南方波纹米粉丝的热泵干燥工艺优化

Technology optimization of heat pump drying for southern corrugated rice vermicelli

以南方波纹米粉丝干燥效果评价值为指标,分别研究了南方波纹米粉丝热泵干燥过程中温度、载样量、风速各单因素对南方波纹米粉丝干燥效果的影响,并采用完全析因设计对其干燥工艺条件进行了优化。结果表明,温度、载样量及干燥风速对南方波纹米粉丝干燥效果评价值都有显著的影响,南方波纹米粉丝热泵干燥的最佳工艺条件为:温度50℃、载样量40 kg及干燥风速0.4 m/s。在此条件下南方波纹米粉丝的断条率为4.26%,蒸煮损失率为2.76%,品质综合评价值为70.32,干燥速率为0.08 g/min,单位能耗为0.31 k W·h/kg,干燥效果评价值为79.28。与热风干燥的相比,南方波纹米粉丝断条率、蒸煮损失率分别降低了43.35%、25.61%,品质综合评价值提高了51.39%,单位能耗降低了13.89%。

With the evaluation value of the drying effect of southern corrugated rice vermicelli as the index, the effects of temperature, sample load and wind speed on the drying effect of southern corrugated rice vermicelli were researched, and the technological conditions were optimized by full factorial design. The results showed that the temperature, sample load and wind speed affected the evaluation value of the drying effect of southern corrugated rice vermicelli significantly. The optimum technological conditions for the drying of southern corrugated rice vermicelli were as follows： the temperature was 50 ℃, the sample load was 40 kg and the wind speed was 0.4 m/s. Under these optimized conditions, the cooked broken rate of southern corrugated rice vermicelli was 4.26%, the cooked loss rate of southern corrugated rice vermicelli was 2.76%, the comprehensive evaluation value for the quality of southern corrugated rice vermicelli was 70.32, the drying rate was 0.08 g/min, the unit energy consumption was 0.31 kW·h/kg and the evaluation value of the drying effect was 79.28. Compared with hot-air drying, the cooked broken rate decreased by 43.35%, the cooked loss rate decreased by 25.61%, the comprehensive evaluation value for the quality increased by 51.39%, and the unit energy consumption decreased by 13.89%.