| 摘要 |
<p>The present invention relates to a method and a means for charging liquid slag to a closed smelting furnace. The means for charging liquid slag comprises a double walled tube extending through an opening in the furnace roof, said tube being connected to means for raising and lowering the tube relatively to the furnace roof. Means for gas tight sealing are provided between the furnace roof and the double walled tube. A funnel shaped part is secured to the upper end of the tube, said funnel shaped part being equipped with a closeable lid for gas tight closing of the funnel shaped part. For charging of liquid slag to the furnace the tube is lowered down into the furnace to such an extent that the lower end of the tube is under the slag level in the furnace, whereafter the lid is opened and liquid slag is charged into the furnace. When charging of liquid slag is finished, the lid is closed and the tube is raised to such an extent that the lower end of the tube is above the slag level in the furnace. For cooling the tube a cooling medium with a boiling point below the slag temperature in the furnace is provided between the double walls of the tube. The cooling media will start to evaporate when the lower end of the tube is under the slag level in the furnace. The vapor is condensed in the funnel shaped part and condensed cooling medium is returned.</p> |
