For the purpose oj illl'estigatillg the illtemal state oj a blast Jumace ill olleratioll, H igashida No.5 B .F. ha villg the illller volume oj 646 m" was water-quenched while ill a lIormal operatillg cOlldilioll alld dissected ill 1968.This was the first attempt to dissect a commercial blast Jumace in J apall.Hirohata No.I B.F. with the ;/11le, volume oj 1 -107 m" which had beell operated with cOllsiderably high productivity, was lIext dissected ill 1970.Theil , Kukioka No .4 B.F. havillg the illller volume oj I 279 "," was dissected ill 197 1 to illvestigate the characteristics of a low coke rat;o bLast Ji/rnace.D escriptiolls oj th e dissectioll Ilrocedu re .general observatiolls all the internal stale oj these blast furnaces, characteristics oj each furnace.alld feiatiollshijlS betweell the illiemal state alld operalillg cOllditiolls are givell in this re/lort.
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Kanbara et al. (1977) studied this question.