cylinder dryer based on multiphase flow theories

 

 

SHI Zhong ju1, ZHANG Xian1, ZHONG Jiang1, QIAO Xin1, DAI Hui liang2

 

(1. Key Laboratory of Special Purpose Equipment and Advanced Processing Technology, Ministry of Education &

 

Zhejiang Province, Zhejiang University of Technology, Hangzhou 310014, China;

 

2. Zhejiang Shangyang Machinery Co., Ltd., Quzhou 324000, China)

 

 

Abstract: Aiming at solving low utilization rate of heat energy and improving the quality and quantity of tea, specific model of tea hotair cylinder dryer was studied. The approach of combining EDEM and FLUENT was used to analysis the discrete field, flow field and temperature field during the deenzyme process, and to study the impact of roller speed, the number of shovelling plate, the width and height of shovelling plate and the structure of hotair inlet on quality of tea. In combination with engineering practice, the target machine was optimized by increasing the number of shovelling plate and changing the air inlet from concave to convex. The results indicate that, the rate of temperature rise of tea and the temperature field in the cylinder are influenced by the roller speed, the number of shovelling plate and the structure of hotair inlet. The optimized machine can improve the quantity of tea by 25%, while improving the quality of tea. The method of multiphase flow coupling can also be used to develop and optimize a variety of tea processing equipments.

 

Key words: tea; de enzyme; multiphase flow coupled; EDEMFLUENT; discrete element; hot air