Abstract
In order to restore the oxidative self-heating behavior of coal stockpiles more realistically, Considering the characteristics that the larger particle size in the actual coal stockpiles affects the airflow and oxidation heating performance, this study uses the Brinkman-Forchheimer equation to describe the airflow in the coal stockpiles more accurately, and obtains the heating characteristics of large-grained coal in the stockpiles by conducting adiabatic oxidation experiments on multi-grained coal combined with oxidation kinetic theory. It is found that the activation energy is proportional to the inverse of the particle size in a specific particle size range. Numerical simulation studies were carried out to analyze the parameters affecting the coal stockpiles' self-ignition, calorific value loss, and greenhouse gas emission. It was found that as the inlet wind speed increased, the modes of influence for the change of maximum temperature are heat dissipation intensity control, oxygen concentration control in the whole stage, and oxygen concentration control in the high-temperature stage; the modes of influence for the change of high-temperature area distribution are reflected as heat dissipation intensity control, oxygen concentration control and the combined control of heat dissipation intensity and oxygen concentration. When the inlet wind speed is less than 2 m/s, it can effectively delay the warming of the coal stockpiles, which is conducive to the control of spontaneous combustion, the maintenance of calorific value, and the reduction of greenhouse gas release from the coal stockpiles. The coal stockpiles with minor porosity, small particle size, and smaller slope angle can store the coal more safely, efficiently, and environmentally friendly. The degree of influence of each factor on the self-heating is from largest to smallest: particle size, porosity, slope angle, and height. This study has a significant guiding value for coal's safe, economical, and green storage.
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