脱硫脱硝后V2O5/AC在含NH3气氛中的再生及硫资源化的耦合过程研究  

A coupled NH_3-regeneration and sulfur recovery process for V_2O_5/AC used in simultaneous removal of SO_2 and NO in flue gas

作　　者：郭彦霞[1] 刘振宇[1] 王建成[1] 邢新艳[1] 雷智平[1] 

机构地区：[1]中国科学院山西煤炭化学研究所煤转化国家重点实验室

出　　处：《燃料化学学报》2008年第1期36-41,共6页Journal of Fuel Chemistry and Technology

基　　金：国家自然科学基金重点项目(20736001,20503038)

摘　　要：V2O5/AC具有很好的烟气同时脱硫脱硝能力,脱硫过程包括其对烟气中SO2的吸附、吸附饱和后SO2从其上的脱附(再生)及脱附出SO2的资源化。考察了同时脱硫脱硝后的V2O5/AC在含NH3气氛中的再生和硫资源化的耦合过程。研究了NH3注入量、再生温度、再生时间和尾气循环流量对再生效率、硫回收率及二次脱硫脱硝活性的影响。结果表明,再生温度和再生时间主要影响SO2的脱附,因而影响再生效率和二次脱硫脱硝活性;NH3注入量不影响SO2的脱附,但明显影响硫回收率和二次脱硫脱硝活性;尾气循环模式是提高硫回收率的重要方法,但在研究的条件下循环流量对再生效率、硫回收率和二次脱硫脱硝活性的影响不大。Activated coke （AC） supported V2O5 （V2O5/AC） is very effective for simultaneous removal of SO2 and NO from flue gas at around 200 ℃. The SO2 removal is accomplished by oxidation of SO2 into SO3 and then formation of sulfuric acid storing within the pores of AC. Regeneration of the used V2O5/AC is important for continuous operation. It can be achieved in the presence of NH3 at temperatures lower than that required by AC under an inert atmosphere. SO2 desorbed from the used V2O5/AC can be recovered to solid ammonium-sulfur salts through reactions between SO2 and NH3 upon cooling of the regeneration effluent to temperatures below 80 ℃. Coupling of the regeneration and the ammonium-sulfur salts formation processes by recycling the effluent gas back to the regeneration reactor make the regeneration and sulfur recovery very efficient. This work studies the effect of regeneration conditions on desorption of SO2, recovery of sulfur, and SO2 and NO removal activities in the subsequent operation. Regeneration conditions tested include the amounts of NH3 been injected, regeneration temperature, regeneration time and the recycle rates of the effluent gas. The results show that the regeneration temperature and time affect the desorption of SO2 and subsequent SO2 and NO removal activities. Amounts of NH3 injected affect sulfur recovery and SO2 and NO removal activities, but recycle rate of the effluent gas has little effect on all these parameters.

关 键 词：V2O5/AC 再生 NH3 硫回收 

分 类 号：X511[环境科学与工程—环境工程]