盐差能发电技术的研究进展

盐差能是一种新型的可再生的海洋能,主要存在于河流入海口处。目前提取盐差能主要有3种方法:渗透压能法(PRO)——利用淡水与盐水之间的渗透压力差为动力,推动水轮机发电;反电渗析法(RED)——用阴阳离子渗透膜将浓、淡盐水隔开,利用阴阳离子的定向渗透在整个溶液中产生的电流;蒸汽压能法(VPD)——利用淡水与盐水之间蒸汽压差为动力,推动风扇发电。渗透压能法和反电渗析法有很好的发展前景,目前面临的主要问题是设备投资成本高,装置能效低。蒸汽压能法装置太过庞大、昂贵,这种方法还停留在研究阶段。

Progress in extracting power from salinity gradient

Salinity gradient energy is a new type of renewable ocean energy which mainly exists in entrances of rivers flowing into the sea. At present, there are three methods to extract power from salinity gradient: Pressure Retarded Osmotic (PRO)-It utilizes the osmotic pressure difference between fresh water and sea water to drive a water turbine to produce electrical energy; Reverse Electrodialysis (RED)-Electricity can be produced directly by mixing sea water and diluted water which are separated by cation membr...