基于潮流能直驱式海水淡化系统的建模与仿真

Modeling and simulation of direct-drive system for sea water desalination

提出使用捕能系统捕获潮流能带动低压海水泵把低压海水转换为高压海水进行海水淡化,并对海水淡化过程中的浓海水进行能量回收。潮流能海水淡化关键在于提高效率和进入海水淡化系统时的海水压力的稳定。潮流能海水淡化系统采用直驱方式和能量回收系统提高了潮流能转换效率,而且系统中的高、低压蓄能器对海水淡化过程中海水压力起着稳定的作用。基于线性流体力学理论,推导出潮流能直驱式海水淡化系统的数学模型,模型考虑了水液压系统内部件的滑动摩擦力和泄露量。并对数学模型在系统压力、产水量和产水比能耗等方面进行仿真。仿真结果达到系统压力稳定、产水比能耗低。

It is urgent to study how to use the rich ocean energy for direct-drive water desalination. Using the capture system, we could convert low pressure water into high pressure one with sea water pump for sea water desalination, and we also recover the energy in the process. The key to sea water desalination is improving the converting efficiency and the stability of water pressure. We use the direct-drive method and energy recovery system to achieve the efficiency, and the high and low pressure accumulator helps us stabilize the pressure of the sea water. Based on the linear theory of fluid mechanics, we have derived the mathematical model of desalination system, which takes into account the sliding friction of the hydraulic system and water leaking. And we make the simulation by using the mathematical model of the system pressure, water production and specific energy consumption. Results indicate that the system pressure is stable and specific energy consumption is low.