the gas concentration sensor to collect the gas concentration.

[0119] Of course, a single measurement point can be used in a single ventilation shaft to extract gas for gas concentration sensing. The gas concentration sensing unit's bundled tube passes through the bundled shaft protection unit 10 to release air, as long as it is not on the ventilation shaft wall.

[0120] The structure of the methane and carbon dioxide gas concentration sensing unit is the same as that of the carbon monoxide gas concentration sensing unit mentioned above. The difference is that they use methane and carbon dioxide gas concentration sensors, respectively, which will not be described in detail here.

[0121] After obtaining the concentrations of various gases (methane, carbon monoxide, carbon dioxide), multiplying them by the total flow rate of the ventilation shaft yields the precise concentration of each emitted gas. This method facilitates accurate measurement of carbon gas emissions from coal mines.

[0122] Compared with traditional methods that are not accurate in monitoring actual near-site coal mine carbon emissions, this invention achieves the goal of accurately measuring coal mine carbon gas emissions by precisely monitoring the gas discharged from the main ventilation shaft of the coal mine.

[0123] Of course, the above description is only a preferred embodiment of the present utility model. The present utility model is not limited to the above-described embodiments. It should be noted that any equivalent substitutions or obvious modifications made by those skilled in the art under the guidance of this specification fall within the scope of this specification and should be protected by the present utility model.

Claims

1. A device for measuring carbon emissions from a mine ventilation shaft, characterized in that, It includes a host computer and sensing units; among which, the sensing units include a wind speed sensing unit, a gas concentration sensing unit, and a temperature, humidity, and pressure sensing unit. The wind speed sensing unit, gas concentration sensing unit, and temperature, humidity and pressure sensing unit are all connected to the host computer. Each sensing unit's acquisition terminal is located inside the mine ventilation shaft, and is used to detect the emission wind speed, gas concentration, and temperature, humidity, and pressure information inside the mine ventilation shaft, and upload the collected information to the host computer.

2. The mine ventilation shaft carbon emission gas measuring device according to claim 1, characterized in that, The mine ventilation shaft carbon emission gas measuring device also includes a cluster penetration protection unit; wherein, the cluster penetration protection unit is installed on the ventilation shaft wall, with one end connected to the outside of the ventilation shaft and the other end connected to the inside of the ventilation shaft; The bundle tubes or cables leading from the acquisition ends of each sensing unit pass through the mine ventilation shaft via the bundled tunnel protection unit.

3. The mine ventilation shaft carbon emission gas measuring device according to claim 2, characterized in that, The cluster penetration protection unit includes an input cover, an output cover, and a cluster penetration pipe; wherein the input cover and the output cover are respectively connected to one end of the cluster penetration pipe and are located inside and outside the wind tunnel, respectively, and the cluster penetration pipe penetrates through the wind tunnel wall; The cross-sectional dimensions of the input and output covers are both larger than those of the bundled tube; mesh plates for the bundled tube to pass through are installed at both ends inside the bundled tube, through which the bundled tube or cable passes out through the holes in the mesh plates.

4. The mine ventilation shaft carbon emission gas measuring device according to claim 1, characterized in that, The mine ventilation shaft carbon emission gas measuring device also includes a measuring bracket; wherein the measuring bracket is vertically installed at a certain cross-section of the ventilation shaft, and the acquisition end of each sensing unit is installed on the measuring bracket.

5. The mine ventilation shaft carbon emission gas measuring device according to claim 4, characterized in that, The measuring support is a mesh structure formed by the cross connection of several horizontal and vertical mounting rods. The size of the mesh structure is adapted to the size of the cross section of the wind tunnel, and the edges of the mesh structure are fixed to the wall of the wind tunnel.

6. The mine ventilation shaft carbon emission gas measuring device according to claim 5, characterized in that, The grid area formed by the intersection of horizontal and vertical mounting rods is the wind speed sensing area. The wind speed sensing unit consists of multiple sets, and the acquisition end of each wind speed sensing unit is installed in a corresponding grid area, with its acquisition end extending to the center of the corresponding grid area to measure the wind speed within that grid area.

7. The mine ventilation shaft carbon emission gas measuring device according to claim 1, characterized in that, The wind speed sensing unit includes a dynamic pressure sensor and a dynamic pressure transmitter; there are multiple sets of dynamic pressure sensors, and each set of dynamic pressure sensors is arranged at a dynamic pressure measurement point reserved in the mine ventilation shaft. The number of dynamic pressure sensors and dynamic pressure transmitters are equal and they are connected in a one-to-one correspondence; Each of the aforementioned dynamic pressure transmitters is located outside the mine ventilation shaft, and each of the aforementioned dynamic pressure transmitters is connected to a host computer.

8. The mine ventilation shaft carbon emission gas measuring device according to claim 7, characterized in that, Each set of dynamic pressure sensors includes two pitot tubes, both of which are installed back-to-back facing downwards, with the sampling ports of the pitot tubes facing downwards. The sampling port of one pitot tube is arranged facing the wind, and the sampling port of the other pitot tube is arranged facing away from the wind. The two pitot tubes are each connected to a data acquisition port of the dynamic pressure transmitter via an independent bundle tube.

9. The mine ventilation shaft carbon emission gas measuring device according to claim 1, characterized in that, The temperature, humidity and pressure sensing unit includes a temperature, humidity and pressure sensor and a temperature, humidity and pressure transmitter; wherein, there is one or more sets of temperature, humidity and pressure sensors, and the temperature, humidity and pressure sensors are arranged on the temperature, humidity and pressure measurement points reserved in the mine ventilation shaft. The temperature, humidity and pressure transmitters are located outside the mine ventilation shaft, and the number of temperature, humidity and pressure sensors corresponds one-to-one with the number of temperature, humidity and pressure transmitters, and the two are connected by cables; each of the temperature, humidity and pressure transmitters is connected to a host computer.

10. The mine ventilation shaft carbon emission gas measuring device according to claim 9, characterized in that, The gas concentration sensing unit includes methane, carbon monoxide, and carbon dioxide gas concentration sensing units; each of the three gas concentration sensing units consists of a separate gas extraction sensing unit and a corresponding gas concentration sensor. The gas extraction sensing unit includes a bundle tube, an extraction pump, a filtration unit, and a cold drying and dehydration unit; One end of the bundle tube in the gas extraction sensing unit is arranged at the gas concentration measurement point reserved in the mine ventilation shaft; the extraction pump, filter unit, cold drying and dehydration unit and gas concentration sensor are all located outside the mine ventilation shaft; The bundle tube in the gas extraction sensing unit is led out from the mine ventilation shaft and connected in sequence to the filtration unit, extraction pump, cold drying and dewatering unit, and the corresponding gas concentration sensor; each gas concentration sensor is connected to the host computer.

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