Views: 0 Author: Site Editor Publish Time: 2026-06-25 Origin: Site
Spiral seamless steel tube boiler coils are helically bent seamless steel tubes designed for cooling/heat recovery in boiler systems. They maximize heat transfer in compact spaces, handle high temperature/pressure, and are a core component of boiler cooling and waste heat recovery units.
Core Definition & Structure
Material: Carbon steel (ASTM A179/A192), alloy steel (ASTM A213), or stainless steel (304/316) — seamless, no weld joints, high pressure resistance.
Shape: Continuous spiral/helical coil (serpentine also common), increasing heat transfer area by 30–50% vs. straight tubes.
Dimensions: OD 19–51 mm, wall thickness 2–10 mm, customizable length; pressure rating 10–50 bar, temp range 200–750°C.
Working Principle in Cooling Systems
Fluid Flow: Cooling water/steam circulates inside the spiral coil; hot flue gas/boiler water flows outside.
Heat Transfer: Spiral turbulence disrupts thermal boundary layers, boosting heat transfer coefficient by 20–40%.
Cooling Effect: Absorbs heat from boiler components (furnace, superheater) or flue gas, lowering temperature and recovering waste heat.
Compact Installation: Long tubing fits in small space, ideal for economizers, reheaters, and cooling jackets.
Key Advantages
High Efficiency: Large heat transfer area + turbulent flow → lower fuel consumption.
Safety & Reliability: Seamless tube → no leakage; withstands high pressure/temperature; reduces fouling.
Space Saving: Spiral design cuts installation space by 40–60% vs. straight tubes.
Cost Effective: Long service life, low maintenance, improves overall boiler efficiency.
Main Applications
Boiler Cooling Jackets: Cool furnace walls and pressure components.
Economizers: Preheat feedwater with flue gas waste heat.
Superheaters/Reheaters: Control steam temperature for turbines.
Waste Heat Recovery: Capture exhaust heat for secondary use.
