CAJ | 학술논문

黄原胶的发酵后期发酵液体系黏度增大，呈典型假塑性非牛顿流体特性，发酵液体系的混合成为提高黄原胶发酵生产水平的主要制约因素。研究黄原胶的混合特性与影响因素从而提高混合效果意义非凡，因此文中采用比色法与pH法相结合的方式研究黄原胶水溶液的混合过程。重点考察了6种桨型组合、3种黄原胶质量分数、2种通气比和4种单位体积功率。通过以上研究得出对于高黏体系，不同搅拌型式的混合效果区别很大，大桨型组合（D/T＝0．9，0．95）的混合效果明显好于小桨型（D/T＝0．43）；对于相同直径（D/T＝0．43）的组合桨，轴流桨组合的混合效果比径流桨组合好；得到混合时间与单位体积功率、表观黏度的关联式。这一结论为工业上提高黄原胶发酵产量提供了理论指导，具有一定的实际意义。
황원효적발효후기발효액체계점도증대，정전형가소성비우돈류체특성，발효액체계적혼합성위제고황원효발효생산수평적주요제약인소。연구황원효적혼합특성여영향인소종이제고혼합효과의의비범，인차문중채용비색법여pH법상결합적방식연구황원효수용액적혼합과정。중점고찰료6충장형조합、3충황원효질량분수、2충통기비화4충단위체적공솔。통과이상연구득출대우고점체계，불동교반형식적혼합효과구별흔대，대장형조합（D/T＝0．9，0．95）적혼합효과명현호우소장형（D/T＝0．43）；대우상동직경（D/T＝0．43）적조합장，축류장조합적혼합효과비경류장조합호；득도혼합시간여단위체적공솔、표관점도적관련식。저일결론위공업상제고황원효발효산량제공료이론지도，구유일정적실제의의。
In the later period of xanthan fermentation,the broth shows classical pseudoplastic rheology property, which makes mixing efficiency to be the major limitation for xanthan production.Therefore,it′s quite valuable to understand the mixing process in xanthan broth and its influencing factors.The mixing process of xanthan solution was studied by both colorimetric and pH method.Focusing mainly on the mixing process under various operating conditions:six kinds of impeller combinations,three xanthan mass fractions,two gas flow rates and four volumetric power consumptions,it reveals that for high xanthan viscosity,different impellers show distinguished mixing capacity:the large impeller combinations (D/T=0.9,0.95)are significantly better than those of small impellers (D/T=0.43 ).For impellers with the same diameter (D/T=0.43 ),axial propellers combinations are much better than those of radial propellers.Mixing time is correlated well with apparent viscosity and specific power consumption.This conclusion provides a theoretical guidance to improve the industrial xanthan fermentation,and has a practical significance.