Water cooler heat exchanger
Thread Content
In the atmospheric and vacuum distillation unit, the electrostatic dehydrator water cooler has its cooling water return flow increased due to the high temperature during electrostatic dehydration; however, the temperature does not decrease. Why does the temperature drop after turning off the return water? ? ? Is it also because a film is formed? ?
When you cut off the water flow, oil is definitely present; when this oil comes into contact with the tube bundle, waxing occurs. By reducing the flow rate of the circulating water, the water temperature rises, which reduces the waxing and thus improves the heat exchange efficiency, so the temperature drops. If the issue of oil in the cut water stream cannot be resolved, the only option is to adjust the circulation water flow to find an appropriate level
It is possible that the temperature of the heat exchanger tube wall happens to be the waxing temperature at which oil is discharged along with water, resulting in the formation of a wax layer on the tube wall and thereby affecting heat transfer. By reducing the flow rate of the circulating water, the water temperature rises, which is equivalent to using hot water for cooling and prevents the formation of a film; as a result, the heat transfer efficiency is improved. This phenomenon is also commonly encountered in the cooling of other waxes and condensates with high freezing points, requiring a hot water system for cooling.