AEP – Mitchell Plant
- Owner: American Electric Power
- Project: Limestone and Gypsum Handling Systems
- Location: Mitchell Plant, Cresap, West Virginia
- Scope: Engineering, Procurement, Construction, Start-Up and Commissioning
Roberts & Schaefer Company was awarded a turnkey contract from E & C Group, Inc. for engineering, procurement, construction, startup and commissioning of the limestone and gypsum handling systems at American Electric Power’s Mitchell Plant in Cresap, West Virginia. The systems were successfully completed and in operation in 2006.
The limestone handling system is designed to receive limestone from 1,000 to 2,000-ton barges with a rotary clamshell bucket crane. The receiving hopper is provided with fog type dust suppression. The limestone is unloaded and conveyed at 750 TPH to a transfer house. From there the limestone is conveyed and discharged through a stacking tube to a 40,000-ton limestone storage pile. Limestone is reclaimed from the storage pile by gravity or with mobile equipment to two hoppers with variable rate vibratory feeders and conveyed at 750 TPH to a transfer house. From there the limestone is conveyed to two storage silos at the limestone preparation building. Limestone can also be reclaimed from the storage pile with an emergency feeder breaker.
The gypsum handling system is designed to receive gypsum from the process filters at 200 TPH and convey it to either an emergency storage pile or through a series of transfer houses. At the last transfer house the gypsum is either conveyed to the gypsum storage building or to the barge loading dock. At storage building the gypsum is discharged through a traveling tripper. The tripper stockpiles 14,200 tons in the building. Gypsum can also be conveyed at 1,000 TPH to the storage building from the receiving hopper with rotary plow feeder located at the dock. The receiving hopper is provided with fog type dust suppression.
Gypsum is reclaimed from the storage building with a traveling portal scraper reclaimer and conveyed at 1,000 TPH to either barge loadout or the wallboard storage building. An emergency gypsum reclaim hopper fed by mobile equipment is located at the end of the storage building. Barge loadout is through a transfer house and onto a barge loadout shuttle conveyor equipped with a telescopic chute. To the wallboard storage building is through a series of transfer houses.