Introduction
U-tube heat exchanger, also called U-shaped tube heat exchanger, is a kind of Shell And Tube Heat Exchanger, which consists of tube plate, shell, tube bundle and other components.
In the case of the same diameter, U-shaped tube heat exchanger heat transfer area is large; it is simple, compact, high sealing performance, easy maintenance, cleaning, metal consumption at high temperatures, high pressure, low cost; U-shaped tube heat exchanger only a Tube Sheet, good thermal compensation performance, strong pressure-bearing capacity, suitable for high temperature, high pressure operating conditions.
There are various forms of heat exchanger tubes, smooth tube is the traditional form, because it has the advantages of easy manufacturing and low cost per unit length, it is more common in the current application. The tube should be able to withstand a certain temperature difference and stress, and when the tube process and shell process fluid is corrosive, the tube should also have the ability to resist corrosion.
Tube material sources are very wide, there are carbon steel, stainless steel, aluminum, copper, brass and its alloys, copper-nickel alloy, nickel, Chin, graphite, glass, etc. and other special materials. In addition to the heat exchanger tube manufactured by a single material, in order to meet the production requirements, also often use composite tubes.
2、High efficiency heat exchanger tube
In order to simultaneously expand the effective heat transfer area inside and outside the tube or strengthen the heat transfer, to a greater extent to improve the heat transfer coefficient of the tube process, the internal and external surfaces of the heat exchanger tube rolled into a variety of different surface shapes, or the insertion of a disturbance element in the tube, so that the tube inside and outside the fluid turbulence, improve the performance of the heat exchanger tube, has developed a variety of high-efficiency heat exchanger tube. According to the shape of heat exchanger tube and strengthen the heat transfer mechanism, can be divided into surface rough tube, fin tube, self-supporting tube, internal plug-in tube and other types.
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