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蒸发系统

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传统多效蒸发器

添加时间:2018/12/18
 

传统多效蒸发器Traditional multiple effect evaporator

1、工作原理Working principle

将几个蒸发器串联运行的蒸发操作,使蒸汽热能得到多次利用,从而提高热能的利用率,多用于水溶液的处理.
Connect several evaporators in serial to use heat energy of steam for more time and increase heat energy utilization and mostly used for dealing with water solution.

2、主要特点Main characteristics

多效蒸发流程是由多个蒸发器组合后的蒸发操作过程。多效蒸发时要求后效的操作压强和溶液的沸点均较前效低,引入前效的二次蒸汽作为后效的加热介质,即后效的加热室成为前效二次蒸汽的冷凝器,仅第一效需要消耗生蒸汽。一般多效蒸发的末效或后几效总是在真空下操作,由于各效(除末效外)二次蒸汽都作为下一效的加热蒸汽,故提高了生蒸汽的利用率,即经济性。
Multiple evaporation is evaporation process by several evaporators. Operating pressure and boiling point of solution of the second effect should be lower than first effect. Second steam of first effect can be heating medium for second effect which means heating chamber of second effect is the condenser of second steam from first effect. Only first effect need fresh steam. Usually the last effect or last several effects are operated under vacuum. Second steam of every effct will be used as heating steam for the next effect so efficiency of fresh steam has been increased.
多效蒸发量与传热量成正比,多效蒸发并没有提高蒸发量,而只是节约了加热蒸汽,其代价是设备投资增加。
Multiple evaporation capacity is in positive ratio with heating transfer capacity. Only steam will be saved under multiple evaporation, evaporation capacity will not be increased and equipment investment will be increased.

3、应用范围Application

1)蒸发浓缩evaporation and concentration
2)蒸发结晶evaporation and crystallization
3)低温蒸发low temperature evaporation

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