CZ2005651A3 - Glass melting pot furnace - Google Patents

Abstract

The glass pan melting furnace has a water chute (6) connected tightly to the bottom outlet opening (3) with a water cooling (6) covered by a plate (7) and passing through the furnace wall (2) provided with a cooled plug (14) of the lower outlet opening (3) . In the wall of the furnace (2), the waveguides (8, 9, 10, 11) are fed from the outside of the furnace (12) and directed to the point of discharge of the glass from the ladle (1).

Description

Glass melting furnace

Technical field

The present invention relates to glass melting furnaces with a direct glass discharge.

BACKGROUND OF THE INVENTION

In glass melting furnaces, the glass melted in the ladle is removed either from the surface through the upper working port or through a direct outlet, where the glass is discharged through the orifice at the bottom of the pan by means of a cooled stopper and drain groove, tube or drain. Said glass removal often results in both a reduction in the quality of the melted glass by covering the air and the formation of bubbles and contamination with foreign matter. In particular, the thermal homogeneity of the glass is compromised during melting and processing of the incandescent glass, which has an adverse effect on subsequent processing.

SUMMARY OF THE INVENTION

These drawbacks are overcome by the direct-flow glass melting furnace of the present invention. It is based on the fact that a water-cooled trough extending through the furnace wall is closely connected to the lower outlet opening of the ladle and covered by a plate in the furnace space provided with a cooled plug of the lower outlet opening. The wall of the furnace is passed by waveguides supplied from the outside of the furnace and directed to the point of discharge of glass from the ladle.

The amount of entrained glass is controlled by the amount of microwave energy absorbed in the region of the lower outlet opening of the pan and the inlet part of the trough. The glass melting furnace according to the invention makes it possible to obtain the molten glass for further processing without bubbles, without contamination by foreign substances and without temperature gradients. The quality of the discharged glass for processing thus remains at the quality level of the glass after melting and clarification in the ladle. Overview of the drawings

In the accompanying drawing, an example of the invention is shown in a schematic embodiment of FIG.

DETAILED DESCRIPTION OF THE INVENTION

The glass melting furnace has a pan 1 between the side walls 2 with a lower outlet opening 3 in the side wall 16 of the pan 1. A trough 4 is closely connected to the outlet opening 3. The glass melting furnace is further provided with a bench plate 13 covering the hearth space 5 and cooled. The water-cooling trough 4 covered by the plate 7 in the interior of the furnace extends through the side wall of the specially provided waveguides 8, 9, 10 and 11 pointing to the glass discharge point from the ladle 1. The waveguides 8, 9, 10 and 11 they are supplied from the outside of the furnace 12 by microwave power sources (not shown).

At the time of melting of the glass in the ladle 1 at a temperature of 1420 ° C to 1460 ° C, the cooled plug 14 closes the bottom outlet opening 3 of the ladle 1, preventing the glass from escaping during its melting. After melting and dropping the glass temperature to 1100 ° C to 1160 ° C, the cooled plug 14 is manually removed from the glass melting furnace and the glass begins to flow continuously through the lower outlet port 3 into the trough 4, the diameter of the lower outlet port 3 being selected so the amount of molten glass at the viscosity given by the molten glass temperature in ladle 1 corresponded to the minimum amount of glass to be processed. The discharge of the glass to the nominal amount for processing is controlled by the amount of microwave energy supplied by the waveguides 8, 9, 10 and 11 to the glass discharge point from the pan 1. Absorption of microwave energy in the side wall 16 of the pan 1 around the lower outlet opening 3 causes a local reduction in viscosity. thereby increasing its flow rate. By reducing the amount of microwave energy, the glass melt viscosity decreases up to the glass melt viscosity value in ladle 1, thereby reducing glass melt flow to a minimum value.

Industrial applicability

The glass melting furnace according to the invention can be used for all glass products for which the furnace is used.

Patent claims

Claims (1)

Glass ladle melting furnace with a ladle (1) provided with a lower outlet opening (3) in a side wall (16) of the ladle (1) _4, characterized in that to the lower outlet opening (3) a trough (4) with water cooling (6) is closely connected to the ladle (1), covered in the furnace space by a plate (7) and passing through the furnace wall (2) provided with a cooled plug (14) (2) are waveguides (8, 9, 10, 11) fed from outside the furnace (12) and directed to the glass discharge point from the ladle (1).