Fouling of heat exchanger

The probability of heat exchanger generally appear in the refinery is high, because we are often used in refinery plant decompression cooling equipment, because the processing of fouling of heat exchangers every year to spend money, there are some serious problems even affect the safety of production, so we should classify the scaling.
According to the deposition mechanism of the fouling layer, the dirt can be divided into: particle fouling, crystallization fouling, chemical reaction fouling, corrosion fouling, fouling, etc..
1, particle fouling: heat exchange surface area of the solid particles. This dirt, including the formation of a large solid particles in the horizontal heat transfer surface layer, in fact, the deposition of dirt and other colloidal particles.
2, crystallization of dirt: in the heat transfer surface of the inorganic salt crystallization of the formation of the sediment, is generally in the saturation or cooling occurs.
3, chemical reaction fouling: due to the chemical reaction of dirt, the heat transfer surface material is not involved in the reaction, but he still can be used as a catalyst for chemical reaction.
4, because of material corrosion fouling on heat corrosion of surface corrosion and dirt, usually by the composition, temperature and corrosion degree by treatment of fluid pH value.
5, biological dirt: the general biological fouling is refers to the microbial dirt. He will produce clay, but the slime also provides conditions for the reproduction of dirt, which he is very sensitive to temperature, as long as the appropriate temperature, can produce a considerable thickness of dirt layer.
6, solidification fouling: due to the formation of fouling on the heat transfer surface.
If you want to prevent scaling, we should consider three issues to prevent fouling formation, to prevent bonding between the material and the deposition of heat transfer surface, remove sediment from the surface of heat transfer. Do these three points, then the scaling should not be generated.