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Reduction of NOx emissions from slag-tap boilers was studied to determine whether firing control, flame stability, and refractory lining would be affected by primary NOx reduction measures.Although burnout was reduced in the cyclone under low-NOx firing, it was almost complete in the secondary chamber; the low NOx operation did not contribute to corrosion, slagging, and contamination; which was due to use of SiC refractory materials in the boiler.Furnace-related measures (e.g., reduced air coefficient, flue gas recirculation, and staged fuel feeding) reduced the NOx emissions to 800-1000 mg/m³ when firing bituminous coal.Further possibilities for NOx reduction under conditions of staged fuel feeding and flue gas recirculation involved injection of secondary fuel into the secondary chamber or into the area of the slag screen; by doing so, a reduction zone was established in which NOx present in the flame were substantially decreased.

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