Reducing mercury emissions from the burning of coal

B - Operations – Transporting – 01 – D

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B01D 53/64 (2006.01)

Patent

CA 2601239

Sorbent components containing calcium, alumina, silica, and halogen are used in combination during coal combustion to produce environmental benefits. Sorbents are added to the coal ahead of combustion and/or are added into the flame or downstream of the flame, preferably at minimum temperatures to assure complete formation of the refractory structures that result in various advantages of the methods. When used together, the components ~ reduce emissions of mercury and sulfur; ~ reduce emissions of elemental and oxidized mercury; ~ increase the efficiency of the coal burning process through de- slagging of boiler tubes; ~ increase the level of Hg, As, Pb, and/or Cl in the coal ash; ~ decrease the levels of leachable heavy metals (such as Hg) in the ash, preferably to levels below the detectable limits; and ~ make a highly cementitious ash product.

Selon cette invention, des composants sorbants contenant du calcium, de l'alumine, de la silice et de l'halogène sont utilisés en combinaison lors de la combustion de charbon pour produire des effets bénéfiques pour l'environnement. Il convient d'ajouter les sorbants au charbon avant la combustion et/ou dans la flamme ou en aval de la flamme, de préférence à des températures minimales pour garantir une formation complète des structures réfractaires qui donnent lieu à divers avantages des procédés. Lorsqu'ils sont utilisés conjointement, les composants: réduisent les émissions de mercure et de soufre; réduisent les émissions de mercure élémentaire et oxydé; augmentent l'efficacité du processus de combustion de charbon en décrassant les tubes de chaudières; augmentent le niveau de Hg, As, Pb et/ou Cl dans la cendre de charbon; réduisent les niveaux de métaux lourds lixiviables (tels que Hg) dans la cendre, de préférence à des niveaux inférieurs aux limites détectables; et produisent un produit de cendres hautement cimentaire.

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