Abstract Mass transfer between the phases is a cornerstone of many technological processes and presents a topic whose understanding and modelling is of high importance. For instance, absorption of gases in liquid droplets is an underlying phenomenon for the desulfurization of flue gases in wet scrubbers. Wet scrubbing is an efficient cleaning method where the liquid is sprayed in a stream of rising gases, removing pollutants due to the concentration difference between the gas phase and droplets. A model for absorption in water droplets has been developed to describe the complex physical and chemical interactions during the exposure to flue gases. The main factors affecting the absorption are the mass transfer of pollutants through the gas–droplet interface and the aqueous phase chemistry in a droplet. The mass transfer coefficient, which has been modeled with several approaches, is the most significant parameter regulating the absorption dynamic into the droplet, while the in-droplet chemistry controls the maximum quantity of dissolved pollutants. Dissociation of sulfur dioxide and the chemical reactions in seawater have been described by the equilibrium reactions. Afterward, the influence of the mass transfer coefficient has been investigated, and the model has been validated against the literature data on a single droplet scale. Obtained results are comparable with the experimental measurements and indicate the applicability of the model for the design and development of industrial scrubbers.

中文翻译：

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水滴中二氧化硫吸收的数值分析

摘要 相间的传质是许多技术过程的基石，是理解和建模非常重要的课题。例如，气体在液滴中的吸收是湿式洗涤器中烟道气脱硫的潜在现象。湿法洗涤是一种有效的清洁方法，其中液体喷洒在上升的气体流中，去除由于气相和液滴之间的浓度差异而产生的污染物。已经开发了一种水滴吸收模型来描述暴露于烟道气过程中复杂的物理和化学相互作用。影响吸收的主要因素是污染物通过气体-液滴界面的传质和液滴中的水相化学。传质系数，已用多种方法建模，是调节液滴吸收动态的最重要参数，而液滴内化学物质控制溶解污染物的最大数量。二氧化硫的离解和海水中的化学反应已经用平衡反应来描述。随后，研究了传质系数的影响，并在单液滴尺度上根据文献数据对模型进行了验证。获得的结果与实验测量结果具有可比性，表明该模型适用于工业洗涤器的设计和开发。而液滴内化学控制溶解污染物的最大数量。二氧化硫的离解和海水中的化学反应已经用平衡反应来描述。然后，研究了传质系数的影响，并在单液滴尺度上根据文献数据对模型进行了验证。获得的结果与实验测量结果具有可比性，表明该模型适用于工业洗涤器的设计和开发。而液滴内化学控制溶解污染物的最大数量。二氧化硫的离解和海水中的化学反应已经用平衡反应来描述。然后，研究了传质系数的影响，并在单液滴尺度上根据文献数据对模型进行了验证。获得的结果与实验测量结果具有可比性，表明该模型适用于工业洗涤器的设计和开发。