Ash Handling Technologies
and other Bulk Material Solutions
Bottom Ash (Bed Ash) Handling Systems
For big coal fired units there are basically two types of boilers: pulverized coal fired (PC) boilers and fluidized bed type boilers.
Bottom ash (slag) handling for PC units
In most of the PC units the bottom ash is removed by under-water submerged scraper conveyor (SCC) and crushed below 100 mm. (SCC & crusher is normally part of the boiler supplier). The crushed and partly dewatered bottom ash is transported:
Bottom ash from bottom ash silo can be fed into trucks or belt conveyors for further transport to disposal area or can be fed into mixing technology of high concentration ash disposal system where bottom ash, fly ash, water (in some cases gypsum slurry) is properly mixed to achieve 1-1 solid-water ratio and pumped to final disposal area.
Bottom ash handling for fluid bed boiler application
Bed ash from fluid bed boilers are removed in dry form and cooled down below 150-200 °C for conveying and storage.
Mechanical ash conveying system including: cooling screws, scraper conveyors, vibrating screens, crushers
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