Article
Energy & Fuels
Ruidi Wei, Liwei Ren, Fujiang Geng
Summary: The study found that there were significant differences in gasification reactivity between coal chars and petcokes, with the gasification reactivity of coal chars increasing as coal rank decreased. The characteristics of the chars were closely related to their gasification reactivity, with lower degree of graphitization and more developed pore structure leading to higher gasification reactivity. Furthermore, the presence of oxygen-containing functional groups and active components in coal chars had a promoting effect on the gasification reaction.
JOURNAL OF THE ENERGY INSTITUTE
(2021)
Article
Energy & Fuels
Neelam Kumari, Sujan Saha, Gajanan Sahu, Vishal Chauhan, Rupak Roy, Sudipta Datta, Prakash D. Chavan
Summary: The present investigation compares gasification components of petcoke, sawdust, and high ash coal, and discusses the effects of temperature and nature of different solid fuels on gasification reactivity. Gasification kinetics and the influence of diffusion resistance on gasification behavior are also studied.
BIOMASS CONVERSION AND BIOREFINERY
(2022)
Article
Agricultural Engineering
Annett Pollex, Thomas Zeng, Sabine Bandemer, Axel Ulbricht, Kristina Herrmann, Dieter Braekow
Summary: Gasification chars from wood gasification, although possessing useful characteristics, are rarely used and considered as wastes due to limited knowledge on their characteristics, incomplete understanding of influencing factors, and lack of standardization. An analysis of gasification char samples from different gasification plant manufacturers revealed variations in characteristics, with different levels of ash, carbon content, and organic contaminants. Post-treatment is often necessary to qualify these materials for material applications.
BIOMASS & BIOENERGY
(2023)
Article
Energy & Fuels
Fangqi Liu, Ge Yu, Dunxi Yu, Sheng Chen, Jingkun Han, Xin Yu, Jianqun Wu
Summary: The catalytic behavior of exchangeable calcium in coals during pyrolysis and gasification processes was studied. The experiment showed that char aging significantly changes the state and dispersion of calcium, but does not affect its catalytic action. Increasing temperature enhances gasification reactivity, while the decrease in calcium dispersion may offset the increase in catalytic activity.
Article
Green & Sustainable Science & Technology
Jun Kang, Lihui Zhao, Weiwei Li, Yuncai Song
Summary: The co-gasification of petroleum coke with coal or biomass in a fluidized bed is a promising solution to avoid environmental issues. This study utilized a feed-forward back propagation neural network (FFBPNN) with three optimization algorithms to predict the process outcomes accurately.
Article
Mining & Mineral Processing
Tao Xu, Yongping Wu, Sankar Bhattacharya
Summary: The gasification kinetic modelling and prediction model for Victorian brown coal chars were found to be applicable in this study, with limited effect on gasification rate by particle size under 106μm. Maddingley char and Yallourn char showed differences in activation energies and pre-exponential factors during CO2 gasification.
INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY
(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)
Review
Thermodynamics
Deshal Yadav, Sujan Saha, Gajanan Sahu, Prakash D. Chavan, Sudipta Datta, Vishal Chauhan, Neelam Kumari
Summary: Gasification is a promising method for cleaner energy production, and thermogravimetric analysis (TGA) is widely used to study the reactivity and kinetics of different carbonaceous feedstocks. This review compares and analyzes the behavior of various feedstocks during gasification using TGA, and finds that biomass has higher reactivity than MSW, coal, and petcoke. The review also highlights different feedstocks and thermal analysis techniques used in gasification.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Metallurgy & Metallurgical Engineering
Ya-jie Wang, Hai-bin Zuo, Jun Zhao, Guang-wei Wang
Summary: The study showed that the gasification reactivity of coal chars is influenced by coal rank and carbonaceous structure, with higher coal ranks leading to lower gasification reactivity and higher reaction orders.
JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
(2021)
Article
Energy & Fuels
Andre Kiyoshi Coutinho Sato, Regina Francielle Silva Paulino, Victor Arruda Ferraz de Campos, Celso Eduardo Tuna, Jose Luz Silveira
Summary: This paper studies the application of petcoke gasification as a fuel for electricity generation in Brazilian oil refineries. Through thermodynamic studies and economic analysis, data on the efficiency, cost, and payback period of electricity production are obtained.
Article
Energy & Fuels
Duarte Magalhaes, Alican Akgul, Feyza Kazanc, Mario Costa
Summary: This study investigated the co-gasification of biomass and coal chars obtained from fast pyrolysis and found synergistic effects when the biochar ratio exceeded 25%, indicating a threshold for K/Al and K/Si ratios in the char blend for observing synergies.
Article
Thermodynamics
Xinsha Zhang, Meng Ma, Yonghui Bai, Xudong Song, Jiaofei Wang, Peng Lv, Guangsuo Yu
Summary: This study investigates the kinetics of coal char during high temperature gasification using a thermogravimetric analyzer and in situ heating stage microscope. The results show that the random pore model is optimal for fitting the kinetics of coals. The gasification of char is controlled by ash layer diffusion, and the apparent activation energy of the char ranges from 82.27 to 90.74 kJ/mol for Yangchangwan coal and from 89.78 to 91.42 kJ/mol for Shenfu coal. Most char particles participate in gasification via the random pore mode and form amorphous ash. Some particles of Yangchangwan coal char undergo gasification by both homogeneous and shrinking core modes.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Chemistry, Physical
Zhenyong Yin, Hao Xu, Yanpeng Chen, Tiantian Zhao, Jingjie Wu
Summary: Research on hydrogen production from coal gasification focuses on the formation of CO and H2 from coal and water vapor. Pure oxygen-steam gasification is used to improve gasification efficiency. The two-step gasification process involving coal pyrolysis and char gasification is an efficient method for hydrogen production.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Multidisciplinary
Li Ma, Qisen Mao, Chang'an Wang, Zhonghui Duan, Meijing Chen, Fu Yang, Jiamiao Liu, Zhendong Wang, Defu Che
Summary: Limited research has been conducted on the pyrolysis and mild oxidation behaviors of tar-rich coal in Northwestern China. In this study, the thermogravimetric analysis method was used to investigate the pyrolysis and mild oxidation characteristics of tar-rich coal, providing insights into its efficient utilization. The experimental results show the effects of ultimate temperature, oxygen addition, and heating rate on the properties of the residual semi-coke. This study improves the understanding of the pyrolysis characteristics of tar-rich coal and its potential for efficient utilization.
Article
Thermodynamics
Zhutao Liu, Jin-Hui Zhan, Dengguo Lai, Minghui Zuo, Xiaoxing Liu
Summary: This study investigated the intrinsic characteristics of Naomaohu coal pyrolysis in a two-stage fixed-bed reactor. The results showed that different temperature chars had varying effects on pyrolysis volatiles, with temperature playing a major role in affecting the distribution of pyrolysates. Char was found to be beneficial for the content and quality of light oil in the low-temperature range, but had a negative impact on the yield and quality of oil in higher temperatures.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Energy & Fuels
Ming Liu, Zhongjie Shen, Qinfeng Liang, Jianliang Xu, Haifeng Liu
Article
Engineering, Chemical
Ming Liu, Zhongjie Shen, Jianliang Xu, Qinfeng Liang, Haifeng Liu
Article
Energy & Fuels
Ming Liu, Zhongjie Shen, Qinfeng Liang, Jianliang Xu, Haifeng Liu
Article
Engineering, Chemical
Ming Liu, Zhongjie Shen, Qinfeng Liang, Jianliang Xu, Haifeng Liu
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2019)
Article
Energy & Fuels
Ming Liu, Zhongjie Shen, Qinfeng Liang, Jianliang Xu, Hui Zhao, Haifeng Liu
Article
Engineering, Environmental
Ming Liu, Zhongjie Shen, Qinfeng Liang, Haifeng Liu
CHEMICAL ENGINEERING JOURNAL
(2020)
Article
Engineering, Environmental
Ming Liu, Fanghua Li, Haifeng Liu, Chi-Hwa Wang
Summary: The catalytic effect of chicken manure ash on gasification reaction was found to be strong, enhancing CO production, promoting pore development, while excess ash can block reaction surface, and the high content of calcium and potassium contributed dramatically to the catalytic effect.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Energy & Fuels
Ming Liu, Zhongjie Shen, Qinfeng Liang, Jianliang Xu, Haifeng Liu
Summary: The gasification reaction of petcoke on the wall slag layer is an important issue during the co-gasification process of coal and petcoke. The catalytic effect of slag on petcoke gasification on slag surface was demonstrated, but only effective when the particle is on the surface of slag. In addition, the increased residence time of petcoke can increase the carbon conversion compared with that in the gasifier chamber, indicating the importance of synergy between catalytic effect of slag and decreased reaction surface area.
Article
Environmental Sciences
Srishti Arora, Janelle Jung, Ming Liu, Xian Li, Abhimanyu Goel, Jialing Chen, Shuang Song, Carly Anderson, Dexiang Chen, Ken Leong, Song Hau Lim, Siew Lee Fong, Subhadip Ghosh, Alexander Lin, Harn Wei Kua, Hugh T. W. Tan, Yanjun Dai, Chi-Hwa Wang
Summary: The increasing amount of organic waste calls for the establishment of sustainable closed-loop systems for waste reduction and valorization, which can produce biooil, syngas, and thermal energy from organic waste through gasification and pyrolysis systems. The production of biochar, a valuable byproduct, can help reduce waste mass significantly and has various applications, such as soil conditioning and bioremediation.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Thermodynamics
Ming Liu, Zhongjie Shen, Shengyu Zhou, Jianliang Xu, Qinfeng Liang, Chi-Hwa Wang, Haifeng Liu
Summary: This work presented the characteristics and mechanisms of particle collision and aggregations in gas-solid phase reaction, demonstrating that the spatial position of particles and reactant concentration distribution are the main reasons for the formation of different aggregation structures. Experimentally and simulation analyses were conducted to explore the mechanisms of different particle aggregation patterns in non-catalytic gas-solid phase reactions.
COMBUSTION AND FLAME
(2022)
Article
Thermodynamics
Ming Liu, Zhongjie Shen, Jianliang Xu, Qinfeng Liang, Haifeng Liu
Summary: The study investigated the effect of molten slag covered on particle surface on mass transfer at high temperatures, analyzed the in-situ gasification process of different char particles, and proposed a reaction model for predicting carbon conversion of high ash content coal chars. The predicted carbon conversion of the proposed new model showed ideal agreement with the experimental data.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Engineering, Chemical
Ming Liu, Guoqiang Shao, Pengpeng Lv, Jun Li, Qingshan Zhu
Summary: The fluidization quality has a significant impact on mass transfer and deposition reactions, which are crucial for achieving uniform deposition of TiO2 thin films on fluorophlogopite particles. It was found that an effective addition ratio of nano-TiO2 particles above 0.2 wt% is needed to achieve fluidization of the fluorophlogopite particles. The addition of nano-TiO2 particles leads to competition between free TiO2 particles and fluorophlogopite particles, resulting in a decreased coating rate of TiO2 on fluorophlogopite particles.