To solve a problem where an arc is not generated between a main electrode and a furnace bottom electrode of a plasma ash melting furnace and a side arc is generated between the main electrode and a furnace wall outer shell conductive part; and to solve a problem where the size of a device is increased when an auxiliary power supply circuit is formed for conduction confirmation in restart to increase a cost.
This D.C. power supply device 10 is connected between the main electrode 51 and the furnace bottom electrode 52 of the plasma ash melting furnace 50. An initial charge circuit 30 is connected to a smoothing capacitor 16 of its main rectification circuit 15; the smoothing capacitor 16 is so controlled as to be previously charged to a predetermined low voltage in starting operation; and a conduction detection means 31 for detecting a conduction state between the main electrode 51 and the furnace bottom electrode 52 from output variation of a chopper circuit 17 is formed. After conduction confirmation, the smoothing capacitor 16 is charged from the main rectification circuit 15, and ash is heated and melted by a plasma arc generated by applying a capacitor voltage between the electrodes by a direction of a plasma control panel 1.
| JP3838914 | Plasma nozzle |
| JPH07332865 | DIRECT CURRENT ELECTRIC FURNACE |
SONOBE KAORU
YABUKI MASAAKI
MIURA AKIZO
WAKAHARA TOSHIHIRO
SAKAKIBARA SHINICHI
MITSUBISHI HEAVY IND LTD
HITACHI ENG CO LTD
Kyosuke Tanaka
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