Five factors affecting the heat transfer performance of thin film evaporators
The thin film evaporator is used as a kind of evaporation equipment. When the thin film evaporator is designed and operated, the heat transfer performance plays an important part. It can affect the stable operation of the whole thin film evaporator, energy saving effect, and affect the heat transfer performance of the thin film evaporator. What are the 5 major factors?
Five factors affecting the heat transfer performance of thin film evaporators
1. The effect of vacuum on the thin film evaporator system. The total heat transfer coefficient and evaporation intensity in the thin film evaporator increase with increasing vacuum.
2. The effect of the rotor speed of the thin film evaporator. The high speed of the thin film evaporator can effectively promote the heat exchange between the materials, strengthen the turbulence and improve the heat transfer and mass transfer performance of the thin film evaporator. In actual production, the reasonable setting of the rotating speed can improve the heat transfer performance and reduce the heat transfer performance. High power consumption due to high speed.
3. The influence of feed temperature. The total heat transfer coefficient and evaporation strength of the different feed temperatures will change again. When the material is fed near the boiling point, the heat transfer area can be better utilized. As the feed temperature increases, the total heat transfer coefficient and evaporation intensity in the thin film evaporator increase significantly.
4, the impact of the amount of feed. As the feed amount increases, the fluid in the thin film evaporator is more updated, and when the feed amount reaches a certain value, the mixing degree of the two is relatively reduced. Therefore, after the material reaches a certain flow rate, the film thickness becomes larger. The heat obtained by evaporating the surface is not enough to heat the material to the boiling temperature, resulting in less evaporation of the material and lower evaporation intensity.
5. The effect of viscosity. With the increase of viscosity, the total heat transfer coefficient K decreases correspondingly, and the evaporation intensity changes substantially in the feed amount. As the viscosity increases, the evaporation intensity increases accordingly. Thus, from the viewpoint of evaporation strength, the thin film evaporator is more suitable for evaporation of the high viscosity liquid.
July 27, 2022
