Abstract
Fully 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 size of pulverized coal, the greater the possibility of agglomeration of pulverized coal particles. The surface of the exploded coal particles produces more developed pores. They are irregularly shaped and have more rounded edges than the original coal.
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The data used to support the findings of this study are available from the corresponding author upon request.
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Acknowledgements
Thanks for the support of Yue Qi Outstanding Scholar Program of China University of Mining & Technology, Beijing, to corresponding author (Baisheng Nie).
Funding
The research was supported by the National Natural Science Foundation of China (Project No. 51974322); Fundamental Research Funds for the Central Universities (Project No. 2009KZ03); and the opening project of State Key Laboratory of Explosion Science and Technology (Beijing Institute of Technology) (Project No. KFJJ21-05M).
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Hongwei Yan: experiment, methodology, analysis, writing - original & editing.
Baisheng Nie: methodology, software, writing - review draft.
Chao Peng: supervision, resources.
Peijun Liu: visualization.
Xiaotong Wang: Investigation.
Feifei Yin: visualization.
Jie Gong: visualization.
Yueying Wei: investigation.
Shuangshuang Lin: investigation.
Qiang Gao: investigation.
Mingwei Cao: investigation.
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Yan, H., Nie, B., Peng, C. et al. Evaluation on explosion characteristics and parameters of pulverized coal for low-quality coal: experimental study and analysis. Environ Sci Pollut Res 29, 18851–18867 (2022). https://doi.org/10.1007/s11356-021-17170-6
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DOI: https://doi.org/10.1007/s11356-021-17170-6