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基于闪蒸理论,搭建了真空闪蒸制冰的实验装置。选取无机盐氯化钠溶液、有机盐甲酸钠溶液和纯水进行真空闪蒸制冰实验,获得整个制冰和融冰周期内的图像和温变曲线,比较分析了盐溶液种类、浓度对整个真空闪蒸制冰过程换热特性的影响。结果表明:纯水闪蒸结束后形成固体冰,钠盐溶液闪蒸制取的冰成流态均匀分布;钠盐溶液结冰过程维持的成冰温度低于纯水的温度,溶液储冷能力更高,成冰速度更快;浓度越高,溶液结冰过程维持的成冰温度也越高,储冷能力下降,但融冰速度较快,浓度为5%的氯化钠溶液,成冰温度最低,储冷能力最高,浓度为20%的甲酸钠溶液,储冷能力最低。
Based on the flash theory, an experimental device for vacuum flash ice making was established. Inorganic salt sodium chloride solution, organic sodium formate solution and pure water were used for vacuum flash ice making experiment to get the whole image of ice-making and thawing period and the curve of temperature change. The types of salt solution, Effect of heat transfer on flash ice making process. The results show that the formation of solid ice after the flashover of pure water, sodium salt solution obtained by flash evaporation into a uniform flow pattern; sodium salt solution icing process to maintain the ice temperature is lower than the pure water temperature, the solution storage cooling capacity Higher and faster ice formation. The higher the concentration, the higher the ice formation temperature and the cold storage capacity maintained by the solution freezing process. However, the ice melting speed is relatively high, and the concentration of 5% sodium chloride solution and ice formation The lowest temperature, storage capacity of the highest concentration of 20% sodium formate solution, storage capacity of the lowest.