역삼투압식 해수담수화플랜트용 용적형 에너지회수장치 개발

ERDs(Energy Recovery Devices) helps to lower specific water cost by saving power consumption of the high pressure pumps in SWRO(Seawater Reverse Osmosis) desalination plants thus making the process more efficient and cheaper. This paper introduces a design of directional control valve for the ERD, which can realize high efficiency with the sliding poppet valve type by emans of the ultimate leakage protection in a pressure exchanger. The poppet valves are inherently the best method for leakage protection. And the ERD control valve is designed so that four poppets are controlled simultaneously by a single shaft. It is also designed to ensure the minimization of leakage as well as pressure loss. The pilot scale test(7.2m³/h) successfully showed high efficiency of 97% with this mechanism.