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What is the form of moisture in coal? What are their respective characteristics?
What is the form of moisture in coal? What are their respective characteristics?
1) External moisture? It refers to the water adhered and wetted on the surface of coal blocks and in the holes of large capillary tubes (diameter>10-5 cm). It is mechanically stored in coal. When coal is in the air, this water will continuously evaporate. Its content is related to the external conditions, with the symbol Mf; (2) Intrinsic moisture? The moisture adsorbed or condensed in the small pores inside coal particles is physically and chemically bound to coal and can only be removed at a temperature of 105-110 ℃, with the symbol Minh; (3) Crystal water? It is the moisture that combines with three substances in coal, and it can only be decomposed at temperatures above 200 ℃. Industrial analysis cannot be used for determining crystalline water.