Numerical simulation of flue gas desulfurization characteristics in CFB with bypass ducts |
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| Authors: | Qiang Tang Qin Wang Pengfei Cui Weiwei Cao Shifeng Hou |
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| Institution: | 1. Department of Chemical Engineering, École Polytechnique de Montréal, Montreal, QC, Canada;2. Chemical Reactor Engineering Centre (CREC), Department of Chemical and Biochemical Engineering, University of Western Ontario, London, ON, Canada;3. Department of Computer Science, University of Saskatchewan, Saskatoon, SK, Canada;1. School of Chemical Engineering, Northwest University, Xi'' an, China;2. School of Chemical Engineering and Technology, Xi''an Jiaotong University, Xi''an, China |
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| Abstract: | A new process of flue gas desulfurization in circulating fluidized bed with flue gas bypass ducts is presented. k–? Model, Discrete Phase Model and Finite-Rate Chemistry Model are proposed to simulate the desulfurization process characteristics in circulating fluidized bed reactor. The proposed model is validated by the comparison of experimental data and simulation results. The results show that the desulfurization reactor with bypass ducts is superior to the reactor without bypass ducts. The reactor with bypass ducts has higher desulfurization efficiencies and lower flow resistances than the reactor without bypass ducts, and it is more suitable for flue gas flow variation. Desulfurization reaction rate is controlled by absorption reaction on sorbent particles surface. When water content and Ca/S ratio increase, desulfurization efficiency of the reactor with bypass ducts increases. When SO2 concentration increases, desulfurization efficiency decreases. |
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