怀山药片热泵-热风联合干燥研究  

Combined heat-pump and hot-air drying on Dioscorea opposite Slices

作　　者：李晖[1] 任广跃[1] 时秋月[1] 陈媛媛[1] 李丹[1] 刘晨[1] 

机构地区：[1]河南科技大学食品与生物工程学院,洛阳471023

出　　处：《食品科技》2014年第6期101-105,共5页Food Science and Technology

基　　金：河南科技大学研究生创新基金项目(CXJJ-Z025);国家级大学生创新创业训练计划项目(201210464014)

摘　　要：以提高怀山药片干燥效率和产品品质为目标,利用热泵-热风联合干燥方法,研究了热泵温度、热泵风速、切片厚度、热风温度以及联合干燥含水率转换点对怀山药片干燥速率、L值、复水率的影响。为避免怀山药片营养成分的损失以及色泽和质地变差,在前期的低温热泵干燥阶段,采用干燥温度为40℃,热泵风速为1.5 m/s;同时为了避免怀山药片表面结壳和焦化断裂现象,采用物料厚度为5 mm。在后期的热风干燥中,为提高干燥速率和保持较好色泽,将热风温度设置为60℃。试验结果表明:热泵-热风联合干燥的最佳参数为热泵温度40℃,热泵风速1.5 m/s,切片厚度5 mm,热风温度60℃,转换点干基含水率为1.00。The combination heat-pump and hot-air drying process of Dioscorea opposite slices were studied in this work. The drying process was proposed to improve the drying efficiency and product quality. The influences of the heat-pump drying temperature, airflow rate, slice thickness, hot-air temperature and moisture content of the transfer point on the drying rate, brightness, rehydration rate were investigated. In order to prevent nutrient loss, color and texture hardening of Dioscorea opposite slices, heat-pump drying temperature 40 ℃ and the airflow rate 1,5 m/s were set during the low- temperature heat pump drying stage, at the same time slice thickness of 5 mm was used to prevent crust and coking fracture. During the hot-air stage, 60 % was used to improve the drying rate and better color. The results showed that the optimal drying parameters were heat-pump temperature 40 %, airflow rate 1.5 m/s, slice thickness 5 mm, hot-air temperature 60 ℃, and the dry basis moisture content at transformation point was 1.00.

关 键 词：怀山药 联合干燥 热泵 热风 

分 类 号：TS255.3[轻工技术与工程—农产品加工及贮藏工程]