Research on On-Board Ammonia Decomposition into Hydrogen Based on Piston Reactors
A method for on-board ammonia decomposition into hydrogen,based on a piston reactor,was pro-posed and its feasibility was investigated.A zero-dimensional homogeneous charge compression ignition reactor model,incorporating an optimized heat transfer model and an ammonia pyrolysis mechanism,was employed to explore the impacts of argon mole fraction,intake conditions,compression ratio,and oxygen mole fraction on ammonia conversion rate and hydrogen production rate.The role of key parameters in ammonia decomposition into hydrogen was analyzed through chemical kinetics.The results indicate that the initial temperature and oxygen mole fraction exert the most significant influence on ammonia decomposition into hydrogen.An increase in the initial temperature from 373 K to 573 K can enhance ammonia conversion rate by 80％,primarily due to the heightened reaction rate of key elements at high temperatures.The maximum level of ammonia decomposition into hydrogen is achieved when the mole fraction of oxygen reaches 0.024 8,mainly influenced by the alteration of the reaction ra-tio in the NH+H=H2+N elemental reaction.Furthermore,appropriate increases in argon mole fraction,decreases in engine speed,and elevations in initial pressure and compression ratio positively impact ammonia de-composition into hydrogen.Through the design and optimization of thermochemical boundary conditions,the pis-ton reactor can serve as an effective technology for on-board ammonia decomposition into hydrogen.
piston reactoron-board ammonia decomposition into hydrogenthermochemical boundary conditions
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