半干半湿法烟气脱硫技术及其数值模拟研究

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1、北京工业大学博士学位论文半干半湿法烟气脱硫技术及其数值模拟研究姓名：林军申请学位级别：博士专业：环境工程指导教师：钟儒刚;李坚20060901北京工业大学工学博士学位论文来预测脱硫效率。研究结果显示数值模拟的结果和实测的结果差别较小，表明该两相流模型理论和分析方法适用于对半干半湿法脱硫技术的研究。通过采用两相流模拟的方法，分析反应源相模型中S02浓度、脱硫剂颗粒的浓度和反应时间可计算S02的脱除率，确定脱硫塔体的最优化设计。本研究结果首次利用CFD方法分析脱硫塔体内部喷嘴出口雾羽扩散角度，烟气分布器后烟气的速度流场和

2、压力场分布，来指导喷嘴在脱硫塔内分布和烟气分布器设计。通过气固两相流模型和颗粒群轨道模型分析烟气中SCh的去除率，为优化塔体提供了理论基础，研究成果为脱硫技术的国产化和国内技术大型化提供了技术依据。关键词(3-5个)：半干半湿法，烟气脱硫，脱硫，脱硫塔流场ⅡABSTRACTThisdissertationfocusesonanalysisofanewapproachofsemi—drydesulphurizationtechnology，thedemonstratingprojectofwhichhasbeencon

3、structedona35t／hcoalfiredboiler．BasedontheanalysisofthemechanismofS02removalprocess，theflowpattemandpressurefieldinsidetheS02removalreactorhavebeensimulatedandanalyzed；inaddition，theinnerstructureoftheS02absorberhasbeenoptimizedandthedesulprhurizationefficiency

4、hasbeenpredicted．Theanalysisresultsprovidetheoreticalandtechnologicalsupportsforsemi—drydesulphurizationprocess．Reactingfluegastemperature,CaO／S02molarratio，watercontent(orhumidity)andtheratioofrecycleofflyashtoCaOarethekeyoperatingfactors，whichrelatethedesulph

5、urizationefficiencygreatly．Regardingthesefactors，themechanismandtransformationofS02sorbentsduringthesteamconveyancehasbeendiscnssad,masstnmsferandexperimentalconditionduringthetransportationhavealsobeenstudied．Experimentalresultsshow廿l砒thesurfacestructureofS02s

6、orbentshasbeenchanged．Itisimportanttoadjnsthumidityandtemperaturetothemostsuitablefors02removalprocess．thuscanimprovethefluegasdesulphm'izationefficiency．Bysprayingw撕intefluegas,waterfilmisformed011thesurfaceandinnerporesoftheS02sorbents，andfinally，mostwaterdro

7、pletsareevaporated,andthefluegastemperatureisthendecreasedanditshumidityisincreased．Thisc觚helptoswitch旭∞tiI培processfromgas-solidtogas-liquid-solid,whichquickentheproceadmgendincreasethereactingefficiencyapparently．Dudnlngthesprayprocess,mostwaterdropletsevapora

8、teandtherestodesmeettheparticlesofS02sofbents．mass订ansfbfandhcattransferoccl】rOllthesurfaceandinnerporesofthesorbent，andfinallyevaporationappearwithinthedusulphurizationreac