直接式杀菌在降膜式蒸发器中的设计及应用

Design and Application of Direct Sterilization in Falling-Film Evaporator

在奶粉生产中,直接式杀菌与间接式杀菌相比具有杀菌温度稳定且比较均匀、灭菌效果佳、不易产生结垢或结焦、清洗间隔时间较长的优点,不足之处为在杀菌过程中蒸汽直接混入料液中会使料液增湿、杀菌完毕需要将增加部分水分经过闪蒸去除从而对蒸汽质量要求较高。因此,蒸汽必须经过严格过滤或采用单独的蒸汽发生装置方可进入料液中。本文仅以华禹乳品机械制造有限公司生产的RNJM03-8000型三效降膜式蒸发器在奶粉生产中的应用为例,对该设备在奶粉生产中的直接式杀菌设计过程及注意事项进行阐述。

In the production of milk power, direct sterilization offers many advantages over indirect sterilization such as more stable and more evenly distributed sterilization temperature, better sterilization effect, being less easy to cause fouling and coking, and longer time intervals for cleaning. Its disadvantage lies in its high requirements for the quality of steam as the material fluid is moistened as a result of direct mixing of steam during the sterilization process and the absorbed moisture has to be removed by flash evaporation after the sterilization. Therefore, steam must be strictly filtrated or be generated by a specialized generator before coming into contact with the material fluid. In this study, a three-effect falling film evaporator RNJM03-8000, manufactured by Huayu Dairy Machinery Manufacturing Co. Ltd., was used to evaluate its application for the production of milk powder. The design of direct sterilization for producing milk powder using the device and points for attention were elaborated.