Sensitivity of Carbon Anode Baking Model Outputs to Kinetic Parameters Describing Pitch Pyrolysis

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• 作者：Fran莽ois Gr茅goire ; Louis Gosselin ; Houshang Alamdari
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2013
• 出版时间：March 27, 2013
• 年：2013
• 卷：52
• 期：12
• 页码：4465-4474
• 全文大小：413K
• 年卷期：v.52,no.12(March 27, 2013)
• ISSN：1520-5045

文摘

Carbon anode blocks, used in aluminum electrolysis cells, are usually baked in furnaces for several days, during which they release volatiles due to pitch pyrolysis. Therefore, numerical modeling of anode baking furnaces has to include some representation of pitch pyrolysis via a set of kinetic parameters. These kinetic parameters can vary with raw materials and baking parameters and are tedious to determine experimentally. In this work, we studied how the main outputs of an anode baking model are affected by the variance of the kinetic parameters. Results show that certain model outputs are not considerably influenced by changes in the kinetic parameters (e.g., spatial variation of anode porosity, maximum heating value from volatiles), while others are significantly affected (e.g., time evolution of anode porosity, time of maximum heating value of volatiles, internal pressure of anode), in particular by activation energy variability.