Study On The Ignition Characteristics Of Methanol Syngas

In order to ensure energy security,reduce emissions of internal combustion engines,improve combustion efficiency of internal combustion engines,it has become a focus of attention and research to find alternative energy sources.In a large number of alternative sources of energy,methanol has some unique advantages.The use of methanol is varied,and it is an important way to use methanol by generating syngas from methanol and then direct combustion syngas.Therefore,the ignition characteristics of the methanol syngas are studied and analyzed in this paper.In order to study the ignition characteristics of the methanol syngas,a series of experimental studies have been done on the shock tube in this paper.The influence of pressure,equivalence ratio and pyrolysis degree on the ignition delay time of methanol syngas is obtained by changing the experimental gas components and adjusting the experimental gas ratio of the high pressure section and the low pressure section of the shock tube.At the same time,this paper also uses the CHEMKIN software to carry out the corresponding simulation calculation and analysis.Through the comparison and analysis of the experimental results,the following conclusions can be obtained:the change of temperature has an important influence on the ignition delay time of syngas.With the increase of temperature,the ignition delay time of syngas will be shortened.When the initial temperature is low,the increase of pressure will hinder the ignition process of syngas.And when the initial temperature is high,the increase of pressure will promote the ignition process of syngas.As the equivalent ratio decreased,O₂ content increased,the ignition delay time of syngas will be slightly shortened.As the H₂ content increased in the syngas,the ignition delay time will be shortened slightly.With the decrease of AR dilution,the ignition delay time will be significantly reduced.When the pyrolysis degree is low,the ignition characteristics of mixed gas and pure methanol are close to each other,and the ignition delay time is longer than syngas.When the pyrolysis degree is high,the ignition characteristic of the mixture is similar to that of the syngas,and the ignition delay time is significantly shortened.The results of the simulated calculation are roughly the same as the experimental results.