Potential for Seawater Desalination in Singapore Using LNG Regasification as a Heat Sink
By Shaik Salim, Ooi Thomas Ho, and Pehkonen Simo
Water supply diversification is a crucial issue in Singapore. With a limited number of catchment areas, limited land, and a growing economy, it is important to ensure the security of the water supply. By 2012, Singapore is planning to have an LNG terminal with the capability to receive imported LNG by shipping vessels. LNG exists in a liquefied form and must be regasified before it can be used. However, significant energy is wasted to regasify the LNG. This paper discusses the potential of using the regasification process as a heat sink to desalinate seawater (i.e., with a typical salinity of 3.5%). Seawater is taken below its initial freezing point to produce an ice and salt solution mixture. The ice is then separated from the brine and melted to produce nearly salt-free water.
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