Reducing sulfur gas emissions resulting from the burning of...

C - Chemistry – Metallurgy – 10 – L

Patent

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C10L 5/00 (2006.01)

Patent

CA 2571471

A process for burning coal or other carbonaceous fuels captures sulfur and other undesirable compounds are captured and retained in non-reactive ceramic- like form after the combustion phase. The process involves addition of multiple element alkali powders and/or sorbents preferably containing oxidizing anions such as nitrates and nitrites, preferably based on calcium. In various embodiments, the remediation materials when applied in a complex powder and/or liquid containing multiple elements, result in higher sulfur capture than the materials would otherwise achieve on an individual basis. In a preferred embodiment, the sorbents contain elements that minimize or lower the melting point of the ash. This leads to lowered cohesiveness and toughness of the ash so that less ash builds up on the boiler and better heat transfer is obtained.

L'invention concerne un procédé de combustion de charbon qui consiste à ajouter, avant la combustion, des sorbants liquides et/ou en poudre, permettant de capturer le soufre et d'autres composés indésirables qui apparaissent sous une forme du type céramique non réactive après la phase de combustion. On ajoute ainsi des poudres et/ou des sorbants alcalins à éléments multiples contenant de préférence des anions d'oxydation du type nitrates et nitrites, de préférence à base de calcium. Sous différentes variantes, les matériaux de remédiation, lorsqu'ils sont appliqués dans une poudre et/ou un liquide complexe contenant des éléments multiples, donnent une meilleure capture du soufre par rapport au résultat que donneraient ces matériaux sur une base individuelle. En mode de réalisation préféré, les sorbants contiennent des éléments qui réduisent au minimum ou abaissent le point de fusion de la cendre. Il en résulte une cohésion et une résistance de la cendre, moyennant quoi celle-ci s'accumule en quantité moins élevée sur la chaudière et le transfert de chaleur est amélioré.

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