It is reported that due to the high extraction cost of titanium, the price is more expensive. Although it has the characteristics of lightweight and high strength, its use is also one of the most important factors affecting manufacturing costs. Therefore, in product design, how to reduce titanium The amount of material used has become a more important design requirement.
In the heat exchanger, the embedded tube sheet is an important component. The existing titanium heat exchanger with the tube sheet doubled as the flange has the following deficiencies:
1. Due to the fact that titanium and other materials cannot be welded, both flanges and tube sheets require titanium, so the amount of titanium used is greatly increased.
2. Since the thickness of the titanium material has a great influence on the design pressure, when the design pressure increases, the thickness of the flange and the tube sheet will increase synchronously.
For this reason, the researchers have developed an inline tube titanium heat exchanger that can adapt to different design pressures and can adopt a ring loop flange structure.
The structure of the three-layer composite tube-sheet titanium heat exchanger includes tube sheets, spacer tubes, tie rods, nuts, anti-loosening lugs, support plates, U-shaped heat exchange tubes, and there are multiple U-shaped heat exchange tubes. The U-shaped heat exchange tubes are overlapped and pass through the tube plate. The U-shaped heat exchange tubes are fixed on the support plate through the anti-loosening lugs. A distance tube is arranged between the lugs, one end of the tie rod is connected to the tube plate, and the other end passes through the distance tube and the anti-loosening lug, and then is compressed by a nut. The tube plate is made of three-layer composite material. The anti-loose lugs are five pieces. There is a fixed connection between the anti-loosening lug and the support plate. A buffer sleeve is arranged between the U-shaped heat exchange tube and the tube sheet. The buffer sleeve between the U-shaped heat exchange tube and the tube sheet is made of steel. The U-shaped heat exchange tubes pass through the tube sheet and are welded to the tube sheet. TA9+Q345R+TA9 are selected for each layer of the tube sheet respectively.
Since the U-shaped heat exchange tube is welded with the tube plate after passing through the tube plate, and a buffer sleeve is arranged 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 after passing through the tube plate. The U-shaped heat exchange tube is welded with the titanium layer of the tube sheet according to the material, and the buffer sleeve between the U-shaped heat exchange tube and the tube sheet is welded with the middle layer of the tube sheet. Under the same strength, the thinner the tube sheet thickness is, the lower the cost. And it can be welded with other material pipelines at will.
The new titanium heat exchanger is simple in structure, compact in appearance, and easy to use.
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