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Journal of the Japan Institute of Energy Vol. 79 (2000), No. 4

ISIJ International
belloff
ONLINE ISSN: 1882-6121
PRINT ISSN: 0916-8753
Publisher: The Japan Institute of Energy

Backnumber

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Journal of the Japan Institute of Energy Vol. 79 (2000), No. 4

Studies on Fuel Savings and NOx Reduction in Oxygen Enriched Air Combustion (I)

Makoto NISHIMURA, Mamoru SUYARI, Tomio SUZUKI, Toshimi TAKAGI

pp. 321-328

DOI:

10.3775/jie.79.321

Abstract

The combustion with oxygen enriched air has a potential of the fuel savings and the consequent reduction of carbon dioxide emission. The fuel savings were examined by the enthalpy of equilibrium state in case of oxygen enriched combustion. The fuel consumption in case of 30-40% oxygen enriched air is reduced by 20-30% as compared with the case of 21% oxygen air. However, NO emission increases with the enrichment of oxygen in the air. The effect of oxygen enriched air on NO emission in the methane premix flame was numerically analyzed with detailed chemistry for the equivalent ratio of 0.5-2.0 The results revealed that the low NOx combustion with 30% oxygen enriched air can be achieved in case of the fuel lean (φ<0.6) or fuel rich (φ>1.5) condition. It was also shown that the burning velocity with oxygen enriched air is considerably high even at the fuel lean and fuel rich condition.

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Studies on Fuel Savings and NOx Reduction in Oxygen Enriched Air Combustion (II)

Makoto NISHIMURA, Mamoru SUYARI, Tomio SUZUKI, Toshimi TAKAGI

pp. 329-337

DOI:

10.3775/jie.79.329

Abstract

The combustion with oxygen enriched air has a potential of the fuel savings and the consequent reduction of carbon dioxide emission. The fuel savings were examined by the enthalpy of equilibrium state in case of oxygen enriched combustion. The fuel consumption in case of 30-40% oxygen enriched air is reduced by 5.9-9.1% as compared with the case of 21% oxygen air at exhaust temperature 773K after whichsensible heat of exhaust gas exchange the sensible heat of combustion air. However, NO emission increases with the enrichment of oxygen in the air and the increase of initial temperature. The effect of oxygen enriched air and initial temperature on NO emissions in the methane premix flame was numerically analyzed with detailed chemistry for the equivalent ratio of 0.5-2.0. The results revealed that the low NOx combustion with 30% oxygen enriched air can be achieved in case of the fuel rich (φ>2.0) condition. Furthermore, the effect of oxygen enriched air and entrainment of exhaust gas was analyzed numerically. The low NOx combustion with 30% oxygen enriched air and initial temperature 798K can be achieved in case of the fuel lean (φ<0.5) or fuel rich (φ>1.5) condition and mixing ratio 0.5 which is expressed that the ratio mole of exhaust gas against the mole of fuel and oxygen enriched air.

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Studies on Fuel Savings and NOx Reduction in Oxygen Enriched Air Combustion (II)

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