Case Studies

Issue

Combustion of fossil fuels in cement production led to corrosive off-gases damaging the frames holding the filter bags within 1 year after installation. If the bag drop unit does not function properly, the client is subject to environmental fines.

Goals

Reduce the effects of corrosion on the frames. Root Cause Combustion gases contain SO2 which cools in the upper section of the baghouse and condenses to form H2 SO4

Root Cause

Combustion gases contain SO 2 which cools in the upper section of the bag house and condenses to formH 2 SO 4.

Corrosion inside baghouse.

Preparation

All identified wear zones were HOP water washed All identified wear zones were HOP water washed and neutralised, then grit blasted to Sa 2.5 with a 75 – 125µm (3 – 5 mil) angular profile.

Application

Chesterton® ARC 858 Abrasion Resistant Rebuilding and Faring Composite was used to fare pitted regions and address thin surfaces. Following faring with ARC 858 two coats of Chesterton® ARC SD4i Ceramic-Reinforced Coating were applied at 375 – 500µm (15 – 20 mils).

Severe corrosion at bag frame plate.

Client Reported 

Emergency shutdowns have been significantly decreased and the effects of corrosion have been mitigated. The baghouse dust collector has been in service for 2 years with little corrosion.

Equipment with ARC SD4i applied.

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