Patent ID: 8210112

Claim:
A method for improving a slag quality of slag in a grate firing system, the method comprising: providing a grate firing system including a combustion chamber disposed above a combustion bed, the combustion bed having a plurality of fixed-bed burnout zones in series on a combustion grate, the fixed-bed burnout zones including a first series of fixed-bed burnout zones and a second fixed bed burn-out zone disposed downstream of the first series; traversing the first series of fixed-bed burnout zones with a flow of oxygen-containing gas; and traversing, with a flow of a hot combustion gas from a region of the combustion chamber above the first series of fixed-bed burnout zones, a portion of the combustion bed associated with the second fixed bed burn-out zone from above and downwards through the portion of the combustion bed associated with the second fixed bed burn-out zone.