Objetivo The research may yield findings bearing on the use of existing iron-ore pellets and/or sinter material in eliminating NOx from various flue gases. If this proves feasible with artificial flue gases, follow-up research is required to study the NOx reduction rate in real flue gases. For eventual industrial applications, experience needs to be acquired with a pilot installation.Every year, Hoogovens IJmuiden emits around 8000 tonnes NOx (NO and NO2) in combustion and flue gases. The flue gases from the pellet and sintering plants account for approximately 60% of emissions. It is known from the literature, however, that NOx can be reduced to nitrogen (N2) and water vapour with the aid of ammonia and a suitable catalyst (selective catalytic reduction (SCR)). The commercial catalysts used for SCR contain V2O5 (vanadium pentoxide), MoO2 (molybdenum oxide) and WO3 (tungsten trioxide) as active components. Certain quantities of these active components may be placed in a porous matrix with a large internal surface area. This produces a large active surface area. In addition to the commercial catalysts referred to above, iron oxide (Fe2O3) also appears to have a catalytic effect in the reduction of NOx to nitrogen and water using NH3. The iron oxide Fe2O3 is produced at Hoogovens IJmuiden in the form of pellets and sinter. The advantage of using pellets rather than sinter as the catalyst material is that: - pellets are likely to yield a higher conversion rate than sinter because the proportion of Fe2O3 in pellets is higher; - pellets crumble much less than sinter; - pellets are easier to transport. The advantage of using iron-oxide catalyst material in place of commercial catalysts is that, after losing its catalytic properties, iron oxide can be used in the blast furnace (no resiual products). The catalyst bed is then replaced by new pellets produced. Research into the use of pellets as a catalyst material is aimed at demonstrating the feasibility of employing them to remove NOx from flue gases. Aspects to be covered in the research are: 1. Characterisation of the NOx reduction rate as a function of: - temperature; - flue gas quality, including: oxygen content, effect of SOx on the deactivation of the catalyst; - influence of NO-NH3 stoichiometry. Experiments with pellets will be carried out with an artificial flue gas. In follow-up research, i.e. phase two, real flue gases will be studied. 2. Required pellet qualities for use as a catalyst, including: - pellet strength; - pellet wear resistance; - porosity; - average pellet composition; 3. Influence of used and deactivated catalyst pellets on the blast-furnace process. Programa(s) ECSC-WORKENV 5C - Fifth research programme (ECSC) "Technical control of nuisances and pollution at the place of work and in the environment of iron and steel works", 1985-1989 Tema(s) 1 - Measures to combat air pollution at the place of work, inside plants and in the environment Convocatoria de propuestas Data not available Régimen de financiación Data not available Coordinador HOOGOVENS IJmuiden BV Aportación de la UE Sin datos Dirección 1970 CA Ijmuiden Países Bajos Ver en el mapa Coste total Sin datos
