JPS6022697A - Device for flowing down glass - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a glass flow-down process in which high-level waste liquid from nuclear power plants, for example, is introduced into a glass melting furnace together with glass raw materials, melted, and flowed down in order to be treated by solidifying it into glass. Regarding equipment. - [Technical Background of the Invention] High-level waste liquid from nuclear power plants, for example, is melted together with glass and then sealed in a storage container and stored and disposed of. The process will be explained below. First, high-level waste liquid is introduced into a glass melting furnace together with glass raw materials and melted. This molten glass is injected through a nozzle into a storage container at high temperature for processing. This injection method includes a method using a resistance heating type nozzle and a method using a high frequency heating type nozzle.

[Problems with background technology]

In the case of the above-mentioned resistance heating method, considering heating efficiency, it is difficult to increase the thickness of the nozzle to more than a few points, which results in a short service life, and it is necessary to connect a power source to the nozzle in order to heat the nozzle. - If the glass leaks, there is a risk of a short circuit, and there is also the problem of corrosion of the connecting wires. On the other hand, in the case of high-frequency heating power type, the nozzle thickness can be increased to about 2 to 3 mm, and the life is long.However, this high-frequency liquid heating method and the above-mentioned resistance In both heating methods, a so-called stringy phenomenon occurs due to the viscosity of the glass after the glass is allowed to flow down into the storage container.As mentioned above, the glass contains a high level of waste liquid. Stringy glass must also be treated.Normally, a separate nozzle is installed to deal with this stringy phenomenon, air is sent through this nozzle to cool the glass, and then the shear cut method is used to cut the glass. Although it is being processed, it is not a big drain on the share.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a glass flowing device that can prevent glass stringing and improve the safety and soundness of the device.

[Summary of the invention]

In other words, the uninvented glass flow device is a glass melting furnace,
A downstream nozzle that is connected to the glass melting furnace and causes the molten glass in the glass melting furnace to flow down, an upper heating coil provided on the upper outer periphery of the downstream nozzle, and a lower heating coil provided on the lower outer periphery of the downstream nozzle. The configuration is equipped with the following.

That is, after the molten glass is made to flow down, the lower part of the flow down nozzle is reheated by the lower heating coil to heat and melt the stringy glass and flow it down.

Therefore, it is possible to eliminate the stringiness of the glass, eliminate the need for the conventional mechanical cutting operation using the shear cut method, etc., and simplify the structure and reduce costs.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. FIG. 1 is a diagram showing a schematic configuration of a glass flowing device according to this embodiment. Reference numeral 1 in the figure indicates a glass melting furnace.

Glass raw materials are introduced into the glass melting furnace 1 together with high-level waste liquid, and are heated and melted at about 1100°C. This glass melting furnace 1
A downstream nozzle 2 is connected to the bottom wall IA. An upper heating coil 3 is attached to the upper outer periphery of the downstream nozzle 2, while a lower heating coil 4 is attached to the lower outer periphery. These upper heating coil 3 and lower heating coil 4 are connected to a high frequency oscillator 6 via a controller 5. Further, thermocouples 7.8 are provided on the outer periphery of the downstream nozzle 2 at the positions of the upper heating coil 3 and the lower heating coil 4, respectively. In other words, the thermocouples 7 and 8 and the controller 5 are used to adjust the temperatures of the upper heating coil 3 and the lower heating coil 4 while heating the glass and causing the glass to flow down.

As shown in FIGS. 2 and 3, the upper heating coil 3 and the lower heating coil 4 have a two-stage internal structure, with a water cooling channel 9 on the upper side and an air cooling channel on the lower side. 10
It is said that Further, a plurality of air outlets 11 are formed in the air cooling channel 10 . The water cooling channel 9 and the air cooling channel 10 are each connected to a supply source (not shown).

The operation will be explained based on the above configuration. First, high-level waste liquid and glass raw materials were introduced into the glass melting furnace 1, and the
Heat to melt at °.

After melting, the upper heating coil 3 and lower heating coil 4 are heated by the high frequency oscillator 6. At that time, the upper heating coil 3
The temperature of the lower heating coil 4 is adjusted by the controller 5 and thermocouples 7, 8, and heated to a temperature at which the glass flows down. After the glass has flowed down into the storage container, heating of the downstream nozzle 2 is stopped, and at the same time, water is made to flow in the water cooling channel 9 to cool the upper heating coil 3 and the lower heating coil 4. Then, air is supplied to the air cooling channel 10 and the air outlet 11
The downstream nozzle 2 is cooled by blowing from the downstream nozzle 2. After the glass stops flowing down, the lower part of the flowing nozzle 2 is reheated by the lower heating coil 4. At this time, air cooling is continued through the air cooling channel 10. As a result of the above-mentioned reheating, the glass stringing from the flow opening at the bottom of the multi-flow lower nozzle 2 is heated and melted, and flows down into the storage container. Continue heating until the stringiness is almost gone, and stop heating after the stringiness disappears. Thereafter, the downstream nozzle 2 is cooled by the air blown out from the air outlet 11, and air cooling is stopped when the temperature becomes uniform (at the top and bottom of the downstream nozzle 2).

According to the glass flowing down device according to the present embodiment, after the glass has stopped flowing down, the lower heating coil 4 reheats the lower part of the flowing down coil 2, thereby reheating the stringy glass into the storage container. Since the glass can flow downwards, the stringiness of the glass can be almost eliminated. Furthermore, since a high frequency heating method is used, there are no connecting parts (contact points) for a power source or the like near the downstream nozzle 2, and therefore there is no fear of short circuits. By selecting the heating frequency, the downstream nozzle 2
Since the wall thickness of the nozzle can be increased to 2 to 3 times, the life of the downstream nozzle 2 is also long. Further, the upper and lower heating coils 3゜4 are internally provided with a water cooling passage 9 and an air cooling passage 10, and the air cooling passage 10 is formed with an air outlet 11, so that the upper and lower heating coils 3. The lower heating coil 3.4 itself and the downstream nozzle 2 can be cooled effectively.

In the above embodiment, the upper and lower heating coils 3#4 have a two-stage round configuration, but the present invention is not limited to this. For example, the same effect can be obtained by using a two-stage square configuration.

〔Effect of the invention〕

As described in detail above, the glass flowing down device according to the present invention includes a glass melting furnace, a flowing down nozzle connected to the glass melting furnace to flow down molten glass in the glass melting furnace, and a glass flowing down nozzle provided on the upper outer periphery of the flowing down nozzle. This configuration includes an upper heating coil and a lower heating coil provided on the lower outer periphery of the downstream nozzle.

That is, after the molten glass is made to flow down, the lower part of the flow down nozzle is reheated by the lower heating coil to heat and melt the stringy glass and flow it down.

Therefore, it is possible to eliminate the stringiness of the glass, eliminate the need for mechanical cutting operations that were conventionally performed by shear cutting methods, etc., and simplify the structure and reduce costs.

[Brief explanation of drawings]

Figures 1 to 3 are diagrams showing one embodiment of the present invention, in which Figure 1 is a schematic diagram of the glass flow down device, Figure 2 is a partially detailed diagram of Figure 1, and Figure 3 is a heating coil. FIG. 1... Glass melting furnace, 2... Downflow nozzle, 3... Upper heating coil, 4... Lower heating coil. Applicant's agent Patent attorney Takehiko Suzue Figure 1 Figure 2 Figure 3) 0-548=No3(4)〉11

Claims (2)

[Claims] (1) A glass melting furnace, a flow connected to the glass melting furnace that causes the molten glass in the glass melting furnace to flow down, a lower nozzle, an upper heating coil provided on the outer periphery of the upper part of the flow nozzle, and a lower part of the flow nozzle. A glass flowing device characterized by comprising a lower heating coil provided on the outer periphery. (2) The glass flowing device according to claim 1, wherein the upper heating coil and the lower heating coil are provided with a liquid flow path and a gas flow path inside.