1. Mud dirt, medium adherents such as food, etc. non-adhesive dirt.
A. Generally, cooling water contains impurities, if it is “open water sources”, there must be a certain amount of sand and mud. Such impurities will adhere to the plates after entering the plate heat exchanger, but the adhesion is not strong, which could be rinsed with water. And high-pressure water gun should be your first choice, which is simple and quick, and there is no obvious requirement for water quality and temperature, just use tap water.
B. For the plate heat exchangers applied in such as milk, juice, beer, beverages and other food fields, the medium is easy to adhere to the plates, and the adhesion is slightly strong. For this type of heat exchanger, high-pressure water guns can be used for flushing, besides that, you could also use CIP .
The main components of scale are calcium carbonate, calcium sulfate, magnesium hydroxide and so on. After the scale is formed, it adheres to the board, and it is difficult to wash and remove. So, chemical cleaning is required. Utilizing the principle that carbonate can react with acidic solution, soaking with acidic cleaning agent, and then washing, can well remove stubborn scale. After cleaning, it is necessary to conduct random inspections of the plates for penetration testing to check whether the plates have perforations, cracks, and so on.
3. Oily dirt.
Oily dirt is formed by long-term adhesion of oily medium to the plate surface. Stubborn dirt is difficult to remove by ordinary rinse. But, those plates can be soaked with a degreasing agent, combined with 25-40 degrees warm water, to remove the oil.
4. Acid-base dirt.
This type of fouling is mainly caused by long-term residues of acid and alkaline media attached to the surface of the board. We can use the principle of acid-base neutralization reaction, with the corresponding acid or alkaline cleaning solution to soak and rinse the plates to remove dirt. After cleaning, it is necessary to conduct random inspections of the plates for penetration testing to check whether the plates have perforations, cracks, and so on.