Inlet assembly

An inlet assembly for a burner, said inlet assembly comprising:

• an inlet nozzle defining
• an inlet aperture coupleable with an inlet conduit providing an effluent gas stream for treatment by said burner,
• a non-circular outlet aperture,
• a nozzle bore extending along a longitudinal axis between said inlet aperture and said outlet aperture for conveying said effluent gas stream from said inlet aperture to said outlet aperture for delivery to a combustion chamber of said burner, said nozzle bore having an inlet portion extending from said inlet aperture and an outlet portion extending to said non-circular outlet aperture,
• a baffle coupling said inlet portion with said outlet portion, said baffle defining a baffle aperture positioned within said nozzle bore, said baffle aperture having a reduced cross-sectional area compared to that of said outlet portion adjacent said baffle, and
• a secondary gas stream nozzle coupleable with a secondary gas stream conduit providing a secondary gas stream, said secondary gas stream nozzle being positioned to mix said secondary gas stream with said effluent gas stream within said nozzle bore wherein said baffle aperture is configured to generate a vortex in said effluent gas stream within said outlet portion and wherein said vortex has an inner flow region proximate said baffle aperture and an outer flow region proximate said outlet portion nozzle bore and said secondary gas stream nozzle is positioned to inject said secondary gas stream to flow tangentially with a direction of flow of said vortex in said inner flow region.