CN111595395A - Accurate tunnel air volume monitoring system and method - Google Patents
Accurate tunnel air volume monitoring system and method Download PDFInfo
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- CN111595395A CN111595395A CN202010381669.5A CN202010381669A CN111595395A CN 111595395 A CN111595395 A CN 111595395A CN 202010381669 A CN202010381669 A CN 202010381669A CN 111595395 A CN111595395 A CN 111595395A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/12—Cleaning arrangements; Filters
- G01F15/125—Filters
Abstract
The invention discloses a roadway air volume accurate monitoring system and a roadway air volume accurate monitoring method, wherein the roadway air volume accurate monitoring system comprises an air volume monitoring device and a monitoring pipeline, a differential pressure sensor is used for measuring differential pressure data between a detection pipe I and a detection pipe II in real time and feeding back the differential pressure data to an operation analysis module; the operation analysis module receives the differential pressure data for calculation processing, and displays the calculated real-time air volume through a display screen and simultaneously transmits the real-time air volume through the signal transmitting module; obtaining the pressure difference between a tunnel section I and a tunnel section II through a differential pressure sensor, inputting the measured initial parameters into an operation analysis module as constants, and then performing iterative operation through a ventilation resistance law and a Bernoulli equation to obtain the air volume of a tunnel section between the tunnel section I and the tunnel section II; the invention can realize real-time accurate monitoring of the air volume, and avoids the problem of inaccurate air measurement caused by difficulty in calculating the average air speed of the section due to irregular section of the tunnel because the real-time air speed of the tunnel is not required to be measured, thereby realizing continuous and direct monitoring of the ventilation volume of the tunnel.
Description
Technical Field
The invention relates to a roadway air volume accurate monitoring system and a roadway air volume accurate monitoring method, and belongs to the technical field of mine roadway air volume measurement.
Background
Along with the increase of the coal mining scale, a mine ventilation system is larger and more complex, the real-time air quantity in a coal mine tunnel is accurately measured, and the method has great significance for the management of a ventilation network system of a mine and the prevention and control work of disasters.
At present, there are many methods for measuring wind in mine tunnels, such as the following application numbers: 201910661706.5, the name is: the invention discloses a method for measuring and monitoring ventilation volume in a tunnel, which is a Chinese invention patent and aims to find out a point capable of representing average wind speed of a cross section by using laser radar assistance and then manually measure wind speed at the point so as to calculate tunnel wind volume. If the application number is as follows: 201811534391.X, entitled: a method for accurately measuring the air volume of large-section tunnel features that a grooved rail is installed to the cross-section of tunnel, and a wind meter moves on the grooved rail. In the second method, the wind meter moves on the groove rail and measures the wind speed at a time interval, so that the wind speeds at all points measured by the wind meter are not the section wind speeds at the same time, and the error is large. Therefore, the two methods cannot realize real-time accurate monitoring of the air volume.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a roadway air quantity accurate monitoring system and a roadway air quantity accurate monitoring method, which can realize real-time accurate monitoring of air quantity, and avoid the problem of inaccurate air quantity measurement caused by difficulty in calculating average air speed of a section due to irregular section of a roadway because real-time air speed in the roadway does not need to be measured, thereby realizing continuous and direct monitoring of the ventilation quantity of the roadway.
In order to achieve the purpose, the invention adopts the technical scheme that: an accurate monitoring system for tunnel air volume comprises an air volume monitoring device and a monitoring pipeline,
the air quantity monitoring device comprises a shell, a differential pressure sensor, an operational analysis module, a signal transmitting module and a display screen, wherein the shell is fixed on the side wall of a roadway, the differential pressure sensor, the operational analysis module and the signal transmitting module are fixed in the shell, the display screen is fixed on the surface of the shell, the shell is provided with a detection tube I and a detection tube II, one end of the detection tube I and one end of the detection tube II are respectively connected with two detection ends of the differential pressure sensor in the shell, a monitoring pipeline is fixed on the side wall of the roadway and horizontally arranged along the trend of the roadway, the other end of the detection tube I is connected with one end of the monitoring pipeline through a pipeline, and the other end of the monitoring pipeline is provided with; the other end of the detection pipe II is provided with a dust filter sleeve II for collecting the air pressure of the roadway section II; the dust filter sleeve I and the dust filter sleeve II are positioned on the same horizontal plane;
the differential pressure sensor is used for detecting differential pressure data between the detection pipe I and the detection pipe II in real time and feeding the differential pressure data back to the operation analysis module; the operation analysis module receives the differential pressure data for calculation processing, and displays the calculated real-time air volume through a display screen and simultaneously wirelessly transmits the real-time air volume through the signal transmitting module;
the dust filter sleeve I is composed of a hollow cylinder and a hollow sphere, one end of the hollow cylinder is connected with the hollow sphere, a plurality of through holes are formed in the surface of the hollow sphere, and the other end of the hollow cylinder is connected with the other end of the monitoring pipeline; the structure of the dust filter sleeve II is the same as that of the dust filter sleeve I.
The hanging hook is arranged outside the shell and used for hanging the shell on the side wall of the roadway.
Further, the operation analysis module is a single chip microcomputer.
Further, the length of the hollow cylinder is greater than 20mm, the diameter of the through hole is 1mm, and the length of the monitoring pipeline is not less than 50 m. By adopting the size, the accurate air pressure difference between the roadway section I and the roadway section II can be obtained through measurement.
A monitoring method of a roadway air quantity accurate monitoring system comprises the following specific steps:
A. the accurate monitoring system for the tunnel air volume is installed in a tunnel needing to measure the air volume, and then the area S1 of the tunnel section I, the area S2 of the tunnel section II and the elevation Z of the tunnel section I are obtained through measurement1And the elevation Z of the roadway section II2The gravity acceleration g of a tunnel section between the tunnel section I and the tunnel section II, the total wind resistance R of the tunnel section between the tunnel section I and the tunnel section II, and the gas density rho of the tunnel section between the tunnel section I and the tunnel section II are input into the operational analysis module by taking the measured values as constants;
B. when the tunnel air volume detection is started, gas at a tunnel section I is filtered by a dust filter sleeve I and then enters a monitoring pipeline, and is transmitted to a differential pressure sensor through a detection pipe I, meanwhile, gas at a tunnel section II is filtered by a dust filter sleeve II and then enters a detection pipe II and is transmitted to the differential pressure sensor, the differential pressure sensor detects the air pressure difference between the detection pipe I and the detection pipe II, and transmits air pressure difference data to an operational analysis module;
C. the operation analysis module combines the received air pressure difference data with a stored calculation formula to perform analysis processing, and the specific process is as follows:
according to the ventilation resistance law, the following results are obtained:
h＝RQ2(1)
in the formula: h is the ventilation resistance of the tunnel section between the tunnel section I and the tunnel section II; q is the air volume of the tunnel section between the tunnel section I and the tunnel section II;
from bernoulli's equation:
in the formula: h' is the energy loss of air in unit volume between the roadway section I and the roadway section II; v. of1The wind speed is the wind speed at the section I of the roadway; v. of2The wind speed at the section II of the roadway is obtained; p1The air pressure at the section I of the roadway is used; p2The air pressure at the section II of the roadway is used;
is a loss of kinetic energy; p1-P2The air pressure difference between the roadway section I and the roadway section II is obtained;
because the kinetic energy loss can not be directly measured, h' can not be directly obtained, the method adopts an iterative algorithm to obtain the following specific steps:
a. firstly, neglecting the kinetic energy loss in the formula (2), and then the formula (2) becomes the following formula (3);
h0’＝(P1-P2)+gρ(Z1-Z2) (3)
the air pressure difference measured by the differential pressure sensor is substituted into the formula (3), thereby obtaining h0The value of';
b. h is to be0The value of' is taken as the ventilation resistance h, and is substituted into the formula (1) to obtain a first air volume iteration value Q0Since S is known1And S2Can thus derive a first iterative value v of wind speed1And v2(ii) a And obtaining the wind speed iteration value
A value of (d);
c. h is to be0' value and
to obtain a first ventilation resistance iteration value h1'; then h is mixed1' as ventilation resistance h, and repeating steps b and c to obtain a second iterative ventilation resistance value h2’；
d. Circularly repeating the steps b and c until the nth ventilation resistance iteration value h is obtainedn' and the last value hn-1' when the difference between the values is less than 1Pa, the iterative operation is ended, and h is calculatednThe method is carried out by introducing formula (1) into the device, so that the air quantity Q of the roadway section between the roadway section I and the roadway section II is obtained, and finally the obtained air quantity Q is displayed through a display screen and wirelessly transmitted through a signal transmitting module.
Compared with the prior art, the method adopts a mode of combining the air quantity monitoring device and the monitoring pipeline, obtains the air pressure difference between the roadway section I and the roadway section II through the differential pressure sensor, measures the required initial parameters, inputs the measured initial parameters into the operation analysis module as constants, and then carries out iterative operation through the ventilation resistance law and the Bernoulli equation so as to obtain the air quantity Q of the roadway section between the roadway section I and the roadway section II; the invention can realize real-time accurate monitoring of the air volume, and avoids inaccurate air volume measurement caused by difficulty in calculating the average air velocity of the section due to irregular section of the tunnel because the real-time air velocity in the tunnel is not required to be measured, thereby realizing continuous and direct monitoring of the ventilation volume of the tunnel.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
fig. 2 is a schematic structural diagram of the dust filter sleeve I of the invention.
In the figure: 1. an air quantity monitoring device; 1-1, differential pressure sensor; 1-2, an operation analysis module; 1-3, a display screen; 1-4, a signal transmitting module; 1-5, hanging hooks; 1-6, a detection tube I; 1-7, a detection tube II; 2-1, a dust filter sleeve I; 2-2, a dust filter sleeve II; 3. monitoring the pipeline; 4. a roadway; 5. a roadway section I; 6. and (5) roadway section II.
Detailed Description
The present invention will be further explained below.
As shown in fig. 1 and fig. 2, an accurate monitoring system for tunnel air volume comprises an air volume monitoring device and a monitoring pipeline,
the air quantity monitoring device 1 comprises a shell, a differential pressure sensor 1-1, an operation analysis module 1-2, a signal transmitting module 1-4 and a display screen 1-3, wherein the shell is fixed on the side wall of a roadway 4, the differential pressure sensor 1-1, the operation analysis module 1-2 and the signal transmitting module 1-4 are fixed in the shell, the display screen 1-3 is fixed on the surface of the shell, a detection pipe I1-6 and a detection pipe II 1-7 are arranged on the shell, one end of the detection pipe I1-6 and one end of the detection pipe II 1-7 are respectively connected with two detection ends of the differential pressure sensor 1-1 in the shell, a monitoring pipeline 3 is fixed on the side wall of the roadway 4 and is horizontally arranged along the direction of the roadway 4, the other end of the detection pipe I1-6 is connected with one end of the monitoring pipeline 3 through a pipeline, the other end of, the device is used for collecting the air pressure of the section I5 of the roadway; the other end of the detection pipe II 1-7 is provided with a dust filter sleeve II 2-2 for collecting the air pressure of the section II 6 of the roadway where the dust filter sleeve is located; the dust filter sleeve I2-1 and the dust filter sleeve II 2-2 are positioned on the same horizontal plane;
the differential pressure sensor 1-1 is used for detecting differential pressure data between the detection pipes I1-6 and the detection pipes II 1-7 in real time and feeding the differential pressure data back to the operation analysis module 1-2; the operation analysis module 1-2 receives the differential pressure data for calculation processing, displays the calculated real-time air volume through a display screen 1-3, and simultaneously carries out wireless transmission through a signal transmitting module 1-4;
the dust filter sleeve I2-1 consists of a hollow cylinder and a hollow sphere, one end of the hollow cylinder is connected with the hollow sphere, a plurality of through holes are formed in the surface of the hollow sphere, and the other end of the hollow cylinder is connected with the other end of the monitoring pipeline 3; the structure of the dust filter sleeve II 2-2 is the same as that of the dust filter sleeve I2-1.
Further, the hanging device also comprises hooks 1-5, wherein the hooks 1-5 are arranged outside the shell and used for hanging the shell on the side wall of the roadway 4.
Further, the operation analysis module 1-2 is a single chip microcomputer.
Further, the length of the hollow cylinder is greater than 20mm, the diameter of the through hole is 1mm, and the length of the monitoring pipeline 3 is not less than 50 m. By adopting the size, the accurate air pressure difference between the roadway section I5 and the roadway section II 6 can be obtained through measurement.
A monitoring method of a roadway air quantity accurate monitoring system comprises the following specific steps:
A. the accurate monitoring system for the tunnel air volume is arranged in a tunnel 4 needing to measure the air volume, and then the area S1 of a tunnel section I5, the area S2 of a tunnel section II 6 and the elevation Z of the tunnel section I5 are obtained through measurement1And the elevation Z of the roadway section II 62The gravity acceleration g of the roadway section between the roadway section I5 and the roadway section II 6, the total wind resistance R of the roadway section between the roadway section I5 and the roadway section II 6, and the gas density rho of the roadway section between the roadway section I5 and the roadway section II 6, and the measured value is taken as a constant valueInputting the number into an operation analysis module 1-2;
B. when the roadway air volume detection is started, gas at a roadway section I5 is filtered by a dust filter sleeve I2-1 and then enters a monitoring pipeline 3, and is transmitted to a differential pressure sensor 1-1 through a detection pipe I1-6, meanwhile, gas at a roadway section II 6 is filtered by a dust filter sleeve II 2-2 and then enters a detection pipe II 1-7 and is transmitted to the differential pressure sensor 1-1, the differential pressure sensor 1-1 detects the air pressure difference between the detection pipe I1-6 and the detection pipe II 1-7, and transmits air pressure difference data to an operation analysis module 1-2;
C. the operation analysis module 1-2 combines the received air pressure difference data with a stored calculation formula to perform analysis processing, and the specific process is as follows:
according to the ventilation resistance law, the following results are obtained:
h＝RQ2(1)
in the formula: h is the ventilation resistance of the tunnel section between the tunnel section I5 and the tunnel section II 6; q is the air volume of the tunnel section between the tunnel section I5 and the tunnel section II 6;
from bernoulli's equation:
in the formula: h' is the energy loss of air in unit volume between the roadway section I5 and the roadway section II 6; v. of1The wind speed is the wind speed at the position of a roadway section I5; v. of2The wind speed is the wind speed at the position of a roadway section II 6; p1The air pressure at the position of a roadway section I5 is adopted; p2The air pressure at the position of a roadway section II 6 is adopted;
is a loss of kinetic energy; p1-P2The air pressure difference between the roadway section I5 and the roadway section II 6 is obtained;
because the kinetic energy loss cannot be directly measured
Therefore, h 'cannot be directly obtained, and therefore the h' is obtained by adopting an iterative algorithm, specifically:
a. firstly, neglecting the kinetic energy loss in the formula (2), and then the formula (2) becomes the following formula (3);
h0’＝(P1-P2)+gρ(Z1-Z2) (3)
the air pressure difference measured by the differential pressure sensor 1-1 is substituted into the formula (3), thereby obtaining h0The value of';
b. h is to be0The value of' is taken as the ventilation resistance h, and is substituted into the formula (1) to obtain a first air volume iteration value Q0Since S is known1And S2Can thus derive a first iterative value v of wind speed1And v2(ii) a And obtaining the wind speed iteration value
A value of (d);
c. h is to be0' value and
to obtain a first ventilation resistance iteration value h1'; then h is mixed1' as ventilation resistance h, and repeating steps b and c to obtain a second iterative ventilation resistance value h2’；
d. Circularly repeating the steps b and c until the nth ventilation resistance iteration value h is obtainedn' and the last value hn-1' when the difference between the values is less than 1Pa, the iterative operation is ended, and h is calculatednThe method comprises the steps of substituting the formula (1) into the formula (1) to obtain the air quantity Q of a roadway section between a roadway section I5 and a roadway section II 6, and finally displaying the obtained air quantity Q through a display screen 1-3 and simultaneously carrying out wireless transmission through a signal transmitting module 1-4.
Claims (5)
1. An accurate monitoring system for tunnel air volume is characterized by comprising an air volume monitoring device and a monitoring pipeline,
the air quantity monitoring device comprises a shell, a differential pressure sensor, an operational analysis module, a signal transmitting module and a display screen, wherein the shell is fixed on the side wall of a roadway, the differential pressure sensor, the operational analysis module and the signal transmitting module are fixed in the shell, the display screen is fixed on the surface of the shell, the shell is provided with a detection tube I and a detection tube II, one end of the detection tube I and one end of the detection tube II are respectively connected with two detection ends of the differential pressure sensor in the shell, a monitoring pipeline is fixed on the side wall of the roadway and horizontally arranged along the trend of the roadway, the other end of the detection tube I is connected with one end of the monitoring pipeline through a pipeline, and the other end of the monitoring pipeline is provided with; the other end of the detection pipe II is provided with a dust filter sleeve II for collecting the air pressure of the roadway section II; the dust filter sleeve I and the dust filter sleeve II are positioned on the same horizontal plane;
the differential pressure sensor is used for detecting differential pressure data between the detection pipe I and the detection pipe II in real time and feeding the differential pressure data back to the operation analysis module; the operation analysis module receives the differential pressure data for calculation processing, and displays the calculated real-time air volume through a display screen and simultaneously wirelessly transmits the real-time air volume through the signal transmitting module;
the dust filter sleeve I is composed of a hollow cylinder and a hollow sphere, one end of the hollow cylinder is connected with the hollow sphere, a plurality of through holes are formed in the surface of the hollow sphere, and the other end of the hollow cylinder is connected with the other end of the monitoring pipeline; the structure of the dust filter sleeve II is the same as that of the dust filter sleeve I.
2. The accurate monitoring system of tunnel air volume of claim 1, characterized by further comprising a hook, the hook is arranged outside the casing and is used for hanging the casing on the side wall of the tunnel.
3. The accurate monitoring system of tunnel air volume of claim 1, characterized in that the operation analysis module is a single chip microcomputer.
4. The accurate monitoring system of tunnel amount of wind of claim 1, characterized in that, hollow cylinder's length is greater than 20mm, the through-hole diameter is 1mm, monitoring pipeline's length is not less than 50 m.
5. A monitoring method adopting the roadway air volume accurate monitoring system of any one of claims 1 to 4 is characterized by comprising the following specific steps:
A. the accurate monitoring system for the tunnel air volume is installed in a tunnel needing to measure the air volume, and then the area S1 of the tunnel section I, the area S2 of the tunnel section II and the elevation Z of the tunnel section I are obtained through measurement1And the elevation Z of the roadway section II2The gravity acceleration g of a tunnel section between the tunnel section I and the tunnel section II, the total wind resistance R of the tunnel section between the tunnel section I and the tunnel section II, and the gas density rho of the tunnel section between the tunnel section I and the tunnel section II are input into the operational analysis module by taking the measured values as constants;
B. when the tunnel air volume detection is started, gas at a tunnel section I is filtered by a dust filter sleeve I and then enters a monitoring pipeline, and is transmitted to a differential pressure sensor through a detection pipe I, meanwhile, gas at a tunnel section II is filtered by a dust filter sleeve II and then enters a detection pipe II and is transmitted to the differential pressure sensor, the differential pressure sensor detects the air pressure difference between the detection pipe I and the detection pipe II, and transmits air pressure difference data to an operational analysis module;
C. the operation analysis module combines the received air pressure difference data with a stored calculation formula to perform analysis processing, and the specific process is as follows:
according to the ventilation resistance law, the following results are obtained:
h＝RQ2(1)
in the formula: h is the ventilation resistance of the tunnel section between the tunnel section I and the tunnel section II; q is the air volume of the tunnel section between the tunnel section I and the tunnel section II;
from bernoulli's equation:
in the formula: h' is the energy loss of air in unit volume between the roadway section I and the roadway section II; v. of1The wind speed is the wind speed at the section I of the roadway; v. of2The wind speed at the section II of the roadway is obtained; p1The air pressure at the section I of the roadway is used; p2The air pressure at the section II of the roadway is used;
is a loss of kinetic energy; p1-P2The air pressure difference between the roadway section I and the roadway section II is obtained;
because the kinetic energy loss can not be directly measured, h' can not be directly obtained, the method adopts an iterative algorithm to obtain the following specific steps:
a. firstly, neglecting the kinetic energy loss in the formula (2), and then the formula (2) becomes the following formula (3);
h0’＝(P1-P2)+gρ(Z1-Z2) (3)
the air pressure difference measured by the differential pressure sensor is substituted into the formula (3), thereby obtaining h0The value of';
b. h is to be0The value of' is taken as the ventilation resistance h, and is substituted into the formula (1) to obtain a first air volume iteration value Q0Since S is known1And S2Can thus derive a first iterative value v of wind speed1And v2(ii) a And obtaining the wind speed iteration value
A value of (d);
c. h is to be0' value and
to obtain a first ventilation resistance iteration value h1'; then h is mixed1' as ventilation resistance h, and repeating steps b and c to obtain a second iterative ventilation resistance value h2’；
d. Circularly repeating the steps b and c until the nth ventilation resistance iteration value h is obtainedn' and the last value hn-1' when the difference between the values is less than 1Pa, the iterative operation is ended, and h is calculatednSubstituting the formula (1) into the formula (1) to obtain the air quantity Q of the tunnel section between the tunnel section I and the tunnel section II, and finally obtaining the obtained air quantityAnd Q is displayed through a display screen and is wirelessly transmitted through a signal transmitting module.
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| CN112377260A (en) * | 2020-10-22 | 2021-02-19 | 中国矿业大学 | Roadway full-section air quantity measuring system and method |
| CN114109470A (en) * | 2021-11-18 | 2022-03-01 | 中国矿业大学 | Mine roadway air quantity accurate measurement system and method |
| 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 |
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Application publication date: 20200828 |