According to a statement released on Sunday by Arvand’s public
relations office, the locally-built towers – units 41T-21101A/B and
41T-21201A/B – were developed through close collaboration between the company’s
engineering, inspection, and process teams. The equipment is used in units 211
and 212 to remove moisture from chlorine streams, a critical process in
chlorination lines.
The towers operate by absorbing moisture directly using concentrated
sulfuric acid, passing chlorine gas through specially engineered Tunnel Tray
systems. These trays, constructed from corrosion-resistant GRP (Glass
Reinforced Plastic) type C-PVC, were manufactured based on detailed engineering
designs.
The company’s engineering division reported that the new design
eliminates over 85% of the moisture content, significantly enhancing chlorine
purity, reducing equipment corrosion, and limiting the release of process
pollutants. Compared to imported models, the localized version has also cut
construction and procurement lead time by half—from six months to a maximum of
three.
Due to the corrosive nature of chlorine gas and sulfuric acid vapors,
designing such towers requires advanced expertise in materials science and
fluid dynamics. The use of GRP C-PVC instead of metals or unreinforced
polyethylene has improved the towers’ durability under high-pressure and highly
corrosive conditions.
In addition, the optimized Tunnel Tray design reduces pressure drop
and improves gas-liquid contact efficiency, contributing to lower maintenance
costs and improved operational reliability. The localization project was
carried out in partnership with Zagros Composite Kashaf Company.