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Several Key Problems in the Application of Titanium Tube in Power Station

Edit: Baoji Jinshan Titanium Industry Co.,Ltd    Date: Feb 23, 2017
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Several Key Problems in the Application of Titanium Tube in Power Station


Through a large number of tests and application examples have proved that the condenser in the power plant with titanium, in the technical and economic have great advantages, from an economic point of view, in Japan in 1983, a 1000Mw condenser Of the nuclear power unit with pipe (about 50,000 condensate tube) price, for example, according to the use of condensers for 40 years, aluminum brass average annual leakage lO root, titanium tube in 40 years without leakage. Here to talk about the application of titanium tube in the power station to solve the three problems:

1. Corrosion problem

    Binhai power station condensate with water to do the cooling water. Because the sea water contains a lot of sediment, suspended matter, marine life and a variety of corrosive substances. In the sea water and river water alternately change the situation in the case of more serious. Conventional use of copper alloy tube corrosion methods are: comprehensive corrosion (uniform corrosion), erosion, erosion and stress corrosion. Because titanium has excellent corrosion resistance, so the titanium tube condensers due to corrosion caused by seawater leakage accident has been put an end, but because of the corrosion resistance of titanium tube is good, not like copper alloy tube on the surface of a containing Toxic substances. So the inner wall of the titanium tube is easy to have sea organisms attached to the heat transfer effect, so there must be a corresponding cleaning device.

2. Hydrogen absorption problems 

    Although the titanium surface has a dense passivation film, in many strong corrosive medium is very resistant to corrosion, but because of the great affinity of titanium and hydrogen. Very easy to absorb hydrogen. At room temperature occurs, high temperature (such as 100 ℃) hydrogen absorption quickly. Hydrogen in the titanium in the fixed melting limit is very small (about 20ppm), more than the limit will be in the titanium surface precipitation of hydride (TtH2). With the increase of surface TiH2, the impact value and elongation of titanium are rapidly decreasing [4J. In addition. In the transformation of the old unit, because the tube plate is copper alloy, condenser tube with titanium, which requires the use of cathodic protection device to prevent electrochemical corrosion, such as Hitachi's power plant condenser with seawater cooling, titanium tube and copper alloy plate composition Galvanic, when the protection potential is less than a 0.75 v (ScE) when the export of titanium tube end of hydrogen absorption, the use of hydrogen content of 650 ppm a year; if the potential selection of a 05 ~ O. 75 v (scE), at room temperature titanium does not occur hydrogen absorption "

3. Vibration problem

    As the corrosion resistance of titanium tube is good. Titanium condensers are not damaged by corrosion. But the titanium tube may be damaged due to vibration. To avoid the vibration of the titanium tube, in the manufacture of base titanium condenser, it is necessary to determine the spacing of the partition; in the transformation of the old unit, it is necessary to examine whether the original partition spacing titanium tube.


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