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Type: Journal article
Title: Concentration profile of jet gas in the feed injection zone of a FCC riser
Author: E, C.
Fan, Y.
Zhang, K.
Zhang, H.
Citation: Progress in Natural Science, 2008; 18(10):1285-1291
Publisher: Taylor & Francis Ltd
Issue Date: 2008
ISSN: 1002-0071
Statement of
Chenglin E, Yiping Fan, Kai Zhang and Hu Zhang
Abstract: 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 M-shaped 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 Mj/Mr between 0.29 and 0.54, respectively.
Keywords: FCC riser; Feed injection zone; Jet gas concentration; Momentum ratio
RMID: 0020093516
DOI: 10.1016/j.pnsc.2008.01.038
Appears in Collections:Chemical Engineering publications

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