Faculty of Mechanical and Power Engineering, Wrocław University of Science and Technology , Wrocław, Poland.
Flue Gas Desulfurization Department, Rafako S.A , Racibórz, Poland.
J Air Waste Manag Assoc. 2020 Jun;70(6):629-640. doi: 10.1080/10962247.2020.1742816.
This article presents the results of an industrial-scale study (on 400 MW lignite fired unit) of simultaneous NO, SO, and Hg removal in FGD absorber with oxidant injection (NaClO) into flue gas. It was confirmed that the injection of sodium chlorite upstream the FGD (Flue Gas Desulfurization) absorber oxidize NO to NO, Hg to Hg, and enhancing NO and Hg removal efficiency from exhaust gas in FGD absorber. Mercury removal efficiency grows with the rise of degree of oxidation NO to NO and was limited by the phenomenon of re-emission. For NO removal the most critical parameters is slurry pH and temperature. There was no negative effect on sulfur dioxide removal efficiency caused by oxidant injection in tested FGD absorber. Based on the data provided, NO and Hg emissions can be reduced by adjusting the FGD absorber operating parameters combined with oxidant injection.
The emissions of nitrogen oxides and mercury from coal combustion have great influence of environment and human health. The injection of sodium chlorite upstream the FGD absorber oxidize NO to NO, Hg to Hg and enhancing NOx and HgT removal efficiency from flue gas.
本文介绍了在氧化剂（次氯酸钠）注入烟道的情况下，在 FGD 吸收器中同时去除 NO、SO 和 Hg 的工业规模研究（在 400MW 褐煤燃烧机组上）的结果。结果证实，在 FGD 吸收器上游注入亚氯酸钠将 NO 氧化为 NO、Hg 氧化为 Hg，并提高了 FGD 吸收器中废气的 NO 和 Hg 去除效率。汞去除效率随着氧化 NO 为 NO 的程度的增加而增加，并受到再发射现象的限制。对于 NO 去除，最关键的参数是浆液 pH 值和温度。在测试的 FGD 吸收器中，氧化剂注入不会对二氧化硫去除效率产生负面影响。根据提供的数据，通过调整 FGD 吸收器的操作参数并结合氧化剂注入，可以减少氮氧化物和汞的排放。
煤燃烧产生的氮氧化物和汞的排放对环境和人类健康有很大影响。在 FGD 吸收器上游注入亚氯酸钠将 NO 氧化为 NO、Hg 氧化为 Hg，并提高了烟气中 NOx 和 HgT 的去除效率。
