| 摘要 |
Method for reducing the flame temperature of an oxy-fuel burner, such a burner comprising a central oxygen nozzle (15) at least one fuel nozzle (17) radially spaced from the central oxygen nozzle (15), and at least one peripheral oxygen nozzle (2) at greater radial distance from the central oxygen nozzle (15) than the fuel nozzle (17), all nozzles (15, 17, 20) being at least substantially parallel, a casing (4) surrounding the nozzles and whose forward end lies in a plane at right angles to the longitudinal axis of the burner, and whose rear portion defines an oxygen chamber, and means (8, 7) for the supply of oxygen-containing gas and fuel, respectively, to the nozzles. The peripheral oxygen nozzle (20, 120) is in the form of a Laval nozzle or, if it is an annular nozzle, is of the same cross-sectional variation as a Laval nozzle throughout its entire length. The major fraction of the volume of oxygen requisite for combustion is caused to pass at great speed through at least one oxygen nozzle disposed about the burner nozzle and thereby aspirate ambient atmosphere which is at a lower temperature than the flame, before the oxygen from the oxygen nozzle reacts in the flame. |
