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Electric melting furnace for glassifying high-radioactive waste
| Details |
Inventors: Sasaki, Noriaki; Igarashi, Hiroshi; Endo, Noboru; Inada, Katsumi; Nakamura, Toshio; Takeuchi, Hirokazu;
Assignee: Doryoku Kaunenryo Kaihatsu Jigyodan (Tokyo, JP); Nippon Denki Garasu Kabushiki Kaisha (Shiga, JP)
Primary Examiner: Envall, Jr.; Roy N.
Assistant Examiner:
Attorney, Agent or Firm: Armstrong, Nikaido, Marmelstein & Kubovcik
An electric melting furnace for glassifying high-radioactive waste characterized in that, in a furnace for melting glass containing platinum-group elements which has an outlet of glass at the bottom part of a melting tank, the bottom of the furnace surrounding the outlet has an inclination of more than 30.degree. and not more than 70.degree. with respect to the horizontal plane toward the cullet, and the distance l.sub.1 between a surface-inside opening part of the outlet and bottom ends of at least a pair of electrodes (3a, 3b) for supplying most of power required for glass melting is a half or more, but not exceeding, of the distance (l.sub.2) between the electrodes (3a, 3b). |
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DETAILED DESCRIPTION In accordance with the present invention, in a melting furnace having an outlet for discharging glass at the bottom part of a melting tank, the bottom of the furnace surrounding the outlet has an inclination of more than 30.
degree.
and not more than 70.
degree.
with respect to the horizontal plane toward the outlet, and the distance between a furnace-inside opening part and the bottom ends of at least a pair of electrodes for supplying most of power required for glass melting is set at more than a half of the distance between the above-mentioned electrodes, and thereby the platinum-group elements can be removed and concentration of the current on the bottom of the furnace can be prevented, and thereby the electric melting furnace for glassifying the high-radioactive waste can be put in practical use.
If the distance between the bottom of the furnace and the electrodes is small, a good electrically conductive layer containing the platinum-group elements at high concentrations is formed on the bottom of the furnace, and the current across the electrodes concentrates on the bottom of the furnace, resulting in a trouble in operation of the melter.
To prevent this, the distance between the bottom ends of the electrodes and the upper surface of the furnace bottom has only to be set at more than a half of the distance between the electrodes.
This means that the distance between the bottom ends of the electrodes and the bottom of the furnace has only to be set at more than a sum of a half of the distance between the electrodes and the thickness of accumulation layer.
The thickness of the accumulation layer is expected to differ naturally depending upon the kind of waste, method and frequency of drawing-out of the accumulation or the like, and it is reasonably presumed to be about 50-100 mm.
On the other hand, when the distance between the bottom ends of the electrodes and the upper surface of the furnace bottom is made larger than the distance between the electrodes, the melting tank becomes deep and the inner capacity becomes larger than required, and thereby this not only goes against the request for smaller size and lighter weight, but also reduces the melting ability
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