MATERIAL ACTIVATION SYSTEMS AIRSWEEP UNPLUGS COAL: ROI IN JUST 2 WEEKS Scrubgrass Generating Plant in Venango County, PA produces electricity using bituminous waste coal, a mining by-product. Advanced environmental control technologies allow the use of this coal as a clean energy source. In 2003, Scrubgrass was experiencing problems with their coal process and sought ways to correct clogging in their chutes. THE PROBLEM Bituminous coal contains high concentrations of sandstone, clay, and moisture. When moving the coal to a hammermill through a 20” wide, 4-ft long feed chute, the material would plug, forcing operators to shut down the process. Once the hammermill, or even the entire coal processing system was shut down, a worker would enter the chute with an airlance and chip away

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