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Numerical Model to Analyze the Physicochemical Mechanisms Involved in CO2 Absorption by an Aqueous Ammonia Droplet

机译:分析氨水水溶液中涉及CO2吸收的物理化学机制的数值模型

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摘要

CO2 is the main anthropogenic greenhouse gas and its reduction plays a decisive role in reducing global climate change. As a CO2 elimination method, the present work is based on chemical absorption using aqueous ammonia as solvent. A CFD (computational fluid dynamics) model was developed to study CO2 capture in a single droplet. The objective was to identify the main mechanisms responsible for CO2 absorption, such as diffusion, solubility, convection, chemical dissociation, and evaporation. The proposed CFD model takes into consideration the fluid motion inside and outside the droplet. It was found that diffusion prevails over convection, especially for small droplets. Chemical reactions increase the absorption by up to 472.7% in comparison with physical absorption alone, and evaporation reduces the absorption up to 41.9% for the parameters studied in the present work.
机译:二氧化碳是主要的人为温室气体,其减少在减少全球气候变化方面发挥着决定性作用。作为二氧化碳消除方法,本作本作基于使用氨水作为溶剂的化学吸收。开发了CFD(计算流体动力学)模型以研究单液滴中的CO2捕获。目的是鉴定负责二氧化碳吸收的主要机制,例如扩散,溶解度,对流,化学解离和蒸发。所提出的CFD模型考虑了液滴内外的流体运动。发现扩散在对流中占据了对流,特别是对于小型液滴。与单独的物理吸收相比,化学反应增加高达472.7%,并且蒸发降低了本工作中研究的参数的吸收至41.9%。

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