真空冷冻干燥沙棘果冻干时间模拟与实验研究

Simulation and Experimental on Freeze-drying Time of Sea Buckthorn inVacuum Freeze-drying

本文建立了沙棘果冻干过程的准稳态模型,对真空冷冻干燥工艺中沙棘果的升华干燥时间进行了理论计算与实验验证。经过多组实验,由极差分析法分析确定了优化冻干方案,得到适宜的加热板温度、物料厚度、真空度及干燥时间等工艺参数。结果表明:加热板温度32℃、物料厚度8 mm、真空度30 Pa为沙棘果冻干方案的最佳工艺参数,实验得到的实际升华干燥时间为19.5 h,理论计算预测的升华干燥时间为17.8 h,二者较为接近,相对误差为8.7%。

This paper established a quasi-steady state model of sea buckthorn freeze-drying process.The theoretical calculation and experimental verification of the sea buckthorn drying time in vacuum freeze-drying process were carried out.After several sets of experiments,the optimal freeze-drying solution was determined by the range analysis,and the parameters such as the heating plate temperature,material thickness,vacuum degree and drying time were obtained.The results showed that the heating plate temperature of 32℃,material thickness of 8 mm and vacuum degree of 30 Pa are the optimal process parameters of the sea buckthorn freezedrying solution.The actual drying time obtained by the experiment was 19.5 h,and the theoretical calculation drying time was 17.8 h,they were closest with a relative error of 8.7%.