Deep-staged, oxygen enriched combustion of coal

Daood, Syed Sheraz; Nimmo, W.; Edge, P.; Gibbs, B.M.

doi:10.1016/j.fuel.2011.02.007

Cited by 39 publications

(25 citation statements)

References 12 publications

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“…These results are also in good agreement with these published by Daood et al [175]. Considering the results described by both authors it was postulated for the further study, that must mainly depend on the excess air level within the burner zone and further that this relationship would follow the specific function shape based on the results published by Schlessing [174], see Figure 16 (solid line).…”

Section: Figure 15 Foster Wheeler Parallel Flow Split Flame (Vs / Sfsupporting

confidence: 91%

Predictions of NOx emissions in pulverized coal combustion.

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Section: Figure 15 Foster Wheeler Parallel Flow Split Flame (Vs / Sfsupporting

confidence: 91%

Predictions of NOx emissions in pulverized coal combustion.

Hachenberg

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“…OEC tests performed on the same test facility has proven to produce better carbon burnouts published elsewhere [10][11]. The application of SNCR NO control has been shown to be applicable to O 2 enriched combustion of RC2 and RC2-SM and RC2-CS (Fig.…”

Section: Impact Of Sncr On No Reduction In Oec Conditionsmentioning

confidence: 94%

“…A number of comprehensive reviews and research articles have already been published signifying the developments and findings related to co-combustion, oxy-fuel and SNCR application, for control of combustion generated nitrogen oxides (NO x ) [6][7][8][9].The effect of oxygen enrichment for NO x emission from coal and coal-biomass combustion under deeply staged configurations has already been discussed in detail [10][11]. This study extends these concepts for exploitation under SNCR conditions in a 20 kW combustion test facility of University of Leeds (UK).…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, it is believed that if the biomass-coal co-fired power generation units are equipped with retrofit able oxygen enhanced combustion (OEC) and SNCR processes, the results can easily far outweigh the benefits of SCR with better carbon burnouts, plant efficiencies and emission levels [10][11][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

“…It was found that below 1000 o C, higher NO reduction was reported for higher O 2 concentration due to formation of more radicals to drive the sustained chain reactions by increasing the rate of H + O 2  OH + O and O + H 2 O  OH + OH reactions [14]. However, there is a need to do more investigations especially on the effect of O 2 enrichment on the performance of SNCR process for coal-biomass co-fired pulverised combustors due to limited available published literature on such hybrid configurations.Moreover, it is believed that if the biomass-coal co-fired power generation units are equipped with retrofit able oxygen enhanced combustion (OEC) and SNCR processes, the results can easily far outweigh the benefits of SCR with better carbon burnouts, plant efficiencies and emission levels [10][11][15][16][17][18][19][20]. …”

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confidence: 99%

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NOx control in coal combustion by combining biomass co-firing, oxygen enrichment and SNCR

Daood

Javed

Gibbs

et al. 2013

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Article: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 https://doi.org/10.1016/j.fuel.2012.06.087 eprints@whiterose.ac.uk https://eprints.whiterose.ac.uk/ Reuse Unless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request. Abstract:There has been renewed interest in evaluating the effect of biomass co-firing on the multi-pollutant control system such as Selective Non-catalytic Reduction (SNCR) and oxygen enrichment. Emissions savings have been attained by combining SNCR and biomasscoal co-combustion under various oxygen enriched staged air levels. Biomasses with higher tendency of generating CO produced better reduction 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 O 2 concentration for unstaged combustion.Whereas, a range of 40%-80% NO reductions were attained for RC2 (a Russian Coal) and 15% co-fired biomasses with 3.1%-5.5 % overall O 2 concentration at 22%-31% levels of flame staging. Moreover, it was found that better NO x removal efficiency was attained for higher NO x emission baselines under both oxygen enriched and normal firing conditions. However, SNCR NO x control for both coal or coal-biomass blends was observed to produce higher NO x reductions during O 2 enrichment, believed to be due to the self-sustained NO x reduction reactions. Hence, NO x control by SNCR, oxygen enriched co-firing in the furnaces would result in lower NO x emissions and higher carbon dioxide concentration for efficient scrubbing with better carbon burnouts.Key words: NOx, SNCR, biomass cofiring, coal 1.IntroductionSome conventional coal fired power stations of Europe are under threat of closure, due to enforcement in 2020 (previously 2016), of the Large Combustion Plant Directive (LCPD)[1]. This is due to the economics of implementing control technologies to reduce the emission of NO x to lower than 200mg/Nm 3 . Moreover, UK is also expected to fail in meeting the NO x emissions ceiling target set by the European National Emissions Ceiling Directive (ENECD)[2]. Hence, the ENECD is reviewing to produce new emission cei...

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