采用压力脉动信号分析法对三相流化床流型划分的研究

Transition of Flow Patterns in A Three Phase Fluidized Bed

本文采用床层压力脉动信号的计算机在线分析方法进行了并流三相流化床流型转变过程的研究.为了查明操作条件(气速、液速)和颗粒物性(密度、粒径)对转变过程的影响,进行了一系列的实验工作.最后得到在空气-水-颗粒的三相流化体系内,从气泡合并区向气泡分散区转变的判别式:在R_(eg)p_(?)/p_l·(D_T/d_p)^(-1.589)·Fr_g^(-0.1)≥1.01×10~5条件下如果Re_(lc)(U_(mf)^(?)/U_(mf)^(＇＇))^(0.388)·Re_U_(mf)^(?)^(-0.461)·((p_(?)-p_l)/p_l)^(-0.478)≥13.4则流化床处于分散区操作,反之,则处于合并区操作状态.

An investigation of the transition of flow patterns in a cocurrent three phase fluidized bed has been conducted by using on-line computer analysis of pressure fluctuation. A series of experiments were performed to study the effect of density and particle size, as well as operating conditions on the transition process. A correlation was obtained for the transition from coalesced bubble flow regime to dispersed bubble flow regime in a water-air-particle fluidized system If Reg For dispersed bubble flnw regme For coalesced bubble flow regime