The stainless steel corrugated heat exchange tube is a new type of high-efficiency heat exchange tube that replaces the normal straight tube. It has the advantages of strong corrosion resistance, longer life, no pitting corrosion, and low price.
The plain tube is whether welded tube or seamless tube, it can be fabricated with corrugated surface. But considering cost problem, most of our customers prefer welded stainless steel tube with corrugated surface.
Corrugated tube, also known as low-ribbed pipe, is mainly used to expand the heat transfer area by ribbing the outside of the pipe (the ribbing coefficient is 2-3). It is generally used in occasions where the heat transfer coefficient inside the pipe is more than twice that of the heat transfer coefficient outside the pipe. For condensation and boiling outside the tube, due to the effect of surface tension, it has a better strengthening effect. The combination of threaded tubes and baffle rods can not only eliminate the vibration problem of the heat exchange tubes, but also increase the coefficient of the cross-flow heat exchanger by about 30% compared with the bow-shaped baffles, and reduce the pressure drop of the tube bundle by 50%.
Characteristics of heat exchanger corrugated tube
High heat transfer coefficient of heat exchanger corrugated tube
The heat transfer coefficient is an important technical index of heat exchange equipment, and strengthening the convective heat transfer on the heat transfer surface is an effective measure to improve the heat transfer coefficient. The enhanced heat transfer of the corrugated tube heat exchanger is realized through its unique ultra-thin-walled corrugated tube. The height difference between the troughs causes the fluid to be strongly disturbed. This disturbance comes from the three-dimensional movement of the fluid inside and outside the tube, so the degree of disturbance is more intense and thorough. Even if the fluid velocity is very low, it can also make it a turbulent state. The thin wall has a small temperature gradient, which greatly reduces the thermal resistance of the tube wall and improves the heat transfer coefficient inside and outside the tube, thereby increasing the overall heat transfer coefficient. Generally, for water-water heat transfer, it can reach 1500-3500Kcal/㎡.h.℃, and for steam-water, it can reach 2500-5000 Kcal/㎡.h.℃. times.
High temperature resistance, can withstand large temperature difference and pressure difference
Although the wall of the corrugated tube is very thin (0.5-0.8mm), because it adopts a special free forming process and a unique arc shape, its pressure bearing capacity is greatly improved. The unidirectional failure pressure of the corrugated tube measured in the laboratory is average It is about 20Mpa, and it is safe to control the pressure below 6.4Mpa during actual use. At the same time, the corrugated tube heat exchanger is made of stainless steel, which can adapt to a higher working temperature, up to 450 ° C, and the bellows is a flexible component with a certain thermal compensation capability, and has good adaptability to large working temperature differences. , The thermal stress of the equipment is small, which has obvious advantages compared with ordinary tubes.
Strong anti-scaling and descaling functions
Scaling, corrosion, and clogging of heat exchangers have always been difficult problems to solve, especially when the water quality is poor, the water treatment effect is not good, the gas medium contains impurities or the chemical reaction is easy to generate scaling. particularly prominent. In light cases, the function of the heat exchanger is reduced, the working conditions are deteriorated, the resistance is increased, and the energy consumption is increased.
The stainless steel corrugated tube of the corrugated tube heat exchanger is made of high-quality stainless steel material, which is anti-corrosion. What is more important is the special inner and outer waveforms of the corrugated tube. The turbulent medium continuously scours the inner and outer surfaces of the heat exchange tube, and dirt is difficult Even if fouling is deposited on the surface, since the corrugated tube is a flexible element, the curvature of each part of the corrugated tube will continue to change after being affected by the temperature difference during the working process, although the deformation caused by this curvature change is not It is very large, but the linear expansion coefficient of the dirt and the metal corrugated tube is very different, so there will be a large pull-off force between the dirt and the surface of the corrugated tube, which is enough to make the scale fall off to realize automatic cleaning and descaling, especially for this One point is unmatched by tube and other heat exchangers.
Uniform stress distribution and strong corrosion resistance
Because the corrugated tube adopts a unique forming process, that is, "free forming" or "soft forming". The characteristics of this process are: in the forming process, the deformation is not formed due to the forced flow of metal in the mold, but a free flowing process or called "soft forming" process. Since there is no forced deformation in this forming process, It will not cause stress concentration, the residual stress is small, the stress distribution is uniform, and there is no intergranular defect, so it has a strong resistance to stress corrosion.
Long service life and reasonable price
Since the corrugated tube is made of ultra-thin-wall stainless steel, on the one hand, the service life of the product is improved, and at the same time, the weight of the product is greatly reduced, and materials are saved. Moreover, due to the reduction of operation and maintenance costs and the reduction of the occupied area, the The performance-price ratio of the product is greatly improved, and the economic benefit is obvious.
