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Control Condensate-system corrosion by following these chemical recipes
Daniel M. Cicero
Nalco Chemical Co.
The value of condensate
A well-controlled boiler system should have condensate that is low in dissolved solids. Corrosion products such as iron and copper contribute to the deterioration of equipment and negatively impact boiler efficiency. When properly treated, condensate returned to the boiler can be a valuable resource. Aside from its high purity, it also has high heat content. Thus, an improvement in the quality of condensate returned to the boiler boosts efficiency and reduces operating costs. Condensate temperatures are typically 180° F or greater. With a heat value of 148 Btu/lb (relative to a 32°F base at this temperature), condensate requires less energy to convert to steam. The "free" Btus contribute to lower overall energy requirements and operating costs. Amine compounds are commonly used today to control condensate-system corrosion. These compounds generally fall into two different categories - neutralizing amines and filming amines. Amine treatments vary, depending on the type of corrosion in the system.