Use of a numerical model to evaluate SO2 absorption efficiency by sodium sulfite in packed and spray columns.

IF 2.5 4区 环境科学与生态学 Q3 ENGINEERING, ENVIRONMENTAL
Water Science and Technology Pub Date : 2025-04-01 Epub Date: 2025-04-03 DOI:10.2166/wst.2025.049
Rodolphe Vautherin, Hélène Métivier, Anne Reguer, Hassen Benbelkacem
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引用次数: 0

Abstract

Numerical modeling has been used extensively to simulate gas-liquid transfer of sulfur dioxide, assessing how operational parameters affect absorption efficiency in packed or spray columns. Despite individual studies on these contactors, comparative analyses on the same flue gas have been rare. This study uses a numerical model for both packed and spray columns to examine how parameters influence SO2 absorption by sodium sulfite, describing packed and spray columns, is used to investigate the influence of operational parameters on SO2 absorption by sodium sulfite. The model's predictions are validated against experimental data from an industrial pilot plant. Across varying conditions (L/G ratio, temperature, initial SO2 content or initial S(IV) concentration), the packed column achieves higher absorption efficiencies compared to the spray column, with lower assumed energy costs due to a reduced L/G ratio. Temperature proves to be a significant factor, decreasing absorption efficiency by approximately 40% between 40 and 70 °C. SO2 absorption efficiency declines with increasing concentrations of bisulfite and sulfite ions in the absorption solution, dropping to 50% at an S(IV) concentration of 2 kmol m-3 in the liquid phase. Considering the objective of producing a concentrated bisulfite solution and a clean gas, a two-column system is recommended: one for bisulfite solution concentration at acidic pH and the other for gas purification enhancement at basic pH.

用数值模型评价了亚硫酸钠在填料塔和喷雾塔中对二氧化硫的吸收效率。
数值模拟已广泛用于模拟二氧化硫的气液转移,评估操作参数如何影响填料或喷雾塔的吸收效率。尽管对这些接触器进行了个别研究,但对同一烟气的比较分析很少。本研究采用填料塔和喷雾塔的数值模型来研究参数对亚硫酸钠吸收二氧化硫的影响,描述填料塔和喷雾塔,用于研究操作参数对亚硫酸钠吸收二氧化硫的影响。该模型的预测与工业中试工厂的实验数据进行了验证。在不同的条件下(L/G比、温度、初始SO2含量或初始S(IV)浓度),填料柱与喷雾柱相比具有更高的吸收效率,由于L/G比降低,假设的能量成本更低。温度被证明是一个重要的因素,在40到70°C之间,吸收效率降低了大约40%。随着亚硫酸盐和亚硫酸盐离子浓度的增加,吸收溶液中SO2的吸收效率下降,在液相中S(IV)浓度为2 kmol m-3时,吸收效率降至50%。考虑到生产亚硫酸氢盐浓溶液和洁净气体的目标,建议采用双柱系统:一柱用于酸性亚硫酸氢盐溶液的浓缩,另一柱用于碱性条件下气体的净化强化。
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来源期刊
Water Science and Technology
Water Science and Technology 环境科学-工程:环境
CiteScore
4.90
自引率
3.70%
发文量
366
审稿时长
4.4 months
期刊介绍: Water Science and Technology publishes peer-reviewed papers on all aspects of the science and technology of water and wastewater. Papers are selected by a rigorous peer review procedure with the aim of rapid and wide dissemination of research results, development and application of new techniques, and related managerial and policy issues. Scientists, engineers, consultants, managers and policy-makers will find this journal essential as a permanent record of progress of research activities and their practical applications.
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