Article
Engineering, Environmental
Jinchen Ma, Daofeng Mei, Chaoquan Wang, Xin Tian, Zhaohui Liu, Haibo Zhao
Summary: This study investigated the fate of sulfur during in-situ gasification chemical looping combustion of coal, highlighting the resistance of Fe2O3/Al2O3 to sulfur and the positive effects of temperature and oxygen/fuel ratio on the conversion of sulfur compounds. Additionally, the research demonstrated the desulfurization function of coal ash and the effective conversion of sulfur-containing gases into SO2 using oxygen carrier materials.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Energy & Fuels
Yanan Wang, Xin Tian, Haibo Zhao, Kunlei Liu, Yunchang Dong, Zhao Su, Chuguang Zheng
Summary: By using a combination of copper ore and red mud as oxygen carrier, better combustion performance was achieved in chemical looping combustion, with a synergistic effect observed between the two materials.
Article
Thermodynamics
Junjie Lin, Kun Luo, Shuai Wang, Liyan Sun, Jianren Fan
Summary: The hydrodynamic and thermochemical characteristics in the coal-direct chemical looping combustion (CLC) process were studied using a self-developed computational fluid dynamics - discrete element method (CFD-DEM) approach. The results showed that increasing the coal feeding rate improved the combustion efficiency, while finer oxygen carriers promoted the conversion of gas products. In addition, a dual-side coal feeding arrangement significantly improved the system's uniformity.
Article
Energy & Fuels
Chaohe Zheng, Chuanbao Zheng, Mingze Su, Haibo Zhao
Summary: In this study, a particle-resolved simulation was conducted to investigate the effects of char particle size and reaction temperature on char conversion characteristics. The competition between CO2 gasification and H2O gasification was explored through single-particle simulations under mixed and separate atmospheres. The results showed that the char gasification rate in CO2/H2O mixtures was lower than the sum of the char-H2O gasification rate and the char-CO2 gasification rate, and the inhibition of gasification products played a significant role in char-CO2 gasification.
Article
Energy & Fuels
K. Sekar Pragadeesh, Iyyaswami Regupathi, D. Ruben Sudhakar
Summary: Utilizing large solid fuel particles in fluidized bed Chemical Looping Combustion (CLC) can reduce the energy penalty associated with carbon capture. This study suggests using large particles of all fuels, including high-ash coals, in CLC systems without prior size reduction, with fuel type found to be the prime influencer of char conversion time and fragmentation phenomena.
Article
Energy & Fuels
Jianzheng Xu, Tao Song
Summary: This study conducted experiments and modeling on the CO2-gasification of rice husk char using a bed of red mud oxygen-carrier. The effects of oxygen carrier, temperature, and CO2 concentration were evaluated and modeled. The results showed that the red mud significantly enhanced the gasification of char. A model coupling the kinetics of char gasification and mass transfers within and surrounding the char was established and showed a good agreement with experimental results. The study also revealed the presence of mass transfer resistance within the char particle, which led to pore structure changes at a carbon conversion of about 0.3.
Article
Energy & Fuels
Dikun Hong, Liang Liu, Chunbo Wang, Ting Si, Xin Guo
Summary: An atomistic coal char representation was constructed via ReaxFF MD simulation, investigating the combustion and gasification characteristics of the char. The activation energies obtained for various reactions were in good agreement with experimental data, revealing the generation of large amounts of C2 species during char-H2O gasification.
Article
Chemistry, Physical
Cao Kuang, Shuzhong Wang, Song Lv, Jianjun Cai, Ming Luo, Jun Zhao
Summary: Cu-based oxygen carriers modified by iron ore and chrysotile showed enhanced performance in in-situ gasification and chemical-looping with oxygen uncoupling processes, improving energy conversion efficiency, stability, and high-temperature tolerance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Thermodynamics
Christopher R. Shaddix, Ethan S. Hecht, Cristina Gonzalo-Tirado, Brian S. Haynes
Summary: Previous research has shown that CO2 and H2O gasification reactions play a significant role in the combustion of pulverized coal (pc) char, especially in oxy-fuel environments. This study aims to quantify the influence of CO2 gasification reaction by combining experimental measurements and simulations. The results demonstrate a consistent relationship between the gasification reaction rate and the char particle temperatures and burnout rates in oxy-fuel combustion environments.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2023)
Article
Chemistry, Applied
Qi Hong, Peng Wang, Ziying Chen, Zhen Huang, Laihong Shen, Tao Song
Summary: Red mud shows low reactivity with methane and better reactivity with biomass char. It exhibits stable reactivity during oxygen carrier cycles, but tends to agglomerate during methane fluidized bed experiments.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Thermodynamics
Siqi Liu, Liping Wen, Yanqing Niu, Bokang Yan, Yu Lei, Denghui Wang, Shi'en Hui
Summary: The impact of CO2 on coal char combustion is complex due to its thermal and chemical effects. Experimental results show that carbon conversion ratios exhibit a V-type distribution with increasing CO2 concentrations, with minimum conversion points at 5-10%. The endothermicity effect of gasification reaction becomes more influential at higher CO2 concentrations.
COMBUSTION AND FLAME
(2022)
Article
Energy & Fuels
Siqi Liu, Fang He, Kun Zhao, Haibo Zhao, Zhen Huang, Guoqiang Wei, Wen Yang
Summary: Coal chemical looping gasification (CCLG) is a promising technology with high resource utilization rate and environmental protection properties, requiring suitable oxygen carriers and optimized operating conditions for coal conversion and H2&CO production. This study tested a Cu-Fe bi-ore oxygen carrier and found that the optimal gasification conditions were at 950 degrees C with a oxygen carrier-to-coal mass ratio of 3:1 and steam rate of 0.08 ml/min, achieving a syngas yield of 58 mmol/g, 75.2% syngas selectivity, and 85.3% carbon conversion.
Article
Engineering, Environmental
Lei Pang, Yingjuan Shao, Wenqi Zhong, Hao Liu
Summary: Pressurized oxy-coal combustion has potential for high efficiency and low cost CO2 capture. Increased pressure and oxygen concentration reduce burnout time of char particles and improve their reactivity and temperature. A combustion model shows pressure's impact on char burnout time.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Applied
Yunchang Dong, Yanan Wang, Jinchen Ma, Hengfeng Bu, Chuanbao Zheng, Haibo Zhao
Summary: In this study, composite oxygen carriers were prepared using extrusion-spheronization method with fine iron and copper ores as raw materials and inert aluminosilicates as binders. After optimization, the oxygen carriers showed good performance in terms of reactivity and stability, indicating the suitability of the method for large-scale preparation of oxygen carrier particles.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Chenkai Gu, Jing Jin, Ye Li, Ruiyang Li, Bo Dong
Summary: Pyrolysis of low-rank coal in CO2 atmosphere can reduce carbon emissions while comprehensively utilizing coal resources. The influences of CO2 on the pyrolysis characteristic and product distribution of low-rank coal are analyzed. It is found that CO2 inhibits the conversion of char to tar in the early stage, but promotes the decomposition of char and increases the yield of tar and pyrolysis gas in the later stage. Reforming reaction of CO2 with alkanes generates free hydrogen radicals, which promotes the cleavage of various bonds and increases the yield of light tar.
Article
Thermodynamics
Mingze Su, Jie Cao, Xin Tian, Yongliang Zhang, Haibo Zhao
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2019)
Article
Thermodynamics
Jinchen Ma, Jinxing Wang, Xin Tian, Haibo Zhao
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2019)
Article
Chemistry, Physical
Ryan B. Dudek, Xin Tian, Millicent Blivin, Luke M. Neal, Haibo Zhao, Fanxing Li
APPLIED CATALYSIS B-ENVIRONMENTAL
(2019)
Article
Energy & Fuels
Xi Chen, Jinchen Ma, Xin Tian, Zuwei Xu, Haibo Zhao
Article
Thermodynamics
Mingze Su, Xin Tian, Haibo Zhao
COMBUSTION AND FLAME
(2020)
Article
Thermodynamics
Xin Tian, Mingze Su, Haibo Zhao
COMBUSTION AND FLAME
(2020)
Review
Green & Sustainable Science & Technology
Haibo Zhao, Xin Tian, Jinchen Ma, Mingze Su, Baowen Wang, Daofeng Mei
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
(2020)
Review
Energy & Fuels
Haibo Zhao, Xin Tian, Jinchen Ma, Xi Chen, Mingze Su, Chaohe Zheng, Yanan Wang
Article
Engineering, Environmental
Jinchen Ma, Daofeng Mei, Chaoquan Wang, Xin Tian, Zhaohui Liu, Haibo Zhao
Summary: This study investigated the fate of sulfur during in-situ gasification chemical looping combustion of coal, highlighting the resistance of Fe2O3/Al2O3 to sulfur and the positive effects of temperature and oxygen/fuel ratio on the conversion of sulfur compounds. Additionally, the research demonstrated the desulfurization function of coal ash and the effective conversion of sulfur-containing gases into SO2 using oxygen carrier materials.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Applied
Tao Jin, Hongtao Wang, Jiebang Peng, Yushan Wu, Zhen Huang, Xin Tian, Mingyue Ding
Summary: This study investigated the feasibility of using metal-modified HZSM-5 zeolite as catalysts for monocyclic aromatic hydrocarbons production in lignin catalytic pyrolysis. The 1%Co-HZ catalyst showed excellent performance and resistance to carbon deposition.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Chemistry, Applied
Tao Jin, Donghong Zhang, Jiebang Peng, Yushan Wu, Jingjing Ma, Jianli Zhang, Xin Tian, Mingyue Ding
Summary: In this study, HZSM-5 zeolites pretreated with organic alkali and cobalt were used as catalysts for the production of monocyclic aromatic hydrocarbons from lignin via catalytic fast pyrolysis. Cobalt modification was found to enhance the acidity and production of monocyclic aromatic hydrocarbons. The addition of cetyltrimethylammonium bromide regulated the mesoporous structure of the zeolite and prevented over-treatment. The HZSM-5 pretreated with TPAOH showed the highest monocyclic aromatic hydrocarbons production under the optimal conditions.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Energy & Fuels
Chong Tian, Yuanquan Hu, Xin Tian, Zhifeng Huang
Summary: This study provides a comprehensive investigation on the arsenic partition and associations in inhalable particles generated from coal combustion. The results reveal the strong associations among arsenic and other elements, as well as the dominant pathway for arsenic accumulations in particulate matter. The study also highlights the importance of secondary reactions and the role of specific elements in determining arsenic transformation and speciation in particles.
Article
Thermodynamics
Mingze Su, Haibo Zhao, Xin Tian
COMBUSTION AND FLAME
(2020)
Article
Chemistry, Physical
Xin Tian, Ryan B. Dudek, Yunfei Gao, Haibo Zhao, Fanxing Li
CATALYSIS SCIENCE & TECHNOLOGY
(2019)
Correction
Chemistry, Applied
Jia Liu, Juntong Dong, Xiaodan Li, Teng Xu, Zhenguo Li, Jeffrey Dankwa Ampah, Mubasher Ikram, Shihai Zhang, Chao Jin, Zhenlong Geng, Tianyun Sun, Haifeng Liu
FUEL PROCESSING TECHNOLOGY
(2024)
Article
Chemistry, Applied
Seba Alareeqi, Daniel Bahamon, Kyriaki Polychronopoulou, Lourdes F. Vega
Summary: This study explores the potential application of single-atom-alloy (SAA) catalysts in bio-oils hydrodeoxygenation refining using density functional theory (DFT) and microkinetic modeling. It establishes the relationships between stability, adsorptive properties, and activity structures for bio-oil derivatives, providing guidance for the synthesis of cost-effective SAA combinations.
FUEL PROCESSING TECHNOLOGY
(2024)
Article
Chemistry, Applied
Bin Hu, Wen -Ming Zhang, Xue-Wen Guo, Ji Liu, Xiao Yang, Qiang Lu
Summary: This study explored the pyrolysis behaviors and mechanisms of different monosaccharides, including arabinose, galactose, galacturonic acid, and glucuronic acid. The roles of structural differences in these monosaccharides were analyzed, and it was found that glucuronic acid undergoes a special C-C bond breaking reaction during pyrolysis. The findings provide a deep understanding of the pyrolysis chemistry of hemicellulose and the role of different branches.
FUEL PROCESSING TECHNOLOGY
(2024)
Review
Chemistry, Applied
Youwei Zhi, Donghai Xu, Guanyu Jiang, Wanpeng Yang, Zhilin Chen, Peigao Duan, Jie Zhang
Summary: Hydrothermal carbonization (HTC) is an effective method for the harmless disposal of municipal sludge (MS) and offers potential applications for the obtained products. Optimizing reaction conditions, coupling with other waste materials, and combining different processes can improve the performance of HTC. Furthermore, HTC contributes to energy recovery and enhances the quality of life cycle assessment.
FUEL PROCESSING TECHNOLOGY
(2024)
Article
Chemistry, Applied
Jia Wang, Jianchun Jiang, Dongxian Li, Xianzhi Meng, Arthur J. Ragauskas
Summary: This study presents a scalable process for converting holocellulose and cellulosic wastes into advanced oxygen-containing biofuels with high furan, cyclic ketone, and ethanol content. By combining hydropyrolysis and vapor-phase hydrodeoxygenation using Pd/Al2O3 as a catalyst, the researchers achieved high yields and conversions. The integrated process holds great promise for biomass waste conversion into advanced biofuels.
FUEL PROCESSING TECHNOLOGY
(2024)
Article
Chemistry, Applied
Florian Held, Jannis Reusch, Steffen Salenbauch, Christian Hasse
Summary: The accurate prediction and assessment of soot emissions in internal combustion engines are crucial for the development of sustainable powertrains. This study presents a detailed quadrature-based method of moments (QMOM) soot model coupled with a state-of-the-art flow solver for the simulation of gasoline engines. The model accurately describes the entire cause-and-effect chain of soot formation, growth and oxidation. Experimental validation and engine cycle simulations are used to identify the root cause of observed soot formation hotspots.
FUEL PROCESSING TECHNOLOGY
(2024)