Experimental Study On Interfacial Evaporation Based On Janus Membrane Coupled Solar Biaxial Tracking System

The traditional desalination technology is driven by fossil energy,which consumes a lot of fossil energy in the production process and causes environmental pollution.Under the background of "two-carbon",the new type of desalination technology driven by renewable energy is becoming an alternative technology to the traditional desalination technology,and solar-driven interfacial evaporation desalination is becoming one of the most potential alternative technologies with its advantages.However,this technology has been plagued by low steam conversion efficiency and poor stability caused by heat loss and salt crystallization.Therefore,in recent years,researchers have conducted research from the perspectives of heat management,salt crystallization control,and water transport,resulting in significant breakthroughs in solar driven interfacial evaporation seawater desalination technology in terms of photothermal materials,evaporator structure design,and salt crystallization resistance.Based on the experiment,this paper studies the factors affecting the performance of the interfacial evaporation system under outdoor actual conditions.The main research of this paper is as follows:First Prepare a Janus membrane with graphite as the photothermal material and melamine foam as the base,placing the insulation material between the membrane and the water.Use a solar biaxial tracking device and a point-focused Fresnel lens to track the sun.The performance of the above interfacial evaporation system,the influence of environment temperature and irradiation intensity on the system performance were studied,and the influence mechanism of environmental factors on interfacial evaporation was clarified.Secondly,in order to study the effect of thermal insulation materials on the performance of the interfacial evaporation system,the same Janus membrane mentioned above is prepared.The insulation material is not placed between the membrane and the water.The membrane and the water are in direct contact.The solar biaxial tracking device and the point-focused Fresnel lens are used to track the sun in real-time.The performance of the interfacial evaporation system was studied.The performance of the interfacial evaporation system with and without insulation materials was compared with the membrane surface temperature and the water temperature.The influence mechanism of the insulation material on the performance of the interface evaporation system was clarified.Finally,in order to study the influence of photothermal materials on the evaporation performance of the interface evaporation system,a Janus membrane with CNTs as the photothermal material and melamine foam as the base was prepared.The thermal insulation material was placed between the membrane material and the water.A solar biaxial tracking device and a point-focused Fresnel lens were used.The performance of the interfacial evaporation system was studied.Experiments were carried out to compare the performance of the interfacial evaporation device using graphite and CNTs as photothermal materials and the surface temperature of the membrane.To study the influence of the physical properties of photothermal materials on the evaporation performance of the system.