Method for gas lancing

• US 4,927,357 A
• Filed: 10/12/1989
• Issued: 05/22/1990
• Est. Priority Date: 04/01/1988
• Status: Expired due to Term

• Current Assignee: BOC Group Pty Limited (Linde Plc)
• Original Assignee: BOC Group Pty Limited (Linde Plc)
• Inventors: Yap, Loo T.
• Primary Examiner(s): Dority, Carroll B.
• Application Number:
  US07/420,441
• Time in Patent Office: 222 Days
• Field of Search: 432/19, 432/22, 432/196, 432/198, 431/10, 431/190
• US Class Current: 432/22
• CPC Class Codes: C03B 5/2353 by combustion with pure oxygen or oxygen-enriched air, e.g. using oxy-fuel burners or oxygen lances
• CPC Class Codes: F23C 2900/07021 Details of lances
• CPC Class Codes: F23C 5/08 Disposition of burners
• CPC Class Codes: F23C 5/14 to obtain a single flame of concentrated or substantially planar form, e.g. pencil or sheet flame F23C5/32 takes precedence
• CPC Class Codes: F23C 7/02 Disposition of air supply not passing through burner to obtain a cyclonic tapering flame when burning pulverulent fuel F23C5/32
• CPC Class Codes: F23D 2900/00013 with means for spreading the flame in a fan or fishtail shape over a melting bath
• CPC Class Codes: F23L 7/007 Supplying oxygen or oxygen-enriched air
• CPC Class Codes: F27D 7/02 Supplying steam, vapour, gases, or liquids
• CPC Class Codes: F27D 99/0033 using burners manufacture of steel in an electric arc furnace equipped with burners C21C5/5217
• CPC Class Codes: Y02E 20/34 Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
• CPC Class Codes: Y02P 40/50 Glass production, e.g. reusing waste heat during processing or shaping

Abstract

A gas-injection lance, burner, and method for use in a high temperature heating system which provides a non-axisymmetric flow of a reaction-rate enhancing gas in sufficient proximity to the flame of the system, which extends over the surface to be heated, to create an aerodynamically reduced pressure field sufficient to deform the flame and displace it in the direction of the surface to be heated. The present method provides substantially enhanced heating with the virtual elimination of hot spots.

Claims

1. In a method of heating a surface comprising providing a burner system which produces a flame extending over said surface and providing one or more reaction-rate enhancing gas lances between the burner system and the surface, said lances producing a jet of said gas between the flame and the surface, the improvement comprising emitting said reaction rate enhancing gas such that the point of exit of the gas taken perpendicular to the longitudinal axis of the flow of the gas is essentially non-circular, thereby enhancing the uniformity of heating by producing a jet which creates an aerodynamically reduced pressure field thereby deforming the flame and displacing the flame toward the surface.

2. The method of claim 1, wherein the gas lance is directed toward or away from the longitudinal axis of the flame by an angle not exceeding about 45°

.

3. The method of claim 2, wherein the gas lance is substantially parallel to the longitudinal axis of the flame.

4. The method of claim 1, wherein the reaction rate enhancing gas is oxygen.

5. The method of claim 1, further comprising emitting said flame wherein the point of exit of the flame taken perpendicular to the longitudinal axis of the flow of the flame is essentially non-circular.