fly ash

noun

fine solid particles of ash that are carried into the air when fuel is combusted

• Hypernyms: ↑ash

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noun

: fine solid particles of noncombustible ash with or without accompanying combustible particles carried out of a bed of solid fuel by the draft and deposited in quiet spots within a furnace and flues or within a boiler setting or carried out of a chimney with the waste gases and often recovered for use as a constituent in commercial products (as phonograph records, cements, and bricks)

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1. fine particles of ash of a solid fuel carried out of the flue of a furnace with the waste gases produced during combustion.

2. such ash recovered from the waste gases, used chiefly as a reinforcing agent in the manufacture of bricks, concrete, etc.

[1930-35]

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fly ash noun

Fine particles of ash released into the air during eg the burning of fossil fuels in power stations, also used in brickmaking and as a partial substitute for cement in concrete

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Main Entry: ↑fly

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fly ash,

1. the fine ash or residue that is produced by the industrial use of pulverized coal as fuel.

2. the unburned residue of any solid fuel.

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n. ash produced in small dark flecks, typically from a furnace, and carried into the air