Abstract
Permeability in the blast furnace is maintained by lump coke, which has an average size of 5 cm and DI3015>90. Lnmp coke size is determined mainly by the growth of fissures from the wall side to the center of the coke oven, the formation behavior of which depends on the opereting conditions. In the formation process, microfissures are simultaneously formed in all directions and their formation behavior also influences the size of lump coke for the blast furnace. In this study we estimate the deformation behavior and thermal stress distribution of lump coke by assuming the size of lump coke formed in the coke oven and the conditions required for fissure propagation, considering radiative heat transfer within the fissure. The vertical tensile stress is estimated to reach about 10 to 20 MPa near the wall side. The fissure formation behavior regarding the growth of fissures arising from the wall side is successfully estimated. No longitudinal fissure formation is recognized, since only the compressive stress is predicted.
