(1. Institute of Seawater Desalination & Multipurpose Utilization, SOA,Tianjin 300192, China) (2.National Engineering Technology and Research Center for Seawater Utilization)
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DOI:
10.7502/j.issn.1674-3962.2013.05.08
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Abstract:
Distillation desalination is one of the most popular processes of desalination, which is to vaporize sea water and condense to obtain potable water. The heat transfer materials cost accounts for 15-22.5% in the total infrastructure of the project. The heat transfer materials using to vaporize sea water is not only in a demand of high corrosion resistance of seawater and heat conductivity but also a reasonable price. The selection of heat transfer materials should compromise between cost, lifetime and heat transfer properties. The suitable selection could reduce the price of the desalination project and the cost of desalination. Copper alloy and titanium alloy are present popular heat transfer materials. Normally, copper alloy tube is used for multi-stage flash distillation, the combination of titanium alloy tube and copper alloy tube for multiple-effect distillation. To develop new heat transfer materials to reduce the cost is one main pursuit of desalination industry. The new aluminum alloy and super steel comparing with traditional materials, the cost is lower with the same product capacity. There is evident that aluminum alloy and super steel will be the popular materials for heat exchangers in future. In this paper, the heat transfer metal materials applying for the distillation desalination, including titanium alloy, copper alloy, aluminum alloy and steel, are summarized. The discussions about corrosion resistance, heat transfer efficiency, cost and application precautions