首页|Simulation of gas-solid flow characteristics of the circulating fluidized bed boiler under pure-oxygen combustion conditions
Simulation of gas-solid flow characteristics of the circulating fluidized bed boiler under pure-oxygen combustion conditions
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Under the pressure of carbon neutrality, many carbon capture, utilization and storage technologies have witnessed rapid development in the recent years, including oxy-fuel combustion (OFC) technology. However, the conventional OFC technology usually depends on the flue gas recirculation system, which faces significant investment, high energy consumption, and potential low-temperature corrosion prob-lem. Considering these deficiencies, the direct utilization of pure oxygen to achieve particle fluidization and fuel combustion may reduce the overall energy consumption and CO2-capture costs. In this paper, the fundamental structure of a self-designed 130 t·h-1 pure-oxygen combustion circulating fluidized bed (CFB) boiler was provided, and the computational particle fluid dynamics method was used to analyze the gas-solid flow characteristics of this new-concept boiler under different working conditions. The results indicate that through the careful selection of design or operational parameters, such as average bed-material size and fluidization velocity, the pure-oxygen combustion CFB system can maintain the ideal fluidization state, namely significant internal and external particle circulation. Besides, the contraction section of the boiler leads to the particle backflow in the lower furnace, resulting in the particle suspension concentration near the wall region being higher than that in the center region. Conversely, the upper furnace still retains the classic core-annulus flow structure. In addition to increasing solid circulation rate by reducing the average bed-material size, altering primary gas ratio and bed inventory can also exert varying degrees of influence on the gas-solid flow characteristics of the pure-oxygen combustion CFB boiler.
Kaixuan Gao、Xiwei Ke、Bingjun Du、Zhenchuan Wang、Yan Jin、Zhong Huang、Yanhong Li、Xuemin Liu
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Key Laboratory of Special Equipment Safety and Energy-Saving for State Market Regulation, China Special Equipment Inspection &Research Institute, Beijing 100029, China
Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China
School of Electrical and Power Engineering, Taiyuan University of Technology, Taiyuan 030024, China
National Key Research and Development Program of China
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