Computational investigation of hydrodynamics and cracking reaction in a heavy oil riser reactor--颗粒学报PARTICUOLOGY

Chang, J., Zhang, K., Meng, F., Wang, L., & Wei, X. (2012). Computational investigation of hydrodynamics and cracking reaction in a heavy oil riser reactor. Particuology, 10(2), 184–195. https://doi.org/10.1016/j.partic.2011.09.010

Computational investigation of hydrodynamics and cracking reaction in a heavy oil riser reactor

Jian Chang ^a, Kai Zhang ^a *, Fandong Meng ^b, Longyan Wang ^b, Xiaoli Wei ^c

a State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China
b Luoyang Petrochemical Engineering Corporation, SINOPEC, Luoyang 471003, China
c Sixth Community of Zhongyuan Oilfield Company, SINOPEC, Puyang 475300, China

10.1016/j.partic.2011.09.010

Volume 10, Issue 2, April 2012, Pages 184-195

Received 31 July 2011, Revised 26 September 2011, Accepted 27 September 2011, Available online 18 February 2012.

E-mail: kzhang@ncepu.edu.cn

Highlights

► A three-phase CFD model is developed to investigate hydrodynamics, heat transfer and cracking reaction in a heavy oil riser.

► Hydrodynamics, temperature and species concentration exhibit significantly nonuniform behavior in the riser.

► New operating mode is superior to the conventional fluid catalytic cracking process.

Abstract

This paper presents a computational investigation of hydrodynamics, heat transfer and cracking reaction in a heavy oil riser operated in a novel operating mode of low temperature contact and high catalyst-to-oil ratio. Through incorporating feedstock vaporization and a 12-lump cracking kinetics model, a validated gas–solid flow model has been extended to the analysis of the hydrodynamic and reaction behavior in an industrial riser. The results indicate that the hydrodynamics, temperature and species concentration exhibit significantly nonuniform behavior inside the riser, especially in the atomization nozzle region. The lump concentration profiles along the riser height provide useful information for riser optimization. Compared to conventional fluid catalytic cracking (FCC) process, feedstock conversion and gasoline yield are respectively increased by 1.9 units and 1.0 unit in the new FCC process, the yield of liquefied petroleum gas is increased by about 1.0 unit while dry gas yield is reduced by about 0.3 unit.

Graphical abstract

Keywords

Hydrodynamics; Cracking reaction; Riser; CFD; Low temperature contact; High catalyst-to-oil ratio

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