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Fast Evolution of Sulfuric Acid Aerosol Activated by External Fields for Enhanced Emission Control.
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-02-11 , DOI: 10.1021/acs.est.9b06191 Zhengda Yang 1, 2 , Chenghang Zheng 1 , Qingyi Li 3 , Hao Zheng 1 , Haitao Zhao 1 , Xiang Gao 1
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2020-02-11 , DOI: 10.1021/acs.est.9b06191 Zhengda Yang 1, 2 , Chenghang Zheng 1 , Qingyi Li 3 , Hao Zheng 1 , Haitao Zhao 1 , Xiang Gao 1
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Sulfuric acid aerosol (SAA) can considerably deteriorate air visibility, which poses a threat to human health. Pretreatment methods that enlarge SAA sizes are crucial to enhanced emission control from industrials. This study provides an insight into SAA growth in terms of aerosol dynamics simulation and growth experiments under simulated flue gas conditions. Results show that SAA growth dynamics are dominated by coagulation and condensation mechanisms for small and large aerosols, respectively. The two mechanisms are coupled mainly in SAA sizes smaller than 0.05 μm. A large amount of time was allotted for the SAA distribution to grow into an approximately log-normal form without the use of any activation methods. Cooling gas and corona discharge can both enhance SAA growth. Cooling gas is in charge of condensation, whereas corona discharge mainly acts on coagulation. They exhibited 14.3% and 12.3% increases in mean diameter and 12.3% and 69.1% decreases in number concentration. In contrast, adding vapor led to a 1.58% decrease in mean diameter and a 9.4% increase in number concentration. Findings suggest that combining cooling gas and corona discharge to simultaneously promote coagulation and condensation and reduce SAA emission from humid flue gas is possible.
中文翻译：
外场活化的硫酸气溶胶的快速释放，可增强排放控制能力。
硫酸气溶胶（SAA）会大大降低空气能见度，从而对人类健康构成威胁。扩大SAA尺寸的预处理方法对于增强工业排放控制至关重要。这项研究通过模拟烟气条件下的气溶胶动力学模拟和生长实验，对SAA的生长提供了见识。结果表明，SAA的生长动力学主要受小型和大型气溶胶的凝结和凝结机理影响。这两种机制主要以小于0.05μm的SAA尺寸耦合。在不使用任何激活方法的情况下，分配了大量的时间使SAA分布增长为近似对数正态形式。冷却气体和电晕放电都可以促进SAA的生长。冷却气体负责冷凝，而电晕放电主要作用于凝结。它们的平均直径显示出14.3％和12.3％的增幅，数均浓度下降了12.3％和69.1％。相反，添加蒸气导致平均直径降低1.58％，数量浓度增加9.4％。研究结果表明，结合冷却气体和电晕放电以同时促进凝结和冷凝并减少湿烟道气中SAA的排放是可能的。
更新日期：2020-02-24
中文翻译：
外场活化的硫酸气溶胶的快速释放，可增强排放控制能力。
硫酸气溶胶（SAA）会大大降低空气能见度，从而对人类健康构成威胁。扩大SAA尺寸的预处理方法对于增强工业排放控制至关重要。这项研究通过模拟烟气条件下的气溶胶动力学模拟和生长实验，对SAA的生长提供了见识。结果表明，SAA的生长动力学主要受小型和大型气溶胶的凝结和凝结机理影响。这两种机制主要以小于0.05μm的SAA尺寸耦合。在不使用任何激活方法的情况下，分配了大量的时间使SAA分布增长为近似对数正态形式。冷却气体和电晕放电都可以促进SAA的生长。冷却气体负责冷凝，而电晕放电主要作用于凝结。它们的平均直径显示出14.3％和12.3％的增幅，数均浓度下降了12.3％和69.1％。相反，添加蒸气导致平均直径降低1.58％，数量浓度增加9.4％。研究结果表明，结合冷却气体和电晕放电以同时促进凝结和冷凝并减少湿烟道气中SAA的排放是可能的。
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