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荔枝热泵干燥特性及干燥数学模型

作  者:
杨韦杰;唐道邦;徐玉娟;吴继军;肖更生
单  位:
广东省农产品加工重点实验室
关键词:
荔枝;热泵干燥;数学模型;干燥曲线;干燥速率
摘  要:
为探索荔枝热泵干燥特性,研究55、60、65℃干燥温度及0.4、1.0m/s风速条件下整果荔枝热泵干燥曲线和干燥速率随时间变化曲线的相关规律,通过水分比的变化拟合荔枝热泵干燥数学模型.结果表明:干燥温度对荔枝整果干燥速率影响较大,干燥温度越高,干燥用时越短;风速对荔枝干制加工时间的影响较小;降速干燥阶段为荔枝热泵干燥过程的主要阶段;Midilli模型能较好模拟整果荔枝热泵干燥过程,模型预测值与实验值比较吻合,可以用来描述和预测荔枝的热泵干燥进程.
单  位:
Guangdong Key Laboratory of Agricultural Product Processing,Sericulture and Farm Product Processing Research Institute,Guangdong Academy of Agricultural Sciences,Guangzhou 510610,China%College of Bioscience and Bioengineering,Jiangxi Agricultural University,Nanchang 330045,China
关键词:
litchi%heat pump drying%mathematical modeling%drying curve%drying rate
摘  要:
The heat pump drying characteristics of whole litchis were investigated.Drying experiments were carried out at different levels of temperature(55,60 ℃ and 65 ℃) and air velocity(0.4 m/s and 1.0 m/s).Different mathematical models were developed to test the drying behavior of litchis.The results showed that temperature affected the drying rate of whole litchis: the higher the drying temperature,the shorter the drying time.Minimum influence of air velocity was observed on the processing time of litchis.The falling-rate period was a key stage in the heat pump drying process of litchis.The proposed Midilli model fitted very well the heat pump drying process of whole litchis.There was good agreement between the predicted and experimental values,indicating the reliability of this model.

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