氧化锌吸收-空气氧化法烟气脱硫实验研究

Experimental research on simulated flue gas desulfurization by ZnO slurry absorption and wet air oxidation

采用次氧化锌配制成的悬浮浆液脱除吸收模拟烟气中的SO2,吸收产物亚硫酸锌浆液再通过鼓风湿式氧化成硫酸锌溶液,以验证氧化锌吸收空气氧化法烟气脱硫的效果。通过改变气体流量、SO2浓度、浆液温度及pH值等工艺参数,探索吸收和氧化过程的最佳控制条件。结果表明,氧化锌浆液对含SO2浓度从5800～8600mg/m3的烟气脱除效率均可达到90%以上,吸收容量为39gSO2/15g次氧化锌;氧化过程控制吸收终点浆液pH值为50以及浆液温度在38℃,氧化率可达95%。

ZnO slurry was used to remove SO_2 from simulated flue gas, and ZnSO_3 slurry, the production of absorption, was oxided to ZnSO_4 by pumping air to the solution. By changing the gas flow rate, SO_2 content, the temperature and pH value of the slurry during the experiment, the optimum conditions of absorption and oxidation were investigated. The results showed that the sulfur removal rate was above 90% for various SO_2 content range from 5800 mg/m3 to 8600 mg/m3 and the capacity of absorption was 3.9 g SO_2 per 15 g absorbents and the oxidation rate was about 95% under pH value of 5.0 and temperature of 38 ℃ respectively.