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Shell and tube heat exchanger

Shell and tube heat exchanger

Shell and tube heat exchanger is also called tube and tube heat exchanger. It is a partition type heat exchanger that uses the wall surface of the tube bundle enclosed in the shell as the heat transfer surface. This kind of heat exchanger has a simple structure, low cost, wide circulation section, and easy cleaning of scale; but it has a low heat transfer coefficient and a large area. It can be made of various structural materials (mainly metal materials) and can be used under high temperature and high pressure. It is the most widely used type.

The U-shaped tube heat exchanger is different from the fixed tube plate type and the floating head type. It has only one tube plate. The heat exchange tube is made into a U shape and both ends are fixed on the same tube plate. The tube plate and the shell are fixed by bolts. Together.

Characteristics of U-shaped tube heat exchanger

This kind of heat exchanger has a simple structure and low cost. The tube bundle can be freely expanded and contracted in the shell without temperature difference stress. The tube bundle can also be pulled out for cleaning and saves a tube sheet; however, it is difficult to clean inside the U-shaped tube and the tubes are more expensive.

It is also inconvenient to replace. Since the radius of the U-shaped bend cannot be too small, compared with other shell and tube heat exchangers, there are fewer tubes and the structure is not compact enough.

Shell and tube heat exchanger application scope

U-shaped tube heat exchangers are suitable for situations where the temperature difference between hot and cold fluids is large, and clean, non-fouling high-temperature, high-pressure, and corrosive fluids flow through the tubes.

Material of U-shaped tube heat exchanger

The shell material is carbon steel or stainless steel, and the heat exchange tube material is copper. Customize U-shaped tube heat exchangers with special materials, heat exchange areas and working pressure levels.

The floating coil radiator adopts the form of a cantilevered floating coil. During the process of heating hot water with steam, the up and down floating of the coil causes the water flow around the coil to destroy the laminar heat transfer. The heat transfer capacity is greatly improved, the heat transfer coefficient K ≥ 3000W/㎡℃. At the same time, due to the scouring effect of the water flow, the tube can be cantilevered to float freely and expand and contract freely, so it is not easy to accumulate scale. If a small amount of scale accumulates during long-term use, , through the expansion of the tube, it will be able to automatically remove scale, so the heat exchange capacity will not decrease during long-term use, and the effect will be good.

Shell and tube heat exchanger



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