Article
Chemistry, Physical
Zhonghua Du, Wu Li
Summary: In this study, the pyrolysis characteristics of tar-rich coal were investigated using TG-MS-FTIR. It was found that there were two stages of mass loss in the pyrolysis process and the gas release signal detected by mass spectrometry was consistent with the functional group information detected by FTIR. The main gaseous products included H-2, H2O, CO, CO2, and CH4.
Article
Energy & Fuels
Dongdong Feng, Dawei Guo, Qi Shang, Yijun Zhao, Linyao Zhang, Xin Guo, Jian Cheng, Guozhang Chang, Qingjie Guo, Shaozeng Sun
Summary: This study delves into the thermal behavior and evolution profiles of major volatile fragments from three types of biomass pyrolysis, revealing that high temperature promotes tar to soot conversion and the insertion of O atoms increases soot's microcrystalline structure size. Inherent metal species can inhibit soot formation.
Article
Chemistry, Analytical
Qiuxiang Yao, Mingming Ma, Yongqi Liu, Lei He, Ming Sun, Xiaoxun Ma
Summary: The study investigates the effects of ion-exchanged metal cations on the pyrolysis reactivity of coal and gasification performance of pyrolysis chars. Results show that ion exchange of Co2+ and Ni2+ increase coal tar yields, while alkali and alkaline earth metal cations promote the formation of naphthalene in coal tar. The catalytic effect of these metal cations on coal pyrolysis is in the order Na+ > K+ > Ni2+ > Ca2+ > Mg2+ > Co2+.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2021)
Article
Thermodynamics
Dun Li, Jianmin Gao, Qian Du, Ziqi Zhao, Heming Dong, Zhaoyang Cui
Summary: The physical and chemical characteristics of soot samples obtained from coal and coal mixed with iron nitrate pyrolysis were studied. It was found that iron nitrate significantly reduced the yield of soot and decreased the sizes of the primary soot particles. Moreover, the addition of iron resulted in more graphitized carbon lamellae in soot and increased surface roughness of the primary particles, as well as the presence of more aliphatic functional groups and C-O on the soot surface.
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
Thermodynamics
Zhao Lei, Qijun Liang, Qiang Ling, Ping Cui, Zhigang Zhao
Summary: The generation mechanism of light tar during Shenfu bituminous coal pyrolysis was investigated using a combination of TGA, Py-GC/MS, TGA-FTIR, and ReaxFF simulations. The study showed that the pyrolysis process involved activation, pyrolysis, and condensation stages, with the initiation of coal pyrolysis attributed to the cleavage of oxygen-containing groups. The reaction mechanism of light tar was identified as free radical addition reaction, primarily deriving free radicals from the cleavage of C-O chemical bonds.
Article
Chemistry, Analytical
Ben Niu, Ruichun Liu, Juntao Zhang, Runkun Shi, Hanbin Zhong, Jiaofei Wang
Summary: This study investigated coal pyrolysis in O-2/CH4 atmosphere using an atmospheric fixed-bed reactor. It was found that the addition of O-2 to CH4 can enhance tar formation, with significant effects on tar yield, fraction distribution, and composition. The results show that the addition of O-2/CH4 as pyrolysis atmosphere can improve the content and distribution of various components in tar compared to CH4 and N-2 atmospheres.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2021)
Article
Energy & Fuels
Ziqi Zhao, Qian Du, Dun Li, Heming Dong, Jianmin Gao, Haibo Li, Yu Zhang
Summary: This study investigates the effects of Na on the characteristics of coal-derived soot. It was found that the presence of Na can alter the microstructure and physicochemical properties of soot, and promote its transformation into functional materials.
Article
Chemistry, Analytical
Qinlin Yang, Qiuxiang Yao, Duo Ma, Yongqi Liu, Lei He, Ruishi Zhou, Ming Sun, Xiaoxun Ma
Summary: The catalytic co-pyrolysis of coal and hydrogen-rich substances can improve the yield and quality of coal tar. This study investigated the effects of hematite, chalcopyrite, nickel laterite, and molybdenite catalysts on the product distribution of coal-tar slurry. The addition of catalysts reduced the apparent activation energy of the pyrolysis process and promoted the generation of oxygen-containing compounds and aromatics. The presence of natural minerals enhanced the formation of light tar.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(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.
Article
Energy & Fuels
Hang Zhou, Josh McConnell, Terry A. Ring, James C. Sutherland
Summary: A method is proposed to determine the gas-phase fuel streams in coal combustion, which is then applied to identify the required dilution rate needed to achieve MILD coal combustion. By analyzing reaction rates and temperature profiles, temperature criteria for MILD coal combustion can be obtained.
Article
Thermodynamics
Yanpeng Ban, Lijun Jin, Kechao Wang, Yang Li, He Yang, Haoquan Hu
Summary: The effect of carbide slag (CS) on the pyrolysis behavior and product distribution of low-rank coal was investigated. It was found that CS impregnation significantly affected the coal pyrolysis products, making the tar lighter and reducing the pitch content. In-situ Py-VUVPI-MS analysis revealed that the decrease in benzenes and phenols content was due to the secondary reaction of primary products catalyzed by calcium in CS, and the change of reaction path of oxygen-containing structure in coal caused by calcium catalysis.
Article
Engineering, Geological
Yang Ju, Yan Zhu, Yuwei Zhang, Stefan Iglauer, Bin Pan, Kai Wang
Summary: British Petroleum predicts that coal will continue to be the largest source of energy for power generation until 2040, and the U.S. Energy Information Administration forecasts that coal will remain an important component of the country's electricity portfolio until at least 2040. However, due to serious environmental and safety issues associated with traditional coal mining and utilization, there is an international call for the abandonment of coal use and the adoption of renewable resources. To address these concerns, a novel approach using in situ conversion and power generation from subsurface coal has been proposed and studied. This work contributes to cleaner energy production and energy security.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2023)
Article
Energy & Fuels
Yifan Wu, Yu Zhang, Jiankun Zhuo, Qiang Yao
Summary: This study investigated the influence of ion-exchangeable calcium on the properties of carbonaceous particulate matter from coal pyrolysis. It was found that ion-exchangeable calcium reduced the soot yield and inhibited the size growth of soot particles. Transmission electron microscopy analysis showed that ion-exchangeable calcium decreased the sizes of disordered cores in soot particles, accelerated the graphitization of soot, and made the soot aggregates more compact. Chemical analysis revealed that the graphitization degree of the soot was first enhanced and then inhibited with increasing calcium loading. Furthermore, the study characterized the inorganic species in the size-segregated soot particles and found that the fractions of calcium and sodium exhibited different trends with particle size.
Article
Chemistry, Physical
Valentina Zubkova, Andrzej Strojwas
Summary: The softening points of CTPs do not affect the structure of the coal plastic layer and the semi-coke structure, as the CTP additives independently change these characteristics. There is no correlation between softening points and the composition of volatile products emitted from blends, as well as the structural and chemical parameters of extracted material.
Article
Energy & Fuels
Ximei Li, Jianmin Gao, Yaning Zhang, Yu Zhang, Qian Du, Shaohua Wu, Yukun Qin
Article
Energy & Fuels
Heming Dong, Yu Zhang, Qian Du, Jianmin Gao, Qi Shang, Dongdong Feng, Yudong Huang
Summary: The generation and emission characteristics of PM2.5 from three 300 MW power plant circulating fluidized bed boilers were investigated. The results show that the number size distributions of fine particles presented one single peak, but there was no peak in mass size distributions. The minimum removal efficiencies of the precipitator appeared between 0.1 to 1 μm and the number concentration of the external bed CFB boiler was much higher than that of the general CFB boiler.
Article
Energy & Fuels
Qiaoqun Sun, Wei Zhang, Yu Zhang, Yaodong Dan, Heming Dong, Jiwang Wen, Qian Du, Jianmin Gao
Summary: This paper investigates the capture efficiency of charged droplets for micron and submicron particles and finds that the sphericity and charge of the particles are positively correlated with the capture efficiency. The particle size significantly impacts the capture efficiency.
Article
Energy & Fuels
Yidan Song, Qiaoqun Sun, Yu Zhang, Yaodong Da, Heming Dong, Hebo Zhang, Qian Du, Jianmin Gao
Summary: This paper establishes an economic optimization model for natural gas combined cooling, heating, and power (CCHP) system in severe cold regions. The combination of internal combustion engine and steam boiler has the most cost-effective performance, saving 10.7%, 7.8%, and 18.3% compared to three single equipment subsystems respectively. This provides theoretical support for the construction of multi-energy heterogeneous energy systems.
