The MAC® (Magaldi Ash Cooler) is a unique system for dry extraction, air cooling and mechanical handling of bottom ash from pulverized coal-fired boilers.
With hundreds of installations worldwide since the 1980’s, the MAC® is the world’s leading dry bottom ash handling system for utility and industrial boilers of any size and burning any kind of solid fuel.
Proven by millions of trouble-free operating hours, the reliability of the MAC® is guaranteed by the “multi-link” design of the Magaldi Superbelt® - core technology of the MAC® system - realised according to a “damage-tolerant” approach ensuring safe collection and conveyance of extremely hot, abrasive and dusty ash, even if containing very large lumps.
High temperatures and tear issues are solved thanks to the patented method of connecting the pans to the mesh belt, which leaves all elements free to expand in any direction.
In the MAC® system, ash cooling is carried out by ambient air, naturally drawn into the system by the negative pressure of the furnace. That air recovers a significant amount of energy in the form of ash sensible heat, ash chemical energy from unburnt particles and boiler radiation flux through the throat. The dry cooling process has been proven to have no negative effects on the main combustion.
Compared to conventional wet systems, the MAC® can improve boiler efficiency by a factor in the range 0.1÷0.6%, depending on the coal properties and ash rates, calculated within the framework of ASME PTC4-2013.
Coal fired power plants
Unit size: 150 MWe
Project type: Greenfield
Ash rate: 3 t/h
Ash rate max: 4 t/h
Burned fuel: Coal
Boiler manufacturer: B&W
Coal fired power plants
Unit size: 65 MWe
Project type: Retrofit
Ash rate: 3 t/h
Ash rate max: 9 t/h
Burned fuel: Coal
Boiler manufacturer: RAFAKO
Coal fired power plants
Unit size: 605 MWe
Project type: Greenfield
Ash rate: 5 t/h
Ash rate max: 15 t/h
Burned fuel: Coal
Boiler manufacturer: BABCOCK BORSIG POWER
Coal fired power plants
Unit size: 116 MWe
Project type: Greenfield
Ash rate: 1 t/h
Ash rate max: 3 t/h
Burned fuel: Coal
Boiler manufacturer: KHI
Coal fired power plants
Unit size: 300 MWe
Project type: Greenfield
Ash rate: 27 t/h
Ash rate max: 34 t/h
Burned fuel: Coal
Boiler manufacturer: DONGFANG BOILER
Coal fired power plants
Unit size: 660 MWe
Project type: Greenfield
Ash rate: 4 t/h
Ash rate max: 10 t/h
Burned fuel: Bituminous coal
Boiler manufacturer: ALSTOM (China)
Coal fired power plants
Unit size: 650 MWe
Project type: Greenfield
Ash rate: 5.9 t/h
Ash rate max: 11.8 t/h
Burned fuel: Bituminous coal
Boiler manufacturer: MHPS
Coal fired power plants
Unit size: 80 MWe
Project type: Retrofit
Ash rate: 2 t/h
Ash rate max: 3.3 t/h
Burned fuel: Brown coal
Boiler manufacturer: BKZ
Coal fired power plants
Unit size: 600 MWe
Project type: Greenfield
Ash rate: 7 t/h
Ash rate max: 18 t/h
Burned fuel: Coal
Boiler manufacturer: BHI
Coal fired power plants
Unit size: 800 MWe
Project type: Greenfield
Ash rate: 4.7 t/h
Ash rate max: 6 t/h
Burned fuel: Berezovsky brown coal
Boiler manufacturer: PJSC “EMAlliance”
Coal fired power plants
Unit size: 800 MWe
Project type: Greenfield
Ash rate: 7.5 t/h
Ash rate max: 15.1 t/h
Burned fuel: Bituminous coal
Boiler manufacturer: MHI
Coal fired power plants
Unit size: 1,000 MWe
Project type: Greenfield
Ash rate: 6.8 t/h
Ash rate max: 10.1 t/h
Burned fuel: Bituminous / sub-bituminous coal
Boiler manufacturer: BHK
Coal fired power plants
Unit size: 300 MWe
Project type: Greenfield
Ash rate: 7 t/h
Ash rate max: 14 t/h
Burned fuel: Coal
Boiler manufacturer: SEC
Coal fired power plants
Unit size: 750 MWe
Project type: Greenfield
Ash rate: 5.6 t/h
Ash rate max: 14.1 t/h
Burned fuel: Coal
Boiler manufacturer: HITACHI Power Europe
Coal fired power plants
Unit size: 426 MWe
Project type: Retrofit
Ash rate: 12 t/h
Ash rate max: 40 t/h
Burned fuel: Coal
Boiler manufacturer: B&W
Coal fired power plants
Unit size: 385 MWe
Project type: Greenfield
Ash rate: 6 t/h
Ash rate max: 8 t/h
Burned fuel: CPRB (Powder River Basin)
Boiler manufacturer: B&W
Coal fired power plants
Unit size: 651 MWe
Project type: Greenfield
Ash rate: 9 t/h
Ash rate max: 22 t/h
Burned fuel: Coal
Boiler manufacturer: MHI
Coal fired power plants
Unit size: 350 MWe
Project type: Retrofit
Ash rate: 8 t/h
Ash rate max: 16 t/h
Burned fuel: Coal
Boiler manufacturer: MHI
Coal fired power plants
Unit size: 500 MWe
Project type: Retrofit
Ash rate : 4.5 t/h
Ash rate max: 25 t/h
Burned fuel: Coal
Boiler manufacturer: ALSTOM
Coal fired power plants
Unit size: 150 MWe
Project type: Retrofit
Ash rate: 1 t/h
Ash rate max: 2 t/h
Burned fuel: Petcoke
Boiler manufacturer: ANSALDO
Coal fired power plants
Unit size: 300 MWe
Project type: Retrofit
Ash rate: 12 t/h
Ash rate max: 25 t/h
Burned fuel: Lignite
Boiler manufacturer: EVT
Coal fired power plants
Unit size: 165 MWe
Project type: Retrofit
Ash rate: 6 t/h
Ash rate max: 10 t/h
Burned fuel: Lignite
Boiler manufacturer: MAN
Coal fired power plants
Unit size: 66 MWe
Project type: Retrofit
Ash rate 1 t/h
Ash rate max: 1.6 t/h
Burned fuel: Coal
Boiler manufacturer: FOSTER WHEELER