Thermochemical conversion: direct combustion

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Abstract

This chapter describes some fundamental theory about combustion within a framework of practical applications. The purpose of the combustion process is to release the energy of the biomass. In order to understand the conversion process in a quantitative way, one could analyze one-dimensional systems like a propagating front. The chapter considers the combustion of the remaining (porous) solid particles that are composed of carbon, with mass fraction YC, and inert ashes that are not converted. The shrinking density model, in which reaction takes place inside the particle, resulting in a density decrease, is considered. The general theory of surface conversion is explained by first looking at simple evaporation of a droplet. Finally, the emissions from biomass combustion and measures to reduce them are discussed.

Original languageEnglish
Title of host publicationBiomass as a Sustainable Energy Source for the Future: Fundamentals of Conversion Processes
PublisherWiley-Blackwell
Pages268-297
Number of pages30
ISBN (Print)9781118916643, 9781118304914
DOIs
Publication statusPublished - 3 Nov 2014

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Keywords

  • Biomass combustion systems
  • Direct combustion
  • Particle conversion modes
  • Particle emissions
  • Shrinking density model
  • Thermochemical conversion

Cite this

Bastiaans, R. J. M., & van Oijen, J. A. (2014). Thermochemical conversion: direct combustion. In Biomass as a Sustainable Energy Source for the Future: Fundamentals of Conversion Processes (pp. 268-297). Wiley-Blackwell. https://doi.org/10.1002/9781118916643.ch9