Article
Thermodynamics
M. B. Raida, G. J. Hoetmer, A. . A. . Konnov, J. A. van Oijen, L. P. H. de Goey
Summary: A new setup for burning velocity measurements using the Heat Flux method has been constructed, with improved burner design. The experimental results have high accuracy and good agreement with literature data.
COMBUSTION AND FLAME
(2021)
Article
Thermodynamics
Shixing Wang, Zhihua Wang, Chenlin Chen, Ayman M. Elbaz, Zhiwei Sun, William L. Roberts
Summary: This study focuses on the combustion of NH3 blended fuels under elevated pressure conditions and proposes a new kinetic mechanism (CEU-NH3-Mech-1.1) based on experimental results. The new mechanism shows good predictability for laminar flame speed, ignition delay time, and species concentration in ammonia oxidation at high temperatures. Additionally, the study reveals the variation of pressure exponent with ammonia content and its role in validating kinetic mechanisms.
COMBUSTION AND FLAME
(2022)
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)
Article
Energy & Fuels
Sven Eckart, Chris Fritsche, Cornelius Krasselt, Hartmut Krause
Summary: Premixed flames are important in combustion systems such as aircraft combustors, gas turbines, and internal combustion engines. Oxygenated fuels like C-1-oxygenate dimethoxymethane have advantages in reducing soot particles in diesel combustion processes.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Thermodynamics
Jundie Chen, Marco Lubrano Lavadera, Alexander A. Konnov
Summary: In this study, new measurements of the laminar burning velocity of ammonia + oxygen + argon mixtures were performed and validated against nine kinetic models. It was found that the models by Han et al., Shrestha et al., and Okafor et al. provided the best predictions. The model of Han et al. was modified to better reproduce the experimental data.
COMBUSTION AND FLAME
(2023)
Article
Energy & Fuels
Di Hou, Zunhua Zhang, Qian Cheng, Biao Liu, Mengni Zhou, Gesheng Li
Summary: The present study expands the database of laminar burning velocities for ammonia combustion and investigates the effect of N-2 addition on N-2 and NOx production. The results show that N-2 dilution decreases the laminar burning velocities and NOx concentration in NH3/O-2/N-2 flames, and the chemical effects dominate the inhibition of N-2 production at N-2 dilution rates below 0.3.
Article
Energy & Fuels
Ya Li, Yong Jiang, Wu Xu, K. M. Liew
Summary: In this study, the combustion characteristics and stability of 2-butanone were investigated experimentally and theoretically. It was found that the laminar burning velocity and Markstein length of 2-butanone decreased with increasing pressure. The experimental data were well predicted by the applied kinetic models. The onset of cellular instability of 2-butanone flames was influenced by both pressure and equivalence ratio.
Article
Thermodynamics
Qianjin Lin, Xianzhong Hu, Jundie Chen, Alexander A. Konnov
Summary: In this study, laminar burning velocities of MIPK + air flames were measured, and it was found that existing kinetic models for MIPK combustion deviate from the measured data. The MIPK model was updated and a new di-methyl ketene sub-model was integrated, improving predictions of burning velocities and ignition delay times. Underestimation of the rate constants of the MIPK decomposition reaction in the previous model was identified, leading to underestimation of the measured burning velocities and significant overprediction of the ignition delay times.
COMBUSTION AND FLAME
(2023)
Article
Energy & Fuels
Runfan Zhu, Xinlu Han, Ziyue Zhang, Yong He, Zhihua Wang
Summary: This study investigates the laminar burning velocities of NH3/CH4/H2S/air flames and explores the effect of H2S addition on flame propagation. The experimental results show that H2S addition decreases the flame speed, and the kinetic analysis reveals that the elevated H2S content significantly impacts the radicals pool in the flame. Reactions involving S-containing species become important for flame speed determination under high H2S content.
Article
Chemistry, Physical
Bao-zhi Jin, Yong-Feng Deng, Guo-xiu Li, Hong-meng Li
Summary: Ammonia is a carbon-free fuel with ideal production and storage systems, showing great research prospects. Experimental data revealed that the laminar burning velocity of NH3/H-2/air flame increases with increasing hydrogen ratios and temperature, but decreases with increasing pressure. The equivalent ratio of the maximum laminar burning velocity is only affected by the proportion of reactants.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Thermodynamics
Marco Lubrano Lavadera, Jundie Chen, Alexander A. Konnov
Summary: This study experimentally determined the adiabatic laminar burning velocities for pyrrole/air flames and conducted a comparison between experimental and computational results. The model performance was improved by modifying a reaction rate constant, and the discrepancies among different models were observed.
COMBUSTION AND FLAME
(2022)
Article
Thermodynamics
Marco Lubrano Lavadera, Matteo Pelucchi, Alexander A. Konnov
Summary: Blending ammonia with methylcyclohexane and toluene results in a non-proportional decrease in laminar burning velocity, with a slightly larger impact on toluene. A detailed kinetic model accurately predicts the experimental measurements after minor modifications to the chemistry and shows good agreement with the effect of equivalence ratio and ammonia fraction ranges investigated.
COMBUSTION AND FLAME
(2022)
Article
Energy & Fuels
Lulu Yin, Wu Xu, Yong Hu, Yong Jiang
Summary: Ethyl methyl carbonate (EMC) has been extensively studied for its potential applications in liquid fuels and Li-ion cell electrolytes. The combustion characteristics of EMC/air premixed flames were investigated in a constant-volume combustion chamber, showing pressure-dependent flame instability and thermal-diffusive instabilities for lean and rich flames, respectively. A chemical kinetic mechanism accurately predicted the flame propagation at lower pressures but underestimated the flame velocity at higher pressures for lean mixtures.
Article
Energy & Fuels
Marco Lubrano Lavadera, Christian Brackmann, Gianluca Capriolo, Torsten Methling, Alexander A. Konnov
Summary: Experimental results on the adiabatic laminar burning velocities and post-flame NO mole fractions of neat and blended ethanol and n-heptane premixed flames demonstrate that the addition of ethanol increases the burning velocity and reduces NO formation. These findings are crucial for the development and optimization of chemical kinetic models.
Article
Thermodynamics
Xinlu Han, Zhihua Wang, Yong He, Yanqun Zhu, Alexander A. Konnov
Summary: This study investigated the laminar burning velocities of CH4 + H2S + air flames and highlighted the importance of interactions between C and S-containing species, proposing solutions for handling hydrogen sulfide.
COMBUSTION AND FLAME
(2022)
Article
Energy & Fuels
Zhihua Wang, Xinlu Han, Yong He, Shixing Wang, Ran Ji, Yanqun Zhu, Kefa Cen
Article
Thermodynamics
Xinlu Han, Zhihua Wang, Yong He, Shixing Wang, Yanqun Zhu, Yingzu Liu, Alexander A. Konnov
Summary: The study proposes a projection procedure to obtain laminar burning velocity at different unburned gas temperatures, effectively addressing the issue of data scattering caused by high unburned gas temperatures. Experimental results show good agreement with the proposed equations, indicating the potential extension of the projection method to other flame characteristics.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2021)
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
Marco Lubrano Lavadera, Xinlu Han, Alexander A. Konnov
Summary: Experimental results showed that adding ammonia to methane, n-heptane, and iso-octane decreases the laminar burning velocity, and this reduction is not proportional to the ammonia mole fraction. Ammonia has a similar impact on the burning velocities of n-heptane and iso-octane, but slightly higher effect on methane. The reduction in burning velocity is due to synergistic thermal, kinetic, and indirect transport effects.
Article
Thermodynamics
Shao Xuefeng, Yang Sheng, Chen Chenlin, Fan Liwu, Yu Zitao
Summary: The rheological behaviors of five binary eutectic mixture sugar alcohols for latent heat storage were studied, showing that these behaviors depend on the pure compounds and molar ratios. Different mixtures exhibit different rheological properties, which can have varied effects on their performance during latent heat retrieval.
JOURNAL OF THERMAL SCIENCE
(2021)
Article
Thermodynamics
Xinlu Han, Marco Lubrano Lavadera, Alexander A. Konnov
Summary: In this study, the laminar burning velocities of NH3+N2O+air flames were measured experimentally, showing a linear relationship with the fraction of nitrous oxide in the oxidizer mixture. Comparison with recent NH3 mechanisms revealed that the models of Nakamura et al. and Stagni et al. performed the best. The authors' H/N/O kinetic mechanism was updated and showed improved agreement with experimental data and literature.
COMBUSTION AND FLAME
(2021)
Article
Thermodynamics
Zhihua Wang, Xinlu Han, Yong He, Runfan Zhu, Yanqun Zhu, Zhijun Zhou, Kefa Cen
Summary: The laminar burning velocities of ammonia blended with methanol/air and ethanol/air flames were studied, a new kinetic mechanism was proposed and validated, and it was found that interactions between C- and N-containing species are insignificant for the laminar burning velocities of various ammonia blending mixtures.
COMBUSTION AND FLAME
(2021)
Article
Thermodynamics
Shixing Wang, Zhihua Wang, Chenlin Chen, Ayman M. Elbaz, Zhiwei Sun, William L. Roberts
Summary: This study focuses on the combustion of NH3 blended fuels under elevated pressure conditions and proposes a new kinetic mechanism (CEU-NH3-Mech-1.1) based on experimental results. The new mechanism shows good predictability for laminar flame speed, ignition delay time, and species concentration in ammonia oxidation at high temperatures. Additionally, the study reveals the variation of pressure exponent with ammonia content and its role in validating kinetic mechanisms.
COMBUSTION AND FLAME
(2022)
Article
Energy & Fuels
Shixing Wang, Zhihua Wang, Ayman M. Elbaz, Yong He, Chenlin Chen, Yanqun Zhu, William L. Roberts
Summary: The study found that increasing the hydrogen mole fraction or decreasing the CO2 mole fraction in the fuel can increase the combustion speed of syngas under high pressure conditions. CO2 dilution and CH4 addition were shown to decrease the overall reaction order of syngas flames by reducing the adiabatic flame temperature, leading to lower flame speeds.
Article
Thermodynamics
Chenlin Chen, Zhihua Wang, Zuochao Yu, Xinlu Han, Yong He, Yanqun Zhu, Alexander A. Konnov
Summary: This study investigates the potential flame enhancement method in plasma-assisted combustion using ozone as an additive. The results show that ozone addition significantly affects the burning velocity of premixed ammonia gases, especially under fuel-rich conditions. The effects of ozone addition on the laminar burning velocity were experimentally and numerically investigated under various equivalence ratios.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2023)
Article
Thermodynamics
Xinlu Han, Zhihua Wang, Yong He, Yanqun Zhu, Alexander A. Konnov
Summary: This study investigated the laminar burning velocities of CH4 + H2S + air flames and highlighted the importance of interactions between C and S-containing species, proposing solutions for handling hydrogen sulfide.
COMBUSTION AND FLAME
(2022)
Review
Energy & Fuels
Yiya Wang, Xinlu Han, Jinyu Li, Ruiqi Liu, Qi Wang, Chenxing Huang, Xinwei Wang, Riyi Lin, Liqiang Zhang
Summary: Despite the growth of renewable energy, global oil demand is increasing. Oil displacement technologies, such as water flooding and chemical flooding, are being studied and applied to extract more oil and recover unconventional reserves. However, challenges remain in terms of corrosion and damage to equipment and reservoirs. Experimental and numerical research are needed to address these challenges and improve the accuracy and application range of oil displacement technology. Future research should focus on mechanisms such as impurities' influence, combining different oil displacement technologies, and the micro/nanoscale coupling mechanisms of thermal-hydro-mechano-chemical processes.
Article
Energy & Fuels
Xinlu Han, Zhihua Wang, Riyi Lin, Alexander A. Konnov
Summary: This study investigates the phenomenon of SAFT in the CH4 + O2 + N2 and NH3 + O2 + N2 flames and examines the relationship between SAFT and laminar burning velocities. Experimental measurements and simulations reveal different SAFT regimes for CH4 and NH3 flames, and demonstrate the connection between SAFT extent and laminar burning velocity.
Article
Energy & Fuels
Chenlin Chen, Zhihua Wang, Runfan Zhu, Jiaxin Tan, Yong He, Kefa Cen
Summary: This study investigates the effects of coal type, NH3 injection mode, temperature, excess air ratio (alpha), and NH3 co-firing ratio (ENH3) on combustion characteristics and fuel-N transformation of ammonia/pulverized coal. The results show that ammonia co-firing can reduce CO emissions and convert fuel-N to N2. From the perspective of emission control and decarbonization, an ENH3 = 40% is the optimal ammonia co-firing ratio for reducing CO2 emissions and minimizing fuel-N conversion ratio and residual NH3.
Article
Energy & Fuels
Yiya Wang, Chuantao Zhu, Liqiang Zhang, Xinlu Han, Jinyu Li, Chenxing Huang, Qiwei Dong, Ruiqi Liu, Xinwei Wang, Riyi Lin
Summary: This study investigated the mechanism of hydrogen sulfide generation during low temperature hot water flooding, and found that thermochemical sulfate reduction (TSR) was the primary reaction type. TSR was directly proportional to reaction temperature and time, while inversely proportional to reaction pH. TSR consumed the saturated fraction in heavy oil and converted inorganic sulfur to organic sulfide. This study provides new insights into the low temperature TSR reaction mechanism and the origin of H2S, which are important for understanding and mitigating risks during heavy oil recovery.
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.