Sticking coal should be related to coal type. Coal with low metamorphic degree is easy to be oxidized, that is, bonded, but oxidation only occurs on the surface of coal. If only the surface coal sample is taken when sampling, the gap is definitely large. In addition, some coals have low ignition point, which is also the cause of coal sticking.

Coal is combustible, and oxidation reaction will occur during transportation and storage, so it is necessary to avoid falling tons (weight reduction) and sticking (calorific value reduction) too seriously.

The moisture in coal is divided into total moisture and internal moisture. Total moisture (Mt) is the sum of external moisture (Mar) and internal moisture (mad). The so-called external water refers to the moisture reduced by means of drying and drying, and the internal water refers to the moisture between the molecular structures of raw coal. Generally speaking, the internal moisture is determined by the nature of the coal mine itself, and you can't change it except the occurrence. You should pay attention to rainproof and waterproof measures to control the external moisture. At the same time, excessive external moisture will seriously affect the receiving base calorific value (Qnet, ar) of coal, and every 1% moisture will affect about 70 kcal. It is suggested that you pay attention to the above principles in future contract agreements and coal mine selection.