Daood, S.S., Javed, M.T., Gibbs, B.M. et al. (1 more author) (2013) NOx control in coal combustion by combining biomass co-firing, oxygen enrichment and SNCR. Fuel, 105. 283 - 292. ISSN 0016-2361
Abstract
There has been renewed interest in evaluating NOx emission control by selective non-catalytic reduction (SNCR) combined with biomass co-firing to meet impending enforcement of NOx emission limits for power generation plant. Oxygen enrichment for the concentration of CO 2 in the flue gas has been observed in this work to have benefits for NOx emission control. This paper presents new information on the effect of combining biomass co-firing with SNCR under various oxygen enriched and air-staging conditions performed in the 20 kW combustion facility. Biomass has a higher tendency to generate CO and produced better reductions in NO x emission with and without using SNCR. NO reduction of around 80% were attained using SNCR for 15% and 50% blending ratios of biomasses at 21% overall O2 concentration for unstaged combustion. Whereas, a range of 40-80% NO reductions were attained for coal (Russian Coal) and 15% co-fired biomasses with 3.1-5.5% overall O2 concentration at 22-31% levels of flame staging. Moreover, it was found that better NOx removal efficiency was attained for higher NOx emission baselines under both oxygen enriched and normal firing conditions. However, SNCR NOx control for both coal or coal-biomass blends was observed to produce higher NOx reductions during O2 enrichment, believed to be due to the self-sustained NOx reduction reactions. Hence, NOx control by SNCR, oxygen enriched co-firing in power station boilers would result in lower NOx emissions and higher CO2 concentration for efficient scrubbing with better carbon burnouts. © 2012 Elsevier Ltd. All rights reserved.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2014 Elsevier. This is an author produced version of a paper subsequently published in Fuel. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Biomass cofiring; Coal; NOx; SNCR |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Mechanical Engineering (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 12 Feb 2015 10:35 |
Last Modified: | 21 Apr 2015 23:56 |
Published Version: | http://dx.doi.org/10.1016/j.fuel.2012.06.087 |
Status: | Published |
Publisher: | Elsevier |
Refereed: | No |
Identification Number: | 10.1016/j.fuel.2012.06.087 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:83388 |