Abstract
Coal-bed methane(CBM)was a natural gas occurring in underground coal seams, which was mainly composed of methane. In order to study the effect of ignition energy and pressure on the explosion limit of CBM, a special environment 20L explosion characteristic test system was used. The explosion limit of methane under different ignition energy(10∼400J)and pressure (0.1∼1.2MPa)was studied experimentally. The results show that with the increase of ignition energy and initial pressure, the upper limit of methane explosion was obviously increased, the lower limit of explosion was decreasing, and the range of explosion limit was enlarged. Compared with the lower limit of methane explosion, the effect of ignition energy and initial pressure on the upper limit of methane explosion was more obvious. The coupling effect of ignition energy and initial pressure on the explosion limit of methane was greater than that of a single factor, and the effect of ignition energy and initial pressure on the explosion limit was more significant than that of a single factor.
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