钠碱脱硫废液电渗析再生机理

Principle of sodium alkali FGD with electrodialysis recycling

通过电渗析再生钠碱脱硫废液的试验和模型推导，研究了电渗析再生钠碱脱硫废液机理．结果表明：电渗析再生钠碱脱硫废液过程中，理论渗析率与实际渗析率相差较小，且随着电流密度的增大。硫的理论渗析率与实际渗析率都明显增大，硫的渗析率可以根据阴极进、出口溶液pH值进行计算．试验结果与模型具有较好的匹配性。模型可以较好地反映渗析效果．硫的理论渗析率应小于50％，在pH值为6．0～7．5的范围内，硫的渗析率上升速率较快，当pH值〈6．0或〉7．5时。硫的渗析率变化速率较慢，且在一定pH值范围内模型有较好的稳定性．

Electrodialysis recycling principle of sodium alkali flue gas with anion-exchange membrane and model deduction. Results show desulfurization （FGD） was studied that in the process of sodium alkali FGD with anion exchange membrane electrodialysis recycling, theoretical and practical sulfur electrodialysis ratio were almost the same and increased with the level of current density. Sulfur electrodialysis ratio could be calculated according to the pH of cathode influent and effluent solution. The model was in good agreement with the experiment results and reflected the electrodialysis effect well. Sulfur electrodialysis ratio should be less than 50% and it would increase quickly at pH=6.0-7.5 and increase slowly at pH〈6.0 or pH〉7.5. The model had good stability in the stated range of influent solution pH.