Patent ID: 6202578
Filing Date: 2001-03-20
Classification: F23C

Abstract:
A method for processing fuel with a wide particle size distribution, in which the fuel is blown tangentially with an airflow into a swirl chamber (1) having a cylindrical jacket and containing a burning mass, thus creating a vortex, comprising:leading an outlet flow of the burning mass out from the center of the swirl chamber;arranging the vortex created by the blown fuel-air mixture and by a diameter of the outlet flow to create a selective delay for relatively coarse particles, so that the size of the relatively coarse particles is reduced through mechanical treatment caused by evaporation, pyrolysis, and collision, to become smaller than a desired limit value, before the particles escape from the swirl chamber, and;holding the temperature of the cylindrical jacket of the swirl chamber below the melting point of ash from burning of the fuel, and whereinthe flow of air is divided into at least two stages, in a first stage of which the fuel to be burned is fed to the swirl chamber with a sub-stoichiometric amount of air, and in a subsequent stage of which a secondary airflow is added as a concentric toroidal flow around the outlet flow leaving the swirl chamber.