| 摘要 |
A single radiation wall (15) intervenes between the preheating region (16) and the firing chamber (19). Its arched lower edge is located above the charged material (14). Its position defines the length (Lv) of the preheating region and the length (Lf) of the firing chamber. A percentage of the total internal length (Lg), these are 15-35% and 65-85% respectively. The preheating region is designed exclusively for internal preheating of the charged material within the furnace. Gas containing at least 85 vol% of oxygen is used for oxidation. The preheating waste gas outlet (18) is connected to the atmosphere, without an intervening waste heat exchanger. The tank (5) base (5a) has electrodes in the preheating region. Bubblers (8) are located ahead of the refining threshold in the firing chamber (19). They are retained by a holding plate, the upper side of which, projects up from the tank base. The stepped base rises or falls towards the threshold. The design height of glass measured above the threshold is (h2), whereas its level measured from the tank base, directly ahead of the threshold, is (h1). The threshold level (h2) is 25-50% of the base level (h1). In the homogenization region behind the threshold, the glass level is (h3) above the local base. This is 1.2-2 times the level (h1) immediately ahead of it. The burner is located in a burner zone terminating ahead of the threshold. Between tank and upper furnace, a charging opening (13) is arranged, extending over the entire width of the tank. Threshold length in the direction of flow is 8-15% of the total internal length. An independent claim IS INCLUDED FOR the corresponding method of glass melting. |
