Title:
回転炉床式還元炉の還元鉄排出用スクリューコンベヤ
Document Type and Number:
Japanese Patent JP4866899
Kind Code:
B2
Abstract:
[PROBLEMS] It is an object to provide a reduced iron discharging screw conveyer of a rotary hearth furnace, which can reduce maintenance frequency of the screw conveyer and improve operation rates of the rotary hearth furnace by extending wear life of a screw blade of the screw conveyer. [SOLVING MEANS] A reduced iron discharging screw conveyer 5 which is provided in a rotary hearth furnace and discharges reduced iron out of the rotary hearth furnace, the rotary hearth furnace producing the reduced iron by charging and heating a pellet including metallic oxide and coal material onto a rotary hearth rotating in a horizontal plane, the reduced iron discharging screw conveyer has a rotary shaft and a screw blade which is spirally formed on an outer surface of the rotary shaft. A lead angle ¸ of the screw blade 5a satisfies a condition of "0.46 rad ‰¤ ¸ ‰¤ 0.79 rad". A ratio (h/D) between height h of the screw blade and an outer diameter D of the screw conveyer is smaller than 0.2 and a ratio (t/h) between thickness t and height h of the screw blade is larger than or equal to 0.12.
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Inventors:
Shinji Shima
Toshitaka Nakayama
Nagatomi Masahide
Toshitaka Nakayama
Nagatomi Masahide
Application Number:
JP2008509845A
Publication Date:
February 01, 2012
Filing Date:
April 03, 2007
Export Citation:
Assignee:
Nippon Steel Engineering Co., Ltd.
Nippon Steel Plant Design Co., Ltd.
Nippon Steel Plant Design Co., Ltd.
International Classes:
F27D3/08; C21B13/10; F27B9/16; F27B9/39
Domestic Patent References:
| JPS6391484A | 1988-04-22 | |||
| JP2005061651A | 2005-03-10 | |||
| JP2002531350A | 2002-09-24 |
Foreign References:
| US4636127A | 1987-01-13 |
Attorney, Agent or Firm:
Mizuno Katsufumi
Masayuki Kishida
Hiroshin Takano
Masayuki Kishida
Hiroshin Takano