基于氮气吸附-核磁共振分析的煤气化细渣孔隙结构特征  

Pore structure of coal gasification fine slag based on nitrogen adsorption and nuclear magnetic resonance analysis

作　　者：于伟[1,2] 刘莉君 高博[3] 王丽娜 岳双凌[2] YU Wei;LIU Li-jun;GAO Bo;WANG Li-na;YUE Shuang-ling(School of Chemistry and Chemical Engineering,Xi’an University of Science and Technology,Xi’an 710054,China;School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China;Shaaxi Coal Industry New Energy and Coal Preparation Technology Co.Ltd..,Xi’an 710100,China)

机构地区：[1]西安科技大学化学与化工学院,陕西西安710054 [2]西安交通大学能源与动力工程学院,陕西西安710049 [3]陕西新能选煤技术有限公司,陕西西安710100

出　　处：《燃料化学学报》2022年第8期966-973,共8页Journal of Fuel Chemistry and Technology

基　　金：国家重点研发计划(2020YFC1910000);陕西省自然科学基础研究计划项目(2021JLM-15)资助。

摘　　要：本研究以宁夏地区煤气化细渣为研究对象,通过低温氮气吸附-脱附、扫描电镜以及低场核磁共振对不同粒度级产品孔隙结构进行了表征与分析。孔隙形态以裂缝形为主,各粒级产品BET比表面积较大,为125.78-589.78 m^(2)/g,扫描电镜分析表明,BJH孔径与实际相差较大,仅以低温氮气吸附法分析孔隙结构具有一定的局限性。低场核磁共振法表明,各粒度级产品孔径均含有微孔、过渡孔、中孔和大孔,总孔隙度均在27%左右,以中孔、大孔为主,微孔次之,过渡孔较少。该种孔隙结构表明煤气化细渣不同粒度级产品均具有一定的吸附性能,但中大孔为水分的主要储存空间,导致脱水困难。The pore structure of coal gasification fine slag in Ningxia was characterized and analyzed by low temperature nitrogen adsorption, scanning electron microscope and low field NMR. The pore morphology is mainly fracture shape, and the BET specific surface area of each particle size is large, which is 125.78-589.78 m^(2)/g. The SEM analysis shows that the BJH pore diameter is quite different from the actual situation, and the analysis of pore structure only by low-temperature nitrogen adsorption method has certain limitations. The low field NMR method shows that the products pore sizes of all particle sizes contain micropores, transition pores, mesopores and macropores, and the total porosity is about 27%, mainly mesopores and macropores, followed by micropores and transition pores. The pore structure shows that the products of different particle sizes of coal gasification fine slag have certain adsorption properties, but the medium and large pores are the main storage space of water, resulting in difficulty in dehydration.

关 键 词：煤气化细渣 孔隙结构 低温氮气吸附 扫描电镜 低场核磁共振 

分 类 号：X752[环境科学与工程—环境工程]