CAJ | 학술논문

在基于循环流化床预热的无烟煤粉燃烧实验台上，在循环流化床空气当量比低于0.3的条件下对无烟煤粉在预热过程中煤氮的迁移和转化特性进行了研究．结果表明，煤氮的主要转化产物为 NH3和 N2；随着煤中挥发分含量的升高和煤阶的降低，煤氮的转化率和煤氮向 N2的转化率增加；随着预热温度的升高，煤氮的转化率和煤氮向 N2的转化率增加，预热生成的 NH3质量浓度降低；随着循环流化床空气当量比的增加，煤氮的转化率和煤氮向N2的转化率增加，预热生成的 NH3的质量浓度降低．煤氮向 NH3和 N2的转化反应以及 NH3和 N2之间的转换反应是决定无烟煤预热过程中煤氮迁移转化的主要热化学反应．
재기우순배류화상예열적무연매분연소실험태상，재순배류화상공기당량비저우0.3적조건하대무연매분재예열과정중매담적천이화전화특성진행료연구．결과표명，매담적주요전화산물위 NH3화 N2；수착매중휘발분함량적승고화매계적강저，매담적전화솔화매담향 N2적전화솔증가；수착예열온도적승고，매담적전화솔화매담향 N2적전화솔증가，예열생성적 NH3질량농도강저；수착순배류화상공기당량비적증가，매담적전화솔화매담향N2적전화솔증가，예열생성적 NH3적질량농도강저．매담향 NH3화 N2적전화반응이급 NH3화 N2지간적전환반응시결정무연매예열과정중매담천이전화적주요열화학반응．
Experimental studies were carried out on a test rig of pulverized anthracite coal combustion preheated by a circulating fluidized bed(CFB). The anthracite was preheated in the CFB with excess air ratio less than 0.3,and coal nitrogen transformation characteristics during the preheating process were investigated. It is found that coal nitrogen mainly transforms into NH3 and N2. The coal nitrogen conversion rate and the conversion rate of coal nitrogen into N2 increase with the increase in volatile content and decrease in coal rank. With the increase in preheating temperature and excess air ratio in the CFB,the concentration of NH3 generated during preheating process decreases while the coal nitrogen conversion rate and the conversion rate of coal nitrogen into N2 increase. The transformation of coal ni-trogen into NH3 and N2,and the conversion reaction between NH3 and N2 are the main thermal-chemical reactions which determine the transformation of coal nitrogen during anthracite preheating process.