Shaft furnace having means for charging and adjusting a pre-mixture of ore and coke
AssigneeKawasaki Steel Corporation
InventorsNorio Fukushima, Yasunori Serizawa, Kazuhiko Yoshida, Shigeyasu Suzuki, Masanobu Masukawa, Shoji Sakurai
Life of this patent
Estimating the term…
Abstract
A method for operating a shaft furnace is performed by charging different ore/coke ratio mixture in radially different positions in the furnace. The ore/coke mixture ratio may be determined according to desired heat distribution in radial direction. For this, at least two mutually independently determined ore/coke mixture ratio mixtures are provided in each charge cycle of the burden. The mixture to be charged in the central portion of the furnace may have a higher coke content or a lower ore content for better permeability to the heating gas.
Claims15
A system for performing smelting operations comprising:
- first means for supplying ore and coke for preparing a pre-mixture to charge in a shaft furnace;
- second means for charging the pre-mixture of said ore and coke to said shaft furnace, said second means including a single chute to distribute the pre-mixture over varying radial cross-sections of said furnace;
- third means for introducing a heating gas through tuyeres for heating the burden in said shaft furnace for obtaining molten pig metal;
- and
- fourth means for adjusting the mixture ratio of said ore and coke so that the ore/coke mixture ratio in the central portion of the furnace is different from that in the circumferential portion of the furnace.
A system for performing smelting operations comprising:
- a chute for distributing burdens to be charged to a shaft furnace, said chute being rotatable about a horizontal axis extending through an upper portion of said furnace;
- first mixture supply means for preparing a first mixture of ore and coke to charge in a shaft furnace, which first mixture provides a first gas flow efficiency for a heating gas as charged into said shaft furnace;
- second mixture supply means for preparing a second mixture of ore and coke to charge in a shaft furnace, which second mixture provides a second gas flow efficiency for the heating gas charged into said shaft furnace, which second gas flow efficiency is lower than said first gas flow efficiency;
- third mixture charge means for charging said first mixture of said ore and coke in cooperation with said chute to the central portion of said shaft furnace;
- and
- fourth mixture charge, means for charging said second mixture of said ore and coke in cooperation with said chute to the circumferential portion of said shaft furnace.
The system as set forth in claim 29, further comprising means for determining said predetermined gas flow efficiency in the center of the furnace at a possible minimum value for providing possible minimum heat value which is enough to effectively perform smelting operation.
Dependencies are inferred from the claim text.