Analysis of vibration amplitude as a function of excitation frequencies in an existing beam and shell heat exchanger

F. Malki, N. Abdelbaki, A. Hadjadj

Abstract


This work aims to contribute to understanding the parameters influencing the amplitude of vibrations in the variation of excitation frequencies in a core and shell heat exchanger. Vibrations produced by fluid-structure interaction are typical and originate in the functioning of systems, where they manifest a malfunction but can be a potential source of damage. Shell and tube bundle exchangers in the petroleum industry are constantly exposed to this kind of vibration problem due to Karman vortex force frequencies. For this case study, the natural frequencies of the vacuum tube of 36.993 Hz, or at the extreme operation of 36.927 Hz, can generate vibrations compared to the interaction fluid-elastic instability, which is very low in our case of 0.0608, under flow with a critical operating speed of 734.412 cm/sec.The good vibration program analyzed vibration amplitudes induced by variation of excitation frequencies under license available to the oil company SONATRACH in Arzew. To draw the amplitude profiles for a core and shell heat exchanger existing in this oil refinery, we have integrated into the program all the data specific to this exchanger, and we have imposed different excitation frequency values, with values lower and higher than those specific to the tube.The simulation results showed that the vibration amplitude is low when the excitation frequency values are lower than the natural tube frequency of the case studied; these low amplitudes cause cuts in the beams by the baffles. The amplitude greater than half the distance between the pipes leads to the collision problem. A good distribution of amplitudes and harmonic profile can be observed for frequencies greater than or double the natural frequency of the tube. These vibration amplitudes may be beneficial in creating flow turbulence, which directly influences the exchanger's performance in DTLM, thus reducing the impact of fouling and extending the life of the exchanger. For the frequencies studied, the value exceeding 120 Hz can have a dangerousness impact of 117.6%. We could that the Good Vibrations program, which is very effective in pronouncing  the influence of external and mechanical forces giving vortex frequencies in heat exchangers and analysis of their direct impact on the proper functioning of this essential device in the oil industry. Acoustic vibrations and sound frequencies are not considered in our work

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References


MOHR, U. Influence of geometry and velocity distribution on vibrational excitation of tube bundle heat exchangers, VDI progress reports serial 11, No. 304, Dusseldorf.; Berlin 2001.

Erskine, J.B.; Waddington, W. Review of some tube vibration failures in shell and tube heat exchangers and failure prediction methods, Proceedings of International Symposium on Vibration Problems in Industry, 1973.

Chenoweth, J.M. Flow-Induced vibrations in shell and tube heat exchangers, Workshop, June 27-28, Pasadena, California, 1976.

Chenoweth, J.M. Flow-induced vibration, heat exchanger design handbook, 1983.

Kim, S.; Alam, M.M.; Sakamoto, H. and Zhou, Y. Flow-induced vibrations of two circular cylinders in tandem arrangement, 2009.

Yan, K.; Ge, P.; Hong, J. Experimental study of shell side flow-induced vibration of conical spiral tube bundle, 2012.

Miwa, S.; Michitsugu, M.; Hibiki, T. Two-phase flow induced vibration in piping systems, 2014.

Chung, M.H. Transverse vortex-induced vibration of spring-supported circular cylinder translating near a plane wall, 2015.

Kim, S.; Alam, M.M. Characteristics and suppression of flow-induced vibrations of two side-by-side circular cylinders, 2012.

Jiang, N.; Xiong, F.; Zang, F.; Zhang, Y.; Qi, H. Analysis on vibration response of U-tube bundles caused by two-phase cross-flow turbulence, 2016.

Hartog, D. Mechanical Vibrations, 4th ed., McGraw-Hill, New York, 1956.

Khushnood, S.; Khan, Z.M.; MaliK, M.A.; Koreshi Z. and Khan, M.A. Cross-Flow-Induced-Vibrations in Heat Exchanger Tube Bundles, a review, University of Engineering and Technology, Pakistan, 2012.

MacDuff, J.N.; Felgar, R.P. Vibration Design Charts, Trans. ASME, vol. 79, 1957.

Gorman, D.J. Free Vibration Analysis of Beams and Shafts, p. 168-175, Wiley-Inter science, New York, 1975.

Kissel, J.H. Flow Induced Vibrations in Heat Exchangers, 1972.

Price, S.J. A review of theoretical models for fluid-elastic instability of cylinder arrays in cross-flow. Journal of Fluids and Structures, 9, 463–518, 1995.

Williams, E.; Gerber, A.; Hassan, M. Simulation of Cross Flow Induced Vibration, 2004.

Khushnood, S.; Khan, Z.M.; Koreshi, Z.U.; Rashid H.U. Dimensional analysis of vibration of tube bundle in cross-flow, 2000.

Connors, H.J.; Fluid-elastic Vibration of Heat Exchanger Tube Arrays, J. Mech. Design, vol. 100, 1978.

Khushnood, S.; Khan, Z.M.; MaliK, M.A.; Koreshi, Z.U.; Khan, M.A. Cross-Flow-Induced-Vibrations in Heat Exchanger Tube Bundles, a review, University of Engineering and Technology, Pakistan, 2012.

Axisa, F. Modeling of mechanical systems, volume 4, Vibrations under flow, 2001.

MOHR, U.; GELBE, H. Velocity Distribution and vibrations Excitation in Tube Bundle Heat Exchangers, Intern. Journal of Thermal Sciences Vol.39, pp.414-421, 2000

Chen, S.S. Flow-induced Vibration of Circular Cylindrical Structures, Hemisphere Publishing Corporation, Washington, I987.

Pettigrew, M.J.; Carlucci, L.N.; Taylor, C.E.; Fisher, N.J. Flow-induced vibration and related technologies in nuclear components, Nuclear Engineering and Design, 1991.

Weaver, D.S.; Fitzpatrick, J.A. A review of flow-induced vibration in heat-exchangers, UK, I987.

Chen, Y.N. Turbulence as excitation source in staggered tube bundle heat exchangers, American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP, 41, 45–63, 1980.

Gelbe, H.; Jahr, M.; Schroder, K. Flow-induced vibrations in heat exchanger tube bundles, 1995.

Païdoussis, M.P. Review of flow-induced vibrations in reactors and reactor components, Nuclear Engineering and Design, 1982.

Pettigrew, M.J.; Taylor, C.E. Vibration analysis of shell-and-tube heat exchangers, Journal of Fluids and Structures, 2003.

Pettigrew, M.J.; Gorman, D.J. Vibration of heat exchange components in liquid and two-phase cross-flow. Atomic Energy of Canada Limited, AECL (Report), 1978.

Nakamura, T.; Fujita, K.; Shiraki, K.; Kanasawa, H.; Sakata, K. An experimental study on exciting force by two-phase cross-flow. Flow induced Vibration of Circular Cylindrical Structures, 63, 1982.

Pettigrew, M.J.; Taylor, C.E. Two-phase flow-induced vibration, An overview, Journal of Pressure Vessel Technology, Transactions of the ASME, 116, 233–253, 1994.

Pettigrew, M.J.; Taylor, C.E.; Kim, B.S. The effects of bundle geometry on heat exchanger tube vibration in two-phase cross flow. Transactions of the ASME, 2001.

Pettigrew, M.J.; Taylor, C.E.; Janzen, V.P.; Whan, T. Vibration behavior of rotated triangular tube bundles in two-phase cross flows, Journal of Pressure Vessel Technology, Transactions of the ASME, 124, 144–153. Pressure Vessel Technology, 123, 414–20, 2002.

Taylor, C.E. ; Pettigrew, M.J.; Currie, I.G. Random excitation forces in tube bundles subjected to two-phase cross-flow, ASME Journal of Pressure Vessel Technology- Transactions of the Asme, 118(3), 265 -277, 1996.

Pettigrew, M.J.; Taylor, C.E. Vibration analysis of shell-and-tube heat exchangers, an overview - Part 1: flow, damping, fluidlastic instability, Journal of Fluids and Structures, 18(5), 469-483, 2003.

GELBE, H.; SCHRDER, K.; ZIADA, S. Vibrations in heat exchanger tube bundles, VDI -Heat Atlas, Chap. Oc, 10th edition, Springer – Verlag, Berlin (or 9th edition 2002).

SCHRDER, K.; GELBE, H. New Design Recommendations for Elastic Fluid Instability in Heat Exchanger Tube Bundles, Journal of Fluid and Structures 13, 3 , p. 355-381, 1999.


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