共查询到19条相似文献,搜索用时 69 毫秒
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The general objective of this work is to analyze energy input in a vacuum process with the incorporation of microwave heating. Thus, necessary criteria for designing an efficient freeze-drying operation are considered through the analysis of strategies based on the combination of different intensities of raxiiant and microwave heating.The other aim of this research topic is to study the kinetics of drying in relation to mass transfer parameters.Five freeze-drying strategies using both heating systems were used. Consequently, energy input could be related to diffusivity coefficients, temperature and pressure profiles during dehydration of the product and analyzed in comparison to a conventional freeze-drying process. 相似文献
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针对玉米热风干燥中存在的问题。运用自制的微波干燥试验设备。采用不同的质量比功率和加热时间及配套的工艺流程。研究了玉米微波干燥特性及干燥条件对干燥品质、能耗的影响;分析了微渡干燥玉米过程中单位质量功耗、温度、平均失水速率与玉米籽粒发芽率、爆腰率和淀粉得率的关系;确定了影响微波干燥玉米的工艺参数和玉米微波干燥的合理工艺流程。研究结果表明:玉米微波干燥主要处于恒率干燥阶段,应用微波技术既能快速而经济地对玉米籽粒进行干燥,又能保持其种用价值,且有利于改善其品质。 相似文献
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将微波干燥和热风干燥应用于新鲜金萱茶叶的干燥,在3个不同的微波功率(350 W,470 W,800 W)和4个不同的空气温度(70 ℃,80 ℃,90 ℃,100 ℃)下,研究了干燥参数即微波功率或温度对干燥时间、失水量的影响,同时还考察了茶叶中茶多酚总量和儿茶素含量的变化、干茶叶的复水性。实验得出,与热风干燥相比,微波干燥的时间缩短了76%~95%,而且干燥后的茶叶有很好的复水性,但干燥后茶多酚总量少于热风干燥;同时随着功率增加,微波干燥时间由11 min降为6 min,随着温度升高,热风干燥时间由127 min缩短为45 min。这两种方法的茶叶干燥动力学模型均满足Page’s半经验公式。 相似文献
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壳聚糖的微波干燥行为的研究 总被引:4,自引:0,他引:4
本文对壳聚糖在微波和烘箱技术条件下的干燥行为进行了研究。并对其脱乙酰度、粘度、分子量及红外光谱进行了测定。结果表明,用微波干燥处理壳聚糖所用的时间是用烘箱处理所需要的十分之一;而其脱乙酰度、粘度、分子量及红外光谱在两种条件下测得的结果几乎一致。实验还发现,在相同条件下,由虾壳制得的壳聚糖,其分子量和粘度都大于由蟹壳制得的产品。 相似文献
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热泵微波联合干燥系统研究 总被引:6,自引:0,他引:6
对热泵微波干燥的实用性及其性能进行了模拟分析和试验研究 ,试验及计算结果吻合较好。分析了空气旁通率、压缩机转速及空气质量流量等主要设计及运行参数对干燥性能的影响。与蒸汽加热干燥比较的结果表明 :通过精心设计热泵微波干燥系统 ,可使其能耗与蒸汽加热干燥相当。 相似文献
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《Drying Technology》2013,31(10):2331-2341
Abstract Experimental results on microwave drying of the porous particles exposed to air stream at 40°C are presented. The temperature and moisture distribution inside a particle were measured for gypsum spheres of 9, 18, 28, and 38 mm. The mass reduction was monitored during the drying process. The rate of drying and changes in temperature and moisture profiles for different drying conditions were analyzed and compared with the ones for convective drying. 相似文献
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Microwave Drying of Porous Materials 总被引:3,自引:0,他引:3
Experimental results on microwave drying of the porous particles exposed to air stream at 40°C are presented. The temperature and moisture distribution inside a particle were measured for gypsum spheres of 9, 18, 28, and 38 mm. The mass reduction was monitored during the drying process. The rate of drying and changes in temperature and moisture profiles for different drying conditions were analyzed and compared with the ones for convective drying. 相似文献