As an emerging clean coal combustion technology, Moderate or Intense Low-Oxygen Dilution (MILD) combustion or oxy-fuel combustion, compared with traditional coal combustion, has many advantages. However, compared with MILD combustion and oxy-fuel combustion, MILD-oxy combustion is believed more attractive. In this work, MILD-oxy combustion characteristics with oxygen concentrations from 10% to 50% are studied numerically. The results show that within a certain range, increasing the oxygen concentration is in favor of MILD-oxy combustion performance close to that of MILD-air combustion. When the oxygen concentration is higher enough, the momentum reduced by the increase of oxygen concentration has a great influence on the furnace temperature. With the increase of oxygen concentration, the radiation heat transfer is enhanced and the convective heat transfer is weakened. The increase of oxygen concentration can promote the occurrence of char gasification reaction with CO₂. In addition, MILD-oxy combustion has a large impact on CO emission.

作为新兴的清洁煤燃烧技术，与传统的煤燃烧相比，中度或强烈的低氧稀释（MILD）燃烧或含氧燃料燃烧具有许多优势。然而，与轻度燃烧和含氧燃料燃烧相比，轻度燃烧被认为更具吸引力。在这项工作中，数值研究了氧气浓度为10％至5​​0％的MILD-氧气燃烧特性。结果表明，在一定范围内，增加氧气浓度有利于使MILD-氧气燃烧性能接近于MILD-空气燃烧。当氧浓度足够高时，因氧浓度增加而降低的动量对炉温有很大影响。随着氧气浓度的增加，辐射传热增强，对流传热减弱。氧气浓度的增加可以促进与CO发生炭化反应的发生₂。另外，轻度氧化燃烧对CO排放有很大影响。