| Flue gas CFB desulfurization is a semi-dry desulfurization technology with low investment, low running costs and high sorbet utilization and desulfurization efficiency, which has wide range of applications in our country. However, flue gas CFB desulfurization without bypass has flow field defluxion, which makes a bad impaction on the condition of particles'flow; and ite biggish flow restistence impacts the condition of fans, makes the CFB desulfurization without bypass can not adapt to the change of flue gas load. Therefore, optimizing the structure of CFB tower to improve the condition of flow field and enlarge the boundary of flue gas load has significant meaning to desulphurization industry in China.A new flue gas CFB desulfurization tower with gas bypass is studied as physical model. Momentum, energy and composition equations of bypassing CFB desulfurization tower are solved by standard k-εmodel, DPM, Species Transport model and Finite-Rate Chemistry model. The results show that simulation results are agree with experimental results, and the math model can respond the condition of CFB desulfurization tower well.The influences of desulfurization tower structure, SO2 concentration, gas velocity, circulation ratio and particle size to desulfurization efficiency of bypassing desulfurization tower are also researched. The results show that:①both desulfurization efficiency and flow resistance characteristics of bypassing desulfurization tower are better than that of non-bypassing desulfurization tower;②when SO2 concentration increases, desulfurization efficiency of bypassing desulfurization tower decreases; when flue gas relative humidity in bypassing desulfurization tower increases, desulfurization efficiency increases;③when gas velocity increases, desulfurization efficiency of bypassing desulfurization tower slightly increases and then decreases;④desulfurization efficiency increases clearly when circulation rate of desulfurizing agent increases from 20 to 50, but it only has a slight increase when circulation rate is more than 50;⑤when sorbent size increases from 15μm to 300μm, desulfurization efficiency of bypassing desulfurization tower slightly decreases.
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