Gas turbine exhaust duct failures

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Risk mitigation: Investigation and analysis of gas turbine exhaust ducts.

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Gas turbine exhaust duct failures

  1. 1. Lloyd’s Register services to the energy industryLloyd’s Register ODSGas turbine exhaust duct failuresJohan Gullman-Strand, Ph.D.Senior consultantLloyd’s Register ODS
  2. 2. Lloyd’s Register services to the energy industryGas turbine exhaust ducts Immediate problems • Damage on duct walls, cracks, missing insulation, • WHRU* failure, exhaust gas leaks , silencer degradation • Emergency shutdown, loss of production * Waste Heat Recovery Unit
  3. 3. Lloyd’s Register services to the energy industryThe main problems •Structural integrity compromised by pressure fluctuations in the highly separated flow •Start-up and shutdown causing excessive thermal stresses.
  4. 4. Lloyd’s Regis ter s ervic es to the energy indus tryLloyd’s Register ODSservices and solutions •Failure investigation •Coupled analysis of complete system (FSI) •Fluid Dynamics (CFD) •Structural analysis (FEA) •Analytical evaluation of old and new designs •Verification by on-site measurements •Pressure, vibration, temperature, strain
  5. 5. Lloyd’s Register services to the energy industryPressure, vibration, temperature, strain
  6. 6. Lloyd’s Register services to the energy industryFSI Response
  7. 7. Lloyd’s Register services to the energy industry Summary Typical solutions:• Benefits: Guide vane design• Capture complex interactions. Valve re-design• Better understanding of failure mechanics. Flange improvement• Provide knowledge and tools for re-design. Duct insulation changes• The ODS advantage:• Extensive experience• Combination of analyses and measurements• Computational resources for coupled analyses.• Experts in each field
  8. 8. Lloyd’s Register services to the energy industryTurbulence Immediate problems • Damagage on duct walls, cracks, missing insulation, • WHRU* failure, exhaust gas leaks , silencer degradation • Emergency shutdown, loss of production
  9. 9. For more information, please contact:Johan Gullman-Strand M.Sc, Ph.d.Senior Consultant, Lloyd’s Register ODSLloyd’s Register group entity71 Fenchurch StreetLondon, EC3M 4BST +46 733 298 330E johan.gullman-strand@lr-ods.comw www.lr-ods.comServices are provided by members of the Lloyds Register Group.For further information visit www.lr.org/entities

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