Experimental Study And Simulation Of Spray Flash Desalination

Freshwater resources are not inexhaustible.The limited water resources are gradually declining under the massive use and waste of mankind.The serious water shortages have occurred in most parts of our country.The spray evaporation of desalination technology is mainly the use of vacuum technology to improve the evaporation efficiency and saving energy effectively.Conforming to the new trend of technological development.Vacuum technology can make the evaporation of the sea in the relatively low temperature of the evaporation and improve the energy utilization.To achieve the desalination of the sea to improve the production efficiency and energy saving purposes.In this paper,the spray flashing desalination test bed was set up based on the principle of spray flash.The effects of superheat,spray angle and initial pressure on unbalance temperature and flash rate were studied.The main work was as follows:(1)According to the principle of spray flash water desalination,a set of seawater desalination system was set up;(2)Combined with the design of the system,different angle of the conical spray nozzle in different forms of superheat experiments was built;(3)Experiments were carried out at different inlet pressures for nozzles with the same spray angle;(4)Simulation of the conical spray nozzles under different operating conditions and simulated the spray inside the flash chamber.The results show that:(1)When the superheat increases,the flash rate is gradually increased,superheat and flash rate showed a positive correlation.It is possible to improve the flashing rate of the apparatus by appropriately increasing the superheat degree.(2)When the nozzle inlet pressure is constant,when the spray angle of the nozzle increases from 60 degrees to 120 degrees,the average diameter of the fog particles after atomization decreases from 652?m to 582?m and the unbalance temperature difference under the same superheat is constant.The flash rate under the same superheat increases by about 0.15%.So increase the spray angle can increase the flash rate.(3)When the spray angle is constant the inlet pressure of the nozzle increases from 2.73 bar to 3.84 bar,the average diameter of the mist particles is reduced from 652?m to 272?m,and the unbalance temperature difference under the same superheat is obviously reduced.The flash rate at the same superheat is increased by about 0.3%.So that the average diameter of the atomized particles can be reduced by increasing the inlet pressure and the flash rate can be effectively increased.