Welded finned tube
We produce laser welded finned tubes and high-frequency welding finned tubes. And it is widely used for civil wall-hung boilers, industrial boilers, etc.
There are many types of finned tubes. Although high-frequency welding finned tubes are more advanced in terms of product quality and production automation compared with inlay and brazing methods. Due to its factors such as difficulty in welding the root and wrinkles at the root cause many shortcomings in heat exchange efficiency and fouling prevention. By comparison, the laser-welded finned tube is the most advanced product of irreplaceable advantages. It has a high penetration rate, can prevent crevice corrosion, prolong service life and reduce heat transfer resistance. Breaking through material restrictions. And it can use different materials for processing, saving material costs, and easy for secondary processing.
The disadvantage of laser welding is that the processing time is longer and the output will be limited. Therefore, we still maintain a high-frequency welding production line, which can provide fast and large numbers of finned tubes with low cost, and still has a high market share in general industrial applications.
Spiral welded finned tubes are one of the most common types of finned tubes. By spirally winding the fins on the base tube and welding at the bottom of the fins, The connection between the fin and the base tube is very tight, which can prevent the fin from loosening due to thermal stress, oxidation, corrosion, etc., so it can be used at very high temperatures.
Its structure is the same as the spiral fin tube, but its fin material is serrated, which further increases the heat dissipation area of the fin and improves the heat dissipation efficiency. It is suitable for use as a heat transfer element for a horizontal shell and tube condenser. Compared with general low-fin tubes, the structural characteristics of this tube are: the fins are dense; the fin distance can be as small as 0.5mm, and the outer edge of the fins There are sawtooth-shaped notches on the upper part. In contrast to the low-rib tube, the sides of the fin are rough instead of smooth.
The effect of the H-shaped fin structure on dust accumulation and wear: The gap between the two fins uses the flow of smoke and the erosion of the dust because the smoke has a higher flow rate at the gap; the pipes are arranged in a line, and the resistance Small wear and small wear; H-shaped fins can effectively use the flow space and maintain a large fin area and fin ratio; the thickness of the fins can be arbitrarily selected according to the needs of anti-wear; the fins are parallel and independent of each other, and there is no helix angle The influence of ash, thus facilitating the removal of ash.
Double S Type
Two round tubes can share a set of fins, called HH finned tubes. On the one hand, the double H fin tubes can expand the heating surface to increase the heat transfer coefficient, and the extended heating surface unit has a self-cleaning function, which can slow down the deposition, blockage, and abrasion of smoke and dust on the heating surface. On the other hand, the H fins bending deformation, twisting deformation, and wave deformation of the sheet have been effectively controlled. Ensure the reasonable service life of the heating surface, and ensure the safe and economical operation of the waste heat boiler.
Steel studs are welded by a special process onto the base tube. it calls studded tubes.
In the petrochemical industry, nail-head pipes are widely used. Especially in the convection chamber of the tube heating furnace, in order to enhance the heat exchange effect outside the tube, the heat transfer element often uses a nail-head tube.
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