烟气中多种污染物协同脱除的研究

Study on the collaborative removal of multi-pollutants from flue gas

烟气中多种污染物协同脱除是烟气净化领域的研究热点。在现有烟气脱硫技术研究的基础上,对活性焦干法、多级增湿半干法、氧化性添加剂湿法以及等离子体湿法这4种烟气污染物协同脱除技术进行了系统的研究。研究发现,以活性焦为载体添加适当的催化剂能够实现在高效脱硫基础上的同时脱硝;多级增湿半干法技术提高了脱硫剂颗粒在吸收塔内反应全过程的含湿均匀性,通过添加复合促进剂可以提高反应速率,强化烟气中SO2、NOX等污染物协同脱除;在传统的湿法烟气脱硫技术中,向脱硫剂中加入KMnO4和NaClO2等强氧化剂或者采用等离子体前置氧化,能够有效的将难吸收的NO氧化成NO2、HNO2和HNO3,最终实现同时脱硫脱硝。

The technology of multi-pollutants removal from flue gas is currently becoming the focus in the field of flue gas purification. In this paper, a systematic study using activated coke （AC） dry method, multi-step humidifi- cation semi-dry method, the wet method of oxidation additives and plasma to collaboratively remove SO2, NOx and other pollutants has been carried out. The study finds that V2 Or/AC can also achieve the removal of NOx apart from efficient desulfurization. For the semi-dry method, adopting multi-step humidification technology could improve the humidity uniformity of the desulfurization in the whole reaction process, and the low-cost accelerator could increase the reaction rate and strengthen the removal of SO2, NOx and other pollutants in flue gas. Adding strong oxidants such as KMnO4, and NaClO2 to the regular wet desulfurization or using plasma pre-oxidation can effectively oxidize the hardly absorbable NO to NO2, HNO2, and HNO3, thus achieving the efficient simultaneous desulfurization and denitrification.