醇胺溶液催化法碳捕集的能耗评估及动力学分析

Energy Consumption Assessment and Reaction Kinetics Analysis of Catalytic Amine-based Carbon Capture Technology

为了缓解醇胺溶液碳捕集的高能耗问题,加入了纳米级羟基氧化铝作为催化剂以有效降低再生能耗。基于传热学基本理论,将解吸过程分为升温阶段和恒温阶段,建立了分阶段的能耗评估模型,获得了实时热负荷变化曲线。该模型比传统的能耗评估方法更精确,更容易确定能耗最低的操作条件。利用该模型,探究了催化和无催化条件下再生热负荷最低的解吸温度,结果表明:在适中的解吸温度下再生能耗最低。此外,分析了解吸过程的总包反应动力学,发现反应级数模型最适合描述乙醇胺溶液再生反应速率,该模型的动力学参数证明了催化剂通过降低反应活化能的方式节省再生能耗。

In order to alleviate the extensive energy consumption of amine-based carbon capture,nanoscale aluminum oxyhydroxide was applied as the catalyst to reduce the heat duty of amine regeneration.The desorption process was divided into a heating-up stage and an isothermal stage based on the basic heat transfer theory.An energy consumption assessment model for calculating the heat input during different stages was established,and the real-time heat duty variation curves were obtained.This model was more precise than conventional methods,and was beneficial for determining the optimal operation conditions to reach the lowest energy consumption.Based on this method,the best desorption temperatures to achieve the lowest heat duty with and without catalyst were investigated.Results show that moderate temperatures can bring the lowest energy consumption.Besides,through the analysis of the overall reaction kinetics during the regeneration process,it is found that the reaction order model is most suitable for describing the reaction rate of ethanolamine solution.The parameters of the reaction order model prove that the catalyst saves the energy consumption of regeneration by reducing the activation energy of the desorption reaction.