Abstract: A burner or furnace including a combustion chamber and two or more fuel injection ports. The fuel injection ports inject fuel at non-radial injection angles into the combustion chamber. Preferably, the injection ports feed fuel substantially tangentially to a cyclonic vortex in the burner or furnace during operation. Also preferably, the injection ports are angled downward 5 to 15 degrees from a plane perpendicular to an axis of the burner or furnace.
Abstract: A process and an apparatus for recovering clay and fiber from papermaking sludge. The sludge is dried, milled, and separated into distinct clay and fiber components. The fiber component of the sludge is then used as an alternative fuel source. The clay component can be used as recycle into the papermaking process, a masonry additive, or for any other suitable purpose.