The Rig And Experimental Study For Preparation Of Oxygen-enriched Water

Oxygen-enriched water is widely used in food processing,aquaculture,sewage treatment and other fields.In order to satisfy the oxygen-enriched water preparation of low cost,small volume,high oxygen requirements,a efficient oxygen-enriched water preparation device is developed using static spiral cutting thin molecular technology.Moreover,the current method of mechanical stirring,electrolysis,dissolved gas and other oxygen-rich water preparation method,because of its equipment investment costs,complex structure,its production or oxygen-riched level can not even meet the needs of industrial production.Therefore,it is necessary to further study the preparation of oxygen-enriched water technology.Based on the gas-liquid two-phase flow model and computational fluid dynamics,the influence of the static spiral cutter on the gas-liquid two-phase flow in the pipeline was studied by means of simulation.Then,the experiment was carried out to prepare the oxygen-water The factors influencing the oxygen content of oxygen-enriched water were analyzed and the influence of various main factors on the oxygen content of oxygen-enriched water was analyzed.The single factor and orthogonal test were used to optimize the process parameters.The static spiral cutter is made up of thousands of cutting blades according,set as certain helix equation of spiral superposition.Therefore,a space of any two points is discontinuous on space spiral cut surface.When gas-liquid two phase flow in a certain pressure with flowing rate through the cutting chamber,high shear and turbulence on the surface of the bubble cut refinement into micro/nano bubbles(10 microns or less in diameter),so as to realize supersaturation of oxygen dissolved in water.The concrete research content is as follows:1.Analysis of oxygen-enriched water preparation principle and gas-liquid mass transfer characteristics.Based on the theory of gas-liquid mass transfer,the design and calculation of static screw cutter,the analysis of its function,and the design of the filling method,and then design and select other related components,and finally completed the preparation of oxygen-riched water And the theoretical study on the oxygen-enriched performance of the designed prototype is carried out;2.Based on the finite element ANSYS Fluent analysis software,the numerical simulation of the key component-static spiral cutter is carried out by using the computational fluid dynamics method.The static screw cutter is used to analyze the gas-liquid two-phase flow in the pipeline under the variable pressure and variable flow rate Pressure and flow rate,as well as the impact on gas-liquid mass transfer.The shear and turbulence properties of static spiral cutter are theoretically understood;3.The main factors on the oxygen enrichment were studied by single factor tests.The effects of various factors on the dissolved oxygen were analyzed and the influence trend basically tended to increase gradually first,thenincrease with a little changing.The orthogonal experiment design was done on the base of single factor experimental results to obtain the better operation parameters.By poor analysis and variance analysis of various factors on the values of dissolved oxygen,the impact strength sort is: water pressure > oxygen flow rate > water flow rates >oxygen pressure.Through the orthogonal experiment,the optimal process parameters combination for preparation of high oxygen rich water was: oxygen flow rate,0.9 L/min;oxygen pressure,0.2 MPa;water flow rate,0.7 m3/h;water pressure,0.4 MPa.The dissolved oxygen can reach 45.12 mg/L under the best parameter combination,increased by 32.40% compared with that of no optimization;4.The dissolved oxygen enriched by this device under the condition of water can be well preserved by experiment.With the passage of time,oxygen will slightly be lost,but it still have higher levels of dissolved oxygen(more than 20 mg/L),which can meet the requirements in the field of industrial,food fermentation,etc.It proved that the current new type of static spiral cutter can effectively produce small bubbles of micro/nano scale,resulting in high oxygen solubility,low cost by theoretical and experimental research.