摘要
在直径为0.476m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.
The influences of impeller diameter （0.28T, 0.33T, 0.40Tand 0.57） 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.
出处
《过程工程学报》
EI
CAS
CSCD
北大核心
2008年第3期444-448,共5页
The Chinese Journal of Process Engineering
基金
国家自然科学基金资助项目(编号:20576009)
关键词
搅拌槽
半椭圆管盘式涡轮桨
气泛
通气功率
气含率
stirred tank
hollow blade disk turbine
flooding
gassed power consumption
gas holdup
