Thermodynamics of the coal dust explosion: Main factors and optimal control

Abstract

The explosion intensity and the low explosion limit of the coal dust explosion are affected by the calorific value and the heat transfer rate of the coal dust, which are closely related to the coal quality index. This paper studies experimentally the low explosive limit of the coal dust with different coal quality indexes. Based on the principal component analysis, the main factors affecting the low explosive limit are obtained by extracting the principal components from the coal quality indexes. Through comparative analysis, a regression model is proposed to predict the low explosive limit for practical applications.

Suppression effect of CaCo3, NaCl, and NH4H2PO4 on gas-fat coal dust explosion pressure and flame characteristics

“…Coal dust explosion will produce destructive pressure waves and flame waves, so explosion pressure and flame have always been the focus of attention at home and abroad [2,3]. The explosion pressure can suspend the deposited coal dust, resulting in secondary explosions and multiple explosions, which are much more destructive than a single explosion [4,5]. Therefore, in order to control the occurrence of coal dust explosions or reduce the losses caused by explosions, many methods of suppressing explosions have been proposed, among which the use of inert dusts to suppress explosions is a very common method [6,7].…”