烧结过程持久性有机污染物生成机理研究进展

Research progress of persistent organic pollutants formation mechanism in iron ore sintering process

烧结过程持久性有机污染物问题凸显,已然成为钢铁环保领域的重要研究内容。本文从二英类基本性质入手,简述了烧结工艺过程基本特征,并介绍了烧结过程二英类污染物的排放水平和分布,指出烧结过程二英类污染物的治理关键环节在于烟气。其后,重点论述了烧结过程二英类的生成机理及影响因素,指出二英类主要生成空间位于烧结床内部,从温度、碳源、氯源、氧、催化剂等方面进行深入分析和比较,为烧结过程持久性有机污染物相关研究提供理论基础。在此基础上,对目前二英类污染物源头减排技术进行梳理,提出对于烧结过程复杂工况下抑制剂的控污机理和烧结矿性能影响等相关问题仍有待深入研究,并提出烧结过程二英类生成抑制技术将成为重要研究方向。

Regarding the environmental protection in iron and steel industry,the problem of persistent organic pollutants formation in iron ore sintering process has become an important research topic. This paper introduces characteristics of PCDD/Fs,related parameters of sintering process,the emission levels and features of PCDD/Fs in sintering process. It is found that the key to control the PCDD/Fs pollutants lies in sintering flue. Then,the formation mechanism and influencing factors of PCDD/Fs are discussed,and it suggests that the pollutants of PCDD/Fs mostly generated in the sintering bed inside. Analysis and comparison of the synthesis conditions,such as temperature,carbon source,chlorine source,oxygen,catalyst,etc.,are carried out. Several important conclusions are drawn as theoretical basis for the researches on persistent organic pollutants in iron sintering process. Furthermore,current PCDD/Fs pollutants source-reduction techniques are summarized and compared. It is implied that pollutants-control mechanism of inhibitors in sintering process under complex conditions and their influences on sinter properties still need to be further studied. PCDD/Fs formation inhibition technology in the sintering process will become an important research direction.