| Summary: | 碩士 === 國立臺灣科技大學 === 化學工程系 === 89 === Abstract
In this study, the influences of agitation speed, working liquid level and reactor diameter on onset speed, power consumption, gas holdup, bubble diameter and gas holdup for the new gas-inducing reactor, which developed by Hsu and Huang (1996) were investigated. Moreover, the effects of various operating parameters, inducing agitation speed, working liquid level, gas pressure and liquid temperature, on the oxygen volumetric mass transfer coefficient were also studied. Basic of the practical utility, the scale-up rule for the new gas-inducing reactor was carried out.
Arrangement of the experimental results, the correlation equations for onset speed, power consumption and gas holdup were obtained. These equations predicated the onset speed, the power consumption and gas holdup accurately. The bubble diameter and gas holdup increased as the agitation speed increased, however, the influence decreased at higher agitation speed. At higher working liquid level, the bubble diameter and gas holdup were smaller. From the oxygen mass transfer experimental results, it was evident that the oxygen volumetric mass transfer coefficient increased as the agitation speed, gas holdup and liquid temperature increased. In addition, the empirical equation for oxygen volumetric mass transfer coefficient was obtained.
In the scale-up study, the value of scale-up exponent n based on the same specific power consumption (i.e. the same mass transfer coefficient) was 2/3, which was coincided with the theory. In addition, the oxygen volumetric mass transfer coefficient was used to identify the scale-up exponent. The result showed that the scale-up exponent, 2/3 was correct.
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