Babcock & Wilcox said that its environmental business unit won a contract worth more than $20 million to design and supply ash-handling and conveying technologies for an unnamed power plant in North America. 

The equipment is designed to help the plant operator reduce the environmental impact of the plant and comply with emissions regulations.

B&W Environmental will design, manufacture and supply four Allen-Sherman-Hoff Submerged Grind Conveyor (SGC) systems. The equipment is designed to meet effluent limitation guidelines (ELG) and coal combustion residuals (CCR) requirements. The company also will supply two tube conveyors for the project. The SGC systems will be manufactured in B&W’s Lancaster, Ohio, facility.

The SGS system is designed to convey dewatered bottom ash from hopper through a series of SGCs for discharge into a storage bunker.

B&W said its system makes use of existing bottom ash hoppers or slag tanks for bottom ash collection, along with existing bottom ash gates, clinker grinders and transfer enclosures (dog houses) between gate and grinders.

The conveyors can be oriented at angles to avoid existing structures and equipment, reducing or eliminating the requirement for a straight pathway to a location outside the boiler building. 

The company said its system is smaller and lighter than conventional submerged chain conveyors because it receives bottom ash after crushing by clinker grinders and is not subject to heavy loads from slag falls or the weight of bottom ash stored during maintenance.

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