焦粉粒度对烧结烟气中CO排放的影响

摘要：针对钢铁企业大气污染物排放问题，生态环境部提出了NOx、SO2、烟气颗粒物等超低排放的要求，京津冀地区在此基础上对烧结工序的CO排放浓度也做了相应要求。为探究不同粒度焦粉对烧结烟气中CO排放的影响，进行烧结杯实验，使用紫外差分烟气分析仪实时测定烧结烟气中CO浓度，并测定烧结矿的性能指标。结果表明：焦粉粒径小于1mm时，生料层透气性差，焦粉燃烧不完全，CO排放量大，随着焦粉粒径增大，制粒得到强化，生料层透气性、氧化性气氛得到改善，在焦粉粒径达到3～4mm时达到最佳，较小于1mm降低约41%；随着粒径增大，烧结矿强度、成品率均有所增加，冶金性能得到改善，在焦粉粒径达到2～3mm时，综合性能达到最优。

Effect of particle size of coke powder on CO emission in sintering flue gas

Aiming at the emission of atmospheric pollutants from iron and steel enterprises, the Ministry of Ecology and Environment put forward requirements for ultra low emissions such as NOx, SO2, and flue gas particulate matter. Based on this, Beijing Tianjin Hebei region also made corresponding requirements for the CO emission concentration of the sintering process. In order to explore the effect of different particle sizes of coke powder on CO emissions in sintered flue gas, the sintered cup experiment was performed, the UV differential flue gas analyzer was used to measure the CO concentration in the sintered flue gas in real time, and the performance index of the sintered ore was determined. The experimental results show that when the particle size of the coke powder is less than 1 mm, the permeability of the raw material layer is poor, the coke powder is not completely burned, and the CO emissions are large. As the particle size of the coke powder increases, intensification of granulation, the air permeability of the raw material layer and the oxidizing atmosphere are improved, and it is the best when the particle size of the coke powder reaches 3-4mm, which is about 41% lower than that of less than 1 mm; as the particle size increases, the strength and ore forming rate of the sintered ore are increased, and the metallurgical properties are improved. When the particle size of the coke powder reaches 2-3mm, the comprehensive performance is optimal.