湿法烟气脱硫系统气_气换热器堵塞机理分析.pdf

第31卷第1期动力工程学报Vol.31No.1
2011年1月JournalofChineseSocietyofPowerEngineeringJan.2011

文章编号:16747607(2011)01005305中图分类号:X701.3文献标识码:A学科分类号:470.30

湿法烟气脱硫系统气气换热器堵塞机理分析

肖海平1,张千2,孙保民1
(1.华北电力大学电站设备状态监测与控制教育部重点实验室,北京102206;
2.神华国华(北京)电力研究院有限公司,北京100069)

摘要:研究了湿法烟气脱硫系统气气换热器(GGH)堵塞的机理,用X射线衍射仪分析了GGH
结垢物的物相组成,测量了脱硫系统除雾器入口烟气流速、出口烟气携带的小液滴浓度以及除雾器

叶片的除雾效率.结果表明:垢的主要成分为石膏和CaSO4,飞灰参与了垢的形成过程;除雾器后净
烟气携带的浆液粒径主要分布在10~30m;随着气流速度的加快,除雾效率呈现先提高后降低的
趋势;当烟气流速高于8m/s后,除雾器出现严重的二次携带,除雾效率急剧下降;除雾器入口烟气
流速分布不均,整体流速偏高,整体除雾效率为68.67%;净烟气从脱硫塔携带出的脱硫浆液是造
成堵塞的主要物质,除雾器脱除效率偏低,使得小粒径的脱硫浆液流经除雾器进入GGH,造成
堵塞.
关键词:湿法烟气脱硫;气气换热器;除雾器;除雾效率;结垢;堵塞机理

AnalysisonBlockageMechanismofGasGasHeater
inWetFlueGasDesulfurizationSystems

XIAOHaiping1,ZHANGQian2,SUNBaomin1
(1.KeyLaboratoryofConditionMonitoringandControlforPowerPlantEquipment,Ministryof
Education,NorthChinaElectricPowerUniversity,Beijing102206,China;2.ShenhuaGuohua
(Beijing)ElectricPowerResearchInstituteCo.,Ltd.,Beijing100069,China)

Abstract:Tostudytheblockagemechanismofgasgasheater(GGH)inawetfluegasdesulfurizationsys
tem,phasecompositionofscalesonGGHwasanalyzedbyXraydiffraction,whilevelocityofdemisterin
letfluegasandconcentrationofdropletcarriedbytheoutletfluegasmeasuredaswellasthedemistingef

ficiencydeduced.ResultsshowthatCaSO42H2OandCaSO4arethemaincomponentsofthescaleand
thescalingprocessinvolvestheflyash.Inthepurifiedfluegas,thesizedistributionofdropletmainlylies
in10to30m.Thedemistingefficiencyfirstincreasesandthendecreaseswithrisinggasvelocity.When
thegasvelocitygetsabove8m/s,dropletreentrainmentwilloccur,resultinginseriouslylowereddemist
ingefficiency.Theoveralldemistingefficiencycanreachonly68.67%duetopoordistributionandhigh
valueofinletgasvelocity.TheblockageofGGHmainlyattributestothelowdemistingefficiency,which
allowsthesmalldropletsfromdesulfurizationprocessintoGGH.
Keywords:wetfluegasdesulfurization;gasgasheater;demister;demistingefficiency;scaling;blockage
mechanism

收稿日期:20100621
基金项目:中央高校基本科研业务费专项资金资助项目(09Z