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
Thermodynamics
Yao Zhu, Qinhui Wang, Kaikun Li, Jianmeng Cen, Mengxiang Fang, Chengdong Ying
Summary: In this study, the pressurized isothermal pyrolysis characteristics of coal were investigated using a pressurized micro-fluidized bed reaction analyzer (P-MFBRA) for the first time. The effect of pressure on gas release characteristics and the kinetics of pressurized isothermal pyrolysis were explored. The results showed that the yields of CO2, CO, CH4, and H-2 increased with temperature and pressure. The differences in gas-releasing order reduced with increasing temperature and pressure, while the difference in gas-ending order first decreased and then increased with pressure.
Article
Energy & Fuels
Dandan Hu, Xi Zeng, Fang Wang, Yanbing Cui, Qi Zhou, Guangwen Xu
Summary: A newly-developed micro fluidized bed reaction analyser (MFBRA) was used to study the effects of char's inherent CaO on tar catalytic cracking. The presence of CaO significantly enhanced the tar conversion process, producing more effective gas components even at low temperatures. The activation energy of various gas products decreased, indicating the good catalytic activity of CaO in char.
Article
Agricultural Engineering
G. Grasa, I. Martinez, R. Murillo
Summary: Gasification kinetics of six chars from residual origin were studied under relatively low temperature, low CO2, and high H2O partial pressures. The Random Pore Model (RPM) showed the best fit to experimental results, but the selection of the reaction model depended on the ash composition, specifically the presence of alkali and alkaline earth metals. Chars with ash content higher than 30% wt. were modeled with the RPM model, while chars with the highest K/Si ratio required modified versions of the RPM to accurately predict reaction rates. Textural properties played a key role in determining reaction parameters, such as the pre-exponential factor and activation energy, for chars with similar ash content and composition.
BIOMASS & BIOENERGY
(2024)
Article
Chemistry, Applied
Lin Li, Shuai Tong, Lunbo Duan, Changsui Zhao, Zhipeng Shi
Summary: By comparing chars produced under different atmospheres, it was found that the pore structure and specific surface area of chars are significantly affected by the gasification environment, while the presence of chemical groups has a minor impact on the chars. The best gasification reactivities were obtained on the chars produced under 50%CO2/50%N2 and 50%H2O/50%N2 atmospheres, largely influenced by the porosity of the chars.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Metallurgy & Metallurgical Engineering
Ya-jie Wang, Hai-bin Zuo, Jun Zhao, Guang-wei Wang
Summary: The study showed that the gasification reactivity of coal chars is influenced by coal rank and carbonaceous structure, with higher coal ranks leading to lower gasification reactivity and higher reaction orders.
JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
(2021)
Article
Energy & Fuels
Sanjun Wu, Shihui Wang, Zhenshan Li
Summary: The study developed a micro-fluidized bed integrated with thermogravimetry-mass spectrometry (MFB-TG-MS) to evaluate the combustion kinetics of biomass char in the fluidized state. The MFB-TG-MS system reported herein allows for effective measurements of the rapid combustion kinetics closer to the intrinsic kinetics inside a fluidized bed reactor. A genetic algorithm was employed to optimize certain combustion kinetic parameters. This study provides valuable insights into the kinetics of biomass char combustion.
Article
Energy & Fuels
Jianfeng Cai, Zhimin Lu, Jinzheng Chen, Jing Chen, Zhengyan Bao, Shengyuan Guo, Shunchun Yao
Summary: Kinetic analysis is crucial in the gasification process. This study investigates the kinetic behavior of CO2 gasification of various wood chars using a non-isothermal method. The performance of different models is compared, and it is found that the two-step model shows the best performance. The results provide valuable experimental data for understanding the gasification process.
JOURNAL OF THE ENERGY INSTITUTE
(2023)
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
Energy & Fuels
Hairat Abduhani, Yalkunjan Tursun, Mei Zhong, Xueli Huang
Summary: The gas releasing characteristics and kinetics of chemical looping gasification (CLG) of cotton stalk under isothermal conditions were studied. The synergistic effect of CuO and NiO was found to increase the carbon conversion rate. Different OCs had different effects on the gas composition during gasification. The prepared bimetallic OC was found to be more suitable for CLG in terms of conversion effect and activation energy.
Article
Green & Sustainable Science & Technology
Shen Wang, Timo Dymala, Stefan Heinrich, Laihong Shen
Summary: In this study, a fluidized bed-thermogravimetric analysis (FB-TGA) is developed to investigate the gas-solid process of biomass pellets under high temperature fluidization. The devolatilization process of biomass is found to be a rapid phase transition process, primarily influenced by heat and mass transfer. On the other hand, char gasification is significantly slower and considered as the rate-control step.
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
(2023)
Article
Engineering, Environmental
Mian Xu, Xianqing Zhu, Xian Li, Zhenzhong Hu, Yun Huang, Ao Xia, Hong Yao
Summary: Accurate measurement of combustion kinetics is crucial for numerical simulation and process optimization of MSW-fired systems. The micro-fluidized bed reaction analyzer (MFBRA) was used to investigate combustion behaviors and kinetic modeling of noodles char (NC) and bamboo chopsticks char (BC), showing that TGA may not fully meet the requirements for MSW char combustion kinetics study.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Thermodynamics
Hongli Fan, Fenghai Li, Meiling Xu, Mingxi Guo, Qianqian Guo, Guopeng Han
Summary: The combined study of ash fusion temperature adjustment and gasification reactivity change provides valuable reference for biomass utilization. Jincheng coal fine char (JF) was found to effectively increase the ash fusion temperatures of peanut hull and cotton stalk through conversion of K-containing minerals. However, JF exerted adverse effects on the gasification reactivity of both biomass, with stronger effects at high JF ratios and low temperatures. The influence of JF on gasification reactivity was lower for cotton stalk due to its higher ash yield and K2O content.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Green & Sustainable Science & Technology
Jannatun Fatema, Tanvir Ahmed, Md. Minhajul Islam, Md. Nurus Sakib, A. M. Sarwaruddin Chowdhury, Papia Haque
Summary: Kitchen wastes can be converted into energy sources through gasification in a fluidized bed gasifier, leading to less environmental pollution. Optimizing gasification conditions can increase gas yield.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Chemistry, Physical
Kun He, Zhong Zheng, Zhiwei Chen, Hongsheng Chen, Weiping Hao
Summary: The study demonstrates that the reaction rate of hydrogen reduction of hematite increases with temperature and inlet H2 concentration, indicating potential applications in the field.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Energy & Fuels
Yingna Du, Chen Huang, Wei Jiang, Qiangwei Yan, Yongfei Li, Gang Chen
Summary: In this study, anionic surfactants modified hydrotalcite was used as a flow improver for crude oil under low-temperature conditions. The modified hydrotalcite showed a significant viscosity reduction effect on crude oil. The mechanism of the modified hydrotalcite on viscosity and pour point of crude oil was explored through characterization and analysis of the modified hydrotalcite and oil samples.
Article
Energy & Fuels
Mohammad Saeid Rostami, Mohammad Mehdi Khodaei
Summary: In this study, a hybrid structure, MIL-53(Al)@MWCNT, was synthesized by combining MIL-53(Al) particles and -COOH functionalized multi-walled carbon nanotube (MWCNT). The hybrid structure was then embedded in a polyethersulfone (PES) polymer matrix to prepare a mixed matrix membrane (MMM) for CO2/CH4 and CO2/N2 separation. The addition of MWCNTs prevented MIL-53(Al) aggregation, improved membrane mechanical properties, and enhanced gas separation efficiency.
Article
Energy & Fuels
Yunlong Li, Desheng Huang, Xiaomeng Dong, Daoyong Yang
Summary: This study develops theoretical and experimental techniques to determine the phase behavior and physical properties of DME/flue gas/water/heavy oil systems. Eight constant composition expansion (CCE) tests are conducted to obtain new experimental data. A thermodynamic model is used to accurately predict saturation pressure and swelling factors, as well as the phase boundaries of N2/heavy oil systems and DME/CO2/heavy oil systems, with high accuracy.
Article
Energy & Fuels
Morteza Afkhamipour, Ebad Seifi, Arash Esmaeili, Mohammad Shamsi, Tohid N. Borhani
Summary: Non-conventional amines are being researched worldwide to overcome the limitations of traditional amines like MEA and MDEA. Adequate process and thermodynamic models are crucial for understanding the applicability and performance of these amines in CO2 absorption, but studies on process modeling for these amines are limited. This study used rate-based modeling and Deshmukh-Mather method to model CO2 absorption by DETA solution in a packed column, validated the model with experimental data, and conducted a sensitivity analysis of mass transfer correlations. The study also compared the CO2 absorption efficiency of DETA solution with an ionic solvent [bmim]-[PF6] and highlighted the importance of finding optimum operational parameters for maximum absorption efficiency.
Article
Energy & Fuels
Arastoo Abdi, Mohamad Awarke, M. Reza Malayeri, Masoud Riazi
Summary: The utilization of smart water in EOR operations has gained attention, but more research is needed to understand the complex mechanisms involved. This study investigated the interfacial tension between smart water and crude oil, considering factors such as salt, pH, asphaltene type, and aged smart water. The results revealed that the hydration of ions in smart water plays a key role in its efficacy, with acidic and basic asphaltene acting as intrinsic surfactants. The pH also influenced the interfacial tension, and the aged smart water's interaction with crude oil depended on asphaltene type, salt, and salinity.
Article
Energy & Fuels
Dongao Zhu, Kun Zhu, Lixian Xu, Haiyan Huang, Jing He, Wenshuai Zhu, Huaming Li, Wei Jiang
Summary: In this study, cobalt-based metal-organic frameworks (Co-based MOFs) were used as supports and co-catalysts to confine the NHPI catalyst, solving the leaching issue. The NHPI@Co-MOF with carboxyl groups exhibited stronger acidity and facilitated the generation of active oxygen radicals O2•, resulting in enhanced catalytic activity. This research provides valuable insights into the selection of suitable organic linkers and broadens the research horizon of MOF hybrids in efficient oxidative desulfurization (ODS) applications.
Article
Energy & Fuels
Edwin G. Hoyos, Gloria Amo-Duodu, U. Gulsum Kiral, Laura Vargas-Estrada, Raquel Lebrero, Rail Munoz
Summary: This study investigated the impact of carbon-coated zero-valent nanoparticle concentration on photosynthetic biogas upgrading. The addition of nanoparticles significantly increased microalgae productivity and enhanced nitrogen and phosphorus assimilation. The presence of nanoparticles also improved the quality of biomethane produced.
Article
Energy & Fuels
Yao Xiao, Asma Leghari, Linfeng Liu, Fangchao Yu, Ming Gao, Lu Ding, Yu Yang, Xueli Chen, Xiaoyu Yan, Fuchen Wang
Summary: Iron is added as a flocculant in wastewater treatment and the hydrothermal carbonization (HTC) of sludge produces wastewater containing Fe. This study investigates the effect of aqueous phase (AP) recycling on hydrochar properties, iron evolution and environmental assessment during HTC of sludge. The results show that AP recycling process improves the dewatering performance of hydrochar and facilitates the recovery of Fe from the liquid phase.
Article
Energy & Fuels
He Liang, Tao Wang, Zhenmin Luo, Jianliang Yu, Weizhai Yi, Fangming Cheng, Jingyu Zhao, Xingqing Yan, Jun Deng, Jihao Shi
Summary: This study investigated the influence of inhibitors (carbon dioxide, nitrogen, and heptafluoropropane) on the lower flammability limit of hydrogen and determined the critical inhibitory concentration needed for complete suppression. The impact of inhibitors on explosive characteristics was evaluated, and the inhibitory mechanism was analyzed with chemical kinetics. The results showed that with the increase of inhibitor quantity, the lower flammability limit of hydrogen also increased. The research findings can contribute to the safe utilization of hydrogen energy.
Article
Energy & Fuels
Zonghui Liu, Zhongze Zhang, Yali Zhou, Ziling Wang, Mingyang Du, Zhe Wen, Bing Yan, Qingxiang Ma, Na Liu, Bing Xue
Summary: In this study, high-performance solid catalysts based on phosphotungstic acid (HPW) supported on Zr-SBA-15 were synthesized and evaluated for the one-pot conversion of furfural (FUR) to γ-valerolactone (GVL). The catalysts were characterized using various techniques, and the ratio of HPW and Zr was found to significantly affect the selectivity of GVL. The HPW/Zr-SBA-15 (2-4-15) catalyst exhibited the highest GVL yield (83%) under optimized reaction conditions, and it was determined that a balance between Bronsted acid sites (BAS) and Lewis acid sites (LAS) was crucial for achieving higher catalytic performance. The reaction parameters and catalyst stability were also investigated.
Article
Energy & Fuels
Michael Stoehr, Stephan Ruoff, Bastian Rauch, Wolfgang Meier, Patrick Le Clercq
Summary: As part of the global energy transition, an experimental study was conducted to understand the effects of different fuel properties on droplet vaporization for various conventional and alternative fuels. The study utilized a flow channel to measure the evolution of droplet diameters over time and distance. The results revealed the temperature-dependent effects of physical properties, such as boiling point, liquid density, and enthalpy of vaporization, and showed the complex interactions of preferential vaporization and temperature-dependent influences of physical properties for multi-component fuels.
Article
Energy & Fuels
Yuan Zhuang, Ruikang Wu, Xinyan Wang, Rui Zhai, Changyong Gao
Summary: Through experimental validation and optimization of the chemical kinetic model, it was found that methanol can accelerate the oxidation reaction of ammonia, and methanol can be rapidly oxidized at high concentration. HO2 was found to generate a significant amount of OH radicals, facilitating the oxidation of methanol and ammonia. Rating: 7.5/10.
Article
Energy & Fuels
Radwan M. EL-Zohairy, Ahmed S. Attia, A. S. Huzayyin, Ahmed I. EL-Seesy
Summary: This paper presents a lab-scale experimental study on the impact of diethyl ether (DEE) as an additive to waste cooking oil biodiesel with Jet A-1 on combustion and emission features of a swirl-stabilized premixed flame. The addition of DEE to biodiesel significantly affects the flame temperature distribution and emissions. The W20D20 blend of DEE, biodiesel, and Jet A-1 shows similar flame temperature distribution to Jet A-1 and significantly reduces UHC, CO, and NOx emissions compared to Jet A-1.
Article
Energy & Fuels
Jiang Bian, Ziyuan Zhao, Yang Liu, Ran Cheng, Xuerui Zang, Xuewen Cao
Summary: This study presents a novel method for ammonia separation using supersonic flow and develops a mathematical model to investigate the condensation phenomenon. The results demonstrate that the L-P nucleation model accurately characterizes the nucleation process of ammonia at low temperatures. Numerical simulations also show that increasing pressure and concentration can enhance ammonia condensation efficiency.
Article
Energy & Fuels
Shiyuan Pan, Xiaodan Shi, Beibei Dong, Jan Skvaril, Haoran Zhang, Yongtu Liang, Hailong Li
Summary: Integrating CO2 capture with biomass-fired combined heat and power (bio-CHP) plants is a promising method for achieving negative emissions. This study develops a reliable data-driven model based on the Transformer architecture to predict the flowrate and CO2 concentration of flue gas in real time. The model validation shows high prediction accuracy, and the potential impact of meteorological parameters on model accuracy is assessed. The results demonstrate that the Transformer model outperforms other models and using near-infrared spectral data as input features improves the prediction accuracy.