As we all know, heat exchangers are very common in our lives. Due to their functional advantages, they are widely accepted by many users. Today, we will focus on the spiral wound tube heat exchanger. During its operation, impurities contained in the fluid will cause many deposits to adhere to the inner walls, which affects its performance. How to solve this problem?
Fouling is most severe in the cooling water channels of spiral wound tube heat exchangers, while relatively little fouling occurs in the lean oil channels. Therefore, the key step is to clean the scale in the cooling water channels.
1. Flushing
Before acid cleaning, first perform an open flushing of the heat exchanger to remove impurities such as sludge and scale from its interior. This not only improves the effectiveness of acid cleaning but also reduces the acid consumption. Pour the cleaning solution into the cleaning equipment, and then inject it into the heat exchanger.
2. Acid Cleaning
Allow the heat exchanger, which is fully filled with the acid solution, to soak statically for 2 hours, followed by continuous dynamic circulation for 3–4 hours. During the circulation period, perform alternating forward and reverse cleaning every 0.5 hours. After the acid cleaning process is completed, if the pH value of the acid solution is greater than 2, the acid solution can be reused.
3. Alkaline Cleaning
After acid cleaning, conduct alkaline cleaning on the heat exchanger through dynamic circulation. This step aims to achieve acid-base neutralization and prevent corrosion of the heat exchanger tubes.
4. Water Rinsing
After alkaline cleaning, rinse the heat exchanger repeatedly with clean softened water for 0.5 hours to thoroughly flush out residual residues inside the heat exchanger.
During the descaling process of the spiral wound tube heat exchanger, the time taken for each step should be strictly recorded to verify the cleaning effect.
In addition to spiral-wound tube heat exchanger, GNEE also offers more high-quality products, such as shell-and-tube heat exchangers, copper heat exchangers, titanium heat exchangers, heaters, chlorine coolers, high-pressure reactors, LPG storage tanks, cryogenic storage tanks, VPSA oxygen generators, etc. If you are interested in the above products or other products, please feel free to send an email to sales@gneeheatex.com, and our professional team will be happy to answer your questions.