Experimental Investigation on MILD Oxy-combustion of Methane Under CO2, H2O and N2 Dilution

被引：0
|
作者：
Wang G. [1 ]
Shu Z. [2 ]
Si J. [1 ]
Wang B. [3 ]
Zhu R. [4 ]
Mi J. [1 ]
机构：
[1] College of Engineering, Peking University, Haidian District, Beijing
[2] China Ship Development and Design Center, Wuhan
[3] Beijing Municipal Office for Science and Technology Awards, Haidian District, Beijing
[4] School of Metallurgical and Ecological Engineering, University of Science & Technology Beijing, Haidian District, Beijing
来源：
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2021年 / 41卷 / 18期
基金：
中国国家自然科学基金;
关键词：
CO[!sub]2[!/sub] dilution; H[!sub]2[!/sub]O dilution; Moderate or intense low-oxygen dilution (MILD) oxy-combustion; N[!sub]2[!/sub] dilution; NO[!sub]x[!/sub] emission; Nonpremixed; Oxygen concentration;
D O I：
10.13334/j.0258-8013.pcsee.201619
中图分类号：
学科分类号：
摘要：
The moderate or intense low-oxygen dilution (MILD) oxy-combustion is an innovative technology of combustion, which can simultaneously realize low carbon and ultra-low NOx emissions. This work experimentally investigated the combustion and emission characteristics of non-premixed MILD oxy-combustion firing methane under various oxidant conditions, such as, diluent type, oxygen concentration XO2, equivalence ratio Φ and oxidant preheating temperature Tin. Results show that no flame is observed in all the investigated cases under N2, CO2 or H2O dilution. However, when N2 is used as the diluent, the in-furnace temperature and the NO emission are very high, and NO emission increase abruptly (>100×10-6) at higher XO2, Φ, or Tin. Thus, MILD oxy-combustion cannot be well established under N2 dilution. Relatively, under CO2 or H2O dilution, the in-furnace temperature and the NO emission (<10×10-6) are very low and not sensitive to the variations of XO2, Φ and Tin. Therefore, low emission MILD oxy-combustion can be realized in a wide range of oxidant conditions under CO2 or H2O dilution. Moreover, the CO emission is high (>20×10-6) under CO2 dilution, but it is nearly zero under H2O dilution. The NO emission (≈1×10-6) is also lower for the latter. Therefore, H2O dilution is most beneficial for establishing ultra-low emission MILD oxy-combustion. Cautiously, when use H2O dilution for practical application, the prevention should be made from the furnace wall absorbing water, which will reduce thermal efficiency and even make extinction to occur. © 2021 Chin. Soc. for Elec. Eng.
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页码：6312 / 6320
页数：8
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