中文摘要：

循环应用飞灰作为干法和半干法脱硫的重要添加剂，目前研究的重点主要是对作为脱硫剂的石灰／飞灰的活化．通过对半干法烟气脱硫机理的研究，设计了一套蒸汽输送、实验室脱硫系统，研究石灰／飞灰在140℃以下的低温蒸汽条件下性质的变化．采用蒸汽活化后的石灰／飞灰作为脱硫剂，对石灰／飞灰在水蒸气输送半干法脱硫工艺中对脱硫效率的影响进行了研究和分析．试验结果表明，石灰在蒸汽条件下其中的CaO转化为Ca（OH）2，同时，脱硫剂的比表面积由7．8688m^2／g增加到10．0715m^2／g．脱硫剂中加入循环应用飞灰可以明显地提高脱硫效率，在石灰和飞灰加入量的重量比为1：8时，脱硫效率达到86．9％．SO2的去除率比不加飞灰的脱硫效率提高了12．8％．研究表明，通过蒸汽对石灰和循环应用脱硫剂活化可明显提高脱硫效率．

英文摘要：

Recycled fly ash is considered as SO2 removal agent, most study focus on activating of SO2 sorbents. It is reported that reacting efficient increases in the presence of steam in dry and semidry flue gas desulhpurization （FGD）. With study of mechanism of semi-dry FGD, a full set of laboratory FGD system was established, in which SO2 sorbent were activated by steam with temperature below 180℃ during conveyance, and the pressure of about 0. 4 MPa, characteristics of SO2 sorbent of various ratio of lime/fly ash. Experiments were conducted by means of mixture with three types of lime/fly ash ratio as SO2 sorbents, testing results showed that during steam conveyance,part of CaO of SO2 sorbent transformed into Ca （OH） 2, and specific surface area increased from 7.8688m^2/g to 10. 0715m^2/g. It is well accepted that enhanced SO2 sorbent with fly ash greatly improve desulphurization efficiency. Study showed that SO2 removal efficiency of 86. 9% achieved, with lime to fly ash ratio of 1 ： 8 （ wt/wt）, which increased 12. 8% over with lime as SO2 sorbent only. Test results shows that SO2 sorbent activated by steam has a significant effect on reactivity of SO2 removal efficiency.