How do you deal with heat exchangers that have severe scaling?
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Everyone, how do you deal with heat exchangers that have severe scaling issues? Mainly, how is scale removal done? I’ve been in contact with electrochemistry and high-energy physics lately, as well as an imported device from Shanghai. Are these methods reliable? If anyone has useful information, please feel free to share it
You have to try it yourself to find out if it’s reliable or not. The most effective method is still to remove it and clean it with high-pressure steam.
Depending on the degree of scaling and blockage, these are the cleaning methods to be used. The blockage is too severe; the core has to be replaced.
Scale can be hard or soft. On-site cleaning of soft scale simply involves having someone use a high-pressure water gun to spray it. Hard scale, which involves calcium and magnesium ions, needs to be removed through alkaline cleaning; the specific cleaning method will be provided by the manufacturer. Here is a suggestion: if the cold side is controlled by a TIC-regulated valve, it is possible to install the cold side valve on the return side, which helps prevent scaling since the cold side of the heat exchanger is filled. For example, cooling water is used as the coolant at the cold end. The TIC should be placed at the outlet of the material on the hot side; the TV control valve in series should not be installed on the pipeline leading the cooling water into the heat exchanger, as its opening degree is likely to be very small, resulting in a low flow rate of cooling water inside the heat exchanger, which in turn leads to high temperatures and scaling. It can be placed at the cold-side water inlet, so that even when the valve opening is small, the cold side of the heat exchanger remains filled with liquid, reducing the risk of scaling.
First, identify the cause of scaling in the heat exchanger and address the problem at its root.
It is recommended to choose an online self-cleaning or non-scaling type of heat exchanger; such heat exchangers were available 30 years ago, but it seems that subsequent structural improvements and promotional efforts have been insufficient. You can search for the keyword “online spring descaling heat exchanger”.
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We all remove the heat exchanger core and clean it with a high-pressure water gun
It is recommended to add a scale inhibitor in the processing procedure; this issue will not occur in the next cycle
In the early stage, it’s a scale inhibitor; later on, it depends on the equipment itself