Study On The Dynamic Effect Of Vibrational Excited States In Non-equilibrium Plasma Reforming CH₄/CO₂ Process

The use of non-equilibrium plasma on the reaction gas discharge into the target product is a hot spot in the research of plasma applications nowadays.Researchers have done a great deal of work in the field of methane conversion using non-equilibrium plasma discharge and have achieved fruitful results.However,due to the complexity of the plasma group and the lack of modern measurement technology,there is still not a generally accepted result for the detailed chemical reaction kinetics of the discharge process.In the process of setting up a detailed discharge model,researchers often need to simplify and approximate the entire discharge process to get the final approximately complete chemical reaction kinetic model.While ignored the impact of many processes during the discharge reaction,such as a large number of electron impact excitation processes during discharge.Due to the limitations of current theoretical knowledge,this paper mainly focuses on the electronic vibration excitation process in the electron collision excitation process.In this paper,based on HP-mech,we consider the generation of the vibrational particles in the reaction and the subsequent participation in the discharge process,to complete the whole CH4/CO2/He discharge model.The whole discharging reaction kinetics process is studied,and the influence and action of the vibration excitation process in the whole discharging reaction are mainly considered.The main contents are as follows:(1)Consider the generation of the main products and reactants corresponding to the vibrational state particles in the discharge process.Firstly,the CH4/CO2/He discharge mechanism was collected,the vibrational level of each particle and the electron impact cross section of each process were calculated,and then the rate of energy relaxation process involved in the vibrational state of the particle and the elementary reaction rate of the vibrational state particle participating in the chemical reaction were calculated,so as to complete the CH4/CO2/He discharge model.(2)An experimental platform was set up to measure the concentration of important components after CH4/CO2/He discharge at a power of 5-25W by GC,and compared with the simulation results of the constructed model to verify the model accuracy.(3)Using the constructed CH4/CO2/He reaction model to solve the energy loss of each process and EEDF in discharge process,and then ananalyzed the discharge characteristics of the process of discharge reaction.(4)Through the CH4/CO2/He discharge reaction model,analysised the the main formation and consumption path of each product and its sensitivity so as the generation and consumption path of the main vibrational states in the model.And then point out some important reaction paths of the main generation and consumption path of the vibrational state particles and their participation in the chemical reaction process.