US EPA

6129202 

Journal Article 

Theoretical estimation of the lower flammability limit of fuel-air mixtures at elevated temperatures and pressures 

Wan, Xin; Zhang, Qi; Shen, S 

2015 

Yes 

Journal of Loss Prevention in the Process Industries
ISSN: 0950-4230 

36 

13-19 

10.1016/j.jlp.2015.05.001 

WOS:000358971100002 

http://www.sciencedirect.com/science/article/pii/S0950423015001229
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We present an approach for predicting the lower flammability limits of combustible gas in air. The influence of initial pressure and temperature on lower flammability limit has been examined in this study. The lower flammability limits of methane, ethylene and propane in air are estimated numerically at the pressure from one to 100 bar and the temperature from ambient to 1200 K. It was found that the predicted LFLs of methane, ethylene and propane decrease slightly with the elevated pressure at the high temperature. The LFLs variation for methane-air mixture is 0.17, 0.18, 0.18 volume% with the initial pressure from one to 100  bar at the initial temperature of 800 K, 1000 K and 1200 K respectively, which is significantly higher than that at lower temperature. And the LFL of methane-air mixture at 1200 K and 100 bar reaches 1.03 volume% which is much lower than that at 1 bar and ambient temperature. On the other hand, the LFLs variation is 0.11–0.12 volume% for ethylene-air mixture and 0.06–0.07 volume% for propane-air mixture with the initial temperature from 800 K to 1200 K at the same range of pressure. The LFL values at high temperatures and pressures represent higher risk of explosion. 

Lower flammability limits; Adiabatic flame temperature; High temperature; High pressure; Explosion