Importance

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Abstract

Method for reducing a formation of nitrogen oxide on a primary side of a furnace and reducing or avoiding nitrous oxide and ammonia slip in an offgas of the furnace in which a fuel is burned in a combustion process having at least two stages. The method includes passing a fuel consecutively through each of a plurality of bed areas of a combustion bed of the furnace. A primary gas including oxygen is fed individually to each of the bed areas so as to burn the fuel in the combustion chamber of the furnace. A secondary gas including oxygen is introduced into a downstream offgas burn-out zone, so as to after-burn incompletely burned offgas components formed during the burning of the fuel. Partial offgas streams from the combustion bed areas are axially mixed by injecting a water-gas mixture as at least one free jet above a surface of the combustion bed upstream from the downstream offgas burn-out zone so that the at least one free jet penetrates the partial offgas streams of the combustion bed areas to reduce a heating value of the offgas between the surface of the combustion bed and the downstream offgas burn-out zone.

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First Claim