Patent ID: 11940215
Assignee: JFE STEEL CORPORATION
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC F  B  C  G | IPC B  C  F  G

Claim 5:
6. An operation method for a blast furnace using a blast furnace apparatus comprising:
a rotating chute configured to charge a raw material into a blast furnace from a blast furnace top;
a profile measurement device configured to measure surface profiles of a burden charged into the blast furnace through the rotating chute; and
a tilt angle controller configured to control a tilt angle of the rotating chute,, wherein
the profile measurement device comprises a radio wave distance meter, which is installed on the blast furnace top and configured to measure a distance to the surface of the burden in the blast furnace, and derives 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
the profile measurement device comprises at least one of
an arithmetic unit configured to command, on a basis of the surface profiles obtained, the tilt angle controller to change the tilt angle of the rotating chute during rotation,
an arithmetic unit configured to command, on a basis of the surface profiles obtained, a speed controller to change a rotational speed of the rotating chute during rotation, or
an arithmetic unit configured to command, on a basis of the surface profiles obtained, a speed controller to change a feed speed of the burden fed to the rotating chute during rotation,

the operation method comprising:
charging ore and coke from the rotating chute into the blast furnace;
deriving, by the profile measurement device, surface profiles of the burden; and
in a case where variation in the surface profiles derived, or variation in descent speeds of the burden derived from the surface profiles derived or variation in ore layer thickness ratios, is greater than a predetermined value, adjusting either or both of a charge position of at least one of ore or coke charged through the rotating chute and a charge speed of at least one of ore or coke charged through the rotating chute.