Abstract
With the continuing advance of deep coal mining, temperature has become an important factor affecting coal methane recovery and gas dynamic disaster prevention. However, the influence of coal temperature on the whole process of gas desorption (including initial period) and released gas energy has been rarely studied. In this paper using a self-designed gas desorption device, the gas desorption characterization, e.g. desorption capacity, desorption theoretical model and released gas expansion energy law under varied temperatures were investigated. The results show that the increased coal temperature increases the gas desorption capacity, e.g. desorption amount and rate. However, for the same coal sample, the increased effect under the same gas pressure is weaker than that under the same gas adsorption amount. Compared with exponential function, the gas desorption law at different temperatures is more in line with the power function. The ratio of initial desorption amount of gas (∼10 s) increases with the increasing temperature, even up to 50%. The initial released gas expansion energy accordingly increases with the increase of temperature, showing a linear change between them. Moreover, the change degree of initial released gas expansion energy is greater under the same gas adsorption capacity compared with the same gas pressure. Meanwhile, with the increase of desorption time the linear correlation degree between the initial released gas expansion energy and gas desorption amount decreases. This represents that shortening measurement time will make the outburst risk results more credible when the gas desorption amount is used to determine the outburst risk of coal masses.
Published Version
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