The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 29, 2007
Filed:
Aug. 31, 2004
Jean-claude Vuillermoz, Versailles, FR;
Jacky Laurent, Saint-Cyr L'Ecole, FR;
Savine Bockel-macal, Villebon-sur-Yvette, FR;
Fabien Januard, Versailles, FR;
Bruno Allemand, Dunkerque, FR;
Jean-Claude Vuillermoz, Versailles, FR;
Jacky Laurent, Saint-Cyr L'Ecole, FR;
Savine Bockel-Macal, Villebon-sur-Yvette, FR;
Fabien Januard, Versailles, FR;
Bruno Allemand, Dunkerque, FR;
Abstract
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° C., preferably to a temperature that is lower than or equal to 200° C., in such a way as to obtain a at a temperature between 300° C., preferably 200° 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.