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An ash pit may sometimes be detected by the presence of white ash or swarms of insects hovering about. Nearly translucent smoke that quickly dissipates may be visible emanating from an ash pit when it is between the observer and the sun. Due to incomplete burning, an ash pit may also produce a smell of burning creosote or incomplete combustion.
The older and simpler kind of incinerator was a brick-lined cell with a fixed metal grate over a lower ash pit, with one opening in the top or side for loading and another opening in the side for removing incombustible solids called clinkers. Many small incinerators formerly found in apartment houses have now been replaced by waste compactors.
An ash pond, also called a coal ash basin or surface impoundment, [1] is an engineered structure used at coal-fired power stations for the disposal of two types of coal combustion products: bottom ash and fly ash.
Ash dump—An opening in a hearth to sweep ashes for later removal from the ash pit. [21] Back (fireback)—The inside, rear wall of the fireplace of masonry or metal that reflects heat into the room. [21] Brick trimmer—A brick arch supporting a hearth or shielding a joist in front of a fireplace. [21]
A coal-fired power plant with ash ponds. 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.
There are many different subsets of this method, including valley impoundments, ring dikes, in-pit impoundments, and specially dug pits. [1] The most common is the valley pond, which takes advantage of the natural topographical depression in the ground. [1] Large earthen dams may be constructed and then filled with the tailings.
The two pits discovered were not thought to be used for fire. One appeared to be a storage pit and the other an ash pit. 18 hearths were found on many different levels showing different occupations of humans. The hearths consisted of surface hearths and basin hearths, basin hearths being the most common and also the most sophisticated. [21]
The Ash Pit, sometimes referred to by the numeronym ML-3, is the youngest and southernmost eruptive centre of the Mess Lake Lava Field. [16] It lies on the steep southern slope of the Kitsu Plateau inside Nagha Creek valley and has been described as a pyroclastic cone or a conical explosion crater .