Method for determining air leakage direction and measuring air leakage rate of goaf
A technology of goaf and air leakage, which is applied in measurement, earthwork drilling, wellbore/well components, etc., can solve the problems of high measurement cost, harm, and rough air leakage measurement in goaf, and achieves simple operation and monitoring results. Accurate and reproducible results
Active Publication Date: 2021-11-26
CHINA UNIV OF MINING & TECH (BEIJING)
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[0004] However, the existing tracer technology method is relatively rough for the air leakage measurement of the goaf, and the layout of the experiment scheme is relatively simple, but the air leakage area of the goaf is simply divided into two types: the air leakage area of the working face and the air leakage area of the goaf direction. Air leakage in the working face, but it is impossible to accurately describe the distribution of air leakage between the working face and the goaf and the amount of air leakage between any two points
In addition, most of the existing tracer technology methods need to continuously release tracer gas, the measurement cost is high, and there are certain hazards
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[0046] Such as figure 1 As shown, a method for determining the direction of air leakage in a goaf and measuring the amount of air leakage includes the following steps:
[0047] (1) The first instantaneous SF 6 The gas release device is placed at the position away from the lower corner of the air inlet roadway, which is recorded as the first point, and a SF is placed at the lower corner of the air inlet roadway 6 Gas concentration real-time monitoring device, this position is recorded as the second point, the working surface is divided into n parts on average, and a SF is placed at each division point 6 For the real-time monitoring device of gas concentration, the position of each division point is recorded as the 3rd point, the 4th point...the n+2 point in turn from the position close to the air inlet roadway to the return air roadway. The second instantaneous SF 6 The gas release device is placed at the upper corner of the air return tunnel, and the position is recorded as...
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The invention discloses a method for determining air leakage direction and measuring air leakage rate of a goaf. The method comprises the following steps of: placing an SF6 gas release device in an air inlet roadway, averagely dividing a working surface into n parts, respectively placing an SF6 gas concentration real-time monitoring device at each division point, and carrying out instantaneous release operation of SF6 gas, and after the reading of the SF6 gas concentration real-time monitoring device returns to zero, stopping the measurement; establishing a concentration-time curve according to the concentration of the SF6 tracer gas measured by the SF6 gas concentration real-time monitoring device in real time; according to the area defined by the curve, searching for a position of an air leakage direction transition point k, and if air does not leak along the way or air leaks towards the goaf, keeping the area defined by the concentration of the tracer gas in the air flow of each point along the way unchanged; and if the leaked air flows in along the air flow direction, changing the area enclosed by the concentration of the tracer gas in a laneway in a descending trend. The whole gas diffusion change process between the goaf and the working face can be described in detail.
Description
technical field [0001] The invention relates to the field of coal mine safety, in particular to a method for determining the direction of air leakage in a goaf and measuring the amount of air leakage. Background technique [0002] At present, the safety problems of coal mines in our country are more prominent, and coal seam spontaneous combustion is one of the main disasters in various mining areas. According to the coal seam spontaneous combustion mechanism, the spontaneous combustion of residual coal must meet the following four conditions: ①The coal with the tendency of spontaneous combustion is in a broken and piled state; ②Sufficient oxygen; ③A good heat storage environment; ④It reaches the spontaneous combustion and ignition period. The sufficient oxygen mentioned in the second condition comes from the air leakage in the goaf. The remaining coal in the goaf itself is in a closed state, which can self-heat and store heat well. Bring sufficient oxygen to the residual co...
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IPC IPC(8): E21B47/10
CPCE21B47/10
Inventor 雷柏伟吴兵孟龙川党素娜
Owner CHINA UNIV OF MINING & TECH (BEIJING)