| 摘要 |
PURPOSE:To prevent meltdown or blocking of the furnace bottom tuyere by controlling mixing ratio of oxygen and inert gas blown from the furnace bottom tuyere according to the measureed value of melt in the converter in operation of the oxygen top blow converter having bottom blowing function. CONSTITUTION:When molten pig iron is refined to molten steel in the converter 1 having an oxygen top blowing lance and a furnace bottom tuyere, decarburization refining reactin is performed by blowing oxygen gas to melt 10 from the top blow lance and also blowing mixed gas of oxygen gas and inert gas from the tuyere 2 and stirring melt 10. In this time the temperature of melt 10 in the furnace is measured by the temperature measuring instrument 11, and the pressure of blow gas from tuyere 2 is also measured by the pressure detector 7, and these values are inputted in the flow indication operator 6a of the controller 6 and compared to the standard temperature and gas pressure set by the setting adjuster 6b. The opening of the flow adjusting values 8, 9 of the oxygen supply pipe 4 and the inert gas supply pipe 5 is regulated, an extraordinary rise of the temperature of melt 10 or the blockade of the tuyere by melt solidifying due to cooling are prevented and blow refining operation is stabilized. |
