Application of lean flammability limit study and large eddy simulation to burner development for an oxy-fuel combustion system |
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| Authors: | Masayuki Taniguchi Kenji Yamamoto Teruyuki Okazaki Sebastian Rehfeldt Christian Kuhr |
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| Institution: | 1. Plant Analysis Unit, Hitachi Research Laboratory, Hitachi, Ltd., 7-1-1 Omika-cho, Hitachi-shi, Ibaraki-ken, 319-1292, Japan;2. Hitachi Power Europe GmbH, Schifferstraβe 80, 47059 Duisburg, Germany;1. School of Mechanical and Manufacturing Engineering, The University of New South Wales, Sydney, NSW 2052, Australia;2. School of Photovoltaic and Renewable Engineering, The University of New South Wales, Sydney, NSW 2052, Australia;1. Energy Technology Research Group, Faculty of Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, UK;2. Combustion Technology, Department of Mechanical Engineering, Eindhoven University of Technology, Eindhoven, The Netherlands;3. Department of Mechanical Engineering, University College London, Torrington Place, London WC1E 7JE, UK;4. Center for Combustion Energy, Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China;5. Engineering Department, Lancaster University, Lancaster, Lancashire LA1 4YR, UK;1. LIFTEC, CSIC – Universidad de Zaragoza, María de Luna, 10, 50018 Zaragoza, Spain;2. CECYEN, Univ. de Matanzas, Highway to Varadero, km 3½, 44740 Matanzas, Cuba;1. Department of Mechanical Engineering and Energy Processes, Southern Illinois University, Carbondale, IL 62901, USA;2. Advanced Coal and Energy Research Center, Southern Illinois University, Carbondale, IL 62901, USA |
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| Abstract: | Previously, we developed a model to predict lean flammability limit L and flame propagation velocity Sb for pulverized coal. In the present paper, we have extended the model to apply it in development of oxy-fuel combustion systems. The basic model consists of two particles. One of the two particles burns first, then, the other particle is ignited by the heat of combustion of the one burning particle. We analyzed at what distance the first burning particle could ignite the next particle, and how fast the first burning particle could ignite the next particle. The model was verified both for air and oxy-fuel combustion conditions. Next, a method to support burner development was examined by using the model. Local Sb and L near the ignition points of the burner could be analyzed from the concentration and temperature profiles of CFD results. Flame stability was judged by the calculated Sb and L profiles, and past results of blow-off limits obtained with actual- and pilot-scale experiments. A DS®T-burner was developed by Hitachi Power Europe, and installed at the Schwarze Pumpe pilot plant. Combination of the technique and large eddy simulation was applied to confirmation of the system. |
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