Refinery gas

An "eternal" flare of surplus gas is part of the safety system in any refinery. Statoil's refinery flare has been reduced to a mere night-light, because the refinery now exploits its own surplus gas internally. Formerly a large portion of the gas was transported by pipeline to Gyproc and Asnæs Power Station to be used in their production. (See e.g. section on liquid fertiliser).

Gypsum

The desulphurisation plant of Asnæs Power Station, which removes sulphur dioxide (SO2) from the flue gas, produces about 100,000 tonnes of gypsum on a yearly basis. Desulphurisation is a chemical process in which sulphur dioxide (SO2) is removed while forming the by-product gypsum. The gypsum is sold to Gyproc A/S, a company that manufactures plasterboard products for the construction industry. The gypsum from the power station reduces the import of natural gypsum significantly. Being more uniform and purer than natural gypsum, power station gypsum is therefore well suited for the plasterboard production.

Gypsum stemming from the Kara/Noverens recycling stations of Kalundborg is delivered to Gyproc A/S, thereby contributing - on a smaller scale - to reducing imports of natural gypsum and the amounts of solid waste for landfilling.