Application of titanium alloy materials in petroleum refining

With the development of industrial modernization, titanium is being widely used as a new metal material. In the petrochemical industry, in general, industrial pure titanium is mainly used to manufacture equipment with high corrosion resistance and high strength; titanium targets, grade 5 titanium round rod molybdenum nickel alloys are used to manufacture equipment used in low oxygen, low pH, and high-temperature chloride environments. Application practice has proved that titanium and titanium alloys are irreplaceable metal structural materials in the development of the petrochemical industry.

Since titanium and titanium alloys have good processing performance and welding performance, they can ensure the manufacturing quality of equipment. Therefore, titanium equipment used in the petrochemical industry has a wide range of materials, mainly titanium plates, titanium strips, titanium tubes, titanium Bars, titanium forgings, castings, titanium composites, etc.

Titanium is an active metal with a strong affinity for oxygen. There is a non-porous and dense oxide film on its surface, which protects the titanium matrix from being corroded in many corrosive media. In the air and any other environment containing moisture and oxygen, when the oxide film is damaged, the titanium surface can immediately form a new film and repair itself. It is precise because of the corrosion resistance of titanium and titanium alloys that titanium can be Completely resistant to corrosion by natural freshwater, semi-alkali water, and saltwater. In the exploitation of sour oil fields and sour gas fields, and in the process of petrochemical production, titanium is highly resistant to a variety of corrosive compounds such as hydrogen sulfide, sulfur dioxide, ammonia, hydrides, alkalis, and various hydrocarbons found in refineries. All have excellent corrosion resistance. In many refineries, titanium heat exchangers have also shown excellent resistance to abrasion corrosion and cavitation in sour water strippers.

Titanium is completely resistant to corrosion by distilled water and fresh water above 260°C. Industrial pure titanium has been successfully used in chloride media above 260°C. In high-temperature seawater, salt water, high-temperature wet chlorine gas and other high-temperature chlorides with higher than normal concentration, titanium-titanium phase nickel alloy or titanium alloy is used in occasions where industrial pure titanium is prone to local crevice or sediment corrosion.

The equipment used in oil extraction and refining is mainly subject to strong corrosion by atmospheric chlorides such as magnesium chloride, sodium chloride, calcium chloride, and hydrogen sulfide, especially the hydrogen chloride formed when the hydrolysis of the compound is present. Corrosive. Therefore, the atmospheric distillation units used in oil refineries, especially the tower top and tower top condensers, oil and gas coolers and other equipment, transport sea water pumps, valves and pipes polluted by sulfide and ammonia, etc., have been used in many refineries at home and abroad. Titanium heat exchangers, titanium pumps, valves, titanium piping replace these equipment traditionally made of carbon steel, BIO, B30 copper-nickel alloy, Monel, etc.

The advantages of titanium heat exchangers are: ① Corrosion resistance, and its service life is expected to be more than 10 years; ② It is not easy to produce scaling, and the heat transfer efficiency is high; ③ It is not easy to leak; Stop phenomenon; ⑤ Reduce the consumption of corrosion inhibitors; ⑥ Reduce the pollution to the labor environment; ⑦ Improve the quality and output of products.