Blast furnace apparatus and operation method for blast furnace

An operation method for a blast furnace apparatus, the blast furnace apparatus comprising:

• a rotating chute configured to charge a raw material into the blast furnace from a blast furnace top;
• a plurality of tuyeres configured to blow hot blast and pulverized coal into the blast furnace;
• a profile measurement device configured to measure surface profiles of a burden of the raw material charged into the blast furnace through the rotating chute;
• and
• a blowing amount controller configured to control a blowing amount of at least one of the hot blast or the pulverized coal in each of the plurality of tuyeres, wherein
• the profile measurement device comprises:
• a radio wave distance meter installed on the blast furnace top and configured to measure a distance to a surface of the burden in the blast furnace;
• a first arithmetic unit configured to derive the surface profiles of the burden on a basis of distance data for the entire blast furnace related to distances to the surface of the burden obtained by scanning a detection wave of the radio wave distance meter in the blast furnace in a circumferential direction;
• and
• a second arithmetic unit configured to calculate a descent speed of the burden over an entire circumference of the blast furnace on a basis of the surface profiles of the burden, and
• the operation method comprises:
• deriving, by the profile measurement device, the surface profiles of the burden in the blast furnace in the circumferential direction;
• in a case where variation in the surface profiles derived is beyond a predetermined range,
• calculating descent speeds of the burden on a basis of the surface profiles over an entire circumference of the blast furnace,
• determining a distribution of the descent speeds in the circumferential direction of the blast furnace,
• finding a circumferential position indicative of a descent speed having a deviation of 10% or more from an average descent speed in the circumferential direction,
• selecting, on a basis of the distribution of the descent speeds in the circumferential direction of the blast furnace, at least one of the plurality of tuyeres corresponding to the circumferential position and
• adjusting the blowing amount of at least one of hot blast or pulverized coal coming therefrom for suppressing the deviation.