Methods of operating a coal burning facility

B - Operations – Transporting – 01 – D

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B01D 45/00 (2006.01) B01D 46/00 (2006.01)

Patent

CA 2635808

Methods involve adding sorbent components, such as calcium oxide, alumina, and silica, as well as optional halogens as part of environmental control. Use of the sorbents leads to significant reductions in sulfur and mercury emissions that otherwise would result from burning coal. Use of the sorbents leads to production of waste coal ash that, while higher in mercury, is nevertheless usable as a commercial product because the mercury in the ash is non-leaching and because the coal ash has a higher cementitious nature by virtue of the increased content of the sorbent components in the ash. Thus, the methods involve adding powders having qualities that lead to the production of a cementitious coal ash while at the same time reducing emissions from a coal burning facility.

L'invention concerne des procédés consistant à ajouter des composants sorbants, tels que l'oxyde de calcium, l'alumine et la silice, ainsi que des halogènes éventuels dans le cadre de la protection de l'environnement. L'utilisation de ces sorbants conduit à d'importantes réductions des émissions de soufre et de mercure qui résulteraient de la combustion du charbon. L'utilisation desdits sorbants aboutit à la production de cendres de carbon qui, malgré une teneur supérieure en mercure, peuvent néanmoins être utilisées comme un produit commercial car le mercure présent dans les cendres est non lixiviant et car les cendres de charbon présentent une nature cimentaire supérieure en raison de la teneur accrue en composants sorbants des cendres. Ces procédés consistent ainsi à ajouter des poudres présentant des qualités aboutissant à la production de cendres de charbon cimentaires, tout en réduisant des émissions d'une installation thermique au charbon.

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