Simulation of the decoking of an ethane cracker with a steam/air mixture

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• 作者：G.J. Heynderickx ; E.M. Schools and G.B. Marin
• 关键词：Steam cracking ; Decoking combustion kinetics ; Decoking gasification kinetics ; Reaction/diffusion model ; Decoking time ; Industrial units
• 刊名：Chemical Engineering Science
• 出版年：2006
• 出版时间：March 2006
• 年：2006
• 卷：61
• 期：6
• 页码：1779-1789
• 全文大小：510 K

文摘

A combined furnace and reactor calculation is performed for the simulation of the decoking of an ethane cracker with a steam/air mixture. Different gas–solid reaction/diffusion models with a corresponding texture model describing the solid phase changes during the decoking operation are combined with kinetics for the decoking by combustion and gasification, determined based on experimental data [Heynderickx, G.J., Schools, E.M., Marin, G.B., 2005. Coke combustion and gasification kinetics in ethane steam crackers. A.I.Ch.E. Journal 51 (5), 1414–1428]. By comparing the calculated coil outlet temperatures and the calculated partial pressures of carbon dioxide at the coil outlet with the measured values in an industrial unit, the need for a general gas–solid reaction/diffusion model and the corresponding decoking kinetics is confirmed. The decoking time for an industrial unit is simulated adequately.