SITE

Charleston, Tennessee

PROBLEM

Off-gas from a rotary kiln thermal treatment unit contains mercury vapors, HCl, SO₂ and particulate matter. To obtain a permit to operate, these emissions must be reduced to meet new source performance standards and strict local regulations. An integrated air pollution control system was needed that would efficiently collect these pollutants and provide a very high reliability rate.

solution

Emtrol designed and supplied a wet scrubbing system consisting of an adiabatic quencher, a sub-cooler with a heat exchanger to condense mercury vapor, a venturi scrubber for particulate removal and a combination packed column and entrainment separator for absorption of acid gases and mist elimination. The system included all required ancillary equipment such as pumps, piping, recycle tanks, ductwork and blowers, instruments and controls and a support structure with access platforms.  The major equipment components were completely pre-assembled and tested in the factory prior to shipment.

The system was designed to use 20% Sodium Hydroxide solution as a neutralization reagent and liquid discharge from the system was minimized through efficient re-circulation and distribution of the scrubbing liquid.

The entire system was fabricated of highly corrosion resistant alloys and reinforced thermoplastics to provide long life with minimal maintenance.

result

The Emtrol Wet Scrubbing System was put into operation in early 1993 and has exceeded all guaranteed emission limits. The system was installed quickly and with a minimum effort because the unit was pre-assembled then each component was match-marked and tagged prior to shipment.

Emtrol's ability to package equipment into an integrated system has proven to be a reliable and cost effective approach to solving complicated air emission problems.