| 摘要 |
PURPOSE:To eliminate the need for decision of a fluidized bed or reduce the number of divided cells, to sharply simplify an operational control and a control manipulation, and to improve a load responding speed, by charging the air ratio of the fluidized bed corresponding to a load. CONSTITUTION:At a high-loading time, a feed air ratio to a fluidized bed is set to 0.5-0.8 of theoretical combustion air, meanwhile, at a low-loading time, a feed air ratio is set to a sufficiently high value, or 1.1 or more, and allotment of a combustion efficiency to the inside of the fluidized bed and an air cylinder part is casued to change corresponding to a boiler load. At a low-loading time at which a fuel feed amount reduces, the combustion efficiency of the inside of the fluidized bed increases, an amount of heat supplied to the inside of the bed is held so that it is made uniform even at a wide load range, and this prevents the reduction in the bed temperature owing to a heat transfer pipe at a low- loading time. |
