What are the causes of scaling in plate heat exchangers?
(1) The heating system generally uses untreated tap water containing a large amount of scale ions such as Ca2+Mg2+.These scale-forming ions are easily precipitated from the metal surface of the boiler, heat exchanger and pipe network to form scale when the water temperature rises or evaporates and concentrate
(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, adheres 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 attack 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 slimming can also cause scale erosion and microbial attack on metals.