Patent ID: 7261047
Filing Date: 2007-08-28
Classification: F23C,F23L,F23N

Abstract:
1. A method of operating a combustion process in a non-slagging cyclone burner, after start-up thereof, comprising the steps of: feeding a fuel into a cylindrically shaped combustion chamber of the non-slagging cyclone burner; feeding an oxygen-containing combustion gas with a tangential velocity into said combustion chamber, a lower limiting gas velocity and an upper limiting gas velocity being defined for said combustion gas; keeping the velocity of the combustion gas between said limiting gas velocities; maintaining after start-up one of two stoichiometric conditions: sub-stoichiometric condition and over-stoichiometric condition, by controlling the amount of fed oxygen to the amount of fed fuel; and shifting to the other one of said two stoichiometric conditions while preventing the combustion gas from obtaining a velocity outside the range defined by the lower limiting gas velocity and the upper limiting gas velocity.