欢迎访问过程工程学报, 今天是

›› 2007, Vol. 7 ›› Issue (3): 445-450.

• 流动与传递 • 上一篇    下一篇

液固提升管-流化床组合反应器中流化床径向固含率分布的实验研究

聂向锋,卢春喜,马安,龙文宇,时铭显   

  1. 中国石油大学（北京）重质加工国家重点实验室
  • 出版日期:2007-06-20 发布日期:2007-06-20

Experimental Study on the Solid Hold-up in the Fluidized Bed of a Riser-Fluidized Bed Combined Reactor

NIE Xiang-feng,LU Chun-xi,MA An,LONG Wen-zi,SHI Ming-xian   

  1. State Key Laboratory of Heavy Oil, China University of Petroleum (Beijing)
  • Online:2007-06-20 Published:2007-06-20

PDF

摘要： 在一套新型液固提升管-流化床组合反应器中，以水-玻璃珠为液-固体系，对f500 mm′4000 mm的液固流化床反应器内不同高度颗粒固含率的径向分布进行了实验，考察了表观液速和颗粒循环速率操作条件对颗粒固含率径向分布的影响. 实验表明，液固流化床内流动区域在轴向上可以划分为分布器影响区、过渡区和均匀流化区，径向上可以划分为中心区和环隙区. 这种分布特征主要取决于分布器的结构、尺寸及其流化介质. 本工作还对液固流化床与气固喷动床的三区流动结构进行了比较.

关键词: 液-固流化床, 径向固含率, 流动区域, 表观液速, 颗粒循环速率

Abstract: The radial distributions of solid hold-up are investigated in a cold model of a new type of liquid-solid fluidized bed reactor with 500 mm ID and 4000 mm in height of a riser-fluidized bed combined reactor. The influences of superficial liquid velocity and solids circulating rate on the radial hold-up distribution are also analyzed respectively, focusing on the most probably influential factors. The experimental results show that the whole bed can be divided into three distinct axial zones, distributor influencing zone, gradually developed zone and steadily fluidized zone. At the same time, in these three zones, the cross-sections of the liquid-solid fluidized bed can be characterized by two areas in radial direction, the central and annual areas. Moreover, the three-zone flow features of the liquid-solid fluidized bed and the spouted bed are also compared in detail.

Key words: liquid-solid fluidized bed, radial solid hold-up, flow regime, superficial liquid velocity, solids circulating rate