Potential safety evaluation method based on temperature variation during gas adsorption and desorption on coal surface

Publication date: March 2019Source: Safety Science, Volume 113Author(s): Tao Yang, Peng Chen, Bo Li, Baisheng Nie, Chuanjie Zhu, Qiusheng YeAbstractThe mechanism of gas adsorption and desorption is very important for mine safety. Meanwhile, the gas adsorption or desorption process may lead to temperature or heat variation. In order to reveal this phenomenon, the relationship between gas adsorption (and desorption) and temperature of three different coal samples was experimentally investigated under different temperatures, coal ranks and equilibrium pressures. It’s found that gas adsorption quantity, gas adsorption rate and temperature variation decreased with temperature. Additionally, the variation of equilibrium pressures and the gas adsorption quantity were larger when the particle size was smaller. The more the equilibrium pressure is, the more the maximum temperature variation and the rate of temperature variation are. On the other hand, the higher the temperature is, the more the desorption quantity is, but the desorption rate and the maximum temperature variation of dropping increase with the temperature increasing. And the desorption quantity and the rate of desorption temperature increased when the particle sizes became larger. Besides, the gas adsorption quantity of coal samples with high metamorphic grade was larger under same equilibrium pressure, the temperature variation of dropping of ZX-2# is as much as the ML-8#. As a result, ZX-2# coal can accumulate a lar...
Source: Safety Science - Category: Occupational Health Source Type: research