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›› 2008, Vol. 8 ›› Issue (3): 444-448.

• 流动与传递 • 上一篇    下一篇

半椭圆管盘式涡轮搅拌桨气-液分散特性

张新年 刘新卫 包雨云 高正明   

  1. 北京化工大学化学工程学院 北京化工大学机电工程学院 北京化工大学 北京化工大学化学工程学院
  • 收稿日期:2008-01-28 修回日期:2008-04-01 出版日期:2008-06-20 发布日期:2008-06-20
  • 通讯作者: 包雨云

Gas-Liquid Dispersion by Hollow-blade Disk Turbines

ZHANG Xin-nian LIU Xin-wei BAO Yu-yun GAO Zheng-ming   

  1. Beijing University of Chemical Technology College of Chemical Engineering, Beijing University of Chemical Technology
  • Received:2008-01-28 Revised:2008-04-01 Online:2008-06-20 Published:2008-06-20
  • Contact: BAO Yu-yun

摘要: 在直径为0.476 m的椭圆底搅拌槽中,采用半椭圆管盘式涡轮桨,研究桨径与槽径比D/T变化(分别为0.28, 0.33, 0.4及0.5)对气液两相体系中临界分散、通气功率和气含率的影响. 结果表明,对于D/T较小的搅拌桨,采用由载气到气泛测得的泛点比气泛到载气测得的泛点明显滞后,但随D/T增大泛点滞后现象消失;在相同通气量下,D/T对相对功率需求(Pg/P0)的影响不大;功率消耗相同时,低通气量时气含率随D/T增大略有增大,但高通气量时恰好相反. 研究结果及泛点、通气功率、气含率关联式对工业气液搅拌反应器设计操作具有参考价值.

关键词: 搅拌槽, 半椭圆管盘式涡轮桨, 气泛, 通气功率, 气含率

Abstract: The influences of impeller diameter (0.28T, 0.33T, 0.40T and 0.5T) on critical impeller speed for gas dispersion, gassed power consumption and gas holdup were studied in a 0.476 m i.d. stirred tank with dished base agitated by a hollow-blade disk turbine. The results show that the flooding transitions measured from loading to flooding (L-F) and from flooding to loading (F-L) by means of increasing and falling gas rates show a hysteresis for low D/T, which becomes indistinct with the increase of D/T. At certain gas rates, D/T has no effect on relative power demand (RPD, the ratio of gassed power to ungassed power). For given power consumption, gas holdup increases slightly with increasing D/T at low gas rate, whereas it decreases apparently at high gas rate. The results and the correlations are of particular relevance to the design and operation of sparged gas-liquid stirred reactors.

Key words: stirred tank, hollow blade disk turbine, flooding, gassed power consumption, gas holdup

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