How is grading of coal done?

What are the 4 grades of coal?

Coal is classified into four main types, or ranks: anthracite, bituminous, subbituminous, and lignite. The ranking depends on the types and amounts of carbon the coal contains and on the amount of heat energy the coal can produce.

What is Grade A coal?

No coal is graded according to its energy content (CV) as well as its size. An A grade coal has a CV higher than 27,5 MJ/kg, a B grade between 26,5 -27,5 MJ/kg, a C grade between 25,5 – 26,5 MJ/kg etc.

Is anthracite better than coal?

From a performance and heating standpoint, anthracite is a higher quality coal for domestic, open fire heating. While harder to ignite, anthracite does burn for a longer period of time at a hotter temperature, meaning it is more effective at providing reliable warmth for your household. Both coals are fossil fuels.

How is coal GCV calculated?

The best equation has the following form: GCV= 25.284 (M) + 30.572 (Ash) + 62.127 (VM) + 138.117 (FC) – 2890.095. The result is in agree with previous work that equation involving four independent variables i.e. moisture (M), ash, volatile matter (VM) and fixed carbon (FC) provides the most accurate estimation of GCV.

Is coke obtained from coal tar?

Coal tar: It is obtained as a by-product in the process of making coke. Though its colour is the same as coke, tar is a highly viscous liquid.

Coal And Its By – Products: Coke, Tar And Coal Gas.

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How is Coke different from coal?

Coal is a lustrous, black fossil fuel that includes impurities, generates smoke, and generates less heat than coke when burned. Coke is a dingy, black coal waste that burns hotter and cleaner. … Coke is a fuel made from mineral coal that has been calcined or dry distilled.

What is the formula of coal?

The chemical formula of coal is reported as: C135H96O9NS. Coal is usually taken as 85% carbon based on dry mass.

What are the characteristics of good quality of coal?

Good burning characteristics – Complete combustion without agitation. Good grindability – sometimes it is needed to grind coal before burning. Good coal should not cause high abrasion on the machine. High ash softening temperature – High Ash softening temperature lower the risk of slagging.

What are the types of coal analysis?

Some of the Common Tests conducted on Coal include

  • Calorific value(Gross/net)
  • Proximate analysis- Moisture,Volatile matter, Ash and Fixed Carbon.
  • Ultimate analysis – C,H, O, N, S and Ash.
  • Ash analysis – Al2O3, SiO2, CaO, MgO,TiO2, Na2O, K2O, S etc.,
  • Ash Fusion Temperature.
  • Coke Reactivity.
  • Hard-grove Grindability Index.