摘要
采用大型冷模实验，结合多种现代多相流测试技术，考察了FCC提升管内催化剂和原料油的流动、混合状况。通过引入4个新参数：射流相无量纲特征浓度（反映射流的扩散速度）、颗粒密度分布均匀性指标（反映催化剂颗粒分布的均匀程度）、颗粒相返混比（反映催化剂颗粒的返混）和特征浓度剂油比（反映剂油的浓度“匹配”），定量比较了不同喷嘴出口射流速度对提升管内多相流场的影响。从优化提升管内油．剂流动、混合效果的角度出发，对进料雾化喷嘴的两个“外部矢量”进行了优化：一是喷嘴出口射流速度应控制在65～70m／s，二是采用“气体内构件”来调控提升管内流场。工业应用的效果表明，进料雾化喷嘴“外部矢量”的优化切实有效。
With large cold-run experiment and multiphase flow measuring techniques, the flow and mixing of feedstock and catalysts in FCC riser were investigated. 4 new parameters such as dimensionless jet eigenconcentration （showing jet diffusion velocity）, the uniformity index of the particle density distribution （ showing the uniformity of catalyst particle size distribution）, the particle back mixing ratio （ showing the mixing of catalyst particles） and the eigenconcentration ratio of the catalyst/oil （showing the matching of oil and catalyst） were introduced to quantitatively compare the impact of jet velocity at different nozzle outlets on the multi-phase flow field in the riser reactor. To improve the flow/mixing of feedstock and catalysts in the riser, two external vectors of feed atomizing nozzles are optimized ; The optimal jet velocity at the outlet of feed atomizing nozzles is controlled at 65-70 m/s, and the ＂gaseous internals＂ are used to control the flow field inside the riser. The commercial application indicates that the optimization of external vectors is effective.
出处
《炼油技术与工程》
CAS
2011年第4期28-33,共6页
Petroleum Refinery Engineering
