配碳量对烧结烟气排放规律的影响

Effect of carbon addition on emission of sintering flue gas

为了更好地对烧结烟气进行协同治理,建立一体化控制技术,对不同配碳量混合料进行烧结实验。通过德国testo350烟气分析仪实时在线测得烧结烟气中CO、SO2、NOx、O2等成分数据,分析烧结过程中CO、SO2、NOx形成的机理及主要影响因素。结果表明:烧结过程中,烟气CO平均质量浓度随配碳量增加而上升;SO2的排放在烧结终点前始终存在一个排放质量浓度峰值区间,并且配碳过高造成的还原性气氛不利于脱硫;烟气中的NOx主要来自于燃料燃烧产生的燃料型NOx,应使烧结燃料引入的N最小化;建议分级治理烟气,将SO2质量浓度高的区域烟气引入点火区域实现热风烧结,并且利用自反应、自催化作用协同富集降低其污染物的质量浓度。

In order to better coordinate the sintering flue gas,an integrated control technology is established,and sintering experiments are performed on mixtures with different carbon content.The test data of CO,SO2,NOx,O2 and other components in the sintered flue gas were measured online in real time by the German testo350 flue gas analyzer,and the formation mechanism and main influencing factors of CO,SO2,NOx during the sintering process were analyzed.The results show that during the sintering process,the average mass concentration of CO rises with the increase of carbon content;SO2 emissions always have a peak range of emission mass concentration before the end of sintering;The NOx in the flue gas mainly comes from the fuel-type NOx produced by fuel combustion.The N introduced by the sintered fuel should be minimized.It is recommended that the flue gas be treated in stages,and the area with high SO2 mass concentration be introduced into the ignition area to achieve hot air sintering.Self-reaction and self-catalysis synergistically reduce the mass concentration of its pollutants.