Inlet assembly

An inlet assembly 10 comprises an inlet nozzle 60 delivering an effluent stream into a combustion chamber 120 of an abatement apparatus. A reagent nozzle 830 is concentric with the inlet nozzle and delivers reagent in different quantities around its perimeter. An upstream gallery (810A, Fig. 4B) may feed reagent to the perimeter of the reagent nozzle. The reagent nozzle may deliver more reagent in a first region of the effluent stream than a second region and may deliver more reagent in a first portion of the reagent nozzle than a second portion. The inlet nozzle may have an obround cross section with the reagent nozzle delivering more reagent in a circular portion of the obround than a linear portion. Reagent may be delivered to the reagent nozzle through radial apertures (880, Fig. 6) around the perimeter. Reagent may be supplied to the reagent nozzle through a porous material around the perimeter with a varying porosity to deliver reagent in different quantities around the perimeter. An abatement apparatus and a method of delivering an effluent stream to a combustion chamber are also claimed.