Abstract: An adjustable conical atomizer comprises a body part having an end or discharge face with a conical recess and a conical plug having a complementarily conically-formed surface which is adjustably positioned in the conical recess. The size of the cavity formed between the plug and the body is varied by changing the relative positions of the plug and the body, for example, by using an indexing bolt which connects the body part and the plug parts. The body or a connection to the body is provided with channels or passages for the passage of two or more fluid streams into the space between the plug and the body part for intimate mixing therein. The fluid stream includes a liquid which is accelerated in this zone between the body and the plug. The plug and the body form an annular discharge therebetween which diverges in an outward direction.

Abstract: A burner nozzle for solvent refined coal (SRC) is disclosed having means for removing heat which is adequate to maintain the exterior temperature of the burner nozzle below the level at which deposition of SRC residue has been observed. A specific embodiment comprises a water jacket about a tubular nozzle, the fuel outlet end being tapered to an edge at the fuel outlet end. The water jacket is provided with circumferential channels for circulating cooling fluid in a circuitous path around the nozzle. The channels are sized so that maximum flow velocity, and therefore maximum convective heat transfer, is maintained at the tapered edge.