CFD Simulation of Propane Cracking Tube Using Detailed Radical Kinetic Mechanism

doi:10.1016/S1004-9541(13)60619-9

Chinese Journal of Chemical Engineering ›› 2013, Vol. 21 ›› Issue (12): 1319-1331.DOI: 10.1016/S1004-9541(13)60619-9

• 流体力学与传递现象 • 下一篇

CFD Simulation of Propane Cracking Tube Using Detailed Radical Kinetic Mechanism

张楠, 邱彤, 陈丙珍

Institute of Process Systems Engineering, Tsinghua University, Beijing 100080, China

收稿日期:2012-05-22 修回日期:2013-05-24 出版日期:2013-12-28 发布日期:2013-12-27
通讯作者: CHEN Bingzhen
基金资助:
Supported by the National Science &；Technology Supporting Plan (2012BAF05B00) and the National Basic Research Program (2012CB720500).

CFD Simulation of Propane Cracking Tube Using Detailed Radical Kinetic Mechanism

ZHANG Nan, QIU Tong, CHEN Bingzhen

Institute of Process Systems Engineering, Tsinghua University, Beijing 100080, China

Received:2012-05-22 Revised:2013-05-24 Online:2013-12-28 Published:2013-12-27
Supported by:
Supported by the National Science &；Technology Supporting Plan (2012BAF05B00) and the National Basic Research Program (2012CB720500).

摘要/Abstract

摘要： In the radiant section of cracking furnace, the thermal cracking process is highly coupled with turbulent flow, heat transfer and mass transfer. In this paper, a three-dimensional simulation of propane pyrolysis reactor tube is performed based on a detailed kinetic radical cracking scheme, combined with a comprehensive rigorous computational fluid dynamics (CFD) model. The eddy-dissipation-concept (EDC) model is introduced to deal with turbulence-chemistry interaction of cracking gas, especially for the multi-step radical kinetics. Considering the high aspect ratio and severe gradient phenomenon, numerical strategies such as grid resolution and refinement, stepping method and relaxation technique at different levels are employed to accelerate convergence. Large scale of radial nonuniformity in the vicinity of the tube wall is investigated. Spatial distributions of each radical reaction rate are first studied, and made it possible to identify the dominant elementary reactions. Additionally, a series of operating conditions including the feedstock feed rate, wall temperature profile and heat flux profile towards the reactor tubes are investigated. The obtained results can be used as scientific guide for further technical retrofit and operation optimization aiming at high conversion and selectivity of pyrolysis process.

关键词: numerical simulation, cracking tube, computational fluid dynamics (CFD), detailed radical kinetics

Abstract: In the radiant section of cracking furnace, the thermal cracking process is highly coupled with turbulent flow, heat transfer and mass transfer. In this paper, a three-dimensional simulation of propane pyrolysis reactor tube is performed based on a detailed kinetic radical cracking scheme, combined with a comprehensive rigorous computational fluid dynamics (CFD) model. The eddy-dissipation-concept (EDC) model is introduced to deal with turbulence-chemistry interaction of cracking gas, especially for the multi-step radical kinetics. Considering the high aspect ratio and severe gradient phenomenon, numerical strategies such as grid resolution and refinement, stepping method and relaxation technique at different levels are employed to accelerate convergence. Large scale of radial nonuniformity in the vicinity of the tube wall is investigated. Spatial distributions of each radical reaction rate are first studied, and made it possible to identify the dominant elementary reactions. Additionally, a series of operating conditions including the feedstock feed rate, wall temperature profile and heat flux profile towards the reactor tubes are investigated. The obtained results can be used as scientific guide for further technical retrofit and operation optimization aiming at high conversion and selectivity of pyrolysis process.

Key words: numerical simulation, cracking tube, computational fluid dynamics (CFD), detailed radical kinetics

张楠, 邱彤, 陈丙珍. CFD Simulation of Propane Cracking Tube Using Detailed Radical Kinetic Mechanism[J]. Chinese Journal of Chemical Engineering, 2013, 21(12): 1319-1331.

ZHANG Nan, QIU Tong, CHEN Bingzhen. CFD Simulation of Propane Cracking Tube Using Detailed Radical Kinetic Mechanism[J]. Chin.J.Chem.Eng., 2013, 21(12): 1319-1331.

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CFD Simulation of Propane Cracking Tube Using Detailed Radical Kinetic Mechanism

CFD Simulation of Propane Cracking Tube Using Detailed Radical Kinetic Mechanism

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