Method and apparatus for continuously fractionating and...

G - Physics – 01 – N

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G01N 33/20 (2006.01)

Patent

CA 2422103

A method and an apparatus which continuously separate and measure mercury in an exhaust gas in accordance with each chemical conformation and display a measurement result in real time. According to the method and the apparatus, water-soluble mercury in a gas is absorbed into an absorption solution (7), the gas and the absorption solution (7) are then separated from each other, the water-soluble mercury in the absorption solution (7) is reduced to be converted into gaseous metal mercury and led to an analyzer (20), and metal mercury in the gas which is not absorbed into the absorption solution (7) is led to an analyzer (22) in the form of gas. As a result, the water-soluble mercury and the non-water-soluble mercury contained in the gas can be captured and measured/analyzed in respective measurement systems in accordance with each chemical conformation. In addition, a concentration of the metal mercury and that of the water-soluble mercury in the gas can be continuously monitored in real time. In this analysis, it is preferable to use the absorption solution (7) to absorb an acid gas which is an inhibitive component to mercury measurement, together with the water-soluble mercury.

La présente invention concerne un procédé d'analyse fractionnelle continue d'un mercure métallique et d'un mercure hydrosoluble contenus dans un gaz. Ce procédé consiste à fournir une solution absorbante (7) afin d'absorber le mercure hydrosoluble contenu dans le gaz; à séparer le gaz de la solution absorbante (7); à réduire le mercure hydrosoluble contenu dans la solution absorbante (7) de manière à le transformer en un mercure métallique dispersé dans un gaz; puis à introduire le gaz dans un analyseur (20), et, simultanément à introduire le mercure métallique qui n'a pas été absorbé par la solution absorbante (7) et qui reste sous une forme dispersée dans le gaz dans un analyseur (22). L'invention concerne également un dispositif permettant de mettre en oeuvre ce procédé. Le procédé décrit dans cette invention permet la capture, la mesure/l'analyse du mercure hydrosoluble et du mercure non hydrosoluble dans des systèmes de mesures séparés, comme différentes formes chimiques du mercure. Ce procédé permet également de suivre et d'afficher en continu et en temps réel les concentrations respectives du mercure métallique et du mercure hydrosoluble dans un gaz. De préférence, le gaz acide consistant en un composant inhibant destiné à la mesure du mercure est absorbé par la solution absorbante (7) en même temps que le mercure hydrosoluble.

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