Method of estimating phosphorus concentration in molten steel, converter blow control device, program and recording medium

摘要

The phosphorus concentration in molten steel at the time of decarburization process is estimated with high precision. The method for estimating the phosphorus concentration in molten steel according to the present invention is a decarburization treatment in the case where the dephosphorization treatment is not performed before the decarburization treatment using the converter, or when the dephosphorization treatment is performed by a facility different from the converter used in the decarburization treatment. It is for estimating phosphorus concentration in molten steel in the city, The exhaust gas data acquisition step which acquires exhaust gas component and exhaust gas flow rate, The molten steel data acquisition step which acquires molten steel temperature and carbon concentration in molten steel by sub lance measurement, Dephosphorization rate constants are calculated using data on decarburized oxygen efficiency obtained using exhaust gas components and exhaust gas flow rates, data on exhaust gas components, exhaust gas flow rates, molten steel temperature and carbon concentration, and operating conditions for decarburization treatment. The dephosphorization rate constant calculated and the phosphorus concentration in molten steel at the start of decarburization are used. , It includes those wherein the concentration estimation step of estimating the concentration of the molten steel in the subsequent sub-lance measurement.