In June, 2003, Boeing contacted with Walgren Company (Grand Rapids, MI) for manufacture of an alodize line. The 5-stage alodize system was specified with a Tri-Mer “Fan/Separator” to handle acid fumes.
The Fan / Separator is a highly efficient, double-pack system. It is “all-mechanical,” and operates with 20% less brake horsepower than competitive systems. Fan / Separators scrub corrosive fumes at 1/10th the water required by traditional wet scrubbers.
Operational efficiencies are in the 99% efficiency range, thanks in part to use of the fan as a centrifuge in scrubbing. The system is positively pressured, so air is pushed, rather than pulled, through the system. Energy use is typically 15 to 20% less than comparable wet scrubbers that have a negative pressure design.
The Fan /Separator is extremely effective in eliminating corrosive fumes, even when loading is variable. It yields a low humidity stack.
Previous to the work at Boeing Helicopter, Tri-Mer provided scrubbers for four finishing lines at Boeing Precision Gear. Those lines perform eleven finishing processes: hard chrome, cadmium, copper, nickel, tin and aluminum chromate; also stainless passivation, black oxiding, pickling, magnesium dichromate and Nital etch. The scrubbers provided by Tri-Mer for this Boeing project include a Chrome Eliminator and four Crossflow Scrubbers.