Primary measures are aimed at preventing the formation of NOx by making technical improvements to the combustion process at the point of creation, by influencing the key mechanisms of formation, the oxygen supply, flame and/or combustion temperature, and the flue gas dwell time at high temperatures. A significant reduction in NOx emissions has already been achieved in this way. Investigations currently in progress are establishing how, and to what extent, additional measures aimed at improving the flow of air, for example, will be able to achieve an even further reduction in the future.
Public familiarity with nitrogen oxides has increased since discussions began regarding the banning of diesel-powered vehicles. The lignite power stations operated by RWE achieved very low nitrogen oxide emissions (NOx) quite some time ago as a result of optimum combustion.
Research & Development by RWE supports the further refinement of the state of the art with regard to reducing emissions, and by setting up operational-level trial systems, RWE is testing opportunities to further reduce NOx emissions in flue gas from its fleet of power stations. At the same time, this forward-looking approach serves to observe future limitations that may arise from the European BREF LCP process.
The opportunities to reduce NOx emissions via both primary and secondary measures are being investigated in this connection.