摘要
在堆积燃烧状态下采用水平管式炉反应器研究不同反应条件及燃料特性对焦炭N向NO转化的影响。试验结果表明：随着石英砂／煤焦质量混合比的增大，NO转化率起初显著增加，随后维持不变，主要由于石英砂的混入削弱了NO的二次还原反应。850～1050℃温度范围内，随着反应温度的升高焦炭NO转化率先增大后减小。2％～20％氧浓度下，1050℃进行燃烧时，10％氧浓度下焦炭NO转化率达到最大。焦炭与02的反应发生在焦炭表面时，NO还原反应减弱，NO转化率较高，同时反应温度升高到一定程度时，NO还原反应速率增加明显。煤焦表面反应煤阶和含氮量越高，焦炭NO转化率越高，并且煤焦表面含氮官能团同样影响焦炭NO的释放。
Effects of different reaction conditions and fuel characteristics on conversion of char-N to NO during coal char combustion at batch particles condition in horizontal tube furnace reactor were studied. Results show that the fractional conversion of char-N to NO firstly increases with increasing the mixing ratios sharply and then keeps quite constant which can be explained by less secondary reaction of char-NO. When the reaction temperature changes from 850 ℃ to 1 050 ℃, the fractional conversion of char-N to NO initially increases and then decreases. During the char combustion at 1 050 ℃ with oxygen concentration increasing from 2% to 20% and the conversion ratio of char-N to NO reaches a maximum at 10% oxygen concentration. When the char-O2 reaction occurs on the surface of char, higher NO conversion ratio is obtained for less secondary reaction of char-NO and when reaction temperature is up to certain value, NO reduction is apparently enhanced. Coal chars with high rank and high fuel-N content produces higher NO conversion ratio. Function groups of nitrogen on the surface of char also influence NO emission in our experiment.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2014年第23期3907-3914,共8页
Proceedings of the CSEE
基金
国家自然科学基金委创新研究群体项目(EDQQ2460102812)~~
关键词
煤焦
焦炭燃烧
固定床
焦炭NO转化率
反应温度
氧浓度
coal char
combustion
fixed bed
conversion of char-N to NO
reaction temperature
oxygen concentration
