Temperature field simulation and feedback regulation system  design of tea leaves withering device

ZHANG Rui, JI Shiming, ZHANG Li

(Key Laboratory of E&M, Ministry of Education & Zhejiang Province, Zhejiang University of
Technology, Hangzhou 310014, China)

Abstract: Aiming at the problem of low productivity and consistency of production line, tea withering device and its temperature field distribution, feedback regulation system and the withering time of fresh tea leaves etc. were researched. By controlling the withering conditions, the wilting time of fresh tea leaves and the continuity of the whole product line was combined. A new tea leaves withering device was proposed based on online detection and feedback regulation. The mesh conveyor belt was used to transport fresh tea leaves. Moisture content of tea was realtime detected. The temperature and air volume were feedback controlled based on the detected moisture content. The feedback regulation system was designed. The velocity profile and temperature field of hotair in withering room was simulated by Fluent and Experimental study was carried out. The results indicate that the distribution of hot air is uniform and smoothly and the distribution of temperature is gradient in withering room, which ensured the effective wilting processing of fresh tea leaves. The reasonability of physical design is proved. The better withering homogeneity and high production efficiency are the advantages of the device. The coherent running of the whole pipeline is ensured and withering efficiency of the machine is improved.

Key words: tea; withering device; feedback regulation; simulation