Article
Engineering, Chemical
Maria Mitu, Domnina Razus, Dorin Boldor, Cosmin Marculescu
Summary: Willow wood is a promising biomass for pyrolysis due to its fast growth, renewability, and high energy density. The pyrolysis of willow wood produced a multi-fuel gaseous mixture with a specific composition. Numerical simulations were conducted to investigate the combustion characteristics of these multi-fuel mixtures with air, providing important parameters for further analysis. The determination of overall activation parameters of multifuel oxidation with air was achieved by correlating the obtained parameters with initial pressure and temperature.
Article
Thermodynamics
Shangkun Zhou, Wenjun Yang, Houzhang Tan, Qiwei An, Jinhua Wang, Hongchao Dai, Xiaoxiao Wang, Xuebin Wang, Shuanghui Deng
Summary: Ammonia (NH3) plays a crucial role in large-scale storage and long-distance transportation of renewable energy. Co-firing with syngas and bio-syngas, along with increasing the initial temperature of reactants, are effective methods to enhance the reactivity of NH3 flames. However, current kinetic models lack accuracy in temperature dependence, indicating a need for further research in this area.
COMBUSTION AND FLAME
(2021)
Review
Green & Sustainable Science & Technology
E. V. Jithin, G. K. S. Raghuram, T. V. Keshavamurthy, Ratna Kishore Velamati, Chockalingam Prathap, Robin John Varghese
Summary: Syngas is a promising alternative fuel with clean combustion and lower greenhouse gas emissions, but its wide compositional variability poses challenges in the development of burners and combustion chambers. Recent research focuses on fundamental combustion characteristics of syngas, such as laminar and turbulent burning velocity, and the comparison of prediction capabilities using different reaction mechanisms.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Article
Energy & Fuels
Natarajan Rajesh, M. Akash, Chockalingam Prathap
Summary: This study investigates the dilution effects of steam, carbon dioxide, and nitrogen on the unstretched laminar burning velocity and burned gas Markstein length of premixed mixtures. The addition of 50% diluents significantly suppressed flame propagation, with CO2 showing the highest impact due to the simultaneous reduction in flame temperature and kinetic effect. Experimental and simulated results provide valuable insights into the behavior of different diluents in combustion processes.
Article
Energy & Fuels
Fahui Wang, Yuan Wang, Dan Zhang, Xiaoping Wen, Guoyan Chen
Summary: The effects of N2 dilution and CH4 addition on the combustion characteristics of complex biomass syngas were studied. The results show significant influences on the laminar burning velocities and NO generation.
Article
Chemistry, Physical
Mohamed E. Morsy, Junfeng Yang
Summary: This study investigates the cellular instabilities of hydrogen and methane mixtures at high-pressure lab-scale experiments, aiming to predict the flame instabilities in large-scale atmospheric explosions. The results indicate that pressure and strain rate play significant roles in flame stability.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Thermodynamics
Xinlu Han, Marco Lubrano Lavadera, Christian Brackmann, Zhihua Wang, Yong He, Alexander A. Konnov
Summary: The formation of nitric oxide (NO) in methane (CH4) flames has been extensively studied, but discrepancies between simulations using different kinetic mechanisms and experimental results persist. Experimental data was collected for NO formation in post-flame zones of CH4+O2+N2 flames with varying oxygen ratios. Analysis showed that thermal-NO production plays a key role in the increase of NO mole fraction in stoichiometric and fuel-lean flames as oxygen ratio increases.
COMBUSTION AND FLAME
(2021)
Article
Energy & Fuels
Qiaosheng Zhang, Guoyan Chen, Haoxin Deng, Xiaoping Wen, Fahui Wang, Anchao Zhang, Wei Sheng
Summary: The study experimentally measured and numerically calculated the LBVs of seven different composition mixtures, showing a significant increase in LBVs with higher oxygen concentrations and higher sensitivity of CH4-rich mixtures to oxygen levels. Different reaction mechanisms exhibit variations in predicting LBVs under different conditions.
Article
Thermodynamics
Guo-Peng Zhang, Guo-Xiu Li, Hong-Meng Li, Jia-Cheng Lv
Summary: This study experimentally investigated the combustion characteristics of a hydrogen-rich syngas premixed flame with different diluents. The results showed that the flame propagation speed was lower under CO2 dilution but had a higher flame acceleration effect, and as the dilution increased, the rate of pressure rise and the maximum combustion explosion pressure gradually decreased.
Article
Energy & Fuels
R. Rabello de Castro, P. Brequigny, J. P. Dufitumukiza, C. Mounaim-Rousselle
Summary: Syngas, a gaseous biofuel, requires operation mode adaptation when used for stationary electricity generation in Internal Combustion engines. Research indicates that combustion parameters of different syngas compositions from various gasifiers affect flame speeds, with Updraft and Downdraft compositions showing higher speeds. Kinetic modeling results show good overall agreement with experimental data, with CRECK mechanism deviating by only 5-10%.
Article
Chemistry, Physical
Yanchao Li, Shenyin Yang, Mingshu Bi, Yonghao Zhou, Kai Zhang, Wei Gao
Summary: The purpose of this work is to evaluate the characteristics of hydrogen-blend methane explosion. The explosion characteristics without initial turbulence or with initial turbulence are explored. Factors affecting laminar burning velocity and turbulent flame regime are revealed. Different prediction models are developed to evaluate peak explosion pressure of hydrogen-blended methane fuel.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Energy & Fuels
Shixing Wang, Guoqing Wang, Ayman M. Elbaz, Thibault F. Guiberti, William L. Roberts
Summary: This study focuses on the effects of turbulent intensity, ammonia content, and equivalence ratio on the flame structure and NO emissions of ammonia/methane/air flames, as well as their links to OH-PLIF intensity. It is found that the flame shape is determined by the ammonia content and equivalence ratio, and a unified correlation between turbulent intensity and OH-PLIF intensity is proposed. A new description of the link between NO, OH, and ammonia content is provided, improving the correlation performance.
Article
Energy & Fuels
Shu Zheng, Hao Liu, Dengke Li, Zirui Liu, Bo Zhou, Qiang Lu
Summary: With the development of high-load and high-pressure combustion equipment, it is crucial to enhance the accuracy of laminar burning velocity prediction under elevated pressures. In this study, a Statistical Narrow-Band (SNB) model of methane at elevated pressures was constructed using the HITRAN 2016 database, and the impact of radiation reabsorption on burning velocity was investigated.
Article
Energy & Fuels
Yada Leo, Bo Zhang
Summary: The study investigates the explosion behavior and Rayleigh-Taylor instability of methane-air mixtures. Results show that increasing initial pressure leads to higher maximum explosion pressure, while flame speed and laminar burning velocity decrease. Ignition feasibility and delay time are strongly related to reactant mass per unit volume and fuel composition, and RT instability causes flame structural instability.
Article
Chemistry, Physical
J. Grune, K. Sempert, M. Kuznetsov, T. Jordan
Summary: This paper presents experimental results on spherical and cylindrical flame propagation in pre-mixed H2/air-mixtures in different geometries, analyzing the structure and propagation of the flames. The study discusses self-acceleration phenomena in unconfined and unobstructed pre-mixed H2/air flames.
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.