关键词: 钢包, 扩容, 结构模拟, 数值模拟, 耐火材料

Abstract: The ladle capacity expansion schemes with thinned permanent layers and working layers were numerically simulated and analyzed,and the temperature field change was researched.Thinning the permanent layer increases the heat dissipation loss of ladles,which has little effect on the temperature field and slag corrosion of refractories for the working layer of ladle walls.When thinning both the permanent layer and the working layer,the temperature of the working layer in the ladle wall area changes slightly,which has no significant impact on the service life;in the slag line area of ladles,the temperature rises and the slag corrosion intensifies in the steel holding stage;and the temperature has a large gradient during cooling,sharpening the thermal shock,thus easily leading to spalling.For ladle capacity expansion,to give consideration to both the heat dissipation and the ladle lining life,the thickness of precast blocks for the permanent layer and the working layer of ladle walls is reduced by 30 mm respectively,and the magnesia carbon bricks for slag line are subject to minor repairs,medium repairs and timely maintenance to achieve the overhaul cycle.The industrial test results show that:after ladle capacity expansion,the average molten steel capacity of ladles increases from 200 to 218 t;and under the smelting requirements of a high steel scrap ratio,the molten steel capacity of ladles can reach 220 t.

Key words: ladle, capacity expansion, structure simulation, numerical simulation, refractories