Method for removing sulphur dioxide from a gas

B - Operations – Transporting – 01 – D

Patent

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B01D 53/50 (2006.01) B01D 53/14 (2006.01)

Patent

CA 2186360

A method for removing sulphur dioxide from a gas, such as a flue gas, is disclosed. In the method, the sulphur-dioxide-containing gas is conducted upwards through at least one layer of aqueous absorbent suspension, whose absorbent is lime or limestone, the volume of the suspension layer being about 100-1000 1, calculated per m3 of sulphur-dioxide-containing gas flowing through the layer every second, the static height of the layer being at least about 20 mm, preferably about 300-600 mm, and the gas flow through the layer being such that turbulence is generated in the layer, that the pH of the absorbent suspension is adjusted to about 3.0-5.5 with the aid of a buffer, preferably adipic acid, and that, separately from the sulphur-dioxide- containing gas, an oxygen-containing gas, preferably air, is supplied to the layer of absorbent suspension, preferably to the lower part of the layer of absorbent suspension and in such an amount that the molar ratio of oxygen to sulphur dioxide supplied to the suspension layer ranges from about 1:1 to about 25:1.

L'invention concerne un procédé de suppression de dioxyde de soufre d'un gaz, tel qu'un gaz de combustion. D'après ce procédé, le gaz contenant du dioxyde de soufre est conduit vers le haut à travers au moins une couche de suspension absorbante aqueuse, dont le constituant absorbant est de la chaux ou du calcaire, le volume de la couche de suspension étant d'environ 100-1000 l calculé par m?3¿ d'écoulement à la seconde de gaz contenant du dioxyde de soufre à travers la couche, la hauteur statique de ladite couche étant au moins de 20 mm environ, de préférence 300-600 mm environ. Le gaz s'écoule à travers la couche de façon à produire une turbulence, le pH de la suspension absorbante est ajusté à 3-5,5 environ à l'aide d'un tampon, de préférence de l'acide adipique et, séparément du gaz contenant du dioxyde de soufre, la couche de suspension absorbante est alimentée en un gaz contenant de l'oxygène, de préférence de l'air, de préférence au niveau de sa partie inférieure, selon une quantité telle que le rapport molaire oxygène/dioxyde de soufre se situe dans une plage de 1:1 à 25:1 environ.

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