Structural Analysis and Optimization of Transition Section of Convex Tube Sheet

Abstract:

The convex tube sheet which is used in heat recovery boiler consists of three parts: the high temperature tube sheet, the low temperature tube sheet and the transition section.Three-dimensional finite element model of convex tube sheet in new type of heat recovery boiler is established in this paper. Using the ANSYS Workbench software, thermal stress of the convex tube sheet is analyzed. The temperature fields and thermal stress distribution of convex tube sheet are obtained, and its structure strength is checked. The effects of the high temperature tube sheet thickness, low temperature tube sheet thickness and transition section thickness on the maximum equivalent stress of the convex tube sheet are analyzed. The results show that: temperature of most parts of convex tube sheet is close to the tube side fluid temperature, and the large temperature gradient only existed in the thinner regions of shell side of convex tube sheet; temperature distribution shows obvious skin effect. At the transition section, the temperature along the thickness direction is more evenly distributed, with little change in temperature gradient; larger thermal stress mainly concentrated at tube layout area which close to the shell side of the high temperature tube sheet and the connecting parts of transition section and low temperature tube sheet in the tube side. Through checking the strength intensity, convex tube sheet structural strength meets the requirements.The transition section thickness are optimized. The optimum thickness of the transition section analyzed in this paper is 31mm.

• Periodical: Applied Mechanics and Materials (Volume 853)
• Pages: 356-360
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.853.356
• Online since: September 2016
• Authors: Zun Chao Liu*, Ke Wang, Tong Liu, Wei Feng Xu, Min Shan Liu
• Keywords: Convex Tube Sheet, Optimization, Strength Intensity, Structural Analysis, Thermal Stress, Tube Sheet

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