亚铁络合物湿法脱硝液的循环再生研究进展

Research progress on regeneration of wet process denitrification solution of ferrous complex

随着大气污染问题的日益严峻,超低排放标准的日益严格,NO_x减排控制技术的研发极其关键。而湿法络合脱硝作为脱硫脱硝一体化的重要研究方向之一,特别是亚铁络合物由于对NO吸收速率快、容量大以及可实现同步脱硫等优势而被广泛研究。本文从络合剂的分类出发,以乙二胺四乙酸亚铁络合物(Fe(Ⅱ)EDTA)为例,阐述络合机理,归纳动力学特征;综述了还原剂法、生物法、光还原法还原再生络合脱硝液的研究,并就Fe(Ⅱ)EDTA络合脱硝在烧结球团领域的应用研究展开论述;最后指出光还原再生Fe(Ⅱ)EDTA具有光明的前景,如何提高其还原效率、设计高效反应器是该技术的发展方向。此外,络合脱硝产物的资源化利用也是不容忽视的问题。

With the increasingly serious problem of air pollution and increasingly stringent ultra-low emission standards,the R&D of NO_x emission reduction control technology is extremely critical.The complex denitrification of wet process,one of important research directions of the integration of desulfurization and denitrification of,especially the advantages of ferrous complex with large capacity and simultaneous desulfurization which can rapidly absorb NO,have been researched widely.The classification of complexing agents is described at first,followed by the complexation mechanism by taking Fe(Ⅱ)EDTA as an example,and then the kinetics characteristics are described.The research on reducing and regenerating complex denitrification solution by reducing agent method,biological method and photo reduction method are summarized,and the application of Fe(Ⅱ)EDTA complex denitrification in the field of sintering pellet is discussed.In the end,it is pointed out that the photo reduction regeneration of Fe(Ⅱ)EDTA has a bright future,which development direction is how to improve the reduction efficiency and how to design an efficient reactor.In addition,it is pointed that the utilization of complex denitrification products is also a problem that can’t be ignored.