Lowering High Temperature Corrosion Rate with Chemical Technology

Published By Fuel Tech

• By Kent W. Schulz and Ken Robbins
• Published June 2007
• 13 Page(s)

One of the most costly problems in the Waste to Energy (WTE) Industry today is the frequent replacement of superheater pendants due to chloride-induced corrosion of high temperature surfaces. As waste fuel is combusted, the highly corrosive flue gas that is generated in the boiler eventually leads to tube failures, resulting in unplanned shut downs and ultimately, all to frequent, replacement of the superheater pendants. With the exception of trying to run the boiler cooler and more efficiently, to date, it appears that the industry solutions to this vexing problem are primarily mechanical in nature. Replacement of superheater pendants with higher alloy material, cladding, shielding metal surfaces and/or using thicker walled material are common approaches, but these don't really get at the root cause of the problem. Therefore, the industry continues to look for more cost effective solutions to this problem.