Fuel from ash

Details Fuel from ash Fuel from ash

C - Chemistry, Metallurgy

10

L

C10L 5/00 (2006.01) C10L 5/04 (2006.01) C10L 5/34 (2006.01) F23G 5/02 (2006.01)

Patent

CA 2509352

Coal ash, which also consists of fly ash, is a very fine granular solid residue obtained as a by-product of coal combustion. The invention relates to the surprising result that a fuel can be obtained from coal ash. The process involves a pneumatic separation of the coal ash at relatively low temperatures. The coal ash is separated into at least two size fractions. The size fractions obtained by the process of this invention include at least one with lower carbon and another containing increased levels of carbon in the range of 50% by weight and a heating value in the range of 4000 to 6000 Btu/lb.

La cendre de houille, contenant notamment de la cendre légère, est un résidu solide granulaire très fin, obtenu en tant que sous-produit de la combustion du charbon. L'invention porte sur la constatation surprenante qu'il est possible de dériver un combustible de cette cendre de houille. Le procédé décrit comprend une séparation pneumatique de la cendre de houille à des températures relativement basses. La cendre de houille est séparée en au moins deux fractions granulométriques. Les fractions granulométiques issues de ce procédé comprennent au moins une fraction présentant une teneur en carbone plus faible, et une seconde fraction comprenant des concentrations de carbone accrues de l'ordre de 50 % en poids, et présentent un pouvoir calorifique se situant dans un intervalle de 4000 à 6000 Btu/lb.

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