Journal
ENERGY CONVERSION AND MANAGEMENT
Volume 174, Issue -, Pages 276-287Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.enconman.2018.08.035
Keywords
Slot-rectangular spouted bed reactor; Torrefaction; Oxygen concentration; Reactor performance; Sawdust; Product properties
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Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Major project in Hunan Province [2016NK1001]
- Science and Technology Planning Project of Changsha [kq1606025, kh1701110, kq1707007]
- Technical Innovation Project (key grant) of Hubei Province [2016ACA176]
- Hubei Polytechnic University [2016102]
- China Scholarship Council (CSC)
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A slot-rectangular spouted bed (SRSB) reactor was employed to torrefy spruce-pine-fir sawdust in an oxidative atmosphere. The effects of torrefaction temperature (240-300 degrees C) and feed-gas oxygen concentration (3-9 vol.%) on torrefaction performance and solid product properties were investigated. Adding oxygen in the feed-gas led to more uniform temperature distributions in the SRSB reactor, and was a promising way to achieve stable continuous operation. The mass fraction of cyclone-caught torrefied biomass increased, whereas the mass fraction of torrefied biomass remaining in the reactor decreased, with increasing oxygen concentration and temperature. In oxidative torrefaction, biomass weight loss was 15.4-46.4%, while energy yield was 61.2-99.4%. The effects of oxygen concentration on the weight loss, energy yield and torrefied biomass properties were more significant at 300 degrees C than at 240 degrees C. The torrefied sawdust also had greater HHV and contained less volatiles, more carbon, less oxygen and less hydrogen than the raw biomass.
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