CHN Energy Shendong Coal Technology Research Institute
School of Chemical Engineering and Technology, China University of Ming and Technology

为进一步降低低阶末煤的水分,在分析低阶煤末煤水分赋存特征的基础上提出气流-离心协同强化脱水的技术思路。采用低场核磁共振、BET研究了低阶煤水分赋存特征,搭建了气流-离心场脱水试验平台,研究了力场环境和气流性质对末煤各粒度级孔隙水分脱除效果的影响规律和特征。结果表明:原料孔隙发达,以墨水瓶型和狭缝平板型中孔为主,水分主要赋存在中、微孔中,大孔中水分占比33.95%。单一离心力场可将产品水分降低至15.47%,且随着粒度减小,水分降幅逐渐降低,粗颗粒脱水效果优于细颗粒,主要脱除样品表面水分,大孔水分小幅降低;气流-离心场协同的情况下,表面水和68.08%大孔水分被脱除,末煤水分降低至13.08%,随着粒度减小,水分降幅逐渐升高,细颗粒表面水分充分脱除。气流-离心场协同脱水效果显著,气流主要通过打通、扩展物料层间的脱水通道和热效应有效脱除颗粒表面水与大孔水。

In order to reduce the moisture content in fines of thermal coal, a new approach was explored based on the characteristics of moisture occurrence in coal fines. The characteristics of moisture occurrence in low-rank coal were analyzed using nuclear magnetic resonance (LF-NMR) and Brunauer-Emmett-Teller (BET) techniques. An experimental setup for airflow-centrifugal field dewatering was developed to examine the effects and characteristics of the force field environment and airflow properties on the dewatering efficacy for coal fines, across different particle sizes and for pore water. The experimental result indicated that the feedstock possesses developed porosity, predominantly consisting of ink - bottle and slit - plate mesopores, with moisture chiefly located in mesopores and micropores, and 33. 95% share of moisture in macropores. A solitary centrifugal force field could reduce product moisture to 15. 47%, and the extent of moisture reduction gradually decreases with particle size diminishing, indicating superior dewatering performance for coarser particles, primarily removing surface water and marginally reducing macropore water. In the scenario of synergistic dewatering with an airflow-centrifugal field, both surface water and 68. 08% of macropore water were eliminated, reducing the moisture content in coal fines to 13. 08%. With particle size decreasing, the reduction extent of moisture content progressively increased, with surface water being thoroughly removed. The synergistic dewatering effect of the airflow-centrifugal field is pronounced, with airflow chiefly facilitating the removal of particle surface water and macropore water by opening and enlarging the dewatering pathways between material layers and through thermal effects.

国家科技支撑计划项目(2014BAB01B00)

陈凡,宋文革,肖雄,等.基于水分赋存的气流-离心场协同强化低阶煤脱水研究[J].煤炭工程,2025,57(1):188-194.