大同烟煤空气分级燃烧NO_x生成特性的试验研究  

Experimental Research on NO_x Emission of Datong Bituminous Coal in Air-staged Combustion

作　　者：蒋信[1] 范卫东[1] 赵达[1] 曹伟[1] 

机构地区：[1]上海交通大学机械与动力工程学院,上海200240

出　　处：《锅炉技术》2016年第1期54-58,共5页Boiler Technology

摘　　要：在20kW下行燃烧炉上进行大同烟煤的空气分级燃烧试验研究,研究了影响空气分级燃烧效果的因素和NO_x的生成与还原路径,分析了不同工况下的飞灰的残余氮含量。结果表明:在不分级燃烧条件下,NO_x的生成量随着过量空气系数的增加而增大,在控制总过量空气系数的条件下,通过提高分级深度或者推迟燃尽风的投入能够进一步降低NO_x生成,但这种降低程度存在上限。空气分级燃烧过程中存在明显的挥发分氮还原现象,同时焦炭氮的析出也受到抑制。Experiments were carried out on a 20 kW down fired combustor with Datong bitu- minous coal to study the impact parameters of air-staged combustion, and investigated the NO; formation and reduction path. Residual nitrogen in fly ash was also researched in this paper. The results indicated that in unstaged combustion, NOx emission increased with the in- creasing of excess air ratio. When fixed the total excess air ratio, by increasing staging level or delay over fire air＇s position, NOx emission decreased, but there is a limit of this effect. In air-staged combustion, volatile-N reduction appeared as well as the char-N release was inhibited.

关 键 词：空气分级 氮氧化物 焦炭氮 残余氮 

分 类 号：TQ534.9[化学工程—煤化学工程]