JPH10177092A - Flowing-down nozzle of glass melting furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to quickly stop the flowing down of molten glass through the flowing-down nozzle of a glass melting furnace. SOLUTION: The flowing-down nozzle is provided with a nozzle main body 12, which is nearly vertically attached to the bottom of the main body 43 of a glass melting furnace, which can store molten glass 11 inside, an induction heating coil 14, which can heat the nozzle main body 12, a nozzle blocking body 46 which is arranged in the main body 43 in a state where the blocking body 46 can be moved upward and downward and, when moved downward, the blocking body 46 can block the upper end of the nozzle main body 12, and a power cylinder 51 which moves the blocking body 46 in the vertical direction against the main body 43 and stops the flowing-down of the molten glass 11 from the nozzle main body 12 by lowering the blocking body 46 by means of the power cylinder 51.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flow-down nozzle of a glass melting furnace having a function of rapidly stopping the flow of molten glass.

[0002]

2. Description of the Related Art Radioactive waste liquid generated in a nuclear facility is treated as vitrified waste by a waste liquid treatment facility and then stored in a radioactive waste storage facility.

In the above-mentioned waste liquid treatment facility, radioactive waste liquid is mixed into molten glass obtained by melting raw glass in a glass melting furnace, and the molten glass mixed with the radioactive solution is poured into a vitrified container, and the molten glass is melted. Is solidified to form a vitrified body.

FIGS. 3 and 4 show an example of a glass melting furnace.

[0005] Reference numeral 1 denotes a glass melting furnace main body. Inside the glass melting furnace main body 1, a melting space whose periphery is surrounded by a heat-resistant member 2 and whose cross-sectional area gradually decreases downward from an intermediate portion in the vertical direction. 3 are formed.

The glass melting furnace main body 1 is supported by a gantry (not shown) provided on the floor 4 of the waste liquid treatment facility.

[0007] At the upper part of the glass melting furnace main body 1, downstream of a raw material supply pipe 6 for supplying a glass raw material 5 obtained by compression-molding glass fibers into a short cylindrical shape into a melting space 3 inside the glass melting furnace main body 1. An end and an upstream end of a gas discharge pipe 7 for supplying gas generated in the melting space 3 to a gas processing facility (not shown) are connected.

A downstream end of a waste liquid supply pipe 8 for supplying waste liquid (radioactive waste liquid) to the melting space 3 via the raw material supply pipe 6 is connected to an intermediate portion of the raw material supply pipe 6.

Reference numerals 9 and 9 denote a pair of main electrodes. The main electrodes 9 and 9 are arranged substantially horizontally on the side of the glass melting furnace main body 1 such that the front ends thereof are opposed to each other in the vertical middle part of the melting space 3. It is provided in.

[0010] Reference numerals 10 and 10 denote a pair of auxiliary electrodes. The auxiliary electrodes 10 and 10 are provided substantially horizontally on the side of the glass melting furnace main body 1 so that the tips thereof face each other in the lower part of the melting space 3. ing.

When a current is supplied from a power source (not shown) between the main electrodes 9 and 9 or between the auxiliary electrodes 10 and 10 via the molten glass 11 stored in the molten space 3, the molten glass 11 As a result, the molten glass 11 is kept at a high temperature by the Joule heat generated at the same time, and the glass raw material 5 supplied from the raw material supply pipe 6 to the melting space 3 is melted.

During the initial operation of the glass melting furnace, the glass raw material 5 is melted by a heater (not shown) provided in the heat-resistant member 2.

Reference numeral 12 denotes a downflow nozzle body. The downflow nozzle body 12 is stored in the melting space 3 in communication with a flow passage 13a of a nozzle upper end member 13 provided at the bottom of the glass melting furnace body 1. The molten glass 11 is provided vertically so that the molten glass 11 can flow down to the outside.

An induction heating coil 14 for heating the downstream nozzle body 12 is attached to the outer peripheral portion of the downstream nozzle body 12.

When the temperature of the downflow nozzle body 12 is not raised by the induction heating coil 14, the glass is solidified inside the downflow nozzle body 12 and the flow of the molten glass 11 from the glass melting furnace body 1 to the outside is prevented. It is supposed to be.

Further, in a state where the temperature of the falling nozzle body 12 is raised to about the same level as the molten glass 11 by the induction heating coil 14, the solidified glass in the falling nozzle body 12 is melted, and the molten glass 11 is melted. It flows down from the glass melting furnace main body 1 to the outside.

Further, a short cylindrical outer cylinder 15 is provided at the bottom of the glass melting furnace main body 1 so as to surround the downflow nozzle main body 12 in the circumferential direction.

Reference numeral 16 denotes a coupling device outer cylinder. The coupling device outer cylinder 16 includes a vertically extending cylindrical outer cylinder upper portion 17 connected to a lower end portion of the nozzle outer cylinder 15, and an upper portion of the outer cylinder upper portion. 17, an upper flange portion 18 provided at the lower edge outer edge, a cylindrical outer cylinder lower portion 19 extending downward from the outer edge of the upper flange portion 18, and a lower flange provided at the lower edge inner edge of the outer cylinder lower portion 19 A part 20.

Reference numeral 21 denotes a coupling device inner cylinder. The coupling device inner cylinder 21 includes an inner cylinder upper portion 22 formed in an open inverted cone shape and a cylindrical inner cylinder lower portion connected to a lower end portion of the inner cylinder upper portion 22. 23.

The coupling device inner cylinder 21 has an inner cylinder upper portion 22 coaxially fixed to an inner portion of the outer cylinder upper portion 17 of the coupling device outer cylinder 16 and an inner cylinder lower portion 23 formed of the coupling device outer cylinder 16. It is located inside the lower part 19.

Reference numeral 24 denotes a coupling device driving unit. The coupling device driving unit 24 includes a weight 25 and a bellows 2 shown in FIG.
6, 27, and 28.

The weight 25 is connected to the coupling device outer cylinder 16.
An annular weight main body 29 is provided inside the outer cylinder lower part 19 so as to be able to ascend and descend and surrounds the inner cylinder lower part 23 of the coupling device inner cylinder 21 in the circumferential direction. And lower flange 2
The cylinder 30 has a cylindrical body 30 protruding from the opening of the outer casing 16 to the outside of the coupling device outer cylinder 16, and a coupling flange 31 provided at an outer edge of a lower end of the cylindrical body 30.

The bellows 26, 27 and 28 have different diameters as shown in FIG. 4, and the bellows 26 surrounds the cylindrical body 30 of the weight 25 in the circumferential direction.
The bellows 27 is provided in the outer cylinder lower part 19 of the coupling device outer cylinder 16 so as to surround the bellows 26 in the circumferential direction, and further, the bellows 28 is provided so as to surround the bellows 27 in the circumferential direction.

The upper ends of these bellows 26, 27, 28 are hermetically mounted on the lower surface of the weight body 29 of the weight 25, and the lower ends of the bellows 26, 27, 28 It is airtightly mounted on the upper surface of the lower flange portion 20.

Further, the outer peripheral surface of the bellows 26, the bellows 2
7, lower surface of weight body 29, lower flange 2
In the space 32 surrounded by the upper surface of the
The downstream end of an air pipe 35 is connected to a space 34 surrounded by the outer peripheral surface of the bellows 27, the inner peripheral surface of the bellows 28, the lower surface of the weight body 29, and the upper surface of the lower flange portion 20. (See FIG. 4).

At the upstream ends of the air pipes 33 and 35,
A compressed air source (not shown) having an air compressor and a compressed air tank is connected, and both air pipes 3 are provided from the compressed air source.
When air pressure is applied to the spaces 32 and 34 via the members 3 and 35, the weight 25 rises with respect to the coupling device outer cylinder 16,
When the spaces 32 and 34 are opened to the atmosphere, the weight 25 is lowered by its own weight.

Reference numeral 36 denotes a metal vitrified container,
At the upper end of the vitrified container 36, an injection port 37 for filling the molten glass 11 into the vitrified container 36 from the coupling flange portion 31 of the weight 25 described above is provided.

Reference numeral 38 denotes a cart, and the cart 38 is mounted on the floor 4
Vitrified container 3 on rails 39 laid in
6 with the coupling device driving unit 2
The vitrified container 36 can be positioned directly below the glass melting furnace main body 1 such that the cylindrical body 30 of the weight 25 of No. 4 and the inlet 37 of the vitrified container 36 face up and down. I have.

In FIG. 3, reference numeral 40 denotes a shielding wall.
The operation wall 41 of the waste liquid treatment facility and the processing chamber 42 in which the glass melting furnace main body 1 and the like are disposed are hermetically partitioned by the shielding wall 40.

In the glass melting furnace shown in FIGS. 3 and 4, when the molten glass 11 is filled in the vitrified container 36, air pipes 33, 3 are supplied from a compressed air source (not shown).
In a state in which air pressure is applied to the spaces 32 and 34 through the space 5 and the weight 25 is pushed upward, a bogie 38 mounted with a vitrified container 36 immediately below the glass melting furnace main body 1.
Is moved so that the cylindrical body 30 of the weight 25 of the coupling device drive unit 24 and the inlet 37 of the vitrified container 36 are vertically opposed.

Next, the spaces 32, 34 are opened to the atmosphere through the air pipes 33, 35, thereby the coupling device drive unit 2 is opened.
4 is lowered, and the cylindrical body 3 of the weight 25 is lowered.
0 is connected to the vitrified container 36
In contact with the periphery of the injection port 37.

Further, when the falling nozzle body 12 is heated by the induction heating coil 14, the glass solidified inside the falling nozzle body 12 is melted and melted in the melting space 3 of the glass melting furnace body 1. The glass 11 flows down vertically from the downflow nozzle main body 12, and the molten glass 11 passes through the coupling device inner cylinder 21 and the cylindrical body 30 of the weight 25 of the coupling device driving unit 24, and flows from the inlet 37 into the inside of the vitrified container 36. Is filled.

When a predetermined amount of the molten glass 11 is filled in the vitrified container 36, the induction heating coil 14
The heating of the downflow nozzle body 12 by the above is interrupted.

When the heating of the downflow nozzle body 12 is interrupted, the glass solidifies inside the downflow nozzle body 12, thereby preventing the molten glass 11 from flowing down from the glass melting furnace body 1 to the outside.

[0035]

However, in the glass melting furnace shown in FIGS. 3 and 4, even if the heating of the downflow nozzle body 12 by the induction heating coil 14 is interrupted, the molten glass 11 from the downflow nozzle body 12 is stopped. There is a problem that the flow of water does not stop immediately.

The present invention has been made in view of the above circumstances, and has as its object to provide a downflow nozzle of a glass melting furnace capable of rapidly stopping the downflow of molten glass.

[0037]

According to a first aspect of the present invention, there is provided a flow-down nozzle for a glass melting furnace, which is substantially perpendicular to a bottom of a glass melting furnace main body capable of storing molten glass therein. A nozzle body attached to the glass nozzle, a heating means for heating the nozzle body, and a nozzle closing member arranged to be movable up and down inside the glass melting furnace body and capable of closing the upper end of the nozzle body when lowered When,
An actuator for raising and lowering the nozzle closing body with respect to the glass melting furnace main body.

[0038] In the downflow nozzle of the glass melting furnace according to the second aspect of the present invention, in addition to the configuration of the downflow nozzle of the glass melting furnace according to the first aspect, the nozzle closing body is directed downward. It is formed in a shape in which the outer diameter is reduced, the inner diameter is reduced toward the upper end of the downflow nozzle main body downward, and the outer peripheral surface of the nozzle closing body is formed to be in close contact with the inner peripheral surface of the upper end of the downflow nozzle main body. I have.

In any of the down-flow nozzles of the glass melting furnace according to the first or second aspect of the present invention, the nozzle closing body rises while the glass inside the down-flow nozzle body is melted by the heating means. When the actuator is actuated in the direction, the nozzle closing body is separated from the upper end of the nozzle body, and the molten glass stored in the glass melting furnace body flows out through the downflow nozzle body.

When the actuator is actuated in the direction in which the nozzle closing body descends, the nozzle closing body comes into contact with the upper end of the falling nozzle main body, and the outflow of the molten glass from the glass melting furnace main body to the outside is stopped.

[0041]

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

FIGS. 1 and 2 show an embodiment of a downflow nozzle of a glass melting furnace according to the present invention.
3 and 4 denote the same parts.

The downflow nozzle of the glass melting furnace shown in FIGS. 1 and 2 is arranged so as to be able to move up and down inside the glass melting furnace main body 43 and is provided at the bottom of the glass melting furnace main body 43 when it is lowered. The nozzle closing body 46 capable of closing the flow passage 45 of the member 44 and an elevating mechanism 47 for moving the nozzle closing body 46 up and down with respect to the glass melting furnace main body 43 are provided.

The nozzle upper end member 44 is formed such that the inner diameter of the upper end of the flow passage 45 is enlarged upward, and the downstream end of the flow passage 45 communicates with the downstream nozzle body 12.

The nozzle closing body 46 is formed in a truncated conical shape whose outer diameter decreases downward so that the outer peripheral surface can be in close contact with the inner peripheral surface at the upper end of the flow passage 45.

At the upper end of the nozzle closing body 46, the lower end of a vertical shaft 48 that penetrates the upper center of the glass melting furnace main body 43 so as to be able to move up and down is fixed.

In the upper central portion of the glass melting furnace main body 43,
A hole 49 into which the nozzle closing body 46 can be inserted is formed, and a lid 50 is fitted into the hole 49 so as to air-tightly fit the vertical shaft 48 so that the vertical shaft 48 can be moved up and down. Have been.

Then, assembling of the nozzle closing body 46 to the glass melting furnace main body 43 or the nozzle closing body 4
When replacing 6, the nozzle closing body 46 can be inserted into the glass melting furnace main body 43 or taken out of the glass melting furnace main body 43 by opening the lid 50.

Since the temperature inside the glass melting furnace body 43 reaches a maximum of about 1000 ° C., the falling nozzle body 12,
For the nozzle upper end member 44, the nozzle closing body 46, and the vertical shaft 48, nickel-based alloy steel inconel or heat-resistant ceramics having excellent heat resistance is used.

An elevating mechanism 47 is attached to the upper end of a vertical shaft 48 that penetrates the lid 50 and protrudes above the glass melting furnace main body 43 to the outside.

The elevating mechanism 47 includes a power cylinder 51 supported by a fixed structure (not shown) so that the rod 51a can move up and down, and a carriage 38 located immediately below the glass melting furnace main body 43. And a weight detector 52 provided.

The lifting mechanism 47 includes a power cylinder 51 having a rod 51a projecting downward and capable of moving up and down.
And the vitrified container 36 mounted on the carriage 38 and the molten glass 1 filled in the vitrified container 36.
1 and a command signal 53s
And a control for outputting an operation signal 54s for raising or lowering the rod 51a to the power cylinder 51 based on the command signal 53s from the commander 53 and the weight detection signal 52s from the weight detector 52. Vessel 5
4 and a commander 53 and a controller 5
4 is arranged inside the operation room 41.

The rod 51a of the power cylinder 51
Is connected to the upper end of a vertical shaft 48, and the operation of the power cylinder 51 moves the nozzle closing body 46 up and down with respect to the glass melting furnace main body 43.

The operation of the downflow nozzle of the glass melting furnace shown in FIGS. 1 and 2 will be described below.

In the downflow nozzle of the glass melting furnace of the present invention shown in FIGS. 1 and 2, when filling the molten glass 11 into the vitrified container 36, the compressed air source (not shown) supplies the air piping 33, In a state where air pressure is applied to the spaces 32 and 34 via 35, and the weight 25 is pushed upward, the carriage 38 on which the vitrified container 36 is mounted is moved directly below the glass melting furnace main body 1, and the coupling device driving unit is driven. 24 weight 25 cylindrical body 30 and vitrified container 36 inlet 37
And up and down.

Next, the space 32, 34 is opened to the atmosphere through the air pipes 33, 35, thereby the coupling device drive unit 2 is opened.
4 is lowered, and the cylindrical body 3 of the weight 25 is lowered.
0 is connected to the vitrified container 36
In contact with the periphery of the injection port 37.

The downflow nozzle body 12 is heated by the induction heating coil 14 so that the glass does not solidify inside the downflow nozzle body 12.

In this state, when the command signal 53s is output from the command device 53 to the controller 54, an operation signal 54s for raising the rod 51a is output from the controller 54 to the power cylinder 51, and the operation signal 54s is output together with the rod 51a. The shaft 48 and the nozzle closure 46 are raised.

As a result, the molten glass 11 stored in the melting space 3 of the glass melting furnace main body 1 flows vertically from the flow-down nozzle main body 12 through the flow passage 45, and the coupling device inner cylinder 21 and the coupling device driving section 24 weight 25 cylindrical body 30
Through the inlet 37 to fill the inside of the vitrified container 36.

When a predetermined amount of the molten glass 11 is filled in the vitrified container 36, the controller 54 moves the rod 51 a down to the power cylinder 51 based on the weight detection signal 52 s from the weight detector 52. Activation signal 5
4s is output, and the vertical shaft 48 and the nozzle closing body 46 move down together with the rod 51a.

As a result, the nozzle closing body 46 fits inside the flow passage 45 of the nozzle upper end member 44, and the outer peripheral surface of the nozzle closing body 46 and the inner peripheral surface of the flow passage 45 come into close contact with each other. The flow of the molten glass 11 from the downflow nozzle body 12 to the outside is interrupted immediately.

Accordingly, in the downflow nozzle of the glass melting furnace shown in FIGS. 1 and 2, the supply of the molten glass 11 from the glass melting furnace main body 43 to the vitrified container 36 can be rapidly stopped.

The down-flow nozzle of the glass melting furnace of the present invention is not limited to the above-described embodiment, and a fluid pressure cylinder may be applied to the actuator instead of the power cylinder, or may be screwed into a nut. It goes without saying that various changes can be made without departing from the scope of the present invention by using an actuator of a type in which the screw shaft is rotated by the rotating means of the motor.

[0064]

As described above, according to the downflow nozzle of the glass melting furnace of the present invention, the following various excellent effects can be obtained.

(1) In any of the down-flow nozzles of the glass melting furnace according to the first and second aspects of the present invention, when the down-flow nozzle body is heated by the heating means and the nozzle closing body is raised, The molten glass stored inside the glass melting furnace body flows down from the downflow nozzle,
When the nozzle closing body is lowered, the flow of the molten glass from the downflow nozzle is immediately interrupted, so that the supply of the molten glass from the glass melting furnace main body to the vitrified container can be rapidly stopped.

(2) In the falling nozzle of the glass melting furnace according to the second aspect of the present invention, since the outer peripheral surface of the nozzle closing body is in close contact with the inner peripheral surface of the upper end portion of the falling nozzle main body, the inside of the glass melting furnace is closed. The flow of the stored molten glass to the flow-down nozzle can be more reliably blocked.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an example of an embodiment of a downflow nozzle of a glass melting furnace according to the present invention.

FIG. 2 is a side view of a portion related to a nozzle closing body related to FIG. 1;

FIG. 3 is a sectional view of an example of a downflow nozzle of a conventional glass melting furnace.

FIG. 4 is a cross-sectional view of a coupling device portion of the glass melting furnace related to FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Molten glass 12 Downflow nozzle main body 14 Induction heating coil (heating means) 43 Glass melting furnace main body 46 Nozzle closing body 51 Power cylinder (actuator)

Claims (2)

[Claims] 1. A falling nozzle body attached substantially vertically to a bottom of a glass melting furnace body capable of storing molten glass therein, heating means capable of heating the falling nozzle body, and a glass melting furnace body. A glass comprising: a nozzle closing body that is arranged to be able to move up and down and that can close an upper end of a flow-down nozzle body when descended; and an actuator that moves the nozzle closing body up and down with respect to the glass melting furnace body. Downflow nozzle of melting furnace. 2. A nozzle closing body is formed to have a shape in which the outer diameter is reduced downward, and the inner diameter is reduced toward the lower end of the upper end of the falling nozzle body, and the nozzle is closed on the inner peripheral surface of the upper end of the falling nozzle body. 2. The downflow nozzle of a glass melting furnace according to claim 1, wherein the downflow nozzle is formed in a shape such that the outer peripheral surface of the body can be in close contact.