Grate construction of a fluidized bed boiler

F - Mech Eng,Light,Heat,Weapons – 23 – C

Patent

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Details

F23C 10/20 (2006.01) B01J 8/44 (2006.01) F22B 31/00 (2006.01) F23C 10/24 (2006.01)

Patent

CA 2300188

A grate construction of a fluidized bed boiler comprising a furnace wherein there is maintained a fluidized bed of solid particles; a windbox (14) in the lower part of the boiler under the furnace; a grate (12) having means (22) for distributing fluidizing air or like gas from the windbox into the furnace; and means (20) for removing bed material, coarse ash and like from the grate. The means for removing bed material from the grate comprise several substantially vertical pockets (20) extending from the grate into the windbox and opening into the furnace, and having, at the grate level, a horizontal cross section in the form of a longitudinal slit and having a downwards tapering vertical cross section parallel with the slits. The pockets divide the grate into sections (40 1, 40 2, 40 3, 40 4, 40 5).

L'invention concerne une construction de grille d'une chaudière à lit fluidisé comprenant un foyer dans lequel est maintenu un lit fluidisé de particules solides, une boîte à vent (14) située dans la partie inférieure de la chaudière sous le foyer; une grille (12) présentant un dispositif (22) de distribution de l'air de fluidisation ou du gaz analogue de la boîte à vent jusque dans le foyer; et un dispositif (20) destiné à extraire la matière du lit, les cendres grossières et analogue de la grille. Le dispositif d'extraction de la matière du lit de la grille comprend plusieurs poches (20) sensiblement verticales, s'étendant de la grille jusque dans la boîte à vent et débouchant dans le foyer, et présentant, au niveau de la grille, une section transversale horizontale en forme de fentes longitudinales, et présentant une section transversale verticale conique vers le bas parallèle aux fentes. Les poches divisent la grille en parties (401, 402, 403, 404, 405).

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