What is fouling in heat exchangers? Part-2

 What is fouling in heat exchangers?


Crystallization:

      Crystallization usually occurs in streams of cooling water containing dissolved sulphates and carbonates. As the solubility of these salts decreases as the temperature rises, it tends to precipitate on the heat transfer surfaces when the water is heated and forms scale. This type of pollution can be reduced by limiting the temperature of the exhaust water to a maximum of 110–125◦F.


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Dissolution:

Some organic compounds can decompose when heated or come in contact with a hot surface and form carbonaceous deposits, such as coke and tar. In cracking furnaces, the goal is the partial decomposition of the hydrocarbon feedstock and the formation of coke is an undesirable but inevitable result.


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