Article
Energy & Fuels
Meng Ma, Jiaofei Wang, Yonghui Bai, Peng Lv, Xudong Song, Weiguang Su, Lu Ding, Juntao Wei, Guangsuo Yu
Summary: Volatile-char interactions affect the chemical structure and reactivity of coal char, with O-containing functional groups playing an important role in char reactivity. The decrease in gasification reactivity due to volatile-char interactions is attributed to the decrease in aromatic C-O and C=O, and the increase in graphite carbon structures.
Article
Thermodynamics
Meng Ma, Jiaofei Wang, Yonghui Bai, Peng Lv, Xudong Song, Weiguang Su, Juntao Wei, Guangsuo Yu
Summary: This study investigated the volatile-char interaction in coal and cow manure co-pyrolysis process and its effect on coal char reactivity. The results showed that the interaction inhibited coal char reactivity, but the inhibition varied depending on the vapor-residence time and co-pyrolysis mode.
Article
Chemistry, Analytical
Haiyu Meng, Mengzhuo Wang, Zhiqiang Wu, Shuzhong Wang, Jun Zhao, Zhe Wang, Dongqi Wang, Hui Wang, Jiake Li, Huaien Li
Summary: In this study, the product distributions and gaseous product composition during the co-pyrolysis of platanus wood and bituminous coal were investigated. Complex synergistic effects were observed, where platanus wood had both positive and negative impacts on the formation of different products. Platanus wood also promoted the specific surface area and complexity of the pore structure of co-pyrolytic char. This study provides important insights for designing and optimizing co-pyrolysis systems for biomass and coal.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2022)
Article
Energy & Fuels
Chen Liang, Xiaofang Wang, Qinggang Lyu
Summary: Using oxygen and steam as gasifying agent in a Circulating Fluidized Bed (CFB) preheater can enhance the gasification reactivity of coal; replacing air by O-2-steam in the gasifying agent and controlling the modification temperature and steam to coal ratio can improve the gasification reactivity of modified char; the gasification reactivity of modified char increases and then decreases with the highest value at a steam to coal ratio of 0.87.
Article
Energy & Fuels
Zixin Jiao, Li Liu, Yan Zhao, Xiye Chen, Penghua Qiu
Summary: The study evaluated the cogasification reactivity of Shenmu bituminous coal (SM) char and corn straw (CS) char in CO2 and found that increasing the blend ratio of CS and gasification temperature can weaken inhibition and enhance synergy. The addition of CS volatiles, especially potassium (K), can promote the cogasification reaction, with the promotion effect increasing with temperature. The comparison between CS-SM blend char and CS char volatiles-SM char showed different effects on gasification reactivity depending on the presence of alkali and alkaline earth metals.
Article
Energy & Fuels
Cheng Ma, Qiuxiang Yao, Yuzhen Zhao, Chong Zou, Junxue Zhao, Zongcheng Miao
Summary: Char gasification allows for the clean and efficient utilization of low-rank coal resources. The CO2 gasification behavior and kinetics of char samples produced under different atmospheric conditions were investigated. The results showed that the physicochemical structure and characteristics of the char samples had a significant impact on the gasification rate and activation energy. The application of a three-dimensional diffusion model provided insights into the CO2 gasification process of coal char.
JOURNAL OF THE ENERGY INSTITUTE
(2023)
Article
Engineering, Environmental
Guangchao Ding, Boshu He, Huifeng Yao, Yucheng Kuang, Jingge Song, Liangbin Su
Summary: In this study, the co-gasification characteristics and synergistic interaction of municipal solid waste (MSW) and bituminous coal (BC) in CO2 atmosphere were investigated using thermogravimetric analysis. Results showed that addition of MSW can enhance the gasification reactivity of BC, leading to improved overall gasification efficiency. A significant synergistic effect was observed in the char gasification stage for all blends, with the optimal blend ratio of BC found to be 40% for the co-gasification process.
Article
Chemistry, Physical
Fan Yang, Qingbo Yu, Wenjun Duan, Zhenfei Qi, Qin Qin
Summary: Electrochemical catalytic gasification (ECG) is a new approach for achieving high efficiency coal gasification at low reaction temperatures. Compared to common coal gasification (CCG), ECG yields higher carbon conversion, CO production and combustible components, which increase with power. In the ECG process, thermal electrons play a significant role.
CATALYSIS COMMUNICATIONS
(2021)
Article
Thermodynamics
Juntao Wei, Qinghua Guo, Xudong Song, Lu Ding, Alexander Mosqueda, Yurong Liu, Kunio Yoshikawa, Guangsuo Yu
Summary: This study investigated the co-gasification of blended char of bituminous coal and rice straw at different temperatures and found that the interaction between the binary particles influenced the reactivity and kinetics during co-gasification. The synergistic effect was weaker at higher HTC and gasification temperatures, affecting the transformation of mineral matter and the chemical structure evolution. The results suggest that the presence of synergistic effect can enhance blended char reactivity and improve co-gasification kinetics.
APPLIED THERMAL ENGINEERING
(2021)
Article
Chemistry, Analytical
Haigang Zhang, Zhongjie Shen, Zizheng Dong, Yiru Yang, Jianliang Xu, Qinfeng Liang, Haifeng Liu
Summary: This paper investigates the effects of temperature and oxygen content on coal pyrolysis product distribution, char structure, and reactive properties. The results show that higher temperature enhances the release of volatiles and tar cracking, leading to increased gas phase yield and syngas concentration. However, temperatures above 900 degrees Celsius intensify char graphitization, which is not favorable for gasification. Oxygen introduction at 900 degrees Celsius accelerates the release of volatiles and intensifies depolymerization reaction, increasing the gas yields of CO and CO2. The presence of trace oxygen reduces char graphitization and improves gasification reactivity but high oxygen content (8%) leads to combustion on the char surface, destroying its structure and reducing gasification activity.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2023)
Article
Energy & Fuels
Zixin Jiao, Xiye Chen, Yan Zhao, Li Liu, Chang Xing, Linyao Zhang, Penghua Qiu
Summary: This study evaluates the effect of active alkali and alkaline earth metals on the co-gasification process. The results show that active alkali and alkaline earth metals promote the increase of char content during pyrolysis, but catalyze the reaction of char, resulting in a reduction of char content during gasification.
JOURNAL OF THE ENERGY INSTITUTE
(2022)
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
Chemistry, Physical
Wencheng Yang, Jianbo Zhang, Lei Zhang, Jingying Li, Yonghui Bai, Ze Yan, Xiaoxun Ma, Cuili Hou, Wengui Yao
Summary: Partial gasification of coal char with addition of metal oxides can co-produce fuel gas and methane decomposition catalysts. Fe and Fe-Co composite oxides are found to be effective catalysts for fuel gas production, while Ni-based catalysts exhibit high and stable methane conversion in catalytic methane decomposition (CMD).
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
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
Wenda Zhang, Shaozeng Sun, Hanlin Zhu, Linyao Zhang, Yijun Zhao, Pengxiang Wang
Summary: The study reports the formation rules of gas products and evolution characteristics of physicochemical structure during the pyrolysis of Shenhua bituminous coal under different pressures, temperatures, and residence times. Increasing pressure, temperature, and residence time promote the release of carbon and nitrogen-containing gases, affecting the physicochemical structure of the char products.
