Design And Regularity Analysis Of Ultrasonic Atomization Multistage Spray Distillation Seawater Desalination System

With the continuous growth of China's population,the demand for freshwater resources is also increasing.The desalination technology plays an increasingly important role as an important means to alleviate the current shortage of freshwater resources.At present,the conventional seawater desalination system has a problem of serious accumulation of scale and low efficiency of desalination.In this paper,a new method of ultrasonic atomization multi-stage spray distillation seawater desalination is proposed in combination with new water treatment technology and traditional seawater desalination technology.Based on the basic principle of spray-evaporation seawater desalination system,an ultrasonic atomization multi-stage spray distillation seawater desalination system scheme was designed,including ultrasonic atomization,vortex flashing and spray flashing seawater desalination process,and ultrasonic atomization was built.Multi-stage spray distillation seawater desalination test platform.In the research of ultrasonic atomization process,the parameters of ultrasonic atomizer affecting seawater atomization rate and particle size were analyzed by the combination of modal simulation and experiment.The ultrasonic frequency was 1.7MHz and the number of atomizers was obtained.Ultrasonic atomization is best when 10 pieces,atomization temperature is 45? and liquid level is 3 cm.In the study of eddy current flashing process,the combination of fluid simulation and experiment method is used to analyze the parameters of the primary vortex tube flash chamber which affect the seawater desalination salinity and seawater ratio as wind speed and length.Firstly,the vortex tube flash chamber model is established,and the flow,velocity and pressure of the internal flow field of the model are analyzed.The relationship between the flow field change and the length of the vortex tube flash chamber is obtained,and then the influence of the flash chamber wind speed and length is designed.The seawater salinity to seawater ratio test obtained the best desalination effect when the wind speed was 5 m/s and the length was 1000 mm.In the study of the spray flash process,the method of fluid simulation and test was combined to analyze the diameter of the spout nozzle of 0.6 mm,the diameter of the core exit of 1.8 mm,the inclination of the swirl groove to 20°,and the number of swirl grooves.At the time,the spray pressure is the main parameter affecting the efficiency of secondary seawater desalination.A two-stage spray flash chamber model was established.The spray pressure was in the range of 0.2 MPa-0.8 MPa,which affected the droplet distribution,droplet velocity and water phase distribution.The spray pressure and spray range,atomization angle and average particle were designed.The test of diameter and fog particle speed obtained the best desalination efficiency of the secondary seawater when the spray pressure was 0.6 MPa.Using the three parameters of the working parameters to optimize the initial design of the seawater desalination system,the optimized seawater produced and the scale accumulation inside the equipment were measured.The results show that the designed ultrasonic atomized multi-stage spray distillation desalination system can obtain fresh water.And the efficiency is that the traditional seawater desalination system is 3 times the amount of salt scale accumulation is 0.2 times.