Ignition of methane/air mixtures with inert and reactive particles heated by radiation
Ignition of methane/air mixtures with inert and reactive particles heated by radiation
复制标题
用辐射加热的惰性和反应性颗粒点燃甲烷/空气混合物
DOI：
10.1016/j.fuel.2020.118309
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发表时间：
2020-10-15
期刊：
影响因子：
7.4
通讯作者：
Han, Wenhu
中科院分区：
文献类型：
--
作者：
Ma, Junrong;Zhang, Changsuo;Han, Wenhu
本研究利用自行设计的实验装置，通过热辐射加热惰性碳化硅和活性煤颗粒，从而点燃甲烷-空气混合物。这些点火实验的目的是确定惰性颗粒和反应性颗粒之间点火特性的差异。因此，进行了一系列不同类型颗粒、辐照度、颗粒尺寸和燃料混合物当量比的点火实验，以确定这些参数对点火时间和点火温度的影响。实验结果表明，点火时间和点火温度均受燃料混合物当量比、颗粒类型和颗粒尺寸的影响，而辐照度仅影响点火时间。观察到活性颗粒的着火温度和时间分别比惰性颗粒更高和更长。此外，着火温度与颗粒尺寸成反比；而点火时间与颗粒尺寸成正比，与辐照度成反比。煤颗粒的化学反应缩小了燃料混合物的可燃极限，导致更长的时间和更高的着火温度，并且由于可能发生二次着火，因此比惰性颗粒具有更强的点火力。
This study utilizes a self-designed experimental apparatus to heat inert silicon carbide and reactive coal particles via thermal radiation in order to ignite methane-air mixtures. The objective of these ignition experiments is to determine the difference in ignition characteristics between inert and reactive particles. Therefore, a series of ignition experiments with varying types of particles, irradiances, particle sizes, and fuel mixture equivalence ratios were performed to determine the effects of these parameters on ignition time and ignition temperature. The results of the experiments indicate that ignition time and ignition temperature are both influenced by the fuel mixture equivalence ratio, particle type, and particle size, while irradiance only influences ignition time. Ignition temperature and time were observed to be higher and longer, respectively, for reactive particles than inert particles. Furthermore, ignition temperature is inversely proportional to particle size; while, ignition time is directly proportional to particle size and inversely proportional to irradiance. Chemical reaction of coal particles narrowed the flammability limit of the fuel mixtures, results in a longer time and higher ignition temperature, and causes a more powerful ignition than that of inert particles due to the possibility of secondary ignition.