Patent ID: 6138587
Filing Date: 2000-10-31
Classification: F23C,F23G,F23L

Abstract:
A process for burning refuse comprising the steps of: depositing the refuse on a grate; providing a combustion chamber with an end region above said grate; providing a substantially vertical flue gas channel connected to said end region; transporting the refuse on said grate toward a drop-out shaft; supplying air for burning the refuse on said grate and thereby generating combustion residues and flue gas; moving said flue gas in a stream parallel to the refuse towards an end region of said combustion chamber; reversing the direction of said stream in said end region of said combustion chamber and injecting said stream through an opening in said substantially vertical flue gas channel, said flue gas channel having a substantially vertical center plane dividing said flue gas channel into two halves, said flue gas channel having a rear wall and two side walls; supplying a first part of said air as primary air through said grate from below said grate for burning said refuse; blowing a second part of said air as secondary air into said combustion chamber and also blowing a third part of said air as additional secondary air streams into a region of said opening in said substantially vertical flue gas channel; each of said additional secondary air streams being blown mirror symmetrically to said center plane into said flue gas channel, each of said additional secondary air streams having an impulse vector with a horizontal component tangential to an imaginary circle inscribed at the center of a cross-section of a corresponding channel half and defining a rotational direction of the secondary air stream with respect to the center of said circle; each of said additional secondary air streams being blown through said rear wall of said flue gas channel and being oriented toward a space between respective circle centers and an associated one of said side walls, all secondary air streams blown into a channel half having the same rotational direction, air streams in one channel half having a rotational direction opposite to the rotational direction of air streams in the other channel half, said secondary air streams in said channel halves generating two vertical oppositely rotating air swirls which are mirror symmetrical to said substantially vertical center plane.