Principle, structure and optimization of piston type energy recovery device: a comprehensive review by designer

摘要

With the continuous development and the diversified applications of membrane desalination technology, goals such as lower energy consumption, higher efficiency, more flexible parallel combination forms and miniaturization have been presented for the piston type energy recovery device (ERD). To reach the above goals, this article will analyze the optimization direction of piston type ERD from the perspective of design and application. First, it is to study the function of the reduced drive energy consumption on improving the energy recovery ratio; second, it is to introduce the function of optimized signal control mode and time control mode on the ERDs' operational stability and flexibility and to analyze the optimal parallel combination form of double-cylinder and single-cylinder piston type ERDs; finally, it is to evaluate the feasibility of the miniaturization design about piston type ERD and to introduce the operating characteristics of miniaturized piston type ERD coupled in seawater desalination system.