Titanium has good stability in highly corrosive hot water containing chlorides and sulfides, and is widely used in thermal power plant heat exchanger cooling tube. Thin-walled titanium tube to replace the copper-nickel alloy tube, not only greatly improve the service life, and maintenance time is also greatly reduced, the economic benefits are significant.
Titanium and titanium alloys have good corrosion resistance and can also be used for steel chimney lining. Adopted without GGH and bypass seawater desulfurization system, titanium plate used as a wet chimney steel chimney corrosion lining.
Industrially pure titanium is a thermodynamically unstable metal. The standard electrode potential for titanium ionization is -1.63 V if Ti2+ can be produced by dissolution, which makes titanium soluble in water and releases hydrogen. However, titanium is highly resistant to corrosion in a variety of corrosive media because it is highly passivated. Its passivation exceeds that of cobalt, nickel and stainless steel. It has excellent corrosion resistance in many reactive media, especially oxidizing media and chloride media, but titanium is less stable in sulfuric and hydrochloric acids. In order to solve the problem of poor corrosion resistance of conventional titanium and titanium alloys to reducing media such as sulfuric acid and hydrochloric acid, the addition of molybdenum (10%~32%) to titanium alloys can greatly improve the corrosion resistance of titanium alloys to reducing media. The higher the molybdenum content, the better the corrosion resistance, but the more difficult the smelting and processing. Strengthening of the alloy is its main property and has a certain influence on its application. Titanium-molybdenum alloys are more suitable for corrosion protection of steel chimneys than pure titanium. ti-20MO and above Ti-Mo alloys can meet the requirements and are particularly suitable for power plants using seawater desulphurization due to their strong resistance to chlorides. The higher the molybdenum content, the better the corrosion resistance, but the more difficult the smelting and processing. The main performance is the strengthening of the alloy, which affects the application of the alloy to a certain extent.The corrosion resistance of Ti-Mo alloy is shown in Table 2. Titanium-molybdenum alloys are more suitable for corrosion protection of steel chimneys than pure titanium. titanium-molybdenum alloys of Ti-20MO and above can meet the requirements and, because of their strong resistance to chlorides, they are particularly suitable for power plants using seawater desulphurization. The higher the molybdenum content, the better the corrosion resistance, but the more difficult the smelting and processing. The main property is the strengthening of the alloy, which to some extent affects the application of the alloy.The corrosion resistance of Ti-Mo alloys is shown in Table 2. Titanium-molybdenum alloys are more suitable than pure titanium for corrosion protection of steel chimneys. titanium-molybdenum alloys of Ti-20MO and above can meet the requirements and, because of their strong resistance to chlorides, are particularly suitable for power plants using seawater desulphurization. the corrosion resistance of Ti-Mo alloys is shown in Table 2. Ti-Mo alloys are more suitable than pure titanium for corrosion protection of steel chimneys.Ti-20MO and above meet the requirements and are particularly suitable for power plants using seawater desulphurization due to their strong resistance to chlorides. Titanium-molybdenum alloys are more suitable than pure titanium for corrosion protection of steel chimneys. ti-20MO and above Ti-Mo alloys can meet the requirements and are particularly suitable for power plants using seawater desulphurization due to their strong resistance to chlorides.
Titanium coils are used for condensers in coastal power stations. Aluminum brass tubes or B30 white brass tubes were used before the 1960s. With the increase of seawater pollution, the service life was greatly reduced. All titanium condensers were used in the UK as early as the 1960s. thin-walled (0.3-0.5mm) welded titanium tube condensers were introduced in Japan in the 1970s at a much reduced cost. titanium condensers were used in 30% of developed countries by 1987. The use of titanium condensers is emphasized due to the high requirements for safe operation and reliability of nuclear power plants. Most of them use thin-walled welded titanium tubes and seamless titanium tubes. China has been testing domestic titanium tubes since the late 1970s. Since 1983, 18 all-titanium condensers have been used in nine power plants, including Zhejiang Taizhou Power Plant, Shanghai Jinshan Thermal Power Plant and Zhejiang Zhenhai Power Plant. They share 700 tons of titanium tubes. The results were satisfactory.
