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Methods of forecasting average irregular methane emissions have proved not to be very reliable, and the increased use and speed of digging machines may force a mine to close until levels of CH(4) have returned to normal. This research programme has three objectives: to establish characteristics of methane emission during mechanised digging, to process the measurements automatically, and to determine ways of ensuring the safety of the excavation. In order to establish a provisional formula on average methane emission, its flow was measured. Measurements were taken of the emission content during the working life of the mine and were correlated with the readings taken at the exit of the drivage, in order to calculate a coefficient of irregularities. This coefficient can be used to determine, given the average methane emission, and according to the rate of progress of the work, the secondary ventilation which is necessary to avoid stoppages due to levels of CH(4) exceeding the limits.

Additional information

Authors: CERCHAR, CERCHAR, Rueil-Malmaison (FR)
Bibliographic Reference: EUR 13444 FR (1991) 37 pp., MF
Availability: (2)
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