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介绍了空气重介流化床选煤技术的基本原理和特点。在揭示煤的外在水分基本分布规律的基础上，分析研究水分对空气重介流化床选煤过程的诸多影响因素，指出适合于该技术应控制的最大入料煤外在水分。
The basic principles and characteristics of air-heavy fluidized bed coal preparation technology are introduced. On the basis of revealing the basic distribution rules of external moisture in coal, many influencing factors on the coal preparation process of air Dense Medium Fluidized Bed are analyzed and discussed, and the maximum external moisture content of feed coal suitable for this technology is pointed out.