低挥发分煤粉燃烧新技术发展与应用

介绍了国内外低挥发分煤粉燃烧技术及发展。对具有代表性的燃烧器及炉膛结构进行简要分析，说明热回流、煤粉浓缩、延长火焰长度等关键技术在实现低挥发分难燃煤粉快速着火、稳定燃烧中的应用。指出尽管燃烧器在应用中取得一定的效果，但仍然存在一些问题，因而对于低挥发分煤种还需要同时选择合理的燃烧方式，如切向燃烧、对冲燃烧、W型火焰燃烧及CUF火焰燃烧等技术。其中，W型火焰燃烧方式对难燃无烟煤的燃烧稳定性优于四角和对冲燃烧方式，是目前主要采用的燃烧结构。高温空气燃烧技术对低挥发分煤具有火焰稳定、热效率高、再循环分级燃烧，低NOx排放等优点，将成为更有前景的燃烧技术。

Development and application of low volatile pulverized coal combustion technique

Introduce the development and application of low volatile pulverized coal combustion technique.The representative burners and framework of boilers were demonstrated and the key techniques,including strengthening hot gas back flow,keeping adopting pulverized coal concentration,and extending length of flame,were also analyzed and these techniques can help pulverized coal ignite quickly and keep stable ignition.The suitable combustion system should be strictly chosen for low volatilization pulverized coal,such...