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The effect of heating rate on radical concentration during coal pyrolysis
Affiliation:1. Research Chair for Tribology, Surface, and Interface Sciences, Department of Physics and Astronomy, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia;2. Department of Physics, Thamar University, Dhamar, Yemen;3. King Abdullah Institute for Nanotechnology, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia;4. Mechanical Engineering Department, King Saud University, Riyadh 11421, Saudi Arabia;5. Sustainable Energy Technologies Center, King Saud University, Riyadh 11421, Saudi Arabia;1. Department of Mechanical & Electrical Engineering, Xiamen University, Xiamen 361005, China;2. School of Aerospace Engineering, Xiamen University, Xiamen 361005, China;3. School of Engineering, San Francisco State University, San Francisco 94132, USA;4. Department of Mechanical Engineering, University of California at Berkeley, CA 94720, USA;5. Science and Technology on Electronic Test and Measurement Laboratory, North University of China, Tai Yuan 030051, China;6. School of Mechanical Engineering, Xi’an Jiaotong Univeristy, Xi’an, China;1. CIRIMAT, Université de Toulouse, ENSIACET, CS 44352, 31030 Toulouse Cedex 4, France;2. Saint-Gobain Pont-à-Mousson, Les Longues Raies, BP 109, 54704 Pont-à-Mousson Cedex, France;3. CINVESTAV Saltillo, Av. Industria Metalúrgica 1062, Parque Industrial Saltillo-Ramos Arizpe, Ramos Arizpe, Coahuila, 25900, Mexico
Abstract:The effect of heating rate on the change in radical concentration during coal pyrolysis has been studied using high temperature ESR with a rapid scan unit. The maximum radical concentration of Yallourn coal decreased with an increase in the heating rate. The results were compared with those obtained from a theoretical treatment of the kinetics of radical formation. The effect of a catalyst on the change in radical concentration has also been monitored under rapid heating condition. The maximum radical concentration of the coal/ZnCl2 system showed a significant shift to temperature about 100 K lower than that of coal alone.
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