Boiler Evaporator Spiral Finned Tubes are crucial components for heat exchange in boiler systems. Their structure consists of a metal base tube with spiral fins wound around it.

The base tube is typically made of high-temperature and corrosion-resistant alloy steel, capable of withstanding the high temperature and pressure environment within the boiler. The spiral fins are precisely fitted to the base tube. Compared to ordinary fins, the spiral design further optimizes the fin distribution density, expanding the heat exchange area within a limited space. This lays the foundation for efficient heat transfer and helps the boiler evaporator better complete the evaporation process of the working fluid.

Spiral finned tubes in boiler evaporators are highly efficient heat transfer elements. The spiral fin structure significantly expands the heat transfer area, improving thermal energy conversion efficiency. Its core advantages include:

Enhanced Heat Transfer: The finned design increases the heat transfer area by 3-8 times that of a bare tube, and reduces thermal resistance through turbulence, improving the heat transfer coefficient by 40%-60%;

High-Temperature Resistance: Utilizing carbon steel, alloy steel, or nickel-based materials, it can withstand working environments of 300-1200℃. Surface treatment technologies (such as hot-dip galvanizing) enhance corrosion resistance;

Compact Structure: Reduces equipment size, suitable for quick-assembly boilers, while lowering operating costs and metal consumption.

Boiler Evaporator Spiral Finned Tube Manufacturing Process

High-Frequency Resistance Welding: Welding the fins and base tube using the thermal effect of electric current;

Bragging: Achieving connection using low-melting-point filler metal, preventing the base tube from melting;

Integral Forming: Hot rolling process integrates the fins and base tube, extending service life by more than 3 times.

Applications of Spiral Finned Tubes in Boiler Evaporators

Primarily used in boiler economizers, air preheaters, and waste heat recovery systems.

In terms of heat exchange performance, spiral finned tubes in boiler evaporators offer excellent heat transfer efficiency. When high-temperature flue gas or heat transfer medium flows through the gap between the fins and the base tube, the spiral fins quickly capture heat and transfer it to the interior of the base tube. The working fluid inside the base tube absorbs the heat, accelerating the evaporation rate.

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The spiral structure also guides fluid flow to a certain extent, reducing fluid stagnation, lowering thermal resistance, and allowing for more complete heat exchange. This helps improve the overall operating efficiency of the boiler evaporator and meets the system’s heat exchange requirements.

Spiral finned tubes are suitable for various types of industrial boiler evaporators, such as coal-fired and gas-fired boilers. Their installation must be integrated with the overall structure and spatial layout of the boiler evaporator to ensure coordinated operation with other components.

During daily use, due to prolonged contact with high-temperature fluids, it is necessary to regularly check the fit between the fins and the base tube for corrosion, deformation, or other problems. Timely maintenance is crucial to ensure continuous and stable heat exchange and extend service life.