Corrosion inside an incinerator

[gafultz]

The primary chambers of our solid-waste incinerators are refractory-lined to withstand combustion gases at a continuous 1450 degF but the hydraulically operated rams that mix the waste periodically and the combustion air pipes are exposed to the hot gases. The rams and pipes are water-cooled (jacketed) mild steel. We would like to get more longevity from these metal parts without sacrificing strength but economy is also a consideration. The environment is sub-stoichiometric so unburned carbon and CO are always present as well as water vapor. Depending on the waste being burned there will also most likely be HCl and/or SO2 present. What type of metal would be the best application? A coating would probably not be feasible because of the high friction level of the moving parts.

 

[mcguire]

Annealing boxes for steel coils in similar environments use a grade called 253MA from Avesta-polarit rather successfully.

 

[MJCronin]

gafultz,

Have you considered contacting some of the vendors of moving grates in the "waste-to-energy" plants ?

I believe that ductile iron was used for many of the grate assemblies in the recent re-construction of a WTE plant (McKay Bay) in Tampa Florida

Try

http://www.vonroll.ch

Also see

http://www.ductile.org/dimg/pdf/Digest.pdf

See

http://www.no-burn.org/actionkit/pdf_files/gdattech.pdf

also

Let us know more details about your installation......please...

MJC