The Role of Inorganic Matter in Biomass Self-Ignition

L. Schwarzer, P. A. Jensen, P. Glarborg, J. K. Holm, K. Dam-Johansen

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

Solid biomass, such as wood pellets, can replace coal for heat and power generation in existing com-bined heat and power plants. This requires storing and processing such materials in large quantities, where they have shown a tendency to self-heat, and possibly spontaneously ignite. From a plant operator’s point of view, it is highly relevant to model and predict such behavior, ideally based on available fuel data. Inorganic matter present in biomass has been known to promote thermal conversion, both under oxidative and inert atmospheres. In this study, biomasses with different inorganic content and composition (pine, beech, wheat straw, sunflower husks) are screened in lab-scale fixed-bed heating experiments, and reaction rates for these materials are determined by thermogravimetric anal-ysis. No clear connection between ash-forming elements naturally present in the biomass materials on one side, and reaction onset behavior or reaction rates at 150–230 °C on the other was found. However, adding KCl to pine wood increased reaction rates compared to the raw sample. The results presented here suggest that catalytic effects play a role, but across different materials, the low-temperature behavior is (likely) dominated the composition in terms of cellulose, hemicellulose, lignin, and extractives. Further research is necessary to confirm these findings.
Keywords: solid biofuel, reactivity, combustion, ashes, lignocellulose, low temperature
Original languageEnglish
Title of host publicationProceedings of 26th European Biomass Conference and Exhibition
PublisherETA-Florence Renewable Energies
Publication date2018
Pages572 - 577
ISBN (Electronic)978-88-89407-18-9
DOIs
Publication statusPublished - 2018
Event26th European Biomass Conference and Exhibition (EUBCE 2018) - Bella Center, Copenhagen, Denmark
Duration: 14 May 201817 May 2018

Conference

Conference26th European Biomass Conference and Exhibition (EUBCE 2018)
LocationBella Center
CountryDenmark
CityCopenhagen
Period14/05/201817/05/2018

Keywords

  • Solid biofuel
  • Reactivity
  • Combustion
  • Ashes
  • Lignocellulose
  • Low temperature

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