This article presents the results of an industrial-scale study (on 400 MW_e lignite fired unit) of simultaneous NO_x, SO₂, and Hg^T removal in FGD absorber with oxidant injection (NaClO₂) into flue gas. It was confirmed that the injection of sodium chlorite upstream the FGD (Flue Gas Desulfurization) absorber oxidize NO to NO₂, Hg⁰ to Hg²⁺, and enhancing NO_x and Hg^T removal efficiency from exhaust gas in FGD absorber. Mercury removal efficiency grows with the rise of degree of oxidation NO to NO₂ and was limited by the phenomenon of re-emission. For NO_x 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_x and Hg^T emissions can be reduced by adjusting the FGD absorber operating parameters combined with oxidant injection.

Implications

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 NO₂, Hg⁰ to Hg²⁺ and enhancing NOx and HgT removal efficiency from flue gas.

中文翻译：

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通过氧化剂注入（NaClO2）同时去除烟气脱硫吸收塔烟气中的NOx，SO2和Hg-全面研究。

本文介绍了工业规模的研究的结果（400 MW _Ë褐煤烧制单元）同时NO的_X，SO ₂，和Hg ^Ť去除FGD吸收剂与氧化剂注入（的NaClO ₂）到烟道气。可以肯定的是，在烟气脱硫吸收塔的上游注入亚氯酸钠可将NO氧化为NO ₂，将Hg ⁰氧化为Hg ²⁺，并提高了烟气脱硫吸收塔中废气中NO _x和Hg ^T的去除效率。脱汞效率随NO氧化成NO ₂的程度的增加而增加，并受到再排放现象的限制。对于没有_x去除最关键的参数是浆料的pH和温度。在测试的烟气脱硫塔中，氧化剂注入对二氧化硫的去除效率没有负面影响。根据所提供的数据，NO _X和Hg ^Ť可以通过调节吸收FGD运行参数与氧化剂注入组合来减少排放。

含义

燃煤产生的氮氧化物和汞的排放对环境和人类健康具有重大影响。在烟气脱硫吸收塔的上游注入亚氯酸钠可将NO氧化为NO ₂，将Hg ⁰氧化为Hg ^2+，并提高了烟道气中NOx和HgT的去除效率。