Effect of bed material density on the performance of steam gasification of biomass in bubbling fluidized beds

Antonio Soria-Verdugo*, Lukas Von Berg, Daniel Serrano, Christoph Hochenauer, Robert Scharler, Andrés Anca-Couce

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

Steam gasification of lignocellulosic biomass in a bubbling fluidized bed reactor was analyzed by means of the composition of the producer gas, including tars, and temperature distribution in the reactor. The catalytic and sorbent effect of sepiolite particles was studied by comparison of the tars generated with those produced in a bed of olivine, widely used in biomass gasification applications. Sepiolite has a lower particle density, which influences the forces acting on fuel and char particles and leads to a more homogeneous distribution of them in the dense bed during the gasification process. Fluidized beds of sepiolite particles contribute to increase the heating value of the producer gas and its hydrogen content compared to gasification under the same operating conditions in olivine beds. Furthermore, the tar yield is around 25% lower when gasifying in sepiolite beds, reducing the requirement of secondary methods for tars removal. Long-term gasification tests were also conducted in a sepiolite bed to evaluate the mitigation of the sorbent/catalytic effect of sepiolite with time.

Original languageEnglish
Article number116118
JournalFuel
Volume257
DOIs
Publication statusPublished - 1 Dec 2019

Keywords

  • Biomass steam gasification
  • Fluidized bed
  • Olivine
  • Sepiolite
  • Tars

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Organic Chemistry

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