METHOD FOR OPERATING SHAFT FURNACE

Title:

METHOD FOR OPERATING SHAFT FURNACE

Document Type and Number:

WIPO Patent Application WO/1997/027337

Kind Code:

A1

Abstract:

A method for operating a shaft furnace which comprises charging the furnace with an iron source having a low degree of metallization and thus requiring reduction, an iron source having a high degree of metallization and thus requiring nothing but melting, and a solid fuel, and blowing an oxygen-containing gas at ordinary or higher temperature up to 600 �C into the furnace through tuyeres to reduce and melt the iron sources. The optimal values of 'eta'co (gas utilization factor) are determined from the average degree of metallization of the iron sources, and the shaft furnace is controlled so that the effluent gas from the furnace has the optimal 'eta'co values. The control is accomplished by regulating the height of the charge, regulating the height of the coke bed, etc., using multistage tuyeres, and radially partitioning the charge. Thus, the iron sources can be efficiently reduced and melted at a low fuel ratio.

Inventors:

NAITO MASAAKI (JP)
KONNO NORIMITSU (JP)
FUJIWARA YASUHIKO (JP)
ARAKI KYOICHI (JP)
KOKUBUN TERUHIKO (JP)
OBARA TADASHI (JP)
OBARA YASUSHI (JP)

Application Number:

PCT/JP1997/000164

Publication Date:

July 31, 1997

Filing Date:

January 24, 1997

Export Citation:

Click for automatic bibliography generation Help

Assignee:

NIPPON STEEL CORP (JP)
NAITO MASAAKI (JP)
KONNO NORIMITSU (JP)
FUJIWARA YASUHIKO (JP)
ARAKI KYOICHI (JP)
KOKUBUN TERUHIKO (JP)
OBARA TADASHI (JP)
OBARA YASUSHI (JP)

International Classes:

C21B5/00; C21B11/02; C21B13/02; C21C5/56; (IPC1-7): C21B11/02

Foreign References:

JPH08199213A	1996-08-06
JPH01290711A	1989-11-22
JPH0480312A	1992-03-13

Other References: