液相生化法烟气脱硫机理及动力学

Mechanism and Kinetics of Wet Biochemical Fuel Gas Desulfurization

试验研究pH、Fe3+浓度、SO2浓度和温度对液相生化法烟气脱硫反应动力学的影响.结果表明:Fe3+浓度是整个脱硫过程中最关键的影响因素,Fe3+浓度为0—0.01mol/L时,脱硫效率随Fe3+浓度的增加而增加,继续增加Fe3+浓度,脱硫效率没有明显变化;pH在1.5—3.5范围内,脱硫效率随H+浓度的升高而降低;SO2浓度在1145—2232mg/m3范围内,脱硫效率随SO2浓度的增加而降低;温度在20℃—35℃范围内,脱硫效率随温度升高而升高.同时,在推理液相生化法烟气脱硫机理的基础上,建立了Fe3+浓度变化的动力学方程,用动力学方程计算的Fe3+浓度很好地和试验值吻合.

Effect of pH,concentration of Fe3＋ and SO2,and temperature on the kinetics of wet bacteria flue gas desulfurization（WB-FGD）was experimentally studied.The results showed that concentrations of Fe3＋ were key factor in the WB-FGD process.The desulfurization efficiency increased with increasing concentrations of Fe3＋ within the range of 0—0.01mol/L,and it was unchanged significantly at higher concentrations of Fe3＋.The desulfurization efficiency decreased with increasing concentration of H＋ when the pH ranges from 1.5 to 3.5,and with increasing concentration of SO2 within the range of 1145—2232mg/m3.While desulfurization efficiency increases with increasing temperature ranging between 20℃ and 35℃.At the same time,the kinetics equation for concentrations of Fe3＋ was established based on the reasoning mechanism of WB-FGD,and the theoretical values of concentrations of Fe3＋ calculated by means of this equation are in good agreement with experimental data.