Method for generating process steam

F - Mech Eng,Light,Heat,Weapons – 26 – B

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F26B 3/084 (2006.01) F26B 17/04 (2006.01)

Patent

CA 2743982

The invention relates to a method for generating process steam by burning dried lignite in a steam generator, comprising the drying of moist lignite in a fluidized bed dryer (1) with internal heat exchanger units (2) through which a heating medium flows, wherein at least some of the water is driven out of the lignite and removed from the dryer as vapors, dust is removed from the vapors in a dedusting device and the dried lignite is cooled in at least one cooler (6) arranged downstream of the fluidized bed dryer (1) The method according to the invention is distinguished by the fact that the brown coal dust occurring in the dedusting device is brought into direct contact with the dried and cooled lignite.

L'invention concerne un procédé pour générer une vapeur de traitement par combustion de lignite séché dans un générateur de vapeur. Ce procédé comprend les étapes consistant : à sécher du lignite humide dans un séchoir en lit fluidisé (1) comportant des composants d'échange thermique (2) traversés par une substance de chauffage, au moins une partie de l'eau étant issue du lignite et évacuée du séchoir sous la forme de vapeur chaude; à dépoussiérer cette vapeur chaude dans un dispositif de dépoussiérage (3); et à refroidir le lignite séché dans au moins un appareil de réfrigération (6) monté en aval du séchoir en lit fluidisé (1). Le procédé selon l'invention est caractérisé en ce que la poussière de lignite apparaissant dans le dispositif de dépoussiérage est mise en contact direct avec le lignite séché et refroidi.

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