Experimental study of influence of temperature on fuel-N conversion and recycle NO reduction in oxyfuel combustion

Sun, Shaozeng; Cao, Huali; Chen, Hao; Wang, Xiaoyu; Qian, Juan; Wall, Terry

doi:10.1016/j.proci.2010.06.014

Cited by 55 publications

(30 citation statements)

References 20 publications

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“…Gasification of the char with CO 2 may have contributed to an increase in the production of CO during oxy-fuel combustion. Furthermore, the recent results of experimental investigation on NO x formation during the oxy-fuel combustion of pulverized coal published by Shaddix and Molina [5] and Sun et al [27] lead to the conclusion that fuel-N conversion to NO in O 2 /CO 2 is lower than in O 2 /N 2 , and that this may contribute to a lower NO concentration. Yoshiie et al [28] found that the NO emissions and conversions of fuel nitrogen to NO under oxy-fuel combustion conditions were lower than that under air combustion conditions without adding NO in the fed atmosphere.…”

Section: No Emissionsmentioning

confidence: 99%

Oxy-fuel combustion of coal and biomass blends

Riaza

Gil

Álvarez

et al. 2012

Energy

153

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The ignition temperature, burnout and NO emissions of blends of a semi-anthracite and a high-volatile bituminous coal with 10 and 20 wt.% of olive waste were studied under oxy-fuel combustion conditions in an entrained flow reactor (EFR). The results obtained under several oxy-fuel atmospheres (21%O 2 -79%CO 2 , 30%O 2 -70% CO 2 and 35%O 2 -65%CO 2 ) were compared with those attained in air. The results indicated that replacing N 2 by CO 2 in the combustion atmosphere with 21% of O 2 caused an increase in the temperature of ignition and a decrease in the burnout value. When the O 2 concentration was increased to 30 and 35%, the temperature of ignition was lower and the burnout value was higher than in air conditions. A significant reduction in ignition temperature and a slight increase in the burnout value was observed after the addition of biomass, this trend becoming more noticeable as the biomass concentration was increased. The emissions of NO during oxy-fuel combustion were lower than under air-firing. However, they remained similar under all the oxy-fuel atmospheres with increasing O 2 concentrations. Emissions of NO were significantly reduced by the addition of biomass to the bituminous coal, although this effect was less noticeable in the case of the semianthracite.

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Section: No Emissionsmentioning

confidence: 99%

Oxy-fuel combustion of coal and biomass blends

Riaza

Gil

Álvarez

et al. 2012

Energy

153

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“…Recently, new results of experimental investigations on NO x formation during oxy-fuel combustion of pulverised coal have been published by and Sun et al (2010).…”

Section: No X Emissionmentioning

confidence: 99%

Oxy-fuel coal combustion—A review of the current state-of-the-art

Scheffknecht

Al-Makhadmeh

Schnell

et al. 2011

International Journal of Greenhouse Gas Control

492

246

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“…The previous research showed that the influences of combustion temperature on NO formation from volatile-N were contrary between reducing and oxidizing atmospheres [32]. The increase in pressure did not significantly affect the NO creation but generated preferential conditions for NO reduction [29].…”

Section: Introductionmentioning

confidence: 92%

Experimental Study on NOx Reduction in Oxy-fuel Combustion Using Synthetic Coals with Pyridinic or Pyrrolic Nitrogen

Wang

Zhao

et al. 2018

Applied Sciences

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Oxy-fuel combustion technology can capture carbon dioxide (CO2) in the large-scale and greatly lower nitrogen oxides (NOx) emission in coal-fired power plants. However, the influence of inherent minerals on NOx reduction still remains unclear and the impact of oxy-fuel combustion on the transformation of different nitrogen functional groups has yet to be fully understood. The present work aims to obtain a further understanding of the NOx reduction during oxy-fuel combustion using synthetic coals with pyrrolic or pyridinic nitrogen. Compared to pyridinic nitrogen, more of the pyrrolic nitrogen in synthetic coal was converted to NOx. The conversion ratio of nitric oxide (NO) first increased significantly with the rising oxygen content and then trended to an asymptotically constant as the oxygen (O2) content varied between 10–50%. The nitrogen dioxide (NO2) formation was roughly proportional to the oxygen content. The NO2 conversion was increased with particle size but the case of NO showed a non-monotonic variation. The catalytic effects of sodium carbonate (Na2CO3), calcium carbonate (CaCO3), and ferric oxide (Fe2O3) on the transformation of pyridinic nitrogen to NO were independent of the combustion atmosphere, while the alteration from air to the oxy-fuel combustion led to a change of mineral catalytic effect on the oxidation of pyrrolic nitrogen within the coal matrix.

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Experimental study of influence of temperature on fuel-N conversion and recycle NO reduction in oxyfuel combustion

Cited by 55 publications

References 20 publications

Oxy-fuel combustion of coal and biomass blends

Oxy-fuel combustion of coal and biomass blends

Oxy-fuel coal combustion—A review of the current state-of-the-art

Experimental Study on NOx Reduction in Oxy-fuel Combustion Using Synthetic Coals with Pyridinic or Pyrrolic Nitrogen

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