INFLUENCE OF FURNACE TUBE SHAPE ON THERMAL STRAIN OF FIRE-TUBE BOILERS

Abstract

The aim of this paper is to use numerical analysis and fine element method-FEM to investigate the influence of furnace tube shape on the thermal strain of fire-tube boilers. Thermal stresses in corrugated furnace tubes of different shape, i.e. with different corrugation pitch and depth, were analysed first. It was demonstrated that the thermal stresses in corrugated furnace tube are significantly reduced with the increase of corrugation depth. Than deformations and stresses in the structure of a fire-tube boiler were analysed in a real operating condition, for the cases of installed plain furnace tube and corrugated furnace tubes with different shapes. It was concluded that in this fire-tube boiler, which is of larger steam capacity, the corrugated furnace tube must be installed, as well as that the maximal stress in the construction is reduced by the installation of the furnace tube with greater corrugation depth. The analysis of stresses due to pressure and thermal loads pointed out that thermal stresses are not lower-order stresses in comparison to stresses due to pressure loads, so they must be taken into consideration for boiler strength analysis.

Keywords

Dates

  • Submission Date2013-03-17
  • Revision Date2013-05-29
  • Acceptance Date2013-09-14
  • Online Date2014-07-06

DOI Reference

10.2298/TSCI130317172G

References

  1. *** SRPS EN 12953-3:2010, Shell boilers-Part 3: Design and Calculation for Pressure Parts
  2. Ga.e.a, B., Milo.evi.-Miti., V., Maneski, T., Kozak, D. and Serti., J., Numerical and Experimental Strength Analysis of Fire-tube Boiler Construction, Technical Gazette, 18(2011), 1, pp. 237-242
  3. .uki., R., Maneski, T., Thermomechanical Stress Analysis of the Hot-water Boiler by FEM, Proceeding, 3rd International Congress of Thermal Stress, Cracow, Poland, 1999, pp. 325-328
  4. Ga.e.a, B., Thermomechanical analysis of behaviour and improvement of steam block boiler with three flue gas flow producing smaller steam, Procesna Tehnika, 18(2002), 1, pp. 111-114
  5. Ga.e.a, B,Influence of steam boiler geometry on construction strength, Proceedings, KGH 2001- 32nd International Congres on Heating, Refrigerating and Air-conditioning (Ed. B.Todorovi.), Belgrade, Serbia, 2001, pp. 128-134
  6. .ivkovi., D., Mil.i., D., Bani., M. and Milosavljevi., P., Thermomechanical Finite Element Analysis of Hot Water Boiler Structure, Thermal Science, 16 (2012), Suppl.2, pp. S387-S398
  7. Liu, M., Dong, Q., Gu, X., Stress analysis of Ħ-tubesheet in waste heat boiler, Journal of Pressure Equipment and Systems, 4(2006), 1-2, pp. 48-51.
  8. Qian, C.F., Yu, H.J., Yao, L.,Finite Element Analysis and Experimental Investigation of Tubesheet Structure,Journal of Pressure Vessel Technology, 131(2009), 1, pp. 111-114
  9. Ga.e.a, B., Numerical and experimental strength analysis of boiler constructions (in Serbian), Ph. D. Thesis, Faculty of Mechanical Engineering, University of Belgrade, Serbia, 2011
  10. Choubey, A., Sehgal, D.K., Tandon, N., Finite Element Analysis of Vessels to Study Changes in Natural Frequencies Due to Craks, Internacional Journal of Pressure Vessels and Piping, 83(2006), 3, pp. 181-187
  11. Younan, M.,Metwalli, S., Ei-Zoghby, A., Fracture Mechanics Analysis of a Fire Tube Boiler, Engineering Fracture Mechanics, 17(1983), 4, pp.335-348
  12. Ga.e.a, B., Maneski, T., Milo.evi.-Miti., V., Condition and Behavior Diagnostics of Boiler Constructions, FME Transactions, 40 (2012), 2, pp. 87-92
  13. Maneski, T., Computer modeling and calculation of structures, Faculty of Mechanical Engineering, Belgrade, Serbia, 1998
  14. Maneski, T., Milo.evi.-Miti., V., Numerical and experimental diagnostics of structural strength, Structural Integrity and Life, 10 (2010), 1, pp. 3-10
  15. ***SRPSEN 10028-2:2010, Flat Products Made of Steal for Pressure Purpose-Part 2: Non-alloy and Alloy Steal with Specified Elevated Temperature Properties
  16. ***SRPS EN 10216-2:2011, Seamless steel tubes for pressure purposes-Technical delivery conditions -Part 2: Non-alloy and alloy steel tubes with specified elevated temperature properties
Volume 18, Issue 11, Pages39 -47