滚筒式茶叶热风复干机设计与试验  

Design and Experiment of Drum-type Hot Air Re-dryer for Tea

作　　者：张开兴[1] 王文中 赵秀艳[2] 刘贤喜[1,3] ZHANG Kaixing;WANG Wenzhong;ZHAO Xiuyan;LIU Xianxi(College of Mechanical and Electronic Engineering,Shandong Agricultural University,Tai an 271018,China;College of Information Science and Engineering,Shandong Agricultural University,Tai an 271018,China;Shandong Provincial Engineering Laboratory of Agricultural Equipment Intelligence,Tai an 271018,China)

机构地区：[1]山东农业大学机械与电子工程学院,泰安271018 [2]山东农业大学信息科学与工程学院,泰安271018 [3]山东省农业装备智能化工程实验室,泰安271018

出　　处：《农业机械学报》2020年第5期377-386,共10页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家重点研发计划项目(2017YFD0700100);山东省农业重大应用技术创新项目。

摘　　要：针对茶叶复干机热能利用率低、茶叶受热不均匀及生产率低等问题,为提高茶叶加工的品质及产量,设计了一种滚筒式茶叶热风复干机。阐述了复干机的基本结构及工作原理,并对其关键部件进行了理论分析,确定了滚筒、传动系统、热风控制柜等关键部件参数。运用CFD-DEM耦合仿真方法分析了滚筒不同转速下筒体内茶叶颗粒的分离比率及温度变化情况,得出滚筒转速为15 r/min时,茶叶颗粒分离比率及温度变化最优,复干效果最佳。在设计与仿真的基础上,设计了一组传统的滚筒式茶叶复干机试验,并与本文所设计的复干机试验相对照,结果表明:当滚筒转速为15 r/min、选用三级鲜叶作为原料时,复干机的生产率、含水率、碎茶率、电耗率及有效工作温度分别为65 kg/h、3.5%、0.8%、0.6 kW·h/kg、130℃,复干机加工的茶叶感官达到特级标准,各项指标均优于传统机器,且满足复干机的工作要求。Aiming at the problems of low heat energy utilization rate,uneven heating of tea and low productivity,etc.,in order to improve the quality and yield of tea processing,a drum-type tea hot air re-dryer machine was designed.The basic structure and working principle of the dryer were explained,and the key components were analyzed theoretically.The key design parameters such as the drum speed,installation angle of roller,and hot air control cabinet were determined.The CFD-DEM coupling simulation method was used to analyze the separation ratio and temperature change of tea particles in the barrel at different rotation speeds of the drum.It was found that when the rotation speed of the drum was 15 r/min,the tea particles separation ratio and temperature were changed optimally,and the re-dryer effect reached the optimum.Based on the design and simulation experiments,a set of traditional tumbler tea dryers were designed to be compared with the designed re-dryer.The test results showed that when the average speed of the drum was 15 r/min,the average working temperature was 130℃,when three fresh leaves were used as raw materials,the productivity,moisture content,tea break rate,power consumption rate,and effective working temperature of the re-dryer were 65 kg/h,3.5%,0.8%,0.6 kW·h/kg and 130℃,respectively.At 130℃,the tea leaves processed by the re-dryer machine can reach the super-standard standards,and each index was better than that of traditional machines,which met the working requirements of the re-dryer machine.

关 键 词：滚筒式 茶叶复干机 参数设计 耦合仿真 试验 

分 类 号：S226.9[农业科学—农业机械化工程] S220.2[农业科学—农业工程]