Nimmo, W., Singh, S., Gibbs, B.M. et al. (1 more author) (2008) The evaluation of waste tyre pulverised fuel for NOx reduction by reburning. Fuel, 87 (13 - 1). pp. 2893-2900. ISSN 0016-2361
Abstract
The combustion of coal for power generation will continue to play a major role in the future, however, this must be achieved using cleaner technologies than we use at present. Scrap tyre arisings in the UK are 400,000 tonnes per year amounting to 30 million tyres and in the EU as a whole, more than 2.5 million tonnes of tyres per year are scrapped. The recent EC Waste Landfill Directive (1999) sets a deadline for the banning of whole and shredded tyres from landfill sites by 2006. Consequently, there is an urgent need to find a mass disposal route for tyres. We describe, in this paper, a novel use for tyre rubber pulverised fuel in a NOx reburning process which may have an application in power station boilers. This method of disposal could represent a way of combining waste disposal, energy recovery and pollution control within one process. A preliminary study of micronised tyre combustion was undertaken to identify the suitable size ranges for application in NOx reduction by reburning. Tests were performed in a down-fired, pulverised fuel combustor (PFC) operating at about 80 kW. Superior combustion characteristics, i.e. burnout were achieved with particle sizes less than 250 μm. A South African coal was used as the primary fuel in the reburn tests and the tyre was fed pneumatically via a separate feed system. Parameters studied, were, reburn zone stoichiometry and reburn fuel fraction. Additionally, the carbon content of the ash was carefully monitored for any effect on burnout at the fuel rich reburn stoichiometries. The NOx reductions achieved with tyres are compared with reburning with coal. NOx reductions up to 80% were achieved with tyres at half of the reburn fuel feed rate required to achieve the same reductions by coal. The results have been evaluated within the context of other studies available in the literature on NOx reburning by bituminous coal, brown coal, gas and biomass.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2008 Elsevier B.V. This is an author produced version of a paper published in Fuel. Uploaded in accordance with the publisher's self archiving policy. |
Keywords: | NOx, Reburn, Tyres, review |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) > Energy Research Institute (Leeds) |
Depositing User: | Sherpa Assistant |
Date Deposited: | 28 Aug 2008 11:14 |
Last Modified: | 16 Sep 2016 13:36 |
Published Version: | http://dx.doi.org/10.1016/j.fuel.2008.03.023 |
Status: | Published |
Publisher: | Elsevier B.V |
Refereed: | Yes |
Identification Number: | 10.1016/j.fuel.2008.03.023 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:4469 |