Coking coal, also known as metallurgical coal, is used to create coke, one of the key irreplaceable inputs for the production of steel. There are many varieties of coal in the world, ranging from brown coal or lignite to anthracite. … Coke is produced by heating coking coals in a coke oven in a reducing atmosphere.
What is the difference between coking coal and non coking coal?
A non-caking coal is that coal which on heating in absence of air doesn’t from a coherent mass of residue. … A coking coal is that coal which on heating in absence of air leaves a solid residue. A non-coking coal also leaves a solid coherent residue which may not possess the physical & chemical properties of the coke.
What is CSN in coking coal?
7. Crucible Swelling Number (CSN): The range of CSN in coking coal is 3 of a minimum to a maximum 6. Prime coking coal has high CSN value while soft coking coal has low CSN value. 8. Maximum Dilatation: The value of maximum dilatation is 55% minimum.
What does coking mean?
Definition of ‘coking’
Coking is the process of changing residual oil to low molecular weight gases, naphtha, and gas oils. Coking is a severe method of thermal cracking used to upgrade heavy residuals into lighter products or distillates.
Where is coking coal from?
Metallurgical coal comes mainly from Canada, the United States, and Australia. In the United States, the electric power sector used “93% of total U.S. coal consumption between 2007 and 2018”; only 7% of the total was metallurgical coal and coal for other uses such as heating.
What are two types of coal?
What are the types of coal?
- Anthracite: The highest rank of coal. …
- Bituminous: Bituminous coal is a middle rank coal between subbituminous and anthracite. …
- Subbituminous: Subbituminous coal is black in color and dull (not shiny), and has a higher heating value than lignite.
What are the 4 grades of coal?
Coal is classified into four main types, or ranks: anthracite, bituminous, subbituminous, and lignite.
What is m40 in Coke?
The coke is characterized in terms of quality indices M40 and M10. Index M40 is the expression as a percentage of the fraction greater than 40 mm that is left in the drum. M10 index is the percentage fraction less than 10 mm from the test resulting.
What is PCI coal used for?
Pulverised Coal Injection coal (PCI) – coal used for its heat value and injected directly into blast furnaces (without an intermediate coking phase) as a supplementary fuel, which reduces the amount of coke required and therefore costs. PCI coal can also be sold into the thermal coal market.
How is metallurgical coal used in steel making?
Almost all metallurgical coal is used in coke ovens. The coking process consists of heating coking coal to around 1000-1100ºC in the absence of oxygen to drive off the volatile compounds (pyrolysis). This process results in a hard porous material – coke.
What is the chemical formula of Coke?
Cola extractPubChem CID6850841Molecular FormulaC30H32N8O10SynonymsCola extract Kola extract Cola nut extract Kola nut extract Cola (genus), ext More…Molecular Weight664.6 g/molComponent CompoundsCID 5429 (Theobromine) CID 1203 (L-Epicatechin) CID 2519 (Caffeine)Ещё 2 строки
How is Coke formed?
Metallurgical coke is produced by destructive distillation of coal in coke ovens. Prepared coal is “coked”, or heated in an oxygen-free atmosphere until all volatile components in the coal evaporate. The material remaining is called coke. … Most coke plants are co-located with iron and steel production facilities.
What is Coke deposition?
The formation of carbonaceous deposits (coke) in zeolite pores during catalysis leads to temporary deactivation of catalyst, necessitating regeneration steps, affecting throughput, and resulting in partial permanent loss of catalytic efficiency.
What is Coke vs coal?
By distilling bituminous coal in retorts to obtain gas for illumination, or by burning it in kilns or pits, the residue left behind is called coke, which is simply coal charcoal, and is nearly pure carbon.
What is the name for the highest rank coal?
Anthracite. Anthracite is the highest rank coal. It is a black, shiny, hard rock and is not friable. It is low in volatile matter and this makes it difficult to burn in rotary kilns.
Is coal a tar?
Coal tar is derived from coal. It is a byproduct of the production of coke, a solid fuel that contains mostly carbon, and coal gas. Coal tar is used primarily for the production of refined chemicals and coal-tar products, such as creosote and coal-tar pitch.