Economisers, air preheaters, condensers and HRSG modules all rely on finned tubes that survive high temperature, ash and soot-blower erosion for decades.
Boiler and HRSG applications
- Economisers — HF welded spiral fins on carbon or alloy steel, with pitches chosen to avoid ash bridging.
- Air preheaters — double-H and studded tubes for flue gas with high dust load.
- HRSG modules — finned tubes in evaporator, superheater and economiser sections.
- Air-cooled condensers — large-diameter welded fin tubes for steam condensation.
Design considerations
Thermal power stations operate fin tubes at metal temperatures that rule out aluminium fins. Carbon steel, ND steel and alloy steel fins are welded directly to the base tube, and the fin thickness is selected against the erosion rate from the ash and the soot blowers. A 1.5 mm fin in a coal-fired economiser is not over-specified — it is the difference between a fifteen-year life and a five-year one.
| Section | Fin type | Material | Typical temperature |
|---|---|---|---|
| Economiser (coal) | HF welded, serrated optional | Carbon / ND steel | 300–450 °C |
| Superheater support | HF welded | T11 / T22 / T91 | 450–600 °C |
| Air preheater | Double-H, studded | Carbon / enameled | 150–350 °C |
| ACC | HF welded or integral | Carbon steel / stainless | 60–120 °C |
Send your boiler tube specification
Tell us the tube diameter, fin height, fin pitch, materials and quantity — we reply with price and lead time within one working day.