CN114382546A - Tunnel air volume measuring method - Google Patents

Tunnel air volume measuring method Download PDF

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Publication number
CN114382546A
CN114382546A CN202210047923.7A CN202210047923A CN114382546A CN 114382546 A CN114382546 A CN 114382546A CN 202210047923 A CN202210047923 A CN 202210047923A CN 114382546 A CN114382546 A CN 114382546A
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China
Prior art keywords
roadway
sulfur hexafluoride
measuring
air volume
point
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CN202210047923.7A
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Inventor
武福生
何敏
昌伟锋
卜滕滕
钱会发
王栋平
郝东波
李益鸣
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Tiandi Changzhou Automation Co Ltd
Changzhou Research Institute of China Coal Technology and Engineering Group Corp
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Tiandi Changzhou Automation Co Ltd
Changzhou Research Institute of China Coal Technology and Engineering Group Corp
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Priority to CN202210047923.7A priority Critical patent/CN114382546A/en
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
    • E21F17/18—Special adaptations of signalling or alarm devices
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
  • Sampling And Sample Adjustment (AREA)

Abstract

The invention discloses a roadway air quantity measuring method.A sulfur hexafluoride quantitative control release device is arranged on the upstream side of a roadway to be measured so as to release sulfur hexafluoride gas at a fixed release quantity; arranging a sulfur hexafluoride concentration measuring device on the leeward side of the roadway to be measured, and measuring the concentration of sulfur hexafluoride at a plurality of measuring points in the roadway section; comparing sulfur hexafluoride concentration values at a plurality of measuring points in the cross section, and if the sulfur hexafluoride concentration values at the measuring points in the cross section are equal, indicating that the sulfur hexafluoride and the roadway air flow are uniformly mixed; if the sulfur hexafluoride concentration values at each measuring point in the fracture surface are unequal, continuously measuring the sulfur hexafluoride concentration value at each measuring point in the next fracture surface along the wind flow direction until the sulfur hexafluoride concentration values at each measuring point in a certain fracture surface are equal; and substituting the sulfur hexafluoride concentration values and the sulfur hexafluoride release amounts with the same concentration value at each measuring point in the measured section into a calculation formula of the trace gas air volume measuring method, and calculating the air volume of the observation tunnel. The method improves the air quantity measuring precision.

Description

Tunnel air volume measuring method
Technical Field
The invention relates to the technical field of mine ventilation, in particular to a roadway air volume measuring method.
Background
Mine ventilation is one of the important contents for coal mine safety production. In the ventilation process of a mine, the air volume of an underground roadway needs to be measured regularly. At present, mine air volume measuring methods mainly comprise two main types of sensor wind measurement and manual wind measurement, and the two wind measurement methods are used for obtaining air volume by multiplying measured wind speed by roadway section area.
The sensor for measuring wind has the advantages that real-time on-line monitoring can be realized, manpower and material resources are saved, but the instantaneous wind speed of the position of the sensor is obtained when the sensor measures wind, and the wind speed of each point on the section of the roadway is unevenly distributed and tends to decrease from the center to the periphery, so that the wind speed of the position of the sensor does not necessarily represent the average wind speed of the whole section of the roadway; according to the turbulence pulsation theory, for the tunnel wind flow, the instantaneous wind speed fluctuates around the average wind speed, and thus the instantaneous wind speed measured by the sensor is not necessarily the average wind speed. Therefore, the roadway air volume calculated based on the instantaneous air speed measured by the sensor is prone to error.
The traditional manual wind measuring method comprises a four-line method, a six-line method, an eight-line method and a fixed-point method, wherein the fixed-point method is rarely used for measuring the tunnel wind volume due to the difficulty in fixed-point. The eight-line method is accurate in wind measurement, but is not easy to operate due to the complex route and is rarely applied. The mine generally adopts four-line method and six-line method to measure wind. The problem of uneven wind speed and fluctuation change of wind speed in the section of the roadway is well considered in manual wind measurement, the obtained wind speed is integrated on a spatial scale and a time scale at the same time, but the problems of uneven wind meter moving speed, difficulty in keeping the moving route of the wind meter consistent and the like in manual operation are faced, and the obtained wind speed can have larger errors.
SF6The (sulfur hexafluoride) is a chemically stable gas, is harmless to human bodies in a detection concentration range, has very high detection precision, is easy to detect and is a commonly used tracer gas for mines. But currently SF6The tracer gas anemometry method is mainly used for measuring the air leakage rate of a mine, the measurement of the roadway air volume is only limited in the measuring principle and the theoretical calculation level, and no specific SF-based method is provided6A method for measuring the ventilation of a roadway by using tracer gas. Based on the above, an SF-based system is provided6A method for directly measuring the wind quantity of a roadway by using tracer gas.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art.
Therefore, the invention provides a roadway air volume measuring method based on SF6And (4) directly carrying out accurate determination on the tunnel air quantity by using the tracer gas.
The roadway air volume measuring method provided by the embodiment of the invention comprises the following steps: step 1, arranging a sulfur hexafluoride quantitative control release device on the upwind side of a roadway to be tested; arranging a sulfur hexafluoride concentration measuring device on the leeward side of the roadway to be measured; step 2, releasing sulfur hexafluoride gas by a fixed release amount through a sulfur hexafluoride quantitative control release device, namely quantitatively controlling the release of sulfur hexafluoride on the air side of the roadway; measuring the sulfur hexafluoride concentration at a plurality of measuring points in the roadway section by using a sulfur hexafluoride measuring device, and further obtaining the sulfur hexafluoride concentration values at the plurality of measuring points in the roadway section; step 3, comparing sulfur hexafluoride concentration values at a plurality of detection points in the roadway section, and judging whether the sulfur hexafluoride concentration values at the detection points are equal or not; if the concentration values of the sulfur hexafluoride at each measuring point in the cross section of the roadway are equal, indicating that the sulfur hexafluoride and the air flow of the roadway are uniformly mixed; if the sulfur hexafluoride concentration values at each measuring point in the roadway section are not equal, continuously measuring the sulfur hexafluoride concentration values at each measuring point in the next section along the wind flow direction until the sulfur hexafluoride concentration values at each measuring point in a certain section are found to be equal; and 4, substituting the sulfur hexafluoride concentration values and the sulfur hexafluoride release amounts with the same concentration value at each measuring point in the measured roadway section into a calculation formula of the trace gas air volume measuring method, and calculating the air volume of the observed roadway.
The method has the advantages that the air volume of the roadway is measured by adopting the sulfur hexafluoride tracer gas, measuring points are arranged on the central point, the left side, the right side, the top plate and the bottom plate of the roadway, whether concentration values of the sulfur hexafluoride at the measuring points are equal or not is detected, and if the concentration values are equal, the concentration values are substituted into a calculation formula of a tracer gas air volume measuring method for calculation; if the measured values are not equal, the section of the next measuring point is continuously measured along the air flow direction until the concentration of the sulfur hexafluoride at each measuring point in a certain section is measured to be equal, and then the air volume of the roadway is calculated.
Further specifically, in the technical scheme, the unit for the fixed release amount of the sulfur hexafluoride is unified with all units of mine air volume, and the unit is m3/min。
Further specifically, in the above technical solution, the tracer gas air volume measurement method has the following calculation formula:
Figure BDA0003472493970000021
wherein Q is1The unit of the mixed air volume is m, which represents the mixed air volume of the roadway after the air volume and the sulfur hexafluoride release amount are uniformly mixed3Min; q represents the amount of tracer gas released in m3Min; c represents that the released sulfur hexafluoride is evenly mixed with the original air quantity in the tunnel and then is hexafluoroatedThe concentration of sulfur;
Figure BDA0003472493970000022
wherein Q represents the air volume of the roadway and the unit is m3/min。
Further specifically, in the above technical solution, the roadway to be tested is a single roadway whose middle part is not connected to other roadways, that is, a roadway in which no air current flows in the middle part.
Further specifically, in the technical scheme, the arrangement number and the arrangement positions of the measuring points are determined according to different shapes of the cross sections of the roadway and installation conditions of equipment and facilities in the roadway, but not less than five measuring points are determined.
Further specifically, in the technical scheme, five detection points covering the section of the roadway are taken in the section of the roadway to detect the concentration of the sulfur hexafluoride, and the five detection points are respectively located at the central point of the roadway, the left side of the roadway, the right side of the roadway, the top plate of the roadway and the bottom plate of the roadway.
Further specifically, in the above technical solution, a detection point located at a center point of the roadway is set as a first detection point, a detection point located at a top plate of the roadway is set as a second detection point, a detection point located at a left side of the roadway is set as a third detection point, a detection point located at a bottom plate of the roadway is set as a fourth detection point, and a detection point located at a right side of the roadway is set as a fifth detection point; when the section of the roadway is a regular rectangle, the connecting central point of the second detection point and the fourth detection point is the first detection point, and the connecting central point of the third detection point and the fifth detection point is also the first detection point.
Further specifically, in the above technical solution, a quantitative flow meter is arranged at a release port of the sulfur hexafluoride quantitative control release device, and the quantitative flow meter is used for controlling the release amount of the sulfur hexafluoride.
Further specifically, in the above technical solution, the sulfur hexafluoride concentration measurement device includes a sulfur hexafluoride gas vent for introducing sulfur hexafluoride gas and a liquid crystal display screen for digitally displaying a concentration value of the sulfur hexafluoride gas.
Further specifically, in the above technical solution, the sulfur hexafluoride concentration measurement device further includes a key area, and the key area includes an up-turn key, a down-turn key, a power-on determination key, a return key, and a menu key.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a schematic diagram of wind measurement by using sulfur hexafluoride in a single roadway;
FIG. 3 is a schematic view of a quantitative controlled release device for sulfur hexafluoride according to the present invention;
FIG. 4 is a schematic diagram of the arrangement of sulfur hexafluoride concentration detection points in the observation tunnel section;
FIG. 5 is a schematic view of a sulfur hexafluoride concentration measuring apparatus according to the present invention.
The reference numbers in the drawings are: 1. a release point; 2. measuring points; 3. a quantitative flow meter; 4. a first detection point; 5. a second detection point; 6. a third detection point; 7. a fourth detection point; 8. a fifth detection point; 9. a sulfur hexafluoride vent; 10. a liquid crystal display screen; 11. an up-turning key; 12. a key is turned down; 13. a boot confirm key; 14. a return key; 15. a menu key.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 2, fig. 3, fig. 4 and fig. 5, the method for measuring roadway air volume of the present invention comprises the following steps:
step 1, as shown in figure 2, arranging a sulfur hexafluoride quantitative control release device on the windward side of a roadway to be tested; it should be noted that: the windward side of the roadway refers to a point through which the wind flow direction passes first, specifically, see release point 1 in fig. 2. The roadway to be tested is a single roadway with the middle part not connected with other roadways, namely the roadway without air flow afflux into the middle part. And arranging a sulfur hexafluoride concentration measuring device on the leeward side of the roadway to be measured, as shown in figure 5. It should be noted that: the leeward side of the roadway refers to a point past in the direction of the wind flow, and is specifically shown as a measurement point 2 in fig. 2.
Step 2, releasing sulfur hexafluoride gas by a fixed release amount through a sulfur hexafluoride quantitative control release device, namely quantitatively controlling the release of sulfur hexafluoride on the air side of the roadway; and a quantitative flowmeter is arranged at the release port of the sulfur hexafluoride quantitative control release device and is used for controlling the release amount of the sulfur hexafluoride. Referring to fig. 3, the sulfur hexafluoride quantitative control release device uses a sulfur hexafluoride storage tank which releases sulfur hexafluoride gas at a fixed rate through a quantitative flow meter 3. It should be noted that: the release amount of the sulfur hexafluoride is determined according to the air volume in the roadway, namely the larger the air volume in the roadway is, the larger the release amount of the sulfur hexafluoride needs to be; and conversely, the smaller the air flow in the roadway, the smaller the sulfur hexafluoride release amount.
Arranging enough comprehensive sulfur hexafluoride concentration detection points in the section of the roadway at the observation points, and measuring the concentrations of the sulfur hexafluoride at a plurality of detection points in the section of the roadway by using a sulfur hexafluoride measuring device, namely measuring the concentrations of the sulfur hexafluoride at each detection point by using the sulfur hexafluoride measuring device, so as to obtain the concentration values of the sulfur hexafluoride at the plurality of detection points in the section of the roadway. The sulfur hexafluoride concentration at a plurality of measuring points in the roadway section means that a roadway central point, two sides, a top plate, a bottom plate and the like are taken to cover a plurality of representative measuring points of the roadway section in the observation point section, and the sulfur hexafluoride concentration is detected. The arrangement and the position of the measuring points can be determined according to different shapes of the cross section of the roadway and installation conditions of equipment and facilities in the roadway, but the number of the measuring points is not less than five. When the five detection points are just taken, the five detection points covering the section of the roadway are taken in the section of the roadway to detect the concentration of the sulfur hexafluoride, and the five detection points are respectively located at the central point of the roadway, the left side of the roadway, the right side of the roadway, the top plate of the roadway and the bottom plate of the roadway.
Referring to fig. 4, setting a detection point at a center point of the roadway as a first detection point 4, setting a detection point at a top plate of the roadway as a second detection point 5, setting a detection point at a left side of the roadway as a third detection point 6, setting a detection point at a bottom plate of the roadway as a fourth detection point 7, and setting a detection point at a right side of the roadway as a fifth detection point 8; when the section of the roadway is a regular rectangle, the connecting center point of the second detection point 5 and the fourth detection point 7 is the first detection point 4, and the connecting center point of the third detection point 6 and the fifth detection point 8 is also the first detection point 4.
Step 3, comparing sulfur hexafluoride concentration values at a plurality of detection points in the roadway section, and judging whether the sulfur hexafluoride concentration values at the detection points are equal or not; if the concentration values of the sulfur hexafluoride at each measuring point in the cross section of the roadway are equal, indicating that the sulfur hexafluoride and the air flow of the roadway are uniformly mixed; if the sulfur hexafluoride concentration values at each measuring point in the roadway section are not equal, continuously measuring the sulfur hexafluoride concentration values at each measuring point in the next section along the wind flow direction until the sulfur hexafluoride concentration values at each measuring point in a certain section are found to be equal; it should be noted that: in consideration of the problem of measurement errors, the concentration values of the sulfur hexafluoride at each measuring point do not need to be strictly equal, and the error range of the concentration value of the sulfur hexafluoride at each measuring point is within 5%.
Step 4, substituting the sulfur hexafluoride concentration values and the sulfur hexafluoride release amounts with the same concentration value at each measuring point in the measured roadway section into a calculation formula of the trace gas air quantity measuring method, and calculating the air quantity of the observed roadway; the calculation formula of the tracer gas air volume measuring method is as follows:
Figure BDA0003472493970000051
wherein Q is1The unit of the mixed air volume is m, which represents the mixed air volume of the roadway after the air volume and the sulfur hexafluoride release amount are uniformly mixed3Min; q represents the amount of tracer gas released in m3Min; c represents the concentration of the released sulfur hexafluoride after being uniformly mixed with the original air volume in the roadway, and it should be noted that the concentration is not the concentration in the strict sense, but means the proportion of the sulfur hexafluoride in the mixed air flow after being uniformly mixed with the air flow in the roadway, namely the proportion of the sulfur hexafluoride in the uniformly mixed air flow;
Figure BDA0003472493970000052
wherein Q represents the air volume of the roadway and the unit is m3/min。
In the invention, the unit for fixing and releasing sulfur hexafluoride is unified with all units of mine air volume, and the unit is m3Min, not volume unit m in other scenarios3。
Referring to fig. 5, the sulfur hexafluoride concentration determination device includes a sulfur hexafluoride gas vent 9 for introducing sulfur hexafluoride gas, a liquid crystal display screen 10 for digitally displaying a concentration value of the sulfur hexafluoride gas, and a key area, where the key area includes an up-turn key 11, a down-turn key 12, a power-on determination key 13, a return key 14, and a menu key 15. It should be noted that although the sulfur hexafluoride concentration measuring device is used for measuring the concentration of sulfur hexafluoride gas in the present invention, it is not actually used only for measuring the concentration of sulfur hexafluoride gas, but actually it can also be used for measuring the concentration of other gases, so the start-up determining key 13 has the following specific functions: the method has the functions of starting up, and determining the type of gas to be measured; the menu key 15 is used for selecting the gas to be measured after the power is turned on; the up-turning key 11 and the down-turning key 12 are used for turning up and down when selecting the gas type; the return key 14 is for returning to the previous interface.
Measuring the tunnel air volume by adopting sulfur hexafluoride tracer gas, detecting whether the concentration values of the sulfur hexafluoride at each measuring point are equal by arranging measuring points on the center point, the left side, the right side, the top plate and the bottom plate of the tunnel, and substituting the concentration values into a tracer gas air volume measuring method calculation formula for calculation if the concentration values are equal; if the measured values are not equal, the section of the next measuring point is continuously measured along the air flow direction until the concentration of the sulfur hexafluoride at each measuring point in a certain section is measured to be equal, and then the air volume of the roadway is calculated.
It should be noted that: the method provided by the invention is not only limited to be suitable for measuring the air quantity in a roadway, but also similar to the air quantity measurement in the scenes of tunnels, pipelines and the like, and the method utilizing the wind measuring principle of the invention also belongs to the category of the wind measuring method of the invention.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention are equivalent to or changed within the technical scope of the present invention.

Claims (10)

1. A roadway air volume measuring method is characterized by comprising the following steps:
step 1, arranging a sulfur hexafluoride quantitative control release device on the upwind side of a roadway to be tested; arranging a sulfur hexafluoride concentration measuring device on the leeward side of the roadway to be measured;
step 2, releasing sulfur hexafluoride gas by a fixed release amount through a sulfur hexafluoride quantitative control release device, namely quantitatively controlling the release of sulfur hexafluoride on the air side of the roadway; measuring the sulfur hexafluoride concentration at a plurality of measuring points in the roadway section by using a sulfur hexafluoride measuring device, and further obtaining the sulfur hexafluoride concentration values at the plurality of measuring points in the roadway section;
step 3, comparing sulfur hexafluoride concentration values at a plurality of detection points in the roadway section, and judging whether the sulfur hexafluoride concentration values at the detection points are equal or not; if the concentration values of the sulfur hexafluoride at each measuring point in the cross section of the roadway are equal, indicating that the sulfur hexafluoride and the air flow of the roadway are uniformly mixed; if the sulfur hexafluoride concentration values at each measuring point in the roadway section are not equal, continuously measuring the sulfur hexafluoride concentration values at each measuring point in the next section along the wind flow direction until the sulfur hexafluoride concentration values at each measuring point in a certain section are found to be equal;
and 4, substituting the sulfur hexafluoride concentration values and the sulfur hexafluoride release amounts with the same concentration value at each measuring point in the measured roadway section into a calculation formula of the trace gas air volume measuring method, and calculating the air volume of the observed roadway.
2. The roadway air volume measuring method according to claim 1, characterized in that: the units for fixing and releasing the sulfur hexafluoride are unified with all units of mine air volume, and the units are m3/min。
3. The roadway air volume measuring method according to claim 1, characterized in that: the calculation formula of the tracer gas air volume measuring method is as follows:
Figure FDA0003472493960000011
wherein Q is1The unit of the mixed air volume is m, which represents the mixed air volume of the roadway after the air volume and the sulfur hexafluoride release amount are uniformly mixed3Min; q represents the amount of tracer gas released in m3Min; c represents the concentration of the released sulfur hexafluoride after being uniformly mixed with the original air volume in the roadway;
Figure FDA0003472493960000012
wherein Q represents the air volume of the roadway and the unit is m3/min。
4. The roadway air volume measuring method according to claim 1, characterized in that: the roadway to be tested is a single roadway with the middle part not connected with other roadways, namely the roadway without air current flowing into the middle part.
5. The roadway air volume measuring method according to claim 1, characterized in that: the arrangement and the position of the measuring points are determined according to different shapes of the cross sections of the roadway and installation conditions of equipment and facilities in the roadway, but not less than five measuring points.
6. The roadway air volume measuring method according to claim 5, characterized in that: and taking five detection points covering the section of the roadway to detect the concentration of the sulfur hexafluoride in the section of the roadway, wherein the five detection points are respectively positioned at the central point of the roadway, the left side of the roadway, the right side of the roadway, the top plate of the roadway and the bottom plate of the roadway.
7. The roadway air volume measuring method according to claim 6, characterized in that: setting a detection point at the center point of the roadway as a first detection point, setting a detection point at the top plate of the roadway as a second detection point, setting a detection point at the left side of the roadway as a third detection point, setting a detection point at the bottom plate of the roadway as a fourth detection point, and setting a detection point at the right side of the roadway as a fifth detection point; when the section of the roadway is a regular rectangle, the connecting central point of the second detection point and the fourth detection point is the first detection point, and the connecting central point of the third detection point and the fifth detection point is also the first detection point.
8. The roadway air volume measuring method according to claim 1, characterized in that: and a quantitative flowmeter is arranged at a release port of the sulfur hexafluoride quantitative control release device and is used for controlling the release amount of the sulfur hexafluoride.
9. The roadway air volume measuring method according to claim 1, characterized in that: the sulfur hexafluoride concentration measuring device comprises a sulfur hexafluoride air vent (9) for introducing sulfur hexafluoride gas and a liquid crystal display screen (10) for digitally displaying the concentration value of the sulfur hexafluoride gas.
10. The roadway air volume measuring method according to claim 9, characterized in that: the sulfur hexafluoride concentration measuring device further comprises a key area, wherein the key area comprises an up-turning key (11), a down-turning key (12), a startup confirming key (13), a return key (14) and a menu key (15).
CN202210047923.7A 2022-01-17 2022-01-17 Tunnel air volume measuring method Pending CN114382546A (en)

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