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傳統多效蒸發器

添加時間:2018/12/18
 

傳統多效蒸發器Traditional multiple effect evaporator

1、工作原理Working principle

將幾個蒸發器串聯運行的蒸發操作,使蒸汽熱能得到多次利用,從而提高熱能的利用率,多用于水溶液的處理.
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、主要特點Main characteristics

多效蒸發流程是由多個蒸發器組合后的蒸發操作過程。多效蒸發時要求后效的操作壓強和溶液的沸點均較前效低,引入前效的二次蒸汽作為后效的加熱介質,即后效的加熱室成為前效二次蒸汽的冷凝器,僅第一效需要消耗生蒸汽。一般多效蒸發的末效或后幾效總是在真空下操作,由于各效(除末效外)二次蒸汽都作為下一效的加熱蒸汽,故提高了生蒸汽的利用率,即經濟性。
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.
多效蒸發量與傳熱量成正比,多效蒸發并沒有提高蒸發量,而只是節約了加熱蒸汽,其代價是設備投資增加。
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、應用范圍Application

1)蒸發濃縮evaporation and concentration
2)蒸發結晶evaporation and crystallization
3)低溫蒸發low temperature evaporation

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