What kinds of coal are there? What are their names?
Category: coal is divided into major categories according to the degree of coalification and process performance.Category: a further subdivision of the categories according to the nature and purpose of the coal.The rank of coal, also called the rank of coal.Brown coal: a low degree of coal, the appearance of brown, dark luster, containing a high degree of internal moisture and different amounts of humic acid.In the classification of international coal seams, the low rank coals with high water content and high ash content are equal to or greater than 20 to less than 24MJ/kg.Bituminous coal: coal with a higher degree of coalification than lignite, which is characterized by a wide range of volatile yield, and no coking to strong coking in the case of separate coking.Anthracite: coal of high degree of coalification, low volatile, high density, high ignition point, non caking, no smoke when burning.General: hard coal of bituminous coal and anthracite, or a constant temperature (should be constant) ash free calorific value is less than or equal to or greater than 24MJ/kg24MJ/kg but the vitrinite reflectance is equal to or greater than 0.6%.
According to the classification of coal China, which accounted for 27.65% of the class of non coking coal, coking coal accounted for 72.35%, including the former coal (13.75%), (3.53%) coal, coking coal, lean coal (5.81%) (4.01%), the other is divided into grades of coal (0.55%); the latter includes smokeless coal (10.93%), coal (5.55%), weakly caking coal (1.74%), (13.8%) non caking coal, long flame coal (12.52%), brown (12.76%), natural coke (0.19%), not the grades of coal (13.80%) and grade (coal is not clear 1.06%). Category: coal is divided into major categories according to the degree of coalification and process performance.
Hello "Coal" glad to answer your questions: in the long geological evolution process, coal by various geological factors; due to the difference in coal, coal raw material, reducing the degree and causes types, coupled with the co-existence of various metamorphism, resulting in Chinese coal varieties. China from the low metamorphic degree of lignite to high degree of deterioration of anthracite are stored
