Design And Performance Simulation Study Of Hydrogen Production And Mixing System Of Onboard Electrolysis Water

Traditional fuel vehicles not only consume a large amount of non-renewable energy,but also pollute the environment.Therefore,it is urgent to develop new clean energy to replace traditional fossil energy.Hydrogen has become a research hotspot in the field of clean energy for vehicles because of its high calorific value,wide source and pollution-free combustion products.Hydrogen production by electrolysis of water is green and environment friendly,it also with great potential for development and application.The most important part of the electrolytic water hydrogen production device is its catalytic electrode.Compared with the platinum catalytic electrode material which is widely used at present,the novel catalytic electrode based on non-precious metals can improve the efficiency and reduce the cost of the hydrogen production.The extensive use of hydrogen energy in automobiles is also faced with the problems in onboard hydrogen storage,hydrogenation infrastructure and other issues.In view of the above problems,this paper designs a onboard hydrogen production and mixing system and puts forward a working mode of engine hydrogen-mixing combustion.In this paper,the nanometer array catalytic electrode based on transition metal phosphide was prepared at first,and the electrolysis water hydrogen production device was assembled with this electrode as the core.Then,a new on-board hydrogen production and mixing system was designed by combining the device with the traditional fuel engine,and the working mode of hydrogen mixing combustion of fuel engine was proposed.Finally,the combustion process of the hydrogen-doped engine and the dynamic performance of the vehicle were simulated by AVL Boost and AVL Cruise simulation software.The results show that the system can improve the combustion condition of the engine and improve the dynamic performance of the vehicle effectively.Specific research contents are as follows:（1）Firstly,two kinds of transition metal phosphide nanoarray catalytic electrodes were prepared by the synthesis method of hydrothermal and high temperature phosphating,then their physical properties and electrolysis water catalytic performance were studied and analyzed in detail by SEM,EDS,XRD and electrochemical testing methods.The results show that the electrolysis water hydrogen production device based on Ni₂P/NF fractional nanostructure catalytic electrode has excellent performance,and the current density of 10 m A cm^-2 reach at1.58 V only.（2）Then,with the comprehensive consideration of the vehicle’s structure,vehicle’s common working conditions,the cost of the system and other factors,the vehicle electrolysis water hydrogen production and mixing hydrogen combustion system is designed.The system is combined the electrolysis water hydrogen production device mentioned above with the traditional engine,its main components including the water storage tank,electrolytic cells,filters.with these components work together,hydrogen produced by the electrolysis of water can be directly injected into the engine cylinder with gasoline mixed burning,effectively resolve problems that the current hydrogen production cost is high,the car with high pressure hydrogen storage is dangerous,hydrogenation infrastructure is imperfect and so on.（3）Finally,the engine combustion process and vehicle dynamic performance of the on-board hydrogen production and mixing system were simulated by AVL Boost software and AVL Cruise software respectively.The results show that the power performance,fuel economy and emission performance of the engine equipped with the on-board hydrogen production and mixing system are improved,and the power performance of the vehicle is also improved to a certain extent.It provides a new idea and a new direction for the application of hydrogen energy in the traditional automobile.