A cfd-method for the analysis and optimization of the fixed bed conversion in biomass grate furnaces

Matthias Singer*, Ramin Mehrabian, Thomas Gruber, Andres Anca-Couce, Robert Scharler

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

To optimize the combustion of biomass grate furnaces a sensitivity analysis is carried out by means of CFD simulation. The methodical procedure consists of a 3D packed bed biomass combustion model, which describes the most essential characteristics of the thermal conversion of biomass particles, such as the detailed consideration of drying, pyrolysis and char oxidation in parallel processes. Within the sensitivity analysis the following parameters have been investigated: distribution of false air, residence time of fuel on the grate and distribution of recirculated flue gas and primary air below the grate. To evaluate the influence of the varied parameters on the combustion process the focus lied on the position of the thermal conversion of the biomass and the CO at the outlet of the simulation domain. The results of the sensitivity analysis show a shift of the thermal conversion towards the grate end for increased false air as well as for reduced momentum of primary air/recirculated flue gas mixture. An increase of the fuel residence time leads to a shift of the thermal conversion towards the fuel inlet. Consequently a large region of the primary combustion zone is not used due to earlier release of CO inside the fuel bed.

Original languageEnglish
Title of host publicationEuropean Biomass Conference and Exhibition Proceedings
Pages688-693
Number of pages6
Volume27
ISBN (Electronic)978-88-89407-19-6
DOIs
Publication statusPublished - 1 Jan 2019
Event27th European Biomass Conference and Exhibition: EUBCE 2019 - Lisbon, Portugal
Duration: 27 May 201930 May 2019
Conference number: ISSN 2282-5819
http://www.eubce.com/

Conference

Conference27th European Biomass Conference and Exhibition
Abbreviated titleEUBCE 2019
CountryPortugal
CityLisbon
Period27/05/1930/05/19
Internet address

Keywords

  • CFD optimization
  • Combustion
  • Efficiency
  • Grate furnace

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Forestry
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

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