Study on descaling characteristics of an induction-type electronic descaling device outside the heat transfer tubes of evaporative cooler

摘要

Highlights？The effect of descaling device to fouling resistance outside tubes is investigated.？Paper focus on the surface where spray water evaporate into air.？The microstructure of the dirt sample is analyzed by SEM.？The reason for “secondary descaling” is given.？Giving reason for descaling effect reduced sequentially in each descaling stage.AbstractUnder actual operating conditions, a closed cooling tower was simulated and an experimental study conducted to determine the descaling characteristics of an induction-type electronic descaling device on the spray water side of an evaporative cooler. After a long period of experimental observation and analysis, the results show that: an induction-type electronic descaling device on the outside of the heat pipe can accelerate the dissolution of dirt and reduce fouling resistance. During the 160h of the experiment, reduction of fouling resistance occurred several times. At the end of each descaling stage, the fouling resistance was reduced by 20.35%, 3.27% and ？0.22% compared with the fouling resistance at the beginning of the experiment. SEM (Scanning Electron Microscope) revealed that the dirt crystal was primarily block structure, the dense layer was thin and the overall structure was loose.]]>