Numerical simulation for erosion characteristics of 2 600 m3 blast furnace hearth
ZHAO Hongbo1, WANG Fengmin1, ZHANG Fu1, CHI Chenhuan1, ZHOU Zhenxing2, ZHANG Jianliang2
1. Technical Center, Bengang Group Corporation, Benxi 117000, Liaoning, China; 2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
Abstract：The corrosion of refractory materials in blast furnace hearth restricts the longevity of furnace hearth. It is generally believed that the main reasons for the erosion of refractory materials in blast furnace hearth are hot metal circulation, thermal stress, hot metal penetration in deadman and alkali metal enrichment. In order to study the erosion characteristics of blast furnace hearth, a 1∶1 three-dimensional physical model was established based on the actual masonry structure of Bengang's No.5 blast furnace. The numerical simulation of designed furnace shape of Bengang's No.5 blast furnace hearth was carried out by ANSYS-Fluent software. Combined with the results of damage investigation, the causes of hearth erosion characteristics were analyzed, and the effects of deadman voidage and blast furnace hot metal yield on hearth flow field and temperature field were calculated. The results for distribution characteristics of hearth flow field and temperature field show that the trumpet-shaped abnormal erosion in the tap holes area is the dual effect of high-speed flow of hot metal confluence in the tap holes area and the direct contact of hot metal at high temperature. The elephant foot-like erosion under the tap hole is due to the intense scouring of hot metal circulation and eddy current in coke free zone along the side wall of blast furnace hearth. The voidage of deadman affects the circulation velocity of hot metal in "coke free zone" by influencing the flow behavior of hot metal inside the deadman. Sufficient voidage can reduce the erosion of carbon brick on the side wall of blast furnace hearth. When the blast furnace is in high yield, the increase of hot metal flow rate and the increase of hearth side wall temperature will aggravate the corrosion of carbon bricks. Therefore, high production rate must be matched with sufficient deadman voidage, improved activity of blast furnace hearth and advanced cooling performance.
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2023, Vol. 33 
