Titanium is called the metal of the 21st century due to its excellent comprehensive properties. Although the price ratio of titanium and titanium alloy bellows to stainless steel bellows is very high (about 10:1), the life of steel equipment is only 2 to 3 years. Titanium bellows The service life of the tube can reach more than 20a, and there is almost no need for repair costs. From the long-term and comprehensive economic benefits, the use of titanium bellows is still very cost-effective. At present, due to cost and manufacturing technology and other reasons, titanium and titanium alloy bellows can only be used in high-tech industries such as aviation, aerospace and high-energy physics in our country, while chemical and oil refining industries are rarely used. It can be expected that with the development of science and technology in our country, the application of titanium will become more and more extensive.
Titanium bellows are generally used in occasions with high-performance requirements, such as lightweight and high flexibility, and also used in fields with high corrosion resistance requirements. Titanium and titanium alloy bellows have broad application prospects in chemical plants such as saltworks, fertilizer plants, and alkali plants. The chemical industry has high requirements for the corrosion resistance of bellows. Stainless steel can no longer meet the actual production needs. The use of titanium and titanium alloy bellows is a development trend. For example, when alkali plants and chemical plants are used for mother liquor heat exchange, due to the high concentration of CL-in the medium, there is corrosion to stainless steel. The use of titanium bellows can effectively prevent corrosion. For example, a chemical plant in the United States used (254mm) hydroformed titanium wave expansion joints in the pipeline for transporting acetic acid; titanium bellows heat exchanger developed by a Beijing company for the salt chemical industry and marine chemical industry has been used in some chemical plants, The use effect is good.
In the oil refining industry, the most used bellows are the wave expansion joint. Bellows expansion joints are widely used in catalytic cracking units in the oil refining industry. The bellows (wave expansion joints) used in the oil refining industry have high requirements for corrosion resistance. The characteristic is that the pipe diameter is large, the bellows are easy to be corroded, and the damaging effect occurs. The main reason is corrosion damage, which accounts for about 80% of the damage loss of the bellows expansion joint. In recent years, with the increase in the content of corrosive media in crude oil, the development of heavy oil catalytic cracking technology, and the increase in the operating temperature of the device, the working conditions of the bellows have become more severe. The corrugated expansion joints in the catalytic cracking unit of an oil refinery often go through a production cycle. Corrosion damage occurs in a few months or even a few hours of operation and needs to be replaced. This seriously affects the safe operation of the equipment and the performance of economic benefits. An urgent problem for each refinery. Therefore, it should be a development trend to use titanium and titanium alloys to replace stainless steel. A Japanese company has used titanium wave expansion joints in the oil refining industry. Various performance experiments have shown satisfactory results, paving the way for practical applications.
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