When the speed control in the whole fermentation process is variable, NB is increased 36% in comparing with that of the constant speed control (CSC). Furthermore, the shaft Power assumption is saved 50% in comparing with that in the CSC at 600 r/min.

• 发酵全过程采用变转速控制,菌数比300 r/min定速控制提高36%25,轴功耗较600r/min定速控制节约50%25。