Advantages of titanium in seawater desalination
The early desalination equipment used copper alloy or carbon steel alloy materials, because of the lack of resistance to seawater corrosion, low production efficiency, was soon replaced by excellent corrosion resistance to seawater titanium materials.
1. Wall thickness of titanium tube
The thickness of the heat conduction pipe wall is determined by the use condition of the tube plate material, the construction ability of expanding the pipe, and the welding technology of the pipe end.Due to the small diameter of the heat conduction tube, the strength requirements are not high, so the actual use of the wall thickness of the thin pipe.In general, copper alloy tubes with equal wall thickness of o. 9mm-1.2mm are replaced by titanium tubes. In places where the corrosion is small, thin wall welded tubes with wall thickness of 0.3mm can be used.
2. Thermal conductivity of titanium tube
Due to different materials of heat conduction tubes, thermal conductivity is also different, such as titanium 17W/(m·k), aluminum brass 100W/(m·k),90/10 copper 47w/(m·k), 70/3o copper 29w, (m·k).Therefore, the effect of heat conduction can be controlled by the change of wall thickness.Of the above materials, titanium has the lowest thermal conductivity.Such as the use of thin-wall titanium welded pipe, although the thermal conductivity than aluminum brass poor, but with 90/10 copper is equivalent, better than 70/30 copper.
3. Economy of titanium tube
The price of titanium tube can compete with copper alloy tube.Due to the low density of titanium and the same wall thickness, the weight of titanium tube of the same length is only 50% of that of copper tube.When the wall thickness of titanium pipe is 50% of copper alloy pipe, the quality of titanium pipe with the same heat transfer area is only 1/4 of that of copper alloy pipe. According to the current price level, the overall price of adopting thin-wall titanium welded pipe is the same as that of aluminum copper pipe, which is also cheaper than copper pipe.It can be seen that titanium tube is competitive in price.