褐煤中煤-水间的相互作用及界面稳定性机理

Aimming at the basic science problem in the process of dehydration upgrading and efficient utilization of lignite, coal-water interaction and interface stability mechanism of lignite, MengDong old lignite is selected as research object in the project. The main study route is analyzing deeply the chem-physical functional mechanism between water and gel-like structure formed from the oxygen functional groups, capillary pore structure and electrolytic in lignite. From the aspect of phase transition and low temperature pyrolysis of lignite, the multi-dimensional complicated stucture feature of lignite will be analysed using a variety of characterization means. The effect of the destruction mode and degree upon the lignite structure on the interface stability will be studied deeply through processing lignite using many methods. The coal-water chem-physical interaction and interface stability mechanism of lignite will be clarified from molecular level through theoretical calculation. The analog computation platform about fundamental research of lignite will be improved and developed. The study results will solve dehydration and stability problems from the source and provide theoretical basis for large-scale dehydration upgrading and efficient utilization.

针对褐煤脱水提质和安全、高效利用的基础科学问题----褐煤中煤-水间相互作用及界面稳定性，本项目以蒙东地区年老褐煤为研究对象，以褐煤中含氧官能团、孔隙结构、煤中电解质的交互作用及其与水的物理化学作用为研究主线，从褐煤的相变和低温热解两个角度出发，采用多种表征手段剖析褐煤的多维复杂微观胶体结构特征；采用多种方法处理褐煤，深入研究破坏胶体结构方式和程度对褐煤界面稳定性的影响；结合理论计算，从分子水平揭示水、煤之间复杂的物理化学作用以及提质褐煤煤-水界面稳定机理，完善和发展褐煤基础研究和理论计算的平台。从源头上解决褐煤脱水和稳定性问题，为褐煤大规模脱水提质、高效安全利用提供理论依据。

针对褐煤脱水提质和安全、高效利用的基础科学问题----褐煤中煤-水间相互作用及界面稳定性，本项目以蒙东地区年老褐煤为研究对象，以褐煤中含氧官能团、孔隙结构、煤中电解质的交互作用及其与水的物理化学作用为研究主线，从褐煤的相变和低温热解两个角度出发，阐明褐煤中水的赋存状态及其与煤结构的相互作用，以及脱水难度和煤结构变化的关系；明晰了褐煤中水分的赋存、迁移和焓变规律以及离子种类、离子浓度、含氧官能团、孔隙大小对其影响；获得金属离子束水能力排序，阐明了热解产物的组成及含氧官能团对界面稳定性的影响；揭示影响褐煤的界面稳定性的关键因素；提出基于多种表征信息构建褐煤大分子骨架模型的方法，揭示褐煤中煤-水间的物理化学作用规律、持水结构以及影响界面稳定性的根本原因。从源头上解决褐煤脱水和稳定性问题，为褐煤大规模脱水提质、高效安全利用提供理论依据。