A reactivity study of chars obtained at different temperatures in relation to their petrographic characteristics |
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| Affiliation: | 1. Fibre and Particle Engineering, Faculty of Technology, PO Box 4300, 90014 University of Oulu, Finland;2. Process Metallurgy, Faculty of Technology, University of Oulu, PO Box 4300, 90014 University of Oulu, Finland;3. Ekolite Inc., Sampsankatu 4B, PO Box 20520, Turku, Finland;4. Haarla Oy, Pyhäjärvenkatu 5 A, 33200 Tampere, Finland;5. Ekokem Palvelu Oy, Kuulojankatu 1, PO Box 181, 11101 Riihimäki, Finland;1. Institute of Clean Coal Technology, East China University of Science and Technology, Shanghai 200237, China;2. State Key Laboratory of High-Efficiency Utilization of Coal and Green Chemical Engineering, Ningxia University, Yinchuan 750021, China;1. School of Earth and Space Science, Peking University, Beijing 100871, China;2. Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China;3. Oil and Gas Institute, Peking university, Beijing 100871, China;1. Microbial Corrosion and Bio-Environmental Engineering, CSIR-Central Electrochemical Research Institute, Karaikudi 630006, India;2. National Institute of Technology, Durgapur, West Bengal 713209, India;3. CSIR-Central Leather Research Institute, Adyar, Chennai 600020, India;4. Defence Research and Development Organisation, Gwalior 474002, India;1. School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China;2. Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou 310012, China;1. Ningbo Municipal Key Laboratory of Clean Energy Conversion Technologies,The University of Nottingham Ningbo China, 199 Taikang East Road, Ningbo, 315100, China;2. School of Environment & Chemical Engineering,Nanchang University, 999 Xuefu Road, Nanchang, 330031, China;3. Department of Chemical and Environmental Engineering, University of Nottingham, University Park, Nottingham NG7 2RD, UK |
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| Abstract: | This study reports on the reactivity of chars obtained at 1000°C and 1300°C (within the range of temperatures reached by coal particles in the near-burner zone of pulverised fuel boilers) from three different coals. The coals were selected according to petrographic criteria: two of them are high volatile bituminous coals differing in maceral composition and the third one is a vitrinite-rich low volatile bituminous coal.The morphology and optical texture of the chars were studied by optical microscopy. The kinetic parameters for the combustion of the high temperature chars under Regime I (combustion controlled by chemical kinetics) have been obtained and related to the optical texture and reflectance of the chars. The intrinsic reactivity of the high temperature chars was found to be lower than that of the low temperature chars, whereas the enhanced porosity observed in the high temperature chars had a positive effect on their combustion reactivity under Regime II (combustion controlled by oxygen pore diffusion). The intrinsic reactivities of the chars decreased following the sequence: vitrinite-rich low rank char>inertinite-rich char>vitrinite-rich high rank char. As the combustion temperature increases, the reactivity of the inertinite-rich char approaches that of the low rank vitrinite-rich char, which justifies the good performance observed for high volatile bituminous inertinite-rich coals in power plants. |
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