Abstract: In order to improve the efficiency of flue gas desulphurization (FGD), the spray drying wet (semi-dry) process was experimentally investigated on a home (self-designed) experimental platform. The factors influencing desulphurization efficiency, such as the number of nozzles, the kinds of desulfurizers and additives, were examined. The results indicated that the desulphurization efficiency can be greatly improved by increasing the stages of nozzles i.e. the efficiency achieves the maximum when the slurry proportion by primary and secondary nozzle 60% : 40%, and is 15.2% higher for two-stage slurry-supply system than for single-stage system in the same condition. The decrease of flue temperature and SO₂ removal take mainly place in slurry atomization region. Furthermore, addition of additives can also enhance desulphurization efficiency, and the efficiency increases linearly with additive concentration at lower than 0.8 g·L^-1, and NaOH is more effective than NaCl.

Key words: flue gas desulfurization, desulfurization efficiency, additive, semi-dry

摘要： 为提高半干法烟气脱硫效率，通过改变喷嘴级数、脱硫剂类型和增加添加剂等，在自主设计和搭建的热态实验平台上，对半干法烟气脱硫进行了实验研究。结果表明：增加喷嘴级数可有效提高脱硫效率；双级系统脱硫效率在一、二级喷嘴供浆量各占60%和40%时达到最高，比相同工况下单级系统可提高15.2%；烟气温降和SO₂脱除主要发生在浆液雾化区；增加添加剂能有效地提高系统的脱硫效率，添加剂浓度小于0.8 g·L^-1时，脱硫效率随其浓度呈线性增加，作为添加剂NaOH较NaCl效果更为明显。

关键词: 烟气脱硫, 脱硫效率, 添加剂, 半干法