实验型喷雾干燥机低温干燥牛初乳粉的干燥性能

Low-temperature spray drying performance of laboratory spray dryer for bovine colostrum powder

为了提高牛初乳粉的回收率,该文选择输入气体温度、压缩气体流量以及干燥气体流量为影响因素,通过测定出口气体温度和牛初乳粉在干燥器各部件中的损失量以及产品的回收量,对牛初乳低温喷雾干燥过程的热效率和牛初乳粉的收集指标进行试验研究。结果表明:出口气体温度与3个影响因素均成正比关系,总的热效率和蒸发热效率的范围分别为47.23%～66.68%、58.59%～82.76%,二者均随干燥气体流量和压缩气体流量的增加而减小;牛初乳粉的黏壁率较大,且随干燥气体流量的增加而增加,随压缩气体流量的增加而减少,牛初乳粉的回收率较小,且随压缩气体流量和干燥气体流量的增加呈下降趋势。3个因素对牛初乳粉的黏壁率、损失率和回收率均有显著影响。在试验范围内,较佳的工艺参数组合为输入气体温度为110℃,压缩气体流量为300L/h,干燥气体流量为0.78m3/min。该试验为牛初乳粉的工业化生产提供了相关的基础性数据。

To improve product recovery of bovine colostrum powder,spray dryer＇s thermal efficiencies and collection conditions of bovine colostrum powder during low-temperature spray drying were investigated,by choosing inlet air temperature,compressed air flow rate and drying air flow rate as independent variables,and measuring outlet air temperature,residue accumulation on different parts of dryer and product recovery.It could be concluded that outlet air temperature was directly proportional to three independent variables,overall thermal efficiency and evaporative efficiency varied from 47.23% to 66.68%,from 58.59% to 82.76%,respectively,and they decreased as drying air flow rate and compressed air flow rate increased.Results also indicated that residue accumulation increased as drying air flow rate increased and compressed air flow rate decreased;product recovery decreased as compressed air flow rate and compressed air flow rate increased.Residue accumulation,product recovery and product loss were significantly affected by three drying parameters.The optimal drying process parameters obtained were as follows：inlet air temperature of 110℃,compressed air flow rate of 300 L/h,and drying air flow rate of 0.78 m^3/min in this experiment.The results were expected to provide some fundamental data for the industrial production of bovine colostrum powder.