JPH1017329A - Glass melting furnace - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To enable liquid glass to flow straight down. A liquid glass (37) flowing down from a liquid glass flow hole (38) of a liquid glass flow nozzle (39) by forming a spiral groove (41) in the entire surface of the liquid glass flow hole (38) or at least at the lower end thereof. In this case, a turning or twisting is forcibly applied to correct the flowing direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a glass melting furnace.

[0002]

2. Description of the Related Art Radioactive waste liquid generated in a nuclear facility or the like is turned into a vitrified waste in a waste liquid treatment facility. Further, the vitrified waste is stored in a solidified storage container made of metal and then stored in a radioactive waste storage facility. Stored in

[0003] In the above waste liquid treatment facility, a glass melting furnace is used to melt glass raw materials to form liquid glass,
The radioactive waste liquid is mixed into the liquid glass, the liquid glass is filled into a metallic vitrified container called a canister, and the glass is solidified inside the vitrified container to form a vitrified body. .

FIG. 3 shows an example of a conventional glass melting furnace in which a storage space 1 having a cylindrical shape at an upper part and a substantially inverted cone shape with a lower part gradually decreasing in inner diameter is formed inside the furnace. A melting furnace main body 2 made of a heat-resistant brick is provided, and the side and bottom of the melting furnace main body 2 are covered with a casing main body 4 via a heat insulating member 3.
Through the casing lid 6.

A glass raw material supply port 7, a waste liquid supply port 8, and a gas discharge port 9 are provided at the top of the melting furnace main body 2 so as to communicate between the outside of the melting furnace main body 2 and the internal storage space 1. .

A glass material supply port 7 has a glass material supply nozzle 10 into which a material supply nozzle 10 is inserted, and which has a short columnar shape that travels inside a material supply pipe 11 connected near the upper end of the material supply nozzle 10. The glass raw material 12 is dropped from the raw material supply nozzle 10 into the storage space 1.

[0007] A waste liquid tank is connected to the waste liquid supply port 8 through a waste liquid supply pipe (not shown), and the waste liquid 13 is supplied from the waste liquid tank to the storage space 1.

Further, a gas processing device is connected to the gas discharge port 9 via a gas discharge pipe (not shown) so that the gas 14 generated inside the storage space 1 is sent to the gas processing device. I have.

On the other hand, a pair of electrodes 15 and 16 are provided on both sides of the melting furnace main body 2 so as to pass through the side wall portion of the melting furnace main body 2 and face each other. When a predetermined value of current is conducted between the electrodes 15 and 16 via the liquid glass 17 in a state where the liquid glass 17 is stored, the liquid glass 17 is heated and kept warm by Joule heat.

Further, an electric heater (not shown) is provided inside the melting furnace main body 2, and the glass introduced into the storage space 1 in an initial operation state before the liquid glass 17 is formed in the storage space 1. The liquid glass 17 can be obtained by melting the raw material 12 by the electric heater.

Further, a liquid glass flow down nozzle 19 having a liquid glass flow down hole 18 for flowing down the liquid glass 17 stored in the melting furnace main body 2 to the outside is provided at the bottom of the melting furnace main body 2. And the liquid glass downhole 1
A heating coil 20 connected to a high-frequency power supply (not shown) is provided on the outer periphery of the heating coil 8.

The liquid glass 17 in the melting furnace body 2 is
The surface of the solidified glass piece closing the inside of the liquid glass flow-down hole 18 is melted and fluidized by the heating coil 20, so that the glass disposed at the lower part of the liquid glass flow-down nozzle 19 via a guide (not shown). It is configured to flow down to the solidified container.

The glass melting furnace shown in FIG. 3 operates as follows.

First, in a state where the liquid glass 17 is stored in the storage space 1, a current of a predetermined value is conducted between the two electrodes 15 and 16 via the liquid glass 17, and
7 while heating and keeping the waste liquid 1 in the storage space 1 from a waste liquid tank (not shown) via a waste liquid supply pipe and a waste liquid supply port 8.
3 and the waste liquid 13 is mixed into the liquid glass 17.

On the other hand, the gas generated inside the storage space 1 is sent to the gas processing device via the gas discharge port 9 and a gas discharge pipe (not shown), and is processed by the gas processing device.

Further, a vitrified container is disposed directly below the liquid glass flow-down hole 18 via a guide section (not shown), and the solidified glass closing the liquid glass flow-down hole 18 is heated and heated by the heating coil 20. The liquid glass flow-down hole 18 is opened by fluidization, and the liquid glass 17 stored in the storage space 1 flows into the vitrified container.

When a predetermined amount of the liquid glass 17 mixed with the waste liquid 13 is filled in the vitrified container, the heating by the heating coil 20 is stopped to cool the glass in the liquid glass down hole 18. After being fixed, the liquid glass flow down hole 18 is closed.

Thereafter, the vitrified container filled with the liquid glass 17 is moved from directly below the liquid glass flowing down nozzle 19, and the liquid glass 17 inside the vitrified container is solidified by natural cooling to obtain a vitrified material ( (Not shown)), and similarly, the next vitrified container is disposed immediately below the liquid glass downflow nozzle 19.

By repeating the above operation, if the liquid glass 17 in the storage space 1 decreases and the liquid surface of the liquid glass 17 becomes close to the upper portions of the electrodes 15 and 16, the raw material supply pipe 11 and the raw material supply The glass raw material 12 is charged into the storage space 1 via the nozzle 10 so that the amount of the liquid glass 17 stored in the storage space 1 is increased.

[0020]

However, the above conventional glass melting furnace has the following problems.

That is, as shown in FIG. 3, the liquid glass flow-down nozzle 19 attached to the melting furnace main body 2 has a liquid glass flow-down hole 18 having a uniform diameter from the upper end to the lower end. The liquid glass flow down nozzle 19 is heated by the coil 20 to start the flow down of the liquid glass flow down nozzle 19.
Since the liquid glass 17 flowing down from is viscous, if a temperature imbalance occurs in the liquid glass flowing down nozzle 19 at the start of the flowing down, the glass clogged in the liquid glass flowing down nozzle 19 starts to partially melt, Since the liquid glass 17 tends to flow down while transmitting the unmelted glass portion with viscosity, a phenomenon occurs in which the liquid glass 17 does not flow straight down but flows down one side.

Then, the liquid glass 17 flows down diagonally and is caught by the guide portion or the like, and is deposited on the guide portion or the like.

The present invention has been made in view of the above circumstances, and has as its object to provide a glass melting furnace capable of flowing liquid glass straight down.

[0024]

According to the present invention, a spiral groove is formed at least at a lower end portion inside a liquid glass flow down hole of a liquid glass flow down nozzle provided at the bottom of a melting furnace main body capable of storing liquid glass. The present invention relates to a glass melting furnace.

According to the above means, the following effects can be obtained.

The liquid glass flowing down from the liquid glass flowing down hole of the liquid glass flowing down nozzle is forcibly swirled (twisted) by a spiral groove formed at the entire surface of the liquid glass flowing down hole of the liquid glass flowing down nozzle or at least at the lower end portion. Is given.

Therefore, even if the viscous liquid glass tries to flow down from the lower end opening of the liquid glass downflow nozzle, the succeeding liquid glass flows down one after another while turning or twisting. The direction of the shift is continuously corrected, and as a result, the liquid glass is caused to flow down straight downward as a whole while being twisted.

[0028]

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

FIGS. 1 and 2 show an embodiment of the present invention.

A melting furnace main body 22 made of a heat-resistant brick is provided in which a storage space 21 having a cylindrical shape at an upper portion and a substantially inverted conical shape whose inner diameter gradually decreases downward is provided.
The side and bottom of the melting furnace body 22 are covered with a casing body 24 via a heat insulating member 23, and the top of the melting furnace body 22 is covered with a casing lid 26 via a heat insulating member 25.

At the top of the melting furnace body 22, the melting furnace body 22
The glass material supply port 27, the waste liquid supply port 28, and the gas discharge port 2 are connected so that the outside and the inside of the storage space 21 communicate with each other.
9 is provided.

A glass material supply port 27 is provided with a glass material supply nozzle 30 in which a material supply nozzle 30 is inserted and arranged. The material supply nozzle 30 has a short columnar shape that travels inside a material supply pipe 31 connected near the upper end of the material supply nozzle 30. Is dropped from the raw material supply nozzle 30 into the storage space 21.

A waste liquid tank is connected to the waste liquid supply port 28 via a waste liquid supply pipe (not shown), and the waste liquid 33 is supplied from the waste liquid tank to the storage space 21.

Further, a gas processing device is connected to the gas discharge port 29 via a gas discharge pipe (not shown) so that gas 34 generated inside the storage space 21 is sent to the gas processing device. I have.

On the other hand, a pair of electrodes 35 and 36 are provided on both sides of the melting furnace main body 22 so as to face through and penetrate the side wall of the melting furnace main body 22. In a state where is stored, both electrodes 35,
When a current of a predetermined value is conducted through the liquid glass 37 during the period 36, the liquid glass 37 is heated and kept warm by Joule heat.

Further, an electric heater (not shown) is provided inside the melting furnace main body 22, and the storage space 2 is set in an initial operation state before the liquid glass 37 is formed in the storage space 21.
The liquid glass 37 can be obtained by melting the glass raw material 32 charged into 1 by the electric heater.

Further, a liquid glass flow down nozzle 39 having a liquid glass flow down hole 38 for flowing down the liquid glass 37 stored in the melting furnace main body 22 to the outside is provided at the bottom of the melting furnace main body 22. A heating coil 40 connected to a high-frequency power supply (not shown) is provided on the outer periphery of the liquid glass flow-down hole 38.

The liquid glass 37 in the melting furnace body 22
Is disposed below the liquid glass flow-down nozzle 39 via a guide (not shown) by melting and fluidizing the surface of the solidified glass piece closing the inside of the liquid glass flow-down hole 38 by a heating coil 40. It is configured to flow down to the vitrified container.

In the present invention, the spiral groove 41 is formed on the entire surface of the liquid glass flow-down nozzle 38 of the liquid glass flow-down nozzle 39 or at least on the lower end portion.

Next, the operation will be described.

First, in a state where the liquid glass 37 is stored in the storage space 21, a current of a predetermined value is conducted between the electrodes 35 and 36 via the liquid glass 37 to heat and maintain the liquid glass 37, The waste liquid 33 is supplied from a waste liquid tank (not shown) to the storage space 21 via the waste liquid supply pipe and the waste liquid supply port 28, and the waste liquid 33 is mixed into the liquid glass 37.

On the other hand, the gas generated inside the storage space 21 is sent to the gas processing device via the gas discharge port 29 and a gas discharge pipe (not shown), and is processed by the gas processing device.

Further, a vitrified container is disposed directly below the liquid glass flow-down hole 38 via a guide (not shown), and the heating coil 40 heats and solidifies the solidified glass closing the inside of the liquid glass flow-down hole 38. The liquid glass flow-down hole 38 is opened by fluidization, and the liquid glass 37 stored in the storage space 21 flows into the vitrified container.

When a predetermined amount of the liquid glass 37 mixed with the waste liquid 33 is filled in the vitrified container, the heating by the heating coil 40 is stopped to cool the glass in the liquid glass down hole 38. After being fixed, the liquid glass flow-down hole 38 is closed.

Thereafter, the vitrified container filled with the liquid glass 37 is moved from directly below the liquid glass flowing down nozzle 39, and the liquid glass 37 inside the vitrified container is solidified by natural cooling to obtain the vitrified material ( (Not shown), and the next vitrified container is similarly disposed immediately below the liquid glass downflow nozzle 39.

By repeating the above operation, if the liquid glass 37 in the storage space 21 decreases and the liquid surface of the liquid glass 37 becomes close to the upper portions of the electrodes 35 and 36, the raw material supply pipe 31 and the raw material supply Storage space 2 via nozzle 30
The glass raw material 32 is charged into the storage space 1 to increase the amount of the liquid glass 37 stored in the storage space 21.

Here, the start of the flow down of the liquid glass 37 is as follows.
The heating is performed by heating the liquid glass down-flow nozzle 39 by the heating coil 40. However, the liquid glass down-flow hole 38 having a uniform diameter from the upper end to the lower end is provided inside the liquid glass down-flow nozzle 39 attached to the melting furnace main body 22. Is formed, the liquid glass 37 flowing down from the liquid glass flowing down nozzle 39 is viscous. Therefore, when a temperature imbalance occurs in the liquid glass flowing down nozzle 39 at the start of flowing down, the liquid glass flowing down nozzle 39 Since the glass clogged in 39 starts to partially melt and tries to flow down while transmitting the unmelted glass portion with viscosity, a phenomenon occurs in which the liquid glass 37 flows down one side instead of flowing down straight down.

As a result, the liquid glass 37 flows down obliquely, is caught by the guide section, and is deposited on the guide section.

Therefore, according to the present invention, a spiral groove 41 is formed on the entire surface of the liquid glass flowing down hole 38 of the liquid glass flowing down nozzle 39 or at least at the lower end portion, and the liquid glass flowing down hole 38 of the liquid glass flowing down nozzle 39 flows down. The liquid glass 37 is forcibly turned or twisted.

Therefore, even if the viscous liquid glass 37 attempts to flow down from the lower end opening of the liquid glass downflow nozzle 39, the subsequent liquid glass 37 flows down one after another while turning or twisting. The direction of the offset is continuously corrected by the force, and as a result, the liquid glass 37 is caused to flow straight downward as a whole while being twisted.

It should be noted that the present invention is not limited to only the above-described embodiment, and it is needless to say that various changes can be made without departing from the scope of the present invention.

[0052]

As described above, according to the glass melting furnace of the present invention, an excellent effect that the liquid glass can be allowed to flow straight down directly as a whole can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic side sectional view of an embodiment of the present invention.

FIG. 2 is a partially enlarged side sectional view of FIG. 1;

FIG. 3 is a schematic side sectional view of a conventional example.

[Explanation of symbols]

 22 Melting furnace main body 37 Liquid glass 38 Liquid glass flowing down hole 39 Liquid glass flowing down nozzle 41 Spiral groove

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Kenichi Tomi 1 Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Ishikawashima-Harima Heavy Industries, Ltd. Yokohama Engineering Center (72) Inventor Rumi Kuromata Isogo, Yokohama-shi, Kanagawa 1 Shin-Nakahara-cho, Ward Ishi Kawashima-Harima Heavy Industries, Ltd. Yokohama Engineering Center

Claims (1)

[Claims] 1. A glass melting furnace characterized in that a spiral groove is formed in at least a lower end portion of a liquid glass flowing down hole of a liquid glass flowing down nozzle provided at a bottom of a melting furnace main body capable of storing liquid glass.