Research on Stress Intensity of Variable Cross-Section H-Type Structure in Heat Exchanger with Longitudinal Flow of Shell Side

Abstract:

The variable cross-section H-type structure, which is used in the new type of heat exchanger with longitudinal flow of shell side, could reduce the scour action of imports fluid on the tube bundle and prevent vibration of the tube bundle. It could also improve the state of the shell side fluid flow, reducing the flow dead zone, allowing for a more efficient use of the heat transfer area and improving the energy efficiency. The new structure will make the temperature and stress distribution in the heat distribution more complex, so it is necessary to analyze the stress intensity of the variable cross-section H-type structure. A three-dimensional finite element model of the variable cross-section H-type structure is established in this paper, and the surface temperature of the various parts of the heat exchanger are determined through temperature analysis. Using ANSYS Workbench software, thermal-stress analysis of the H -type structure with different structural parameters is tested, and the temperature and stress field are obtained. The results show that a Ring plate of H-type structure has a larger temperature gradient along the thickness direction. The maximum stress of the heat exchanger is 203.13 MPa, which occurred on the connections of the ring plate and jacket in the lower temperature side. The ring plate thickness of the H-type structure has a significant influence on its maximum stress. Therefore, a reasonable selection of ring plate thickness is important for the safety of the heat exchanger.

• Periodical: Applied Mechanics and Materials (Volume 750)
• Pages: 166-171
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.750.166
• Online since: April 2015
• Authors: Zun Chao Liu, Ke Wang*, Xin Gu, Min Shan Liu
• Keywords: Heat Exchanger, H-Type Structure, Stress Intensity, Thermal Stress, Variable Cross-Section

References

[1] Guohong Feng, Yanzhi Cao, Hong Hao, The research progress of shell and tube heat exchanger, Technology & Development of Chemical Industry, 06 (2009) 41-45.

[2] Yongdong Chen, Xuedong Chen, Technology development of large-scale heat exchanger in China, Chinese Journal of Mechanical Engineering, 10 (2013) 134-143.

[3] Qiwu Dong, Minshan Liu, Lijian Su, Study of shell and tube heat exchanger, Process Equipment & Piping, 06(2006) 18-22.

[4] Guanghui Xu, The CAE analysis of H-type structure and secondary development in heat exchanger with longitudinal flow of the shell side fluid. Zhengzhou University, China, (2005).

[5] Jiazhen Pan, Pressure Vessel Materials Handbook - Carbon Steel and Alloy Steel, Chemical Industry Press, Beijing, 2000, pp.223-225.

[6] Minshan Liu, Ruijie Wang, Qiwu Dong and Tong Liu, Three-dimensional finite element analysis of temperature field and thermal stress analysis of tube sheet in U-tube SG model, in: S.T. Tu, Z.D. Wang, G.C. Sih (Eds. ), Structural Integrity in Nuclear Engineering, East China University of Science and Technology Press, Shanghai, 2011, pp.319-323.

[7] JB4732-1995, Steel Pressure Vessel – Design by Analysis, Standards Press of China, Beijing, (1995).