氨煤混合燃烧NO生成特性的实验研究

Experimental Study on NO Formation Characteristics of Ammonia-coal Co-combustion

氨作为一种富氢无碳含氮燃料,与煤粉混合燃烧在有效降低煤电CO_(2)排放的同时,增加了NO的生成途径。为实现氨煤低氮燃烧,该文在氨煤混燃理论燃烧放热量固定的条件下,利用高温管式炉进行氨煤混合燃烧实验探究掺氨比(0%~10%)、温度(1000~1500℃)对氨煤共燃NO生成特性的影响。结果表明,氨的掺混能够促进NO的生成与单位质量燃料NO释放量,降低燃料N向NO的转化率。随着掺氨比升高,NO的释放量逐渐增加,在同一掺氨比工况下,随着温度的升高,NO的单位质量燃料释放量先增加后降低。掺氨比为0~2%时,燃料N到NO的转化率随温度的升高逐渐降低;掺氨比为4%~10%时,燃料N到NO的转化率随温度的升高呈先增加后降低的规律;在1200℃时,各工况下转化率达到峰值。结果可为氨煤混合燃烧N转化机理提供理论支撑。

Ammonia,as a kind of hydrogen-rich and carbon-free,and nitrogen containing fuel,can effectively reduce CO_(2) emission from coal-fired power plants and increase the formation path of NO when mixed with pulverized coal.In order to achieve low nitrogen combustion of ammonia coal,this paper explores the effects of ammonia blending ratio(0%~10%)and temperature(1000~1500℃)on the NO generation characteristics of ammonia blending coal co-combustion using a high-temperature tube furnace under the condition of fixed heat release in the theoretical co-combustion of ammonia and coal.The results show that the ammonia mixing can promote the NO formation and the release of NO per unit mass fuel,and reduce the conversion rate of fuel-N to NO.With the increase of ammonia blending ratio,the release amount of NO increases gradually,and under the same ammonia mixing ratio,the release amount of NO per unit mass of fuel first increases and then decreases with the temperature increasing.When the ammonia mixing ratio is 0-2%,the conversion rate of fuel-N to NO gradually decreases with the temperature increasing.When the ammonia ratio is 4-10%,the conversion of fuel-N to NO increases first and then decreases with the temperature rising,and reaches the peak at 1200.℃This study can provide the theoretical support for the N transformation mechanism of ammonia-coal co-combustion.