Abstract
Gas production during the low-temperature oxidation and pyrolysis of coal and the effects on methane-air flammable limits are examined. An oil bath temperature-programmed system was used to study gas generation. The production rate of the most important gas indicating pyrolysis, carbon monoxide, was calculated using a mathematical model. Gas production rates as a function of temperature for different ranks of coal were obtained and analyzed, and gas generation mechanisms are proposed and discussed. Experimental results showed that the types and sequence of gases released during low-temperature oxidation are basically the same for different ranks of coal. Microstructures in the coal are responsible for the amount of gases released during oxidation. The effects of the gases released on methane-air flammable limits were experimentally studied using gas-propagation cylindrical equipment. Analysis of the parameters of flammability, namely, the upper flammable limit lower flammable limit and explosion risk value revealed that the release of C2H6, C2H4, CO, H2, and their mixture decrease the flammability of a CH4–air mixture but increase the risk of explosion.
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