Lean coal belongs to the energy short-flame brands. It is sometimes called semi-anthracite, because in its characteristics it approaches anthracite – coal with the highest degree of metamorphism. Mark T is mined in the Kuznetsk and Pechora basins. ...
The skinny brand of coal has 2 groups: The first skinny (1T). The second one is skinny (2T).
Lean coal belongs to the energy short-flame brands. It is sometimes called semi-anthracite, because in its characteristics it approaches anthracite – coal with the highest degree of metamorphism. Mark T is mined in the Kuznetsk and Pechora basins.
It is a material of a homogeneous structure, more often black in color with a matte sheen (while the gloss of coal increases with an increase in ash content). Its strength is small, the coal is brittle and quickly splits on impact. Therefore, when mining a skinny variety, a lot of small things are formed. The density of the material is quite high, the porosity is insignificant.
When burning lean coal, a lot of heat is generated. It burns with a low white flame, does not bake, the pieces are covered with light ash. After combustion, fine loose coke remains in the furnace, which quickly crumbles into powder.
The main characteristics of lean coal:
• Carbon content – 88-92%
• Heat of combustion – 7300-8800 kcal
• Density – 1340 kg/m3
• Porosity – 10-15%
• Humidity – 1-7%
• Ash content – 8-25%
The brand is used in industrial boilers and thermal power plants, as well as in the production of cement. This variety can also be used in domestic boilers. In this case, the furnace should be equipped with a blowdown, since dense rock does not ignite well.
Some of the lean coal goes to the needs of metallurgy. This brand is added to the coke charge as a thinning element. The material is not sintered on its own.
The skinny brand of coal has 2 groups:
• First skinny (1T)
• Second skinny (2T)
Each group is divided into fusinite and vitrinite subgroups:
• The vitrinite subgroup is characterized by the content of vitrinite, a cementing component of coal, which was formed from cellulose and lignin decomposing without oxygen access
• Fusinite is characterized by the content of plant residues that decomposed in the presence of oxygen (as a result, the substance fusinite was formed, in which the fibrous and cellular structure of plants was partially preserved).