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Description: Biomass is a carbon neutral renewable fuel that could partially substitute coal in coal fired power plants for reduction in GHG emission. However, some shortcomings such as heterogeneity, hygroscopic behavior, fibrous nature, low energy density, and low bulk density, makes it significantly difficult to replace major fraction of coal with biomass. These shortcomings also create difficulties in storage, transportation, and processing of biomass and lessen the economic viability. Torrefaction, a thermo-chemical pretreatment process that greatly reduces above shortcomings making it possible to significantly raise the fraction of coal replaced. Several types of technologies for torrefying biomass like rotating drum type, moving bed, fluidized bed, microwave, and pressurized reactors are in developing process. One of the major issues of the current torrefaction technologies is maintaining an inert environment for the process. This study presents presents a novel two-stage indirectly heated inclined continuous rotary torrefier (TIR) for improved torrefaction. Experimental results of torrefaction of Poplar in (TIR) under volatile gas medium is presented. The torrefaction was conducted at different angular speeds, inclinations, and temperatures, and the torrefied solid product is characterized by its physical and chemical compositions. Carbon content in torrefied Poplar is increased to double that in raw sample. Volumetric energy density is increased by 9% compared that to the raw biomass. The energy balance of the TIR showed the net system efficiency to be above 88%. Results also showed that torrefaction in TIR under volatile medium could avoid a nitrogen supply and its cost.

Keywords: Biomass Energy, Rotary Reactor, Two-stage Torrefaction, Solid Products Characterization
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Citation: . 2016. Torrefaction of Biomass in Two-Stage Indirectly Heated Rotary Torrefier. CSBE/SCGAB 2016 Annual Conference, Halifax, 3-6 July 2016.
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Pages -
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Date: juil-16
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Conference name: CSBE/SCGAB 2016 Annual Conference, Halifax, 3-6 July 2016.
Session name: Session 3A: Bioenergy Conversion Technologies I

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Type: Text.Article
Format: PDF
Publication type: Conference Proceeding
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Coverage: Canada
Language 1: en
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Rights: Canadian Society for Bioengineering
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