BLOWING CONTROL METHOD OF CONVERTER-TYPE DEPHOSPHORIZATION REFINING FURNACE AND BLOWING CONTROL DEVICE

摘要

A blowing control method for a converter type dephosphorization refining furnace according to the present invention includes: an in-furnace oxygen accumulation amount calculating step of calculating the amount of oxygen accumulated in a furnace, based on blowing conditions including the feed amount of oxygen and the charging amount of auxiliary material for a converter type dephosphorization refining furnace, measurement results of the converter type dephosphorization refining furnace including the flow rate and the component concentration of exhaust gas in the converter type dephosphorization refining furnace, and analytical values of components and the temperature of molten iron; a feature point extracting step of sequentially monitoring the change of the amount of oxygen accumulated in the furnace during a blowing treatment and extracting a feature point of fluctuations in the amount of oxygen accumulated in the furnace; a blow end oxygen amount determining step of determining the amount of oxygen at blow end until the blowing treatment is completed, based on the feature point extracted at the feature point extracting step; and a control step of completing the blowing treatment at the timing at which the accumulated feed amount of oxygen fed into the converter type dephosphorization refining furnace has reached the amount of oxygen at blow end determined at the blow end oxygen amount determining step.