气泡大小及相对湿度对鼓泡强化膜蒸馏的影响
作者:熊玉琴,周凡,高飞,史载锋,林强
单位: 海南师范大学 化学与化工学院,海口 571158
关键词: 气液两相流;气泡大小;气泡湿度;膜蒸馏;鼓泡强化
出版年,卷(期):页码: 2016,36(2):65-69

摘要:
 采用气液两相流技术强化高浓度NaCl溶液气扫式膜蒸馏(SGMD)系统。探究连续与间歇鼓泡法、气泡大小/相对湿度对鼓气强化SGMD过程性能的影响,并对比研究了间歇鼓泡与未鼓泡SGMD过程,结果表明:间歇鼓泡比连续鼓泡更利于强化MD过程;渗透通量随气泡相对湿度增加、气泡减小而增加。料液为饱和NaCl(333 K)溶液时,鼓泡开/停组合为30 s/3 min时,气泡流速/相对湿度/大小分别为0.7 L•min-1、75%、0.22 cm时,渗透通量达2.94 L•m-2•h-1;不同于未鼓气,间歇鼓气能有效延缓SGMD过程中通量急剧下降临界点的出现,膜表面的NaCl沉积物的微观分析也证实了此结果,且使热效率增加了79.52%。
 Gas-liquid two-phase flow technology was employed to reinforce SGMD process with high-concentrated NaCl solution. The impacts of continuous & intermittent bubble method, bubble size/relative humidity on bubbling-enhanced SGMD process performance were employed. Meanwhile, the comparative study of SGMD process with intermittent bubble and no bubble was carried out. It turned out that intermittent bubble was better than continuous bubble for optimization of MD process; permeate flux increased with the increase of bubble relative humidity and the decrease of bubble size. When feed was saturated NaCl solution (333 K), bubbling on-off set was 30 s/3 min, bubble flown rate/relative humidity/size were 0.7 L•min-1, 75%, 0.22 cm respectively, permeate flux reached to 2.94 L•m-2•h-1. Relative to no bubble, intermittent bubble can delay the appearance of flux sharp flux decline in SGMD process, and NaCl deposition adherent to membrane surface have verified the above result. Moreover, thermal efficiency was improved by 79.52%.
熊玉琴(1988-),女,邵阳市人,硕士研究生,研究方向为膜蒸蒸馏海水淡化与污水处理, E-mail:1240948944@qq.com

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