High Temperature Corrosion of Water Cooling Wall of Extrasupercritical Units

The basic status of high temperature corrosion of water cooling wall of the first domestic extrasupercritical (ESC) units is introduced.A water cooling wall tube was analyzed by means of macroscopy inspection,metallograpy analysis and EDS.The results showed that there was high temperature sulfur corrosion on outside surface of the water cooling wall tube.The corrosion reasons are discussed,and some prevention measures are presented.