Concentration profile of jet gas in the feed injection zone of a FCC riser  

作　　者：Chenglin E Yiping Fan Kai Zhang Hu Zhang 

机构地区：[1]State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China [2]Institute of Science and Technology in Medicine, Keele University Medical School, Thornburrow Drive, Hartshill, ST4 7QB, UK

出　　处：《Progress in Natural Science:Materials International》2008年第10期1285-1291,共7页自然科学进展·国际材料（英文版）

基　　金：supported by National Natural Science Foundation of China (Grant Nos.20576076 and 20476057).

摘　　要：The concentration profiles of jet gas are investigated in the feed injection zone of a cold-model FCC riser by using a hydrogen trace technique. Experimental results demonstrate that four types of jet gas concentration profiles can be used to describe the mixing between the jet gas and pre-lift gas in the feed injection zone. The four types are a distinct M-shaped profile for weak mixing, an indistinct Mshaped profile for medium mixing, a sharp profile for strong mixing, and a parabolic profile for full mixing. The heights for regions of initial and full mixing reduce when decreasing the jet gas velocity or increasing the pre-lift gas velocity. Furthermore, the momentum ratio, Mj/Mr, （where Mj is the momentum of jet gas, Mr is the mixture momentum of pre-lift gas and solid particles） is introduced to describe the effects of gas-solid physical properties, operating conditions, and equipment configuration on the jet gas concentration distribution. The heights for regions of initial and full mixing between jet gas and pre-lift gas are found to be 0-0.375 and 0.375 0.675 m when Mj/Mr 〈 0.29.0.375 0.675 and 1.075 1.375 m when Mj/Mr 〉 0.54, and 0-0.375 and 0.675 1.075 m when MJMr between 0.29 and 0.54, respectively.喷气气体的集中侧面被使用一种氢踪迹技术在一个冷模型的 FCC 起床人的 feed 注射地区调查。试验性的结果表明喷气气体集中侧面的四种类型能被用来描述在喷气气体之间混合并且预先提起在 feed 注射地区的气体。四种类型是为弱混合，为完整的混合的为中等混合的模糊塑造 M 的侧面，为强壮的混合的锋利的侧面，和抛物线的侧面的不同塑造 M 的侧面。为起始、完整的混合还原剂的区域的高度当减少时喷气气体速度或增加预先提起气体速度。而且，动量比率， Mj/Mr，(在 Mj 是喷气气体的动量的地方，先生是混合动量预先提起煤气、稳固的粒子) 被介绍在喷气气体集中分发上描述煤气的稳固的物理性质，操作条件，和设备配置的效果。为区域的高度起始、完整在喷气气体之间混合并且预先提起气体被发现当时，是 0 0.375 和 0.375 0.675 m Mj/Mr < 0.29 ， 0.375 0.675 和 1.075 1.375 m 什么时候 Mj/Mr > 0.54 ，和 0 0.375 和 0.675 1.075 m 什么时候在 0.29 和 0.54 之间的 Mj/Mr ，分别地。

关 键 词：FCC riser Feed injection zone Jet gas concentration Momentum ratio 

分 类 号：TE96[石油与天然气工程—石油机械设备]