Study on acceleration and suppression properties of coal gangue with different void fractions on gas explosion propagation |
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| Affiliation: | 1. Key Laboratory of Gas and Fire Control for Coal Mines (China University of Mining and Technology), Ministry of Education, Xuzhou, 221116, China;2. School of Safety Engineering, China University of Mining and Technology, Xuzhou, 221116, China;3. Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, China;1. Dipartimento di Ingegneria Industriale, Università degli Studi di Padova, Via Marzolo 9, 35131, Padova, Italy;2. Dipartimento di Ingegneria Civile, Chimica, Ambientale e dei Materiali, Università degli studi di Bologna, Via Terracini 28, 40131, Bologna, Italy;3. Corpo Nazionale dei Vigili del Fuoco Comando Venezia, Via Motorizzazione 7, 37100, Venezia, Italy;4. Dipartimento di Ingegneria Civile, Edile e Ambientale, Via Marzolo 9, 35131, Padova, Italy;1. Industry School of Standardization, University of Jinan, Jinan, China;2. State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, China;3. Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology (CICAEET), Nanjing University of Information Science & Technology, Nanjing, Jiangsu, China;1. Slovak University of Technology in Bratislava, Faculty of Materials Science and Techology in Trnava, Institute of Integral Safety, Jána Bottu, 2781/25, Trnava, Slovakia;2. Slovak University of Technology in Bratislava, Faculty of Materials Science and Techology in Trnava, Institute of Materials, Jána Bottu, 2781/25, Trnava, Slovakia;1. School of Safety Science and Engineering, Changzhou University, No. 21, Gehu Mid-Rd., Wujin Dist., Changzhou, 213164, Jiangsu, China;2. School of Materials Science and Engineering, Changzhou University, No. 21, Gehu Mid-Rd., Wujin Dist., Changzhou, 213164, Jiangsu, China |
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| Abstract: | Gas explosion is one of the main disasters in coal mining. Plenty of coal gangue are generally distributed in the disaster areas in gob. Experiments were carried out to explore the propagation law of the gas explosion distributed by coal gangue. The variation characteristics of the overpressure, pressure rise rate, and flame shape with void fractions were analyzed. The results showed that the effect of the coal gangue on the explosion intensity changed from suppression to acceleration with the increase of void fraction, the flame front upstream blockage area changed from laminar state to turbulent divergent state, and a reverse flame was formed. When the void fraction of the coal gangue was 0.50–0.65, the maximum overpressure downstream of the blocked area were positively correlated with the void fraction and the critical suppression range was between 0.50 and 0.55. When the void fraction was lower than 0.50, the flame was quenched in the coal gangue, neither the flame nor the pressure could pass through the blocked area. It is helpful to guide the improvement of coal recovery process to avoid the expansion of the explosion impact in coalmine gob. |
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| Keywords: | Gas explosion Coal gangue Explosion overpressure Acceleration properties Suppression properties |
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