In April 1999 Seghers launched a new plant which will significantly reduce the risk to the environment of emissions from waste incineration plants. The Nox-dediox plant (according to the SCR system) removes polluting nitrous oxides (Nox), dioxins and furanes (PCDD/F).The plant consists of a number of components. First the flue gases are heated with the aid of steam, a heat exchanger and duct burners. Ammonia is subsequently injected in to the flue gases which then pass through a catalytic bed where specific chemical reactions take place (reduction of NOx to nitrogen and water, and destruction of dioxins and furanes). The hot flue gases are then cooled in the heat exchanger and so pass their heat to the flue gases entering the installation.
The novelty in this installation is the combination of catalytic NOx reduction with the complete destruction of dioxins. The installation makes it possible to achieve the most demanding emission standards with ease, since dioxin emissions are only a fraction of the existing standards.
The installation is suitable for the purification of flue gases from waste incineration plants and industrial installations in the non-ferrous sector, the steel industry, petrochemical and chemical works and so on.