| 摘要 |
PURPOSE:To facilitate operation control and enable reduction in partial pressure of steam in discharge gases from a cooling step, by dividing a gas circulation system into a predrying.quick heating step and cooling step in a dehydrating and drying process of low-grade coal. CONSTITUTION:Coal, such as brown coal or subbituminous coal, with a low carbon content, high value of equilibrium moisture content and high moisture absorbing property is dehydrated and dried. In the process, a gas circulation system is divided into two systems of a predrying.quick heating step and cooling step to prevent circulation of a gas from the cooling step through the predrying or quick heating step.
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