NOX REDUKTION I ROEKGASER.

摘要

The NOx-reduction in a combustion flue gas current can be considerably improved by effective admixture of a reducing agent, such as NH3 or a precursor of NH3, in the absence of catalysts, such as CaO or CaCO3, which promote an unwanted reaction between NH3 and O2 in which additional NOx would be formed. By using a cyclone suitable for high temperatures or the like and by injecting the reducing agent into the current in the cyclone in a region in which a strong eddy current is in force, an extremely effective re-mixing of the NOx- reducing agent and the combustion waste gases can be promoted after particles which are damaging to the reduction reaction between NH3 and NOx have been separated out from the waste gas. A cyclone separator lined with fire-resistant material can be used, as can a plurality of injectors for injecting liquid or gas into the region in which a strong eddy current is in force.