coal classification
According to the degree of coalification, coal could be divided into three categories: brown coal, bituminite, and coal. Hard coal was a general term for bituminite and anthracite. Among them, brown coal was the mineral coal with the lowest degree of coalification. Its ash value was generally between 20% - 30%. It was rich in volatile components, easy to burn and smoke, and the combustion would produce more ash floating in the air. Bituminous coal has a moderate degree of coalification, with a carbon content of 80% - 90%, a hydrogen content of 4% - 6%, and an oxygen content of 10% - 15%. It is relatively black in color, and the dyed hand is black. It is dense and brittle, and the stripes are black. When it burns, it emits thick smoke. According to the volatile content, the thickness of the colloid layer, or the technological properties, it could also be divided into long flame coal, gas coal, fat coal, coke coal, lean coal, and lean coal. The coal with the highest degree of coalification had a high fixed carbon content, the least impurities, low volatile components, and a high ignition point. It was not easy to burn on fire, and the burning flame was not obvious or even non-existent. From the point of view of usage, it could also be divided into thermal coal and so on. The thermal coal was mainly used to generate energy for heating or to drive mechanical movements and then convert it into other energy. In addition, China's coal could be divided into 17 sub-categories, namely, smokeless coal, lean coal, poor-lean coal, lean coal, coke coal, fat coal, 1/3 coke coal, gas-fat coal, gas coal, 1/2 medium-sticky coal, weakly sticky coal, non-sticky coal, long-flame coal, brown coal, etc.
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