Carbonization plant with waste gas recirculation

C - Chemistry – Metallurgy – 10 – B

Patent

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Details

C10B 15/02 (2006.01) C10B 21/18 (2006.01) F23C 9/00 (2006.01)

Patent

CA 2756987

Method and device to homogenize the burn-off characteristics and to reduce thermal NOx emissions from a carbonization plant designed and built according to the Non-Recovery Process or Heat Recovery Process comprised of a multitude of ovens, each oven comprised of an oven space bordered by doors and side walls for a coal charge or a compacted coal cake and comprised of a void space located above it, as well as comprised of discharge devices for waste gas from the void space, feeder devices for supply of fresh air into the void space, furthermore comprised of a system of sole channels to guide waste gas or secondary feed air, said system being integrated at least partly into the bottom floor under the oven space, wherein waste gas generated in the oven is partly returned through apertures or channels into the oven space to the combustion process of the oven.

L'invention concerne un procédé et un dispositif pour égaliser la caractéristique de carbonatation et réduire les émissions thermiques de SOx d'une installation de cokéfaction fonctionnant selon le procédé sans récupération ou le procédé à récupération de chaleur, et comprenant une pluralité de fours qui comportent chacun une chambre interne délimitée par des portes et des parois latérales, pour un lit de charbon fluide ou un pain de charbon compacté, et un espace libre situé au-dessus du charbon, des dispositifs d'évacuation pour évacuer les gaz brûlés de l'espace libre, des dispositifs d'amenée pour introduire de l'air frais dans l'espace libre, un système de carneaux de sole pour le passage des gaz brûlés ou de l'air d'amenée secondaire, intégré au moins partiellement dans la sole sous la chambre du four, les gaz brûlés générés dans le four par le processus de combustion étant partiellement renvoyés dans la chambre du four à travers des ouvertures ou des carneaux.

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