Process for the reduction of so2 from wet lime/limestone...

B - Operations – Transporting – 01 – D

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B01D 53/50 (2006.01) B01D 53/56 (2006.01) B01D 53/75 (2006.01) B01D 53/86 (2006.01) B01D 53/96 (2006.01) C01B 17/60 (2006.01) C01B 17/74 (2006.01)

Patent

CA 2311663

This invention describes a process for the scrubbing of sulfur oxides (2) from the effluent of conventional wet lime/limestone sulfur oxides reduction processes (3) in coal or oil fired plants (1). The sulfur oxides are oxidatively sorbed onto solid sorbents (4) such as magnesium aluminate spinel. Reduction with the appropriate reducing gases (such as hydrogen) regenerates the solid sorbent (5), which also yields a process stream containing sulfur oxides. The sulfur oxides containing stream (6) can be re-fed to the front end of the coal or oil fired plants (1), with the sulfur oxides thus produced ultimately being removed in the conventional wet scrubbing technology (3). This process may allow for the use of high sulfur fuels.

L'invention concerne un procédé d'élimination des oxydes de soufre (2) de l'effluent issu des procédés (3) traditionnels de réduction d'oxydes de soufre par voie humide au moyen de chaux ou de calcaire, lesquels procédés sont mis en oeuvre dans des centrales thermiques (1) alimentées au charbon ou au mazout. Des absorbants solides (4), tels qu'un spinelle d 'aluminate de magnésium, absorbent les oxydes de soufre par oxydation. Une réduction par des gaz réducteurs appropriés (tels que l'hydrogène) régénère l'absorbant solide (5), ce qui a également pour effet de produire un courant de traitement contenant des oxydes de soufre. Ce courant contenant des oxydes de soufre (6) peut-être réintroduit dans le brûleur des centrales thermiques (1) alimentées au charbon ou au mazout, et les oxydes de soufre ainsi obtenus sont finalement éliminés selon la technique traditionnelle de lavage par voie humide. Ce procédé est susceptible de permettre l'utilisation de combustibles à haute teneur en soufre.

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