High-temperature Daqu fermentation process is undergoing process upgrading, however using the shelf Daqu incubation leads to the drop of peak temperature and its maintenance.The existing temperature control strategy is not sufficient considering the heat dissipation only.We analyzed the mechanism of Daqu temperature from the perspective of heat production, and explored the effect of aeration (50, 100, and 200 L/h) on the heat production of Daqu fermentation in a 20 L fermentation system. Based on the heat balance, the heat of Daqu fermentation was visualized by constructing a virtual simulation through COMSOL platform.The lab-scale Daqu fermentation experiments were carried out, and the peak temperature of control group was 52.23 ℃, the peak temperature of 50 L/h group was 53.63 ℃ with an increase of 2.68%, the peak temperature of 100 L/h group was 53.90 ℃ with an increase of 3.20%, and the peak temperature of 200 L/h group was 48.10 ℃ with a decrease of 7.91%.The virtual simulation of control group was verified to have a better effect with a mean relative error of 2.93% and a correlation coefficient of R2 (0.97).The simulation became worse in the experimental group, proving that the aeration operation affected the Daqu fermentation heat accumulation.Based on the virtual simulation, the regulation strategy of Daqu temperature was discussed in combination with the two perspectives of heat dissipation and heat production, which proved that the virtual simulation technology has application prospect in the regulation and optimization of Daqu fermentation.The study provides a reference for process control and optimization of traditional Daqu solid-state fermentation.
JIN Guangyuan
,
ZHAO Yujie
,
TANG Qunyong
,
SUN Ying
,
ZHOU Zhensu
,
WU Jianfeng
,
XU Yan
. Virtual simulation and control of Daqu fermentation at lab-scale[J]. Food and Fermentation Industries, 2024
, 50(17)
: 103
-110
.
DOI: 10.13995/j.cnki.11-1802/ts.039855
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