Development and application of composite titanium heat exchanger

Due to the high extraction cost of titanium, so the price is more expensive, although it has the characteristics of light weight and high strength, but in use is also one of the most important factors affecting the manufacturing cost, so in the product design, how to reduce the use of titanium has become a more important design requirements.

In the heat exchanger, the embedded tube plate is an important component. The existing titanium heat exchanger with the tube plate as a flange has the following shortcomings:

First, due to the characteristics of titanium and other materials can not be welded, flange and tube plate need titanium, therefore, a large increase in the use of titanium.

Second, because the titanium thickness has a greater impact on the design pressure, when the design pressure increases, the thickness of the flange and the tube plate will increase simultaneously.

For this reason, the researchers have developed a type of embedded tube titanium heat exchanger which can adapt to different design pressures and can adopt the structure of lining ring and looping flange.

The structure of the three-layer composite tube-plate titanium heat exchanger comprises tube-plate, fixed distance tube, tie rod, nut, anti-loose support lug, support plate and U-shaped heat exchange tube. U-shaped heat exchange tube has multiple U-shaped heat exchange tubes, and multiple U-shaped heat exchange tubes are overlapped together and pass through the tube plate. U-shaped heat exchange tubes are fixed on the support plate through anti-loose support lugs, and the anti-loose support lugs are arranged at equal spacing and between the anti-loose branches One end of the tie rod is connected to the tube plate, and the other end passes through the distance tube and the anti-loose support lug and is pressed by the nut. The tube plate is made of three-layer composite material. The locking lug has five pieces. The locking support lug and the support plate are fixed connections. A buffer sleeve is arranged between the U-shaped heat exchange tube and the tube plate. The buffer sleeve between the U-shaped heat exchange tube and the tube plate is made of steel. After the U-shaped heat exchange tube passes through the tube plate, the tube plate is welded. Each layer of the tube plate adopts TA9+Q345R+TA9.

Because the U-shaped heat exchange tube is welded with the tube plate after passing through the tube plate, and the buffer sleeve is set between the U-shaped heat exchange tube and the tube plate, the U-shaped heat exchange tube is welded after passing through the tube plate, and the U-shaped heat exchange tube is welded according to the titanium layer of the material and the tube plate, and the buffer sleeve between the U-shaped heat exchange tube and the tube plate is welded with the middle layer of the tube plate, the thickness of the tube plate is thinner under the same strength, and the cost is reduced. And can be welded with other materials at will.

The new titanium heat exchanger has the advantages of simple structure, small appearance and convenient use.