Flue gas scrubbing method and gas-liquid contactor therefor

B - Operations – Transporting – 01 – D

Patent

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Details

B01D 53/50 (2006.01) B01D 53/40 (2006.01) B01J 8/22 (2006.01) B01J 8/26 (2006.01) C01C 1/24 (2006.01)

Patent

CA 2384872

An apparatus and process for removing acidic gases from flue gases produced by processing operations of the type carried out in utility and industrial plants. The apparatus is generally a gas-liquid contactor (110, 210) whose operation uses an ammonium sulfate-containing scrubbing solution to absorb acidic gases from flue gases, and into which oxygen and ammonia are then injected to react with the absorbed sulfur dioxide to produce ammonium sulfate as a valuable byproduct. The oxygen and ammonia are not introduced together into the scrubbing solution, but instead are introduced sequentially and in a manner so that the oxidation first occurs in a relatively low pH solution as a result of the absorbed acidic gases. The ammonia is then added to the solution in a manner that inhibits or prevents intermixing of the ammonia with the majority of the solution, but is present in the solution when recycled for further absorption of acidic gases.

Cette invention concerne un dispositif et une technique permettant d'extraire des gaz acides des gaz de combustion par une opération de traitement du type de celle utilisée dans les installations industrielles notamment. L'installation est généralement constituée par un contacteur gaz-liquide (110, 210) dans lequel une solution de lavage renfermant du sulfate d'ammonium absorbe les gaz acides contenus dans les gaz de combustion, et où l'on injecte ensuite de l'oxygène et de l'ammoniac qui réagissent avec de l'anhydride sulfureux pour produire du sulfate d'ammonium, produit secondaire précieux. L'oxygène et l'ammoniac ne sont pas introduits ensemble dans la solution de lavage, mais de manière séquentielle pour que l'oxydation ait lieu en premier dans une solution à pH relativement faible par suite de l'absorption de gaz acides. On ajoute ensuite l'ammoniac de manière de telle manière qu'il ne se mélange pas pour l'essentiel avec la solution, mais qu'il soit néanmoins présent dans ladite solution lors du recyclage en vue d'une absorption supplémentaire de gaz acides.

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