Why coking is done?
Coking is the heating of coal in the absence of oxygen to a temperature above 600 °C to drive off the volatile components of the raw coal, leaving a hard, strong, porous material of high carbon content called coke. Coke consists almost entirely of hydrocarbons.
What is coking and decoking?
petroleum refining In petroleum refining: Visbreaking, thermal cracking, and coking. Decoking is a routine daily occurrence accomplished by a high-pressure water jet. First the top and bottom heads of the coke drum are removed. Next a hole is drilled in the coke from the top to the bottom of the vessel.
What is coke from a refinery used for?
3 Petroleum coke. Petroleum coke is a byproduct of petroleum refining, useful in the production of electrodes used as carbon anodes for the aluminum industry, graphite electrodes for steel making, as fuel in the firing of solid fuel boilers used to generate electricity, and as a fuel for cement kilns [32].
What type of coal is coking coal?
Metallurgical coal, also known as coking coal, is used to produce coke, the primary source of carbon used in steelmaking. Metallurgical coal differs from thermal coal, which is used for energy and heating, by its carbon content and its coking ability.
What is the meaning of coking coal?
Coking coal refers to coal with a quality that allows the production of a coke suitable to support a blast furnace charge. Its gross calorific value is greater than 23 865kJ/kg (5 700 kcal/kg) on an ash-free but moist basis.
Why is coke used instead of coal?
The single most important factor is strength ( mechanical compressive ); coal is heated to make coke, the resulting coke is stronger than the original coal. Also, coke helps to make the charge of iron oxides and limestone more porous to permit gas flow up and droplets of liquid iron and slag down.
Which is better coal or coke?
Coke is a better fuel than coal. Coke is more efficient and has a higher calorific value than coal.
What is difference between coking coal and coal?
Noncoking coals have higher ash content and are typically used in thermal power plants as steam coals. Coking coal is the type of coal which on heating in the absence of air undergoes a transformation into a plastic state, swells, and then solidifies to form coke.
Why is it called coking coal?
The industrial production of coke from coal is called coking. The coal is baked in an airless kiln, a “coke furnace” or “coking oven”, at temperatures as high as 2,000 °C (3,600 °F) but usually around 1,000–1,100 °C (1,800–2,000 °F).
What is the difference between coal and coking coal?
Coal and Coke are both a type of fossil fuels. The difference between these two fuels is that coal is mostly carbon but coke contains mostly water and less than half the carbon content of coal.
Can steel be made without coke?
The world is powering past coking coal It is a myth that steel production requires coking coal. A third of global steel today is made without coking coal, either through scrap recycling or gas-based steel production; and counting.
Why coke is not used as fuel?
Answer: because fuel has different properties than coke as fuel can help a car move and coke can’t do do that as it does not have the chemicals to complete that task …
What type of coal is used for coking coal?
Bituminous class coals of high, medium, and low volatile rank that possess these properties are called “coking” coals. High quality coking coals are in great demand by steel producers, who need these coals to make high quality coke to maximise the productivity of their blast furnace operations.
How is coking coal different from coal?
The key difference between coking coal and thermal coal is that coking coal is mainly used to produce high-quality coke, whereas thermal coke is important in producing electricity. Coal is a type of sedimentary rock that is combustible.
Is there an alternative to coking coal?
Hydrogen is the new coal The alternative is to get rid of the blast furnace and electrify steel production, most prominently through using green hydrogen, produced from water with renewable electricity.
Why is coke is better than coal?
What is the difference between steam coal and coking coal?
The key difference between coking coal and thermal coal is that coking coal is mainly used to produce high-quality coke, whereas thermal coke is important in producing electricity. Thermal coal is highly produced and has a low cost while thermal coal usage is limited due to environmental considerations.
What is special about coking coal?
Coking coal typically contains more carbon, less ash and less moisture than thermal coal, which is used for the generation of power. Hard coking coal is used in the coke ovens. It is a necessary input in the production of strong coke.