填料塔中磷酸钠缓冲溶液脱除模拟烟气中SO_2研究

Removal of sulfur dioxide from simulated flue gas by aqueous sodium phosphate in packed column

在鲍尔环填料塔中,以磷酸钠缓冲溶液为吸收剂,脱除模拟烟气中SO2,重点考察了气体流量G、液气比L/G、溶液初始pH值和磷酸浓度C L、入口气体中SO2浓度C in等参数对脱硫率的影响规律及适宜操作条件。结果表明:脱硫率随初始pH值、液气比和磷酸浓度的增加而增大;随气量增加而减小;随入口SO2浓度的增加先增加后降低,但变化较小。应用MATLAB软件对操作参数进行显著性分析,显著性由高到低依次为初始pH值、液气比、磷酸浓度、入口SO2浓度和气量。在适宜操作参数pH=5.5~6,L/G=4L/m3~5L/m3,CL=1.5mol/L^2mol/L,G=5m3/h,Cin≤12g/m3下,脱硫率达99%以上,出口SO2浓度可控制在100mg/m3以下。

Using aqueous sodium phosphate as absorbent, removal of SO2 from the simulated flue gas was studied in a column packing pall ring. The effects of gas flow rate （G）, liquid-gas volume ratio （L/G）, initial pH value and phosphate concentration （CL） of the absorbent, and concentration of SO_, in inlet gas （Cin） on SO., removal efficiency were investigated. The results showed that the desulfu6zation efficiency （7/） increased with pH value, L/G and CL, decreased with G, and increased then decreased with C~ in a small amplitude. The significant analysis on the operating parametet^s by using Matlab software indicated that the order of significance affecting the absorption of SO., is： pH 〉L/G 〉CL〉Cin 〉G. The dcsulfurization efficiency could exceed 99% and the concentration of SO2 in the outlet gas was lower than 100mg/ma under the optimized operating conditions： pH=5.5～6,L/G=4 L/m3～5L/m3,CL=1.5 mol/L～2 mol/L,G=5 m3/h and Cin≤12 g/m3.