고효율 화염 안정형 접선식 석탄 버너 개발

• Published in: 한국연소학회지 Vol. 11; no. 2; pp. 1 - 6
• Main Authors: 김혁필, 김상현, 김혁제, 송시홍, Kim, Hyeok-Pill, Kim, Sang-Hyeun, Kim, Hyuk-Je, Song, Si-Hong
• Format: Journal Article
• Language: Korean
• Published: 한국연소학회 01.06.2006
• Subjects: 기계공학; Tangential Coal-Fired Burner; HPFS(High Performance & Flame Stability); Unburned Carbon; Ignition; Flame Stability
• ISSN: 1226-0959; 2466-2089

This report presents a study of the development of an advanced coal nozzle used in burners to reduce unburned carbon (UBC) in a tangential coal-fired boiler. To understand the mechanism of UBC reduction, experiments using conventional burners were carried out to evaluate the effects of air injection velocity, coal fineness and over fired air (OFA) on combustion efficiency. It was confirmed that ignition of pulverized coal particles close to the burner is helpful toward the complete burn of residual carbon in fly ash. These efforts indicated the additional results that UBC was strongly dependent on the primary air velocity and coal fineness; especially that UBC dramatically decreased when the weight fraction of pulverized coal under $75{\mu}m$ was over 85 %. New coal nozzles, modified from conventional nozzles, were prepared and tested to improve the combustion efficiency. Some of these nozzles offered relatively lower unburned carbon than those of conventional burners and are referred to as HPFS (High Performance Flame Stability) coal nozzles.