摘要
宁东煤炭储量可观,基于双碳背景的煤低碳高效利用是宁东煤面临的重要转型问题。对煤微观结构的正确认识是煤炭低碳高效清洁利用的关键。选用宁东典型矿区煤的5种煤作为研究对象,利用X射线衍射(XRD)、红外光谱(FTIR)、拉曼光谱(Raman)等现代仪器光谱技术对宁东煤的微观结构进行分析。在此基础上建立宁东煤的简化结构特征。结果表明:不同煤种之间分子结构的差异主要存在于连接碳层结构的脂肪碳和碳层结构的尺寸;随着H/C的增加,煤中碳层结构上的脂肪链I_(2)增加,微晶碳层横向尺寸L_(a)降低,微晶结构发生缩聚反应,使得碳层间距d_(002)增大,层高L_(c)降低。宁东煤的分子结构可简化为由短程碳层构成,这些小尺寸的碳层通过无定形或脂族碳连接。X衍射数据的γ峰可计算碳层间无定形碳或脂族碳相对含量1/f_(a),002峰可计算碳层结构层间距d_(002)和层高L_(c);拉曼结构参数可计算碳层的横向尺寸L_(a);红外结构参数可计算悬挂在碳层上官能团相对量I_(2)。上述研究结果为宁东煤炭资源低碳清洁高效的开发利用提供理论基础。
Ningdong coal reserves are considerable,and the low-carbon and efficient utilization of coal based on the dual-carbon background is an important transformation problem f_(a)cing Ningdong coal.The correct understanding of the coal micro-structure is the key to the low-carbon,efficient and clean utilization of coal.In this paper,five kinds of coal in Ningdong typical mining area are selected as the research object,using X-ray diffraction(XRD),infrared spectrum(FTIR)and other modern instrument spectroscopy to analyze the microstructure of Ningdong coal(Raman).On this basis,the simplified structure characteristics of Ningdong coal are established.The results show that the difference in molecular structure between different coal species mainly exists in the size of f_(a)t carbon and carbon layer structure;with the increase of H/C,the f_(a)t chain(I_(2))on the carbon layer structure in coal increases,the transverse dimension(L_(a))decreases,the condensation reaction makes the carbon layer spacing(d_(002))increases and the height(L_(c))decreases.The molecular structure of Ningdong coal can be simplified to consists of short-range carbon layers,whose small sizes are connected by amorphous or aliphatic carbon.The peak of the X diffraction data calculates the relative amorphous or aliphatic carbon content(1/f_(a)),the peak 002 calculates the layer spacing(d_(002))and layer height(L_(c)),the Raman structure parameters calculate the transverse dimension(L_(a)),and the infrared structure parameters calculate the relative amount of functional groups hanging on the carbon layer(I_(2)).The above research results provide a theoretical basis for the low-carbon,clean and efficient development and utilization of coal resources in Ningdong.
作者
赵俊平
周维国
祝朝阳
陈栓俊
ZHAO Junping;ZHOU Weiguo;ZHU Chaoyang;CHEN Shujun(Guohua(Ningxia)New Energy Co.,Ltd.,Yinchuan 753000,China;State Grid Energy Hefeng Coal Power Co.,Ltd.,Tacheng 834411,China)
出处
《洁净煤技术》
CAS
CSCD
北大核心
2023年第S02期29-34,共6页
Clean Coal Technology
关键词
热解
热重质谱联用技术
热解机理
宁东
pyrolysis
thermal and heavy mass spectrometry combined technology
pyrolysis mechanism
Ningdong
