| 摘要 |
PURPOSE:To increase the combustion efficiency for the unburnt matter scattered into the empty tower part of a fluidized bed boiler, by mixing combustion air with the unburnt content in good condition by providing a plurality of nozzles to inject gas such as combustion air with high velocity to the wall surface of a boiler above the surface of a fluidized bed. CONSTITUTION:Fluidizing air A, flowing into an air chamber 5, passing through a pipe line 13, is injected from a perforated plate 4 to burn fuel being fed from a fuel feeder 6, as well as to form a fluidized bed 2. At that time, unburnt particles are scattered out of the bed, together with combustion gas containing unburnt matter, then part of fluidizing air being fed from a pipeline 12, or sometimes gas of the aforementioned fluidized air mixed with exhaust gas which is fed from a pipeline 14, is injected into the boiler from nozzles 8. The air is injected from each nozzle 8 at high injection speed of about 30-80m/sec. The injected air at high velocity will increase the combustion efficiency for the unburnt matter by increasing the residence time of the unburnt matter in the just above part of a fluidized bed, that is the area where cooling action for combustion matter by a water cooling wall is not so much proceeded, together with promoting mixing of combustion air with unburnt content. |
