The heat exchange effect of the titanium heat exchanger has a great relationship with the material and process characteristics of the heat exchanger. During the concentration process of materials, solutes or impurities often deposit and crystallize on the heating surface to form a scale layer, which affects heat transfer; some solutes are heat-sensitive, and stay at high temperature for too long and are easy to deteriorate; some materials are more corrosive. or higher viscosity, etc. Compared with the above-mentioned various expanding tube technologies, the explosive welding forming process has the following outstanding advantages:
(1) Since explosive welding is a special pressure welding, it can realize the welding between zirconium and titanium pipes and steel and other special-shaped metals that cannot be achieved by conventional welding and pipe expansion methods;
(2) Since the explosive welding interface belongs to the solid phase combination between atoms, the welding strength between the heat exchange tube and the tube sheet of the heat exchanger is high, which not only ensures the safety of the heat exchanger, but also greatly improves the heat exchanger. service life;
(3) Since explosive welding can achieve multi-point simultaneous detonation, the productivity is high, and the welding and forming of all tubes and tube sheets of a heat exchanger can be realized at one time.
The titanium heat exchanger is made of high-quality titanium tubes. In terms of physical properties, titanium tubes have many advantages such as light weight and superior mechanical properties. The strength of titanium is high, and the tensile strength of pure titanium can reach up to 180kg/mm2. Some steels are stronger than titanium alloys, but the specific strength (ratio of tensile strength to density) of titanium alloys exceeds that of high-quality steels. In addition, titanium alloys have good thermal strength, low temperature toughness and fracture toughness. Industrial pure titanium can be widely used in organic compounds, alkaline solutions, salt solutions and other media, and it is not easy to react with them, and has excellent corrosion resistance; pure titanium has low concentration of hydrochloric acid, sulfuric acid, nitric acid and other inorganic acids at room temperature. Good corrosion resistance; but with the increase of medium concentration and working temperature, industrial pure titanium is easy to chemically react with the above inorganic acids, which reduces the corrosion resistance of titanium. Therefore, during the heat exchange process, attention should be paid to the concentration of the medium and the Operating temperature.
