Help, please! ! ! Cleaning of rust and scale from the evaporator in the chiller system.

Thread Content

Our factory is currently facing a problem: due to the insufficient capacity of the chiller system, the pressure of the chilled water inlet is too high. It is preliminarily determined that there is a blockage in the evaporator of the chiller system. Since the chilled water uses ethylene glycol as a refrigerant at a concentration of around 30%, and no corrosion inhibitors or scale inhibitors were added in the initial stage, the chilled water contains a large amount of rust, which causes blockages once it enters the evaporator of the ice machine. The evaporator of the chiller is a tubular heat exchanger (horizontal type); Freon flows through the tube side, while chilled water flows through the shell side. After removing the inlet and outlet ports on the shell side, it was found that there was a large amount of rust attached to the copper tubes in the visible areas; the condition in the areas that are not visible is unknown, but it may be even worse. I’m asking if anyone has good methods for dealing with rust and scale in the shell side, and how exactly to do it? Help.