Cleaner coal plants by deNOx

OCI Nitrogen’s ammonia and aqueous ammonia contribute to the improved environmental performance of coal-fired power stations. Combustion of fossil fuels releases nitrogen oxides (NOx). In particular, the high-temperature combustion process at coal-fired power stations produces large-scale emissions of NOx, which pollute the environment and can cause acid rain. Coal-fired power stations therefore utilise deNOx equipment in which ammonia is supplied that reacts with the NOx to produce nitrogen and water. These are natural components of the air and do not have a negative effect on the environment.

​Nitrogen oxides (NOx)

The high temperatures cause the release of nitrogen oxides because nitrogen (N) in the air reacts with oxygen (O). That happens in a number of different proportions (for example nitrogen monoxide, nitrogen dioxide, nitrous oxide). This group of nitrogen oxides and dioxides are therefore referred to as NOx.

DeNOx equipment

The “deNox” process utilises two methods. Thermal deNOx takes place at very high temperatures. At lower temperatures, selective catalytic reduction is used (SCR). With this method, aqueous ammonia can also be used instead of ammonia (approx. 25% solution of ammonia in water).
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