Title:
SCREW CONVEYOR FOR DISCHARGING REDUCED IRON FROM ROTARY HEARTH REDUCTION FURNACE
Document Type and Number:
WIPO Patent Application WO/2007/116878
Kind Code:
A1
Abstract:
A screw conveyor for discharging reduced iron from a rotary hearth reduction furnace
in which the rate of operation of the rotary hearth reduction furnace can be enhanced
by prolonging the abrasion life of the screw blades of screw conveyor thereby
reducing maintenance frequency of the screw conveyor. In the screw conveyor
(5) which is disposed in the rotary hearth reduction furnace for producing reduced
iron by loading a pellet composed of a metal oxide and a carbon material onto a rotary
hearth rotating in a horizontal plane and then by heating (reduction), and which
discharges reduced iron to the outside of the furnace, a rotating shaft and screw
blades formed spirally on the outer circumference of the rotating shaft are provided,
and the lead angle θ (rad) of the screw blade (5a) is set to satisfy the condition
0.6 rad≤θ≤0.79 rad. Furthermore, the ratio (h/D) between
the height (h) of the screw blade and the outside diameter (D) of the screw conveyor
is set smaller than 0.2, and the ratio (t/h) between the thickness (t) and the height
(h) of the screw blade is set at 0.12 or above.
Inventors:
SHIMA, Shinji (46-59, Oaza-Nakabaru, Tobata-ku, Kitakyushu-sh, Fukuoka 85, 8048585, JP)
嶋 真司 (〒85 福岡県北九州市戸畑区大字中原４６－５９ 新日鉄エンジニアリング株式会社内 Fukuoka, 8048585, JP)
NAKAYAMA, Toshitaka (46-59, Oaza-Nakabaru, Tobata-ku, Kitakyushu-sh, Fukuoka 85, 8048585, JP)
嶋 真司 (〒85 福岡県北九州市戸畑区大字中原４６－５９ 新日鉄エンジニアリング株式会社内 Fukuoka, 8048585, JP)
NAKAYAMA, Toshitaka (46-59, Oaza-Nakabaru, Tobata-ku, Kitakyushu-sh, Fukuoka 85, 8048585, JP)
Application Number:
JP2007/057442
Publication Date:
October 18, 2007
Filing Date:
April 03, 2007
Export Citation:
Assignee:
NIPPON STEEL ENGINEERING CO., LTD. (46-59, Oaza-Nakabaru Tobata-ku, Kitakyushu-sh, Fukuoka 02, 8040002, JP)
新日鉄エンジニアリング株式会社 (〒02 福岡県北九州市戸畑区大字中原４６番地の５９ Fukuoka, 8040002, JP)
NITTETSU PLANT DESIGNING CORPORATION (46-59, Oaza-Nakabaru Tobata-ku, Kitakyushu-sh, Fukuoka 02, 8040002, JP)
日鐵プラント設計株式会社 (〒02 福岡県北九州市戸畑区大字中原４６番地の５９ Fukuoka, 8040002, JP)
SHIMA, Shinji (46-59, Oaza-Nakabaru, Tobata-ku, Kitakyushu-sh, Fukuoka 85, 8048585, JP)
新日鉄エンジニアリング株式会社 (〒02 福岡県北九州市戸畑区大字中原４６番地の５９ Fukuoka, 8040002, JP)
NITTETSU PLANT DESIGNING CORPORATION (46-59, Oaza-Nakabaru Tobata-ku, Kitakyushu-sh, Fukuoka 02, 8040002, JP)
日鐵プラント設計株式会社 (〒02 福岡県北九州市戸畑区大字中原４６番地の５９ Fukuoka, 8040002, JP)
SHIMA, Shinji (46-59, Oaza-Nakabaru, Tobata-ku, Kitakyushu-sh, Fukuoka 85, 8048585, JP)
International Classes:
F27D3/08; C21B13/10; F27B9/16; F27B9/39
Attorney, Agent or Firm:
MIZUNO, Katsufumi et al. (721 Marunouchi-Nakadori Bldg, 2-3 Marunouchi 2-chome,Chiyoda-k, Tokyo 05, 1000005, JP)
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