OMB气化炉中托砖架热应力的数值模拟和尺寸优化

Numerical Simulation of Thermal Stress and Size Optimization of Refractory Support Frame in OMB Gasifier

建立了嵌入耐火衬里中的托砖架的三维物理模型,通过数值模拟计算了稳定运行气化炉的热面砖热端面温度为1300℃时,得到托砖架位置处的钢壳外表面温度为202.3℃,与工业数据十分匹配。结果表明:托砖盘上表面的前端温度高于后端温度,最大等效应力为上表面两侧边;使用Parameter Optimization模块对托砖盘的厚度和长度进行了优化,随托砖盘厚度增加,托砖盘前端温度减小而后端温度逐渐升高,其中心处和钢壳的等效应力逐渐减小。增加托砖盘长度,托砖盘的温度逐渐升高,其前端的等效应力先减小后增加;托砖盘最优尺寸为厚度为43 mm且长度为180 mm,该尺寸的等效应力及突变最小。

In the opposed multi-burner(OMB)gasifier,the high temperature environment in the gasifier leads to so large thermal stress of the metal refractory support frame that the frame was hard to support the refractory bricks,resulting in the collapse of the refractory bricks.The three-dimensional physical model of the refractory support frame embedded in the refractory lining was established.The numerical simulation results show that when the temperature of the end face of the hot-face brick is 1300℃during the stable operation,the temperature of the exterior surface of the steel shell at the refractory support frame is 202.3℃,which are consistent with the industrial data.In addition,the temperature of the front end of the upper surface is higher than that of the back end,and the maximum equivalent stress is on both sides of the upper surface.The parameter optimization module is used to optimize the thickness and length of the support plate.With increasing thickness of the support plate,the temperature at the front end of the support plate is decreased,while the temperature at the back end is increased,and the equivalent stress at the center of the support plate and the steel shell decreased.With the elongation of the length of the support plate,the temperature of the support plate is gradually increased,and the equivalent stress at the front of the support plate is first reduced and then increased.The thickness corresponding to 43 mm and the length corresponding to 180 mm are the optimal size of the support plate,which lead to the smallest equivalent stress and saltation.