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Monitoring and vibration control of a fluid catalytic cracking unit

  • Battista, Ronaldo C. (COPPE Engineering Institute, Universidade Federal do Rio de Janeiro, Controllato Ltd.) ;
  • Varela, Wendell D. (COPPE Engineering Institute, Universidade Federal do Rio de Janeiro) ;
  • Gonzaga, Igor Braz N. (COPPE Engineering Institute, Universidade Federal do Rio de Janeiro)
  • Received : 2021.08.18
  • Accepted : 2021.11.23
  • Published : 2022.04.25
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Abstract

Oil refineries' Fluid Catalytic Cracking Units (FCCU) when in full operation may exhibit strong fluid dynamics caused by turbulent flow in the piping system that may induce vibrations in other mechanical and structural components of the Unity. This paper reports on the experimental-theoretical-computational program performed to get the vibration properties and the dynamic response amplitudes to find out alternative solutions to attenuate the excessive vibrations that were causing fatigue fractures in components of the bottle like reactor-regenerator of an FCC unit in operation in an existing oil refinery in Brazil. Solutions to the vibration problem were sought with the aid of a 3D finite element model calibrated with the results obtained from experimental measurements. A short description of the found solutions is given and their effectiveness are shown by means of numerical results. The solutions were guided by the concepts of structural stiffening and dynamic control performed by a nonlinear pendulum controller whose mechanical design was based on parameters determined by means of a parametric study carried out with 2D and 3D mathematical models of the coupled pendulum-structure system. The effectiveness of the proposed solutions is evaluated in terms of the fatigue life of critical welded connections.

Keywords

Acknowledgement

The authors acknowledge Brazilian National research Council - CNPQ and Petrobras BR for the financial support.

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