The customer selected an Envitech packed bed scrubber. The scope of supply includes a fiber reinforced plastic (FRP) packed bed absorber, instruments, control system with HMI display, pre-assembled recirculation pump, piping, valves, and fittings, interconnect duct, and an FRP ID fan. Instruments are pre-mounted in the piping and pre-wired to the control system.
The Cl2 scrubbing reaction is exothermic. A dilution air damper on the HCl tank vent line dilutes pollutant concentrations to a range that keeps the scrubber from getting too hot. It also provides enough flow for the minimum cross-sectional area needed to house the packing. The packed bed vessel and ductwork are self-supporting for wind and seismic. A high-performance mesh pad at the top of the scrubber removes acid aerosol droplets formed in the scrubber. The recirculation liquid operates at a high pH. The scrubber needs to achieve 99.98% removal for the worst-case loading conditions. The scrubber height and mesh pad work together to achieve performance guarantees.
The scrubber will be delivered in the first quarter of 2022 and is designed to meet the following design conditions: