摘要
本文模拟了恒速上升的介质界面在焦炭塔内沿塔壁爬升的动态边界工况 ,对其在壁中引起的径向和轴向二维瞬态温度场及相应的应力应变场进行了有限元计算分析。结果表明 :进油和进水冷焦过程在塔内液面上方附近产生了很大的等效应力 ,导致器壁发生弯曲变形。冷焦水在塔壁上造成的径向温差、轴向温度梯度及其应力均明显地大于进油过程。当水温较低时 ,液面附近的筒节外表面产生永久的塑性变形。在进热油和进冷焦水的过程中 ,内外壁间温差最大的部位分别出现在界面以下约 30mm和 2 5mm处 ,对不同水温以及不同求解方法的某些结果进行了比较。
A model for the moving medium climbing along the inside-wall of the coke tower at a steady rate has been set up, and the resulting two-dimension kinetic temperature field and its stress or strain of the shell in radial and axial directions has been calculated and analyzed by FEM. The relation between the material physical properties of the shell and its temperature has been considered. The results showed that both the hot oil and the cooling water caused great stress in the shell above and nearby the liquid level, which made the shell deformed.Comparisons about the results caused by different water-temperature or different calculating methods were discussed. Finally, a qualitative analysis of errors has been provided.
出处
《压力容器》
2001年第4期16-21,共6页
Pressure Vessel Technology
