Analysis Of Influencing Factors Of Cathodic Discharge In Liquid

Plasma hydrogen production technology has the characteristics of high yield,low cost,less energy consumption,simple equipment,is the most promising method for development,because the main raw material used in hydrogen production is liquid,so the study of plasma generated by discharge in liquid has very important significance.This topic mainly focuses on the influence factors of cathode discharge in liquid.The main research work is as follows:(1)The equivalent physical model of local discharge of cathode in liquid under DC excitation was established,and the formula of resistance of gas cavity around cathode was deduced from the model,and the thermodynamic model of bubble radius was obtained according to the relationship between bubble expansion radius and joule heat.Combining above chamber resistance model and the maximum bubble radius model,it is concluded that the liquid initial conductivity,liquid parameters such as initial temperature and heating time,bubble maximum radius,gas cavity equivalent resistance,discharge model circuit equivalent relationship among the discharge parameters,such as total resistance,and eventually get the initial liquid conductivity,initial temperature,the relation between the applied voltage and discharge threshold voltage.(2)Selected initial liquid conductivity of different values,the initial temperature and the applied voltage,the use of Matlab software simulation analysis of the condition,the heating time and corresponding maximum radius,gas bubbles cavity equivalent resistance,the change of discharge model of equivalent total resistance curve,and get the initial liquid conductivity in theory,the initial temperature and the relationship between the applied voltage and threshold voltage curve.(3)In the cathode area set the dc excitation,liquid discharge experimental apparatus and experimental verification,by studying the goal to perfect the experimental system and experimental scheme,the design H double electrochemical reactor,a sodium hydroxide prepared different conductivity of ethanol solution,with high precision adjustable water bath heater for water circulation reactor temperature control.Different experimental factors were selected to explore,and electrical and image systems were used to synchronously detect and record the current,voltage and bubble evolution phenomena in each experiment.(4)Based on the experimental data,the curve of current changing with voltage and the threshold voltage change diagram were drawn respectively.Combined with the established theoretical model and the pictures taken during the experiment,the whole process of discharge development was explained,and the reason of threshold voltage change was analyzed.By comparing the experimental results with the theoretical results,it is found that the variation trend of threshold voltage in the experimental group with different initial conductivity and temperature is consistent with the corresponding theoretical analysis results.