In order to standardize the coke properties necessary in the blast furnace and to establish the control technologies of hot metal components by clarifying the changes in characteristics of coke and behaviors of hot metal and slag at the lower part of the blast furnace, a sampler, which is able to sample in-furnace molten materials at the tuyere level during the outage (for regular inspection and maintenance), was installed at No. 2BF (Inner volume of 2 828 m3, hearth diameter of 11.5 m) in Fukuyama Works.
The following results were obtained ;
(1) The coke temperature of the raceway is influenced by not only the theoretical flame temperature calculated by Ramm's equation but also the distribution of burden and gas flow.
(2) In the vicinity of the raceway, the higher the Coke Reaction Index (CRI) is, the more the coke size decreases, and the average disintegrated rate at the lower part of a blast furnace will be increased accordingly.
(3) Silicon content in the dropping zone depends upon the temperature and is affected by CRI.
(4) A presumed equation of a static hold-up (hs) can be obtained as follows :
hs=0.20·Gam0.102·Cpm-0.387
where Gam : Modified galilei No., Cpm : Modified capillary No.
