| 摘要 |
PURPOSE:To eliminate the need for a pulverized coal fine powder treatment equipment for waste gas as well as effectively utilize raw materials by using waste gas from a coal drier as a fluidizing gas for the coal fluidized combustion boiler having the coal drier in front thereof. CONSTITUTION:Wet coal 21 and hot gas 22 for drying are supplied to a coal drier 20, where the wet coal 21 is dried by the hot gas 22 and supplied as a fuel coal 27 to a coal fluidized combustion boiler 23. In this case, the waste gas 24 from the coal drier 20 is supplied as a fluidizing gas 25 to the boiler 23. When the amount of the waste gas is short as the fluidizing gas, the air 26 is introduced for compensation. By this, fuel coal 27 is burned in fluidized state by means of gas blown up from the lower dispersing plate 28 of the boiler, combined with a medium, and at the same time fine coal powder contained in the waste gas 24 is also burned. On the other hand, waste gas 29 from the boiler 23 is treated by primary and secondary dust collectors and discharged through a heat exchanger 32 to the open air. |
