两类能量回收装置的海水淡化工程应用对比

Comparison of Two Types Application of Energy Recovery Devices in Seawater Desalination Projects

转子式压力交换能量回收装置和透平式能量回收装置是目前海水淡化应用较多的两类节能装置,以西沙某岛1000 m^(3)/d海水淡化厂为例,分别采用配置两种能量回收装置的(500×2)m^(3)/d双膜法一级反渗透处理工艺,介绍了海水淡化工程概况和一级反渗透系统工艺方案。系统运行表明:一级反渗透系统回收率为40%和脱盐率不小于99.2%的条件下,采用转子式压力交换能量回收装置和透平式能量回收装置每t产水能耗分别为3.04 kW·h/m^(3)和3.34 kW·h/m^(3),采用透平式能量回收装置的系统结构更为紧凑,设备、管路、阀控元件数量少,操作简便,噪声和振动小。

Rotor-type pressure exchange energy recovery device and turbine-type energy recovery device are energy saving equipment which are commonly used in seawater desalination.The configuration of(500×2)m^(3)/d double membrane reverse osmosis(RO)treatment technology with two types of turbine energy recovery devices is introduced,taking an island in Xisha Islands installed with nissan 1000 m^(3)/d of seawater desalination plant as an example.The system operation shows that under the conditions of primary RO system with a recovery rate of 40%and a desalination rate of not less than 99.2%,the energy consumption per ton of water produced by the rotor-type pressure exchange energy recovery device and the turbine-type energy recovery device are 3.04 kW·h/m^(3)and 3.34 kW·h/m^(3),respectively.However,the system structure using the turbine-type energy recovery device is more compact,and the number of equipment,pipelines,valve control components is less.The operation is more convenient,and the noise and vibration are small.