Patent ID: 7252243

Claim:
Method of uniformly injecting a fluid stream into a gas stream at elevated temperature by means of an injection nozzle comprising a nozzle head and a supply inner tube being concentrically surrounded with an outer casing tube spaced apart from the inner supply tube, which method comprises passing the fluid stream through the inner tube and the nozzle head and maintaining temperature of the fluid stream in the inner tube by providing thermal insulation in at least part of an annular space between the inner tube and the outer tube; maintaining a constant flow of the fluid inside the inner tube and nozzle head by plugging the nozzle head at outlet end and spraying the fluid stream through a number of nozzle holes provided in the nozzle head adjacent to the outlet end of the nozzle head; spraying the fluid stream through the nozzle holes in a direction being substantially at right angles to flow direction of the gas stream and adjacent to center axis of the gas stream channel; and uniformly distributing the sprayed fluid stream into the gas stream by conically narrowing the outer casing tube in region adjacent to the nozzle head.