基于绝热火焰温度混合气体爆炸下限的预测

准确地预测可燃混合气体的爆炸极限,对防止工业生产中时有发生的混合气体爆炸事故有着重大的意义。通过采用Gaseq软件计算CH4,C3H8,C2H4,C3H6,CH3OCH3和CO的绝热火焰温度(CAFT),分析初始温度对甲烷和丙烷混合气体(体积比1∶1)爆炸下限(LEL)的影响。结果表明:随着初始温度的升高,临界火焰温度基本不变,而LEL线性下降。使用计算绝热火焰温度法对不同比例的二元混合气体(体积比1∶1,3∶1,1∶3)以及三元混合气体(体积比1∶1∶1)的LEL进行预测,在选取的35组不同组份的混合气体中,LEL的预测值与文献值的平均绝对误差为0.081 8,平均相对误差为0.02。

Prediction on Lower Explosive Limit of Mixed Gases Based on Calculated Adiabatic Flame Temperatures

Accurately predicting the explosion limit of flammable gas mixtures is of great significance to prevent explosion accidents in industrial processes.In this paper,the software Gaseq was used to obtain the calculated adiabatic flame temperatures(CAFT) of methane,propane,ethylene,propylene,dimethylether and carbon monoxide.The influence of initial temperature on the LEL of gas mixture of methane and propane(1∶1) was analyzed.It was found out that LEL decreases linearly with the initial temperature,while the critical flame temperature keeps unchangeable.Then,CAFT was used to predict the LEL of binary gases mixtures with different ratios(volume ratio is 1∶1,3∶1,1∶3,respectively) and ternary gases mixtures with a ratio of 1∶1∶1.Among the 35 groups of mixtures with different components,the average absolute error is 0.081 8 between the forecast values and the experimental values,and the average relative error is 0.02.