STEEL BELT CONVEYORS FOR SEVERE CONDITIONS since 1929

GEORGIA POWER - SOUTHERN COMPANY

THE CHALLENGE

Due to evolving environmental regulations that limit the disposal methods of by-products with natural resources, the utilities in the US are challenged with new standards to limit water and typical ash ponds use for the final destination of their ash coming from coal-fired boilers.
Over the course of the next 10 years, nearly all ash ponds will be closed, using several different options. However, there is still ash that needs to be handled and disposed in landfills across the country. In addition, there are costs to both transport and dispose of the ash in landfills, typically on a per ton basis.
Combining these two important issues, Utilities are evaluating different Dry Systems to handle ash from electrostatic precipitators (fly ash), bottom ash, selective catalytic reducer (SCR), flue-gas desulfurization (FGD) scrubbers and bag houses.
In many cases, the fly ash, SCR ash, FGD ash or bag house ash is collected completely dry and pneumatically transported to a wet collection before finally being sluiced to the existing ash ponds along with the bottom ash coming from under boiler water impounded hoppers.
In the coming years, as plants close their ash ponds, these water consuming systems will be converted to dry systems.

 

THE CUSTOMER

Southern Company, second largest utility in the United States with over 9 million customers, has 4 subsidiary retail utilities with assets using coal as fuel.
Georgia Power, one of the retail utilities, operates the largest coal-fired plant in the US, named Robert W. Scherer (Scherer).
Plant Scherer has four units able to produce 3,600 megawatts of electricity and on average supply enough energy to power approximately 1.5 million homes.

 

 

THE SOLUTION

Considering its large quantity of coal assets to be converted within a limited time frame, Southern Company initially decided to provide a single method and technology for the compliance requirements at the fleet.
However, Georgia Power allowed Magaldi and Plant Scherer to investigate together the opportunity for another option.

Plant Scherer and its management & operational staff spent time and efforts on exploring what Magaldi can offer in terms of reliability, operational costs, maintenance costs and longevity.
After nearly a year of investigation, Georgia Power decided to install the Magaldi dry bottom ash handling system.

The MAC® (Magaldi Ash Cooler) technology overcomes the limitations of conventional wet bottom ash systems (WBAS) thanks to a “dry” cooling process to extract and cool down the bottom ash by means of a small amount of ambient air. In this way, all water related problems - both operational and environmental, associated with dewatering bins, waste water treatment, pumps, heat exchangers or pH control, corrosion, water leakages, hot water splashing or vapor explosion, risk of ice in cold climates, pollution from ponds and so on - are completely eliminated.
To date, more than 200 dry bottom ash handling systems have been supplied worldwide under utility and industrial boilers of any size and burning any type of solid fuel.

After spending time at both domestic and European facilities, it was clear for the Customer that the Magaldi system was the best choice to offer Plant Scherer the kind of reduction in operational costs that gives the most competitive advantage for years to come.

Over the course of the next 3 years, each unit will be equipped with our proven technology.

 

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