This study is conducted to study about the document review:On the classification of geological samples Study of the related research documents of English edition of Thai 5 5 original between 19962547 - 2557 include a 10 original study. From the review of research on the classification of geological samples of coal found factors analyzed were popular Moisture content of coal,The chemical composition of the coal, the calorific value of coal The above factors to analyze the quality of coal, coal quality is good or not. And the factors affecting the quality of coal have 2 factor is
.- the depth of rock and geological time
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. Structural abnormalityIt can be seen that the structure or source of coal on quality and composition of coal ดังการศึกษา of National Coal Quality. Inventory (NaCQI) concluded that coal in each region are the only difference.Because coal is the energy source that the cost is low. It is the sources of energy with the quantity accumulate enough to be processed into the energy we use.
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