MATERIAL ACTIVATION SYSTEMS MAJOR ELECTRIC UTILITY SOLVES DRY SORBENT INJECTION (DSI) MATERIAL FLOW PROBLEM A major electric utility’s coal-fired plant in the Midwest needed to meet Federal emissions standards while keeping power output maximized. This 2600 MW plant contained a pair of the largest coal-fired generators in the U.S. To meet Federal emission standards, the plant installed a Dry Sorbent Injection (DSI) system designed to mitigate hydrogen chloride (HCI) and sulfur dioxide (SO 2 ) flue gas emissions. THE PROBLEM DSI technology relies on bulk solid materials that exhibit poor flow properties, such as Hydrated Lime, Trona, Soda Ash and Sodium Bicarbonate. At this generating station, the process feeding the powdered material to the DSI system consisted of a 5-foot diameter

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