| 摘要 |
PURPOSE:To cope with a rapid increase and decrease in boiler load by stopping or starting of the flowing of fluidized medium in respective fluidized cells properly and freely. CONSTITUTION:After heated air sent from an air blower 3 fluidizes the fluidized medium 15 in the fluidized beds of a main boiler and an ash recombustion boiler 2, the air is used up as combustion air. The air pressurized further by a booster air blower 4 transfers the pulverized coal in a bunker 7 for the pulverized coal or unburnt ashes in a multicyclone 8 to the respective boilers 1, 2. Combustion gas generated from the boilers is discharged into the open air by an induced draft fan 5 through cyclones 8, 9. At this time, the fluidized medium 15 in each fluidized cell of the boiler 1 is fluidized or stopped to fluidize to control an increase and decrease in the generated amount of steam. In order not to provide large pressure change to the air duct and the whole flue system of the fluidized bed boilers, the opening and closing of the bypass damper 18 at the bypass duct 17 of the main boiler is adjusted to absorb disturbance caused by the rapid pressure change in the fluidized bed combustion system.
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