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DYNAMIC MODEL FOR A VAPOR RECOVERY IN CARBOTHERMIC ALUMINUM PROCESS

机译:碳铝热过程中蒸气回收的动态模型

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摘要

As a result of the high temperatures present in a Carbothermic Aluminum Process the content of aluminum and aluminum sub-oxide in the gases leaving this process is high. These gases as well as energy must be recovered. In a Vapor Recovery Unit were the aluminum compounds react in a series of Heterogeneous Non-catalytic Reactions forming solid, liquid and gas products. The different product phases depend on the temperature present in the system. In this work we present dynamic model of the Vapor Recovery Unit of a conceptual Carbothermic Aluminum Process. Because of the complexity of the system several models are developed and coupled to capture the essential physics of the multiphase reaction problem. A Shrinking Core Model describes the reaction mechanisms. Then material and energy balances are coupled with the thermodynamics properties from the FACT database of thermodynamic properties, resulting in a system of nonlinear Partial Differential Equations. In the paper we describe the model development and governing equations for the reaction mechanisms and fluid flow. Finally we review the numerical schemes created for the solution of the model system. The model can be used for control and design purposes.
机译:由于碳热铝工艺中存在高温,离开该工艺的气体中铝和次氧化铝的含量很高。必须回收这些气体以及能量。在蒸气回收装置中,铝化合物以一系列非均相非催化反应进行反应,形成固体,液体和气体产物。不同的产品阶段取决于系统中存在的温度。在这项工作中,我们介绍了概念性碳热铝工艺的蒸汽回收装置的动态模型。由于系统的复杂性,开发并耦合了多个模型以捕获多相反应问题的基本物理原理。收缩核心模型描述了反应机理。然后,将材料和能量平衡与FACT热力学性质数据库中的热力学性质进行耦合,从而形成非线性偏微分方程组。在本文中,我们描述了反应机理和流体流动的模型开发和控制方程。最后,我们回顾为模型系统求解创建的数值方案。该模型可用于控制和设计目的。

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