For the further study of causes of erosion of BF hearth in the production process, on the basis of ther-modynamics and mechanics of materials, two-dimensional heat transfer model of blast furnace of an enterprise is established. The workbench software solved in the beginning and the end of the blast furnace hearth bottom' s temperature field distribution and the temperature field and sidewall carbon brick to obtain its radial thermal stress distribution and stress field coupling. Results showed that the"ceramic cup+microporous carbon brick"blast furnace type compound hearth bottom structure design is reasonable, the dead iron layer of thermal stress for a long time leads to the formation of the sidewall carbon brick and the collapse angle, then the collapse an-gle accelerate the ring, which is one of the main reasons for the hearth damage.%为进一步研究高炉炉缸炉底在生产过程中的侵蚀成因,对某企业2 580 m3高炉建立二维传热模型,运用软件求解得到该高炉开炉初期和炉役末期的炉缸炉底温度场分布;对侧壁碳砖进行温度场求解并与应力场耦合得到其径向热应力分布.结果表明,该企业高炉"陶瓷杯+微孔炭砖"型复合炉缸炉底结构设计合理,死铁层的长期热应力作用导致侧壁炭砖发生崩角并加速形成环裂,是炉缸破损的主要原因之一.
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