| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a device for recovering valuables, which can reduce operation cost and reduce a burden of gas treatment after secondary combustion. <P>SOLUTION: The device for recovering valuables 1 includes a waste roasting furnace 11 disposed in a cement firing device 2 and a returning path for returning exhaust gas from the roasting furnace to the cement firing device. The exhaust gas from the roasting furnace can be returned via the returning path to a region of the cement firing device where the temperature is 800°C or higher. The roasting furnace can be used as a reverberatory furnace for heating wastes W in a hearth by reflecting heat generated in the cement firing device, thereby constructing an interior of the roasting furnace to face the region of 800°C or higher temperature. The roasting furnace may also be used as a fixed furnace 23 for heating the wastes with combustion gas from the cement firing device, thereby constructing an isolation site for the combustion gas from the cement firing device to be present in an area where the temperature is 500-1200°C. <P>COPYRIGHT: (C)2013,JPO&INPIT |
