李兵¹,魏文韫¹,刘凌岭¹,杨兴灿¹,余徽¹,朱家骅¹,WilhelmHoeflinger²

• 1:四川大学 化学工程学院，四川 成都 610065
• 2:维也纳技术大学 化学工程研究所，奥地利 维也纳 1060

摘要(Abstract)：

采用光散射法测量湿法除尘系统的气相颗粒浓度与粒度分布时，测量结果易受颗粒吸湿、凝雾以及雾沫夹带等影响。为准确测量气溶胶浓度，需对采样气流进行稀释以降低相对湿度，促使液滴蒸发。基于液滴蒸发动力学方程，研究了液滴蒸发时间与液滴粒径、混合气温度、相对湿度和液滴浓度的关系。结果表明，在液滴温度20℃、气相温度20~40℃及液滴浓度不大于2×10⁴ P·cm^-3时，出口气相相对湿度不高于15.7%时，粒径0.2~5 μm的水滴均可在稀释器内完全蒸发。研究得到了不同气相温、湿度及液滴浓度下的临界蒸发操作条件。以5 μm液滴为例，气相温度为20℃，气相相对湿度为18%时，临界蒸发液滴数浓度为104 P·cm^-3。实验表明加载稀释器时在临界蒸发操作条件下测得的颗粒物粒径分布与真实粒径分布吻合良好。

关键词(KeyWords)： 气溶胶;粒度分布;湿法除尘系统;稀释器;蒸发

Abstract:

Keywords:

基金项目(Foundation): 国家国际科技合作专项资助（2014DFG92250）；国家自然科学基金（21276161）。

作者(Author): 李兵¹,魏文韫¹,刘凌岭¹,杨兴灿¹,余徽¹,朱家骅¹,WilhelmHoeflinger²

DOI: 10.3969/j.issn.1003-9015.2016.00.038

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