Study on combustion and ignition characteristics of natural gas components in a micro flow reactor with a controlled temperature profile
Study on combustion and ignition characteristics of natural gas components in a micro flow reactor with a controlled temperature profile
复制标题
DOI：
10.1016/j.combustflame.2013.08.013
复制
发表时间：
2014
影响因子：
4.4
通讯作者：
T. Kamada;H. Nakamura;T. Tezuka;S. Hasegawa;K. Maruta
中科院分区：
文献类型：
--
作者：
T. Kamada;H. Nakamura;T. Tezuka;S. Hasegawa;K. Maruta
利用可控温度分布的微型流动反应器，对甲烷、乙烷、丙烷和正丁烷等天然气组分的燃烧和着火特性进行了实验和计算研究。特别注意了在低流速区域观察到的微弱火焰。用详细的天然气动力学模型进行了一维计算，成功地模拟了观测到的上述燃料的弱火焰响应。由于弱火焰的位置反映了每种燃料的着火特性和反应性，因此将实验和计算结果与研究辛烷值(RON)进行了比较，研究辛烷值是衡量普通燃料着火特性的一般指标。在1atm时，乙烷显示出这些燃料中最高的反应活性，尽管乙烷的RON(115)介于甲烷(120)和丙烷(112)之间。由于本实验和常规RON试验的压力条件不同，对这些燃料的弱火焰压力响应进行了计算研究。当压力高于4个大气压时，反应堆的燃料反应性顺序与罗恩试验的顺序一致。通过反应路径分析，找出了乙烷在1大气压下反应活性最高的原因。分析表明，C2H5+O2⇔和C2H4+HO2是一个关键反应，在1atm时促进了乙烷的氧化。通过分析，阐明了压力对反应器内燃料氧化过程的影响。此外，还通过实验和计算研究了甲烷/正丁烷混合气在不同混合比下的弱火焰响应。结果表明，在混合燃料中添加正丁烷对混合燃料的燃烧和着火特性有显著影响。
Combustion and ignition characteristics of natural gas components such as methane, ethane, propane andn-butane were investigated experimentally and computationally using a micro flow reactor with a controlled temperature profile. Special attention was paid to weak flames which were observed in a low flow velocity region. The observed weak flame responses for the above fuels were successfully simulated by one-dimensional computations with a detailed kinetic model for natural gas. Since the position of the weak flame indicates the ignition characteristics as well as the reactivity of each fuel, the experimental and computational results were compared with research octane number (RON) which is a general index for ignition characteristics of ordinary fuels. At 1 atm, ethane showed the highest reactivity among these fuels, although RON of ethane (115) is between those of methane (120) and propane (112). Since the pressure conditions are different between the present experiment and the general RON test, weak flame responses to the pressure were investigated computationally for these fuels. The order of the fuel reactivity by the reactor agreed with that by RON test when the pressure was higher than 4 atm. Reaction path analysis was carried out to clarify the reasons of the highest reactivity of ethane at 1 atm among the employed fuels in this study. The analysis revealed that C2H5+ O2⇔ C2H4+ HO2is a key reaction and promotes ethane oxidation at 1 atm. The effect of the pressure on the fuel oxidation process in the present reactor was also clarified by the analysis. In addition, weak flame responses to various mixing ratios of methane/n-butane blends were investigated experimentally and computationally. The results indicated a significant effect ofn-butane addition in the blends on combustion and ignition characteristics of the blended fuels.