关于低氮燃烧器掺烧不同煤质的改造

A Study on the Reform of the Low-nitrogen Burner Adopting Blended Combustion with Different Types of Coal

对东锅DG1025/18.2-Ⅱ4型锅炉所配备的百叶窗式水平浓淡燃烧器进行改造,采用分层燃烧技术,保留原主燃烧区域基本格局不变,一次风喷口采用宽钝体大回流式垂直浓淡燃烧器;增大底部AA层二次风喷口,使托粉能力增强;将Y层三次风下移到C、D两组燃烧器之间,将三次风中携带的煤粉送入主燃烧区域的高温区域;在A层燃烧器区域增加微油点火装置;在三次风附近低温区域布置适量卫燃带,优化煤粉燃尽条件,并保证主、再热蒸汽气温。改造后锅炉效率提高了2.52%,且锅炉运行正常。

This essay introduces the reform of the louver-type horizontal dense-dilute burner which is equipped for the DG1025/18.2-Ⅱ4 boiler produced by Dongfang Boiler Group Co. , Ltd.. To retain the basic pattern of the original main combustion zone, the stratified combustion technology was used, and the wide-bluff-body-big-backflow-type vertical dense-dilute burner was used in the primary air spout. The secondary air spout on AA stratum was enlarged to increase its coal powder capacity. The tertiary air on Y stratum was moved down between burner C and burner D, and the coal powder carried by it was sent to the high-temperature area of the main combustion zone. Micro-oil igni- tion devices were increased in the combustion zone of A stratum. Appropriate amount of refractory belts were ar- ranged in the low-temperature zone near the tertiary air, to optimize the after-combustion condition of the coal pow- der as well as ensuring the temperatures of both main-heat and reheat steam. The boiler efficiency has increased by 2.52% after the reform and the boiler is operating well.