稳定性二氧化氯脱硫技术研究

Study on removal of SO_2 by stabilized chlorine dioxide

采用稳定性二氧化氯溶液为氧化吸收液,在填料塔中进行了气液逆流吸收操作,以盐酸副玫瑰苯胺分光光度法作为分析手段,研究了各操作因素对SO2去除率的影响。结果表明,当填料高度大于20 cm、二氧化氯质量浓度为0.6 g/L、pH为3.47、液气比为46.668时,SO2去除率达到99.95%以上;各操作因素中,二氧化氯的浓度对SO2去除率影响最为显著,当其质量浓度从1.0 g/L降低到0.2 g/L时,SO2去除率从99.97%降低到99.91%;SO2去除率受吸收液的pH、填料高度和液气比的影响较小。氧化吸收后的产物主要含HC l和H2SO4,易于回收。

With the stabilized chlorine dioxide solution as oxidation absorbent, the absorption of gas-liquid countercurrent operation is run in the packed tower. With spectrophotometry of pararosaniline hydrochloride as the analytical tool, the various operating factors on the SO2 removal rate are studied. The results show that when the packing height is more than 20 cm, the concentration of chlorine dioxide is about 0. 6 g/L, pH value is 3.47, the ratio of liquid to gas is 46. 668, the removal efficiency of sulfur dioxide could achieve more than 99. 95% ; Under the experimental conditions, the concentration of chlorine dioxide plays the most significant influence on the removal efficiency of sulfur dioxide,which would decrease to 99.91% from 99. 97% when its concentration decreases to 0. 2 g/L from 1.0 g/L;The sulfur dioxide removal efficiency is less affected by the pH value of absorption solution ,packing height and the liquid to gas ratio. The products after oxidized and absorbed include HC1 and H2SO4 mainly ,which can be recovered easily.