NITROGEN OXIDE REDUCTION BY GASEOUS FUEL INJECTION IN LOW TEMPERATURE, OVERALL FUEL-LEAN FLUE GAS

摘要

A process and apparatus for combustion of a solid carbonaceous material, for example coal, in which a mixture of the solid carbonaceous material and combustion air is injected into a combustion chamber and ignited, thereby forming a fuel-lean primary combustion zone. A gaseous fuel is injected into the combustion chamber in a region downstream of the primary combustion zone, thereby forming a fuel-lean secondary combustion zone. Temperature in the secondary combustion zone is in the range of about 1800 DEG F to 2400 DEG F.