JP2005082417A - Glass melting furnace - Google Patents

Abstract

An object of the present invention is to make it possible to effectively heat and melt glass under a brick scrap stopper at the bottom of a glass melting furnace.
SOLUTION: A main electrode 3 which is disposed opposite to an intermediate portion in the vertical direction of an inner wall of a melting furnace main body 2 made of refractory bricks 2a and heats and melts the raw glass in the melting furnace main body 2 by energization between them, and a furnace bottom 4 The bottom electrode 5 which is disposed on the outer periphery of the glass outlet 9 and which heats and melts the glass of the furnace bottom 4 by energization with the main electrode 3, and the brick dust stopper 13 which is disposed above the bottom electrode 5 in the furnace bottom 4 The high frequency heating coil 14 was embedded in the refractory brick 2a around the bottom electrode 5 and provided.
[Selection] Figure 1

Description

  The present invention relates to a glass melting furnace installed in a highly radioactive waste liquid vitrification facility.

  The high radioactive waste liquid generated in the nuclear facility is melted by the glass melting furnace of the high radioactive waste liquid glass solidification facility, treated as a glass solid, and then stored in the radioactive waste storage facility.

  In the above-mentioned glass solidification facility, when the raw glass is melted inside the glass melting furnace, the high radioactive waste liquid is mixed, and the molten glass mixed with this high radioactive waste liquid is injected into the solidification container to solidify the molten glass. Thus, a vitrified body is formed.

  FIG. 2 is a longitudinal front view showing an example of a conventional glass melting furnace, FIG. 3 is a sectional view in the III-III direction of FIG. 2, and in FIGS. 2 and 3, 2 is a melting furnace body, and the melting furnace body 2 is comprised by the corrosion-resistant firebrick 2a so that the fusion | melting space 1 may be formed inside.

  On the left and right sides of the upper and lower middle part of the melting furnace body 2, a main electrode 3 is provided to face the inner end of the melting furnace body 2, and its inner end protrudes into the melting space 1. The bottom electrode 5 is provided, and the inner end (upper end) projects into the melting space 1. In FIG. 2, 6 is a raw material supply port for supplying raw glass, high radioactive waste liquid, etc. provided at the upper part of the melting furnace body 2, 7 is a waste gas take-out pipe, 8 is a waste gas treatment device, and 9 is molten. A glass outlet for taking out the glass downward, 10 is a high-frequency coil for heating the glass outlet 9, and G is molten glass.

  In the glass melting furnace, it is conceivable that the refractory brick 2a forming the melting space 1 is damaged and falls to the furnace bottom 4. When the brick falls in this way, the dropped brick may block the glass outlet 9, and in this case, there is a problem that the operation of the glass melting furnace becomes impossible. And when the situation where the brick falls and closes the glass outlet 9 in this way occurs, the glass melting furnace has high radiation, so the operator cannot approach, so a manipulator or the like There is a problem that it takes a long time to perform the recovery work.

  In order to solve such a problem, in recent years, a ring member 11 positioned at the upper part of the glass outlet 9 as shown in FIGS. It is practiced to provide a brick waste stopper 13 composed of a frame material 12 that fixes 11 to the bottom electrode 5. The brick scraper 13 is made of a conductive material equivalent to the bottom electrode 5 and is fixed to the bottom electrode 5 integrally. Various types of brick scrapers 13 are conceivable. Even in the illustrated case, the size of the opening of the ring member 11 and the interval between the frame members 12 provided in a radial manner are selected and used.

  The raw material glass supplied into the melting furnace main body 2 together with the high radioactive waste liquid from the raw material supply port 6 in FIG. 2 is melted by Joule heat by energization (discharge) between the main electrodes 3 and 3 arranged opposite to each other.

  On the other hand, when the molten glass is caused to flow downward from the glass outlet 9, the main electrode 3 and the bottom electrode 5 are energized (discharged), and the glass at the furnace bottom 4 is heated to a predetermined temperature or more by Joule heat. In addition, the glass outlet 9 is heated by the high-frequency coil 10 to fluidize and flow down the glass.

In addition, as a well-known general glass melting furnace, there exists what was shown, for example in patent document 1. FIG.
JP 2002-328197 A

  However, as shown in FIG. 2, when the main electrode 3 and the bottom electrode 5 are energized to increase the temperature of the glass in the furnace bottom 4 to fluidize and flow down from the glass outlet 9, 3 flows to the brick debris stopper 13 that is easy to flow because the distance to the main electrode 3 is short. For this reason, it becomes difficult for Joule heat to be imparted to the glass on the lower side A than the brick debris stopper 13 and the contribution of heating by the high-frequency coil 10 to the lower side A part is small. Since the glass was not heated, it was not fluidized effectively, and there was a risk of hindering the flow down to the glass outlet 9.

  An object of the present invention is to provide a glass melting furnace that solves such problems and that can effectively heat and melt the glass below the brick scrap stop at the bottom of the glass melting furnace.

  The present invention comprises a main electrode that is disposed opposite to an intermediate part in the vertical direction of the inner wall of a melting furnace main body made of refractory bricks, and heats and melts the raw glass in the main body of the melting furnace by energization between each other, and a glass outlet outer periphery of the furnace bottom In a glass melting furnace having a bottom electrode that heats and melts the glass at the bottom of the furnace by energization with the main electrode and a brick scrap stopper disposed above the glass outlet of the bottom electrode, The present invention relates to a glass melting furnace characterized in that a high-frequency heating coil is embedded in a refractory brick.

  In the present invention, the bottom electrode is heated by a high frequency heating coil embedded in a refractory brick around the bottom electrode. Therefore, it is possible to effectively heat and melt the glass that is difficult to be melted on the lower side of the brick scrap stopper and to flow down reliably from the glass outlet.

  According to the present invention, the bottom electrode is heated by the high-frequency heating coil embedded in the refractory brick around the bottom electrode, and the glass on the bottom side of the brick scrap stopper is heated via the bottom electrode. The lower glass can be reliably melted, and therefore there is an effect that the molten glass can surely flow down from the glass outlet.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a longitudinal front view of a glass melting furnace according to an embodiment of the present invention. In the figure, the same components as those in FIGS. Only the characteristic part will be described in detail.

  As shown in FIG. 1, in a glass melting furnace in which a brick debris stopper 13 is integrally attached to the inside of a bottom electrode 5 provided at the bottom of the melting furnace body 2, the inside of the refractory brick 2 a around the bottom electrode 5. The high frequency heating coil 14 is embedded and provided. In the figure, reference numeral 15 denotes a high frequency power supply device connected to the high frequency heating coil 14.

  Next, the operation of the above embodiment will be described.

  From the raw material supply port 6, raw material glass and radioactive waste liquid are supplied into the melting space 1. Here, at the normal time, the raw glass is melted by the Joule heat generated by energization between the main electrodes 3 and 3 arranged opposite to each other, and becomes a molten glass G.

  Further, at the time of taking out the molten glass G, in order to smoothly flow down the molten glass G, current is further applied between the main electrode 3 and the bottom electrode 5 to generate Joule heat. Heat.

  However, as described above, the conductive brick debris stopper 13 is integrally fixed to the inner upper portion of the bottom electrode 5, so that the current of the main electrode 3 is close to the main electrode 3, so that it easily flows. Therefore, the glass on the lower side A of the brick scraper 13 may not be melted completely.

  Therefore, in the present invention, the bottom electrode 5 is heated by energizing the high-frequency heating coil 14 installed in the refractory brick 2a around the bottom electrode 5.

  Then, by heating the bottom electrode 5, the glass on the lower side A of the brick scraper 13 is heated via the bottom electrode 5, so that the glass on the lower side A of the brick scraper 13 is reliably melted. As a result, the molten glass G can surely flow down from the glass outlet 9.

It is a vertical front view of the glass melting furnace which concerns on embodiment of this invention. It is a vertical front view which shows an example of the conventional glass melting furnace. It is the III-III direction sectional view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Melting space 2 Melting furnace main body 2a Refractory brick 3 Main electrode 4 Furnace bottom part 5 Bottom electrode 13 Brick scrap prevention 14 High frequency heating coil

Claims (1)

  A main electrode that heats and melts the raw glass in the main body of the melting furnace by energizing each other and placed on the outer periphery of the glass outlet at the bottom of the furnace. In a glass melting furnace having a bottom electrode that heats and melts glass at the bottom of the furnace by energization with the main electrode, and a brick scrap stopper disposed above the glass outlet of the bottom electrode, in the refractory brick around the bottom electrode A glass melting furnace characterized in that a high-frequency heating coil is embedded in the glass melting furnace.

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