Development Of Seawater Reciprocating Pump Driven By Oil Hydraulics In Ships

The mainly high-pressure pump currently used in seawater reverse osmosis system are oscillating displacement pump, mulfistage centrifugal pump and high speed centrifugal pump. And the high-pressure pump main dependence on imports, domestle no high-pressure pump applicable to the seawater reverse osmosis currently. This thesis developed a seawater reciprocating pump driven by oil hydraulis suitable for seawater reverse osmosis system, with simple structure, oil-water complete isolation and high efficiency. Analysis and calculation the flow characteristics, and the existing folw pulsation problems are analyzed. The theory analysis and numerical simulation are used, in order to found the main reason of pulsation, the methods to control the pulse and the influence factors of controlling pulse-fluidizing effect.The main content of this thesis:In chapter 1, the background and significance of this thesis is presented. The history and current research progress on seawater reciprocating pump driven by oil hydraulics in Marine seawater desalination equipment are reviewed. Lastly, the main research subjects are presented.In chapter 2, from the reverse osmosis theory for designing the seawater reverse osmosis system, and based on the special requirements of the Marine desalination equipment, developed a seawater reciprocating pump driven by oil hydraulis.In chapter 3, according on the reciprocating pump kinematics analysis, the piston motion and the reciprocating pump flow characteristics, found the reciprocating pump output of flow pulsation. Based on the piston motion rule, obtained the change law of pressure in seawater cylinder, inhaling and exhaling pipeline.In chapter 4, the reciprocating pump flow characteristics were analyzed and calculated, according to the existing problems in flow pulsation,setting an accumulator at outlet of the reciprocating pump to absorb pulsation. Using AMESim software to simulate, the results show that setting accumulator at reciprocating pump outlet can effectively absorb pulse, the main factors affecting its effect is reciprocating pump reversing retention time, air pressure accumulator, volume accumulator and the diameter of pipe between reciprocating pump and the accumulator.At the end, some conclusions in this thesis are summarized and the future research proposals are suggested.