摘要
高浓度煤粉燃烧是一种新型的洁净煤燃烧技术,具有高效低污染排放特性。在一维火焰炉与固定床反应器实验台上,对不同煤种、粒径、炉温在不同煤粉浓度下燃料N的释放特性进行了实验研究。实验结果表明:煤种不同,燃料N的释放特性差异明显。挥发分越高,燃料N最大释放率对应的煤粉浓度越低;煤粉粒径越小,燃料N在不同煤粉浓度下的释放率越高;炉温越高,燃料N越容易释放,燃料N主要以挥发分N的形式释放出来。随着煤粉浓度的递增,NOx转化率与燃料燃尽率均呈单调递减趋势,高浓度煤粉燃烧有利于低NOx的排放,但煤粉浓度过高,对煤粉的燃尽不利。在高浓度煤粉燃烧过程中,煤粉与空气的充分混合及合理选取过量空气系数至关重要。
The high pulverized coal concentration combustion was a new clean combustion technology with high efficiency and low pollution emission. The experiments of fuel-N release characteristics under the different coal species and particles diameter as well as furnace temperature were carried out in the one-dimensional drop-tube furnace and the fixed bed reactor, the experimental results show that the release characteristics of fuel-N is very different under the different coal species. The higher the volatile content in the coal is, the lower the pulverized coal concentration for the highest release rate of fuel-N is, and the smaller pulverized coal particles diameter is very helpful for the release of fuel-N under the different pulverized coal concentration. Moreover, the fuel-N is easy to release from the coal under the high furnace temperature, and the fuel-N is mostly released by the volatile-N from the coal. With the increase of the pulverized coal concentration, both the NOx conversion rate and the burnout rate of pulverized coal particles take on the trend of linear decrease, and it is very favorable for the decrease of NOx emission under the high pulverized coal concentration, but it is adverse for the burnout of pulverized coal particles under too high pulverized coal concentration. It is very important for the full blend of pulverized coal particles and air as well as the optimal selection of excess air ratio during the high pulverized coal concentration combustion.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2011年第8期25-30,共6页
Proceedings of the CSEE
关键词
一维火焰炉
高浓度煤粉
燃料氮释放
NOx转化率
燃料燃尽率
one-dimensional drop-tube furnace
highpulverized coal concentration
fuel-N release
NO~ conversionrate
fuel burnout rate
