A practical countercurrent fluid catalytic cracking regenerator model for in situ operation optimization

AIChE Journal, Early View (Online Version of Record published before inclusion in an issue)

A practical countercurrent fluid catalytic cracking regenerator model for in situ operation optimization

Yongmin Zhang 1, Chunxi Lu 1,*, Tingwen 2

lcx725@sina.com

1 State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, P.R. China

2 URS Corp., Morgantown, WV 26505

Abstract

Proposed here is a practical countercurrent fluid catalytic cracking (FCC) regenerator model with improved descriptions of gas and solid flow patterns.

A three-zone and two-phase gas model was utilized to describe the gas flow through the regenerator, addressing the different phase mass-transfer properties in the different zones. A new two-continuously stirred-tank reactor-with-interchange model was used to describe the solid flow and to address the effect of freeboard on catalyst regeneration.  After fitting a single model parameter, the interchange solid flux between the dense bed and freeboard, the model predictions were in reasonable agreement with the commercial data for both modes

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