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Most of the heat exchangers are heat exchange systems with water as the heat carrier. When the temperature rises or the concentration is high, Ca(HCO3)2 and Mg(HCO3)2, which are dissolved in water, precipitate CaCO3 which is slightly soluble in water. MgCO3. The precipitated salt adheres to the surface of the heat transfer tube to form scale and adheres tightly to the surface of the heat transfer tube.
2. Particulate dirt
Solid particles suspended in a fluid system, such as sand, dust, carbon black, and dirt formed on the heat transfer surface.
3. Chemical reaction fouling
The formation of deposits between the heated surface and the fluid due to auto-oxidation and polymerization, ie chemical reactions.
4. Corrosion of dirt
Since the fluid is corrosive or contains corrosive impurities, the heat exchange surface is corroded, and corrosion products are deposited on the heat exchange surface to form dirt.
It is a kind of sticky deposit formed by the microbial population and its excreta and chemical pollutants, mud and other components adhering to the wall surface of the heat exchange tube, called biological fouling.
6. Solidified dirt
On the supercooled heat exchange surface, the high dissolved components of the cleaning liquid or multi-component solution solidify and deposit to form the dirt.