Article
Energy & Fuels
Maria Mastalerz, Agnieszka Drobniak, James C. Hower
Summary: The study compared Pennsylvanian coals with coals from other ages, finding that differences in oxygen content and CH2/CH3 ratio are related to the original biomass, while other parameters are influenced by depositional and diagenetic processes.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2021)
Article
Chemistry, Analytical
Qiuxiang Yao, Mingming Ma, Yongqi Liu, Duo Ma, Huiyong Chen, Qingqing Hao, Ming Sun, Xiaoxun Ma
Summary: Different coal macerals have different pyrolysis characteristics, and studying the pyrolysis characteristics of coal macerals is helpful for coal graded utilization. This study focuses on the structural and pyrolysis characteristics of vitrinite (SD-VC) and inertinite (SD-IC) from Shendong coal. The results show that SD-VC has higher enrichment and generates more coal tar during pyrolysis, while SD-VC char has lower graphitization degree and better gasification performance compared to SD-IC char.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2022)
Article
Energy & Fuels
He Zhou, Caifang Wu, Jienan Pan, Zhenzhi Wang, Qinghe Niu, Mingyang Du
Summary: The study examined the macromolecular differences of vitrinite and inertinite with varying degrees of metamorphism. The findings indicated that carbon content increases, while hydrogen, oxygen, and sulfur content decrease as coal rank rises. Additionally, the loss of functional groups results in a more orderly arrangement of coal macromolecules, leading to increased maturity and aromaticity.
Article
Chemistry, Analytical
Shuo Sun, Zhihui Chen, Youqing Wu, Sheng Huang, Yonghui Bai, Shiyong Wu
Summary: This study investigates the blending of different types of coals for coking, and finds that DCLR and QM can partially replace coking coal (FM or JM) with certain limitations. The mechanism of action of DCLR and QM is explored, and it is found that they can modify the temperature range of interaction between metaplast and gas in the coking system, thereby increasing the thermal strength of coke.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2022)
Article
Chemistry, Multidisciplinary
Jian Wu, Dun Wu, Xia Gao, Bo Li
Summary: The evolution characteristics of organic molecular structure during coal metamorphism were analyzed using EPR testing. It was found that magma intrusion and stratigraphic tectonic movement can deepen the metamorphic degree of coal. The relationship between EPR parameters and vitrinite reflectance showed a quartic polynomial distribution, with changes in EPR parameters fluctuating in a phased and stepwise manner as the reflectance increased. High-rank and medium-rank coals exhibited significant differences in the distribution of EPR parameters during organic evolution.
Article
Green & Sustainable Science & Technology
Xiangyu Zhuo, Jinshui Su, Huilong Xu, Lei Wang, Wenfeng Wang, Bo Zhang, Zhonghai Ni
Summary: The removal of Na and enrichment of vitrinite in low-rank Zhundong coal is crucial for its efficient and clean utilization. The addition of low concentration HCl and AcOH significantly increases the vitrinite content and clean coal yield during the flotation process, with a comprehensive efficiency improvement of over 70%.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Energy & Fuels
Liza K. Elliott, Terry F. Wall
Summary: The impact of macerals and their pyrolysis behavior on pulverized coal injection (PCI) combustion in blast furnaces is unclear. The study found that coal's combustibility is related to its volatile content, as well as influenced by the density of macerals and the graphitic nature of resulting chars.
Article
Geosciences, Multidisciplinary
Hewu Liu, Chenliang Hou, Yu Song
Summary: This study conducted molecular dynamics simulations of vitrinite nanoindentation and found that during the indentation process, vitrinite molecular chains undergo sliding, bending, and reorientation, leading to the formation of a shearing transformation zone. It also showed that molecular dynamics simulations are an effective tool for studying coal nanoindentation.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Energy & Fuels
Jieping Wang, Lu Tian, Guangyue Li, Xiaohui Zhao, Yinghua Liang, Jianglong Yu
Summary: This study investigated the correlation between molecular structures and thermoplastic properties of vitrinite from different bituminous ranks, revealing that cyclic aliphatic structures play a significant role in fluidity development and caking properties. Advanced analytical techniques, combined with theoretical methods, were used to establish molecular models of vitrinite samples, providing comprehensive structural information.
Article
Energy & Fuels
Yaru Zhang, Jinfeng Bai, Xiangyun Zhong, Lijun Jin, Yang Li, Haoquan Hu
Summary: The study demonstrates the use of RFMI obtained from the modified FAMM technique in evaluating coking coal, showing a linear correlation with vitrinite reflectance and increased sensitivity to coking properties. This can serve as a powerful supplement to existing coal evaluation standards.
Article
Geosciences, Multidisciplinary
Rongfang Qin, Lu Wang, Daiyong Cao, Anmin Wang, Yingchun Wei, Jing Li
Summary: The study revealed significant differences in the chemical structure evolution of vitrinite and inertinite during coalification. The structure parameters of inertinite were consistently larger than vitrinite, while certain parameters were consistently smaller in inertinite compared to vitrinite.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Engineering, Chemical
Dibyajyoti Behera, Barun Kumar Nandi
Summary: This study investigates the combustion characteristics of coal particles with varying average specific gravity. Experimental results demonstrate significant changes in coal properties and combustion characteristics as the ASG of coal increases.
Article
Geochemistry & Geophysics
Ruiqing Li, Yuegang Tang, Qili Che, Pengliang Ma, Peng Luo, Xin Lu, Min Dong
Summary: This study prepared coal-based graphene from raw coal samples and characterized its properties. The results provide insights into the relationship between the graphitization degree of coal-based graphite and the reflectance of raw coal, as well as the correlation between the crystallite width and height of graphite and graphene and the reflectance of raw coal.
Article
Energy & Fuels
Wenping Jiang, Xiaozhong Song, Lingwen Zhong
Summary: This study analyzed the optical characteristics of different coal samples with coal texture and studied the relationship between the vitrinite maximum reflectance and the characteristics of tectonic stress. The results showed that the optical anisotropy of coal increases with the increase of coal grade. The analysis of Ferrin diagram also revealed the influence of different geological structures on coal deposits in the mining area.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2022)
Article
Energy & Fuels
Xiaohe Xiong, Yang Miao, Xuchao Lu, Houzhang Tan, Zia Ur Rahman, Peng Li
Summary: Different hydrocarbon species in coal pyrolysis gases have the potential to reduce NOx emissions. Alkanes yield in the gases is positively related to coal volatiles. Under different heating conditions, the generation behavior of alkanes differs from that of olefins and alkynes, with the yield varying with pyrolysis temperature.
