Research On The Components Distribution And Properties Of Reformed Fuel Molecular

In this thesis a fuel reforming method was raised.An active high temperature flow reaction system was designed and set up to explore fuel reforming conditions and the components distribution.The system can achieve the experimental conditions for any oxygen concentration through the adjustment of the external gas mass flow.By the adjustment of the flow rate of carrier gas and the segmented sampling design,the system can realize the flexible adjustment of the reaction time.The same temperature of any reaction section can be realized by the segmented and intelligent temperature control.A pressure self-adjustment pressure differential oil supply system was used,and a micro-hole nozzle was used to make sure the oil can be injected continuously.The reforming process and the reformed fuel characteristics are simulated based on the detailed chemical kinetics to validate the experimental results and analysis the reformed fuel characteristics.The reforming conditions and the reformed fuel small molecular distribution of the n-heptane aerobic reforming were studied.Initial oxygen concentration,reformed time and reformed temperature are the main influence factors of n-heptane aerobic reforming.Under the same reformed time and temperature,the higher the concentration of oxygen,the higher n-heptane reformed ratio.At the beginning of the aerobic reforming reaction,the n-heptane molecular is reformed to C₀^C₃ small molecular.C₂H₄,CH₄ and H₂ are the main reformed products.After a period of time,part of the reformed products might be oxidized,the small molecule concentration decreased,and the higher the concentration of oxygen,the more products being oxidized.To achieve a high n-heptane reformed rate and high yields of C₀^C₃ small molecular,the reformed temperature might be higher than 1000 K,the reformed time might be less than 50 ms and the initial oxygen concentration might be lower than5%.It revealed that during the aerobic reforming,the oxygen will cause the loss of fuel available.The anaerobic reforming conditions of the n-heptane,n-butanol and gasoline-surrogate were studied.With a reformed temperature higher than 1050 K,and reformed time more than 100 ms,the fuel reformed ratio can be more than 90%.In the temperature range studied,the toluene contained in the gasoline-surrogate cannot be reformed,so the highest reformed ratio might be 80%.The fuel high temperature anaerobic reforming process can be divided into three processes based the reformed temperature.The slow reforming of the fuel,the large amount production of C₀^C₃ and the conversion process of C₂H₄ to C₂H₂.With a reformed temperature between 1050 K and 1200 K and a reformed time about 100 ms,a good reformed effect can be reached.With a reformed temperature of 1100 K and reformed time of100 ms,the C₀^C₃ components volume ratio of the n-heptane and n-butanol anaerobic reforming fuel molecular is higher than 90%,and the C₀^C₃ components volume ratio of the gasoline-surrogate anaerobic reforming fuel molecular is higher than 70%.Experimental study on the distribution of small molecules in the actual gasoline anaerobic reforming was carried out.In the reforming conditions of 1100 K and 100ms,the small molecular distribution of the actual gasoline reforming is compared with that of gasoline-surrogate.The concentration of CH₄ of the actual gasoline anaerobic reforming products is significantly higher than that of gasoline-surrogate,while the H₂concentration was significantly lower than that of gasoline-surrogate.The C₀^C₃component volume ratio reached 74.65%of the actual gasoline anaerobic reforming.The feasibility of the actual gasoline high temperature anaerobic reforming was validated.The effects of high temperature anaerobic fuel reforming on the chemical availability distribution of fuel molecules,the ignition delay,and the exergy loss during the combustion process are studied.After a high temperature anaerobic fuel reforming,the reformed fuel molecular can gain a high availability,a longer ignition delays and a less exergy loss during the combustion process.