Evaluation on explosion characteristics and parameters of pulverized coal for low-quality coal: experimental study and analysis

Environ Sci Pollut Res Int. 2021 Oct 26. doi: 10.1007/s11356-021-17170-6. Online ahead of print.ABSTRACTFully utilizing the energy generated by the explosion of pulverized coal will contribute to realize the clean and efficient exploitation of coal resources. The pulverized coal explosion characteristics will be a far-reaching and important task to explore. In this paper, ten kinds of low-quality coals such as high sulfur, high ash, and low metamorphic degree coals were investigated and the minimum ignition energy (MIE), lower explosion limit (LEL), and explosion intensity (EI) parameters under different particle sizes and coal powder concentration conditions were also analyzed combined with a 1.2-L Hartmann tube and a 20-L explosion sphere experimental system. Finally, the morphological characteristics of the exploded coal powder surface were evaluated by scanning electron microscopy (SEM). The results show that the particle size is positively correlated with MIE. LEL shows an inverted "U"-shaped trend with the increasing degree of coal deterioration. The low-rank coal is more flammable and explosive. The maximum pressure PMax at the LEL concentration and maximum pressure rise rate (dP/dt)Max overall value is small. Here, optimum pulverized coal particle size (75μm) for explosive utilization of low-quality coal was determined. Within 50-225 g/m3 of pulverized coal concentration range, the explosion intensity increases with increasing concentration. The smaller the particle ...
Source: Environmental Science and Pollution Research International - Category: Environmental Health Authors: Source Type: research