不同冷却壁与炭砖组合结构高炉炉缸的温度场分布

Temperature distribution of blast furnace hearth with different combinations of cooling stave and carbon brick structure

本文以武钢高炉炉缸为基础,建立了不同冷却壁选型和炭砖结构炉缸的传热数学模型,并对各炉缸在烘炉、全炉役周期及炉缸自保护期的温度场进行模拟研究。结果表明,烘炉阶段通过调节冷却壁水速或水温均无法使炭捣料层温度达到其固结温度,需采用停水烘炉才能有效改善炭捣料层的固结效果;不同结构炉缸在炉役初期,当炉衬残余厚度相同时,炭砖热端温度较为接近;当炭砖热面温度降至1150℃,铸铁冷却壁+大块炭砖结构炭砖残余厚度最小,铸铜冷却壁+复合炭砖结构炭砖残余厚度最大。综合考虑使用效果和材料成本等因素,建议新建或改造高炉炉缸采用性价比高的铸铁冷却壁并搭配使用大块炭砖或复合炭砖结构。

Based on the blast furnace hearth of WISCO,the heat transfer mathematical models of hearths with different cooling stave types and carbon brick structures were estabilished,and the corresponding temperature fields of hearth models during pre-heating,whole service and self-protection period were calculated by simulation.The results show that in the drying stage,the temperature of carbon ramming layer cannot reach its consolidation temperature by simply adjusting the water speed or water temperature of the cooling stave,while the water-stop drying approach is effective in improving the consolidation effect of carbon ramming layer.For the hearths with different combination structures,the hot surface temperatures of the carbon bricks in the early stage of furnace service are close when the same residual thickness of lining is reached.When the hot surface temperature of the carbon brick drops to 1150℃,the residual thickness of the carbon brick of the cast iron stave+large carbon brick structure is the smallest,while that of the cast copper cooling stave+composite carbon brick structure is the largest.Considering factors such as use effect and material cost,it is recommended to use cost-effective cast iron cooling stave combined with large/composite carbon bricks structure for the newly built or modified blast furnace hearth.