The furnace charge, or burden, of iron-bearing materials (e.g., iron-ore pellets and sinter), coke, and flux (e.g., limestone) descends through the shaft, where it is preheated and reacts with ascending reducing gases to produce liquid iron and slag that accumulate in the hearth.
When the particles are charged into and discharged from a Paul-Wurth type hopper at a bell-less top blast furnace, the accompanied size segregation phenomenon makes important effect on the burden and gas distribution inside a blast furnace, thereby contributing to the smooth operation of the furnace.
The reacted steelmaking slag, i.e., basic oxygen furnace slag (BOFS), is suited as cement substitution material, avoiding environmental burden from the cement industry, also a CO2-intensive emission source.
Size segregation of pellets in the top bunker (hopper) of a blast furnace is an important factor affecting the radial distribution of the charged burden and indirectly also the distribution of gas in the shaft and cohesive zone.
COREX shaft furnace (SF) is an industrial system that employs screw feeders; thus, the burden descending velocity and particle segregation in the SF can be directly affected by the design of screw.
This arrangement gives good control of burden distribution, since successive portions of the charge can be placed in the furnace as rings of differing diameter.
Pollutant emissions from chain grate stoker furnaces may be attributable, in the main, to poor combustion air distribution to the fuel burden.
In the OIB-standard case (Fig. 7 ), gas furnaces and high temperature industrial waste heat from the steel plant Marienhütte Stahlwerk share the main burden of heat provision (of which 10%% comes from the industrial waste heat).
The ancient furnace quit.
