In ocean engineering, titanium and titanium alloy materials are used in seawater desalination, oil and ocean drilling, and ocean thermal energy conversion power stations.
1) Seawater desalination.
There are many methods of seawater desalination. At present, evaporation methods are mostly used in the world. Among them, the multi-stage rapid evaporation method (MSF) used accounts for 67%. Because seawater is very corrosive to the tube material under the conditions of high temperature and high flow rate, many tubes, Especially the tubes of the heating part are mostly made of titanium alloy materials (such as titanium tubes).
2) Offshore oil drilling.
On the ocean platform. Grade 9 Ti3Al2.5V Titanium Pipe is used to make condensing pipes and heat exchange pipes, pumps, valves, pipe fittings, etc. of closed-cycle engines; in deep-sea drilling and production of subsea oil, it is used as riser pipes, pre-stressed pipe joints, fixtures and accessories.
3) Ocean thermal energy conversion project.
In an ocean thermal energy conversion power station, the power system, especially the heat exchanger, is the equipment with the highest metal usage rate. Since the overall cycle efficiency is low, the heat exchanger must be large. The design principle of power station system should be long life (up to 30 years) and low maintenance. Therefore, when selecting materials, materials and manufacturing costs and corrosion properties of materials must be considered comprehensively. titanium heat exchanger tube is undoubtedly the most competitive material. In addition, in terms of geothermal energy, titanium is widely used due to its corrosion resistance to sea water, sulfur-containing gases, chlorides, etc., and the advantages of high specific strength.
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