| abstract |
A combustion chamber has refractory walls, with an input feeding biomass into the chamber, and an ignition source to ignite the biomass. Each refractory wall component, refractory brick, panel or castable, has a surface exposed to heat generated within the chamber with a thermal protective layer consisting of a thermal enhancing high emissivity coating disposed on the exposed refractory surface. The coating contains from about 5% to about 35% of colloidal silica, colloidal alumina, or combinations thereof, from about 23% to about 79% of a filler, and from about 1% to about 20% of one or more emissivity agents. |