摘要
采用RNG k-ε湍流模型,结合欧拉双流体模型对不同入口结构的超短接触旋流反应器内的气固两相流场进行数值模拟,考察混合腔内气相流动特点及固相浓度分布。计算结果表明:斜向下进气结构由于存在较大区域的颗粒屏蔽死区并且各部位浓度梯度较大,不适合用做反应器入口结构型式。切向水平进气和斜向上进气结构混合腔内的气固混合效果较好,但切向水平进气结构易发生入口颗粒滞留以及混合腔顶灰环现象,斜向上进气结构混合腔内速度较小,不易实现超短接触操作要求。
By using turbulence model RNG k-ε, combined with multi-fluid Eulerian model, two-phase flow field of quick-con- tact cyclone reactor with the different inlet structures was simulated. The gas flow characteristics and volume fraction of solid in the mixing cavity were researched. The results show that the second reactor （ inclined down inlet） has a wide area in which nearly no particles exist and the unevenness degree is higher than any other structure, so this type of reactor should be given up. The gas solid mixing effect of the other two structures is better, but they also have defects. The first reactor （horizontal tangential inlet） is more likely to detain particles from going into mixing cavity and cause a dust ring at the top of mixing cav- ity. The velocity in the mixing cavity of the third reactor （inclined up inlet） is small,so it＇s difficult to achieve quick-contact operation.
出处
《中国石油大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2012年第5期169-174,共6页
Journal of China University of Petroleum(Edition of Natural Science)
基金
中国石油大学重质油国家重点实验室开放基金项目
中国石油科技创新基金项目(W1003003)
中国石油大学研究生创新基金项目(CXZD11-12)
关键词
超短接触旋流反应器
气固两相
入口结构
混合腔
数值模拟
quick-contact cyclone reactor
gas-solid two phase
inlet structure
mixing cavity
numerical simulation
