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
Energy & Fuels
Rong Sun, Yan Xiao, Jingchun Yan, Laihong Shen, Hongcun Bai
Summary: The research aims to elucidate the reaction mechanisms of BaFe2O4 with solid carbon (C) and carbon monoxide (CO) during chemical looping gasification process. It was found that BaFe2O4 is more active in solid-solid reaction while Fe2O3 performs better in solid-gas reaction. The study suggests that BaFe2O4 has potential in CLG process due to its stronger surface activity and weaker lattice oxygen migration ability compared to Fe2O3.
Article
Thermodynamics
Shiwen Fang, Zhengbing Deng, Yan Lin, Zhen Huang, Lixing Ding, Lisheng Deng, Hongyu Huang
Summary: This study explores the nitrogen migration law and control methods of nitrogen pollutants in the process of chemical looping gasification, providing important references for reducing nitrogen emissions.
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
Energy & Fuels
Fanrui Meng, Jianshe Li, Xianchun Li, Huanran Wang, Yuejun Liu
Summary: The characteristics of chemical looping hydrogen generation using sewage sludge and corncob as fuel were investigated. The reduction depth and catalytic reaction mechanism of CuO-Fe2O3 oxygen carrier were analyzed. The adsorption properties of C molecules on CuFe2O4 surface were simulated using DFT.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Thermodynamics
Shiwen Fang, Zhengbing Deng, Yan Lin, Zhen Huang, Lixing Ding, Lisheng Deng, Hongyu Huang
Summary: In this study, copper slag modified by NiO was used as an oxygen carrier to convert sewage sludge into syngas in chemical looping gasification. The research investigated the changes of nitrogen species in gas, tar, and char under different conditions, and found that promoting the oxidation of nitrogen compounds can be achieved by increasing oxygen equivalent coefficient, steam content, and cycle number.
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
Engineering, Environmental
Jing Han, Rui Shan, Jing Gu, Haoran Yuan, Yong Chen
Summary: Nickel-containing electroplating sludge (NiES) and dyeing sludge (DS) were used to prepare oxygen carriers (OCs) for chemical looping gasification (CLG) of DS. The crystal and pore structures of the prepared OCs were investigated, and their elemental composition and reactivity were analyzed. The addition of the two OCs significantly promoted the gas yield of DS while accelerating the gasification process. A high carbon conversion rate and acceptable gas yield could be achieved at a temperature of 850 degrees C. Furthermore, a new harmless method for the recycling treatment of NiES was provided.
Article
Chemistry, Analytical
Jaroslav Mosko, Michal Jeremias, Siarhei Skoblia, Zdenek Beno, Vineet Singh Sikarwar, Matej Husek, Hailong Wang, Michael Pohorely
Summary: Residual moisture in pyrolyzed fuel affects the distribution and properties of pyrolysis products due to the concentration of steam in the primary pyrolysis gas. Using steam as a carrier gas results in significantly different product distribution and properties, especially at high temperatures. This approach offers a simplified way to predict and optimize pyrolysis products in large-scale units.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2022)
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
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
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
Energy & Fuels
Chen Song, Caifu Li, Dan Zhu, Wenbin Chen, Lun Ai, Neng Huang, Li Yang, Chuwen Guo, Fang Liu
Summary: This study proposes a comprehensive method for the treatment and reuse of industrial waste, such as sewage sludge and red mud. By using red mud as an oxygen carrier, sewage sludge as fuel, and low-concentration methane as an oxidizing gas, the study demonstrates efficient recycling of these wastes. The results show high treatment efficiency and reuse effectiveness under specific temperature and gas proportions.
Article
Energy & Fuels
Bashar Al-Qadri, Xiaojia Wang, Delu Chen
Summary: Chemical looping co-gasification of alfalfa and polyethylene with Fe2O3 as oxygen carrier was studied in a fixed-bed reactor, revealing that at a gasification temperature of 950 degrees C, the optimum product distribution was achieved with specific ratios of steam/alfalfa, OC/alfalfa, and PE/alfalfa. The presence of PE in the feedstock led to higher production of synthetic gas, particularly the hydrogen yield, as the H-2/CO ratio increased to more than 2 to match the demand of Fischer-Tropsch synthesis.
Article
Green & Sustainable Science & Technology
Zhe Cui, Wende Tian, Haoran Zhang, Qingjie Guo
Summary: This paper proposes a cleaner system integrating CP and CLG processes to produce high purity synthesis gas with lower CO2 emission, aiming at the sustainable development of the coal industry. Simulation results show that the purity of synthesis gas produced by the CP-CLG system is about 20% higher than that of a single coal CLG system.
JOURNAL OF CLEANER PRODUCTION
(2021)
