| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a sludge circulating and fluidized bed furnace for reducing discharging of carbon monoxide, dioxin and the like at the time of combustion through means for preventing slow combustion and pulverization of ignited substances. SOLUTION: There is provided a partition wall for dividing a furnace bed of a fluidized bed furnace into a first cell and a second cell. There is provided means for controlling an amount of supplying primary air in such a way that a superficial linear velocity in a column of the first cell positioned at a sludge feeding port side is set to such a speed as one more than a fluidization starting speed and less than a terminal speed where the fluidization medium does not disperse and its slow combustion is performed, a superficial linear velocity in a column of the second cell is more than a terminal speed. Further, at least one of an upper end or a lower end of the partition wall is provided with a flow passage for the fluidized medium and the fluidized medium is allowed to flow from the first cell into the second cell due to a difference in density of the fluidized medium between the cells.</p> |
