Investigation of NOx reduction during the combustion of secondary fuels

Norcem has been using secondary fuels for quite some time at its Brevik production site in order to lower fuel costs in cement manufacture while at the same time contributing to environmental protection by generating energy from waste materials. These include refuse derived fuels, liquid hazardous wastes, solid hazardous wastes, animal meal and waste oil. Extensive investigations were carried out in the Brevik cement plant and on a laboratory scale as well as in the form of flow calculations using CFD to determine the effects of the use of these secondary fuels. The studies concentrated mainly on the effects of the secondary fuels on NOx reduction and CO emissions.