Simulation And Parameter Optimization Of Flotation Water Purification System Of High Pressure Jet Dissolved Air

Based on the traditional method of ejector after pump pressurized dissolved air, thearticle made the high pressure roto-jet pump (pump pressure:6MPa~10MPa) replacethe ordinary centrifugal pump (pump pressure:0.3MPa~0.6MPa)，and combinedroto-jet pump with ejector to constitute high-pressure jet dissolved air system; Throughtheoretical analysis and system simulation，researched on the pressurized ability ofroto-jet pump and the simulation optimization of the structural parameter of ejector;Explored theoretically how to improve the rate of dissolved gas of the method of ejectorafter pump pressurized dissolved air, to improve the quality of the generated bubbles,and to reduce energy consumption and operating costs of the dissolved air, so as toobtain a theoretical basis for utility design of the systemFirstly, to analysis the impact of the four parameters on roto-jet pump outletpressure, the mathematical model of roto-jet pump outlet pressure was established, thenthe relationship between pump speed, impeller outside diameter, the inlet and outletdiameter of flow concentration pipe and pump outlet pressure was drawed by Mathcadsoftware, finally, it is concluded that roto-jet pump is applied to high-pressure jetdissolved air system is feasible.Secondly, simulation analyzed and compared the differences between high pressurejet dissolved air and low pressure jet dissolved air by means of CFD and Fluentsoftware, identified the advantages of the high-pressure jet dissolved air，and it isconclusion that the higher high-pressure efficiency of jet dissolved air is available whenoutlet pressure is0.6MPa, inlet1pressure range from6MPa to10MPa; simulated thestructural parameters of the ejector that may influence the effect of high-pressure jetdissolved air, according to the magnitude of the outlet rate of gas and the state of rate ofgas in throat pipe and diffusion tube of ejector, simulation results that were under thevarious different parameters values were compared analyzed, and obtained structural parameters of the ejector in the optimal jet condition.