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Journal of Tea Science ›› 2023, Vol. 43 ›› Issue (5): 681-690.doi: 10.13305/j.cnki.jts.2023.05.004

• Research Paper • Previous Articles     Next Articles

Parameter Optimization of Black Tea Fermentation Machine Based on EDEM and RSM

LIU Limin1, DONG Chunwang2,3, LIN Shuhong3,*, SHI Yali2,*   

  1. 1. Zhejiang Technical Institute of Economics, Hangzhou 310018, China;
    2. Tea Research Institute, Shandong Academy of Agricultural Sciences, Jinan 250100, China;
    3. The Industrial Development Center of Hehong Tea of Yanshan, Shangrao 334500, China
  • Received:2023-05-08 Revised:2023-08-30 Online:2023-10-15 Published:2023-11-06

Abstract: Fermentation is a key process for the formation of black tea quality, and the fermentation conditions are the important factors affecting the degree of fermentation. In order to optimize the parameters of a self-designed roller fermentation machine, the extended distinct element method (EDEM) was used to simulate three distinct gradients of the rotational speed of the flexible scraper, and compare the degree of uniformity. With sensory score as evaluation index, response surface method (RSM) was applied for optimizing three key factors affecting fermentation quality (fermentation temperature, fermentation time, stirring interval). The results indicate that the uniformity of fermentation was the best at a rotation speed of 36(°)·s-1. Based on this rotational speed, the order of importance of each factor on fermentation quality was: fermentation time, fermentation temperature, stirring interval. The optimal process parameters were as follows: fermentation time, 230βmin, fermentation temperature, 28.5β℃, and stirring interval, 20βmin.

Key words: black tea fermentation, technological parameter, response surface method, extended distinct element method

CLC Number: