Direct Oxygen Enrichment Of Air Based On Electrodialysis Method And Preliminary Exploration

Oxygen-enriched technology is widely used in daily life and industrial production.Oxygen-enriched gas is used in daily life for medical treatment,fruit storage,and providing sterile oxygen enrichment in fermentation.Industrial oxygen is mainly used for oxyfuel combustion.At present,the main oxygen-enriched technologies include membrane oxygen enrichment,cryogenic separation,and pressure swing adsorption,all of which have the disadvantages of large footprint and long startup time.Therefore,based on the traditional electrodialysis solution dehumidification technology,this paper proposes an innovative concept of direct oxygen enrichment method based on electrodialysis.Since this research topic belongs to a new exploration,this paper will combine theoretical research with similar literature.Analyze the construction test device and conduct a series of exploratory experimental studies.The main research contents and results are as follows:Firstly,based on the basic principle of electrodialysis technology,the essence of air ionization,charge and movement are analyzed.The influence of temperature and humidity,output voltage on air ionization coefficient and adhesion coefficient is analyzed by theoretical calculation,and preliminary analysis is based on electrodialysis.The influencing factors of the direct oxygen enrichment method provide a theoretical basis for the construction of the test device.Secondly,a test device for direct oxygen enrichment method based on electrodialysis was built.The experimental results show that under the action of low voltage electric field,the movement of oxygen molecules in the test device is negligible.By reducing the spacing of the electrode mesh,oxygen near the positive electrode net can be found.The concentration was improved,and the feasibility of the oxygen enrichment method was preliminarily verified.To prove that the oxygen enrichment effect in the experiment was not caused by the error caused by the measuring instrument,the oxygen concentration of the positive electrode net and the zero potential network was measured.While the oxygen concentration of the positive electrode network increases,the oxygen concentration of the zero potential network shows a downward trend.The accuracy of the direct oxygen enrichment method based on electrodialysis is preliminarily verified,which provides an experimental basis for further investigation of the influencing factors.Finally,the influence of the electrode grid spacing,temperature and humidity on the oxygen enrichment effect was investigated by changing the electrode grid spacing,temperature and humidity.The experimental results show that the oxygen enrichment effect of the direct oxygen enrichment method based on electrodialysis increases first and then decreases with the increase of the electrode grid spacing.When the grid spacing L=10cm,the oxygen enrichment effect is the best.The oxygen concentration of the positive electrode mesh was increased to 22.3%,which was 7.2% higher than that of the air oxygen concentration,and the peak oxygen concentration of the positive electrode mesh was 21.2% and 20.9% when the electrode mesh spacing L=20 cm and L=5 cm,respectively;At the temperature,the oxygen-enriching effect of the test device,the oxygen concentration near the positive electrode net fluctuated around 22.1%;the oxygenenriched effect of the test device under different humidity was measured,and the oxygen-enriched effect of the device was slightly increased when the ambient humidity was increased.