A multi-unit coal-fired power station where both dry and wet bottom ash handling systems are employed provides an opportunity for detailed comparison of the two approaches. Dry systems have significant advantages for bottom ash handling at coal fired power plants, with considerable environmental and economic benefits in the case of both new build projects and replacements of existing wet systems. At present Magaldi is uniquely placed in the dry ash handling field to demonstrate, analyse and quantify the benefits of dry over wet ash handling. The company has installed, since , some 90 dry ash handling systems of the MAC Magaldi Ash Cooler type - see Figures 1 and 2 around the world, in both new boilers and as retrofits. In understanding the benefits of dry bottom ash extraction systems compared with wet systems, a particularly meaningful comparison can be done in the case of plants where both systems are installed.
Bottom ash - SourceWatch
Jump to navigation. Coal ash n. Fly ash n. Bottom ash n. Few people have heard of coal ash.
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Coal Ash Basics
Along with fly ash , which is captured by pollution control equipment from coal plant chimneys, it is often referred to simply as coal ash. Coal bottom ash is a coarse, granular byproduct of coal combustion that is collected from the bottom of coal furnaces in power plants. When pulverized coal is burned in a dry bottom boiler, approximately 80 percent of the unburned material is captured from the chimney as fly ash.
Bottom ash is part of the non- combustible residue of combustion in a power plant , boiler , furnace or incinerator. In an industrial context, it has traditionally referred to coal combustion and comprises traces of combustibles embedded in forming clinkers and sticking to hot side walls of a coal-burning furnace during its operation. The portion of the ash that escapes up the chimney or stack is, however, referred to as fly ash.