Abstract:The tertiary air of vent pulverized coal handling system has high total air flow, high humidity, low coal density and low temperature. Its layout will impact boiler combustion, fly ash and NOxemission. Based on different lownitrogen combustion improvement cases, effect of tertiary air layout to boiler outlet oxynitride emission was analyzed. The improvement plan of pulverized coal tangentially fired boiler was indicated, which could be referred by similar project.

Keywords:tertiary air, low nitrogen combustion, oxynitride