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‘All-in-one fluegas scrubber cleans up sulfur and particulate matter

By Gerald Parkinson |

A multi-stage wet scrubber that combines the removal of sulfur, hydrogen chloride, sulfuric acid mist (SAM) and particulate matter (PM) in a single unit has reduced sulfur dioxide emissions by an average of 99.7% in its first large-scale commercial installation on a coal/oil-fired swing boiler. PM emissions were reduced to 0.005 grains/dscf (dry standard cubic feet; 12.5 mg/Nm3), according to Kimmo Peltonen, a product manager with Andritz, Inc. (Roswell, Ga.; www.andritz.com), who spoke at the recent TAPPI Engineering, Pulping and Environmental Conference in Memphis, Tenn. Andritz markets the technology together with EnviroCare International (American Canyon, Calif.; www.envirocare.com). The installation is on a 420,000-lb/h boiler at a large pulp-and-paper mill. Previously, smaller systems had been installed in rotary kilns and municipal sludge incinerators, says Peltonen. In the first stage of the process (flowsheet), large particles are removed from hot fluegas by an atomized-water-spray quench. From the quench, the stream enters the lower half of a scrubber-separator vessel — a vertical, cylindrical unit, where the upflowing gas is scrubbed by a countercurrent water stream. The gas flows up through a Venturi stage that…
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