Mine ventilation resistance real-time online monitoring method

Abstract

The application discloses a kind of real-time online monitoring methods of mine ventilation resistance, selects the route of maximum ventilation resistance of mine: the number of route of maximum ventilation resistance of mine is determined according to the number of main fan in operation, each in operation main fan, should select a maximum ventilation resistance route passing through coal mining face;Multi-parameter sensor and wind speed sensor arrangement: each single roadway of route of maximum ventilation resistance of mine is arranged with a multi-parameter sensor at two intersection points;In the middle of each single roadway, install a wind speed sensor;Single roadway ventilation resistance real-time online calculation: after receiving the monitoring data of sensor, ground host computer can carry out real-time online calculation and display to the ventilation resistance of single roadway;Real-time online calculation of mine ventilation resistance: the ventilation resistance of each single roadway is accumulated, and the ventilation resistance of route of maximum ventilation resistance of mine can be obtained.The method can carry out real-time online monitoring to roadway ventilation resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mine ventilation, and particularly relates to a mine ventilation resistance real-time online monitoring method. BACKGROUND

[0002] The mine ventilation system is one of important foundations for guaranteeing safe and efficient production and personnel operation safety of the mine. Timely grasping of ventilation resistance, air volume and other data of the mine ventilation system is a key to scientifically adjusting the ventilation system and guaranteeing reasonable and stable operation of the ventilation system. The mine ventilation resistance measurement is an important method for comprehensively obtaining the above data, but at present, the ventilation resistance measurement of the coal mine in China mainly relies on manual operation, and the measurement process is time-consuming, laborious and inefficient. Meanwhile, with continuous mining work, the mine ventilation network is constantly changing. According to the Coal Mine Safety Regulations, the mine ventilation resistance measurement is performed once every three years in most coal mines in China. The basic data obtained in the measurement cycle is greatly lagged behind the actual situation of the mine ventilation system.

[0003] For daily monitoring of the ventilation basic data, the Coal Mine Safety Regulations have the following provisions: the mine must establish a wind measurement system, and at least one comprehensive wind measurement is performed every 10 days; the wind speed sensor should be arranged at the wind measurement station of each mining area, one wing return air roadway and the total return air roadway; the pressure sensor should be arranged at the air shaft of the main ventilator; and the water column meter (pressure gauge) must be installed in the main ventilator room. As can be seen, there is no relevant requirement for daily monitoring of the roadway ventilation resistance, so that the daily measurement of the roadway ventilation resistance is basically not performed in the coal mine in China.

[0004] At present, the intelligent construction of the coal mine in China is being accelerated, and the intelligent construction of the ventilation system is one of important aspects. Real-time monitoring of the ventilation resistance, air volume and other basic data is a necessary condition for realizing the intelligent construction of the ventilation system. However, the real-time monitoring of the roadway ventilation resistance of the coal mine in China cannot meet the requirements of the intelligent construction of the ventilation system at present. SUMMARY

[0005] The present application aims at at least solving one of the technical problems in the prior art.

[0006] To this end, the present application provides a mine ventilation resistance real-time online monitoring method, which has the advantages of high efficiency and real-time.

[0007] The mine ventilation resistance real-time online monitoring method according to the embodiment of the application comprises the following steps: a first step of selecting a mine maximum ventilation resistance route: selecting a maximum ventilation resistance route passing through a coal mining face in a whole mine ventilation network as a mine maximum ventilation resistance route; a second step of arranging a multi-parameter sensor and a wind speed sensor: arranging one multi-parameter sensor at each intersection point of two single roadways on the mine maximum ventilation resistance route, and the multi-parameter sensor at the intersection point between adjacent roadways being shared by the two single roadways; installing one wind speed sensor in the middle of each single roadway; and the monitoring data of the multi-parameter sensor and the wind speed sensor being uploaded to a ground host computer in real time; a third step of single roadway ventilation resistance real-time online calculation: the ground host computer can perform real-time online calculation and display on the ventilation resistance of the single roadway after receiving the monitoring data of the sensor; and a fourth step of mine ventilation resistance real-time online calculation: calculating the ventilation resistance of each single roadway, and adding up the ventilation resistances of the single roadways to obtain the ventilation resistance of the mine maximum ventilation resistance route, that is, the mine ventilation resistance. i The ventilation resistance of the mine maximum ventilation resistance route is obtained by adding up the ventilation resistances of the single roadways, that is, the mine ventilation resistance is obtained.

[0008] The beneficial effects of the application are that the ventilation resistances of the single roadways on the mine maximum ventilation resistance route are measured respectively, the ventilation resistances of the single roadways are added up to obtain the mine ventilation resistance, and the ground host computer performs real-time calculation and display, thereby overcoming the technical problems of time-consuming, labor-intensive, delay and lack of roadway ventilation resistance daily monitoring means in the prior art, a large amount of manpower is saved, the ventilation resistance determination efficiency is improved, and the maximum ventilation resistance can be monitored in real time.

[0009] Further specifically, in the above technical solution, the mine maximum ventilation resistance route is composed of multiple roadways, and intersection points appear at the intersections of the roadways with other roadways in the mine, and a single roadway is between two adjacent intersection points.

[0010] Further specifically, in the above technical solution, when the mine is an extraction ventilation mine, a route with the longest total length of roadways and the least ventilation facilities from an air intake shaft, a coal mining face to a main ventilation machine is selected as the mine maximum ventilation resistance route.

[0011] Further specifically, in the above technical solution, in the extraction ventilation, the air intake shaft inlet and the connection between the air shaft and the main ventilation machine are intersection points.

[0012] Further specifically, in the above technical solution, when the mine is a pressure ventilation mine, a route with the longest total length of roadways and the least ventilation facilities from an air return shaft, a coal mining face to a main ventilation machine is selected as the mine maximum ventilation resistance route.

[0013] Further specifically limited, in the above technical solutions, in the pressure ventilation, the return air shaft wellhead, the air chamber and the main ventilation machine junction are the intersection.

[0014] Further specifically limited, in the above technical solutions, the multi-parameter sensor is used for monitoring the static pressure, temperature and relative humidity at the measuring point.

[0015] Further specifically limited, in the above technical solutions, the wind speed sensor is used for monitoring the average wind speed of the section where it is located.

[0016] Further specifically limited, in the above technical solutions, the wind speed sensor installed in the middle of each single roadway is at least 10m away from any roadway opening of the single roadway.

[0017] Further specifically limited, in the above technical solutions, the ventilation resistance h i of the single roadway is calculated according to the formula:

[0018] h i = P i +E i +h vi (1)

[0019] Wherein, h i represents the ventilation resistance of the i roadway; P i represents the static pressure difference of the i roadway; E i represents the potential pressure difference of the i roadway; h vi represents the dynamic pressure difference of the i roadway.

[0020] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent from the description, or can be learned by practice of the present application. The objects and other advantages of the present application will be realized and achieved by the structure particularly pointed out in the specification, claims and drawings.

[0021] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are specifically described, and the accompanying drawings are described in detail as follows. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments described in the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0023] Figure 1 is the flow chart of the present application;

[0024] Figure 2 is a schematic diagram of a multi-parameter sensor of the present application;

[0025] Figure 3 is a schematic diagram of a multi-parameter sensor arrangement.

[0026] The reference signs in the drawings are: 1, mounting eye; 2, liquid crystal display screen; 3, static pressure probe; 4, temperature probe; 5, relative humidity probe; 6, multi-parameter sensor at measuring point j; 7, multi-parameter sensor at measuring point j+1; 8, wind speed sensor installation position; 9, wind flow direction; 10, upper wind side roadway portal of the ith roadway; 11, lower wind side roadway portal of the ith roadway. DETAILED DESCRIPTION

[0027] In order to make the technical problems, technical solutions and beneficial effects solved by the present application more clearly understood, the present application will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0028] See Figure 1 , Figure 2 and Figure 3 The mine ventilation resistance real-time online monitoring method of the present application needs to be carried out by cooperation of a multi-parameter sensor, a wind speed sensor and a ground host computer, the data measured by the multi-parameter sensor and the wind speed sensor is uploaded to the ground host computer for calculation and display, and specifically includes the following steps:

[0029] Step 1, selecting a mine maximum ventilation resistance route: the number of mine maximum ventilation resistance routes is determined according to the number of main ventilators in operation, and one mine maximum ventilation resistance route should be selected for each main ventilator in operation. When the mine is a mine with extraction ventilation, a route with the longest total length of a roadway and the least ventilation facilities such as air doors and air windows from the air intake shaft, through the coal mining face, to the air shaft of the main ventilator is selected as the mine maximum ventilation resistance route. When the mine is a mine with pressure ventilation, a route with the longest total length of a roadway and the least ventilation facilities such as air doors and air windows from the air return shaft, through the coal mining face, to the air shaft of the main ventilator is selected as the mine maximum ventilation resistance route. The mine maximum ventilation resistance route is composed of multiple roadways, and intersection points will appear at the intersections of these roadways with other roadways in the mine. The roadway between two adjacent intersection points is a single roadway. The air intake shaft of the mine with extraction ventilation, the air return shaft of the mine with pressure ventilation, and the connection between the air shaft and the main ventilator are also treated as intersection points. Specifically, in the mine with extraction ventilation, the air intake shaft inlet and the connection between the air shaft and the main ventilator are intersection points. In the mine with pressure ventilation, the air return shaft inlet and the connection between the air shaft and the main ventilator are intersection points.

[0030] It should be noted that: the total length of roadway and the number of ventilation facilities are the two most important indicators of the influence of mine ventilation resistance. Generally speaking, the longer the total length of roadway, the more ventilation facilities, the greater the roadway ventilation resistance; Conversely, the shorter the total length of roadway, the fewer the ventilation facilities, the smaller the roadway ventilation resistance. Therefore, the total length of roadway and the number of ventilation facilities are used as the fundamental basis for determining the maximum ventilation resistance route of the mine. The maximum ventilation resistance route is selected, that is, the longest total length of roadway and the least ventilation facilities. Generally speaking, the total length of roadway has a greater impact on mine ventilation resistance than the number of ventilation facilities. Therefore, if the two indicators of the longest total length of roadway and the least ventilation facilities cannot be met at the same time, the longest total length of roadway should be considered as the maximum ventilation resistance route of the mine.

[0031] Step 2, multi-parameter sensor and wind speed sensor arrangement: see Figure 3 A multi-parameter sensor is arranged at each intersection of each single roadway on the maximum ventilation resistance route of the mine. A first multi-parameter sensor 6 is arranged at measuring point j of the downwind side roadway mouth 11 of the ith roadway, and a second multi-parameter sensor 7 is arranged at measuring point j+1 of the upwind side roadway mouth 10 of the ith roadway. The multi-parameter sensor at the intersection of the adjacent roadways is shared by the two single roadways. The airflow direction 9 points from the upwind side roadway mouth 10 of the ith roadway to the downwind side roadway mouth 11 of the ith roadway, that is, the airflow direction 9 points from the second multi-parameter sensor 7 to the first multi-parameter sensor 6. A wind speed sensor is installed in the middle of each single roadway. See the wind speed sensor installation position 8 in Figure 3 The monitoring data of the multi-parameter sensor and the wind speed sensor are uploaded to the ground host computer in real time. The multi-parameter sensor is used to monitor the static pressure, temperature, and relative humidity of the measuring point. The wind speed sensor is used to monitor the average wind speed of the section where it is located. The wind speed sensor installed in the middle of each single roadway is at least 10 m away from any roadway mouth of the single roadway.

[0032] See Figure 2 The multi-parameter sensor includes a mounting ring 1, a liquid crystal display 2, a static pressure probe 3, a temperature probe 4, and a relative humidity probe 5. The mounting ring 1 is used to facilitate the installation of the multi-parameter sensor at the two intersections of each single roadway on the maximum ventilation resistance route of the mine. The liquid crystal display 2 is used to display the specific values of the static pressure, temperature, and relative humidity of the measuring point monitored by the multi-parameter sensor. The static pressure probe 3 is used to monitor the static pressure of the measuring point. The temperature probe 4 is used to monitor the temperature of the measuring point. The relative humidity probe 5 is used to monitor the relative humidity of the measuring point.

[0033] Step 3, real-time online calculation of single roadway ventilation resistance: after receiving the monitoring data of the sensor, the ground host computer can perform real-time online calculation and display of the ventilation resistance of the single roadway.

[0034] Ventilation resistance h of single roadway i The calculation formula is:

[0035] h i i +E i +h vi (1)

[0036] Wherein, h i represents the ventilation resistance of the i roadway; P i represents the static pressure difference of the i roadway; E i represents the potential pressure difference of the i roadway; h vi represents the dynamic pressure difference of the i roadway.

[0037] The calculation formula of the static pressure difference P i of the i roadway is:

[0038] P i =P j+1 -P j (2)

[0039] Wherein, P j represents the static pressure at the j measuring point; P j+1 represents the static pressure at the j+1 measuring point; the j measuring point is the downwind side measuring point; the j+1 measuring point is the upwind side measuring point.

[0040] The calculation formula of the potential pressure difference E i of the i roadway is:

[0041] E i =ρ j+1 gZ j+1 -ρ j gZ j (3)

[0042] Wherein, ρ j represents the density of air at the j measuring point; ρ j+1 represents the density of air at the j+1 measuring point; g represents the acceleration of gravity; Z j represents the elevation of the j point multi-parameter sensor installation position; Z j+1 represents the elevation of the j+1 point multi-parameter sensor installation position.

[0043] The elevation Z j of the j point multi-parameter sensor installation position and the elevation Z j+1 of the j+1 point multi-parameter sensor installation position are determined by using the three-dimensional coordinates of the nearest traverse point of the multi-parameter sensor installation position, according to the relative distance between the multi-parameter sensor installation position and the traverse point.

[0044] ​The density of air at the jth measuring point ρ j The calculation formula is:

[0045]

[0046] Wherein, P j represents the static pressure at the jth point; t j represents the temperature at the jth point; represents the relative humidity at the jth point; P j , t j and These three parameters are measured by a multi-parameter sensor; P sj represents the saturated water vapor partial pressure when the temperature is t j The values of saturated water vapor partial pressure at different temperatures are stored in a database in advance and are called when calculating the air density.

[0047] The density of air at the j+1th measuring point ρ j+1 The calculation formula is:

[0048]

[0049] Wherein, P j+1 represents the static pressure at the j+1th point; t j+1 represents the temperature at the j+1th point; represents the relative humidity at the j+1th point; P j+1 , t j+1 and These three parameters are measured by a multi-parameter sensor; P sj+1 represents the saturated water vapor partial pressure when the temperature is t j+1 The values of saturated water vapor partial pressure at different temperatures are stored in a database in advance and are called when calculating the air density.

[0050] The calculation formula of the dynamic pressure difference h vi of the ith roadway is:

[0051]

[0052] Wherein, ρ j represents the density of air at the jth measuring point; ρ j+1 represents the density of air at the j+1th measuring point;

[0053] v j represents the average wind speed of the downwind side of the ith roadway; v j+1 represents the average wind speed of the upwind side of the ith roadway;

[0054] v j and v j+1The wind speed measured by the wind speed sensor is converted, assuming that the cross-sectional area of the roadway at the installation position of the wind speed sensor is S f , assuming that the cross-sectional area of the roadway at the installation position of the wind speed sensor is S j , assuming that the cross-sectional area of the roadway at the installation position of the wind speed sensor is S j+1 . Assuming that the measurement value of the wind speed sensor is V f , since the air volume of each cross section of the i-th roadway is the same, then:

[0055] V f S f =S j v j =S j+1 v j+1 (7)

[0056] Wherein, S f , S j and S j+1 are obtained by manual measurement, and only need to be measured once, and recorded on the ground host computer, and do not need to be measured again in the future; based on the measurement value V f of the wind speed sensor, the wind speed v j and v j+1 at the two roadway openings of the i-th roadway can be obtained.

[0057] Step 4, real-time online calculation of mine ventilation resistance: the ventilation resistance h i of each single roadway is accumulated to obtain the ventilation resistance of the maximum ventilation resistance route, that is, the mine ventilation resistance. The calculation formula of the mine ventilation resistance is:

[0058]

[0059]

[0060] It should be noted that the "maximum ventilation resistance route", "single roadway" and the like mentioned in the present application are only for the purpose of directly explaining the working principle of real-time online monitoring of mine ventilation resistance by using a multi-parameter sensor and a wind speed sensor, and cannot be limited to using this principle in other ventilation resistance measurement places.

[0061] The real-time online monitoring method of mine ventilation resistance of the present application saves manpower, improves efficiency, can monitor the ventilation resistance of the roadway in real time, and can meet the needs of today's digital and intelligent ventilation construction of mines.

[0062] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can make equivalent substitutions or changes to the technical solution and the inventive concept of the present application within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application.​

Claims

1. A real-time online monitoring method for mine ventilation resistance, characterized in that, The method comprises the following steps: Step 1, selecting a mine maximum ventilation resistance route: the number of mine maximum ventilation resistance routes is determined according to the number of main ventilators in operation, and one maximum ventilation resistance route should be selected for each main ventilator in operation and passing through a coal mining face; Step 2, multi-parameter sensor and wind speed sensor arrangement: a multi-parameter sensor is arranged at each intersection of each single roadway on the maximum ventilation resistance route of the mine, and a wind speed sensor is arranged in the middle of each single roadway A first multi-parameter sensor (6) is arranged at measuring point j of the lower wind side roadway mouth (11) of the first roadway, and a second multi-parameter sensor (7) is arranged at measuring point j+1 of the upper wind side roadway mouth (10) of the second roadway The multi-parameter sensor at the intersection of the adjacent roadways is shared by the two single roadways; a wind speed sensor is installed in the middle of each single roadway, and the wind speed sensor is used for monitoring the average wind speed of the section thereof; the wind speed sensor installed in the middle of each single roadway is at least 10 m away from any roadway mouth of the single roadway; the multi-parameter sensor is used for monitoring the static pressure, temperature and relative humidity at the measuring point, and the monitoring data of the multi-parameter sensor and the wind speed sensor are uploaded to the ground host computer in real time; Step 3, real-time online calculation of single roadway ventilation resistance: after receiving the monitoring data of the sensor, the ground host computer can perform real-time online calculation and display on the ventilation resistance of the single roadway; Ventilation resistance of the single roadway The formula for calculating the ventilation resistance is: wherein, represents the ventilation resistance of the first lane; represents the static pressure difference of the first lane; represents the potential pressure difference of the first lane; represents the dynamic pressure difference of the first lane; The formula for calculating the static pressure difference of the first lane is: The formula for calculating the static pressure difference of the first lane is: The formula for calculating the static pressure difference of the first lane is: wherein, Pj represents the static pressure at the jth measurement point; Pj+1 represents the static pressure at the j+1th measurement point; the jth measurement point is a downwind measurement point; the j+1th measurement point is an upwind measurement point; The formula for calculating the pressure difference of the roadway is: The formula for calculating the pressure difference of the roadway is: The formula for calculating the pressure difference of the roadway is: wherein, represents the density of air at the jth measurement point; represents the density of air at the j+1th measurement point; represents the acceleration due to gravity; represents the elevation of the jth point of the multi-parameter sensor installation location; represents the elevation of the j+1th point of the multi-parameter sensor installation location; The formula for calculating the dynamic pressure difference of the roadway is: The formula for calculating the dynamic pressure difference of the roadway is: The formula for calculating the dynamic pressure difference of the roadway is: wherein, the density of air at the jth measurement point; the density of air at the j+1th measurement point; represents the average wind speed at the entry of the first lane on the downwind side; represents the average wind speed at the entry of the first lane on the upwind side; Density of air at the jth measurement point The calculation formula is: wherein Pj represents the static pressure at the jth point; Tj represents the temperature at the jth point; RHj represents the relative humidity at the jth point; and The three parameters are measured by a multi-parameter sensor; Pj represents the saturated water vapor partial pressure at the jth point when the temperature is The values of the saturated water vapor partial pressure at different temperatures are pre-stored in a database for calling when calculating the air density. Density of air at the j+1 measurement point The calculation formula is: wherein Pj+1represents the static pressure at the j+1 point; Tj+1represents the temperature at the j+1 point; RHj+1represents the relative humidity at the j+1 point; and These three parameters are measured with a multi-parameter sensor; Pj+1sat(Tj+1) represents the saturated water vapor partial pressure at the temperature Tj+1, the values of which at different temperatures are pre-stored in a database for calling when calculating the air density; The wind speed measured by the wind speed sensor is converted, assuming that the cross-sectional area of the roadway at the installation position of the wind speed sensor is , assuming that the cross-sectional area of the roadway at the lower wind side of the roadway of the first lane is , assuming that the cross-sectional area of the roadway at the upper wind side of the roadway of the first lane is , assuming that the measurement value of the wind speed sensor is Since the air volume at each cross section of the first lane is the same, there is: Wherein, Respectively by artificial measurement, and only need to measure once, and enter the ground host computer, no need to measure again; based on the wind speed sensor measurement value , the first The wind speed of two roadway entrances of the roadway ; Step 4, real-time online calculation of mine ventilation resistance: the ventilation resistance of each single roadway is calculated The ventilation resistance of the mine maximum ventilation resistance route is obtained by accumulation, that is, the mine ventilation resistance is obtained.

2. The method for real-time online monitoring of mine ventilation resistance according to claim 1, characterized in that: The mine maximum ventilation resistance route is composed of multiple roadways, and intersection points appear at the intersections of the roadways with other roadways in the mine, and the roadway between two adjacent intersection points is a single roadway.

3. The method for real-time online monitoring of mine ventilation resistance according to claim 2, characterized in that: When the mine is a mine with extraction ventilation, a route with the longest total length and the least ventilation facilities from the air intake shaft, the coal mining face to the air shaft of the main ventilator is selected as the mine maximum ventilation resistance route.

4. The method for real-time online monitoring of mine ventilation resistance according to claim 3, characterized in that: In extraction ventilation, the air intake shaft inlet, the air shaft and the connection of the main ventilator are intersection points.

5. The method for real-time online monitoring of mine ventilation resistance according to claim 2, characterized in that: When the mine is a mine with pressure ventilation, a route with the longest total length and the least ventilation facilities from the air return shaft, the coal mining face to the air shaft of the main ventilator is selected as the mine maximum ventilation resistance route.

6. The method for real-time online monitoring of mine ventilation resistance according to claim 5, characterized in that: In pressure ventilation, the air return shaft wellhead, the air shaft and the connection of the main ventilator are intersection points.

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