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高密度下行床-提升管耦合反应器内的气固流动行为
引用本文:李志强,吴昌宁,魏飞,金涌. 高密度下行床-提升管耦合反应器内的气固流动行为[J]. 化工学报, 2005, 56(5): 816-822
作者姓名:李志强  吴昌宁  魏飞  金涌
作者单位:清华大学化学工程系, 北京 100084
摘    要:在新提出并建立的“下行床-提升管”耦合循环流化床装置上进行了实验研究,研究结果表明,与提高一次风率相比,提高二次风率(二次风与一、二次风之和的比值),有利于提高颗粒循环量.当颗粒循环量达到400 kg•m-2•s-1时,第一提升管出口处的固含超过了20%,此时下行床内充分发展段的固含超过了5.5%,即高浓度颗粒充满了整个循环流化床系统,并且第一提升管内的颗粒径向浓度分布趋于均匀.

关 键 词:耦合反应器  颗粒循环量  固含  提升管  下行床
文章编号:0438-1157(2005)05-0816-07
收稿时间:2004-03-26
修稿时间:2004-5-28 

High-density gas-solids flow in downer-riser coupled circulating fluidized bed
LI Zhiqiang,WU Changning,WEI Fei,JIN Yong. High-density gas-solids flow in downer-riser coupled circulating fluidized bed[J]. Journal of Chemical Industry and Engineering(China), 2005, 56(5): 816-822
Authors:LI Zhiqiang  WU Changning  WEI Fei  JIN Yong
Abstract:Experimental studies were carried out in a specially designed high-density “riser-downer-riser” coupled circulating fluidized bed system. Fluidized catalytic cracking (FCC) particles were used.Compared with the primary air rate, the secondary air rate had an important effect on the solids circulation flux. When the solids circulation flux was 400 kg•m-2•s-1, the apparent solids holdup exceeded 20% near the top of the first riser, and the volumetric solids fraction (apparent solids holdup) was larger than 5.5% in the fully developed region of the downer.With increasing solids circulation flux, more uniform solids concentration distribution along radial direction could be obtained.
Keywords:coupled reactor  solids circulation flux  solids holdup  riser  downer
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