Case Studies

Heat Exchanger Four-Coat Spray Application

Power & EnergyFinned-tube air preheater / heat exchanger

Project background

The documented four-coat spray application used to build the specified anti-corrosion film.

Industry: Power & Energy
Equipment: Finned-tube air preheater / heat exchanger
Substrate: Carbon steel
Operating environment: Water-bearing flue gas containing SO₂, SO₃, NOx, HCl and particulates
Operating temperature: Long-term service ≤150°C; project equipment table records 140-180°C

Acid-condensation corrosion combined with high-velocity particulate erosion on the heat-transfer tubes.

Create the recorded Sa 2.5 and 25-40 μm prepared surface, then apply the specified anti-corrosion coating in four spray coats.

ZM desulfurization heat-exchanger anti-corrosion coating

Abrasive blasting to Sa 2.5 with 25-40 μm roughness, followed by four spray coats to the specified build.

Inspection recorded the design coating thickness, a uniform film and colour, no wrinkling or agglomeration, and a compliant construction result.

Inspection confirmed the specified film build and a uniform coating without the recorded visual defects.

DAYU-X

Share the equipment, substrate, temperature, medium and current failure mode for a project-specific review.