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Research and application of composite titanium heat exchanger

It is reported that due to the high extraction cost of titanium, its price is relatively expensive. Although it has the characteristics of light weight and high strength, it is also one of the important factors affecting manufacturing costs in use. Therefore, how to reduce the use of titanium materials has become an important design requirement in product design.

In heat exchangers, embedded tube sheets are an important component, and existing titanium heat exchangers that also serve as flanges have the following shortcomings:

1、 Due to the inability of titanium to weld with other materials, both flanges and tube plates require titanium, resulting in a significant increase in titanium usage.

2、 Due to the significant impact of titanium material thickness on design pressure, as the design pressure increases, the thickness of the flange and tube plate will increase synchronously.

For this reason, researchers have developed an embedded tube titanium heat exchanger that can adapt to different design pressures and can also use a lining ring loop flange structure.

The structure of the three-layer composite tube sheet titanium heat exchanger includes a tube sheet, a distance tube, a pull rod, a nut, anti loosening ears, a support plate, and a U-shaped heat exchange tube. The U-shaped heat exchange tubes are multiple, and the multiple U-shaped heat exchange tubes overlap and pass through the tube sheet. The U-shaped heat exchange tube is fixed to the support plate through the anti loosening ears, and the anti loosening ears are multiple, with multiple anti loosening ears arranged at equal intervals. A distance tube is set between the anti loosening ears, and one end of the pull rod is connected to the tube sheet, The other end passes through a distance tube and an anti loosening support ear, and is compressed with a nut. The tube plate is made of three-layer composite material. There are five anti loosening ears. The anti loosening support ear is fixedly connected to the support plate. A buffer sleeve is set 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. The U-shaped heat exchange tube passes through the tube plate and is welded to the tube plate. TA9+Q345R+TA9 are selected for each layer of the tube plate.

Due to the welding of the U-shaped heat exchange tube through the tube plate and the installation of a buffer sleeve between the U-shaped heat exchange tube and the tube plate, the U-shaped heat exchange tube passes through the tube plate and is then welded. The U-shaped heat exchange tube is welded according to the titanium layer between the material and the tube plate, and the buffer sleeve between the U-shaped heat exchange tube and the tube plate is welded to the middle layer of the tube plate. The thinner the tube plate thickness required under the same strength, the lower the cost, and can be welded freely with other material pipelines.

The new titanium heat exchanger has a simple structure, compact appearance, and convenient use.

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