Pulverized coal combustion in air and in O2/CO2 mixtures with NOx recycle
Pulverized coal combustion in air and in O2/CO2 mixtures with NOx recycle
复制标题
DOI：
10.1016/j.fuel.2005.04.028
复制
发表时间：
2005-11
期刊：
影响因子：
7.4
通讯作者：
Hao Liu;Ramlan Zailani;B. M. Gibbs
中科院分区：
文献类型：
--
作者：
Hao Liu;Ramlan Zailani;B. M. Gibbs
本文介绍了在一台20 kW立式燃烧器上进行的煤粉在空气和O_2/CO_2混合气中燃烧并伴有NOx再循环的试验研究结果。对7种国际烟煤在空气和O_2/CO_2混合气中的燃烧性能和NOx排放的实验结果证实了作者的研究结果，即O_2/CO_2混合气中的O_2浓度必须大于30%，才能产生与煤-空气燃烧相匹配的温度分布，而煤在30%O_2/70% O_2混合气中燃烧时，与空气中燃烧相比，CO2的燃烧效果更好，NOx的排放量更少。NOx再循环实验结果表明，NO再循环量的减少与燃烧介质、燃烧方式（分级或非分级）和再循环位置有关。在30%O_2/70%CO_2条件下燃烧煤比在空气中燃烧煤还原NO的能力强。在空气和30%O_2/70%CO_2条件下，煤燃烧可分别降低88%和92%的NO回收率。当NO通过燃烧器再循环时，与没有氧化剂分级相比，具有氧化剂分级的NO被减少更多。当NO再循环通过燃烧器时（从65%到92%）比当NO再循环通过分级三级氧化剂端口时（从33%到54%）减少更多的NO。循环NO浓度对燃烧介质空气和30%O2/70%CO2的循环NO还原效率影响不大。
This paper presents experimental results of a 20kW vertical combustor equipped with a single pf-burner on pulverised coal combustion in air and O2/CO2mixtures with NOxrecycle. Experimental results on combustion performance and NOxemissions of seven international bituminous coals in air and in O2/CO2mixtures confirm the previous findings of the authors that the O2concentration in the O2/CO2mixture has to be 30% or higher to produce matching temperature profiles to those of coal-air combustion while coal combustion in 30% O2/70% CO2leads to better coal burnout and less NOxemissions than coal combustion in air. Experimental results with NOxrecycle reveal that the reduction of the recycled NO depends on the combustion media, combustion mode (staging or non-staging) and recycling location. Generally, more NO is reduced with coal combustion in 30% O2/70% CO2than with coal combustion in air. Up to 88 and 92% reductions of the recycled NO can be achieved with coal combustion in air and in 30% O2/70% CO2respectively. More NO is reduced with oxidant staging than without oxidant staging when NO is recycled through the burner. Much more NO is reduced when NO recycled through the burner (from 65 to 92%) than when NO is recycled through the staging tertiary oxidant ports (from 33 to 54%). The concentration of the recycled NO has little influence on the reduction efficiency of the recycled NO with both combustion media—air and 30% O2/70% CO2.