Blast Furnace Operation and Burden Distribution Control with Bell-less Top of the 3 Parallel Bunker Type

Abstract

No. 3 blast furnace (3rd campaign) equipped with 3 parallel bunker bell-less top, first in Japan, was blown in June 19th, 1990 at Mizushima Works, after revamping for 111 days.
The characteristics of the charging system which strengthens the behavior discharging fine materials first and coarse materials later, are the segregation control plates to control burden surface profile in the bunkers, the multi batch charging facilities, and the two size fraction charging equipment for sinter.
The new burden distribution control technique are described as follows.
(1)The dynamic control of material flow rate during charging.
(2)The two size fraction charging of sinter with short terrace.
(3)The coke vertical charging aimed at simple control of ore/coke at central region.
With the adaptions of improvements, the increase in the consumption of small size materials recycled from fines under screens was performed keeping high productivity.