Article
Chemistry, Applied
Jun Young Kim, Zezhong John Li, Naoko Ellis, C. Jim Lim, John R. Grace
Summary: A jet attrition model has been developed to predict the evolution of particle size distribution in fluidized beds, showing good agreement with experimental results. The model considers fragmentation, abrasion, and material fatigue, with fitting parameters determined based on nonlinear least squares regression.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Engineering, Chemical
Tianxu Shen, Xiao Zhu, Tao Song, Laihong Shen
Summary: The micro-interconnected fluidized bed (MIFB) was designed to improve the evaluation condition of oxygen carrier by reducing bed inventory and improving gas-solid distribution. The use of hematite as the oxygen carrier resulted in stable and flexible fluidization with internal perforated plates enhancing particle residence time. A different fluidization phenomenon was observed in the two-stage reactor, showing potential for extending oxygen carrier lifetime.
Article
Chemistry, Applied
Heyu Li, Zhe Sun, Lijun Tian, Lei Gao, YuSheng Xu, Yan Cao
Summary: The attrition characteristics of an oxygen carrier were investigated under various conditions in a fluidization-based chemical looping system. The study found that the initial attrition rate was higher at ambient and elevated temperatures, and the physical properties of the bed material significantly affected the attrition rate. Furthermore, the temperature elevation improved the attrition resistance of the oxygen carrier.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Pulkit Kumar, Ajit K. Parwani, Dileep Kumar Gupta, Vivek Vitankar
Summary: This study conducted cold flow simulation to investigate the hydrodynamic viability of the fast-fluidized bed air reactor, with hematite selected as the oxygen carrier. The results obtained a stable solution and were validated from experimental data.
APPLIED SCIENCES-BASEL
(2021)
Article
Energy & Fuels
Giovanny S. de Oliveira, Ciro E. S. Lobo, Carlos E. A. Padilha, Domingos F. S. Souza, Juan A. C. Ruiz
Summary: Brazil aims to reduce its CO2 emissions by utilizing glycerin in Chemical Looping Combustion (CLC). The study evaluates the feasibility of using glycerin in CLC and finds that the addition of ethanol improves combustion efficiency, while the addition of methanol reduces efficiency.
Article
Chemistry, Applied
Nasrin Nemati, Magnus Ryden
Summary: The study investigated chemical-looping combustion in a packed-fluidized bed reactor and found that fuel conversion is greatly influenced by oxygen carrier bed height and the type of packing used. Using different types of packing can significantly improve fuel conversion efficiency, with different packings yielding different effects.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Agricultural Engineering
Andrea Di Giuliano, Stefania Lucantonio, Barbara Malsegna, Katia Gallucci
Summary: The European research project CLARA studied pretreated residual biomasses for chemical looping gasification. The study found that temperature increase positively affected devolatilization, with oxygen carriers showing more activity at 900 degrees C. Biomass pretreatments improved the H-2/CO molar ratio and decreased carbon conversion.
BIORESOURCE TECHNOLOGY
(2022)
Article
Energy & Fuels
Jingchun Yan, Tianxu Shen, Peng Wang, Xianglei Yin, Xiao Zhu, Shouxi Jiang, Laihong Shen
Summary: An innovative fluidized bed thermogravimetric analyzer was designed to study the performance of oxygen carriers in chemical looping combustion processes, revealing that high-grade manganese ore with less silicon content is more suitable for industrial CLC pilots.
Article
Energy & Fuels
Ratnakumar V. Kappagantula, Gordon D. Ingram, Hari B. Vuthaluru
Summary: Chemical Looping Combustion technologies have the ability to capture carbon dioxide and are modeled using a specialized Fluidized Bed Reactor block in Aspen Plus. Sensitivity studies showed that solid volume fraction decreases with bed height and superficial velocity, while the height to diameter ratio of the fluidized bed is an important variable in reactor design.
Article
Chemistry, Applied
M. T. Izquierdo, F. Garcia-Labiano, A. Abad, A. Cabello, P. Gayan, L. F. de Diego, J. Adanez
Summary: This study evaluated the stability of a CuO/Al2O3 impregnated oxygen carrier during methane chemical looping combustion at high oxygen carrier to fuel ratios. The research found that low oxygen carrier conversion variation reduced copper loss from particles, but reoxidizing the oxygen carrier at high temperatures was difficult due to the formation of CuAlO2. Operating at temperatures around 800 degrees C with low solid conversion variation is recommended to limit copper loss while maintaining physical stability.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Engineering, Environmental
A. Cabello, A. Abad, T. Mendiara, M. T. Izquierdo, L. F. de Diego
Summary: Chemical looping combustion (CLC) allows for the simultaneous combustion of a fuel and the capture of CO2. In this study, tests were conducted in a lab-scale CLC unit using a promising Cu-based oxygen carrier to determine its combustion performance and durability. Operating conditions were carefully selected to maximize the oxygen carrier's durability while achieving complete CH4 combustion. The results showed that the Cu-based oxygen carrier exhibited excellent mechanical resistance, making it suitable for continuous CLC operation at 900 degrees C.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Applied
Doki Yamaguchi, Liangguang Tang, Jose Orellana, Trevor D. Hadley, Sankar Bhattacharya, Kok-Seng Lim
Summary: The study developed a compact fully looped chemical looping reactor and found that the CLC performance increased with increasing operation time over 36 hours, as indicated by the increase in the CO2/CO molar ratio. The morphology changes and ash interaction of the Australian ilmenite did not noticeably affect the CLC performance or operation during continuous operation.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Green & Sustainable Science & Technology
Birgitta Narindri Rara Winayu, Chun-Ta Li, Hsin Chu
Summary: Calcined ilmenite was used as an oxygen carrier in chemical looping combustion (CLC) and achieved high conversion rates. Increasing syngas concentration, operating temperature, and superficial velocity improved the reaction rate and oxygen carrier utilization, but the application of CO and CH4 caused carbon deposition and surface blocking. High redox cycles had a negative effect on the performance of the oxygen carrier.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Energy & Fuels
Tanja Schneider, Dominik Mueller, Juergen Karl
Summary: This research investigates the influence of the oxygen carrier ilmenite on solid biomass conversion in fluidized bed combustion. The experiments show that ilmenite enhances the in-bed CO2 yield during methane combustion. Solid-solid reactions with ilmenite are negligible, while heterogeneous gas-solid reactions decrease the O-2 partial pressure and limit the char conversion rate. The oxygen buffering effect of ilmenite is mitigated due to high local oxygen demand and limited pellet distribution. Continuous operation in a BFB confirms higher in-bed fuel conversion, lower CO emissions, and less fluctuation in the flue gas during inhomogeneous fuel supply.
Article
Chemistry, Applied
Shiwen Fang, Shuchang Yan, Qijie Lu, Chengyang Li, Haitao Wang, Yan Lin, Zhen Huang, Hongyu Huang
Summary: The lignite chemical looping combustion and hematite as an oxygen carrier were studied in this paper. By analyzing the thermodynamic behavior and conducting experiments, it was found that increasing the oxygen carrier to lignite mass ratio could reduce the release of NH3 and HCN. The release of HCN increased with temperature, while NH3 release decreased. Increasing the gas flow rate resulted in higher NH3 and HCN emissions. Modifying the oxygen carrier with Ni and Cu improved oxidation performance and significantly reduced NH3 and HCN emissions.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Engineering, Chemical
Tianxu Shen, Xiao Zhu, Tao Song, Laihong Shen
Summary: The micro-interconnected fluidized bed (MIFB) was designed to improve the evaluation condition of oxygen carrier by reducing bed inventory and improving gas-solid distribution. The use of hematite as the oxygen carrier resulted in stable and flexible fluidization with internal perforated plates enhancing particle residence time. A different fluidization phenomenon was observed in the two-stage reactor, showing potential for extending oxygen carrier lifetime.
Article
Agricultural Engineering
Jingchun Yan, Shouxi Jiang, Tao Song, Laihong Shen
Summary: The study enhanced the activity of LaFeO3 through Ba substitution, with La0.3Ba0.7FeO3 (L3B7F) showing the best performance in achieving efficient algae chemical looping catalytic steam gasification process.
BIOMASS & BIOENERGY
(2021)
Article
Energy & Fuels
Qi Hong, Tianxu Shen, Peng Wang, Laihong Shen, Leming Cheng, Tao Song
Summary: The developed FB-TGA has made a meaningful contribution to materials engineering by fully utilizing the advantages of fluidized bed on a micro scale. Different types of red mud were used as oxygen carriers in a CLC process, showing varying reaction behaviors. Among them, the LBRM sample exhibited the best attrition resistance and underwent an activation process.
Article
Agricultural Engineering
Peng Wang, Jingchun Yan, Shuyuan Wang, Peng Xu, Laihong Shen, Tao Song
Summary: Ammonia production from nitrogen-enriched renewable resources pyrolysis using lanthanum ferrite perovskite (LaFeO3) and hydrogen (H2) atmosphere shows promising results in enhancing NH3 yields and nitrogen conversion. The synergistic effects between H2 and LaFeO3 facilitate fuel-nitrogen transfer and promote the formation of NH3, with pyrolysis temperature playing a significant role in N-species distribution and conversion. Additionally, LaFeO3 demonstrates considerable stability over multiple cyclic operations.
BIORESOURCE TECHNOLOGY
(2021)
Article
Energy & Fuels
Xianyu Liu, Jiandong Ma, Qi Hong, Shiwei Ma, Huijun Ge, Tao Song
Summary: The study found that potassium can be used as a catalyst to accelerate coke conversion in the chemical looping gasification process, with good catalytic effects. Different potassium introduction modes have different effects on syngas yields and distribution, carbon conversion and potassium evolution. Using potassium to modify coke can achieve higher average carbon conversion rates.
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
Chemistry, Physical
Shiwei Ma, Fang Cheng, Ping Lu, Tao Song
Summary: Modified hematite with CeO2 loading improves the redox reactivity and cyclic stability in chemical looping hydrogen generation. Hematite with 20% CeO2 loading exhibits the best performance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Energy & Fuels
Yue Guo, Shangyi Yin, Ping Lu, Tao Song
Summary: A new design of a staged fuel reactor is proposed to reduce the pressure drop during chemical looping applications. The design integrates a bubbling bed and a spouted fluidized bed. Cold experimental setup is established to gain insights into the gas-solid fluid dynamics of the new design. The results show different flow types and corresponding transition boundaries, providing a way to lower the overall pressure drop and reduce the fan energy consumption.
Article
Agricultural Engineering
Lu Chen, Huijun Ge, Ping Li, Changdong Sheng, Tao Song
Summary: Biomass fueled-Chemical Looping Combustion (CLC) provides a pathway for negative CO2 emission. However, the interaction behavior between organic potassium (K) and an oxygen carrier in CLC is not well understood. This study investigated the interaction between organic K and Fe2O3/Al2O3 oxygen carrier and found that the introduction of steam can suppress agglomeration.
BIOMASS & BIOENERGY
(2022)
Article
Energy & Fuels
Wenyu Zhang, Xianyu Liu, Guiling Xu, Tao Song
Summary: Using red mud as the oxygen carrier, the study found that it can promote sulfur conversion during the chemical looping combustion process. The addition of potassium catalyst further enhances sulfur conversion and carbon conversion.
Article
Energy & Fuels
Peng Wang, Qi Hong, Laihong Shen, Tao Song
Summary: The reactivity and stability of two low-cost red muds as oxygen carriers for chemical looping combustion were experimentally investigated. The results showed that XinFa red mud had better reactivity and stability compared to LuShan red mud, achieving complete conversion of biomass char with better resistance to attrition.
Article
Chemistry, Physical
Chenhan Liu, Chao Wu, Tao Song, Yunshan Zhao, Juekuan Yang, Ping Lu, Gang Zhang, Yunfei Chen
Summary: Searching for high thermal conductivity materials is a long-term endeavor. Comparing the thermal conductivities of selected carbon allotropes, we found that a high symmetry operation number and a small atom number in the primitive unit cell can reduce the phonon-phonon scattering phase space. Through comprehensive searching of a carbon allotrope database, we found that the bcc-C6 allotrope has a high thermal conductivity due to its high symmetry operation number and small atom number. The calculated lattice thermal conductivity of bcc-C6 can reach 2198 W/m K at room temperature if its atomic packing fraction equals that of diamond.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Thermodynamics
Tao Song, Jianzheng Xu
Summary: Chemical Looping Combustion (CLC) is a cost-effective method for CO2 negative emission from biomass. Experimental and modeling results show that using low-cost red mud as an oxygen carrier can reduce the inhibitory effect of H2 on carbon reaction, thereby significantly enhancing char conversion.
COMBUSTION AND FLAME
(2023)
Article
Energy & Fuels
Yu Yang, Yali Shao, Shiwei Ma, Ping Li, Tao Song
Summary: Oxygen Carrier Aided Combustion (OCAC) is a process that improves combustion efficiency by using oxygen carrier particles. This study found that red mud is a potential low-cost oxygen carrier and investigated the interaction mechanism between organic and inorganic potassium and red mud oxygen carriers, as well as their effect on particle agglomeration.
Article
Energy & Fuels
Hewei Jiang, Yangtian Ye, Ping Lu, Mingxing Zhao, Guiling Xu, Dandan Chen, Tao Song
Summary: This study investigated the effects of different biomass species, torrefaction temperature, and holding time on the hygroscopicity of biochars, and found that the hydrophobicity of biochar is enhanced with increasing torrefaction temperature. Woody biochars exhibited better hydrophobicity compared to straw biochars under the same torrefaction conditions.
JOURNAL OF THE ENERGY INSTITUTE
(2021)