JPH05163024A - Melting of glass raw material - Google Patents

Abstract

PURPOSE:To prevent the heat-dissipation from molten glass and to melt a glass raw material in high heat efficiency by preventing the collapse of a cold top layer formed on the molten glass material even by increasing the molten glass temperature in a melting furnace. CONSTITUTION:Glass raw material 14 is successively supplied to an electric melting furnace 11 to form a cold top layer 18 on the raw material of molten glass G. Glass raw material 14 is melted while spraying cooling water to the glass raw material forming the cold top layer 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for melting a glass raw material, and more particularly to a method for melting a glass raw material which melts while forming a cold top in an electric melting furnace.

[0002]

2. Description of the Related Art Conventionally, a method has been performed in which the glass material becomes a conductor at a high temperature, and an electric current is directly applied to molten glass from an electrode in an electric melting furnace to generate a Joule heat to melt a glass raw material. There is.

In such a melting method, in order to use the heat energy as effectively as possible, a so-called cold top layer is formed by covering the base material of the molten glass with a layer of glass raw material, thereby forming a so-called cold top layer. The glass raw material is melted while preventing heat radiation.

[0004]

However, in the conventional melting method, the temperature of the molten glass is increased by increasing the amount of electricity supplied to the molten glass from the electrode in order to prevent unmelting of the glass raw material and perform sufficient melting. If it is attempted to maintain, the glass raw material supplied to the base material of the molten glass is also rapidly melted, so the layer of the cold top formed by this glass raw material collapses early and heat radiation of the molten glass occurs from there. There is a problem of doing. That is, in the conventional melting method, by increasing the amount of electricity applied to the molten glass, the melting temperature of the molten glass is rather lowered, resulting in a contradictory problem that sufficient melting cannot be achieved. ..

Therefore, an object of the present invention is to provide a glass raw material melting method capable of melting a glass raw material with high thermal efficiency by preventing the cold top layer on the ground of the molten glass from collapsing even if the temperature of the molten glass is raised. It is to be.

[0006]

The present invention has been made in view of the above problems and objects, and glass materials are sequentially supplied into an electric melting furnace to form a cold top layer on a base material of molten glass. The method for melting a glass raw material is characterized in that the glass raw material is sprayed with water and melted.

[0007]

According to the glass raw material melting method of the present invention, the glass top is cooled by supplying the glass raw material and spraying water onto the glass raw material that forms the cold top layer on the ground of the molten glass. Therefore, even if the temperature of the molten glass is increased, the melting rate of the glass raw material forming the cold top layer does not increase, preventing the collapse of the cold top layer and preventing the heat radiation of the molten glass. Melts glass raw materials with high thermal efficiency.

Further, with respect to the water used for cooling the cold top layer, if it is supplied to the glass raw material in the form of large water droplets, so-called segregation in which the glass raw material in a homogeneous state is separated into components occurs, so that it is blown in an atomized state. It is essential to attach it. By doing so, the cold top layer can be satisfactorily cooled, and there is no influence on the quality when the glass raw material is melted.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic side view showing an apparatus for carrying out the glass raw material melting method of the present invention, and FIG. 2 is a schematic plan view thereof.

Reference numeral 11 is an electric melting furnace, and 12 is an electric melting furnace 11.
An electrode, 13 immersed in the molten glass G therein, is a batch charger for supplying the prepared glass raw material 14. The batch charger 13 is a batch conveyor 15 that conveys and supplies the glass raw material 14 into the electric melting furnace 11.
A water supply pipe 16 connected to a water supply source (not shown) is provided above the batch conveyor 15. A spray port 16 'at the tip of the water supply pipe 16 is arranged to face the glass raw material 14 supplied from the batch conveyor 15 and forming a layer on the ground of the molten glass G, and water is atomized in the spray port 16'. It has a filter for it. Reference numeral 17 denotes a guide rail for moving the batch charger 13 so that the glass raw material 14 can be uniformly supplied to a predetermined area in the electric melting furnace 11. The batch charger 13 and the water supply pipe 16 are integrated by a drive source (not shown). I can move it. On the base material of the molten glass G, the glass raw material 14 forms a cold top layer 18.

Glass raw material 1 on the ground of molten glass G
4 is a molten glass G which is directly energized by the electrode 12.
Since the glass raw material 14 is gradually melted by receiving the heat of 1, the new glass raw material 14 is supplied into the electric melting furnace 11 by the batch charger 13. Glass raw material 1 by batch conveyor 15
4 is conveyed and supplied into the electric melting furnace 11, while the water supply pipe 16 provided above the batch conveyor 15
Since water is sprayed through the spray port 16 'through the water, the glass raw material 14 supplied from the batch conveyor 15 is immediately sprayed with water. The batch charger 13 and the water supply pipe 16 move integrally along the guide rails 17, so that the glass raw material 14 forming the cold top layer 18 on the base material of the molten glass G is all sprayed with water. As a result, the cold top layer 18 is cooled. Therefore, even when the amount of electricity supplied from the electrode 12 is increased to raise the melting temperature of the molten glass G, the melting rate of the glass raw material 14 forming the cold top layer 18 does not increase, and thus the cold top layer 18 Collapse can be prevented and the glass raw material can be sufficiently melted.

[0013]

As described above, according to the method for melting a glass raw material of the present invention, even if the temperature of the molten glass is raised, the cold top layer formed on the base material of the molten glass is not collapsed. The glass raw material can be melted with high thermal efficiency without causing unmelting of the glass raw material.

[Brief description of drawings]

FIG. 1 is a schematic side view showing an example of a device for carrying out the present invention.

FIG. 2 is a schematic plan view showing an example of an apparatus for carrying out the present invention.

[Explanation of symbols]

 11 Electric Melting Furnace 12 Electrode 13 Batch Charger 14 Glass Raw Material 15 Batch Conveyor 16 Water Supply Pipe 17 Guide Rail 18 Cold Top Layer G Molten Glass

Claims (1)

[Claims] 1. Melting of glass raw material, characterized in that glass raw material is sequentially supplied into an electric melting furnace, and water is sprayed and melted on the glass raw material forming a cold top layer on the ground of molten glass. Method.