Analysis Of Parameter Changes In Red Wine Fermentation Process And Development Of Monitoring System

With the rapid development of China’s grape wine industry,how to effectively monitor the wine fermentation process through information technology has become an urgent problem.Traditionally,the monitoring of wine fermentation parameters is carried out by artificial methods such as chemical titration,which are time-sensitive and inefficient,making it difficult to meet the demand for real-time monitoring of industrial-scale wine fermentation,and the heterogeneity of physical and chemical parameters caused by temperature differences at different locations in the fermentation process due to the characteristics of industrial-scale red wine fermentation,causing the fermentation monitoring data of red wine not to accurately reflect the state of the wine in the whole fermentation tank,resulting in unsatisfactory fermentation monitoring results.Based on the simulation of red wine fermentation temperature field and dynamic analysis of physical and chemical parameters of fermentation process,this study designed and developed a system for multi-point monitoring of red wine fermentation in order to provide accurate and comprehensive data support for fermentation process management and process decision.The specific contents and main conclusions of this study are as follows:(1)Simulation study on temperature field of red wine fermentation.In order to determine the representative monitoring locations in the industrial-scale red wine fermentation process,so that the fermentation monitoring data can reflect the temperature status of the wine in the whole fermenter,this study uses finite element analysis to simulate the industrial-scale red wine fermentation,and the simulation results visually demonstrate the temperature distribution in the fermenter in the industrial-scale fermentation.The results show that the highest temperature is in the center of the saturated layer,and the lowest temperature is near the wall of the fermenter and the bottom of the fermenter,and the maximum temperature difference during the first 12 hours of fermentation is about 5.21 °C.(2)Dynamic analysis of physicochemical parameters during red wine fermentation process.In order to reveal the dynamic laws of physicochemical parameters in different positions of red wine fermentation process in the fermenter,industrial scale red wine fermentation experiments were conducted to study the kinetics of bacterial growth,alcohol production and total sugar consumption in industrial scale Cabernet Sauvignon wine fermentation,and the Logistic equation and Luedeking-Piret equation were used to simulate and validate the dynamic data of each different position.The results showed that: product production and substrate consumption in fermentation were related to yeast cell growth,wine temperature increased during the process,and the temperature dynamics were related to yeast growth;glycerol concentration increased with increasing fermentation temperature during fermentation,and the glycerol concentration at higher positions of wine temperature was higher than that at lower positions of temperature;coloration during fermentation did not reach a high level during maceration,but gradually accumulated with the temperature of the liquor rises,and reaches its maximum color at the highest temperature period;monitoring the temperature during fermentation can assist in understanding the state of fermentation.(3)Research and development of a multi-point monitoring system for red wine fermentation.In order to provide an automated,accurate and real-time red wine fermentation data monitoring platform for wine fermentation process managers,this paper designs and develops an Io T-based multi-point monitoring system for red wine fermentation,monitoring parameters including temperature,p H,dissolved oxygen and conductivity of wine.With reference to the conclusion of red wine temperature field simulation,the sensors of the system are placed in the center of the saturated layer,the saturated layer near the fermenter wall and the bottom of the fermenter,and the multi-point fermentation parameters are visualized through the self-designed visualization platform.The results show that the system can initially meet the application requirements of industrial-scale wine fermentation monitoring.