EUROPEAN STEEL TECHNOLOGY AND APPLICATION DAYS 2017 - ESTAD 2017

Traditional approaches to blast furnace gas cleaning using wet scrubbers are being challenged by the re-emergence of dry gas cleaning technologies based on the success of the same in other parts of the iron and steel network. The wet gas cleaning of blast furnace gases offers a proven solution to the handling of the process gases removing dust and certain trace contents in the gas in a single step. But the use of wet gas cleaning involves the necessary step of cleaning the water of evolved solids and then treating these solids. Blast furnace upgrades represent an opportunity to consider the enhancement of the total existing wet systems and this paper will review how these can be implemented in a cost effective manner. Technologies to remove nitrous oxides (DeNOx) are widely spread in many high temperature processes; as stricter regulations and more stringent emissions limits need to be met the SCR (Selective Catalytic Reduction) technology will find more usage in the future. The paper gives an overview about the implementation of the SCR technology in sinter plants and about the special considerations that need to be respected.