CATEGORY: FCC – FLUID CATALYTIC CRACKING
Chemical Engineering Journal, Available online
26 February 2013, In Press, Accepted Manuscript
Evaluating the role of intraparticle mass and
heat transfers in a commercial FCC riser: A meso-scale study
Guo-Qiang Chen a, Zheng-Hong Luo a, b, Xing-Ying
Lan c, Chun-Ming Xu c, Jin-Sen Gao c
a Department of Chemical and Biochemical Engineering, College of Chemistry and
Chemical Engineering, Xiamen University, Xiamen 361005, P. R. China
b Department of Chemical Engineering, College of Chemistry and Chemical
Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China
c State Key Laboratory of Heavy Oil Processing, China University of Petroleum,
Changping, Beijing 102249, P. R. China
Abstract
Offers new insights into the fundamental
mechanism of catalytic cracking from the meso-scale viewpoint. Researchers
examined intraparticle mass and heat transfers under fluid catalytic cracking
(FCC) reaction conditions. They constructed a comprehensive single particle
model to characterize detailed chemical and physical phenomena occurring within
catalyst particles in a commercial FCC riser from an industrial-scale refinery.
The model integrates the mass, energy, and
momentum balances as well as the equations for gas-state, lumped-species
reaction kinetics, the multicomponent diffusion and convective heat transfer.
It is able to predict temperature, pressure, species mass fraction
distributions, as well as the reaction rate and the effective diffusivity
coefficient within the particles as a function of catalyst position in the
riser. A detailed study based on the validated model shows that there are three
typical particle phenomena along the axial direction in the FCC riser. This leads to different catalytic and
reactive operating zones under simultaneous mass and heat transfers as well as
reaction.
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