Plasma burner and method of operation

US4580031A · kind A · utility

Assignee

• Fried Krupp · DE

Inventors

• Hans J. Bebber · Mülheim, DE
• Gebhard Tomalla · Essen, DE
• Heinrich-Otto Rossner · Essen, DE

Key dates

• Filing date: Jul 31, 1984
• Grant date: Apr 1, 1986
• Expiry date: Jul 31, 2004

Classification

• Technology area (CPC H): Electricity
• CPC primary: H05H1/3478
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Plasma burner having a frontal face from which a plasma jet is to be projected, for producing a long initial firing arc, having first and second concentrically arranged electrodes extending perpendicularly to the frontal face, and a nozzle surrounding the electrodes, the first electrode being centrally arranged to constitute an auxiliary electrode and having a cylindrical main portion, an electrode tip at its front end and a conically tapered portion located between the main portion and the electrode tip and tapering toward the electrode tip, the second electrode being annular and surrounding the first electrode to constitute a nozzle electrode, and having a central channel composed, successively, in the direction toward the frontal face, of a first cylindrical section, a conically tapered section and a second cylindrical section smaller in diameter than the first cylindrical section, the central channel and the first electrode together forming an annular channel. The diameter of the first cylindrical section is 1.2 to 2.5 times the diameter of the cylindrical portion. The tapered portion and the tapered section each have a cone angle of 20.degree. to 80.degree.. The distance betwe…