Author:
Rollinson Andrew N.,Williams Orla
Abstract
Samples of torrefied wood pellet produced by low-temperature microwave pyrolysis were tested through a series of experiments relevant to present and near future waste to energy conversion technologies. Operational performance was assessed using a modern small-scale downdraft gasifier. Owing to the pellet's shape and surface hardness, excellent flow characteristics were observed. The torrefied pellet had a high energy density, and although a beneficial property, this highlighted the present inflexibility of downdraft gasifiers in respect of feedstock tolerance due to the inability to contain very high temperatures inside the reactor during operation. Analyses indicated that the torrefaction process had not significantly altered inherent kinetic properties to a great extent; however, both activation energy and pre-exponential factor were slightly higher than virgin biomass from which the pellet was derived. Thermogravimetric analysis-derived reaction kinetics (CO
2
gasification), bomb calorimetry, proximate and ultimate analyses, and the Bond Work Index grindability test provided a more comprehensive characterization of the torrefied pellet's suitability as a fuel for gasification and also other combustion applications. It exhibited significant improvements in grindability energy demand and particle size control compared to other non-treated and thermally treated biomass pellets, along with a high calorific value, and excellent resistance to water.
Funder
Engineering and Physical Sciences Research Council
Reference69 articles.
1. McGovern RE. 2007 Report on trials of farm grain dryers for wood chip moisture reduction . SAC Consultancy Services Division report pp. 1–9. Craibstone Aberdeen.
2. OFGEM. 2012 Annual Sustainability Report Dataset [online]. See https://www.ofgem.gov.uk/publications-and-updates/annual-sustainability-report-2011-2012 (accessed 11 September 2015).
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