摘要
采用热风干燥、真空干燥和微波干燥分别进行明胶干燥,比较不同干燥方式下明胶的干燥特性.实验结果表明:热风干燥高度为5 mm明胶溶液,改变温度(30、40、50℃)和湿度(20%、40%)的干燥耗时为6～10 h,高度为6 mm明胶溶液的干燥耗时为8～10 h.真空干燥高度为5 mm或6 mm明胶溶液,改变压力(30、50、70 kPa)和温度(30、40、50℃),干燥时间可以缩短至1～2 h.改变明胶高度为2 mm,热风干燥温度为50℃和微波干燥功率为270 W时,干燥耗时分别为60 min和40 min.真空干燥方式下,通过控制干燥温度和真空度,明胶溶液内部会形成气泡,可增加水分溢出通道,极大地提高明胶干燥速率;明胶微波干燥速率快,但也存在较严重的干燥不均匀性.
Gelatin drying was carried out by hot air drying, vacuum drying and microwave drying, respectively, and the drying characteristics of gelatin were compared. The experimental results show that the hot air drying height was 5 mm gela-tin solution. When temperature was 30 ℃, 40 ℃, 50 ℃ and humidity was 20% or 40%, the drying time was 6-10 h. When the height was 6 mm gelatin solution, the drying time was 8-10 h. A vacuum of 5 mm or 6 mm gelatin solution was used in the research. When the pressure was 30 kPa, 50 kPa or 70 kPa, and temperature was 30 ℃, 40 ℃, 50 ℃, the drying time can be shortened to 1-2 h. When the gelatin height was 2 mm, the hot air drying temperature was 50 ℃ and the microwave drying power was 270 W, the drying time was 60 min and 40 min, respectively. In vacuum drying process, the drying temperature and vacuum were two important parameters. Bubbling phenomena were observed in the gelatin vacuum drying. The bubbling erhanced the moisture transferring channel and greatly improved the gelatin drying rate. Microwave drying rate was fastest, but caused more serious drying heterogeneity.
作者
王珊珊
吴中华
李凯
郭海滨
赵勇
WANG Shanshan;WU Zhonghua;LI Kai;GUO Haibing;ZHAO Yong(College of Mechanical Engineering,Tianjin University of Science & Technology,Tianjin 300222,China)
出处
《天津科技大学学报》
CAS
2019年第2期30-34,共5页
Journal of Tianjin University of Science & Technology
基金
国家自然科学基金资助项目(31471618)
国家重点研发计划资助项目(2017YFD0400900)
关键词
明胶
热风干燥
微波干燥
真空干燥
gelatin
hot air drying
microwave drying
vacuum drying
