Article
Thermodynamics
Mengting Si, Qiang Cheng, Lin Yuan, Zixue Luo, Zuwei Xu, Haibo Zhao
Summary: The chemical composition, oxidation reactivity, nanostructure, and particle size of two coal-derived soot were investigated experimentally. The soot samples were collected from single coal combustion flames and analyzed using various techniques. The results showed differences in surface chemistry and oxidation reactivity between the two kinds of soot. Furthermore, the nanostructure and particle size distribution of the soot were influenced by flame height.
COMBUSTION AND FLAME
(2022)
Article
Energy & Fuels
Baolong Guo, Yuntao Liang, Guansheng Qi, Wei Lu, Fuchao Tian, Yong Sun, Shuanglin Song
Summary: This study quantitatively examines the chemical inhibition effect of a halogen salt inhibitor, revealing that raising the pre-inhibition temperature can enhance the contribution of chemical inhibition and reduce the risk of coal self-heating.
Article
Thermodynamics
Hao Liu, Zenghua Li, Yongliang Yang, Guodong Miao, Yaozhong Han
Summary: The changes in the physical and chemical structure of coal samples during the spontaneous combustion latency were investigated. Low temperature oxidation experiments, scanning electron microscopy (SEM) and low-pressure nitrogen gas adsorption (LP-N2GA) were conducted to analyze the effect of low temperature oxidation on the physical structure of coal. The results showed that low temperature oxidation caused ravines and asperities on the coal surface, and significantly improved the specific surface area, pore volume and pore diameter at 70 degrees C. The in situ constant temperature Fourier Transform infrared spectroscopy (FTIR) revealed different reactive activities and changing trends of active groups in coal.
Article
Thermodynamics
Wenbin Zhao, Yang Liu, Juan Zhao, Huaisheng Cao, Qing Tan, Haifeng Zhang, Jinfeng Wang
Summary: This study used multicomponent polymer PAS-W as a material to solve the problem of coal spontaneous combustion in the goaf. By determining the optimal concentration and conducting various experiments, it was found that PAS-W had good flame retardant effect and stability.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Jiawen Cai, Shengqiang Yang, Yan Zhong, Wanxin Song, Wancheng Zheng
Summary: Developing an efficient inhibitor with multiple inhibitory properties is crucial for preventing coal spontaneous combustion. A synergistic antioxidant with both physical and chemical inhibitory properties was prepared, and the optimal formulation ratio and mass ratio were determined.
COMBUSTION SCIENCE AND TECHNOLOGY
(2022)
Article
Environmental Sciences
Zhenhong Chen, Hao Chen, Xinfa Zhu, Daping Xia, Yanpeng Chen, Meng Geng, Zhihao Bai
Summary: This study examines the effects of physical, chemical, and biological pretreatment methods on microbial gas production in coal seams. The results show that grinding enhances contact between coal samples and bacteria liquid, chemical pretreatment improves gas production capacity, and biological pretreatment greatly enhances microbial degradation of coal beds.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Review
Materials Science, Multidisciplinary
Jennifer K. Watkins, Adrian Gonzales, Adrian R. Wagner, Elizabeth S. Sooby, Brian J. Jaques
Summary: This review discusses the challenges and opportunities for alloyed and composite fuel architectures in mitigating fuel oxidation during cladding breach in water-cooled reactors. It focuses on the oxidation performance of uranium mononitride and explores high uranium density fuels like UN, U3Si2, UC, and UB2 for use in accident tolerant and advanced technology nuclear reactors. The review also covers literature on degradation modes, thermodynamics, and oxidation performance of pure UN and UN-compounds as well as alloyed and composite architectures.
JOURNAL OF NUCLEAR MATERIALS
(2021)
Article
Energy & Fuels
Xi Chen, Jiahui Gao, Cunbao Deng, Shaocheng Ge, Chaonan Fan, Wei Zhang
Summary: This study investigated the effect of different ionic liquid composite solutions on the wettability and chemical structure of coal dust. Four ionic liquid compound solutions with the same anion/cation were selected and optimized, and a wetting agent with good water retention performance was chosen. The functional group content in the coal treated by these compound solutions were analyzed using FTIR.
Article
Energy & Fuels
He Li, Xianhua Shen, Jiexin Lu, Yi Lu, Shiliang Shi, Shuzhen Shao
Summary: The inhibitory effect of Resveratrol (RES) on coal spontaneous combustion (CSC) was studied. The oxidation properties of coal were analyzed, and the reactions of RES on coal were investigated by various methods. The results showed that different concentrations of RES had the ability to prevent CSC, with 10 wt% RES achieving the highest inhibition rate of 79%. RES-treated coal exhibited a lower mass loss rate and a reduction in the maximum heat flow, indicating its effectiveness in preventing CSC.
Article
Thermodynamics
Hao Liu, Zenghua Li, Guodong Miao, Jingjing Yang, Xiangqiang Wu, Jiahui Li
Summary: The oxidation reaction intensity and changes in functional groups of coal during spontaneous combustion latency were studied. It was found that temperature and particle size have significant effects on the reaction, and the temperature dependence of reaction rate does not conform to the Arrhenius equation. The results provide important insights into the oxidation mechanism of coal during spontaneous combustion latency.
Article
Energy & Fuels
Shengli Guo, Shujie Yuan, Weile Geng, Ziwen Dong
Summary: A novel thermosensitive hydrogel was successfully prepared in this study for the prevention of coal spontaneous combustion. Optimization of gel properties was achieved through central composite design, and a composite inhibitor was proposed to combat coal oxidation. The results indicated that this composite inhibitor had a significant inhibitory effect on coal oxidation.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Construction & Building Technology
Blandine Quelennec, Zhibo Duan, Romain Delannoy, Nicolas Gay, Matthieu Briffaut, Vincent Tognetti, Nicolas Delpouve, Laurent Delbreilh, Laure Bredif, Alexis Duthoit, Emmanuel Richaud
Summary: This study describes the changes in gas permeability of epoxy coatings after thermal aging at different temperatures, and its implications for barrier properties in protecting concrete in civil engineering. The results show that with increasing time and aging temperature, epoxy coatings become more permeable, leading to a loss in its barrier properties. The loss of plasticizer was found to have only a moderate impact on barrier and mechanical properties, while thermal oxidation severely damages both barrier and mechanical properties due to chain scissions.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Energy & Fuels
Huaming Dai, Guangqian Liang, Hepeng Yin, Qi Zhao, Xianfeng Chen, Song He
Summary: A composite inhibitor consisting of zeolite and carbamide was prepared to reduce the risk of coal dust explosion. The optimal ratio of 1:1 showed the best inhibition effect, significantly decreasing the explosion pressure and flame propagation velocity. The inhibition mechanism of the composite inhibitor was elucidated by analyzing samples and explosion residues.
Article
Materials Science, Multidisciplinary
Z. Mousavi, M. Pourabdoli
Summary: The effects of silver content, sintering temperature, sintering time, and compaction pressure on the properties of contacts were studied. It was found that increasing the silver content and the time and temperature of the sintering process increased the oxidation of copper. Galvanic corrosion and the Kirkendall effect between copper and silver resulted in the formation of microvoids around copper particles, facilitating the copper oxidation. The apparent bulk density remained relatively constant with increasing sintering temperature up to 700 degrees C, but decreased sharply at higher temperatures. Increasing the sintering time up to 60 minutes increased the apparent bulk density, while longer times decreased it. Compaction pressure did not significantly affect the apparent bulk density.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Chemistry, Physical
Saifei Wang, Shiguang Zhao, Yi Zhang, Yahan Wang, Yubo Zhang, Yiyuan Zhang, Xiaolong Tang, Jing Han, Erhong Duan
Summary: Cu-Mn-C-O composite catalysts were synthesized using deep eutectic solvent as an inducer for low-temperature catalytic combustion of methane. The addition of the solvent resulted in the formation of a new phase of MnCO3 in the catalyst, leading to changes in the number and distribution of acid-base sites on the catalyst surface, promoting the desorption of reaction products. The composite catalysts exhibited enhanced methane catalytic activity due to the high proportional distribution of high-valent manganese, resulting in a large number of surface adsorbed oxygen species and facilitating oxidation of methane at lower temperatures.
MOLECULAR CATALYSIS
(2022)
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.