Establishment Of Chemical Kinetics Model Of Biodiesel Substitute Mixture And Study On NO Influence

Biomass energy is the energy generated by living plants in nature using biomass as a medium to store solar energy,which belongs to the renewable energy that can be stored.Biodiesel is the most important representative of biomass energy,with high oxygen content,storage and transportation safety,combustion-friendly,recycling and other advantages,in the engine has a better application prospects.In this paper,methyl acid MD(C₁₁H₂₂O₂)and n C₇H₁₆)as an alternative mixture of biodiesel,using the error transfer direct relation diagram method,the detailed mechanism of MD and NHP is simplified,and a biodiesel replacement mixture mechanism containing 1187 components and 5191 element reactions is obtained.Based on different conditions of the shock tube experiment,jet mixing reactor test,verified the fire-burning properties of orthane and methyl acetate.The good prediction ability of Bio mechanism to the combustion reaction of orthane and methyl acetate was proved.In this paper,the NO reaction is coupled with the Bio mechanism,the effect of NO concentration on the system combustion fire delay period is studied,and it is found that:under low temperature conditions,NO is involved in the chain reaction of methyl cerephetamine and pyridane,shortening the reaction path,leading to the ignition time advance;Under high temperature conditions,NO reaction activity is high,participating in the system reaction,capturing the free radical of the reaction process,reducing the carbon chain rate,resulting in delayed ignition time.The reaction path analysis by using Cantera program is found that in the low NO concentration low temperature stage,MD and NHP are mainly formed by dehydrogenation reactions with small molecular free radicals（?）H,Among them:in the low NO concentration,high temperature stage,MD and NHP through（?）H and H（?）₂ of the dehydrogenation ratio decreased,through the（?）dehydrogenation ratio slightly increased,the vast majority directly through the fracture reaction into small molecules olefins,methyl acrylates and alkyl,the low temperature path is almost frozen;In the high NO concentration and low temperature stage,MD and NHP are two independent reactions,MD is mainly a rapid isomerization reaction,NHP through the reaction with hydroxyl free radical dehydrogenation;In the high NO concentration and high temperature stage,MD is mainly dehydrogenation and decomposition reaction,but due to the high concentration and high temperature,the dehydrogenation ratio of MD and NHP decreases through（?）H and H（?）₂,but the dehydrogenation reaction of （?）H is still mainstream.