逆向气体射流对下行床颗粒混合的影响Solids Axial and Radial Mixing Behavior in Downer with Gas Jet in Reverse Direction
刘会娥,杨艳辉,魏飞,金涌
摘要(Abstract)：
下行床入口结构的研究一直被人们所重视。今在内径为0.192m的下行床中颗粒达到均匀分布的部位,沿床四周均布了三个45度方向逆流场气体射流入口,在此处设立气体入口可以使颗粒分散与气固快速接触不再同时进行。采用磷光颗粒示踪技术对下行床有逆流场射流气体存在时颗粒的轴径向混合行为进行了研究。这种逆流场射流气体对下行床颗粒的轴向混合行为无明显影响,在各操作条件下下行床内颗粒均能以接近平推流的方式运动;但该射流气体可以大大加强颗粒的径向混合,有利于气固接触,在下行床颗粒径向混合越差的操作条件下,射流气体对颗粒径向混合的影响效果越明显。下行床的这种入口结构具有良好的应用前景。
关键词(KeyWords)： 下行床;逆流场;气体射流;入口;颗粒;轴径向混合
基金项目(Foundation):
作者(Author): 刘会娥,杨艳辉,魏飞,金涌
参考文献(References)：
- [1]WEI Fei(魏飞),ZHU Jing-xu(祝京旭).Cocurrent gas-solids downflow fluidized bed reactors(III).Gas and solid mixng(气固下行流化床反应器-III气固混合)[J].ChemicalReactionEngineering andTechnology(化学反应工程与工艺),1996,12(4):429-437.
- [2]WEI Fei(魏飞),LIU Jin-zhong(刘金忠),JIN Yong(金涌).Hydrodynamics and mixing behavior in entrance of downer(下行床入口段流体力学及混合行为)[J].J ChemIndEng(Chian)(化工学报),1998,49(1):28-38.
- [3]LehnerP,WirthK.Effects of the gas/solids distributor on the local and overall solids distribution in a downer reactor[J].TheCanadianJournal ofChemicalEngineering,1999,77:199-206.
- [4]ZhuJ X,MaY,ZhangH.Gas-solids contact efficiency in the entrance region of a co-current downflow fluidized bed[J].TransIChE,1999,77,PartA:151-158.
- [5]WEI Fei(魏飞),JIN Yong(金涌),YU Zhi-qing(俞芷青),GAN Jun(甘俊),WANG Zhan-wen(汪展文).Application of phosphor tracer technique to the measurement of solidsRTD in circulating fluidized bed(磷光颗粒示踪技术在循环流态化中的应用)[J].J ChemIndEng(China)(化工学报),1994,45(2):230-235.
- [6]WEI Fei(魏飞),CHEN Wei(陈卫),JIN Yong(金涌),YU Zhi-qing(俞芷青).Solids residence time distribution in aCFB riser(循环流化床提升管中固体颗粒停留时间的分布)[J].J ChemEng ofChineseUniv(高校化学工程学报),1996,10(3):264-270.
- [7]WEI Fei(魏飞),JIN Yong(金涌),YU Zhi-qing(俞芷青).Effect of flow direction on the solids mixing in the riser and downer ofCFBs(流动方向对循环流化床中颗粒混合行为的影响)[J].EngineeringChemistry andMetallurgy(化工冶金),1997,18(2):129-136.
- [8]WeiF,WangZ,JinY, et al.Dispersion of lateral and axial solids in a cocurrent downflow circulating fluidized bed[J].PowderTechnology,1994,81:25-30.