Article
Energy & Fuels
Huan Zhou, Guoqiang Wei, Qun Yi, Zheming Zhang, Yingjie Zhao, Yuke Zhang, Zhen Huang, Anqing Zheng, Kun Zhao, Zengli Zhao
Summary: Chemical looping gasification (CLG) of Yunnan lignite with Fe-Mn mixed oxygen carriers (OCs) was conducted to produce high-purity synthesis gas and reduce pollutant emissions. The Fe-Mn composite OCs exhibited oxygen decoupling characteristics and synergistic effects between active components, making them suitable for the gasification process.
Article
Engineering, Environmental
Genyang Tang, Jing Gu, Guoqiang Wei, Haoran Yuan, Yong Chen
Summary: Chemical looping gasification (CLG) is a novel technology that allows for the clean and efficient utilization of solid fuels. This study investigated the use of NiO/Ca2Fe2O5 as an oxygen carrier in the CLG process, specifically focusing on the reaction mechanism, morphology evolution, and the influence of key reaction parameters. The results showed that the addition of Ni improved the oxygen release performance of Ca2Fe2O5 and enhanced tar cracking and carbon conversion. Overall, Ca2Fe2O5 was found to be a better base than CaFe2O4, and the optimum temperature for the process was determined to be 850 degrees C.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Thermodynamics
Min Li, Laizhi Sun, Lei Chen, Hongqing Feng, Baofeng Zhao, Shuangxia Yang, Xinping Xie, Xiaodong Zhang
Summary: The combination of Fe2O3 and CaO as oxygen carriers showed the best activity for chemical looping gasification of biomass. The maximum syngas yield was achieved at a sawdust:Fe2O3:CaO mass ratio of 2:2:1 and a reaction temperature of 850 degrees C. Fe2O3 provided oxygen for gasification, while CaO absorbed CO2 and catalyzed reactions, showing good cycling characteristics.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Thermodynamics
Genyang Tang, Jing Gu, Zhen Huang, Haoran Yuan, Yong Chen
Summary: Biomass-derived chemical looping gasification (BCLG) utilizes Ca-Fe oxygen carriers as catalysts to promote efficient lignocellulose conversion and hydrogen-enriched syngas production. Experimental results demonstrate the reaction mechanisms and synergistic effects of Ca-Fe oxygen carriers at different temperatures, providing insights for explaining their performance.
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
Engineering, Chemical
Nanhang Dong, Ruiqiang Huo, Ming Liu, Lisheng Deng, Zhengbing Deng, Guozhang Chang, Zhen Huang, Hongyu Huang
Summary: The NiO modification can significantly enhance the reactivity of copper slag, contributing to improved sludge conversion, especially for sludge char conversion.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2021)
Article
Engineering, Environmental
Ivan Sampron, Arturo Cabello, Francisco Garcia-Labiano, Maria T. Izquierdo, Luis F. de Diego
Summary: Biomass chemical looping gasification (BCLG) is a promising technique for producing renewable syngas with negative carbon emissions. In this study, a Cu-based oxygen carrier, Cu14Al_ICB, was tested for 45 hours using pine sawdust as fuel. Factors such as the oxygen-to-fuel ratio and gasification temperature were found to affect the syngas composition and gasification parameters. The Cu14Al_ICB oxygen carrier demonstrated excellent performance in terms of syngas yield, char gasification, tar removal, and mechanical properties throughout the experiment.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Energy & Fuels
Jinlong Xie, Kang Zhu, Zhen Zhang, Xinfei Chen, Yan Lin, Jianjun Hu, Ya Xiong, Yongqi Zhang, Zhen Huang, Hongyu Huang
Summary: Chemical looping gasification (CLG) technology using NiO-modified hematite as an oxygen carrier enhances the conversion of wood waste into high-quality syngas. The optimal O/W ratio is found to be 1, with a maximum valid gas yield of 0.69 m(3)/kg. Higher reaction temperatures and appropriate steam amount also improve the conversion of wood waste and syngas quality. The reactivity of the NiO-modified hematite remains stable during 20 cycles.
Article
Energy & Fuels
Laixing Luo, Xing Zheng, Jianye Wang, Wu Qin, Xianbin Xiao, Zongming Zheng
Summary: In this study, biomass chemical looping gasification with Fe2O3 as the oxygen carrier was used for the production of hydrogen, with ethanol as the probe reaction to reveal the decomposition mechanism. The results showed that the degree of reduction of the Fe2O3(001) surface had a significant effect on the catalytic decomposition of ethanol into synthesis gas, indicating the importance of understanding the CLG reaction mechanism on perfect and reduced OC surfaces.
Article
Energy & Fuels
Ming Yang, Da Song, Yang Li, Jinzeng Cao, Guoqiang Wei, Fang He
Summary: This study investigated the chemical looping gasification (CLG) of bituminite using NiFe2O4 oxygen carrier. The changes in the phase of the oxygen carrier during the reaction and the reaction mechanism were explored. The results showed that elevated temperature and adding steam facilitated the gasification reaction, and adding ZrO2 and alkali metal enhanced the performance of the oxygen carrier. The optimized reaction conditions yielded a carbon conversion rate of 95% and a syngas selectivity of 86%. After 20 redox cycles, the carbon conversion rate remained at around 90% and the syngas selectivity was stably maintained above 80%.
Article
Agricultural Engineering
Zongming Zheng, Laixing Luo, Xing Zheng, Ruonan Duan, Xianbin Xiao, Changqing Dong, Wu Qin
Summary: This study proposes the OW-CLG scheme for hydrogen production using straw stalk and concentrated distillery wastewater as feedstock. The experimental results show that temperature and the molar ratio of V2O3 to CH4 have a significant effect on the OW-CLG process. The introduction of ethanol liquid waste and V2O3 can enhance hydrogen generation efficiency.
INDUSTRIAL CROPS AND PRODUCTS
(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
Chemistry, Applied
Oscar Condori, Francisco Garcia-Labiano, Luis F. de Diego, Maria T. Izquierdo, Alberto Abad, Juan Adanez
Summary: Biomass Chemical Looping Gasification using LD slag as an oxygen carrier can produce high quality syngas from various types of biomass under autothermal conditions, without agglomeration issues.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Thermodynamics
Haochen Sun, Zhiqing Wang, Yitian Fang, Zheyu Liu, Libo Dong, Xing Zhou, Zhongliang Yu, Xiangyu Li, Jin Bai, Jiejie Huang
Summary: The study proposed a novel Fe-based CO2-gasification process for biomass, finding that CO2 has opposite effects on oxygen transfer capacity and carbon conversion rate, with an inflection point at around 20% concentration. Additionally, CO2 and oxygen carrier synergistically enhance tar cracking.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Agricultural Engineering
Jianjun Hu, Tianpeng Zhang, Quanguo Zhang, Xiaoyu Yan, Shuheng Zhao, Jiatao Dang, Wei Wang
Summary: The study used CaO/Fe2O3 as a composite oxygen carrier for biomass chemical looping gasification (CLG), showing that adding CaO can significantly improve the quality of syngas and reduce greenhouse gas emissions. Various factors such as the ratio of Fe2O3 to CaO, steam to biomass, and oxygen carrier to biomass were found to affect the syngas composition, with temperature also playing a significant role in CLG gas yield. The possible reaction mechanism suggested that variations in Ca may be the main factor in gas composition fluctuation.
BIORESOURCE TECHNOLOGY
(2021)
