H Finned Tube; Square Finned Tube

What is H-type finned tube?

H-type finned tubes are also called square finned tubes. The H-shaped finned tube is to weld two steel sheets with a circular arc in the middle symmetrically with the light tube to form fins. The front of the fin is shaped like the letter “H”, so it is called H-type finned tube. H-type finned tubes have great effects to recover the waste heat of exhaust gas from power station boilers, industrial boilers, industrial kilns, ship power plants, etc.

How to produce H-type finned tubes?

The fins formed by stamping and shearing of the steel plate are manually coded into the sheet automatic unloading hopper, and the feeding cylinder realizes automatic unloading. At the same time, the steel pipe is transported to the welding position, and the horizontal pushing cylinder pushes the electrode clamping mechanism to realize automatic welding. The electrode clamping mechanism is the key part of the welding machine, and the electrodes on both sides are equipped with material receiving and pneumatic positioning mechanisms. And it is pushed centripetally by the push cylinder, and the fins automatically enter the welding position, clamping and welding, and realize the welding of the fins on both sides and the steel pipe. After the welding is completed, the clamping is released, the finned tube is manually removed, and the steel tube moves forward. The parallel automatic welding of steel pipes and fins can well meet the quality and efficiency requirements of finned tube welding.

H-type finned tube is a heat exchanger element used for waste heat recovery, including base tube and fin group; the base tube has a certain length, and several parallel fin groups are arranged along the axis of the base tube and welded to the outer wall of the base tube ; There is a spoiler rod on the windward side of the fin surface, a spherical convex structure is arranged on the base pipe side at the center of the fin surface, and a small wing vortex generator is arranged on the leeward side of the fin surface; the direction of the flue gas flow does not change, and the ball is arranged The fins of the convex and spoiler rods can change the airflow movement state, aggravate the disturbance, reduce the thickness of the heat stagnation layer, and achieve the purpose of enhancing heat transfer to a certain extent.

H-type finned tube material and size:

H-type finned tube product advantages:

1. The new finned tube welding process is adopted, and the contact of the fin welding part adopts multiple zigzag shapes, so that the fin welding is firm, the welding shape is uniform, the surface is smooth, there is no slag inclusion, pore welding, and the penetration rate reaches 97%.
2. The welding position adopts multiple zigzag methods, which is equivalent to reducing the local stiffness of the finned tube, thereby reducing the amount of compressive plastic deformation generated during the welding process, reducing the longitudinal residual tensile stress near the weld, and also greatly The residual compressive stress of the sheet away from the weld is reduced, so the wave deformation of the sheet is significantly reduced.
3. The penetration rate is 97%, the surface of the weld seam is uniform and smooth without welding bumps, and the expansion of the heating surface can increase the heat transfer coefficient.
4. The extended heating surface unit has a self-cleaning function, which can slow down the deposition, blockage and wear of soot on the heating surface, especially slowing down the wear can ensure a reasonable service life of the heating surface.

Application of H-type finned tube:

H-shaped finned tubes are designed to recover exhaust heat from power plant boilers, industrial boilers, industrial kilns, ship power plants, etc., and effectively improve fuel utilization. The enhanced heat exchange elements are arranged at the tail of the system flue.