| 摘要 |
PURPOSE:To recover sensible heat of slag and increase an efficiency of a boiler plant by a method wherein the slag under its molten condition of high temperature which is discharged from a cyclone coal furnace is cooled by air and cooling air of which temperature is increased through heat exchanging operation is used as combustion air for fine powder coal. CONSTITUTION:Fine powder coal is ignited within a cyclone coal furnace 1, ashes contained in the fine powder coal are dropped onto a cooling floor 3 of slag within a slag heat exchanging chamber 17. Cooled air fed from a cooling air blower 9 cools molten metal of high temperature. The cooled slag is crushed by a crusher 4 and sent onto a discharging conveyor 6. Cooling air of high temperature is fed into a cyclone separator 8 to separate fine slags, discharges them onto the discharging conveyor 5 located at a lower part. Clean hot air is fed into a suction side of a fine powder coal combustion forced blower 10. The blower 10 may suck hot air and surrounding atmosphere, heat exchange with discharged gas of a boiler 2 by a gas air preheater 12, further increase its temperature and the air is fed into a furnace 1 and acts as combustion air for fine powder coal injected from feeding hole. |
