Multiphysics Field Coupling Calculation Of Hydrogen Production By Microwave Plasma Water Vapor Assisted By Tungsten Electrode

The extensive use of fossil fuels has caused environmental damage and air pollution on a global scale.Hydrogen energy is an emerging alternative to fossil fuels.However,the current production of hydrogen is mainly based on steam reforming and electrolysis technology,and a large amount of fossil fuels are also consumed in the production process.Microwave energy can be used to create plasma due to its high efficiency,cleanness and stability.Plasma can cause water molecules to enter an excited state for dissociation,thereby helping to form an electronic excited state to accelerate the production of hydrogen.Therefore,the microwave plasma hydrogen production method is a new and efficient hydrogen production method that can assist in the production of hydrogen without consuming fossil fuels.This paper uses the multi-physics coupling method to calculate the electromagnetic field and plasma field involved in the process of water vapor hydrogen production,and calculates the electron density,electron temperature,electric field and main products in the process of water vapor hydrogen production: hydrogen,Oxygen,water vapor,by-products: hydrogen peroxide and ozone concentration changes are analyzed.The method has low energy consumption,is clean and does not consume fossil fuels,and produces less by-products that are not enough to constitute environmental pollution.The main content of the paper is as follows:(1)Finite element analysis(FEA)was used to calculate the electromagnetic field and the plasma field in the process of hydrogen production by water vapor,and the transient physical quantities of each field in the process of hydrogen production by microwave plasma water vapor were solved.(2)Analyze the electron density,electron temperature,electric field distribution,hydrogen concentration and the angle of the by-product ozone and hydrogen peroxide in the hydrogen production process through multi-physics coupling calculations.The simulation results found that: a.The electrons originally came from The ionization of the tungsten electrode;b.The hydrogen production rate reaches the maximum when the electron density and the electron temperature reach the maximum respectively;c.The concentration of by-products is much smaller than the concentration of hydrogen,which is not enough to cause environmental pollution.(3)Obtain the optimal hydrogen production conditions of microwave plasma water vapor hydrogen production by improving the electrode type,microwave power and initial temperature,and carry out multi-physics coupling calculations under the optimal hydrogen production conditions,which is compared with the original conditions.The electric field distribution,the concentration of hydrogen and other products and the angle of the by-product ozone and hydrogen peroxide are compared to verify the improvement effect.