What Causes Fouling In Heat Exchangers?
(1) Generally, the heating system uses untreated tap water containing a large amount of scale ions such as Ca2+Mg2+. These scale ions are easily precipitated from the water and deposited in the boiler and heat exchanger when the water temperature rises or evaporates and concentrates. Scale is formed on the metal surface in the pipe network.
(2)After the sediment in the water and various microbial microorganisms enter the water system, the temperature is suitable for the growth and reproduction of the microorganisms, so that a large amount of microbial slime is generated in the system, attach to the radiator tube, and is mixed with the scale to form a biological dirt.
(3)Dissolved oxygen and salts in the water can cause oxygen and chemical attack on the metal material of the heating system. Because the heating system is composed of a variety of materials containing a large amount of electrolyte salts, the formation of galvanic and erosive batteries between different metals, resulting in electrochemical erosion of the system metal. Fouling and biological slime can also cause scale erosion and microbial attack on the metal.