| 摘要 |
<p>PCT No. PCT/CH89/00174 Sec. 371 Date Aug. 10, 1990 Sec. 102(e) Date Aug. 10, 1990 PCT Filed Sep. 25, 1989 PCT Pub. No. WO90/03856 PCT Pub. Date Apr. 19, 1990.The slag occurring in the waste burning plant (1) is conducted from the slag exit (6) of the oven, directly into a separator (7) for coarse material and iron. There is no chilling in water. After the coarse cleaning, the slag is heated again by means of hot flue gases from the waste burning oven (1) in a preheating device (8), and then, with the feeding of additional heat, melted in a melting oven (10). Flyash is mixed with the stream of slag before the preheating device (8). The harmful substances vaporizing in the preheating and melting are condensed out of the exhaust gases and recovered. Parallel with the preheating device (8) is arranged a pyrolysis oven (9) which is also heated with a partial stream of hot flue gas from the exhaust channel (3). The pyrolysis gas is used as fuel for producing additional heat in the melting oven (10). All the remaining harmful substances not vaporized enter into harmless compounds in the molten slag or are bound, insoluble by water, in the resultant fused slag.</p> |
