What is coal rank and grade?
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What is coal rank and grade?
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 a grade coal?
Coal Grades
| Grade | Ash Content |
|---|---|
| Steel Grade -II | Exceeding 15\% but not exceeding 18\% |
| Washery Grade -I | Exceeding 18\% but not exceeding 21\% |
| Washery Grade -II | Exceeding 21\% but not exceeding 24\% |
| Washery Grade -III | Exceeding 24\% but not exceeding 28\% |
What is coal rank based on?
The most common classification is based on rank, referring to the degree of coalification that has occurred. The rank of a coal is determined primarily by the depth of burial and temperature to which the coal was subjected over time. With increasing temperature, peat is converted to lignite, a very soft, low-rank coal.
What is the highest grade while what is the lowest grade coal?
Anthracite is the highest grade, while Lignite is the lowest grade coal.
What are the different grades of coal How are the grades determined?
| Grade of Coal | Range of Gross Calorific Value In Kilo Calories |
|---|---|
| G3 | Greater than 6400 and Less than 6700 |
| G5 | Greater than 5800 and Less than 6100 |
| G7 | Greater than 5200 and Less than 5500 |
| G9 | Greater than 4600 and Less than 4900 |
What is low grade coal?
Low-grade coals are usually those that are low in specific energy because of high moisture content and/or ash content or produce high emissions of concern. These are commonly lignites or sub-bituminous coals. The earliest upgrading of high-moisture lignite involved drying and manufacturing of briquettes.
What is the lowest grade of coal?
Lignite
Lignite: Lignite coal, aka brown coal, is the lowest grade coal with the least concentration of carbon. Lignite has a low heating value and a high moisture content and is mainly used in electricity generation.
How can you tell the quality of coal?
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.
Which is the lowest grade of coal?
What is the superior quality of coal called?
Anthracite
Complete answer: So, the superior quality coal is called Anthracite.
What are the different grades of coal in India?
| Grade of Coal | Range of Gross Calorific Value In Kilo Calories |
|---|---|
| G4 | Greater than 6100 and Less than 6400 |
| G6 | Greater than 5500 and Less than 5800 |
| G8 | Greater than 4900 and Less than 5200 |
| G10 | Greater than 4300 and Less than 4600 |