CN114382545A - Long-term real-time monitoring method and device for ventilation resistance of coal mine tunnel - Google Patents
Long-term real-time monitoring method and device for ventilation resistance of coal mine tunnel Download PDFInfo
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- CN114382545A CN114382545A CN202210047905.9A CN202210047905A CN114382545A CN 114382545 A CN114382545 A CN 114382545A CN 202210047905 A CN202210047905 A CN 202210047905A CN 114382545 A CN114382545 A CN 114382545A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21F1/08—Ventilation arrangements in connection with air ducts, e.g. arrangements for mounting ventilators
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- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
Abstract
The invention discloses a long-term real-time monitoring method and a long-term real-time monitoring device for ventilation resistance of a coal mine tunnel, wherein monitoring points are determined, one tunnel with the same tunnel section specification is selected as a monitoring object, and positions of a measuring point I and a measuring point II in the tunnel are determined; installing a differential pressure sensor, a pitot tube and a rubber tube, respectively installing a pitot tube at a measuring point I and a measuring point II in a roadway, fixing the differential pressure sensor in a range of 10m before and after the measuring point I, and connecting the pitot tubes of the measuring point I and the measuring point II through the rubber tube; and reading and uploading monitoring data in real time, sensing pressure difference by a differential pressure sensor through a pitot tube and a rubber tube, wherein the pressure difference comprises static pressure difference and potential energy difference, the pressure difference is ventilation resistance between a roadway measuring point I and a roadway measuring point II, and the differential pressure sensor displays the monitoring result in a digital mode underground and uploads the monitoring result to an upper computer. The method has the advantages of solving the problem that the pitot tube is blocked after being continuously used for a long time and realizing long-term real-time monitoring of the ventilation resistance of the roadway.
Description
Technical Field
The invention relates to the technical field of roadway ventilation resistance monitoring, in particular to a method and a device for monitoring the ventilation resistance of a coal mine roadway in real time for a long time.
Background
The method for measuring the ventilation resistance of the mine is divided into a differential pressure method and an air pressure method, wherein the air pressure method is divided into a base point method and a synchronous method. In any method, a professional is required to go to the underground coal mine to measure the roadway on site, the measurement workload is huge, the time spent is long, and the efficiency is low. In addition, as the coal mine safety regulation stipulates that the mine ventilation resistance measurement must be carried out at least once every three years in China, the actual measurement work is generally borne by a unit with related detection and inspection qualification, and the coal mine saves the cost and only carries out the mine ventilation resistance measurement once in a three-year period. Along with the continuous progress of the mine excavation activity, the mine ventilation network also changes continuously, namely the roadway ventilation resistance changes continuously, so that the actual change condition of the acquired roadway ventilation resistance data in the measuring period is delayed greatly.
Meanwhile, with the rapid advance of intelligent coal mine construction sites, regulations such as intelligent coal mine construction guidelines (2021 edition) and intelligent coal mine acceptance methods (trial implementation) are in succession, and accurate, automatic and real-time monitoring of tunnel ventilation resistance is required. The intelligent ventilation system is used for realizing daily air supply according to needs and emergency air control in an abnormal catastrophe state, the wind resistance of a roadway is one of key parameters which must be used as a basis, the wind resistance is calculated by the ventilation resistance of the roadway and the wind quantity of the roadway, the wind quantity of the roadway can be obtained in real time according to the monitoring data of a wind speed sensor at present, and the ventilation resistance of the coal mine roadway is single in long-term real-time monitoring means and cannot be monitored for a long time at present.
The tunnel ventilation resistance refers to wind current energy loss caused by wind current retardation due to viscosity and inertia of wind current, wall surfaces of a roadway and the like when the wind current flows from a tunnel inner measuring point I to a tunnel inner measuring point II. And the ventilation resistance between the roadway measuring point I and the roadway measuring point II is the sum of the static pressure difference, the potential energy difference and the dynamic pressure difference of the two points. In order to monitor the sum of the static pressure difference, the dynamic pressure difference and the potential energy difference, most of the monitoring is completed through a differential pressure sensor, a pitot tube and a rubber tube. The pitot tube can sense static pressure and dynamic pressure, and the rubber tube can form position pressure and is connected to a differential pressure sensor, so that the pressure difference between two points can be measured. The ventilation resistance of the tunnel can be obtained by randomly selecting a section of tunnel and utilizing a differential pressure sensor, a pitot tube and a rubber tube. However, through field practice feedback, the method is only suitable for short-term monitoring and cannot be used for long-term monitoring, because the full-pressure inlet of the pitot tube is frequently blocked. In order to sense and transmit dynamic pressure, the pitot tube full-pressure inlet has to be opposite to the air flow, but the underground air is wet and is mixed with coal dust, and the pitot tube full-pressure inlet is easily blocked over time and finally cannot sense and transmit the dynamic pressure and the static pressure normally. Therefore, it is imperative to develop a method and a device for monitoring the ventilation resistance of the coal mine tunnel in real time for a long time and reliably.
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 method and a device for monitoring the ventilation resistance of a coal mine tunnel in real time for a long time, which have the advantages of solving the problem that a pitot tube is blocked after being continuously used for a long time and realizing the long-term real-time monitoring of the ventilation resistance of the tunnel.
The method for monitoring the ventilation resistance of the coal mine tunnel in real time for a long time according to the embodiment of the invention comprises the following steps:
step 1, determining monitoring points; the method comprises the following specific steps:
1.1, selecting a roadway with the same roadway section specification as a monitoring object;
step 1.2, determining positions of a roadway measuring point I and a roadway measuring point II;
step 2.1, mounting a pitot tube: respectively installing a pitot tube at a roadway internal measuring point I and a roadway internal measuring point II;
step 2.2, installing a differential pressure sensor;
step 2.3, connecting a pitot tube: connecting a pitot tube at a measuring point I in the roadway with a differential pressure sensor through a rubber tube, and connecting a pitot tube at a measuring point II in the roadway with the differential pressure sensor through the rubber tube;
3.1, a differential pressure sensor senses a pressure difference through a pitot tube and a rubber pipe, wherein the pressure difference comprises a static pressure difference and a potential energy difference, and the pressure difference is ventilation resistance between a roadway measuring point I and a roadway measuring point II;
and 3.2, digitally displaying the monitoring result underground by the differential pressure sensor and uploading the monitoring result to an upper computer.
The coal mine tunnel ventilation resistance long-term real-time monitoring device provided by the embodiment of the invention is used for monitoring the ventilation resistance between two points of a tunnel internal measuring point I and a tunnel internal measuring point II, and is characterized in that: the device comprises a differential pressure sensor, a pitot tube and a rubber tube, wherein the pitot tube is composed of an inner tube and an outer tube which are concentrically arranged, the outer tube is sleeved outside the inner tube, the differential pressure sensor is provided with a high-pressure inlet and a low-pressure inlet, the front end of a central hole of the inner tube is a full-pressure inlet parallel to the air flow direction, the rear end of the central hole of the inner tube is provided with a full-pressure joint perpendicular to the air flow direction, the full-pressure inlet is communicated with the full-pressure joint, the front end of the side wall of the outer tube is provided with a static-pressure inlet perpendicular to the air flow direction, the rear end of the side wall of the outer tube is provided with a static-pressure joint parallel to the air flow direction, the static-pressure inlet is communicated with the static-pressure joint, the full-pressure joint of the pitot tube at a roadway measuring point I is connected with the high-pressure inlet in the differential pressure sensor through the rubber tube, and the full-pressure joint of the pitot tube at a roadway measuring point II is connected with the low-pressure inlet in the differential pressure sensor through the rubber tube, the full pressure inlet is parallel to the direction of the wind flow and in the same direction as the wind flow, and the pitot tube only senses and transmits the static pressure of the air.
The method has the advantages that the problem that the ventilation resistance can only be monitored in a short term and cannot be monitored in a long term is solved on the basis of realizing the long-term real-time monitoring of the ventilation resistance of the coal mine tunnel, the idea of eliminating the dynamic pressure difference is provided by deeply analyzing a ventilation resistance calculation formula, the dynamic pressure difference is offset by utilizing the measuring point arrangement and the pitot tube installation connection mode, the problem that the pitot tube is blocked after being continuously used for a long time is avoided, and the long-term real-time monitoring of the ventilation resistance of the tunnel is realized.
Further specifically, in the above technical scheme, in the step 1.2, a distance between the roadway inside measuring point I and the roadway inside measuring point ii is 100-200 m.
Further specifically, in the above technical solution, in step 1.2, the roadway inside measuring point I is located in the upwind direction of the wind flow, and the roadway inside measuring point ii is located in the downwind direction of the wind flow.
More specifically, in the above technical solution, in the step 2.1, the differential pressure sensor is installed in a range of 10m from the front to the rear of the roadway measuring point I.
Further specifically, in the above technical solution, in step 2.2, the distance from the pitot tube at the point I in the roadway to the roadway bottom plate is the same as the distance from the pitot tube at the point ii in the roadway to the roadway bottom plate.
Further specifically, in the above technical solution, in the step 3.1, the ventilation resistance of the whole roadway is converted and calculated according to the length ratio by using the ventilation resistance between the roadway inside measuring point I and the roadway inside measuring point ii.
Further specifically, in the above technical solution, the air in the rubber tube is used for forming a level pressure and transmitting the level pressure to the differential pressure sensor, and the pressure sensed by the differential pressure sensor is the sum of the static pressure difference and the level pressure difference.
Further specifically, in the technical scheme, the mounting and connecting mode of the pitot tube at the roadway measuring point I is consistent with that of the pitot tube at the roadway measuring point II.
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 first schematic view of a monitoring arrangement of the present invention;
FIG. 2 is a second schematic illustration of the monitoring arrangement of the present invention;
fig. 3 is a third schematic view of the monitoring arrangement of the present invention.
The reference numbers in the drawings are: 1. a full pressure inlet; 2. a static pressure inlet; 3. a static pressure joint; 4. a full pressure joint; 5. a differential pressure sensor; 6. a high pressure inlet; 7. a low pressure inlet; 8. a pitot tube; 9. a rubber tube.
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.
The ventilation resistance between the roadway measuring point I and the roadway measuring point II is the sum of the static pressure difference, the potential energy difference and the dynamic pressure difference of the two points, and the calculation formula is as follows:
wherein h isRRepresenting the ventilation resistance between two points; p1Representing static pressure at a measuring point I in the roadway; p2Representing the static pressure at a measuring point II in the roadway; p1-P2Representing the static pressure difference between two points; g represents the gravitational acceleration; rhomRepresents the average density of air; z1The elevation at the measuring point I is represented; z2The elevation of the measuring point II is represented; g rhom(Z1-Z2) Representing the potential energy difference of two points;
representing the dynamic pressure difference of two points; rho1Representing the air density at a measuring point I in the roadway; rho2Representing the air density at a measuring point II in the roadway; v. of1Representing the wind speed at point I; v. of2Representing the wind speed at point ii.
The main reason for the blockage of the full-pressure inlet 1 is that the full-pressure inlet 1 is opposite to the wind flow, and in order to prevent the blockage of the full-pressure inlet 1, an effective and feasible method is to enable the full-pressure inlet 1 to follow the wind flow direction, so that the situation that the full-pressure inlet 1 is opposite to the wind flow is avoided, but the dynamic pressure difference cannot be monitored. If the dynamic pressure difference can be counteracted by an effective method, the ventilation resistance can be accurately monitored, and the monitoring can be carried out for a long time, thereby achieving two purposes.
Firstly, analyzing the air density rho at a measuring point I in a roadway1And air density rho at a measuring point II in the roadway2The calculation formula of the air density is as follows:
where ρ represents the air density in kg/m3；P0Representing the absolute static pressure of the wind flow of the measuring point, and the unit is Pa; phi denotes the relative humidity of the air in%; t represents the air temperature in units of; pwRepresents the saturated partial pressure of water vapor in Pa.
For a 200m roadway, the relative air humidity phi, the air temperature t and the saturated water vapor partial pressure PwVery little phase difference, only measureAbsolute static pressure P of point wind flow0There will be a gap, but the whole equation is multiplied by 10-5And therefore the air density ρ has very little influence on the dynamic pressure difference.
Secondly, analyzing the speed v of the wind flow of the tunnel, and converting the dynamic pressure difference into the wind speed difference of two measuring points when the air densities rho are approximately the same
Therefore, the wind speeds of the two measuring points are ensured to be similar. The calculation formula of the speed v of the tunnel wind flow is as follows:
v＝Q/S (3)
wherein v represents the speed of the roadway wind flow; q represents the air volume in the roadway; and S represents the sectional area of the roadway.
For an independent tunnel, namely no air flow in and out of the middle part of the independent tunnel, the volume of air flowing into the tunnel is equal to the volume of air flowing out of the tunnel, namely the air quantity Q in the tunnel is a fixed value, and when the section area S of the tunnel is unchanged, the speed v of the air flow in the tunnel cannot fluctuate greatly. Therefore, the wind speeds of the two measuring points are close to each other, the section specifications of the section where the measuring points are located are the same, and a section of roadway is not selected at will.
Therefore, dynamic pressure difference can be counteracted through a method of arranging measuring points, and the ventilation resistance of the roadway can be measured in real time for a long time by using the differential pressure sensor 5, the pitot tube 8 and the rubber tube 9.
Referring to fig. 1, 2 and 3, the method for monitoring the ventilation resistance of the coal mine tunnel in real time for a long time comprises the following steps based on the principle of an inclined differential pressure meter:
step 1, determining monitoring points; the method comprises the following specific steps:
and 1.1, selecting a roadway with the same roadway section specification as a monitoring object. The roadway specification mainly comprises the section shape, the section area, the roadway support mode and the installed equipment. The cross section shape comprises a rectangle, a semicircular arch, a three-heart arch and the like. The cross-sectional area is the product of the clear width and the clear height of the roadway. The roadway support mode comprises anchor cable mesh belt spraying support, bricklaying support and the like. The installed equipment means whether large-scale equipment such as a belt conveyor exists or not.
And 1.2, determining positions of a roadway internal measuring point I and a roadway internal measuring point II. Most of underground coal mine roadways are in a long-term creep state, the change of the section of the roadway is small, so that the length of the roadway with the unchanged section specification can reach the length of kilometers, the roadway with the length of kilometers only needs to be monitored within a range of 100-200 m, and the ventilation resistance of the whole roadway is converted and calculated through the ventilation resistance measured within the range of 100-200 m. The length of the selected roadway of the main air inlet and return roadway and the air inlet and return roadway of the mining area is preferably 100m, and the length of the selected roadway of the coal face crossheading is preferably 200 m. The distance between the roadway inner measuring point I and the roadway inner measuring point II is 100-200 m. And the roadway measuring point I is positioned in the upwind direction of the wind flow, and the roadway measuring point II is positioned in the downwind direction of the wind flow.
step 2.1, mounting a pitot tube 8: respectively installing a pitot tube 8 at a roadway internal measuring point I and a roadway internal measuring point II; the distance between the pitot tube 8 at the roadway measuring point I and the roadway bottom plate is consistent with the distance between the pitot tube 8 at the roadway measuring point II and the roadway bottom plate.
Step 2.2, installing a differential pressure sensor 5; the differential pressure sensor 5 is preferably installed within a distance of 10m from the front and rear of the point I in the roadway.
Step 2.3, connecting a pitot tube 8: and connecting a pitot tube 8 at a measuring point I in the roadway with the differential pressure sensor 5 through a rubber tube 9, and connecting the pitot tube 8 at a measuring point II in the roadway with the differential pressure sensor 5 through the rubber tube 9.
3.1, sensing the pressure difference with the dynamic pressure difference eliminated by a differential pressure sensor 5 through a pitot tube 8 and a rubber tube 9, wherein the pressure difference comprises static pressure difference and potential energy difference, and the pressure difference is ventilation resistance between a roadway measuring point I and a roadway measuring point II; and because the section specifications of the roadways are the same, the ventilation resistance of the whole roadway is converted and calculated according to the length proportion by utilizing the ventilation resistance between the roadway measuring point I and the roadway measuring point II.
And 3.2, digitally displaying the monitoring result underground by the differential pressure sensor 5 and uploading the monitoring result to an upper computer, specifically, digitally displaying the monitoring result underground by the differential pressure sensor 5 for a front-line worker to check, and uploading the monitoring result to the upper computer.
Referring to fig. 1, 2 and 3, the coal mine tunnel ventilation resistance long-term real-time monitoring device is used for monitoring the ventilation resistance between two points of a tunnel measuring point I and a tunnel measuring point II, and comprises a differential pressure sensor 5, a pitot tube 8 and a rubber tube 9, wherein the differential pressure sensor 5 can sense the pressure of the two points and calculate the pressure difference between the two points, the pitot tube 8 can sense and transmit static pressure, and air in the rubber tube 9 is used for forming position pressure and transmitting the position pressure to the differential pressure sensor 5. The mounting and connecting mode of the pitot tube 8 at the roadway measuring point I is consistent with that of the pitot tube 8 at the roadway measuring point II. The pitot tube 8 is formed by sleeving two concentric circular tubes, specifically, the pitot tube 8 is formed by an inner tube and an outer tube which are concentrically arranged, the outer tube is sleeved outside the inner tube, a high-pressure inlet 6 and a low-pressure inlet 7 are arranged on the differential pressure sensor 5, the front end of a central hole of the inner tube is a full-pressure inlet 1 which is parallel to the air flow direction, the rear end of the central hole of the inner tube is provided with a full-pressure joint 4 which is perpendicular to the air flow direction, the full-pressure joint 4 points to a roadway bottom plate perpendicularly, the full-pressure inlet 1 is communicated with the full-pressure joint 4, and the pitot tube 8 only has the functions of sensing and transmitting pressure. The front end of the side wall of the outer pipe is provided with a static pressure inlet 2 perpendicular to the air flow direction, the rear end of the side wall of the outer pipe is provided with a static pressure joint 3 parallel to the air flow direction, the static pressure inlet 2 is communicated with the static pressure joint 3, and the pitot tube 8 can sense and transmit static pressure.
It should be noted that: the pitot tube 8 and the rubber tube 9 are capable of transmitting pressure, the differential pressure sensor 5 is capable of sensing such pressure and displaying the number digitally, specifically, the pitot tube 8 is capable of sensing and transmitting static pressure and dynamic pressure, and the rubber tube 9 is capable of transmitting the bit pressure.
Referring to fig. 1, when ventilation resistance is monitored, a full pressure inlet 1 is required to be opposite to wind flow, a static pressure inlet 2 is perpendicular to wind direction, specifically, the full pressure inlet 1 is parallel to the wind flow direction and opposite to the wind flow direction, a full pressure joint 4 of a pitot tube 8 at a measuring point I in a roadway is connected with a high pressure inlet 6 in a differential pressure sensor 5 through a rubber tube 9, the full pressure joint 4 of the pitot tube 8 at a measuring point ii in the roadway is connected with a low pressure inlet 7 in the differential pressure sensor 5 through the rubber tube 9, at the moment, the pitot tube 8 senses and transmits static pressure and dynamic pressure of air, bit pressure is formed in the rubber tube 9, the three jointly act on the differential pressure sensor 5, and data displayed by the differential pressure sensor 5 is the sum of the static pressure difference, the dynamic pressure difference and the bit pressure difference.
According to the connection mode, according to the previous field experience feedback, due to the fact that the relative humidity of underground air is high, the humid air can be mixed with a certain amount of coal dust, and in a long period, due to the fact that the full-pressure inlet 1 is over against air flow, the pitot tube 8 is prone to being blocked, and finally the pitot tube 8 cannot normally sense and transmit pressure.
Referring to fig. 2, in order to solve the above problems, the present invention uses a full pressure inlet 1 to measure static pressure, and the specific operations are as follows: the full pressure inlet 1 is still parallel to the wind direction, but not aligned with the wind direction, but along the wind direction, i.e. the full pressure inlet 1 is parallel to the wind flow direction and is aligned with the wind flow direction. The rubber tube 9 is connected with the full-pressure joint 4, so that the pressure sensed by the full-pressure inlet 1 is only static pressure, the entering of coal dust is reduced due to the fact that the full-pressure inlet 1 is not aligned to the wind direction, the blockage is avoided, the problem that the pitot tube 8 fails due to dust blockage is solved, the pressure sensed by the differential pressure sensor 5 is the sum of the static pressure difference and the bit pressure difference, specifically, the pressure sensed by the differential pressure sensor 5 is only static pressure, and the pressure sensed by the differential pressure sensor 5 is only bit pressure, which is transmitted by the rubber tube 9.
The real-time monitoring of the ventilation resistance of the roadway is completed by the differential pressure sensor 5, the pitot tube 8 and the rubber tube 9, and particularly, the monitored ventilation resistance is aimed at the roadway with the same specification, and if the ventilation resistance of the whole mine is measured, a measuring point on a key ventilation route is determined, and then the method is used as a template for applying.
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 (9)
1. A long-term real-time monitoring method for ventilation resistance of a coal mine tunnel is characterized by comprising the following steps:
step 1, determining monitoring points; the method comprises the following specific steps:
1.1, selecting a roadway with the same roadway section specification as a monitoring object;
step 1.2, determining positions of a roadway measuring point I and a roadway measuring point II;
step 2, mounting a pitot tube (8), a differential pressure sensor (5) and a rubber tube (9); the method comprises the following specific steps:
step 2.1, mounting a pitot tube (8): respectively installing a pitot tube (8) at a roadway internal measuring point I and a roadway internal measuring point II;
step 2.2, installing a differential pressure sensor (5);
step 2.3, connecting a pitot tube (8): connecting a pitot tube (8) at a measuring point I in the roadway with a differential pressure sensor (5) through a rubber tube (9), and connecting a pitot tube (8) at a measuring point II in the roadway with the differential pressure sensor (5) through the rubber tube (9);
step 3, reading and uploading monitoring data in real time; the method comprises the following specific steps:
3.1, a differential pressure sensor (5) senses a pressure difference through a pitot tube (8) and a rubber tube (9), wherein the pressure difference comprises a static pressure difference and a potential energy difference, and the pressure difference is ventilation resistance between a roadway measuring point I and a roadway measuring point II;
and 3.2, digitally displaying the monitoring result underground by the differential pressure sensor (5) and uploading the monitoring result to an upper computer.
2. The coal mine roadway ventilation resistance long-term real-time monitoring method of claim 1, characterized by: in the step 1.2, the distance between the roadway internal measuring point I and the roadway internal measuring point II is 100-200 m.
3. The coal mine roadway ventilation resistance long-term real-time monitoring method of claim 1, characterized by: in the step 1.2, the roadway measuring point I is located in the upwind direction of the wind flow, and the roadway measuring point II is located in the downwind direction of the wind flow.
4. The coal mine roadway ventilation resistance long-term real-time monitoring method of claim 1, characterized by: in the step 2.1, the differential pressure sensor (5) is arranged in a range which is 10m away from the front and the back of a roadway measuring point I.
5. The coal mine roadway ventilation resistance long-term real-time monitoring method of claim 1, characterized by: in the step 2.2, the distance between the pitot tube (8) at the roadway measuring point I and the roadway bottom plate is consistent with the distance between the pitot tube (8) at the roadway measuring point II and the roadway bottom plate.
6. The coal mine roadway ventilation resistance long-term real-time monitoring method of claim 1, characterized by: and in the step 3.1, converting and calculating the ventilation resistance of the whole roadway according to the length proportion by using the ventilation resistance between the roadway measuring point I and the roadway measuring point II.
7. A coal mine tunnel ventilation resistance long-term real-time monitoring device for realizing the coal mine tunnel ventilation resistance long-term real-time monitoring method as claimed in any one of claims 1-6, which is used for monitoring the ventilation resistance between two points of a tunnel internal measuring point I and a tunnel internal measuring point II, and is characterized in that: the device comprises a differential pressure sensor (5), a pitot tube (8) and a rubber tube (9), wherein the pitot tube (8) is composed of an inner tube and an outer tube which are concentrically arranged, the outer tube is sleeved outside the inner tube, a high-pressure inlet (6) and a low-pressure inlet (7) are arranged on the differential pressure sensor (5), the front end of a central hole of the inner tube is a full-pressure inlet (1) parallel to the air flow direction, the rear end of the central hole of the inner tube is provided with a full-pressure joint (4) perpendicular to the air flow direction, the full-pressure inlet (1) is communicated with the full-pressure joint (4), the front end of the side wall of the outer tube is provided with a static-pressure inlet (2) perpendicular to the air flow direction, the rear end of the side wall of the outer tube is provided with a static-pressure joint (3) parallel to the air flow direction, the static-pressure inlet (2) is communicated with the static-pressure joint (3), the full-pressure joint (4) of the pitot tube (8) at a measuring point I in a measuring point in the outer tube is connected with the high-pressure inlet (6) in the differential pressure sensor (5) through the rubber tube (9), and a full-pressure joint (4) of a pitot tube (8) at a measuring point II in the roadway is connected with a low-pressure inlet (7) in the differential pressure sensor (5) through a rubber tube (9), a full-pressure inlet (1) is parallel to the air flow direction and is in the same direction with the air flow direction, and the pitot tube (8) only senses and transmits air static pressure.
8. The coal mine roadway ventilation resistance long-term real-time monitoring device of claim 7, wherein: the air in the rubber tube (9) is used for forming a level pressure and transmitting the level pressure to the differential pressure sensor (5), and the pressure sensed by the differential pressure sensor (5) is the sum of the static pressure difference and the level pressure difference.
9. The coal mine roadway ventilation resistance long-term real-time monitoring device of claim 7, wherein: the mounting and connecting mode of the pitot tube (8) at the roadway measuring point I is consistent with that of the pitot tube (8) at the roadway measuring point II.
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| CN202210047905.9A CN114382545A (en) | 2022-01-17 | 2022-01-17 | Long-term real-time monitoring method and device for ventilation resistance of coal mine tunnel |
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| CN202210047905.9A CN114382545A (en) | 2022-01-17 | 2022-01-17 | Long-term real-time monitoring method and device for ventilation resistance of coal mine tunnel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115045713A (en) * | 2022-07-26 | 2022-09-13 | 淮南矿业(集团)有限责任公司 | Mine ventilation resistance monitoring system and monitoring method |
| CN117516785A (en) * | 2024-01-04 | 2024-02-06 | 中国矿业大学 | Device and method for testing gas explosion and dynamic pressure in limited space |
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2022
- 2022-01-17 CN CN202210047905.9A patent/CN114382545A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115045713A (en) * | 2022-07-26 | 2022-09-13 | 淮南矿业(集团)有限责任公司 | Mine ventilation resistance monitoring system and monitoring method |
| CN117516785A (en) * | 2024-01-04 | 2024-02-06 | 中国矿业大学 | Device and method for testing gas explosion and dynamic pressure in limited space |
| CN117516785B (en) * | 2024-01-04 | 2024-03-19 | 中国矿业大学 | Device and method for testing gas explosion and dynamic pressure in limited space |
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