Effects of adiabatic flame temperature and oxygen concentration in CH4/N2/O2 non-swirl jet flames: Experimental and numerical study

IF 2.6 3区 工程技术 Q3 ENERGY & FUELS
M. Aliyu, M. Nemitallah, A. Abdelhafez, S. Said, P. Okonkwo, M. Habib
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Abstract

The combustion characteristics of oxygen-enriched air-methane (i.e., O2/N2/CH4) flames in a premixed mode are investigated using both experimentally and numerically under atmospheric conditions for emissions reduction purposes. The investigation is carried out using a gas turbine model combustor equipped with a multi-hole burner that mimics gas-turbine micromixer burners. The resulting flame is of jet type, and the velocity of the jet is kept at 5.2 m/s for all the considered flames. Models used in the numerical study include large eddy simulation, discrete ordinate, and partially premixed combustion for turbulence, radiation, and species models respectively. The numerical results are validated and a suitable agreement is achieved with experimental data. The results indicated that the temperature distribution, shape, and size of O2/N2/CH4 flames are predominantly controlled by adiabatic flame temperature (Tad). However, the oxygen fraction, rather than Tad, is responsible for the reaction progress. The emission of NO, CO, and CO2 increases with an increase in oxygen fraction, and the product formation in O2/N2/CH4 flames is less compared to their oxy-fuel (i.e., O2/CO2/CH4) counterparts, because N2 is mostly inert, compared to CO2. The latter participates significantly in flame reactions, which increases the rate of product formation in O2/CO2/CH4 flames.
CH4/N2/O2非旋流射流火焰绝热火焰温度和氧浓度的影响:实验和数值研究
为了减少排放,在大气条件下使用实验和数值方法研究了富氧空气甲烷(即O2/N2/CH4)火焰在预混合模式下的燃烧特性。该研究使用燃气轮机模型燃烧器进行,该燃烧器配备有模拟燃气轮机微混合器燃烧器的多孔燃烧器。产生的火焰是喷射型的,对于所有考虑的火焰,喷射速度保持在5.2m/s。数值研究中使用的模型包括分别用于湍流、辐射和物种模型的大涡模拟、离散纵坐标和部分预混燃烧。对数值结果进行了验证,并与实验数据取得了适当的一致性。结果表明,O2/N2/CH4火焰的温度分布、形状和大小主要受绝热火焰温度(Tad)的控制。然而,负责反应进程的是氧分数,而不是Tad。NO、CO和CO2的排放随着氧分数的增加而增加,并且与它们的氧燃料(即O2/CO2/CH4)对应物相比,O2/N2/CH4火焰中的产物形成较少,因为与CO2相比,N2大多是惰性的。后者显著参与火焰反应,这增加了O2/CO2/CH4火焰中产物的形成速率。
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来源期刊
CiteScore
6.40
自引率
30.00%
发文量
213
审稿时长
4.5 months
期刊介绍: Specific areas of importance including, but not limited to: Fundamentals of thermodynamics such as energy, entropy and exergy, laws of thermodynamics; Thermoeconomics; Alternative and renewable energy sources; Internal combustion engines; (Geo) thermal energy storage and conversion systems; Fundamental combustion of fuels; Energy resource recovery from biomass and solid wastes; Carbon capture; Land and offshore wells drilling; Production and reservoir engineering;, Economics of energy resource exploitation
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