Plasma gasification and vitrification of ashes

C - Chemistry – Metallurgy – 10 – J

Patent

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Details

C10J 3/57 (2006.01) C03B 5/00 (2006.01) C03B 5/02 (2006.01) C04B 5/00 (2006.01) C10J 3/18 (2006.01) F23G 5/08 (2006.01) F23G 5/10 (2006.01)

Patent

CA 2188357

This invention discloses a method and an apparatus for gasification and vitrification of ashes, such as produced in a hog-fuel fired boiler, by means of a plasma arc. The ashes are introduced into a shaft furnace where two or three tiltable electrodes are located. The plasma arc is ignited between these electrodes which are then tilted from a horizontal to an essentially vertical position whereby the arc is lengthened and then broken into separate arcs, one between each electrode and the slag accumulated at the bottom of the furnace. This plasma arc helps to burn off the organics in the ashes, producing combustion gases that can be used as a source of energy for the boiler, and to keep the slag in molten state, which allows its periodic removal through a tap hole.

L'invention décrit une méthode et un appareil de gazéification et de vitrification, au moyen d'un arc-plasma, de cendres, notamment de cendres produites dans une chaudière alimentée avec des déchets de bois utilisés comme combustible Les cendres sont introduites dans un four à cuve de fusion où se trouvent deux ou trois électrodes orientables. L'arc-plasma est allumé par ces trois électrodes qui sont ensuite ramenées d'une position horizontale à une position essentiellement verticale, de sorte que l'arc est allongé puis séparé en arcs distincts, un entre chaque électrode et le laitier accumulé au fond du four. L'arc-plasma aide à brûler toutes les matières organiques contenues dans les cendres, ce qui entraîne la production de gaz qui peuvent être utilisés comme source d'énergie pour la chaudière. De plus, l'arc-plasma aide à garder le laitier dans un état en fusion, ce qui permet de l'enlever régulièrement par le trou de coulée.

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