Influence of inner wall profile on descending and melting behavior of burden in blast furnace.

Abstract

The influences of the inner wall profile and ore/coke distribution on the descending and melting behaviors of burden were analyzed by using a three-dimensional semicircular warm modei of the blast furnace under conditions set as similar as possible to the physical phenomena in the furnace. It For decreasing the thickness of the sluggishly descending zone near the wa[1, the orelcoke near the wallshould preferably be increased as far as the heat-flow ratio is permitted.Such a burden distribution iseftective for pulverized coal injection operation in which the melting capacity near the wall is large.

Analyses of solid flow in latest design COREX shaft furnace by physical simulation

“…In the past, much research work has been carried out to understand the solid flow characteristics in blast furnaces operated under different conditions, [5][6][7][8][9][10][11][12][13] while few researchers 14,15 have studied solid flow in a COREX shaft furnace due to its short history and few instruments. Lee 14 investigated the solid flow profile and timeline of packed beds in a shaft furnace with and without a guiding cone.…”

Numerical Analysis of Factors Affecting the Burden Surface and Porosity Distribution in the Upper Part of the Blast Furnace

“…For burden bed areas (1 and 2) without inclined parts, the change of porosity is not obvious. Overall, from the bottom to the top of the burden bed, the porosity increases as a result of the compacting caused by the weight of the overlaying burden and percolation of small particles into the void between large particles [50]. However, the porosity shows a sudden increase in the region (Area 3) where the coke layer is above the sinter layer due to lack of a mixed layer.…”

Numerical Investigation of the Radial Ore‐to‐Coke Ratio in the Blast Furnace Throat during Nonuniform Burden Descent

“…Some experimental studies on the gas-solid flow have indicated that there is a plug flow zone in the top part of furnace, where the particles descend uniformly. [9,13,14] However, the burden descent sometimes becomes erratic due to, e.g., the formation of accretions [15] caused by the solid material adhering to the wall, which in extreme cases may lead to hangings and slips. [14] Such abnormal conditions influence the distribution of the burden descent at the top.…”