| 摘要 |
1. A method of shutting down a fluidized bed furnace for pulverized solid fuels, a perforate tray (3) being provided as the bottom boundary of the fluidized bed (2) and being connected to an air distribution chamber (4) having an air supply duct (5), a smoke gas flue (31) being disposed downstream of the fluidized bed (2) and having a plurality of heating surfaces (30), downstream of which a recycle pipe (42) for smoke gas branches off and leads into the air supply at a place upstream of the air distribution chamber (4), valve means (50) being provided one in the path (21) of the air supply upstream of the orifice of the recycle pipe (42) and one in the path of the smoke gas downstream of the branch-off of the recycle pipe (42), characterised in that for the purpose of shutting down the fluidized bed furnace (2), with the air supply to the air distribution chamber (4) being shut off, smoke gas is fed via the recycle pipe (42) and the air distribution chamber (4) to the fluidized bed (2) until the particles in the fluidized bed have cooled sufficiently and can no longer cake. |
