气固超短接触反应系统中颗粒轴向及径向混合行为研究

RADIAL AND AXMLSOLIDS MIXINGIN GAS-SOLIDS QUICK CONTACT REACTOR

气固超短接触反应系统中颗粒轴向及径向混合行为研究魏飞，陈卫，金涌，俞芷青（清华大学化工系，北京１０００８４）关键词：气固超短接触反应器，磷光示踪，颗粒混合１前言气－固并流下行循环流化床反应器是一种新型气固超短接触反应器￣［１］，与传统的提升管反应器相...

Cocurrent downflow circulating fluidized bed(CDCFB)is a new type of gas一solids quickcontact reactor. Within the CDCFB of internal diameter 0.14m,a unique phosphor tracertechnique has been developed which permits the continuous determination of solid tracer concentration with time at different radial and axial positions.Solids mixing has been described byaproposed two dimensional plug flow dispersion model satisfactorily. The radial and axial dis-persion coefficients at various operating conditions have been evaluted from the experimentalresults of tracer concentration versus time. Based on these results,correlations of the radialand axial Peclet numbers with bed voidage and gas Reynolds number were proposed.