L'air Liquide, Soci&#xe9;t&#xe9; Anonyme Pour L'etude Et L'exploitation Des Proc&#xe9;d&#xe9;s Georges Claude

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

Jacky Laurent

Remi Tsiava

Bruno Allemand

Fabien Januard

Bertrand Leroux

Patrick Recourt

Remi Pierre Tsiava

Jean-Claude Vuillermoz

Benoit Grand

Youssef Joumani

Bernard Labegorre

Xavier Paubel

Robert Kalcevic

Ivan Sanchez-Molinero

Michael G K Grant

Paul Berhaut

Savine Bockel-Macal

Patrick Jean-Marie Recourt

Jacques Mulon

St&eacute;phane Melen

Sabastien Flichy

Fr&eacute;d&eacute;ric Viraize

S&eacute;bastien Flichy

Marc Bremont

Rémi Tsiava

Niomar Marcano

Antoine Mazas

Method and burner for combusting a main fuel with a main oxidizer, whereby flows of the main fuel and the main oxidizer are injected via an injector end, comprising at least one metallic injector, said injector end being positioned in the upstream section of a main passage of a refractory block and whereby multiple jets are injected into the downstream section of the main passage to increase mixing and turbulence of the flows of the main fuel and the main oxidizer.

Method and combusting fuel and burner therefor

The invention relates to a method for heating a material in a zone heated by combustion of a fuel with an oxidant by means of a oxyburner comprising an injector arranged within a block defining a chamber with a confinement index Iconf=(S/S')&#xd7;(L/L&#x2032;)&#xd7;(1/(1+a/100))=0.10; the fuel being injected into the burner chamber with a rate IF and the oxidant being injected into the burner chamber at a rate Iox such that 0.7=IF=3.6 et 0.3=Iox=5.1, provided that when Iox&#x3e;3.8 then IF=3.3.

Combustion method and system

Process and apparatus for melting raw material in an electric arc furnace using a flame of variable direction, the apparatus comprising a burner and a lance whereby the lance outlet opening and the burner outlet opening are not concentric and are located at a distance from one another, and whereby the lance axis forms an angle with the burner axis in the range from 10&#xb0; to 40.

Combined burner and lance apparatus for electric arc furnaces

The invention relates to a method for measuring the quantity of chemical species contained in a high-temperature gas, and especially the quantity of CO and/or COcontained in a gas emitted from a metal treating furnace, especially a light-arc furnace (EAF) or a converter (BOF). According to the invention, part of the gas to be analysed is extracted, the temperature of said gas is reduced to at least 300&#xb0; C., preferably to a temperature that is lower than or equal to 200&#xb0; C., in such a way as to obtain a at a temperature between 300&#xb0; C., preferably 200&#xb0; C., and the ambient temperature, and at least the quantity of CO and/or COsaid gas is then measured by means of the coherent light signal which is emitted by a laser diode through the gas and is retrieved on emergence from the gas.

Method for measuring gaseous species by derivation

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

An electric arc furnace is provided for the production of steel by melting metal between electrodes. The electric arc furnace comprises gas injectors provided with respective cooling chambers placed in a wall of the furnace, wherein at least one single chamber is associated with at least two injectors in order to cool each injector. Each injector is angled in a manner appropriate with respect to a corresponding gas injected thereby and to a corresponding function thereof, wherein the orientation axes of the injectors are not parallel.

Electric arc furnace for the production of steel and method of operating this furnace

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Saint-Cyr l'Ecole, France

Jacky Laurent