rising film evaporator

Rising film evaporator: Product overview and features: This type of evaporator requires careful design and operation, that is, the secondary steam in the heating tube should have a higher speed and a higher heat transfer coefficient, so that the material liquid can pass through the heating tube once Meet predetermined concentration requirements. Normally, under normal pressure, the speed at the outlet at the upper end of the pipe should be maintained at ~/. During decompression operation, the speed can reach ~/. The rising film evaporator is suitable for handling solutions with large evaporation volume, heat sensitivity, low viscosity and easy foaming, but it is not suitable for solutions with high viscosity, crystal precipitation and easy scaling. Compared with the falling film evaporator, the installed power is relatively small.
Working principle: The heater is composed of a heat exchange tube and a shell, and the heating chamber of the rising film evaporator is composed of a vertical long tube bundle. Usually the heating pipe diameter is ~, and the ratio of pipe length to pipe diameter is ~. After the raw material liquid reaches the boiling point or is close to the boiling point after being preheated, it is introduced from the bottom of the heating chamber, driven by the high-speed rising secondary steam, and evaporates while flowing along the inner wall of the heat exchange tube. The required concentration can be reached at the top of the heating chamber, and the liquid is completed. It is discharged from the bottom of the separation chamber, and the secondary steam generated passes through the upper separation plate group to remove bubbles, water droplets, and debris and becomes the next heat source.