Coke (fuel)

Coke is a fuel used mainly in blast furnaces to reduce iron oxide to produce iron. It contains carbon, and is similar to coal. It is made from coal by cooking out things that are not carbon. Coke is a product of destructive distillation of coal. This is done in an airless furnace or oven (kiln) at temperatures as high as 2,000 °C (3,600 °F) but usually around 1,000–1,100 °C (1,800–2,000 °F). This baking drives off volatile parts of the coal, such as water, gas, and tar.

Coke is an almost pure form of carbon. The calorific value (heat energy produced when a fuel is burnt) of coke is about 56,000 kilojoules/kilogram.

Coke oven at smokeless fuel plant, Abercwmboi, South Wales, 1976

Coke is used as a fuel and as a reducing agent in smelting iron ore in a blast furnace. The carbon monoxide produced by its combustion reduces iron oxide (hematite) to the iron product.

Although coke is more expensive than coal, it can be used in households as a clean fuel, relatively free of smoke and impurities. At the present day its use in domestic heating has been less than oil or gas, but in the 20th century it was often used in kitchen stoves.

Coke (fuel) Media

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  KoksBrennstoff

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  Postcard depicting coke ovens and coal tipple in Pennsylvania

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  Hanna furnaces of the Great Lakes Steel Corporation, Detroit. Coal tower atop coke ovens. November 1942

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  The Illawarra Coke Company (ICC) in Coalcliff, New South Wales, Australia

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  The original blast furnaces at Blists Hill, Madeley

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  41 018 of the Deutsche Reichsbahn climbing the famous Schiefe Ebene, 2016

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  Illustration of coal mining and coke burning from 1879

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  Coal coking ovens at Cokedale, Colorado, supplied steel mills in Pueblo, CO

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  The 200 Cherry Valley Coke Ovens built around 1866