Experimental investigation of NO  emissions in oxycoal combustion

Stadler, Hannes; Christ, Dominik; Habermehl, Martin; Heil, P.; Kellermann, A.; Ohliger, Andreas; Toporov, Dobrin; Kneer, Reinhold

doi:10.1016/j.fuel.2010.11.026

Cited by 90 publications

(37 citation statements)

References 30 publications

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“…Also, they found that the alteration from conventional to MILD oxy-combustion allows for a lower oxygen concentration in the oxidizer to establish stable combustion. In their recent experimental study of oxycoal combustion, Stadler et al 10 analyzed the formation and reduction mechanisms of NO x in the conventional and MILD oxy-combustion processes and found that the flue gas recirculation reduces both the total NO x yield and the conversion of fuel N to NO. Particularly, their investigation indicates that wet recirculation is more preferable in terms of NO x emission.…”

Section: Introductionmentioning

confidence: 99%

Moderate or Intense Low-Oxygen Dilution Combustion of Methane Diluted by CO₂ and N₂

Zhang

et al. 2015

Energy Fuels

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Moderate or intense low-oxygen dilution (MILD) combustion is regarded as one of the most effective technologies to achieve extremely low NO x emissions of combustion. MILD combustion diluted by CO 2 and by N 2 are herein termed "MILD oxy-combustion" and "MILD air combustion", respectively. The present study is to investigate the difference of the two by experimental observation in a furnace of 20 kW and chemical kinetics calculation of a well-stirred reactor (WSR). Also, to identify their difference in mechanism, reaction paths of combustion diluted with N 2 and CO 2 are examined. It is revealed that the region of MILD oxy-combustion is notably larger than that of MILD air combustion for gaseous fuels, which suggests that the requirement for establishing MILD combustion is less stringent with dilution by CO 2 than by N 2 . The key reason is that the CO 2 dilution substantially lowers the temperature rise because of combustion, delays the ignition, and slows the overall reaction rate, thus facilitating the occurrence of MILD combustion. Detailed analyses show that the temperature reduction derives from the physical effect of CO 2 dilution, while the ignition delay results mainly from the chemical effect. Moreover, the investigation of reaction paths suggests that the CO 2 dilution increases the local CO production mainly through H + CO 2 → OH + CO and CO 2 + CH 2 (s) → CO + CH 2 O.

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Section: Introductionmentioning

confidence: 99%

Moderate or Intense Low-Oxygen Dilution Combustion of Methane Diluted by CO₂ and N₂

Zhang

et al. 2015

Energy Fuels

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“…The ratios of NO exhausted in oxy-coal to that in air combustion from the literatures (Andersson et al, 2008;Shaddix et al, 2011;Stadler et al, 2011;Zhang et al, 2011;Liu et al, 2012).…”

Section: Figmentioning

confidence: 99%

“…Fig. 1 shows the ratio of NO exhausts from oxy-coal to that from air combustion ranging from 1.25% to 81.8% (Andersson et al, 2008;Shaddix and Molina, 2011;Stadler et al, 2011;Zhang et al, 2011;Liu et al, 2012). The great difference indicates that the coal properties and experimental conditions may largely influence NO reducing potentials.…”

Section: Introductionmentioning

confidence: 99%

“…Shaddix and Molina (2011) put forward that 20% NO was removed in oxy-coal combustion. And while Zhang et al (2011) pointed that the NO x emission amount was 40% lower in oxy-coal than in air combustion, Stadler et al (2011) revealed NO emission from oxy-coal combustion shares two-thirds proportion of that from air when German lignite was combusted in a vertical pilotscale furnace. Still Liu et al (2012) stated that NO emission from oxy-coal combustion with partial CO 2 removal from the RFG was decreased to 1.25% of that in air combustion.…”

Section: Introductionmentioning

confidence: 99%

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NO Reduction Scale of Three Typical Chinese Coals during Oxy-Coal Combustion

Luo

Yao

2015

Aerosol Air Qual. Res.

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Oxy-coal combustion has become one of the most promising technologies for its ability to capture carbon dioxide and produce low pollutant emissions. In particular, the NO emission from oxy-coal combustion is found to be much lower than that in air combustion, but the NO reduction degree varies. In order to ascertain a rough NO reduction potential for Chinese coals, three types of coals (lignite, bituminous coal and anthracite) were combusted in a drop-tube furnace (DTF) in air and oxy-coal atmosphere during this study. The results showed that oxy-coal combustion could largely reduce NO emission down to 50% for the three coals. The NO reducing potential of oxy-coal technology for the lignite was higher than that for the bituminous coal and the anthracite. High content of volatiles in the lignite was considered as the major reason. NO removal was suppressed in the bituminous coal combustion due to the impacts of CaO and Fe 2 O 3 .

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“…These specific operating conditions have strong effects on flame stability, heat transfer and pollutant emissions. Several experimental investigations already exist concerning different fuels, either coal [3,4] or gaseous fuels [5][6][7]. With propane, Andersson et al [5] have compared combustion in air and O 2 / CO 2 atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of structure and stabilization of spray oxyfuel flames diluted by carbon dioxide

Cléon¹,

Honoré²,

Lacour³

et al. 2015

Proceedings of the Combustion Institute

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Experimental investigation of NO emissions in oxycoal combustion

Cited by 90 publications

References 30 publications

Moderate or Intense Low-Oxygen Dilution Combustion of Methane Diluted by CO₂ and N₂

Moderate or Intense Low-Oxygen Dilution Combustion of Methane Diluted by CO₂ and N₂

NO Reduction Scale of Three Typical Chinese Coals during Oxy-Coal Combustion

Experimental investigation of structure and stabilization of spray oxyfuel flames diluted by carbon dioxide

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Experimental investigation of NO emissions in oxycoal combustion

Cited by 90 publications

References 30 publications

Moderate or Intense Low-Oxygen Dilution Combustion of Methane Diluted by CO2 and N2

Moderate or Intense Low-Oxygen Dilution Combustion of Methane Diluted by CO2 and N2

NO Reduction Scale of Three Typical Chinese Coals during Oxy-Coal Combustion

Experimental investigation of structure and stabilization of spray oxyfuel flames diluted by carbon dioxide

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Moderate or Intense Low-Oxygen Dilution Combustion of Methane Diluted by CO₂ and N₂

Moderate or Intense Low-Oxygen Dilution Combustion of Methane Diluted by CO₂ and N₂