US Magnesium is implementing an electrolytic expansion project located in Rowley, UT. A scrubbing system is needed to remove particulate from a chlorine gas stream that originates in the anode compartments of electrolytic cells that produce magnesium metal. A significant portion of the particulate is less than 1 micron in size, making it difficult to remove.
Chlorine is an important by-product of the electrolytic process. Scrubbed chlorine flows to a chlorine plant for further processing and liquefaction. The scrubbing equipment must be designed and constructed in a manner to minimize air in-leakage and chlorine emissions. Materials of construction must be selected to withstand severe corrosive characteristics of > 90% chlorine (Cl2) gas.
Particulates in the gas leads to maintenance associated with downstream filters in the chlorine plant. It is therefore necessary to maximize removal efficiency to minimize filter maintenance costs.
The customer selected an Envitech high efficiency Venturi Scrubber. The equipment includes a fixed throat fiber reinforced plastic (FRP) Venturi scrubber and horizontal chevron style entrainment separator. Additional scope of supply includes instruments, pre-assembled pump skid with redundant titanium pumps (1 operating and 1 spare), pre-assembled CPVC piping, redundant fans with titanium wheel and housing, interconnect FRP ductwork, dampers, and equipment skid and platforms.
Because a large fraction of particulate is submicron in size and difficult to remove, the fans and vessels are designed to operate at -70” water column pressure drop.
An Envitech Venturi scrubber was installed on the original process in 1999. The new scrubber for the expansion project was installed in 2011. Both systems continue to operate with high reliability and uptime. The table below summarizes key design parameters for the new Venturi scrubber.
- Inlet flow rate: 8,200 acfm
- Inlet temperature: 130oF
- Gas Composition: > 90% Cl2 gas
- Pressure drop: 60" W.C.
- PM Removal: > 75%
Click on the link below to download a case study and other Venturi scrubbing literature.