Emission control plays an important role in the operation of our plants. This includes all necessary measures to protect the environment from harmful effects (emissions) of air pollutants, noise, vibration, heat, light or electromagnetic fields. In the following, you will learn more about our activities to minimise the emissions from our plants.
State-of-the-art technology for the environment
The denitrification plant operates in the so-called selective catalytic reduction process: Here ammonia is injected into the hot flue gas and the mixture is passed over catalysts in which a chemical reaction takes place, converting over 70% of the nitrogen oxides (NOX) into harmless nitrogen (N₂) and water (H₂O).
Dedusting removes the fly ash from the flue gas. This process takes place in large electrostatic precipitators. There, spray electrodes build up a strong electrical field in which the ash particles are negatively charged. These are then deposited on the positively charged separating plates and are removed by rapping devices. More than 99.9 % of the fly ash can thus be removed from the flue gas.
In the desulphurisation process, the exhaust gas contaminated with sulphur dioxide (SO₂) flows upwards in a scrubber and is sprayed with a suspension of limestone and water. This binds the SO₂ and is collected in the absorber sump. With the air blown in there, the calcium sulphite - the reaction product of sulphur dioxide, limestone and water - oxidises to calcium sulphate (gypsum). The degree of separation for the sulphur dioxide is more than 90 % in the wet scrubbing process.