为了查明凌钢3号高炉炉缸在炉役中侧壁砖衬温度高达900℃而二段热负荷大多低于10 000 W/m2的原因,通过传热学建模分析了炉缸传热和侵蚀的影响因素.采用可检测微小水温差波动的无线高精度数字化在线监测系统和吸附式无线炉皮测温系统,实现了对炉缸安全状态的准确监测.结果表明:炉缸侧壁热阻过大,尤其是炭砖和冷却壁间的填料层过厚是炉缸侵蚀加剧而水温差较低的主要原因,水速调整对“隔热”型炉缸侵蚀影响较小,稳定冶炼强度及改善炉缸透液性是抑制侵蚀的有效措施.
To investigate the reason for that brick temperature at hearth sidewall was as high as 900 ℃ while thermal load values at the second segment were mostly lower than 10 000 W/m2 during the campaign of No.3 blast furnace in Linggang,the factors affecting heat transfer and erosion of hearth sidewall were studied by heat transfer modeling.By means of wireless digital monitoring system for detecting tinny water temperature difference and wireless adsorption measurement for shell temperature,accurate monitoring on hearth safety is realized.Results show that severe erosion but low temperature difference is mainly caused by big heat resistance due to too thick filling layer between bricks and cooling staves at hearth sidewall.Adjustment of cooling water rate has little effect on heat resistance hearth.Stabilization of smelting intensity and improvement of hearth permeability are effective measures for restraining hearth erosion.
参考文献
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