Onix - Cyclonic Combustion furnaces
From Solid Fuel Combustion Systems
Cyclonic furnaces have become a major alternative to conventional burners. Applications include both large scale utility boilers and industrial processes where renewable energy can be recovered profitably. The ONIX Corporation Series Solid Fuel Burner is operated by the method of “cyclonic combustion.” In cyclonic combustion, the burning occurs at a positive pressure rather than the slight negative pressure associated with most suspension fired solid fuel systems.
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Cyclonic combustion occurs in specially designed cylindrical reactors which discharge hot gaseous combustion products directly into the downstream process. Pulverized wood is blown into the cyclonic burner where it oxidizes immediately. Centrifugal action forces the unburned particles toward the cylindrical wall of the burner where char oxidation occurs. Very high turbulence is generated in the cyclonic burner and char oxidation occurs within milliseconds.
Combustion intensity in cyclonic burners is considerably higher than combustion intensity in conventional wood suspension fired furnaces. The vigor of the cyclonic action forces the wood particles to the burner wall, facilitating not only rapid combustion but also solid product classification. Cyclonic burners typically remove 99% of the solid products of combustion. These solid products of combustion, which are too small to be visible, are entrained into the air stream and then enter the downstream process where they are removed as fly ash by a particulate control system.
This solid fuel system is designed for a wood fuel having a “normal size distribution” with a 1/4″ maximum particle size, a lower heating value of 7,500 Btu/lb or greater, an ash content of 6% or less, a moisture content of 10% or less, and a consistent density of 10-25 pounds per cubic foot.
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