| With the continuous increase of industrial and agricultural production and domestic water demand,the global freshwater resource consumption situation has become increasingly severe.At present,seawater desalination technology has become one of the ways for many coastal countries to expand water resources.Reverse osmosis desalination technology has become the first choice for small and medium-sized seawater desalination projects due to its short construction period and low equipment investment.In order to solve the requirements for the occupied area and cost of the construction of small seawater desalination facilities such as ships and islands,this paper combines the theoretical basis of plunger pump/motor,and designs a double-row pump-motor booster for reverse osmosis desalination.Pressure energy recovery integrated device.The device pressurizes the seawater in front of the reverse osmosis membrane through the outer ring pump working condition plunger,and recovers the energy of the high-pressure concentrated brine after the reverse osmosis membrane by the inner ring motor working condition plunger to realize the function of pressurization and energy recovery in reverse osmosis seawater desalination.Integration to reduce the electricity consumption of water produced by the reverse osmosis membrane method.This article takes the pump-motor booster energy recovery integrated device as the research object,refers to the existing plunger pump and motor design data,and combines the reverse osmosis seawater desalination process to complete the device structure and component design calculations,and mainly focuses on the double row The force analysis of the type flow distribution pair completed the drawing and assembly of the three-dimensional model of the device.Established various plunger movement and mechanical models,and device input torque characteristics mathematical model,built a hydraulic simulation model of the pumpmotor integrated device through AMESim hydraulic simulation software,analyzed the flow pressure characteristics of the pump-motor device inlet and outlet,and analyzed the device Torque characteristics,leakage of the main friction pair.Analyzed the leakage path of the valve pair of the pump-motor integrated device,and established the water film leakage mathematical model of the double-row valve pair.The leakage amount of the valve pair was calculated and analyzed,and the water film gap was considered by the CFD simulation software pumplinx.The flow field simulation analysis of the device is carried out,the pressure distribution of the internal and external drainage membranes and the leakage flow are analyzed,and the flow pulsation characteristics of the pump and the motor side under the influence of the leakage of the water film gap of the valve pair are analyzed,and the friction of the double-row valve pair is analyzed.The characteristics are analyzed,and the influence of working parameters and valve plate parameters on the friction torque is analyzed.Taking the mechanical balance,lubrication characteristic parameters and leakage flow rate of the dual-row valve pair as the optimization objectives,the particle swarm algorithm is used to optimize the multi-objective optimization problem of the dual-row window valve pair sealing belt under the main constraint conditions.As a result,more parameter selection schemes can be provided for the design of the flow distribution pair.The static structure simulation of the double row distribution plate is carried out by ANSYS software.Under the scheme of the distribution plate with a layer of CFRPEEK cladding on the stainless steel substrate,the strength and deformation requirements of the double row type distribution plate can be met.The influence of the structural parameters on the stress and deformation of the sealing belt is studied by comparing and changing the width of the sealing belt before and after the optimization of the distribution plate.The results show that the deformation and stress can be reduced properly by increasing the width of the sealing belt and reducing the thickness of the cladding layer. |
