To solve the problems of high specific energy consumption and excessive harmful ions in the water production of a small reverse osmosis (RO) plant, a desalination system coupling RO and membrane capacitive deionization (MCDI) is proposed in this study. Aiming at producing two cubic meters per day of fresh water with a salt concentration of less than 280 mg L−1, parameter matching optimization was carried out on two desalination system schemes of one-stage two-section RO and one-stage three-section RO coupled with MCDI. The results were compared with the parameter matching optimization results of the one-stage one-section RO and the one-stage two-section pure RO desalination system. The results show that compared with the pure RO desalination mode, the seawater desalination mode coupled with RO and MCDI reduces the specific energy consumption under the same effluent salt concentration. Moreover, it decreases the feed water pressure in front of the RO membrane, which can reduce the standard of high-pressure pump in a small seawater desalination plant. The energy consumption of the one-stage three-section RO and MCDI coupling system is lower than that of the one- stage two-section RO and MCDI coupling system, and the feed water pressure is also lower.
a b s t r a c tSimulation of multiphysics field was carried out for seawater desalination using capacitive deionization (CDI). For the multiphysics field of a CDI unit capacitance electrode, a mathematical model was constructed using transient coupling analysis. The flow field, concentration field, and potential distribution within the CDI electrode were determined, and the pattern of adsorption on the electrode plate and mass transfer process in solution in the CDI unit was studied. In addition, the effects of different voltages, plate spacings, inlet flow rates, inlet concentrations, and porous materials on the adsorption of the CDI unit were investigated. The higher the voltage between the plates, the smaller the plate spacing. A lower inlet flow rate improved the performance of the CDI desalination unit. With all other parameters fixed, the adsorption performance and desalination efficiency of the CDI desalination unit mainly depended on the conductivity and pore structure of the porous electrode materials. When the porous electrode pore parameters and conductivity were fixed, the adsorption and desalination efficiency of the CDI desalination unit remained unchanged. Excellent adsorption and optimal desalination could be achieved using highly conductive porous electrode materials, which possessed a medium hole structure and the maximum surface area.
From the perspective of improving the safety and reliability of ship power pipelines, this paper proposes that the application of sneak analysis in ship power pipelines be divided into two typical situations based on mass flow and energy flow according to the design functions of each subsystem of the ship. Existing sneak analysis based on mass flow may encounter some problems such as incomplete path search and cumbersome analysis process in practical application. An improved method of sneak analysis based on mass flow is emphatically introduced. The improved method is applied in the marine desalination system and compared with the existing method. Results of the comparison show that the improve method can find new sneak problems on the basis of existing method. Thus, the improved method is feasible and effective.
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