Coke (fuel)

Coke is a fuel with few impurities and a high carbon content, usually made from coal. It is the solid carbonaceous material derived from destructive distillation of low-ash, low-sulfur bituminous coal. Cokes made from coal are grey, hard, and porous. While coke can be formed naturally, the commonly used form is man-made. The form known as petroleum coke, or pet coke, is derived from oil refinery coker units or other cracking processes.

Coke is used in preparation of producer gas which is a mixture of carbon monoxide and nitrogen. Producer gas is produced by passing air over red-hot coke. Coke is also used to manufacture water gas.

History

China

Historical sources dating to the 4th century describe the production of coke in ancient China. The Chinese first used coke for heating and cooking no later than the ninth century. By the first decades of the eleventh century, Chinese ironworkers in the Yellow River valley began to fuel their furnaces with coke, solving their fuel problem in that tree-sparse region.

Petroleum coke

Petroleum coke (often abbreviated pet coke or petcoke) is a carbonaceous solid delivered from oil refinery coker units or other cracking processes. Coking processes that can be employed for making petcoke include contact coking, fluid coking, flexicoking and delayed coking. Other coke has traditionally been delivered from coal.

This coke can either be fuel grade (high in sulfur and metals) or anode grade (low in sulfur and metals). The raw coke directly out of the coker is often referred to as green coke. In this context, "green" means unprocessed. The further processing of green coke by calcining in a rotary kiln removes residual volatile hydrocarbons from the coke. The calcined petroleum coke can be further processed in an anode baking oven in order to produce anode coke of the desired shape and physical properties. The anodes are mainly used in the aluminium and steel industry.

Petcoke is over 90 percent carbon and emits 5 to 10 percent more carbon dioxide (CO2) than coal on a per-unit-of-energy basis when it is burned. As petcoke has a higher energy content, petcoke emits between 30 and 80 percent more CO2 than coal per unit of weight. The difference between coal and coke in CO2 production per unit energy produced depends upon the moisture in the coal (increases the CO2 per unit energy – heat of combustion) and volatile hydrocarbon in coal and coke (decrease the CO2 per unit energy).

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Latest News for: coking

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It’s been 40 years since debut of ‘New Coke,’ Coca-Cola’s biggest failure

The Keene Sentinel 26 Apr 2025
It’s been 40 years since Atlanta-based Coca-Cola launched a new formula for its famed namesake cola, called it New Coke and prompted a national outcry — forcing the company to walk back the decision on its biggest blunder ever ... .
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India urging firms to acquire overseas iron ore, coking coal assets, official says

The Times of India 26 Apr 2025
... overseas assets of essential raw materials like iron ore and coking coal.
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‘You’ve got so many years left’: Spirit passenger orders a Diet Coke mid-flight. Then the ...

The Daily Dot 26 Apr 2025
The Redditor shares he ordered a $6 Diet Coke from the trolley mid-flight, and was handed a can that tasted “weird” and “off.” He flipped the can and checked the best-by date, which wrote ... Spirit passenger orders a Diet Coke mid-flight.
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India's NMDC Limited scouts to acquire coking coal assets in Australia and Indonesia

SteelOrbis 25 Apr 2025
India, the world's second-largest producer of crude steel, meets 85 percent of its coking coal requirements through imports ... country's coking coal imports.
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India's coking coal imports forecast to surge 175 percent by 2030

SteelOrbis 25 Apr 2025
India's coking coal imports are expected to surge by a massive 175 percent to 160 million mt by 2030, due to limited domestic availability and the ramping up of ...
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India's RINL seeks overseas supplier of BF grade coke for May delivery

SteelOrbis 24 Apr 2025
Eligible bidders need to be established BF coke producers owning cokeries and producing BF coke or BF coke suppliers offering BF Coke produced by a cokery or coke ...
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BIZ-NEW-COKE-ANNIVERSARY-AT

Decatur Daily 24 Apr 2025
A video at the Beverage Lab at the World of Coca-Cola Museum shows The Atlanta Journal-Constitution story about Coca-Cola bringing back the original Coke formula in 1985 after backlash about New Coke ... .
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China's coking coal imports slip in March

Kallanish Commodities 23 Apr 2025
China's coking coal imports fell month-on-month in March, dragged down by falling supplies from the United ....
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Chinese coke prices started to rise in mid-April

GMK Center 23 Apr 2025
Quotes for Chinese coke in the port of Zhizhao rose by $1.4/t – to $184/t FOT between April 11 and 18, according to Kallanish ... This puts pressure on the margins of China’s coke production, as prices for finished steel are declining.
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China coke prices inch up, sentiment weakens

Kallanish Commodities 21 Apr 2025
The first-round coke price increase was fully implemented last Tuesday, but market participants are sceptical of ....
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