Chemical cleaning

Chemical cleaning is the title for all kinds of cleaning of water steam cycle components by chemicals.

Operational chemical cleaning means the removal of scale which has been generated during operations as the result of physical or chemical reactions.

Chemicals include solvents such as acids, alkalis, inhibitors, complexing agents, surfactants, oxidizing agents, etc. All these components will be mixed within demineralized water.

Before any successful operational clean, it is mandatory to know about the scale and the adhesion mechanism. In the most ideal case, tube samples can be investi­gated in the laboratory to chose the best cleaning solvent.

Usually the operational cleaning is applied by the circulation method but in special cases such as the cleaning of economizers and evaporators of Benson-style boilers the "once through" method might be the best choice.