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, Multidisciplinary
Anmin Wang, Jiawei Huang, Meng Zhao, Yue Liu, Daiyong Cao, Yingchun Wei, Langting Wei
Summary: The effect of vitrinite and inertinite on the pyrolysis of coal was investigated. The results show that increasing vitrinite content accelerates the pyrolysis process and shifts the pyrolysis peak to low temperatures, while increasing inertinite content decreases the maximum mass loss rate. Additionally, higher vitrinite content leads to higher CO2 production, whereas higher inertinite content results in lower CO2 production. These findings provide important theoretical support for coal liquefaction and gasification.
Article
Green & Sustainable Science & Technology
Ning Mao, Hongcun Bai, Chang Geng, Liangliang Meng, Na Li
Summary: Chemical looping combustion (CLC) as a carbon capture technology can achieve efficient coal utilization. This study reveals the changes in micro-structures and reactive behaviors of coal during CuFe2O4 based CLC, showing that CuFe2O4 can promote carbon conversion and vitrinite demonstrates higher reactivity in CLC.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Article
Energy & Fuels
Haichao Wang, Xinghua Shi, Jijun Tian, Jienan Pan, Liping Yao, Xinke Feng
Summary: Research on tectonically deformed coal (TDC) is important for gas outburst prevention and coalbed methane development. This study used XRD, C-13 solid-state NMR, and coal pyrolysis techniques to compare the macromolecular structural characteristics and gas generation properties between weak TDC (WTDC) and strong TDC (STDC). The results show that strong tectonic stress promotes coalification evolution in advance and has an impact on the structure and gas generation potential of coal.
Article
Energy & Fuels
Hualin Lin, Yehan Wang, Shansong Gao, Yuan Xue, Chunyang Yan, Sheng Han
Summary: High inertinite content in raw coal affects oil yield. This study examined the chemical structural characteristics of inertinite of different densities in raw coal. The results showed progressive differences in the number of active breaks of chemical bonds and fragment structures after bond breakage in raw coal, low-density, and high-density inertinite samples.
Article
Energy & Fuels
Tianju Chen, Ke Zhang, Mo Zheng, Shuangxia Yang, Dominic Yellezuome, Ruidong Zhao, Guangrui Liu, Jinhu Wu
Summary: The study investigated the thermal properties of NMH coal pyrolysis at different heating rates using TG-FTIR and GC-MS, finding that volatile species were released more quickly at higher heating rates. The analysis of coal tar revealed that it mainly consisted of phenolic compounds, indicating the potential industrial applications of high heating rates for the thermal conversion of low-rank coal.
Article
Energy & Fuels
Hao Liu, Zenghua Li, Yongliang Yang, Guodong Miao, Purui Li, Guoqin Wang
Summary: This study investigates the effect of low-temperature pre-oxidation on the self-heating of coal. The results show that pre-oxidation significantly reduces the oxidation activity of coal and inhibits the oxidation reaction. The total temperature rise of pre-oxidized coal is inversely proportional to pre-oxidation temperature, duration, and number. Additionally, pre-oxidation leads to a decrease in the content of hydroxyl and aliphatic hydrocarbons, while the content of C-O group and carbonyl group increases. Pre-oxidation weakens the activity of active groups and makes the molecular structure of coal more stable.
Article
Environmental Sciences
Yungang Wang, Li Zou, Huaishuang Shao, Yanyuan Bai, Yang Liu, Qinxin Zhao, Feixiang Li
Summary: Blending sludge into high alkali coal can improve the effectiveness of liquid slagging, but its effect on combustion stability is still debatable. This study investigated the thermal behavior and microscopic properties of HAC and sludge mixtures, and found synergistic effects during co-combustion of HAC and sludge at different ratios.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Energy & Fuels
Yabing Lin, Yong Qin, Dongmin Ma, Zhonghui Duan
Summary: The research focused on the impact of the first coalification jump (FCJ) on the reservoir properties of high-volatile bituminous coal rich in inertinite. Results showed that FCJ affects the adsorption capacity and pore structure of the coal. Langmuir pressure and volume were mainly controlled by the coalification process and macerals, with Langmuir pressure exhibiting a positive linear relationship with the ratio of vitrinite to inertinite.
Article
Geosciences, Multidisciplinary
Katarzyna Czerw, Pawel Baran, Jakub Szczurowski, Katarzyna Zarebska
Summary: Low-pressure sorption tests on Polish bituminous coal samples in coal-methane and coal-carbon dioxide systems revealed a relationship between petrographic composition and gas sorption capacity, especially for carbon dioxide. Langmuir and Dubinin-Radushkevich sorption isotherms were used, showing a preference for carbon dioxide sorption. Hysteresis loop size was found to depend on petrographic composition, increasing with higher vitrinite content for both sorbates.
NATURAL RESOURCES RESEARCH
(2021)
Article
Engineering, Chemical
Jing Chang, Zhen Li, Yanhong Fu, Chao Yang, Wenge Song, Ziqi Zhu
Summary: Research on coal treatment using fine classification and multistage pulverization liberation techniques showed enrichment efficiencies for vitrinite and inertinite components of 16.6% and 55.3%, and 11.8% and 75.4%, respectively. Proposed calculation and process models for the maceral liberation of coal showed outstanding quality improvement and quality-based classification effects.
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
Mining & Mineral Processing
An Ping, Wencheng Xia, Yaoli Peng, Guangyuan Xie
Summary: The study found that inertinite has a lower dewatering rate and higher filter cake moisture compared to vitrinite, with the particles of inertinite breaking more easily into smaller particles forming a more compact filter cake. Vitrinite is more hydrophobic than inertinite, making water drainage from the filter cake easier.
INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY
(2021)
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
Chemistry, Multidisciplinary
Zhifei Liu, Daiyong Cao, Gaojian Chen, Zhongwei Bi, Qingtong Chen
Summary: This study compares the differences in chemical structure between vitrinite and inertinite and their impacts on transformation and utilization. It finds that inertinite has higher aromaticity and ring condensation degree, but vitrinite has a faster evolution rate. The shorter and stronger ether-oxygen bond hinders the breakage recombination of the macromolecular structure. Inertinite shows lower reactivity in coking and gasification processes but has advantages in the preparation of coal-based graphite.