Discussion on Engineering Prediction Method of Lower Explosion Limit of Combustible Gas Under High Temperature Working Conditions
Obtaining the lower explosion limit of combustible gas under specific operating conditions is the basis for conducting explosion risk assessment and explosion prevention.Existing research has basically understood the influence of temperature on the lower explosion limit of gas,but there is still a lack of engineering methods that can be easily used to predict the lower explosion limit of different types of gas at high temperatures.Based on the lower explosion limit data of different types of gas at different temperatures and atmospheric pressure given in the literatures,a relationship for predicting the lower explosion limit LELT at temperature T from the value LELTo at reference temperature T0 was proposed as follows:(LELT/LELT0)=1.3-0.3(T/T0).The applicable ranges were 1≤T/T0≤2 and T≤723K.The predicted values were compared with the experimental ones in the literature.It was found that the predicted results were lower than the experimental results and tended to be safe in engineering application.When T/T0 was within the range of 1 to 1.5,the relative errors of prediction results werelower than-6%,which had good accuracy.When T/T0 was within the range of 1.5 to 2,the relative errors of the prediction results were almost all within-16%,which still had good reliability.This formula can be used to predict the lower explosion limit of NH3,H2,CO,CH4,C2H4,C2H2 gases in air at atmospheric pressure and high temperature.
NETL
NSTL
万方数据
维普
