DYMACHINE Double-pipe Heat Exchanger

Double-pipe heat exchanger is currently the most widely used type of heat exchanger in petrochemical production. It mainly consists of a shell (including inner shell and outer shell), U-shaped elbow tube, packing box, etc. The required pipes can be made of ordinary carbon steel, cast iron, copper, titanium, ceramic glass, etc. The pipe is usually fixed on a bracket. Two different media can flow in the opposite direction (or in the same direction) inside the tube to achieve heat transfer. When conducting reverse heat exchange, hot fluid enters from the upper part, while cold fluid enters from the lower part. Heat is transferred from one fluid to another through the inner tube wall. The distance that a hot fluid flows through from the inlet end to the outlet end is called the tube side; The fluid enters through the connecting pipe of the shell and flows out from one end of the shell to the other. A heat exchanger that transfers heat in this way is called a shell side tube heat exchanger

This type of heat exchanger has several outstanding advantages, so it is still widely used in industrial sectors such as petrochemicals.

① The structure is simple, and the heat transfer area can increase or decrease freely. Because it is composed of standard components, there is no need for additional processing during installation.

② High heat transfer efficiency. It is a pure countercurrent heat exchanger, and suitable cross-sectional dimensions can also be selected to improve fluid velocity and increase the heat transfer coefficient of the fluid on both sides, so its heat transfer effect is good. When conducting liquid liquid heat exchange, the heat transfer coefficient is between 870 and 1750W/(m2 · ℃). This is particularly suitable for heat transfer of fluids with high pressure, low flow rate, and low heat transfer coefficient. The disadvantage of a tubular heat exchanger is its large footprint; The metal consumption per unit heat transfer area is high, about 5 times that of shell and tube heat exchangers; Multiple pipe joints are prone to leakage; High flow resistance.

③ The structure is simple, the work adaptability is large, and the heat transfer area is easy to increase or decrease. Both sides of the fluid can increase the flow rate, so that both sides of the heat transfer surface can have a high heat transfer coefficient. The metal consumption per unit heat transfer surface is large. To increase the heat transfer area and improve the heat transfer effect, various forms of fins can be added to the outer wall of the inner tube, and a scraping film disturbance device can be added to the inner tube to adapt to the heat transfer of high viscosity fluids.

④ The shape can be changed arbitrarily according to the installation position, which is beneficial for installation.