Patent ID: 8328550

Claim:
Method for utilizing alternative fuels in production of clinker or cement, comprising the step of: providing a combustion device ( 17 ) that is positioned inside a reactor ( 4 ) for one or more of preheating and precalcining of raw meal, said combustion device ( 17 ) being separate from a burner ( 12 ) of the reactor ( 4 ), said combustion device comprising a chamber positioned so as to reach into the reactor ( 4 ), said chamber having an opening on its upper end with a rim, feeding alternative fuels into the chamber by means of a screw conveyor ( 16 ) arranged at a bottom of said chamber, injecting combustion air or combustion oxygen into the chamber, at least partially combusting the alternative fuels in the combustion device ( 17 ), and further feeding alternative fuels into the chamber by means of the screw conveyor ( 16 ) thereby discharging the at least partially combusted alternative fuels over the rim of the chamber into the reactor ( 4 ).