Effects of component variation of natural gas on its premixed flame propagation characteristics

Effects of component variation of natural gas on its premixed flame propagation characteristics

Natural gas

Reaction kinetics

Sensitivity analysis

Combustion

Velocity

Chemical analysis

Propane

Ethane

Gases

Butane

The constant-volume combustion vessel and CHEMKIN PRO software were employed to investigate the effect of component variation of natural gas on the laminar burning velocity and flame instability at the ambient temperature and pressure and stoichiometric ratio. The results show that the laminar burning velocity of natural gas rises with the increase of ethane content, propane content and n-butane content, and the effect of the variation of ethane content on the laminar burning velocity is the most obvious. The instabilities of natural gas-air flames are decreased with the increase of ethane content, propane content and n-butane content. For inhibiting the overall instabilities of natural gas-air flames, the ability of n-butane is approximately equal to the ability of propane, both of which are greater than that of ethane. The flame structure analysis shows that the variation of the peak value of mole fraction of the radical H is the most significant when the natural gas composition fluctuates. There is a strong correlation between the laminar burning velocity of natural gas and the maximum values of the sum of mole fractions of OH and H. The sensitivity analysis of the laminar burning velocity and the net reaction rate analysis show that the natural gas component variation affects the important elementary reactions. The competition between the elementary reactions with positive impacts and the ones with negative impacts varies the peak of H mole fraction and the variation of ethane content has the greatest effect on the mole fraction of H. All Right Reserved.

5209-5219

12

69

Huagong Xuebao/CIESC Journal

2018

Zhang, Zunhua

Zeng, Xuan

Liang, Junjie

Wang, Zhaojun

Li, Gesheng

journalArticle

4381157

10.11949/j.issn.0438-1157.20180601