Flame-propagation behavior and a dynamic model for the thermal-radiation effects in coal-dust explosions |
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| Institution: | 1. School of Chemical Machinery, Dalian University of Technology, Dalian, Liaoning 116024, PR China;2. Department of Chemical System Engineering, School of Engineering, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8656, Japan;3. Sichuan Fire Research Institute of Ministry of Public Security, Chengdu, Sichuan 610036, PR China;1. School of Chemical Machinery and Safety Engineering, Dalian University of Technology, Dalian 116024, China;2. Department of Chemical System Engineering, School of Engineering, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-8656, Japan;3. School of Mining and Safety Engineering, Shandong University of Science and Technology, Qingdao 266590, China;4. State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China |
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| Abstract: | To reveal the flame-propagation behavior and the thermal-radiation effects during coal-dust explosions, two coal-dust clouds were tested in a semi-enclosed vertical combustion tube. A high-speed video camera and a thermal infrared imaging device were used to record the flame-propagation process and the thermal-radiation effects of the fireball at the combustion-tube outlet. The flame propagated more quickly and with a higher temperature in the more volatile coal-dust cloud. The coal-dust concentration also significantly affected the propagation behavior of the combustion zone. When the coal-dust concentration was increased, the flame-propagation velocity and the fireball temperature increased before decreasing overall. Based on the experimental results, a dynamic model of the thermal radiation was employed to describe the changes in the fireballs quantitatively and to estimate the thermal-radiation effects during coal-dust explosions. |
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| Keywords: | Coal-dust explosion Flame-propagation behavior Fireball thermal radiation Dynamic model |
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