Method and device for removing sulphur dioxide from a dry...

B - Operations – Transporting – 01 – D

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B01D 53/50 (2006.01)

Patent

CA 2623104

The invention relates to a method for removing sulphur dioxide from a dry gas stream which comprises the following steps: (a) admixing a liquid comprising hydrogen peroxide into the gas stream, where sulphuric acid forms from the hydrogen peroxide and the sulphur dioxide, and (b) condensing, absorbing or aerosol-precipitating the sulphuric acid formed. The admixed liquid comprising hydrogen peroxide is mixed with the dry gas stream in less than 0.3 s so that the admixed liquid is essentially homogeneously distributed in the gas stream. In addition, the invention relates to a device for removing sulphur dioxide from a dry gas stream which comprises at least one atomizer nozzle for adding the liquid comprising hydrogen peroxide and a filter or aerosol precipitator arranged in the direction of flow of the gas stream behind the at least one atomizer nozzle, where in each case at least one atomizer nozzle is arranged on a cross sectional area of from 300 to 350 cm2.

L'invention concerne un procédé pour éliminer le dioxyde de soufre d'un flux de gaz sec, lequel procédé consiste (a) à ajouter au flux de gaz un liquide contenant du peroxyde d'hydrogène, de l'acide sulfurique se formant à partir du peroxyde d'hydrogène et du dioxyde de soufre, puis (b) à condenser l'acide sulfurique formé, à l'absorber ou à séparer les aérosols de cet acide. Le liquide ajouté, contenant du peroxyde d'hydrogène, est mélangé au flux de gaz sec en moins de 0,3 s, de sorte que le liquide ajouté est réparti de façon sensiblement homogène dans le flux de gaz. Cette invention concerne également un dispositif servant à éliminer le dioxyde de soufre d'un flux de gaz sec, lequel dispositif comporte au moins une buse de pulvérisation, servant à ajouter le liquide contenant du peroxyde d'hydrogène, et un filtre ou séparateur d'aérosol placé derrière ladite au moins une buse de pulvérisation dans le sens de passage du flux de gaz, au moins une buse de pulvérisation étant placée sur une superficie de section de 300 à 350 cm2.

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