基于DBEL技术超临界“W”火焰锅炉狭缝式燃烧器煤粉着火燃烧特性研究

Study of the Ignition and Combustion Characteristics of Pulverized Coal in the Slit Type Burners of a Supercritical “W ”-shaped Boiler Based on the DBEL Technology

针对国产首台基于DBEL(空压蝶式制动器)技术600 MW级超临界"W"火焰锅炉运行中存在的问题,对其新型狭缝式浓淡分离燃烧器煤粉着火燃烧特性开展了相关试验研究,结果表明:新型狭缝式浓淡分离燃烧器中淡相着火较差、浓相稳燃特性受燃烧器配风影响较为敏感,两者是造成锅炉运行效率低和下炉膛安全性差的主要原因。

In the light of the problems existing in the first domestically-made 600 MW class supercritical W-shaped flame boiler based on the DBEL technology during its operation,experimentally studied were the ignition and combustion characteristics of pulverized coal in the novel slit type bias separation burner. The test results show that the ignition of the sparse phase in the burner is relatively poor and the combustion stabilization characteristics of the dense phase are susceptible to the air distribution of the burner. Both constitute the main causes for a low operation efficiency and the poor safety of the lower furnace. The test results can offer a certain theoretical basis and guide for operation and retrofitting of supercritical W-shaped flame boilers in operation in China,including new boiler design and development.