Abstract: For the flexible thin tube sheet of one waste heat boiler, finite element analysis models including different arc radius of transition section are established. The temperature field distribution and the temperature change law at different paths of flexible thin tube sheet are analyzed. The results indicate that the temperature distribution of the flexible thin tube sheet is obviously different from that of the thick tube sheet. For the flexible thin tube sheet, the temperature along the axial direction is linearly distributed, but the temperature along the radial direction shows a gradient decreasing trend. In addition, different models of the flexible thin tube sheet with different corner radius are analyzed under P_s and P_s+ΔT calculation conditions. The results show that with the increase of corner radius, the stress conditions at the arc transition section and the nonpipe layout area are improved obviously, but under P_s+ΔT calculation conditions, the stress at the tube layout area and the axial stress of heat exchange tube is increased significantly.

Key words: waste heat boiler, flexible thin tube sheet, arc transition section, corner radius, finite element analysis