Modelling solid-convective flash pyrolysis of straw and wood in the Pyrolysis Centrifuge Reactor

Niels Bech, Morten Boberg Larsen, Peter Arendt Jensen, Kim Dam-Johansen

Research output: Contribution to journalJournal articleResearchpeer-review


Less than a handful of solid-convective pyrolysis reactors for the production of liquid fuel from biomass have been presented and for only a single reactor a detailed mathematical model has been presented. In this article we present a predictive mathematical model of the pyrolysis process in the Pyrolysis Centrifuge Reactor, a novel solid-convective flash pyrolysis reactor. The model relies on the original concept for ablative pyrolysis of particles being pyrolysed through the formation of an intermediate liquid compound which is further degraded to form liquid organics, char, and gas. To describe the kinetics of the pyrolysis reactions the Broido-Shafizadeh scheme is employed with cellulose parameters for wood and modified parameters for straw to include the catalytic effect of its alkali-containing ash content. The model describes the presented experimental results adequately for engineering purposes for both wood and straw feedstock even though conditions for ablative pyrolysis from a reaction engineering point of view are not satisfied. Accordingly, even though the concept of an ablatively melting particle may constitute a limiting case, it can still be used to model flash pyrolysis provided that the reacting particle continuously shed the formed char layer.
Original languageEnglish
JournalBiomass & Bioenergy
Issue number6-7
Pages (from-to)999-1011
Publication statusPublished - 2009


  • Pyrolysis centrifuge reactor
  • Ablative
  • Solid convective
  • Flash pyrolysis
  • Biocrude
  • Bio-oil
  • Wheat straw
  • Pine wood
  • Modelling


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