JPH09281294A - Device for monitoring downflow of fused glass - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to exactly detect the presence or absence of the abnormality of the downflow state of fused glass by deciding the state of the fused glass flowing down from a nozzle in accordance with the light, quantity detection signal meeting the light quantity from a light source. SOLUTION: When the glass in the downflow nozzle 12 is completely fused, the fused glass flows down nearly perpendicularly from the downflow nozzle 12. At this time, the respective light beams 48, 49 from a first light emitting source 42 and a second light emitting source 44 are shut off by the flowing down fused glass. The quantity of the incident light on light quantity detectors 43, 45 corresponding to the respective light beams 48, 49 is small. Then, the current values of the light quantity detection signals 50, 51 from the respective detectors 43, 45 fall. Decision is made by a downflow state deciding device 46 that the fused glass flows perpendicular downward. On the other hand, the glass does not fall perpendicularly any more unless the glass is partly fused and, therefore, the quantities of the light beams 48, 49 to the respective light quantity detectors 43, 45 increase and the current values of the detection signals 50, 51 from the respective detectors 43, 45 increase. Decision is then made that the glass does not fall perpendicularly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molten glass flow monitoring device for detecting whether or not molten glass is being supplied from a glass melting furnace to a glass solidified body container in an appropriate state.

[0002]

2. Description of the Related Art A radioactive liquid waste generated in a nuclear facility is treated as a vitrified body by a liquid waste 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, and the downflow nozzle 1
2 is a molten glass 1 stored in the melting space 3
1 is provided at the bottom of the glass melting furnace body 1 in the up-down direction so that 1 can flow down to the outside.

A high frequency heating coil 13 for heating the downflow nozzle 12 is attached to the outer peripheral portion of the downflow nozzle 12.

When the temperature of the downflow nozzle 12 is not raised by the high-frequency heating coil 13, the glass is solidified inside the downflow nozzle 12 and the downflow of the molten glass 11 from the glass melting furnace body 1 to the outside is prevented. It is like this.

Further, when the downflow nozzle 12 is heated to the same degree as the molten glass 11 by the high-frequency heating coil 13, the solidified glass inside the downflow nozzle 12 is melted and the molten glass 11 is melted. It flows down from the furnace body 1 to the outside.

Further, a nozzle outer cylinder 14 having a short cylindrical shape is provided at the bottom of the glass melting furnace body 1 so as to surround the flow-down nozzle 12 in the circumferential direction.

Reference numeral 15 denotes a coupling device outer cylinder. The coupling device outer cylinder 15 includes a vertically extending cylindrical outer cylinder upper portion 16 connected to a lower end portion of the nozzle outer cylinder 14, and an outer cylinder upper portion 16. 16, an upper flange portion 17 provided at an outer edge of a lower end, a cylindrical outer cylinder lower portion 18 extending downward from an outer edge of the upper flange portion 17, and a lower flange provided at an inner edge of a lower end of the outer cylinder lower portion 18. And a part 19.

Reference numeral 20 denotes a coupling device inner cylinder. The coupling device inner cylinder 20 includes an inner cylinder upper portion 21 formed in an open inverted pyramid shape, and a cylindrical inner cylinder lower portion connected to a lower end portion of the inner cylinder upper portion 21. 22.

The coupling device inner cylinder 20 has an inner cylinder upper portion 21 coaxially fixed to an inner portion of an outer cylinder upper portion 16 of the coupling device outer cylinder 15, and an inner cylinder lower portion 22 formed of an outer cylinder of the coupling device outer cylinder 15. It is located inside the lower part 18.

Reference numeral 23 denotes a coupling device driving portion, and the coupling device driving portion 23 includes a weight 24 and the bellows 2 shown in FIG.
5, 26, 27.

The weight 24 is connected to the coupling device outer cylinder 15.
An annular weight main body 28 which is provided inside the outer cylinder lower part 18 so as to be able to ascend and descend and surrounds the inner cylinder lower part 22 of the coupling device inner cylinder 20 in the circumferential direction. And the lower flange 1
9 has a cylindrical body 29 protruding outside of the coupling device outer cylinder 15 from the opening, and a coupling flange portion 30 provided on an outer edge of a lower end of the cylindrical body 29.

The bellows 25, 26, 27 have different diameters as shown in FIG. 4, and the bellows 25 surrounds the cylindrical body 29 of the weight 24 in the circumferential direction.
The bellows 26 is provided in the outer tube lower portion 18 of the coupling device outer tube 15 so as to surround the bellows 25 in the circumferential direction, and further, the bellows 27 is provided so as to surround the bellows 26 in the circumferential direction.

The upper ends of these bellows 25, 26, 27 are hermetically mounted on the lower surface of the weight body 28 of the weight 24, and the lower ends of the bellows 25, 26, 27 are connected to the outer cylinder 15 of the coupling device. The lower flange 19 is hermetically mounted on the upper surface.

Further, the outer peripheral surface of the bellows 25, the bellows 2
6, lower surface of weight body 28, lower flange 1
9 is provided with an air pipe 32
The downstream end of the air pipe 34 is connected to the space 33 surrounded by the outer peripheral surface of the bellows 26, the inner peripheral surface of the bellows 27, the lower surface of the weight body 28, and the upper surface of the lower flange portion 19. (See FIG. 4).

A compressed air source (not shown) having an air compressor and a compressed air tank is connected to the upstream ends of the air pipes 32 and 34. When air pressure is applied to the spaces 31 and 33 via the pipes 32 and 34, the weight 24 rises with respect to the coupling device outer cylinder 15, and when the spaces 31 and 33 are opened to the atmosphere, the weight 24 descends by its own weight. It has become.

Reference numeral 35 denotes a metal vitrified container,
At the upper end of the vitrified container 35, an inlet 36 for filling the molten glass 11 into the vitrified container 35 from the connecting flange 30 of the weight 24 described above is provided.

Reference numeral 37 denotes a trolley.
Vitrified container 3 on rail 38 laid on
5 with the coupling device driving unit 2
The vitrified container 35 can be positioned directly below the glass melting furnace main body 1 so that 3 and the inlet 36 of the vitrified container 35 face up and down.

In FIG. 3, 39 is a shielding wall,
The operation wall 40 of the waste liquid treatment facility and the processing chamber 41 in which the glass melting furnace main body 1 and the like are disposed are hermetically partitioned by the shielding wall 39.

In the glass melting furnace shown in FIGS. 3 and 4, when the glass vitrified body container 35 is filled with the molten glass 11, air pipes 32, 3 are supplied from a compressed air source (not shown).
In a state in which air pressure is applied to the spaces 31 and 33 through the space 4 and the weight 24 is pushed upward, a bogie 37 having a vitrified container 35 mounted immediately below the glass melting furnace main body 1.
Is moved so that the cylindrical body 29 of the weight 24 of the coupling device driving unit 23 and the injection port 36 of the vitrified container 35 are vertically opposed.

Next, the spaces 31 and 33 are opened to the atmosphere through the air pipes 32 and 34 to thereby open the coupling device drive unit 2.
3 is lowered, and the cylindrical body 2 of the weight 24 is lowered.
9 is connected to the vitrified container 35
Is brought into contact with the periphery of the injection port 36 of FIG.

Further, when the downflow nozzle 12 is heated by the high frequency heating coil 13, the glass which has been solidified inside the downflow nozzle 12 is melted and the glass melting furnace body 1
The molten glass 11 stored in the melting space 3 vertically flows down from the downflow nozzle 12, and the molten glass 11 passes through the coupling device inner cylinder 20, the cylinder body 29 of the weight 24 of the coupling device drive part 23, and the injection port. From 36, the inside of the vitrified body container 35 is filled.

When a predetermined amount of molten glass 11 is filled in the vitrified body container 35, the high frequency heating coil 1
The heating of the downflow nozzle 12 by 3 is interrupted.

When the heating of the downflow nozzle 12 is interrupted, the glass is solidified inside the downflow nozzle 12, whereby the molten glass 11 from the glass melting furnace body 1 to the outside is melted.
Is prevented from flowing down.

[0035]

In the glass melting furnace shown in FIGS. 3 and 4, for example, heating of the downflow nozzle 12 by the high-frequency heating coil 13 becomes non-uniform, and the inside of the downflow nozzle 12 is solidified. If a part of the glass is not melted, the molten glass 11 may not vertically flow down from the downflow nozzle 12.

The present invention has been made in view of the above-mentioned circumstances, and it is necessary to accurately detect whether or not there is an abnormality in the flowing state of the molten glass from the flow-down nozzle of the glass melting furnace main body to the vitrified body container. It is an object of the present invention to provide a molten glass flow monitoring device capable of

[0037]

In order to achieve the above object, in the molten glass down flow monitoring device of the present invention, a first light beam is emitted substantially horizontally toward directly below a down flow nozzle of a glass melting furnace. A first light source, and a first light amount detector that faces the first light source with a space directly below the flow-down nozzle, and that detects the light amount of a first light beam incident from the first light source. , A second light emitting source that emits a second light beam so as to intersect with the first light beam in a substantially horizontal direction immediately below the downflow nozzle, and a second light emission that separates a space immediately below the downflow nozzle. A second light amount detector that faces the light source and detects the light amount of the second light beam incident from the second light emitting source, and the molten glass flows down based on the light amount detection signals output from the respective light amount detectors. Flow down state to determine whether or not it is flowing down the space directly below the nozzle And Joki, and a alarm device activated by a stream of abnormality signal output from the flow under the state determination unit.

In the molten glass flow-down monitoring apparatus of the present invention, when the molten glass stops flowing vertically from the flow-down nozzle, the light amount of the first light beam incident on the first light amount detector from the first light source, or the first light beam One of the light quantities of the second light beam entering the second light quantity detector from the second light source increases,
A first light amount detection signal output from the first light amount detector,
Alternatively, the second light amount detection signal output from the second light amount detector changes, and the alarm device is activated by the downflow abnormality signal output from the downflow state determination device.

[0039]

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

FIGS. 1 and 2 show a glass melting furnace to which an example of an embodiment of a molten glass flow monitoring device of the present invention is applied. In the drawings, a glass melting furnace main body 1 and a downflow nozzle 1 are shown.
2, the coupling device inner cylinder 20, and the vitrified body container 35 are equivalent to those shown in FIGS. 3 and 4 described above.
Those denoted by the same reference numerals as those in FIGS. 3 and 4 represent the same items.

The molten glass flow monitoring device applied to the glass melting furnace shown in FIGS. 1 and 2 includes a first light emission source 42, a first light amount detector 43, and a second light amount detector 43 installed in a processing chamber 41.
The light source 44, the second light amount detector 45, the downflow state determination device 46 installed in the operation room 40, and the alarm device 47.

A xenon lamp or a laser oscillator is used for the first light source 42 and the second light source 44.

The first light source 42 is the glass melting furnace body 1
At a predetermined position outside the nozzle outer cylinder 14 provided at the bottom of the first outer surface of the nozzle outer cylinder 14, the first light beam 4 is substantially horizontal from a through hole 52a formed in the nozzle outer cylinder 14 to a position directly below the downflow nozzle 12.
It is arranged so that 8 can be emitted.

The second light emitting source 44 is located at a position displaced by approximately 90 ° in the circumferential direction of the nozzle outer cylinder 14 with respect to the first light emitting source 42 outside the nozzle outer cylinder 14. 1
The second light beam 49 is arranged so as to be emitted substantially horizontally from the through hole 53a formed in the hole 4 directly below the downflow nozzle 12 and in a direction intersecting with the first light beam 48. There is.

A photoelectric conversion means such as a photodiode or a cadmium sulfide photoconductor (CdS cell) is used for the first light amount detector 43 and the second light amount detector 45, and each light amount detector 43, 45 is The first light amount detection signal 50 and the second light amount detection signal 51 having current values corresponding to the received light amount are respectively output.

The first light amount detector 43 is provided outside the nozzle outer cylinder 14 so as to face the first light emitting source 42 with a space directly below the flow-down nozzle 12 and to face the through hole 52a. It is arranged so as to be able to receive the first light beam 48 emitted from the through hole 52b formed in the outer cylinder 14.

The second light quantity detector 45 faces the second light emitting source 44 and faces the through hole 53a with a space directly below the flow-down nozzle 12 on the outside of the nozzle outer cylinder 14. A through hole 53b formed in the nozzle outer cylinder 14
Is arranged so as to be able to receive the second light beam 49 emitted from.

The downflow state determiner 46 is connected to the first light intensity detector 43 and the second light intensity detector 45, and outputs a first light intensity detection signal output from the first light intensity detector 43. 50 and the second light amount detection signal 51 output from the second light amount detector 45, the downflow position of the molten glass 11 with respect to the center of the downflow nozzle 12 is obtained, and the downflow position of the molten glass 11 is set in advance. When the flow rate deviates from the range, the downflow abnormality signal 54 is output.

The alarm device 47 is connected to the flow-down state determination device 46 and is activated by the flow-down abnormality signal 54 transmitted from the flow-down state determination device 46.

Next, the operation will be described.

In the glass melting furnace shown in FIGS. 1 and 2, when the glass inside the downflow nozzle 12 is completely melted by the high frequency heating coil 13, the glass is stored in the melting space 3 of the glass melting furnace body 1. The molten glass 11 flowing down flows from the downflow nozzle 12 substantially vertically, and the molten glass 11 is filled in the vitrified body container 35 through the injection port 36.

At this time, the first light beam 48 emitted from the first light emission source 42 and the second light beam 49 emitted from the second light emission source 44 are blocked by the molten glass flowing down from the downflow nozzle. To be

Therefore, the molten glass 11 becomes the downflow nozzle 12
In a state in which the first light source 42 is flowing substantially vertically from the first light source 42, the light amount of the first light beam 48 incident on the first light amount detector 43 or the second light source 44
The light amount of the second light beam 49 incident on the light amount detector 45 is small.

That is, the current value of the first light amount detection signal 50 output from the first light amount detector 43 or the second light amount detection signal 51 output from the second light amount detector 45 becomes low. In the downflow state determination device 46, it is determined that the molten glass 11 is flowing down in the space immediately below the downflow nozzle 12.

As a result, the downflow state determination device 46 does not output the downflow abnormality signal 54 to the alarm device 47, and the alarm device 47 does not operate.

On the other hand, when the molten glass 11 is filled from the glass melting furnace body 1 into the vitrified body container 35, if a part of the glass inside the flow-down nozzle 12 is not melted,
The molten glass 11 does not flow down vertically from the downflow nozzle 12.

As described above, when the molten glass 11 stops flowing vertically, the first light beam 48 incident on the first light amount detector 43 from the first light emitting source 42 according to the state.
Or the light amount of the second light beam 49 incident on the second light amount detector 45 from the second light emission source 44 increases.

That is, the current value of the first light amount detection signal 50 output from the first light amount detector 43 or the second light amount detection signal 51 output from the second light amount detector 45 becomes high. In the flow-down state determination device 46, it is determined that the molten glass 11 is not flowing down the space directly below the flow-down nozzle 12.

As a result, the flow-down condition determiner 46 outputs a flow-down abnormality signal 54 to the alarm device 47, and the alarm device 47 is activated to cause an abnormality in the flow-down of the molten glass 11. Will be announced.

Therefore, if the heating of the flow-down nozzle 12 by the high-frequency heating coil 13 is immediately stopped when the alarm device 47 is activated, the flow-down abnormality of the molten glass 11 can be minimized.

The apparatus for monitoring the flow of molten glass according to the present invention is not limited to the above-described embodiment. For example, instead of the above-mentioned first and second light emitting sources, a predetermined interval is provided in the vertical direction. A multi-layered light emitting source capable of emitting a plurality of light beams and configured to detect the flowing state of the molten glass three-dimensionally, and other various configurations without departing from the scope of the present invention. Of course, changes can be made.

[0062]

As described above, the molten glass flow monitoring device of the present invention can exhibit various excellent effects as described below.

(1) The first light amount detection signal output from the first light amount detector according to the light amount of the first light beam from the first light source, and the second light beam from the second light source. Based on the second light amount detection signal output from the second light amount detector in accordance with the light amount of, the downflow state determiner determines the state of the molten glass flowing down from the downflow nozzle, and an abnormality is found in the downflow of the molten glass. Since the alarm device is activated when it occurs, it is possible to accurately detect whether or not the flowing state of the molten glass is normal.

(2) Therefore, when the alarm device is activated,
If the injection of the molten glass into the vitrification container is interrupted, the abnormal flow of the molten glass can be minimized.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing a glass melting furnace to which an example of an embodiment of a molten glass flow monitoring device of the present invention is applied.

FIG. 2 is a view taken in the direction of arrows II-II in FIG.

FIG. 3 is a conceptual diagram showing an example of a conventional glass melting furnace.

FIG. 4 is a detailed view of a coupling device outer cylinder, a coupling device inner cylinder, and a coupling device drive unit of the glass melting furnace shown in FIG.

[Explanation of symbols]

 11 Molten Glass 12 Downflow Nozzle 42 First Light Source 43 First Light Quantity Detector 44 Second Light Source 45 Second Light Quantity Detector 46 Downflow Status Judge 47 Alarm 48 First Light Beam 49 Second Light beam 50 First light amount detection signal 51 Second light amount detection signal 54 Downflow abnormality signal

Claims (1)

[Claims] 1. A first light emitting source which emits a first light beam in a substantially horizontal direction directly below a downflow nozzle of a glass melting furnace,
A first light amount detector that faces the first light emitting source across a space directly below the downflow nozzle and detects the light amount of a first light beam incident from the first light emitting source; and a first light amount detector immediately below the downflow nozzle. The second light beam is directed substantially horizontally and intersects the first light beam.
Second light source that emits the second light beam and a light amount of the second light beam that faces the second light source with a space directly below the downflow nozzle and that is incident from the second light source is detected. Second
Light amount detector, a flow-down state determiner for determining whether or not the molten glass is flowing down the space immediately below the flow-down nozzle based on the light amount detection signal output from each light amount detector, and the flow-down state determiner And a warning device which is activated by a downflow abnormality signal output from the molten glass downflow monitoring device.