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化工学报  2014 

浓海水鼓泡过程中的气泡行为

DOI: 10.3969/j.issn.0438-1157.2014.08.019, PP. 2981-2987

Keywords: 鼓泡,蒸发,传质,浓海水,晒盐

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Abstract:

鼓泡操作可强化浓海水蒸发过程,其气泡的大小及运动行为对浓海水蒸发过程有显著影响。实验通过搭建两种不同尺寸的鼓泡池,针对单鼓泡口、双鼓泡口及鼓泡阵列,在不同气量、鼓泡口深度与鼓泡口间距条件下,考察大气泡群与小气泡群在不同运动过程的行为。结果表明,在气体流量更低的情况下,液面上的小气泡群比大气泡群具有更高的表面覆盖度,更易于增加液相扰动,并能迸射出更多的小液滴,提出小气泡更适合于鼓泡浓缩晒盐过程。通过单因素实验优化后,小气泡群的覆盖率可以达到90%,蒸发速率可比传统滩晒过程增加1~1.5倍。优化后操作参数为:单鼓泡口气流量为0.4L·min-1、鼓泡口深度为8cm、鼓泡口间距为12cm。

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