外环流式发酵罐用于玉米生料酒精发酵的研究

Study on alcoholic fermentation with uncooked corn flour in external circumfluent fermentor

对玉米粉悬浮液沉降情况的研究表明,沉降界面初始沉降速度随初始浓度的增加而减小。对外环 流式发酵罐用于玉米生料酒精发酵进行研究,结果表明,起始阶段,玉米粉悬浮液要在外环流式发酵罐中完成强制 回流循环,必然存在一个最小回流量Q;通过恒流泵强制发酵醪循环可以显著缓解原料沉淀造成的不利影响,有利 于发酵罐中的传质;发酵20 h,强制循环发酵液中酵母细胞出芽率较自然发酵提高84．8％,死亡率降低100％,发 酵70 h时酒精度提高11．5％;采用外环流式发酵罐进行玉米生料发酵酒精时,较大的高径比对发酵有利。

In the alcoholic fermentation with external circumfluent fermentor,the sediment of raw corn flour was studied. The results indicated that the initial settling velocity decreased with the increase of initial concentration. It also proved that a smallest circulation flux existed for corn flour suspension to fulfill compulsory circulation. Compulsory circulating fermentation promoted the process of transferring mass, the multiplication rate of the yeast cell was increased by 84.8% ,the death rate of that was decreased by 100% after 20 hours＇ fermentation,and the ethanol concentration at 70 h was increased by 11.5% compared with none circulating fermentation. Additionally,the fermentor with the bigger ratio of height to diameter contributed to alcoholic fermentation with uncooked corn flour.