Metalfab Standard Bin Activators

Mercury Capture...

A Continuing Emphasis for
U.S. Coal-Fired Power Plants

Stringent government mercury (Hg) emission regulations at the national and state levels require large mercury emission reductions at the nation’s 1,100 plus coal-fired plants, which emit approximately 48 tons of mercury per year. Among the few proven mercury emission control technologies that exist, the predominant process is Activated Carbon Injection (ACI). Powdered Activated Carbon (PAC) injection is the only control technology proven to reduce mercury emissions in excess of 90%.

PAC Storage and Handling Systems

The cornerstone of Metalfab’s PAC Storage and Handling System is the integration of the company’sproven bin activators, activated Posibins™and “Better-Weigh®” gravimetric feeders. These critical system components are integrated with process controls, instrumentation, knife gate valves, and interconnecting piping, all pre-installed within the skirt area beneath a fully engineered storage silo. This integrated system provides precise PAC metering to the final downstream injection system feeding the flue gas ductwork.

Metalfab successfully combines testing, equipment design, and system integration capabilities to offer fully integrated PAC handling systems directly to large environmental/boiler OEMs who supply complete ACI systems to power plants.

Feature		Benefit
	Fully Integrated System with Field-Proven Equipment and Performance	Delivers Long-Term Reliability with Low Life Cycle Cost
	Unique, Adjustable, Secondary Discharge Baffle	Guarantees Continuous Sorbent Flow without Product Compaction and Arching
	Bin Activator Designed to Improve Density of PAC	Maintains Consistent PAC Bulk Density without Fluidization
	Adjustable Vibration Force on Bin Activators and Distribution Hoppers	Breaks up Compacted PAC that has Settled in Silo During Extended Unit Out-of-Service Periods
	Significantly Greater Minute-to-Minute Feed System Accuracy	Reduces PAC Consumption and Operating Costs Compared to Gravimetric Rotary Air Metering Systems
	No Additional Compressed Air Requirement Beyond Instrument Air	Reduces Utility Costs, Maintenance, and Fugitive Dust
	Even Draw-Down of PAC from Silo to Feeders	Permits First-In/First-Out Flow of PAC on Demand
	Highly Efficient “Better-Weigh®” Gravimetric Screw Feeder with Only Two Moving Parts	Reduces Equipment Downtime and Related Maintenance Costs
	Simple Screw and Tube Change	Allows Greater Flow Range with Rates up to 8400 Pounds per Hour (280CFH)
	PLC-Based Controls and Monitoring with Easy-to-Use Touch Screen Displays	Provide a User-Friendly Interface for: • Automated Feed Rate Optimization • Batch History and Discharge Data • Security Controls with Associated Warnings and Alarms