Extraction of glass melt for production along thermally-insulated feeder channel from furnace, employs electrodes embedded in electrically-conductive refractory channel for temperature profile control

摘要

Near the drainage unit (20), the inner, glass-resistant lining (5a) is made from a melt-cast, electrically-conductive mineral material selected from AZS- and ZAC compounds (alumina zirconia silica refractories). A drainage opening (23) for glass from the furnace base, is arranged in the inner lining (5a). It has a drainage gap (21) across the flow direction. Two rod electrodes (22) are located on opposite sides of the flow channel (1) and drainage unit. Their end faces project into the inner layer towards the melt, but do not contact it. A predominant fraction of the electrical current flow is carried by the melt. An electrode plate (24) is located below the drainage opening. This ensures that the glass at the base of the furnace is more strongly heated than the production glass above it. The opposed electrodes are located above or below an inlet opening (21a) for glass at the base of the furnace. Above the drainage opening (23) in the inner layer (5a), a drainage gap is constructed. This narrows to the drainage opening, via two inclined sections (21b). The inclined sections include an angle of 15[deg]-45[deg] with the horizontal. Axes of the electrodes are aligned with a horizontal component directed towards the vertical axis A-A, which passes through the drainage opening. An independent claim IS INCLUDED FOR the corresponding glass extraction arrangement.