Introduction to brazed spiral finned tubes in steel reinforcement engineering

Introduction to brazed spiral finned tubes in steel reinforcement engineering

The processing of brazed spiral finned tubes is carried out in two steps. Firstly, wrap the steel strip plane perpendicular to the axis of the pipe in a spiral pattern on the outer surface of the pipe, and weld both ends of the steel strip to the steel pipe for fixation. Then, to eliminate the gap at the contact between the steel strip and the steel pipe, weld the steel strip and the steel pipe together using brazing method.

Due to its high cost, this method is often replaced by another method, which involves placing the wrapped steel strip tube into a zinc bath for overall hot-dip galvanizing. Although the overall hot-dip galvanizing solution may not penetrate well into the very small gap between the fins and the steel pipe, a complete galvanized layer is formed on the outer surface of the fins and the outer surface of the steel pipe. The use of integral hot-dip galvanized spiral finned tubes is limited by the thickness of the galvanized layer (when the galvanized layer is thick, the zinc layer is weak and easy to fall off), and the zinc liquid cannot completely penetrate into the gap, so the bonding rate between the fins and the steel pipe is still not high. In addition, the heat transfer coefficient of zinc is smaller than that of steel (about 78% of steel), so its heat transfer capacity is low. Zinc is highly susceptible to corrosion in acids, alkalis, and sulfides, therefore, using galvanized spiral finned tubes is not suitable for making air preheaters (to recover waste heat from boiler flue gas).

High frequency spiral finned tube is an efficient heat transfer element

High frequency spiral finned tube is an efficient heat transfer element. Its heat transfer area is several times to several tens of times that of a light tube, which can enhance heat transfer, reduce flow resistance, reduce metal consumption, and thus improve the economy and operational reliability of heat exchange equipment.

High frequency welded spiral finned tubes are a new type of high-efficiency heat exchange element. It is a high-efficiency heat dissipation component that improves the use of high-frequency welded finned tubes to address the shortcomings of radiators made of series and wound fins. The finned tubes themselves wrap strip steel around the finned tubes and use high-frequency welding technology to weld the fins firmly onto the tubes, ensuring the bonding strength between the tubes and fins. They have high heat transfer efficiency, large heat dissipation area, long service life, wide temperature range adaptability, and high pressure resistance.

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