Explanation:
Option 1 is correct, i.e. Anthracite.
- Anthracite, also called the hard coal is a highly metamorphosed form of coal.
- The calorific value of a substance is defined as the amount of heat released by a unit weight of a substance during complete combustion.
- Anthracite coal has the highest calorific value.
Anthracite is a type of coal that has the highest carbon content.
- Anthracite: 87-96%
- Bituminous: 45-86%
- Lignite: 25 - 35%
|
Coal |
Specifications |
|
Anthracite |
The highest rank of coal. It is a hard, brittle, and black lustrous coal, often referred to as hard coal, containing a high percentage of fixed carbon and a low percentage of volatile matter. |
|
Lignite |
Lignite coal, brown coal, is the lowest grade coal with the least concentration of carbon |
|
Bituminous |
Bituminous coal is middle-rank coal between sub-bituminous and anthracite. Bituminous usually has a high heating (Btu) value and is the most common type of coal used in electricity generation. Bituminous coal appears shiny and smooth when you first see it but look closer and you may see it has layers. |
|
Peat |
Peat is not actually coal, but rather the precursor to coal. Peat is a soft organic material consisting of partly decayed plant and, in some cases, deposited mineral matter. When peat is placed under high pressure and heat, it becomes coal. |
Extra information:
- The most common volatile matter in coal is water, carbon dioxide, and sulfur dioxide.
- Volatile matter is directly related to coal rank; as coal rank increases, volatile matter content decreases.
- Peat has the highest volatile matter.
