Nonpremixed Air/Oxygen Jet Burner to Improve Moderate or Intense Low-Oxygen Dilution Combustion Characteristics in Oxygen-Enriched Conditions
Nonpremixed Air/Oxygen Jet Burner to Improve Moderate or Intense Low-Oxygen Dilution Combustion Characteristics in Oxygen-Enriched Conditions
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非预混空气/氧气喷射燃烧器可改善富氧条件下的中度或强烈低氧稀释燃烧特性
DOI：
10.1021/acs.energyfuels.1c00656
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发表时间：
2021-06
期刊：
影响因子：
5.3
通讯作者：
Liu Hao
中科院分区：
文献类型：
--
作者：
Xu Shunta;Xie Yihao;Huang Pu;Ren Hao;Tu Yaojie;Liu Hao
为了改善富氧条件下中等或强烈低氧稀释（MILD）燃烧特性，设计了一种不同于预混燃烧器的空气/氧气非预混射流燃烧器。采用预混和非预混空气/氧气射流燃烧器，对不同氧浓度（19.5-36%）和速度（47.16-261.18 m/s）下富氧天然气MILD燃烧性能进行了数值研究。结果表明，MILD燃烧产生更高的峰值温度和NO排放量时，氧气浓度是丰富的两个燃烧器，由于缺乏理想的混合反应物与烟道气所造成的氧化剂的速度降低。与预混空气/氧气射流相比，非预混氧气/空气射流降低了炉内最高温度，具有更高的热均匀性，而与氧气浓度无关，因此在25、30.5和36%氧气浓度下的净NO排放从43.3、73.4和112.9 ppm@6%O2减轻到29.4、47.1和71.7 ppm@6%O2，主要是由于热NO还原。与富氧效果不同，在保持空气流速不变的情况下，提高氧气射流速度可以进一步改善富氧MILD燃烧及其NO排放特性。总的来说，非预混空气/氧气射流燃烧器可以提供低NO排放，如果燃烧空气具有低氧含量，而使用的非预混空气/氧气射流燃烧器与高氧气流速一起建议，以避免在高富氧条件下的高NO排放水平。此外，总热通量的增加，随着氧气浓度的增加，主要来自辐射传热的增强;然而，较高的对流和较低的辐射热通量的情况下，观察到高氧气射流速度。
To improve moderate or intense low-oxygen dilution (MILD) combustion characteristics in oxygen-enriched conditions, this study reported the design of a nonpremixed air/oxygen jet burner that is different from a premixed one. Implementing the premixed and nonpremixed air/oxygen jet burners, the performance of oxygen-enriched natural gas MILD combustion was numerically investigated under different oxygen concentrations (19.5–36%) and velocities (47.16–261.18 m/s). The results show that MILD combustion yields a higher peak temperature and NO emission when the oxygen concentration is enriched for both burners due to the lack of desirable mixing of reactants with flue gases resulting from the reduced oxidizer velocity. Compared to the premixed air/oxygen jet, the nonpremixed oxygen/air jet reduces the in-furnace maximum temperature with higher thermal uniformity regardless of the oxygen concentration and thus the net NO emission at 25, 30.5, and 36% oxygen concentration is mitigated from 43.3, 73.4, and 112.9 ppm@6%O2to 29.4, 47.1, and 71.7 ppm@6%O2, respectively, mainly due to the thermal NO reduction. Unlike the oxygen-enrichment effect, increasing the oxygen jet velocity while maintaining a fixed air velocity can further improve oxygen-enriched MILD combustion and its NO emission behaviors. Overall, the nonpremixed air/oxygen jet burner can provide low NO emission if combustion air with low oxygen contents is employed, while the usage of the nonpremixed air/oxygen jet burner together with high oxygen velocity is suggested to avoid a high NO emission level in highly oxygen-enriched conditions. Moreover, the total heat flux enhances as the oxygen concentration is increased, mainly from the radiative heat transfer enhancement; however, higher convective and lower radiative heat fluxes are observed in the case with high oxygen jet velocity.
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影响因子：
7.4
作者：
Yewen Tan;M. Douglas;K. Thambimuthu
通讯作者：
Yewen Tan;M. Douglas;K. Thambimuthu
DOI：
10.1201/9781420041033
发表时间：
2002-12
期刊：
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影响因子：
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作者：
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影响因子：
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作者：
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DOI：
10.1016/j.proci.2006.07.135
发表时间：
2007
期刊：
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影响因子：
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作者：
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