褐煤高含水造成利用效率低，干燥是提高能效的重要途径。由于热稳定性较差，褐煤干燥生成大量细粉，难以保证生产安全性和连续性，是遏制褐煤干燥技术发展的难点之一。本项目针对褐煤非均质多孔液固结构的物性特征，以物性认知-力学响应-交互作用-碎裂机制-过程调控为思路，围绕受热过程褐煤非均质结构诱导热湿-应力双向耦合非线性演化和可变温度场褐煤多孔液固结构损伤力学响应及多因素交互作用机制两个关键科学问题开展研究。研究干燥过程褐煤复杂多孔结构水-汽-气传递机制，阐明多相传递的孔结构破坏行为；探析非稳态干燥过程非均质结构热湿应力模型及演化特征，构建干燥过程非均质结构应力响应机制；揭示褐煤非均质多孔液固结构的受热碎裂多因素交互作用，探寻不同干燥阶段褐煤受热碎裂应力临界值及关键控制因素；建立干燥过程中褐煤非均质多孔液固结构碎裂损伤机制，提出控制褐煤干燥碎裂粉化方法，实现控制褐煤受热碎裂粉化的理论突破和方法创新。

Drying was an effective way to improve the energy utilization efficiency of lignite with high moisture content. Nevertheless, for lignite, due to the thermal stability problem, large amounts of fine particles would be generated in drying, which limited its safety and continuous production, and it was the major barrier of industrial application of lignite drying. Thus, for the anisotropic physical properties of lignite, characteristics of lignite, stress response, interaction, mechanism of fragment and process control would be the major study method to solve the two critical scientific problems, namely, the non-linear coupling between thermal/ mass transfer and drying stress; interaction of multi-factors of the damage of porous liquid-solid structure of lignite under variable temperature field. The research contents will be involved in the mechanism of transfer of liquid- vapor-gas as well as the damage of porous structure in drying, the response mechanism of drying stress of anisotropy structure under variable temperatures and the mechanism of damage and fragment of liquid-solid structure. Illustrate the interaction of different factors that resulted in the overloading stress during drying; investigate the critical factor that lead to the fragment at different drying stages; build the mechanism of damage and fragment in drying; propose the methods of process control of fragment and pulverization; make a breakthrough in the theory of fragment and pulverization during heating.