Biomass fired hot air gas turbine with fluidized bed combustion

G. Gallmetzer, M. Gaderer, F. Volz, F. Scheffler, H. Spliethoff, M. Gaderer, H. Spliethoff

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

The prevailing demand for decentralized energy supply out of renewable energy sources, such as biomass, requires small scale Combined Heat and Power (CHP) technologies. Current developments at the TU Munich comprise the Biomass fired Hot Air Gas Turbine (BioHGT), a fluidized bed wood combustor with integrated high temperature heat exchanger for indirect firing of microturbines at 100 kWel. The present work comprises a cycle proposal, allowing electrical efficiencies in the range of 30%. Simulation results showed, that enhanced heat exchanger tubes with structured tube walls allow higher heat flux without an increase in pumping power up to a PEC ratio of 3.5 compared with smooth tubes. The heat flux density within the fluidized bed was found to be a function of tube spacing and type of structure. Experiments showed shading of heat transfer area on axially knurled tubes. Literature data on the influence of the horizontal pitch could be confirmed. A novel ceramic corrosion protection layer was tested in a fluidized bed combustor for coating of freeboard air preheater tubes with no signs of damage in short period tests.

Original languageEnglish
Title of host publicationCFB 2008 - Proceedings of the 9th Int. Conference on Circulating Fluidized Beds, in Conjunction with the 4th International VGB Workshop "Operating Experience with Fluidized Bed Firing Systems"
PublisherTuTech Innovation GmbH
ISBN (Print)9783930400577
StatePublished - 2008
Event9th International Conference on Circulating Fluidized Beds, CFB 2008, in Conjunction with the 4th International VGB Workshop on Operating Experience with Fluidized Bed Firing Systems - Hamburg, Germany
Duration: 13 May 200816 May 2008

Publication series

NameCFB 2008 - Proceedings of the 9th Int. Conference on Circulating Fluidized Beds, in Conjunction with the 4th International VGB Workshop "Operating Experience with Fluidized Bed Firing Systems"

Conference

Conference9th International Conference on Circulating Fluidized Beds, CFB 2008, in Conjunction with the 4th International VGB Workshop on Operating Experience with Fluidized Bed Firing Systems
Country/TerritoryGermany
CityHamburg
Period13/05/0816/05/08

Keywords

  • Biomass CHP
  • Hot air gas turbine
  • Immersed heat exchanger
  • Microturbine
  • Structured tube surface

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