蒸汽相变促进湿法脱硫净烟气中细颗粒物的脱除.pdf

第4l卷第1期东南大学学报(自然科学版)Vo1．41No．1
2011年1月JOURNALOFSOUTHEASTUNIVERSITY(NamrMScienceEdition)Jan．2011

doi：10．3969／j．issn．1001—0505．2011．01．023

蒸汽相变促进湿法脱硫净烟气中细颗粒物的脱除

陆斌杨林军辛成运

(东南大学能源与环境学院，南京210096)

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．
关键词：湿法脱硫净烟气；蒸汽相变；细颗粒物；脱除
中图分类号：X51文献标志码：A文章编号：1001—0505(2011)01-0118-06

Improvingremovaloffineparticlesfromwet·processdesulfurized
fluegasbyheterOgene0uscondensation

LuBinYangLinjunXinChengyun

(SchoolofEnergyandEnvironment，SoutheastUniversity，Nanjing210096，China)

Abstract：Theinfluencesofdemisterspecies，characteristicsofdesulfurizedfluegas，theadditiona-
mountofwatervat’orandsprayingcoldwaterabovethedemisteronthefineparticlesremovalwere
investigatedinawet1imestone—basedprocesscombiningheterogenouscondensationofsteam．The
resultsshowthatremovaleficiencyoffineparticlecanbesignificantlyimprovedbyaddingsteamin-
tothewetdesulfurizedfluegas．Andtheremovalefficiencyincreaseswiththeamountofsteamadd-
ed．ThewiremeshdemisteriSmoresuitabletotheremovalofthegrownfineparticlesthanthe

wave．platedemister．Thecharacteristicsofdesulfurizedfluegas，suchastemperature，moisturecon-
tentandfineparticleconcentration．havearemarkableinfluenceontheremovaloffineparticles．
DuetotheadherenceofflyashtotheinnerWal1ofthecondensationchamber．theinfluenceofsur-
facecharacteristicsofthecondensationchamberisnotobvious．Additionally，theremovaleffectcan
beimprovedbysprayingcoldwaterabovethedemisterwhileaddingsteam．whichcanmakeanin—
creaseofremovalefficiencyfromabout30％tomorethan60％．
Keywords：wetdesulfurizedfluegas；heterogeneouscondensation；fineparticles；removal

可吸人颗粒物(PM。。)特别是细颗粒物器前设置预处理设施，使其通过物理或化学作用长
(PM，)污染已成为突出的大气环境问题．现大成较大颗粒后加以脱除．其中，利用过饱和水汽
有除尘技术虽已达到较高水平，但仍难以有效捕集在细颗粒物表面的核化凝结特性是促使细颗粒物
PM，燃煤是引起我国大气环境中PM含量增加长大的重要措施，已有较多报道“，但将蒸汽相
的主要原因，控制燃煤电厂PM排放是亟待解决变技术与湿法脱硫净烟