Investigation on lateral dispersion characteristics of fuel particles in dense phase zone of a large-scale circulating fluidized bed boiler under combustion conditions |
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| Affiliation: | 1. Key Laboratory of Low-grade Energy Utilization Technologies and Systems (Chongqing University), Ministry of Education, Chongqing, 400044, China;2. Dongfang Boiler Group Co., Ltd, Chengdu, 611731, China;3. Geely Baikuang Group Co., Ltd, Guangxi, 533000, China;1. International Center for Ecology, Meteorology, and Environment, School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing, 210044, China;2. Department of Atmospheric Sciences, School of Earth Sciences, Zhejiang University, Hangzhou, 310027, China;3. Beijing Capital Air Environmental Science & Technology Co, Ltd, Beijing, 100176, China;4. Huangshi Meteorological Bureau of Hubei Province, Huangshi, 435000, China;5. College of Ecology and Environment, Hainan University, Haikou, 570228, China;1. State Key Laboratory of Molecular Vaccinology and Molecular Diagnostics, National Institute of Diagnostics and Vaccine Development in Infectious Diseases, School of Life Sciences, School of Public Health, Xiamen University, Xiamen, 361102, China;2. Center for Molecular Imaging and Translational Medicine, School of Public Health, Xiamen University, Xiamen, 361102, China;1. School of Pharmacy, Jilin Medical University, Jilin, 132013, Jilin Province, China;2. College of Life Science, Jilin University, Changchun, 130012, Jilin Province, China;3. Department of Pharmaceutics, School of Pharmaceutical Science, Peking University, Beijing, 100191, China;4. College of Pharmaceutical Sciences, Yanbian University, Yanji, 133002, Jilin Province, China;1. School of Geography and the Environment, Liaocheng University, Liaocheng, 252000, China;2. Key Laboratory of Geographic Information Science of the Ministry of Education, School of Geographic Sciences, East China Normal University, Shanghai, 200241, China |
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| Abstract: | The dispersion characteristics of fuel particles in the dense phase zone in circulating fluidized bed (CFB) boilers have an important influence on bed temperature distribution and pollutant emissions. However, previous research in literature was mostly on small-scale apparatus, whose results could not be applied directly to large-scale CFB with multiple dispersion sources. To help solve this problem, we proposed a novel method to estimate the lateral dispersion coefficient (Dx) of fuel particles under partial coal cut-off condition in a 350 MW supercritical CFB boiler based on combustion and dispersion models. Meanwhile, we carried out experiments to obtain the Dx in the range of 0.1218–0.1406 m2/s. Numerical simulations were performed and the influence of operating conditions and furnace structure on fuel dispersion characteristics was investigated, the simulation value of Dx was validated against experimental data. Results revealed that the distribution of bed temperature caused by the fuel dispersion was mainly formed by char combustion. Because of the presence of intermediate water-cooled partition wall, the mixing and dispersion of fuel and bed material particles between the left and right sides of the furnace were hindered, increasing the non-uniformity of the bed temperature near furnace front wall. |
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| Keywords: | Dispersion Large-scale CFB Fuel particles Combustion Dense phase zone |
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