多孔板式ガスかくはん槽の基本特性

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A new type of gas-stirred reactor with five short tubes has been constructed. Two of the draft tubes in the reactor are convered with perforate plates, one positioned 250.5 mm and the other 1,250.5 mm from the bottom of the reactor vessel, which has an inside diameter of 500 mm and is 2,600 mm high. Several other plate positions were also tried, but the highest volumetric oxygen transfer coefficient (K_La) was obtaind with the above positions. The superficial gas velocity Vs was, of course, the same for the several reactors in any one experiment.The K_La of the new reactor was also higher than that of reactors with either one short or one long draft tube for every Vs used. However, the gas holdup values were almost the same for the reactor with five tubes and those with one tube. The smaller diameter of the gas bubbles in the new reactor, which resulted in an increase in the area of the gas-liquid interface, is thought to be the cause of this anomaly.The shortest mixing time was also obtained with the new reactor, as was the maximum down-flow rate.The highly complex liquid flow pattern in the open spaces between draft tubes in the new reactor was observed by introducing plastic particles into the liquid.Our investigations have shown that gas is dispersed most effectively, and that partial, as well as whole, circulation flow patterns are generated in reactor with five short draft tubes, two of which are covered with perforate plates.
社団法人日本生物工学会の論文
1981-05-25

多孔板式ガスかくはん槽の基本特性

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