Patent ID: 8127574
Filing Date: 2012-03-06
Classification: C03B,C21B,C21C,F27B,F27D,Y02P,Y02W

Abstract:
1. A method for producing mineral wool from a mineral base material in a cupola furnace, wherein the cupola furnace includes a shaft to hold the mineral base material, the lower section of said shaft provided with a grate; a combustion chamber disposed beneath said grate and provided with an outlet for removal of the mineral base material as a molten base material; at least one burner for heating the combustion chamber, the at least one burner being supplied with a fuel having a first oxygen-containing gas, the method comprising: providing the combustion chamber with at least one lance; operating the at least one burner under sub-stoichiometric conditions; conducting a second oxygen-containing gas into the combustion chamber through the at least one lance; regulating a quantity and an oxygen content of the first oxygen-containing gas according to at least one parameter of a melting process for the mineral base material, the at least one parameter selected from the group consisting of flue gas temperature, flue gas composition, temperature of the mineral base material being melted, temperature of the molten base material that has been melted, and flame intensity; wherein a central axis of the at least one lance and of a combustion chamber diameter extending through an outlet of the at least one lance produces an angle of between 10° and 30° on a horizontal plane.