氯化钾异相硫化机理的试验研究

Mechanism Investigation on the Heterogeneous Sulfation of Potassium Chloride

生物质燃烧释放的碱金属氯化物蒸气会在受热面上冷凝,并在烟气中SO_2/O_2/水蒸汽等共同作用下发生异相硫化反应,从而影响碱金属对受热面的腐蚀。本文利用固定床反应器研究了反应温度、停留时间、氯化物及SO_2/O_2/H_2O等浓度等对固相KCl硫化的影响,实验结果表明:KCl非均相硫化的主要产物是K_2SO_4,在O_2和H_2O较低是KCl异相硫化较慢,KCl异相硫化速率随SO_2/O_2和H_2O浓度增大而提高,随停留时间的延长呈线性递增,并随反应温度的升高呈指数关系升高。

Alkali metal chloride vapor released from biomass combustion will condense on the heating surface,and react with gases like SO_2,H_2O,and O_2 in the flue gas,which can relieve the corrosion of alkali metal on the heating surface.Aiming at the heterogeneous sulfation of KCl,fixed bed is used to investigate the influence of sulfation temperature,residence time and the concentration of SO_2,O_2,H_2O on the sulfation of KCl.Results show that the sulfation rate of KCl increases with the concentration of SO_2,O_2,and H_2O.And it increases linearly with residence time,and increases exponentially with sulfation temperature.