| 摘要 |
PURPOSE:To improve the hit rate of a molten steel temp. in the stage of blowing out by measuring the temp. increase rate of a molten metal by the secondary combustion efficiency of CO in an oxygen top blowing furnace from the result of the measurement of the CO2 concn. in a converter exhaust gas at the time of making decarburization refining of the molten iron to the molten steel in said furnace. CONSTITUTION:The exhaust gas formed by the decarburization reaction contains CO at the time of charging the molten steel into the oxygen top blowing furnace and blowing oxygen into the molten steel by a top blowing lance to oxidize and remove the C in the molten iron, thereby refining the molten iron to the molten steel. The CO is secondarily burned by the oxygen from the top blowing lance to form CO2. The molten steel is heated up by the combustion heat thereof. The decarburization reaction efficiency by O2 and the secondary combustion efficiency of the CO are nearly constant when the height of the top blowing lance is maintained constant throughout the entire decarburization efficiency and therefore, the influence to be exerted to the blowing out temp. of the molten steel is exactly estimated by measuring the concn. of CO2 in the exhaust gas as the influence that the heat by the secondary combustion of the CO exerts to the molten steel temp. is nearly constant. The hit rate of the molten steel temp. in the stage of blowing out is thus improved.
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