| To revamp a blast furnace(BF) is required about
every 15 years, and revamp duration by a conventional method is around 130
days. JFE Steel has developed a new revamping method, so called “Large
Block Ring Construction Method.” By employing the method, the
revamp duration was remarkably reduced to a half of a
conventional one. A furnace body (10000t) was segmented
into blocks of 10 t to 20 t weight during dismantling
and installation in conventional method. Blocks by
the Large Block Ring Constitution Method weigh over
2000 t a piece. Consequently, the revamp duration of
No. 6 BF at East Japan Works(Chiba) in 1998 was only
62 days, which was the world shortest record of revamp
duration. The method was also successfully adopted to
No. 5 BF at West Japan works (Fukuyama) in 2005, and
established a new world record of 58 days. |
