食品液氮速冻处理的热力与经济分析

主要介绍了液氮速冻处理的几种形式,讨论了食品流态化速冻装置的特点,分析了食品液氮速冻过程的热力特性和技术经济特点,并通过具体算例比较了食品速冻处理的几种方案,说明了液氮速冻与常规机械式流态化装置联合运行的可行性。分析结果还表明,液氮流态化速冻装置产品质量高,但运行成本也高,目前还只适合于生产高质量的、具有高附加值的产品。

The fast freezing treatment of food with liquid nitrogen

In this paper, several types of food treatment with liquid nitrogen are introduced, the characteristics of food fluidized bed freezing equipment are discussed, the thermal and economical aspects of the liquid nitrogen food treatment process are analyzed, some projects for food fast freezing are compared through a case study, and the feasibility of a combination of a liquid nitrogen freezer and a conventional mechanical refrigerated fluidized bed equipment is demonstrated. The analysis also indicates that the liquid nitrogen fluidized bed equipment produces good-quality products, but the operation cost is still high. At present, it is only practical for producing good-quality products high additional value.