Dry basis of coal

In coal quality analysis, \"on a dry basis\" is a method for analyzing coal quality. "\"Dry basis\" refers to the composition of coal in the absence of moisture, that is, the composition after the moisture has been removed from the coal sample. This is because the moisture contained in coal does not generate heat; therefore, when analyzing coal quality, the effect of moisture is usually ignored. In practice, the \"dry basis\" is achieved by drying the coal sample at a certain temperature until its weight no longer decreases; at that point, it can be assumed that all the moisture in the coal sample has been removed, and the sample is then in its \"dry basis\" state. By then analyzing the \"dry basis,\" the composition of coal free from moisture can be obtained. This method can provide more accurate coal quality data, as it eliminates the influence of moisture. For example, if we want to know the contents of elements such as carbon, hydrogen, nitrogen, and sulfur in coal, we can use \"dry basis\" analysis. .

This post was last edited by wangguomin on 2023-10-18 at 14:58. An anhydrous form refers to one that contains no water. For example, if the external moisture content of coal is 18.5%, then its dry basis amount is its weight * 88.5%.

This post was last edited by wangguomin on 2023-10-18 at 15:03. 1. Coal-on-base: Based on the coal as it is received; Coal condition: The state of the coal at the time it is received. Components of coal: Surface moisture, air-dry basis moisture, ash, volatile matter, fixed carbon. 2. Air-dry basis: Condition: Burning when in equilibrium with ambient humidity; Components: Air-dry basis moisture, ash, volatile matter, fixed carbon. 3. Dry basis: Condition: Hypothetical coal after drying at 105 degrees; Components: Volatile matter, ash, fixed carbon