| 摘要 |
<p>PURPOSE: To easily and accurately detect molten steel level in a furnace by calculating and detecting the position of tip part of an upper electrode and the length of arc by the electrode, at the time of melting and refining steel scrap, etc., in a DC arc furnace. CONSTITUTION: Raw material 5 of the steel scrap, etc., is charged into the DC arc furnace 1 provided with the upper electrode 7 and a furnace bottom electrode 6 and DC voltage is impressed between both electrodes 6, 7 and the steel scrap is melted by arc-discharging between the tip part of the upper electrode 7 and the steel scrap, and the steel scrap is refined into the molten steel. In order to detect what the molten steel level in the furnace alaways varies by charging and melting the raw material scrap on the way of refining, the height of a holder for upper electrode 7 is measured with a detecting means 21 and the length of the electrode 7 at the part below the holder is measured with a detecting means 22. The tip position of the upper electrode 7 with these measured value is calculated with an arithmetic part 24 and also, the length of the arc 12 is calculated with an arithmetic part 23 from the arc voltage, and the molten steel level which varies always is quickly and accurately detected with a molten steel level arithmetic part 25 from the tip position of the upper electrode and the arc length.</p> |
