Control of NOx and N2O in pressurized fluidized-bed combustion

Lu, Yunhu; Hippinen, Ilkka; Jahkola, A.

doi:10.1016/0016-2361(95)93462-m

Cited by 22 publications

(16 citation statements)

References 3 publications

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“…In this figure, NO x concentration decreases with higher IB‐STOR for both fuels. The results are consistent with those by Lu et al , . This is because staged combustion and FGR combustion are used in this study.…”

Section: Resultssupporting

confidence: 93%

“…When IB‐STOR increases from 80% to 100%, the bed zone combustion fraction increases to 41.75%. Thirty percent more corncob is burned in the bed zone, which increases its bed residence time and decreases the CO emission significantly …”

Section: Resultsmentioning

confidence: 99%

“…Thirty percent more corncob is burned in the bed zone, which increases its bed residence time and decreases the CO emission significantly. [18,19] There is fuel-rich combustion in the bed zone when IB-STORs is less than 100%, and the reduction reaction between NO and CO is more active under this condition. In this test, the total excess oxygen ratio of corncob combustion is 46%.…”

Section: Effect Of Bed Temperature On the Pollutant Emissionsmentioning

confidence: 99%

“…The results are consistent with those by Lu et al,. [19] This is because staged combustion and FGR combustion are used in this study. When these two combustion methods are used in VFBC, a low-oxygen zone is created in the bed zone.…”

Section: Effect Of Ib-stor On the Pollutant Emissionsmentioning

confidence: 99%

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Comparison of combustion behaviors and pollutant emissions using bituminous coal and corncob in a fluidized bed combustor

Duan

Chyang

Tso

2014

Asia-Pacific J Chem Eng

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The combustion behaviors and pollutant emissions of corncob and bituminous coal in a pilot scale vortexing fluidized bed combustor was compared. The flue gas recirculation combustion mode was used in this study. The effects of operating parameters, such as stoichiometric oxygen ratio, and bed temperature on the pollutant emissions were investigated. The results show that the combustion fractions vary with different kinds of fuels, resulting in different CO and NOx emission characteristics. Corncob combusts primarily in the freeboard zone, whereas bituminous coal combusts primarily in the bed zone. Therefore, the CO emission decreases with the increasing bed temperature in bituminous coal combustion, whereas the effect of bed temperature on CO emission is not obvious in corncob combustion. The CO emission of corncob combustion decreases with the stoichiometric oxygen ratio, whereas the CO emission of bituminous coal combustion has the inverse trend. For both fuels, the NOx emissions increase with the bed temperature but decrease with the stoichiometric oxygen ratio. © 2014 Curtin University of Technology and John Wiley & Sons, Ltd.

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Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 99%

Section: Effect Of Bed Temperature On the Pollutant Emissionsmentioning

confidence: 99%

Section: Effect Of Ib-stor On the Pollutant Emissionsmentioning

confidence: 99%

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Comparison of combustion behaviors and pollutant emissions using bituminous coal and corncob in a fluidized bed combustor

Duan

Chyang

Tso

2014

Asia-Pacific J Chem Eng

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“…Combustion zone outlet temperature is observed about 860°C, where the anode depleted fuel meet with cathode depleted gas (~16% O 2 ) and combust to generate heat. NH 3 at that temperature range can react to generate various products (etc., N 2 , NO, N 2 O) as discovered in various studies [36,37].…”

Section: Combustion Zonementioning

confidence: 99%

Ammonia as a Contaminant in the Performance of an Integrated SOFC Reformer System

Rao

Brouwer

et al. 2006

ASME 2006 Fourth International Conference on Fuel Cell Science, Engineering and Technology, Parts a and B

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As supply of natural gas (NG) is limited, more attention is being given to operating fuel cells on syngas derived from gasification of feedstocks such as coal and biomass. Ammonia (NH 3 ) is one of the problematic contaminants contained in syngas produced from these nitrogen containing feedstocks. NH 3 can be easily oxidized to nitric oxide (NO) in a combustion process and thus if present in the anode exhaust gas would be problematic.The potential effects of NH 3 (particularly at low levels) on fuel cell system performance have not been well studied. The former studies on NH 3 have been limited to either the reforming process alone or testing the fuel cell at the cell level with NH 3 containing gases. No studies have been accomplished on a fuel cell system level basis. Objectives of this work are to obtain a comprehensive understanding of fuel cell system performance on syngas containing NH 3 using an integrated SOFC reformer system. Detailed analysis is conducted within the three major reacting components -indirect internal reformer, SOFC stack and combustion zone. Various simulation tools (etc., CHEMKIN, ASPEN, APSAT) are utilized for analysis. Results show that NH 3 conversion (into N 2 and H 2 ) in the internal reformer is about 50% when temperature is 750°C. NH 3 conversion (into N 2 and H 2 ) in the SOFC stack can affect NO x emissions significantly. More than 50% NH 3 left from SOFC stack can convert into NO x in the combustion zone. Experimental study is also planned to validate the theoretical results.

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Modelling NOx emissions during staged combustion

Fan

Yuan

et al. 1999

Int. J. Energy Res.

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Control of NOx and N2O in pressurized fluidized-bed combustion

Cited by 22 publications

References 3 publications

Comparison of combustion behaviors and pollutant emissions using bituminous coal and corncob in a fluidized bed combustor

Comparison of combustion behaviors and pollutant emissions using bituminous coal and corncob in a fluidized bed combustor

Ammonia as a Contaminant in the Performance of an Integrated SOFC Reformer System

Modelling NOx emissions during staged combustion

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