| 摘要 |
<p>1. A melting furnace of high efficiency for the melting of aggressive mineral materials having steep viscosity curves, comprising means for feeding the mixture onto the molten mass (16) and at least one outlet for discharging the molten mass, electrodes (4) for supplying electrical energy to the molten mass, which electrodes are embedded in a vertical position into the bottom (1) of the trough and extend into the molten mass (16) to at least a point close to one half of the bath depth, and burners (5) including regenerative air heaters (12) in the walls above the molten mass, with the furnace having a substantially rectangular horizontal plan and a roof arch or crown (9) spans the space from one longitudinal wall (2) to the other longitudinal wall (2), characterized in that the outlet (13) or the outlets (13) stands or stand up, respectively, from the bottom (1) of the trough and have their upper edge (17), each reaching to a point close to the surface level of the molten mass ; that the electrodes (4) have a spacing from the walls (2 and 3) which provides for the formation of a relatively cool melt or glass layer ; the longitudinal and/or transverse walls (2 or 3) extend to be inclined in outward direction from the bottom to the top in the region above the molten mass, a step (11) protruding over the melt bath (16), and extend in vertical direction starting from said step ; and that the roof arch (9) includes at the longitudinal walls (2) a step (10) protruding over the melt bath, with the inner surface of the roof arch starting to rise at said step.</p> |
