JP2003327433A - Glass fusing furnace - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a glass fusing furnace which can avert the deposition of platinum group elements. <P>SOLUTION: Three or more inclined walls 21, right side junctures which can be touched by the left side marginal end faces of these inclined walls 21, and corner members 22 having left side junctures which bend to be integrally continuous with the right side junctures and can be touched by the right side junctures of the inclined walls 21 are composed of refractory materials. The inclined walls 21 and the corner members 22 are alternately arranged to circumferentially encircle the fusing space to be formed and thereafter the marginal end faces of the inclined walls 21 and the juncture of the corner members 22 are butted against each other to form the fusing space downwardly narrowed in the horizontal opening section. Since the right side junctures and left side junctures of the corner members 22 are integrated, gaps are not formed between both the junctures and the deposition of the platinum group elements to the corner members 22 can be averted. <P>COPYRIGHT: (C)2004,JPO

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 Waste liquid generated by reprocessing spent fuel is vitrified in a waste liquid treatment facility and then stored in a waste storage facility.

FIGS. 5 to 7 show an example of a glass melting furnace of a waste liquid treatment facility. This glass melting furnace is formed of a refractory material and has a shape in which a horizontal opening cross section narrows downward from an intermediate portion in the vertical direction. The melting furnace main body 2 having the melting space 1 of FIG. 1, the heat insulating material 3 surrounding the melting furnace main body 2, and the casing 4 for housing the melting furnace main body 2 via the heat insulating material 3 are melted in the melting space 1. Store the glass G.

The melting furnace main body 2 has a trapezoidal shape 4 arranged so as to surround the lower half of the melting space 1 to be formed in the circumferential direction.
Two inclined walls 5, four rectangular vertical walls 6 placed on the upper edge surface of each inclined wall 5 and surrounding the upper half of the melting space 1 in the circumferential direction, and the lower surface peripheral portion of each vertical wall 6 It is configured with a top wall 7 that abuts the upper edge end surface and covers the melting space 1 from above.

Each inclined wall 5 is a combination of refractory bricks 8, 9 and 10. The left edge of each inclined wall 5 and the right edge of another adjacent inclined wall 5 are chamfered. And are butt-connected to each other.

Similarly, the left side edge of each vertical wall 6 and the right side edge of another vertical wall 6 adjacent to the vertical wall 6 are also chamfered and butt-connected to each other.

At the top of the melting furnace body 2, a casing 4,
The melting space 1 is formed by penetrating the heat insulating material 3 and the top wall 7 substantially vertically.
Is provided with a nozzle 11.

The tube base 11 is provided with a raw material feeder 14 which connects a supply pipe 12 for feeding the glass raw material and a supply pipe 13 for feeding the waste liquid.

A pair of main electrodes 15 are provided in the vertical middle portion of the melting furnace main body 2 so as to penetrate the casing 4, the heat insulating material 3 and the vertical wall 6 in a substantially horizontal direction and have their tips facing each other in the melting space 1. ing.

Below the melting furnace main body 2, a downflow nozzle 16 for communicating with the melting space 1 and flowing down the molten glass G to the outside of the furnace, and an induction heating coil 17 surrounding the downflow nozzle 16 in the circumferential direction, A bottom electrode 18 located at the inner bottom of the melting space 1 and an air injection pipe (not shown) capable of blowing cooling air to the downflow nozzle 16 are provided.

In the glass melting furnace shown in FIGS. 5 to 7, the glass raw material fed from the supply pipe 12 through the raw material feeder 14 into the melting space 1 is attached to the melting furnace main body 2 by a heater (not shown). ), And electric power is supplied to the main electrode 15 and the bottom electrode 18 to keep the molten glass G in the melting space 1 warm so as not to be solidified by Joule heat.

At this time, the glass is solidified in the downflow nozzle 16 and the outflow of the molten glass G from the melting space 1 to the outside of the furnace is prevented.

Further, when the glass raw material is additionally fed from the raw material feeder 14 into the melting space 1, the glass raw material is melted into the molten glass G, and in addition to this, from the supply pipe 13 through the raw material feeder 14. When the waste liquid generated by the wet reprocessing of the spent fuel is fed into the melting space 1, the waste liquid is mixed with the molten glass G.

When vitrifying the waste liquid,
A container (not shown) is arranged immediately below the flow-down nozzle 16.

Next, the downflow nozzle 16 is heated by supplying electric power to the induction heating coil 17, the glass solidified in the downflow nozzle 16 is melted, and the molten glass G mixed with the waste liquid is flown down the nozzle 16. Out into the container.

When the amount of the molten glass G filled in the container approaches the set value, the heating of the downflow nozzle 16 by the induction heating coil 17 is stopped, and if necessary, the air is injected from the air injection pipe to the downflow nozzle 16. To spray.

As a result, the glass is solidified again in the downflow nozzle 16 and the downflow of the molten glass G is stopped.

Further, when the above-mentioned container is naturally cooled by air, the molten glass G is solidified and various radioactive nuclides contained in the waste liquid are contained in the solidified glass.

[0019]

However, in the glass melting furnace shown in FIGS. 5 to 7, among the components contained in the waste liquid, the platinum group element which is not dissolved in the molten glass G is adjacent to the inclined wall. There is a concern that current may be short-circuited in the furnace by depositing in the voids between No. 5 and No. 5.

The present invention has been made in view of the above-mentioned circumstances, and an object thereof is to provide a glass melting furnace capable of avoiding the deposition of platinum group elements.

[0021]

In order to achieve the above object, in a glass melting furnace according to claim 1 of the present invention, three or more inclined walls made of refractory material and inclined walls made of refractory material. A right-sided connection portion with which the left-side edge end surface can abut, and a same number of corner members as the inclined wall having a left-sided connection portion with which the right-side edge end surface of the inclined wall abuts and is integrally connected to the right-sided connection portion and bent And alternately arranged so as to surround the melting space in which these inclined walls and the corner members are to be formed in the circumferential direction, and connect the edge portions of the opposite inclined walls and the connection portions of the corner members by butting and connecting them downward. A melting space having a narrow horizontal opening cross section is formed, and an electrode is provided below the melting space.

In the glass melting furnace according to the second aspect of the present invention, the corner member is constructed by combining a plurality of refractory bricks.

In any of the glass melting furnaces according to the first and second aspects of the present invention, a space is provided between the right and left connecting portions of the corner member by integrating them. Are not formed to avoid the deposition of platinum group elements on the corner members.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

1 to 4 show an example of an embodiment of a glass melting furnace of the present invention, in which the same reference numerals as those in FIG. 5 represent the same things.

This glass melting furnace has a melting furnace body 20 having a melting space 1 formed of a refractory material and having a shape in which a horizontal opening cross section is narrowed downward from an intermediate portion in the vertical direction.
And a casing 4 for accommodating the melting furnace body 20 via the heat insulating material 3 and surrounding the melting furnace body 20. The molten glass G is stored in the melting space 1.

The melting furnace body 20 is a melting space 1 to be formed.
Of the four trapezoidal inclined walls 21 arranged so as to surround the lower half in the circumferential direction, the corner members 22 interposed between the adjacent inclined walls 21, and the inclined wall 21 and the corner members 22 adjacent thereto. Four rectangular vertical walls 6 each mounted on the upper edge face and surrounding the upper half of the melting space 1 in the circumferential direction.
And a top wall 7 whose lower edge portion abuts the upper edge surface of each vertical wall 6 to cover the melting space 1 from above.

Each slanted wall 21 includes refractory bricks 23, 24,
The corner member 22 is a combination of refractory bricks 26 and 27.

The corner member 22 has a right-side connecting portion 22a with which the left-side edge end surface of the right-side inclined wall 21 can abut, and a right-side edge surface of the left-side inclined wall 21 that is integrally connected and bent to the right-side connecting portion 22a. Has a left-side connection portion 22b that can contact.

The inclined walls 21 and the corner members 22 are alternately arranged so as to surround the melting space 1 to be formed in the circumferential direction, and the edge surface of each inclined wall 21 and the corner member 22 opposite thereto are connected. The portions 22 a and 22 b are butted and connected to each other to form the melting space 1, and the bottom electrode 1 is formed below the melting space 1.
8 are provided.

Also in the glass melting furnace shown in FIGS. 1 to 4, electric power is supplied to the main electrode 15 and the bottom electrode 18 to heat the molten glass G in the melting furnace body 20 with Joule heat,
The molten glass G is mixed with the waste liquid fed from the feed pipe 13 through the raw material feeder 14, and the induction heating coil 17
The process of heating the flow-down nozzle 16 by means of which the molten glass G mixed with the waste liquid is caused to flow out of the flow-down nozzle 16 into the container is the same as in the conventional glass melting furnace shown in FIGS.

On the other hand, in the glass melting furnace shown in FIGS. 1 to 4, the right side connecting portion 22a of the corner member 22 is, as shown in FIG.
And the left-side connecting portion 22b are integrally configured, a space is not formed between these connecting portions 22a and 22b,
It is possible to avoid the platinum group element from being deposited on the corner member 22, and thus to prevent the short circuit of the electric current in the furnace.

The glass melting furnace of the present invention is not limited to the above-mentioned embodiment, and it goes without saying that various modifications can be made without departing from the scope of the present invention.

[0034]

As described above, according to the glass melting furnace of the present invention, since the right side connecting portion and the left side connecting portion of the corner member located at the corner portion of the melting space are integrally configured, both connections are made. Since no void is formed between the parts, the platinum group element can be prevented from being deposited on the corner member, and the short circuit of the current in the furnace can be prevented, which is an excellent effect.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example of an embodiment of a glass melting furnace of the present invention.

FIG. 2 is a view of an inclined wall and a corner member related to FIG. 1, viewed from above.

FIG. 3 is a perspective view of a sloped wall and a corner member related to FIG. 1.

FIG. 4 is a perspective view of a corner member related to FIG. 1.

FIG. 5 is a sectional view showing an example of a conventional glass melting furnace.

FIG. 6 is a view from above of the inclined wall associated with FIG. 5;

7 is a perspective view of a sloped wall in relation to FIG.

[Explanation of symbols]

1 melting space 18 Bottom electrode (electrode) 21 inclined wall 22 corner members 22a Right side connection 22b Left side connection 23 Refractory brick (refractory material) 24 Fireproof brick (fireproof material) 25 Fireproof brick (fireproof material) 26 Refractory bricks (refractory materials) 27 Fireproof brick (fireproof material)

Claims (2)

[Claims] 1. A three or more inclined wall made of a refractory material, a right side connecting portion made of a refractory material, with which a left edge end face of the inclined wall can abut, and the right side connecting portion is integrally connected and bent. And the same number of corner members as the tilted wall having a left-side connection portion with which the right edge surface of the tilted wall can abut, and the tilted walls and the corner members are alternately arranged so as to circumferentially surround the melting space in which the corner members are to be formed. In addition, the edge portions of the opposite inclined walls and the connecting portions of the corner members are butted and connected to each other to form a melting space in which the horizontal opening cross section narrows downward, and an electrode is provided below the melting space. Glass melting furnace. 2. The glass melting furnace according to claim 1, wherein a corner member is formed by combining a plurality of refractory bricks.