蒸汽相变促进湿法脱硫净烟气中细颗粒物的脱除  

Improving removal of fine particles from wet-process desulfurized flue gas by heterogeneous condensation

作　　者：陆斌[1] 杨林军[1] 辛成运[1] 

机构地区：[1]东南大学能源与环境学院,南京210096

出　　处：《东南大学学报（自然科学版）》2011年第1期118-123,共6页Journal of Southeast University：Natural Science Edition

基　　金：国家高技术研究发展计划(863计划)资助项目(2008AA05Z306);江苏省自然科学基金资助项目(BK2008283)

摘　　要：采用石灰石/石膏法脱硫工艺,结合蒸汽相变原理,实验考察了除雾器类型、脱硫净烟气特性、蒸汽添加量及同时在除雾器上喷低温水等对细颗粒物脱除性能的影响.结果表明:在脱硫净烟气中添加适量蒸汽,可显著提高细颗粒脱除效果,且脱除效率随蒸汽添加量增加而提高;丝网除雾器比板波纹除雾器更适于凝结长大细颗粒物的脱除;脱硫净烟气特性对细颗粒物相变脱除效果存在显著影响;由于相变室内壁面易积灰,壁面材质对细颗粒脱除效果影响不明显;添加蒸汽同时在除雾器上喷低温水可明显促进细颗粒的脱除,脱除效率可由约30%增至60%以上.The influences of demister species,characteristics of desulfurized flue gas,the addition amount of water vapor and spraying cold water above the demister on the fine particles removal were investigated in a wet limestone-based process combining heterogenous condensation of steam.The results show that removal efficiency of fine particle can be significantly improved by adding steam into the wet desulfurized flue gas.And the removal efficiency increases with the amount of steam added.The wire mesh demister is more suitable to the removal of the grown fine particles than the wave-plate demister.The characteristics of desulfurized flue gas,such as temperature,moisture content and fine particle concentration,have a remarkable influence on the removal of fine particles.Due to the adherence of fly ash to the inner wall of the condensation chamber,the influence of surface characteristics of the condensation chamber is not obvious.Additionally,the removal effect can be improved by spraying cold water above the demister while adding steam,which can make an increase of removal efficiency from about 30% to more than 60%.

关 键 词：湿法脱硫净烟气 蒸汽相变 细颗粒物 脱除 

分 类 号：X51[环境科学与工程—环境工程]