高炉炉缸的应力分析和炉壳开裂补强判据

Stress Analysis of BF Hearth and Lining and Reinforcement Criterion for Longitudinally Cracked Shell

根据线性热弹性力学理论和高炉炉缸结构受热膨胀的力学特征,推导了平面轴对称温度分布和均布压力作用下炉缸结构的应力和变形计算式.分析炉缸结构热过盈工作状态的应力和炉壳纵向开裂补强前后的内衬应力特征,得出内衬受外缘抗拉强度控制的结果.由内衬外缘表面的强度条件,推导出满足强度要求的最小界面压力,进而提出炉壳纵向开裂补强的设计原则和炉壳补强判据.给出的算例可供计算参考.

According to the linear thermoelasticity and the mechanical characteristics of blast furnace hearth due to thermal expansion, the formulae to calculate the stress and deformation of BF hearth are deduced under the conditions that 2-D temperature distribution is axisymmetric and the pressure distribution is uniform. Analyzing the stress of BF hearth in overheating state and that of furnace lining before and after reinforcing the longitudinally cracked furnace shell, the lining strength resulting from the control of its outside tensile strength is obtained. Then, the minimum interface pressure meeting the strength requirement is derived from the outside surface strength of furnace lining, thus providing the conceptual design for reinforcing the longitudinally cracked furnace shell with a criterion for the reinforcement. A numerical example is given as reference for relevant calculation.