湿黏细粒煤的干法深度筛分理论与技术是当前国际筛分领域的研究热点和难点。其中，筛面易堵孔和筛面寿命短是湿黏细粒煤干法筛分时的核心基础问题。为了掌握当前湿黏细粒煤干法筛分理论及技术的发展现状，分析了2种广泛应用的细粒煤筛分设备：基于等厚筛分理论的等厚筛和基于弛张筛分理论的弛张筛的应用及研究存在的问题，讨论了筛分过程基础理论中颗粒分离机理的研究现状，总结了基于离散元方法(DEM，Discrete Element Method）的筛分过程中有关筛面颗粒流动特性数值模拟研究存在的不足。结果表明：筛分过程基础理论是发展新筛分技术和提升筛分设备设计水平的关键，非球形湿黏颗粒系统的分离行为和筛面高湿黏颗粒流动特性及透筛机理是筛分过程基础理论的关键问题，利用基于DEM的数值方法可以实现从颗粒尺度深入研究筛分过程中非球形湿黏颗粒的有关运动行为。此外，阐述了交叉筛的结构特点及筛分过程机理，总结了国内外有关交叉筛技术的应用及研究现状，分析了交叉筛的筛分过程基础理论研究的不足，以及存在缺少交叉筛关键结构及工艺参数的优化设计理论和方法的主要问题，提出了基于筛面-颗粒耦合模拟的交叉筛分过程机理、交叉筛结构轻量化设计及节能优化控制等研究展望。

The theory and technology of dry depth screening of wet-cohesive fine-grained coal is the current research hotspot and difficulty in the international screening field. The easy blocking of the screen aperture and the short life of the screen deck are the two core basic problems in dry screening of wet cohesive fine coal. In order to grasp  the current development status of dry screening theory and technology of wet cohesive fine coal, the problems in application and research of two types of widely used screening equipment of fine coal are analysed: equal thickness screen based on equal thickness screening theory and flip-flow screen based on flip-flow screening theory. Then, the research status of particle separation mechanism in the basic theory of the screening process is discussed. And, the shortcomings of DEM (Discrete Element Method) based numerical simulation of particle flow characteristics in the screening process are summarised. The results show that the basic theory of the screening process is the key to developing new screening technology and improving the design level of screening equipment. The separation behaviour of non-spherical wet-cohesive particles system, the flow characteristics of high wet-cohesive particles on the screen deck and the mechanism of penetration are the key issues of the basic theory of the screening process. The DEM-based numerical method can be used to further study the motion behaviour of non-spherical wet-cohesive particles in the screening process from the particle scale. Moreover, the structure characteristics and screening process mechanism of cross-screen are described. The application and research status of cross-screen technology both at home and abroad are summarised. The shortcomings of the basic theoretical research on the screening process of the cross-screen are analysed. And the main problems of the lack of optimisation design theory and method of key structure and process parameters of the cross-screen are pointed out. The research prospects of the cross-screening process mechanism based on screen surface-particle coupling simulation, the lightweight design of the cross-screen structure and the energy-saving optimisation control are proposed.