Influencing Factors in Power Generation of Pressure Retarded Osmosis Process

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Abstract

Pressure retarded osmosis (PRO) technology, as an effective method for harvesting energy from the salinity gradients, has shown great potential in the development of new ocean energy. At present, the improvement of power generation efficiency for the PRO is one of the most important issues to be solved. In this paper, the influences of flow direction, solution concentration and flow velocity on the PRO performances were mainly investigated and evaluated in term of the water flux and power density. And results show that it is beneficial to improving the PRO process water flux and power density by applying the counter-current flow mode, raising the concentration difference across the membrane and increasing the flow velocity. What's more, by unilaterally increasing the feed solution concentration, water flux and power density decrease with increasing feed solution concentration; by unilaterally increasing the draw solution concentration, the water flux and power density increase with increasing draw solution concentration. This paper also chooses the river water-forward osmosis brine simulation system and the results indicate that it is more effective to enhance the feed solution flow velocity by using the counter-current mode under the pressure of 1 200 kPa. And when the draw solution flow velocity is 1.0 L·min^-1, the water flux increased by 17.3% as the feed solution flow velocity increased from 0.5 L·min^-1 to 2.0 L·min^-1, and the power density also increased from 8.01 W·m^-2 to 9.39 W·m^-2.

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	Articles by authors
	Liu Yanqiu
	Wang Yue
	Duan Yawei
	Zhang Mengke
	Xu Shichang

Keywords： pressure retarded osmosis； salinity gradient energy； water flux； power density； reverse salt flux

Received 2016-04-27;

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Cite this article:

Liu Yanqiu, Wang Yue, Duan Yawei, Zhang Mengke, Xu Shichang.Influencing Factors in Power Generation of Pressure Retarded Osmosis Process[J] Chemcial Industry and Engineering, 2018,V35(1): 56-62

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