John Twitty Energy Center Concrete CCR Tank Design

The Concrete Bottom Ash Dewatering Tank to meet CCR compliance at City Utilities of Springfield, Missouri’s (CUS) John Twitty Energy Center is operational as of January 28th, 2016. This was a fast paced project for both Sega and CUS. Beginning in October of 2015, the design team’s task was to design a bottom ash facility…

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Ash Handling Upgrade

Project Description: Bottom ash system modifications for a 750-MW B&W cyclone boiler, with 6 million pph steam capacity burning a blend of Powder River Basin and local coals. The slag tanks and sluice system were removed and replaced by three United Conveyor Corporation (UCC) submerged flight conveyors (SFC), which are driven by variable-speed hydraulic motors. Two SFCs receive,…

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Dry Ash Handling System

Project Description: This EPC project included two 225-ton bolted steel storage silos with required conveying equipment, valves, vents, filters, blowers, exhausters, and fluidizing capabilities for dry or wet ash unloading. The system collects ash from 5 units with a combined generating capacity of 255-MW. The project included construction permitting, site preparation, foundations, stair towers, access platforms, compressed air,…

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Bottom Ash Gypsum Dewatering Project

Project Description: Sega was the design engineer for a contractor-led engineer-procure-construct (EPC) project to develop a remote gypsum and bottom ash dewatering facility. Major project components included the following: Dewatering service/control/electrical building Gypsum dewatering equipment including: hydro-cyclones, horizontal belt filters, gypsum thickeners, & associated equipment Dry gypsum belt conveyors Bottom ash dewatering equipment including two submerged…

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Fly Ash System Upgrades

Project Description: This project included the installation of a single-vessel fly ash filter/separator, bin vent filter, controls, and auxiliary equipment for common use by 3 generating units with combined electric generating capacity of 93-MW. Scope of Work: The project included design document preparation for purchase and installation of ash handling equipment, controls integration into existing plant control…

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