Research On Hydrodynamic Of Rotor Of Rotary Pressure Exchanger

Nowadays, the reverse osmosis seawater desalination technology has become the main direction in the field of sea water desalination. As one of the key components of reverse osmosis seawater desalination system, the rotary pressure exchanger plays an important role in energy saving. The device is based on the principle of positive displacement, high pressure concentrated salt seawater and fresh seawater contact directly in the rotor channel and realize the exchange of pressure energy. The structure of this device is simple and it is easy to operate. Without additional energy and control system, the rotor of rotary pressure exchanger can automatically reach the balance, so the energy can be transferred from high pressure to fresh seawater continuously. The self balancing technology is one of the key technologies of rotary pressure exchanger, but public reports on the technical research of this filed are still relatively few, so this paper studies the hydrodynamic of rotor of rotary pressure exchanger. The specific research topics include the following aspects:(1) The relationship between the rotor speed and the performance mainly include mixing ratio and the efficiency of rotary pressure exchanger is analyzed in theory. This work can provide guidelines for the control of the rotor speed of the rotary pressure exchanger.(2) Hydrodynamic mechanism of the rotor rotation driven by the inclined channel of end cover inclined is studied and the idea of control of rotor speed by the design of the angle of flow channel of end cover with the basic shape of the end cover flow channel unchanged is proposed in this paper. A series of flow channel models with different inclined angles were established and CFD simulation was carried out to explore the characteristics of the driving torque of the end cover, which will provides a basic guidance for the control of the rotor speed of t rotary pressure exchanger.(3) A series of gap models with different gap sizes were established, and the simulation was carried out at different speeds to study the characteristics of the rotor resistance with the change of speed and clearance of gap. The research contents and conclusions of this paper can provide some reference for the development of energy recovery devices.