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Improving Lifetime and Manufacturability of an RQL Combustor for Microturbines: Design and Numerical Validation

[+] Author Affiliations
Paolo Laranci, Gianni Bidini, Mauro Zampilli, Francesco Fantozzi

University of Perugia, Perugia, Italy

Bruno D’Alessandro

Bionet s.r.l Biomass & New Technoligies, Terni, TR, Italy

Fabio Forcella

Forcella Impianti, Pedrengo, Bergamo, Italy

Paper No. GT2015-43543, pp. V003T03A009; 12 pages
  • ASME Turbo Expo 2015: Turbine Technical Conference and Exposition
  • Volume 3: Coal, Biomass and Alternative Fuels; Cycle Innovations; Electric Power; Industrial and Cogeneration
  • Montreal, Quebec, Canada, June 15–19, 2015
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-5667-3
  • Copyright © 2015 by ASME


A new annular RQL combustion chamber of an 80 kWel Elliott TA80R micro gas turbine was designed and built with a modified geometry to overcome known failures at low running hours (around 2500 hrs) caused by overheating. Design considered simplified manufacturability and flow optimization to reduce emission while maintaining similar temperatures and efficiencies. A preliminary geometry was analyzed and also built to verify manufacturability and economics. It was easily built with overall brute costs around 3000 €. It has also run continuously for over 27.000 hrs.

An optimized geometry, however, guaranteed similar TIT with respect to the original geometry with a considerable reduction in CO and NOx emissions.

Given the installation of the mGT at the IRP (Integrated Pyrolysis Regenerated Plant) the modified geometry was tested through CFD analysis on syngas from biomass thermochemical processes. The results show that further modifications of the liner are required for optimal operation and to reach adequate values for Turbine Inlet Temperature.

Copyright © 2015 by ASME



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