Research On Key Technology Of Electrolyzed Water Oxygenation For Small Aquatic Living Transport Box

China has abundant aquatic resources.With the improvement of people’s living standards,the quality requirements for aquatic products are getting higher and higher,and the demand for fresh aquatic products and living transportation technology is increasing.In addition,aquatic biological science research also has certain needs for living water biological transportation technology.At present,the methods of living aquatic product transportation mainly include oxygenation transportation,anesthesia transportation and waterless transportation.Among them,oxygenation transportation is mainly based on mechanical oxygenation,its structure is simple,and the cost is low,but the required power is large and bulky,and the noise generated affects the survival of living aquatic products to varying degrees;anesthesia transportation and waterless transportation are implemented.The conditions are high and affect the quality of aquatic products to varying degrees.In view of the above problems,we study the key technologies of living aquatic product transport boxes and electrolytic aeration for high oxygen efficiency,low power,small size and suitable for special conditions.This study studies the electrolysis water aeration method,and designs an electrolysis water aeration experiment device.The device has precise control,strong controllability and small volume,and is suitable for a closed pressure regulating small transport box,which is convenient for operation and transportation.The main research contents and conclusions are as follows:(1)Trial production and experiment of electrolyzed water aeration experimental device.The variable water pump and the chemically stable electrode are selected to design the shape and size of the rectifying device.The rectifying device is composed of a baffle plate and a rectifying plate for rectifying the water discharged from the circulating water pump.In order to verify the effectiveness of the rectifying device,the calculation is performed.Flow simulation of fluid dynamics(CFD)tool is used for simulation analysis,and the size and shape of the rectifier are optimized to achieve an optimal rectification effect.The simulation results show that the baffle is 10 mm away.When the rectifying plate is 20 mm,the rectifying plate has a hole diameter of 1mm,and the baffle has a size of 8mm,the rectifying effect is the best,and in the actual experiment,the rectifying effect of the rectifying device is basically the same as the simulation result.(2)Using the control variable method to conduct the conductance characteristic experiment,under the condition of constant atmospheric pressure,temperature and water quality,the experiment obtained the relationship between voltage and conductance under different flow rates and different dissolved oxygen levels.In order to reduce the power consumption of electrolysis,this experiment defines the continuous overflow bubble on the surface of the electrode plate as “critical state”,and substitutes the “critical state” voltage into the fitted equation to obtain the “critical state” conductance,and further obtain the “critical state”."Control method,through the control system to control the voltage / current and the flow of the circulating water pump,to keep the electrode electrolyzed water in a "critical state",to avoid a large amount of oxygen overflow,to reduce the electrolytic power consumption.(3)Using the control variable method to carry out experiments on oxygenation performance and energy consumption of electrolyzed water aeration device,the variation law of dissolved oxygen degree with time under different flow rates and different voltages is obtained by experiment,and then calculated by data analysis.The variation of energy consumption with time under different flow rates and voltages.In the actual aquatic product transport,the demand for oxygenation in different dissolved oxygen environments is different.This experiment is based on three different phases of external dissolved oxygen environment: first aid phase(dissolved oxygen saturation 35%-60%),insurance In the live phase(dissolved oxygen saturation 60%-80%)and the preservation phase(dissolved oxygen saturation 80%-100%),the three stages have different requirements for oxygenation efficiency and energy consumption,respectively.Summarize the relationship between oxygenation efficiency and energy consumption,and set the optimal combination of control variables for each stage to achieve energy-saving and high-efficiency effectsThe "critical state" control method is obtained by conductivity characteristic test analysis to reduce the loss of electrolytic oxygen enrichment.The optimal control variables and control objects are obtained under different oxygen enrichment requirements through energy consumption test analysis.The test results show that when the water body saturation is from 45% to 100%,the energy consumption is the lowest when the voltage is controlled at 30 V and the flow rate is controlled at 234.24L/H.This paper designs an electrolytic water oxygenation test device.The design method can be applied to live aquatic transport tanks of different sizes,and achieve energy-saving effect under the conditions of ensuring the existence of aquatic products.