JPS6026050B2 - Cylindrical electrode and glass melting method using a cylindrical electrode - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a cylindrical electrode comprising a ceramic tube and a molybdenum cylinder iron-bonded to the outer periphery of the ceramic tube, and the cylindrical electrode is used as an electric boosting electrode and a bubbling nozzle. This is the glass melting method used.

In a glass melting furnace that uses fuel such as heavy oil, a method in which a portion of the heat required to melt glass is combined with heating by high-rate direct current is called electric boosting (hereinafter referred to as boosting).

In this case, the applied power is consumed in melting the glass with almost 100% efficiency, so it has been widely adopted as an economical method to increase the amount of glass drawn. In addition, bubbling is used to obtain homogeneous glass during glass melting.

This is a method in which gas is introduced into the furnace from the bottom of the glass melting furnace at an appropriate location.This gas rises in the form of bubbles inside the molten glass, and as a result, the glass near the bottom of the furnace is It acts to lift the molten glass upward. Due to the rising action of these bubbles and molten glass, the low-temperature glass near the bottom of the furnace moves to the surface, and the high-temperature glass near the surface moves to the bottom of the furnace.The resulting flow of molten glass causes the clarification of the glass. This will help the effect. As mentioned above, when installing a boosting electrode in a glass melting furnace to improve the heating effect and also using bubbling to heat molten glass, conventionally the electrode and bubbling nozzle were installed separately near the bottom of the furnace. It had been.

For example, as shown in FIG. 1, in a glass melting furnace, a boosting electrode rod 1 and a bubbling nozzle 2 are mounted on a furnace bottom 5 via a boosting furnace material 3 and a bebbling furnace material 4, respectively. . 6 is a furnace material for heat retention at the bottom of the furnace.

The boosting furnace material 3 and the bubbling furnace material 4 are usually installed so as to protrude upward from the bottom surface of the furnace by about 50 to 75 sides, but it is difficult to keep them properly warm. Therefore,
Separately installing the boosting electrode and the bubbling nozzle has the disadvantage of increasing the heat loss of the furnace. It is also desired to make the ocean loss effect of the molten glass more efficient by matching the position of the heat convection of the molten glass caused by boosting with the position of the convection caused by the bubbles of bubbling. This invention was made in order to eliminate the above-mentioned drawbacks and meet the demands.The electrode shank conventionally used for boosting is replaced with a cylindrical electrode having a permeable hole in the axis, and this cylindrical electrode By introducing bubbling gas into the furnace through the bubbling nozzle and electrode rod, which were installed separately, the bubbling nozzle and electrode rod are integrated into one body.

This reduces the heat loss of the furnace, and also synergistically increases the glass rope effect by matching the convection caused by heating in the furnace with the convection caused by bubbling bubbles.
This invention includes a cylindrical electrode consisting of a ceramic tube and a molybdenum cylindrical body saddle-fitted to enclose the outer periphery of the ceramic tube, and a cylindrical electrode having a through hole in the center of the bag, and a cylindrical electrode disposed near the bottom of a glass melting furnace. This is a glass melting method in which electrical heating and/or bubbling gas is supplied to molten glass using the provided cylindrical electrode.

The cylindrical electrode of the present invention will be described with reference to the embodiment shown in FIG. 2. A cylindrical electrode A is constructed by iron-bonding a molybdenum cylindrical body 8 so as to enclose the outer circumference of a ceramic tube 7.

Reference numeral 9 denotes a current-carrying terminal attached to the outer periphery of the cylindrical electrode A, that is, the molybdenum cylinder 8, and is connected to a power source (not shown) via an electric wire 10 so that the molybdenum cylinder 8 operates as an electrode. .

One end of the ceramic tube 7 protrudes from the end of the molybdenum cylinder 8 and is connected to a conduit 11, through which bubbling gas is supplied. Since the bubbling gas is sent into the furnace through the ceramic tube and does not come into direct contact with the molybdenum cylinder, it is not limited to inert or reducing gases, and even regular air can be used to The molybdenum cylinder does not oxidize. This cylindrical electrode is attached to the bottom of a glass melting furnace in substantially the same manner as a conventional electrode rod, as shown in FIG.

The cylindrical electrode A is mounted in the furnace bottom 5 through the furnace material 12, and bubbling gas is supplied into the furnace through the ceramic tube 7 to perform bubbling, and at the same time, the molybdenum segments 8
is used as an electrode to heat the molten glass. The energization and bubbling can be performed independently depending on the melting state of the glass. The bubbling piping in this cylindrical electrode is safe because the ceramic tube is non-conductive and there is no risk of electrical leakage. Next, in order to replenish the exhausted cylindrical electrode, as shown in FIG. By screwing the threaded convex threaded part 8a to the protruded threaded part 8b threaded on the -end of the molybdenum cylinder body 8 of another cylindrical electrode B of the same type, the ceramic tube 7, The end faces of 7 are also in close contact, and the two cylindrical electrodes A and B
can be combined.

In this way, replenishment of the cylindrical electrodes can be easily performed with extremely simple operations. It is also possible to insert the ceramic tube alone into the furnace. As described above, the present invention is a cylindrical electrode that integrates an electric boosting electrode and a bubbling nozzle in glass melting, and a glass melting method using this cylindrical electrode, which reduces heat loss in a glass melting furnace. At the same time, it has the effect of increasing the concentration effect of molten glass, and is extremely excellent in practical use.

[Brief explanation of the drawing]

Fig. 1 is a partially enlarged cross-sectional view showing an example of a glass melting furnace in which an electric boosting electrode and a boosting nozzle are installed, and Fig. 2 is a partially longitudinal cross-sectional view showing an example of the cylindrical electrode of the present invention. A plan view, FIG. 3 is a longitudinal cross-sectional view showing the cylindrical electrode installed in the glass melting furnace, and FIG. 4 is a longitudinal cross-sectional view showing the coupled state of the cylindrical electrode. 1 is a boosting electrode rod, 2 is a bubbling nozzle, 7 is a ceramic tube, and 8 is a molybdenum cylinder. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Scope of Claims] 1. A cylindrical electrode comprising a ceramic tube and a molybdenum cylinder fitted to cover the outer circumference of the ceramic tube, and having a through hole in its axis. 2. A cylindrical electrode consisting of a ceramic tube and a molybdenum cylinder fitted to cover the outer periphery of the ceramic tube and having a through hole in its axis is disposed near the bottom of the glass melting furnace. A glass melting method using a cylindrical electrode, characterized in that electrical heating and/or bubbling gas is supplied to molten glass via the cylindrical electrode.