管板厚度对挠性薄管板温度场及应力场影响的有限元分析  

FINITE ELEMENT ANALYSIS ON THE INFLUENCE OF TUBE SHEET THICKNESS ON TEMPERATURE FIELD AND STRESS FIELD OF FLEXIBLE THIN TUBE SHEET

作　　者：叶增荣 Ye Zengrong(Nanjing Jinling Petrochemical Engineering Co.,LTD.,Nanjing,Jiangsu,210042)

机构地区：[1]南京金凌石化工程设计有限公司,江苏南京210042

出　　处：《石油化工设备技术》2023年第1期5-11,I0001,共8页Petrochemical Equipment Technology

摘　　要：针对某余热锅炉的挠性薄管板,分别建立不同管板厚度的有限元模型进行温度场分析和应力分析。温度场分析结果表明,管板厚度变化主要影响管板布管区的温度分布。随着管板厚度的增加,管板布管区在管程侧表面的金属壁温将持续升高,管板布管区两侧的金属壁温差也将不断增大,从而引起管板布管区的金属表面可能出现超温现象。此外,P s工况和P s+ΔT工况下的应力分析结果表明:管板厚度的增加主要影响管板非布管区内的弯曲应力值,对管板其他部位(包括管板周边圆弧过渡段处)的应力水平影响则较小;P s工况下,管板厚度的增加使管板非布管区内的弯曲应力显著降低;而P s+ΔT工况下,管板厚度的增加则将使管板非布管区内的一次加二次应力明显减小,但其影响程度随着管板厚度的增加而不断减弱。Aiming at the flexible thin tube plate of one waste heat boiler,finite element models with different tube plate thicknesses are established respectively for temperature field analysis and stress analysis.The results of temperature field analysis show that the change of tube sheet thickness mainly affects the temperature distribution on the pipe layout area.With the increase of the tube sheet thickness,the metal temperature rises continuously on the tube side of the pipe layout area and the metal temperature difference on both sides also continues to increase.This may cause the overheating on the metal surface of the pipe layout area.In addition,stress field analysis results under P s and P s+ΔT calculation conditions show that the increase of tube sheet thickness mainly affects the bending stress value on the non-pipe layout area of the tube sheet,and the influence on the stress level on the other parts of the tube sheet is relatively small,including the arc transition section.Under P s calculation conditions,the increase of tube sheet thickness significantly reduces the bending stress on the non-pipe layout area of the tube sheet;under P s+ΔT calculation conditions,the increase of tube sheet thickness also reduces the primary plus secondary stresses on the non-pipe layout area of the tube sheet.However,the degree of influence decreases with the increase of tube sheet thickness.

关 键 词：余热锅炉 挠性薄管板 管板厚度 温度场 应力场 

分 类 号：TB115[理学—数学] TK229.929[理学—应用数学]