PULVERIZED COAL BURNER

摘要

The present invention provides a pulverized coal burner suitable for lowering the concentration of nitrogen. The pulverized coal burner of the present invention comprises a pulverized coal nozzle for jetting a mixture of pulverized coal and primary air, a secondary air nozzle and a tertiary air nozzle, concentrically arranged around the outer periphery of the pulverized coal nozzle, and a tube expanded portion at the end of a partition wall separating two adjacent air nozzles. A flow shift means, such as a guide plate, is provided for shifting the secondary air in the secondary air nozzle and causing the air to flow along the tube expanded portion. The secondary air is jetted outward by the guide plate, thus causing the mixing of the secondary air and the tertiary air with pulverized coals to be delayed, and the occurrence of NOx to be decreased.