Combustion of single biomass particles in air and in oxy-fuel conditions

Juan Riaza, Reza Khatami, Yiannis A. Levendis*, Lucía Álvarez, María V. Gil, Covadonga Pevida, Fernando Rubiera, José J. Pis

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

The combustion behaviors of four different pulverized biomasses were evaluated in the laboratory. Single particles of sugarcane bagasse, pine sawdust, torrefied pine sawdust and olive residue were burned in a drop-tube furnace, set at 1400K, in both air and O2/CO2 atmospheres containing 21, 30, 35, and 50% oxygen mole fractions. High-speed and high-resolution images of single particles were recorded cinematographically and temperature-time histories were obtained pyrometrically. Combustion of these particles took place in two phases. Initially, volatiles evolved and burned in spherical envelope flames of low-luminosity; then, upon extinction of these flames, char residues ignited and burned in brief periods of time. This behavior was shared by all four biomasses of this study, and only small differences among them were evident based on their origin, type and pre-treatment. Volatile flames of biomass particles were much less sooty than those of previously burned coal particles of analogous size and char combustion durations were briefer. Replacing the background N2 gas with CO2, i.e., changing from air to an oxy-fuel atmosphere, at 21% O2 impaired the intensity of combustion; reduced the combustion temperatures and lengthened the burnout times of the biomass particles. Increasing the oxygen mole fraction in CO2 to 28-35% restored the combustion intensity of the single biomass particles to that in air.

Original languageEnglish
Pages (from-to)162-174
Number of pages13
JournalBiomass & Bioenergy
Volume64
DOIs
Publication statusPublished - 1 Jan 2014

Keywords / Materials (for Non-textual outputs)

  • Biomass process residues
  • Combustion
  • Ignition
  • Pyrometry
  • Single particle
  • Torrefied biomass

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