Method and apparatus for monitoring mercury in a gas sample

Details Method and apparatus for monitoring mercury in a gas sample Method and apparatus for monitoring mercury in a gas sample

G - Physics

01

N

G01N 31/00 (2006.01)

Patent

CA 2606720

A converter of the Continuous Emission Monitoring System (CEMS) receives a gas sample containing vaporized mercury from a probe. The converter converts oxidized mercury present within the gas sample into an elemental mercury component and an oxidizing component using thermal cracking. The converter also reduces the pressure of the gas sample to minimize recombination of the elemental mercury component with the oxidizing components. A mercury analyzer of the system receives the reduced pressure gas sample from the converter and detects the fluorescence of the elemental mercury within the sample. The mercury analyzer holds the gas sample at the reduced pressure to reduce an effect of fluorescence quenching on the fluorescence of the elemental mercury within the sample and provides substantially accurate measurement of the concentration of the elemental mercury in the gas sample.

L'invention concerne un convertisseur d'un système de surveillance en continu d'émissions (CEMS), qui reçoit d'une sonde un échantillon de gaz contenant du mercure vaporisé. Le convertisseur transforme par craquage thermique le mercure oxydé présent dans l'échantillon en un composant du mercure élémentaire et un composant oxydant. Le convertisseur réduit aussi la pression de l'échantillon afin de réduire la recombinaison du composant de mercure élémentaire avec les composants oxydants. L'analyseur de mercure du système reçoit l'échantillon à pression réduite provenant du convertisseur et détecte la fluorescence du mercure élémentaire dans l'échantillon. L'analyseur de mercure maintient l'échantillon à la pression réduite afin de réduire l'effet d'extinction de fluorescence auquel est soumis le mercure élémentaire dans l'échantillon, et fournit une mesure sensiblement précise de la concentration du mercure élémentaire dans l'échantillon.

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