Method for forecasting coal and gas outburst on site
A technology of gas outburst and measurement method, which is applied in the direction of gas discharge, earth square drilling, mining equipment, etc., and can solve problems such as insufficient accuracy
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[0058] The first step is to measure the preliminary index of coal and gas outburst prediction K1 value;
[0059] The second step is to introduce a new prediction and judgment index i value,
[0060] Its calculation formula is as follows:
[0061] Q=K 3 T i -W L
[0062] In the formula:
[0063] Q------The total amount of gas desorption when the time is T, cm 3 / g;
[0064] T----time, min
[0065] W L --- Gas loss of coal sample before testing, cm 3 / g;
[0066] K 3 ---constant
[0067] The third step is to determine the value of i, as follows
[0068] 1) Take the coal sample and place it in the coal sample tank;
[0069] 2) Take out the coal sample from the coal seam when converting the desorption speed of the coal sample through the pressure sensor connected to the coal sample tank, put the sample into the coal sample tank after the coal sample sieve, and the sensor converts the speed of the coal sample tank into an electrical signal , sent to the amplifier cir...
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