Dynamics Research And Numerical Simulation Of Positive Displacement Fluid Pressure Energy Recovery Process

The process industry often deals with high pressure fluid;a lot of liquid pressure energy in the process was let out directly. If the energy can be recycled, the considerable operating cost can be saved and higher efficiency can be obtained. Energy recovery of fluid with high pressure has become one of the key factors which decrease specific energy consumption. Therefore, the process industry has been applying fluid energy recovering technology to achieve the best and the most efficient disposition of energy all over the world, In China, the comprehensive pressure and energy utilization industry has already been taken as the key developing field. The research on the comprehensive utilization of fluid energy is so significant that it can bring both social effects and economic returns.The Seawater Reverse Osmosis (SWRO) system and the Synthetic Ammonia (SA) process are the important parts of application field in fluid pressure recovery. A new pressure exchanger device which is manufactured by foreign countries transfers the energy from the concentrate stream directly to the feed stream. This direct, positive displacement approach results in a net transfer efficiency of over 95%. However, our country falls behind the developed countries in these researches. This paper focuses on the technology and equipment of liquid pressure energy recovery and gives analysis and comparison of different types of technologies. Rotary Pressure Exchanger which is based on positive displacement principle is studied in this paper.Combining with the industrial applied instance of Seawater Reverse Osmosis, and employing the theoretical computation research method supplemented by the experiment, the paper makes a deep research on following questions.1. Analyzing the work principle of pressure exchanger and the design principle of rotor and end covers, mainly researching the startup mode and starting process of the Rotary Pressure Exchanger.2. Deciding on the technical parameters and geometric parameters, and building up the calculation model of liquid pressure recovery process.3. Making theoretical computation and numerical simulation on Rotary Pressure Exchanger, mainly analyzing the mixing zone and the inflow liquid length.4. Researching on the mixing and leaking questions of the pressure exchanger, analyzing the effect factors of them, and utilizing CFD method to optimize the whole pressure recovery system.Rotary Pressure Exchanger which is based on positive displacement principle is one of the most advanced technologies in liquid pressure energy recovery field. It is meaningful to make a deep research on Rotary Pressure Exchanger.