With the national ultra-low emission requirements, a large number of wet flue gas desulfurization has been used in the normal operation of coal-fired power plants. After long-term operation, various impurities will be enriched in the slurry of absorption tower, resulting in the reduction of desulfurization efficiency or foaming of the slurry of absorption tower, which will seriously affect the operation of the unit. It is necessary to study the influence of water quality on the desulfurization reaction of lime slurry. When the incoming water is reclaimed water, process water and filtrate respectively, the desulfurization reaction is simulated on the laboratory bench to compare its influence on the desulfurization reaction characteristics. The results show that. (1) The effect of process water on the desulfurization process is as follows. The largest amount of foaming of the desulfurization slurry and the inhibition of gypsum crystallization reaction, but the characteristics of particle size distribution in the generated gypsum slurry are most conducive to the slurry dehydration and the gypsum crystal quality is good. (2) The function of the filtrate is to minimize the foaming amount of the desulfurized slurry and the effect on the gypsum crystallization reaction. The characteristics of particle size distribution in the generated gypsum slurry are favorable for the slurry dehydration. The gypsum crystal size is the largest, but a small number of crystal particles appear at the same time, which affects the slurry dehydration to a certain extent. (3) The role of reclaimed water lies between process water and slurry.

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The paper designed and built a simulation reaction system for the Wet Flue Gas Desulfurization(WFGD) process to analyze the effects of factors on the Oxidation reaction of SO2 for the reuse of reclaimed water sludge. Six trace components including magnesium, iron, chloride, aluminum, PAM and PFS in reclaimed water sludge from reclaimed water softening were selected for analysis factors. The effects of six factors on the oxidation reaction were tested by single factor experiments. The multi-factor effects on the oxidation reaction was studied by adding different proportion of reclaimed water sludge to the desulfurizer of the simulated reaction system. In addition, the effect of reclaimed water sludge on the crystallization and dehydration of desulfurization slurry was analyzed. The results show that six factors have little effects on the SO2 oxidation rate in the test range. The addition of reclaimed water sludge has a significant effect on the crystalline form and dehydration of gypsum.

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Comparative analysis of limestone sludge in recycled water and desulfurization limestone is made in the chemical composition, reaction activity, crystallization properties and pH of Slurry. The results show that the limestone sludge in recycled water is possible to be used as a desulfurizer. Due to the large amount of impurities and lower reactivity of limestone sludge, the overall performance index values of limestone sludge are lower than that of desulphurization limestone. If it wants to be used as a desulfurizer, the further research on the using conditions of recycled water limestone sludge in desulfurization system and the possible impact of the reuse of desulfurization system on the stable operation of the system are needed.