摘要
在新型液-固循环移动床反应-再生冷模装置中,以水-玻璃珠为液-固体系,对φ300 mm×3000 mm的液-固循环移动床再生器内的操作域和流动特性进行了研究。实验结果表明,下料管出口和料位高度的相对位置对床层流动状态有较大影响,当料位高度高于下料管出口高度时,床层流动可以分为局部流化床区和移动床区两个区域。随着表观再生液速的增大,移动床区先后经历了移动床流动和散式流化床流动,移动床流动的操作液速为0～6.5 mm/s,散式流化床流动的操作液速为6.5～20.5 mm/s。随着表观再生液速的增大,移动床层各轴向高度颗粒平均速率均增大,表观再生液速超过一定值后,颗粒平均速率基本不变。在各轴向高度床层上,随着表观再生液速的增大,局部流化床区周向影响区中心夹角不断增大。
The operation regime and flow characteristics of a new type of liquid-solid circulating moving bed were investigated in a cold model with a φ300 mm × 3 000 mm regenerator. The experimental results showed that the flowing state in the bed varied significantly with the relative positions between the particle returning pipe outlet and the static bed surface. The whole bed could be divided into local fluidized bed and moving bed when the static bed surface was higher than that of the particle returning pipe outlet. With the superficial recovering-liquid velocity increasing, the moving bed went through moving flow and incipient fluidization flow in sequence. The superficial recovering-liquid velocity of the moving bed flow was 0 ～ 6. 5 mm/s, while the superficial recovering-liquid velocity of the incipient fluidization flow was 6.5～20.5 mm/s. With the superficial recovering-liquid velocity increasing, the average axial particle velocity of the moving bed increased and changed slightly when the superficial recovering-liquid velocity was above some certain value. The circumferential influence area angle of the intensively-fluidized bed The influences of the superficial recovering-liquid velocity was on the pressure-drop and average axial particle velocity of moving bed as well as circumferential influence area of the circumferential with the superficial recovering-liquid velocity. angle of local fluidized bed zone was became bigger
出处
《化学反应工程与工艺》
CAS
CSCD
北大核心
2007年第1期35-41,共7页
Chemical Reaction Engineering and Technology
关键词
液-固循环移动床
操作区域
床层压降
颗粒速率
liquid-solid circulating moving bed
operation regime
pressure-drop
particle velocity
