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L'air Liquide, Societe Anonyme a Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes Georges Claude

St&eacute;phane Melen

Panayotis Cocolios

Alain Villermet

Jacky Laurent

Jean-Claude Vuillermoz

Eckhard Prinz

Fran&ccedil;ois Coeuret

Bernd Martens

Bruno Allemand

Jean-Louis Gelot

Sabastien Flichy

Wolfgang D&ouml;ring

Jean-Yves Thonnelier

Franck F&ouml;rster

The electric arc furnace is equipped with a supersonic injector comprising a so-called Laval nozzle arranged at a certain distance above the bath. The dimensions of the nozzle are calculated as a function of the desired flow rate of oxygen and the desired velocity of the jet, and the pressure of the oxygen at the intake of the nozzle is such that the static pressure of the jet at the exit of the injector is substantially equal to the pressure of the surrounding atmosphere. Preferably, the injector comprises an annular channel for injection of natural gas, and can be used in burner mode at the start of the melting of scrap iron. The velocity of the oxygen is then subsonic.

Process for injection of a gas with the aid of a nozzle

Optimization of an installation in which an operation is performed that requires control over the atmosphere inside a chamber ( ), the operation being performed in the presence of a gaseous mixture capable of giving off emissions, the optimization being obtained by the presence of inlet ( ) and outlet ( ) devices external to the chamber to oppose the ingress of air into the chamber and the exit of gaseous emissions; and of an extraction device ( ) comprising means ( ) for regulating the flow rate to maintain an approximately zero pressure differential between the inside and the outside of the chamber.

Installation in which an operation is performed requiring over the atmosphere inside a chamber

Growing community of inventors

Paris, France

Stéphane Melen

Growing community of inventors

Paris, France

St&eacute;phane Melen

Stéphane Melen