working principle The structure of the rising film evaporator is that the liquid enters the heating pipe according to the principle of the siphon pump, and the liquid and the steam are separated after flowing into the separator, and flows back to the coke generator through the circulation pipe to form a closed circuit. Therefore, the evaporator is formed. Also known as the external circulation device. The evaporator is selected. If the evaporation amount is large, a multi-effect device can be used to save steam. Reduce energy consumption. The heating pipe is composed of a heat exchange tube. After the preheating reaches the boiling point or close to the boiling point, the raw material liquid is introduced from the bottom of the heating chamber, and is driven by the secondary steam rising at a high speed, and evaporates along the inner wall of the heat exchange tube, and is at the top of the heating chamber. The concentration of the enthalpy is reached, and the finished liquid is discharged from the bottom of the divided chamber, and the generated secondary steam is disposed in the upper separation plate group to remove the bubble water droplets and the impurities become the next heat source. The evaporator is suitable for treatment. A weak liquid with a large amount of evaporation and a heat-sensitive or foam-prone solution. Its use is widely used in petroleum, chemical, pharmaceutical, fertilizer, paper, aluminum industry, MSG, wine, sugar and other fields. Device Description After the raw material liquid is preheated, it enters the heater tube from the bottom of the evaporator, and the heated steam condenses outside the tube. After the original liquid of the province is heated, boiling vaporization produces secondary steam rising at high speed in the tube, which drives the liquid to flow upward along the inner wall of the tube, and evaporates continuously to accelerate the flow. The gas-liquid mixture enters the separator and separates. The finished liquid is discharged from the bottom of the divider. Such an evaporator needs to be carefully designed and operated, that is, the secondary steam in the heating pipe should have a higher speed and a higher heat transfer coefficient, so that the liquid once passes through the heating pipe to reach a predetermined concentration requirement. Generally, under normal pressure, the speed at the outlet of the upper end of the pipe should be maintained at 20-50 m/s. When the pressure is reduced, the speed can reach 100160 m/s. Scope of application The rising film evaporator is suitable for treating solutions with large evaporation, heat sensitivity, low viscosity and easy foaming, but it is not suitable for solutions with high viscosity, crystal precipitation and easy scaling.