蒸发技术 自然循环蒸发器

管长较短的垂直壳管式热交换器,横向分离机布置在顶部。

操作

要浓缩的液体在底部供应,并通过“气举泵”或升膜原理上升到加热管顶部。

Due to the external heating of the tubes the liquid film on the inside walls of the tubes starts to boil releasing vapor. The liquid is carried to the top of the tubes as a result of the upward movement of the vapors formed. The liquid is separated from the vapors in the downstream separator and flows through a circulation pipe back into the evaporator, ensuring stable and uniform circulation.

The larger the temperature difference between the heating chamber and the boiling chamber, the greater the intensity of evaporation and, consequently, the liquid circulation and heat transfer rates.

Where the boiling chamber of the circulation evaporator is divided into several separate chambers, each one equipped with its own liquid circulation system, the heating surface required for high final concentrations can be considerably reduced compared to an undivided system based on the same evaporation rate.

The final concentration is only reached in the last chamber. In other chambers, the heat transfer is considerably higher due to the lower viscosities and boiling point elevations.

 

特殊特性

快速启动、比容量较大 - 由于加热管(1-3 米)的长度相对较短、直径相对较小,因此蒸发器的液体含量非常低。

应用领域

  • 蒸发对高温不敏感的产品(需要较大的蒸发比)。
  • 很有可能产生积垢的产品和非牛顿流体产品,即高速度可能会降低表观粘度。
  • 具有几个沸腾舱室且分离机安装在顶部的循环蒸发器可以作为高浓缩机。