1 Subject content and scope of application
This standard specifies the instrument for measuring the resistance of mine ventilation, the measurement procedure, the calculation and calculation of the measurement results.
This standard applies to the measurement of coal mine ventilation resistance roadway.
2 terms
2.1 Main route
When determining the ventilation resistance of the mine, the selected ventilation path from the inlet to the well (or the bottom of the well) to the wind and alleys, the mining area, the returning wind alley, and the return air to the wind.
2.2 Secondary route
When determining the ventilation resistance of the mine, the selected ventilation route except the main route.
3 instruments
The following measuring instruments should be verified and used within the validity period.
a. Ordinary empty box barometer:
Measuring range 80 ~ 107kPa (equivalent to 600 ~ 800mmHg), the minimum division value of 50Pa;
b. Tilt differential pressure gauge:
Measuring range 0～3000Pa, minimum division value 10Pa;
c. Precision barometer:
Measuring range 83.6 ~ 114kPa, the minimum division value is 25Pa;
d. Ventilation wet and dry thermometer:
Measuring range -25 to +50 ° C, minimum division value of 0.2 ° C;
e. Pitot tube:
Correction coefficient is 0.998~1.004;
f. Low speed anemometer:
The measuring range is 0.2~5m/s, and the starting wind speed is ≤0.2m/s;
g. Medium speed anemometer:
The measuring range is 0.4~10m/s, and the starting wind speed is ≤0.4m/s;
h. High speed anemometer:
Impeller: measuring range 0.8 ~ 25m / s, starting wind speed ≤ 0.5m / s;
Cup type: measuring range 1.0~30m/s, starting wind speed ≤0.8m/s;
i. Stopwatch:
The minimum division value is 1 s;
j. Steel tape measure:
2m steel tape measure: measuring range 0~2m, minimum division value 1.0mm;
30m steel tape measure: measuring range 0~30m, minimum division value 1.0mm;
k. Rubber tube (or plastic tube):
Inner diameter 4 ~ 5mm;
l. Rubber pipe joints:
The inner diameter is 3 to 4 mm, the outer diameter is 5 to 6 mm, and the length is 50 to 80 mm.
4 Determination steps
4.1 Determination of route selection
Select the primary and secondary routes of the measurement on the ventilation system map. At the same time, it is necessary to consider the completion of the route within a work shift; when the measurement route is long, it can be segmented and grouped.
4.2 Measuring point selection
First, arrange the measuring points on the ventilation system map according to the selected measuring route, and number them in order. Then, according to the actual situation of the well, the position of the measuring point is determined and marked.
The following requirements should be met when selecting a measuring point:
a. The measuring point should be selected before or after the wind dividing point or the closing point. It shall not be less than 3 times the width of the roadway in the front; it shall not be less than 8 times the width of the roadway in the rear;
b. When selecting a place where the roadway turns and the section changes greatly, the front should not be less than 3 times the width of the roadway; the rear should not be less than 8 times the width of the roadway;
c. The roadway should be well supported within 3m before and after the measuring point, and there is no accumulation in the roadway;
d. The pressure difference between the two measuring points should be no less than 20Pa.
4.3 Differential pressure gauge method
4.3.1 Wind pressure measurement
Starting from the measuring point 1, a pitot tube is set at each of the measuring points 1, 2, and a differential pressure gauge is generally installed at 6 to 8 m on the leeward side of the measuring point 2. The pitot tube should be placed in a location where the wind flow is stable, facing the wind. The differential pressure gauge should be installed close to the wall of the roadway, zero or record the initial reading. The rubber tube should be prevented from being folded and blocked by water, dirt, etc. After the air temperature in the rubber tube is equal to the air temperature in the roadway, the two rubber tubes are placed on the differential pressure gauge, and the liquid level is stabilized after the differential pressure gauge is read. And fill in the form A4.
After the measurement points 1, 2 are measured, the differential pressure gauge can be moved, and the measurement between the measurement points 2 and 3 is performed. The measurement is performed in the order of the measurement points in sequence until the entire route is measured.
The measurement sequence can also be performed in the opposite direction of the wind flow.
4.3.2 Wind speed measurement
To measure the wind speed with an anemometer, measure it three times and take the average wind speed value. And fill in the form A2.
4.3.3 Measurement of atmospheric physical parameters
The atmospheric pressure is measured using an empty box barometer; the dry bulb temperature and the wet bulb temperature of the air are measured with a vented dry and wet thermometer. And fill in Table A3.
4.3.4 Measurement of roadway sectional area and perimeter parameters
According to the shape of the roadway section of the measuring point, the measurement is made with a steel tape measure. And fill in Table A1.
4.3.5 Measuring point spacing measurement
Use a steel tape measure to measure the distance between the two measuring points. And fill in Table A1.
4.4 Barometer method
4.4.1 Wind pressure measurement
4.4.1.1 Point-by-point measurement method:
Adjust two precision barometers (I, II) at the wellhead or downhole yard and record the initial readings. Instrument I stays in place to monitor atmospheric pressure changes, and records every 10 to 15 minutes. Instrument II measures the absolute static pressure of each flow point according to the point of measurement. And fill in Table A5.
4.4.1.2 Simultaneous determination of double measuring points:
At point I, adjust two precision barometers (I, II) and record the initial reading. Then, the instrument I remains in place, and the instrument II is placed at the measuring point 2, and the two instruments simultaneously read in the agreed time. Then move the instrument I to the measuring point 2, while reading, the instrument I does not move, move the instrument II to the measuring point 3, and then the two instruments simultaneously read in the agreed time. Go ahead and measure until finished. And fill in the form A6.
4.4.2 Wind speed measurement is the same as 4.3.2
4.4.3 Measurement of atmospheric physical parameters is the same as 4.3.3
4.4.4 Roadway sectional area and perimeter parameter measurement is the same as 4.3.4
4.4.5 Measurement of measuring point spacing is the same as 4.3.5
4.4.6 Point height measurement
The elevation of each measuring point is given by the geodetic department.
5 Calculation results calculation (omitted)
6 measurement result processing
6.1 Determination of reliability check
When determining the ventilation resistance of the selected measurement route, it is necessary to make the necessary supplementary measurements at the same time in order to check the air volume balance and the resistance balance of the ventilation network. Simultaneously. The error of the measured value of the whole ore resistance is checked by the relative static pressure measurement and the natural wind pressure value according to the wind, and the reliability is determined.
6.2 Preparation of mine ventilation resistance measurement report
The contents of the report mainly include: measurement time, measurement purpose and requirements, ventilation and production of the mine at that time, measurement route selection, personnel organization, use of instruments, measurement methods, measurement results, mine ventilation resistance distribution, drawing resistance distribution curve, analysis and improvement Suggestions for mine ventilation conditions, etc.
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