关键词: 煤炭, 机械制样, 全水分损失, 校正公式

Abstract: The total moisture loss of coal sample is quite common in the mechanical preparation process. In this paper, the factors influencing the total moisture loss are analyzed. Through the significance test, the total moisture loss of mechanical coal sample is evaluated. The results of coal sample total moisture test show that, compared with the sample from artificial preparation which is free of significant total moisture loss, certain bias are introduced into mechanical sample preparation. In order to make the coal sample from mechanical sample preparation consistent with the actual situation, the mathematical model with the correction of the total moisture loss in mechanical sampling is established and tested by one-dimensional linear regression method based on the artificial sampling datum. The model can be used for bituminous coal and anthracite coal with the total moisture of more than 6%, but the modifications of coefficients in the model are needed depending on the exact mechanical sample preparation system.

Key words: coal, mechanical sample preparation, total moisture loss, correction formula