Fresh water accounts for about 3% of the earth's water resources. Obtaining new fresh water resources through seawater desalination is a major trend in the world's water use in the future.Among the many methods to solve the problem of fresh water resources in coastal areas, seawater desalination is a practical and effective method. The role of plate heat exchangers is also becoming more important.In foreign countries, the market for titanium plate heat exchangers is extremely impressive. The United States develops titanium plate heat exchangers, titanium condensers, and titanium oil recovery platform titanium evaporators in the fields of offshore oil and gas, natural gas, and desalination.The Delaware refinery in the United States replaced the copper and nickel alloy tubes of all heat exchangers with titanium tubes, with a total length of more than 300 km. The titanium condenser of the desulfurization separation tower has not been corroded for 15 years.
The amount of titanium used to make heat exchangers in Japan in 1999 was 2,100 tons, and it is estimated that it will reach 5,000 tons in 2009.The characteristics of Japanese titanium applications are still civilian. Chemical, electric power and desalination are the main areas of the Japanese titanium market.The MSF type seawater desalination unit with a daily output of 1.3×105 t requires 1500 t of titanium.In the case of corrosion-resistant titanium alloys, SMI-ACE, AKOT, and TiCOREX titanium alloys, which are replaced by Co, Ru, and Ni, are widely used as heat exchangers for power generation, seawater desalination, and salt production.Ti-0.5Ni-0.05Ru, Ti-0.005Pd-0.13Cr, Ti-0.4Ni-0.016Pd-0.025Ru-0.13Cr, and Ti-Ni new corrosion resistant alloys have been introduced to the market. Ti-0.5NI-0.05Ru has been widely used in the manufacture of heat exchangers. Ti-0.05Pd-0.3Co has crevice corrosion resistance and is also used in heat exchangers.
Due to the increasing demand for freshwater in coastal areas and the increase in the use of marine resources in China, and the development and production of large-scale distilled desalination plants (including MSF, ME, VC) will become an emerging industry in China. Desalination of seawater will become the sunrise industry of China in the 21st century.