脱水蔬菜热泵-热风组合干燥试验

Combined heat-pump and hot-air drying of dehydrated vegetables

摘要: 为了解决脱水蔬菜热泵干燥中后期干燥效率较差的问题，文章进行了热泵、热风组合干燥试验。结果表明：采用热泵-热风组合干燥装置生产脱水蔬菜，其耗能只有隧道式干燥的74.1%，网带式干燥的84.7%和真空冷冻干燥的9.4%。胡萝卜产品经24 h充分复水后，组合干燥的复水性比热泵干燥高16.6%，比热风干燥高24.5%。采用前期热泵除湿干燥与后期热风干燥的组合干燥技术，克服了单一热泵干燥的缺点，降低了能耗，提高了产品质量。

Abstract: In order to improve the drying efficiency of heat pump for dehydrated vegetables during the falling drying period, the combined experiment of heat-pump and hot-air drying was carried out. The experimental results showed that the energy consumption of combined drying, was 74.1%, 84.7% and 9.4% of that of tunnel drying, band drying and vacuum freeze drying, respectively. After the carrot products were rehydrated for 24 hours, the rehydration of combined drying was 16.6% and 24.5% higher than that of heat-pump drying and hot-air convective drying, respectively. Therefore, compared with the conventional heat-pump drying, the energy consumption of the combined drying is reduced and the product quality is also improved.