Demonstration of Anti-Scale Corrosion Resistant Coatings for Hot Water Heat Exchangers

摘要

Army facilities commonly use domestic hot water heat exchangers. Recurrent fouling of heat exchanger tube bundles reduces the thermal efficiency of these systems to the point of failure. Common maintenance practices to sustain acceptable exchanger function are costly, labor intensive, and can involve hazardous chemical and waste handling issues. The use of phenolic coatings on heat exchangers has been found effective in providing maintenance- free extension of service life for these systems. This study evaluated long-term field demonstrations at several locations on the application of phenolic coating technology. The study found that: (1) the phenolic based coating system maintained the hot water delivery temperatures at or above 140 def F in both scaling and corrosive fouling waters; (2) the coated heat exchangers eliminated the need for 90-day acid cleaning cycles to remove the scale buildup on uncoated tubes for 4.5 yr; (3) the simple payback for using phenolic based coating technology on heat exchangers at two test locations was less than 2 yr.