Colmonoy 88 for Waste to Energy Plants
Over three years ago, a large waste-to-energy plant performed the first large-scale test of a Colmonoy spray-and-fuse alloy. They had an experienced job shop overlay 86 boiler tubes using Colmonoy 88. The tubes were coated 25 feet in length and 2.5" in diameter. Tube-metal temperatures approached 900 F, and the boiler ran 24/7. The tubes are vital components of a superheater in one of the boilers, and a way of protecting the tubes to extend their life from, at best, a one year cycle was needed.
Colmonoy 88 extends boiler tube life, especially in the secondary superheater section of a boiler where the most severe environment exists for mass burn and refuse derived fuel boilers. Boiler-tube life is one year or less in soot blower lanes, where soot blower lances clean the front and back ends of superheaters.
Colmonoy 88 offers four distinct advantages for superheater tubes and panels:
o Longer life than tube shields, stainless tubes, or any type of Inconel overlay including Inconel 625, 622, 52 and 72.
o Improved high temperature erosion properties compared with other alloys tested.
o Reduction of molten salt or slag build-up on the tubes.
o Better heat transfer properties than shielding or overlays.
o Reduced maintenance costs via labor and material savings.
Through extensive field tests in superheaters, Colmonoy 88 has proven superior to tube shielding, overlays, and stainless tubes.
The waste to energy plant is pleased with the test results and plans to test Colmonoy 88 in two other plants.
For further information about this application, please contact abreer@wallcolmonoy.com
Contact:
James A Nicoll IV
101 W. Girard
Madison Heights, MI 48071
Phone: (248) 585-6400, ext. 233
Fax: (248) 585-7960
Email: jnicoll@wallcolmonoy.com
