论文部分内容阅读
沙钢宏发炼铁厂1号高炉因炉缸侵蚀于2011年1月进行大修。炉缸内第6、7层碳砖侵蚀最严重,呈异常三角形侵蚀。通过对炉缸碳砖的分析和操作条件的模拟,发现高炉锌负荷过高和铁水环流是加剧炉缸侵蚀的主要原因。宏发高炉的锌负荷偏高,使ZnO在炉缸第6、7层碳砖中严重富集,导致碳砖导热系数下降,热膨胀系数增加,加剧碳砖的熔蚀和热应力引起的侵蚀。另外,由于原料质量和操作原因,使得宏发高炉的铁口长度较短、无焦区偏小和死料柱的透气透液性有时较差,加剧了铁水环流对炉缸的侵蚀。可以通过控制入炉锌负荷,延长铁口长度、控制死料柱的尺寸、提高焦炭质量和控制合适的喷煤比来改善炉缸的侵蚀。
Sha Steel Hongfa Ironworks No. 1 blast furnace due to furnace erosion in January 2011 for overhaul. The 6th and 7th carbon brick in the hearth is the most eroded, with anomalous triangular erosion. Through the analysis of the furnace carbon brick and the simulation of the operating conditions, it is found that the high zinc load and the hot metal circulation in the blast furnace are the main reasons that aggravate the erosion of the hearth. Acer Asahi blast furnace zinc load is too high, so ZnO in the hearth 6,7 layer carbonaceous brick serious enrichment, resulting in the thermal conductivity of carbon brick decreased, the thermal expansion coefficient increases, exacerbating the erosion of carbon brick erosion and thermal stress. In addition, due to the quality of raw materials and operating reasons, making the length of the iron mouth of Hongfa blast furnace is short, the non-coke zone is too small and the permeability of the dead material column is sometimes poor, which aggravates the erosion of the hearth by the molten iron circulation. Boiler erosion can be improved by controlling the zinc load in the furnace, extending the length of the nozzle, controlling the size of the dead column, increasing the coke quality, and controlling the proper PCI ratio.