SU1694486A1 - Glass-making furnace with baths - Google Patents

Abstract

The invention relates to the glass industry, can be used in the production of sheet, container, medical, electrovacuum and other glasses and allows to increase the productivity of a glass melting furnace, to reduce the specific energy consumption and reduce waste; si harmful substances into the atmosphere. A glass melting furnace bath contains an electrically heated prechamber 1 and a cooking basin 4 with flame heating and additionally a loader 8 glass breaker and a loader 6 in the end wall of the cooking basin 7. Separation of the prechamber from AA

Description

The invention relates to the glass industry and can be used in the manufacture of sheet, container, medical, vacuum and other glasses.

The purpose of the invention is to reduce specific energy consumption, increase productivity and reduce harmful emissions into the atmosphere.

FIG. 1 shows an oven; in fig. 2A-A in FIG. one.

The glass furnace bath contains a prechamber 1 with a charge loader 2 and electrodes 3, a cooking basin 4 with burners 5, a loader 6 broken glass located in the end wall 7, a loader 8 broken glass connected to a chimney 9, the separation of the prechamber and the cooking pool is performed using the element 10 with cooling holes 11. The bottom of the cooking basin is equipped with a MC 12 and a bottom transverse threshold 13 with bubbling nozzles.

The electrodes could be installed in the prechamber both vertically and horizontally, and the cooking pool could be equipped with one or more transverse rows of bubbling nozzles in the temperature maximum zone.

The furnace works as follows.

The charge is supplied by the chiller loader 2 continuously or periodically at a predetermined design rate. The cullet, the passage through the loader 8, is heated by flue exhaust gases,

The mixture is melted using electrodes 3 and the melt enters the cooking pool 4 under the barrier device. The barrier element 10 prevents the charge from entering the cooking pool and contributes to thermal stabilization of the molten glass flow from the prechamber. The preheated glass melts and mixes this melt with the melt flow from the prechamber, after which the processes of clarification and homogenization of the melt before production are carried out.

With the mock 12 in the bottom of the cooking basin, it serves to prevent contaminants from entering the process flow of glass melt. These ratios are optimal.

Example 1. The ratio of the volume of the pre-chamber and the cooking basin is less than 0.4. In this case, the processes of clarification are difficult and it is unreasonable to expend fuel, increasing the burner load in the cooking basin, where the heat transfer coefficient from the torch to the surface of the melt uncovered by the charge has low values.

Example 2. The ratio of the volume of the pre-chamber and the cooking basin is greater than 0.9. In this case, heat losses through the prechamber walls increase, since the furnace capacity is limited by the throughput capacity of the gap between the lower part of the cooled element and the bottom of the cooking basin.

Example 3. The depth of the barrier cooled device is less than 0.3 of the depth of the pre-chamber basin. In this case, relatively cold layers of glass melt from under the charge and incomplete penetration from the prechamber to the cooking pool are carried by the flow, which deteriorates the chemical homogeneity of the glass.

Example 4. Depth of the barrier device more than 0.6 of the depth of the pre-chamber basin. In this case, with increasing flow rate, the destruction of the refractor of the lower part of the barrier device and the bottom of the cooking pool at the depth of the barrier device intensifies. layers and lack of penetration, which also degrades the quality of glass.

Example 5. The depth at the bottom in the bottom of the cooking basin is less than 0 1 the depth of the inline basin. In this case, parts of the glass melt with chemical and thermal heterogeneities, as well as contaminants in the bottom layer, are not retained by the impurity and are passed to production, degrading the quality of the glass.

Example 6. The depth at mka more than 0.2 depth of the cooking basin. In this case, there is no strengthening of the cleaning effect due to the formation of a layer at a depth of more than 0.2 of the depth of the cooking basin.

Example 7. Length with less than 0.05 times the length of the cooking basin. In this case, it does not have a mopping effect on the bottom stream.

Example 8. Density with more than 0.15 hob length. In this case, when the mock does not have a cleansing effect on the bottom stream.

Example 9. The distance from the bottom surface of the element to the axis of the second (lower) through hole in it is more than 0.3 of the thickness of the barrier device. In this case, overheating and rapid wear of the refractory of the lower surface of the barrier element occur.

Example 10. The distance from the bottom surface of the cooled element to the axis of the second (bottom) through hole in it is less than 0.1 of the thickness of the barrier device. In this case, there is a rapid deterioration of the refractory of the lower part of the barrier device, due to the intense corrosion of the section of the refractory, which is under strong thermal stress (a large temperature difference with a small thickness of the refractory).

Example 11. The upper through hole in the cooled element is located below the circumference of the pool. In this case, there is an intense corrosion of the refractory of the barrier device at the level of glass melt from the side of the cooking basin.

Example 12. A glass melting furnace with a capacity of 200 tons per day, containing a stepped-mounted pre-chamber with electrodes and a window for loading the charge and a cooking basin with three pairs of burners and a chimney. The volume of the basin of the prechamber is 79.2 m3, the volume of the cooking basin is 132 m3. The ratio of the volume of the pre-chamber and the cooking basin is 0.6. The furnace contains a glass broken loader connected to the chimney and a window for loading the broken glass located in the end wall of the cooking basin. The separation of the forexamer from the cooking basin is carried out using an air-cooled 5 element immersed in the glass melt at 0.55 m, which is 0.5 of the depth of the pre-chamber basin (the depth of the pre-chamber basin is 1.1 m). The bottom of the cooking basin is made across its entire width with a depth of 0 0.15 m, which is 0.136 depth of the cooking basin (depth of the cooking basin is 1.1 m) and an extension of 1 m, which is 0.0667 of the length of the cooking basin, counting from the end wall. The submersible cooled 5 element 0.4 m thick, made of bakor, contains two through holes for air cooling — the top one at a distance of 0.08 m from the top surface of the element, and the bottom one at a distance of 0.08 m from

0 the bottom surface of the barrier device (0.2 of the element thickness).

The glass melting furnace was made in compliance with the specified parameters; according to the results of physical and mathematical modeling, it ensures stable operation when the heated glass is loaded into the end wall of the cooking pool and melted in the prechamber. It provides

The ratio of glass mass and the character of bottom and main flows are sufficient to obtain high-quality glass.

F o rmula of the invention

5 1. A glass melting furnace bath containing a prechamber, cooking basin, burners, chimney, charge loaders, a broken glass loader connected to the chimney, characterized in that, with the aim,

0 reducing specific energy consumption, increasing productivity, reducing harmful emissions into the atmosphere, the prechamber is separated from the cooking basin by a cooled element immersed in glass mass

5, to a depth equal to 0.3–0.6 of the depth of the basin of the prechamber, the bottom of the cooking basin over the entire width is made with a depth of 0.1–0.2 of the depth of the cooking basin, with a length of 0.05–0.15 of the length of the cooking 0 ° from the end wall, and the ratio of the volumes of the pre-chamber and the cooking basin is 0.4-0.9.

2. The furnace according to claim 1, characterized in that the cooled element is made with two

5 through holes - at the level of the circle and at a distance of 0.1 - 0.3 of the barrier device from its lower surface.

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Claims (2)

1. Bathroom glass melting furnace containing a pre-chamber, a cooking pool, burners. chimney, charge loaders, cullet loader connected to the chimney, characterized in that, in order to reduce specific energy consumption, increase productivity, reduce harmful emissions into the atmosphere, the prechamber is separated from the cooking pool by a cooled element immersed in glass to a depth of 0, 3 - 0.6 depths of the prechamber basin, the bottom of the cooking pool along the entire width is made with a pit depth 0.1 - 0.2 of the depth of the cooking pool, the length is 0.05 - 0.15 of the length of the cooking pool from the end wall, and the volume in the pre-chambers and the cooking pool is 0.4 - 0.9. 2. Oven pop. 1, characterized in that. that the cooled element is made with two through holes - at the ambient level and at a distance of 0.1-0.3 barrage device from its lower surface.