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Effects of gas content and ambient temperature on combustion characteristics of methane hydrate spheres
Gas Science and Engineering ( IF 5.285 ) Pub Date : 2021-01-30 , DOI: 10.1016/j.jngse.2021.103842
Gan Cui , Zengrui Dong , Kai Xie , Shun Wang , Tao Guo , Jianguo Liu , Xiao Xing , Zili Li

Methane hydrate has the potential to become a high quality medium for gas storage and a special fuel because of its high efficiency for gas storage and its combustibility. It is important to study the factors that affect the combustion characteristics of methane hydrate. In this paper, the effects of gas content and ambient temperature on the combustion of methane hydrate spheres are investigated experimentally. The combustion flame of methane hydrate spheres with high gas content is bright yellow, whereas the combustion flame of methane hydrate spheres with low gas content is dim blue. With an increase in gas content, the methane hydrate sphere is easier to ignite and the combustion rate, residual gas content, flame height, flame oscillation frequency, and flame brightness all increase. However, the flame temperature at a height of 3 cm from the center of the sphere decreases. This is mainly because of the combustion of hydrate spheres with high gas content in a severe fuel excess state. The combustion characteristics of methane hydrate spheres in the ambient temperature range of 293 K–303 K are very similar. Also, the flame is bright yellow with insufficient combustion. With an increase in the ambient temperature, there are no differences in the residual gas content of methane hydrate spheres; the combustion rate, flame height, flame oscillation frequency, and flame brightness decrease slightly, and this is related to the self-preservation process. However, the flame temperature at a height of 6 cm from the center of the sphere increases. The increase in ambient temperature may have a similar effect with a decrease in gas content, and the root cause of this is that the slower release of methane is beneficial for mixing with the air in a better proportion. In addition, the combustion is more sufficient. The slower emission of combustion products also reduces the flow velocity, weakens the oscillation of the flame, and improves the stability of the flame.



中文翻译:

气体含量和环境温度对甲烷水合物球燃烧特性的影响

甲烷水合物因其高效的储气效率和可燃性而有潜力成为一种高质量的储气介质和特殊燃料。研究影响甲烷水合物燃烧特性的因素很重要。本文通过实验研究了气体含量和环境温度对甲烷水合物球燃烧的影响。气体含量高的甲烷水合物球的燃烧火焰为亮黄色,气体含量低的甲烷水合物球的燃烧火焰为暗蓝色。随着气体含量的增加,甲烷水合物球更容易点燃,并且燃烧速率,残留气体含量,火焰高度,火焰振荡频率和火焰亮度都增加。然而,距球体中心3厘米高的火焰温度降低。这主要是因为在严重的燃料过剩状态下,高气体含量的水合物球体会燃烧。甲烷水合物球在293 K–303 K的环境温度范围内的燃烧特性非常相似。另外,火焰为鲜黄色,燃烧不充分。随着环境温度的升高,甲烷水合物球体的残留气体含量没有差异;燃烧速率,火焰高度,火焰振荡频率和火焰亮度略有下降,这与自保存过程有关。但是,距球体中心6厘米高的火焰温度会升高。环境温度的升高可能会导致气体含量降低而产生类似的影响,并且其根本原因是甲烷的缓慢释放有利于与空气以更好的比例混合。另外,燃烧更加充分。燃烧产物的较慢排放还降低了流速,削弱了火焰的振荡,并提高了火焰的稳定性。

更新日期:2021-02-05
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