Method for measuring gaseous species by derivation

Details Method for measuring gaseous species by derivation Method for measuring gaseous species by derivation

G - Physics

01

N

G01N 21/39 (2006.01)

Patent

CA 2537190

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 CO¿2 ?contained 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 gas at a temperature between 300 ·C, preferably 200 ·C, and the ambient temperature, and at least the quantity of CO and/or C0¿2? in said 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.

L'invention concerne un procédé de mesure de la quantité d'espèces chimiques contenues dans un gaz à haute température et notamment de la quantité de CO et/ou de CO2 contenu dans un gaz issu d'un four de traitement de métal, en notamment un four à arc (EAF) ou un convertisseur (BOF). On prélève une partie du gaz à analyser, on abaisse sa température jusqu'à moins de 300~C, de préférence jusqu'à une température inférieure ou égale à 200~C, de manière à obtenir un gaz à température comprise entre 300~C, de préférence entre 200~C et la température ambiante, puis on mesure au moins la quantité de CO et/ou CO2 présente dans ce gaz à l'aide du signal de lumière cohérente émise par une diode laser à travers ledit gaz et récupéré à sa sortie dudit gaz.

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