Theoretical Model for Predicting the Upper Flammability Limit of Hydrocarbons Diluted with Nitrogen
Inerting wchich is the process of adding inert gas to a combustible mixture to reduce the range between the upper flammability limit (UFL) and lower flammability limit (LFL) is one of the important safe practices for handling a flammable vapor or gas. As the fact that the concentration of inert nitrogen has tittle effect on LFL, the prediction of UFL is crucial to an inert procedure with nitrogen. Three assumptions about the combustion conditions at UFL are presumed true in this study: (1) the oxygen reacts completely at UFL;(2) the stoichiometric coefficients of a combustion reaction occurring at UFL does not change by the presence of inert gas;(3) the adiabatic temperature rises are the same for all limit mixture at UFL. Based on aforementioned three assumptions, a theoretical model to predict the UFL of a mixture composed of hydrocarbon and nitrogen is then derived analytically. Experimental results reported in a recent work by Knodo et al. are used to examine the proposed theoretical model. The experiment data employed here include the cases of methane, propane, ethylene and propylene. It was found from regression analysis that the coefficients of determination (R2) of the regressions are larger than 0.99 in all the cases studied. Thus, the proposed linear relation is positively supported by existing experimental results.
flammable limits inerting predictive model
CHEN Chan-Cheng WANG Tzu-Chi LIAW Horng-Jang CHEN Hui-Chu
Department of Occupational Safety and Health,China Medical University,Taichung 404,Taiwan,China Department of Chemical Engineering,Chinese Culture University,Taipei 111,Taiwan,China
国际会议
The 2008 International Symposium on Safety Science and Technology(2008年安全科学技术国际会议)
北京
英文
1249-1255
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）