Gardner Brown Ltd

Cheltenham, United Kingdom

Gardner Brown Ltd

Cheltenham, United Kingdom
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Craven J.M.,University of Sheffield | Swithenbank J.,University of Sheffield | Sharifi V.N.,University of Sheffield | Peralta-Solorio D.,Soar Technology, Inc. | And 2 more authors.
Biomass and Bioenergy | Year: 2015

One of the key factors affecting the economic viability and safe deployment of wood pellet fired systems on a large scale is wood pellet stability. Wood pellets are extremely moisture unstable and present significant problems during the transportation, storage and handling stages of their lifetime. This study proposes an approach for creating moisture stable wood pellets through the addition of hydrophobic coatings. Pellets were treated with paraffin oil, castor oil, mineral oil and linseed oil and submerged in water for up to 1800s. The strength of untreated pellets was found to decrease by around 94% after being submerged for 60s, whereas no appreciable reduction in pellet strength was recorded after 1800s in all of the oil treated cases. Treatment with oil was also found to reduce the formation of airborne fines and increase the energy density of wood pellets, increasing their HHV by up to 1.2MJkg-1. © 2015 The Authors.


Craven J.M.,University of Sheffield | Swithenbank J.,University of Sheffield | Sharifi V.N.,University of Sheffield | Peralta-Solorio D.,Soar Technology, Inc. | And 3 more authors.
Fuel Processing Technology | Year: 2014

The Hydraulic Lock Hopper (HLH) embodies a high pressure dry feed system that uses water as an incompressible fluid to bring about compression. No pressurising gas is required, so commonly used inert gases such as nitrogen and carbon dioxide are conserved. The HLH has successfully demonstrated the feeding of solid fuels such as wood pellets to pressures as high as 25 barg in two modes of operation. Energy requirements of 15.51 kJ/kg (Mode 1) and 20.61 kJ/kg (Mode 2) have been recorded which translate to significant energy savings of 81.9% and 75.9% compared to conventional lock hoppers. Energy savings have been projected to increase for Mode 2 where lock gas contamination with syngas takes place, and the mass flow rate has been shown to operate independently of pressure varying between 2 and 2.5 tonnes/day. The HLH has also been shown to have a negligible effect on the fuel moisture content with moisture content increases being recorded to be consistently less than 1 wt.%. © 2013 Elsevier B.V.

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