Different Types of Coal

Peat coal, lignite coal, Sub-Bituminous coal, Bituminous coal, Semi-Bituminous coal, Semi-Anthracite coal, Anthracite coal and Super Anthracite coal are the different types of coal.

Peat Coal:

Peat coal contains high moisture and a small percentage of volatile matter and % of Carbon. It is Wet used in power plant. It has very less heating value of 2393 KJ/Kg.

Lignite Coal:

• Lignite coal has fixed carbon moisture content 30 to 45%.
• Proper storage is required to spontaneous combustion.
• Used in power plants locally. It can not be transported.
• woody clay like appearances. Heating value is 13800 to 17585 KJ/Kg.

Sub Bituminous coal

• Sub Bituminous coal can be stored carefully.
• There is no woody structure.
• It is called black ignite.
• Moisture content 17 to 20%.
• volatile matter 35 to 45%.
• Heating value 18840 t0 23000 KJ/Kg.

Bituminous coal:

• Bituminous coal has Low moisture percentage.
• Low or high Ash percentage
• It can be a caking, cooking or free burning coal.
• Heating value s 23,000 to 34750 KJ/Kg.

Semi-Bituminous coal:

• Semi-bituminous coal has high fixed carbon
• Volatile matter 14% to 22%.
• Heating value 33,500 to 34,750 KJ/Kg.

Semi Anthracite Coal:

• Semi anthracite coal is harder than Bituminous coal
• Heating value 33,500 to 34,750 KJ/Kg.
• Costly for power generation.

Anthracite coal:

• Purest form
• High carbon content.
• Less heating value
• Less ash
• Scars
• Less calorific value.

Super Anthracite coal:

• Heat coal, with shining black surface
• A high percentage of Carbon.
• Very difficult to ignite.