Article
Energy & Fuels
Hongyu Lu, Shixiang Liu, Jiang Lv, Xin Li, Michael A. Delichatsios, Longhua Hu
Summary: This work investigates the flame geometrical characteristics of vertical downward turbulent jet fires in still air. The study proposes a new physical model and conducts CFD simulation to show the combustion structure. The research reveals the inner flow field and average mixture fraction of a downward jet fire and validates the CFD result with experimental data. It also discusses the differences between downward, upward, and horizontal jet fires and presents a physical model considering the initial downward momentum, flame buoyancy, and air entrainment.
Article
Energy & Fuels
Ruibang Sun, Juncai Wang, Xing Yang, Peng Chen, Liusuo Wu
Summary: In this study, experiments were conducted to study the geometric characteristics of transformer oil jet fire. The results show that the temperature boundary of jet flame varies between 600K to 700K, and the flame geometry can be approximated as a cylinder. The heat release rate is found to be related to the flame height to the power of 2/5, the flame width to the power of 1/3, and the flame volume to the 0.85 power of the heat release rate.
ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS
(2021)
Article
Engineering, Multidisciplinary
Islam M. Mesallam, Ahmed A. A. Attia, Khairy H. El-Nagar, Ismail M. M. Elsemary
Summary: In this study, a diffusion jet flame consisting of a newly developed flame holder with three coaxial pipes to transfer air and fuel to the combustion zone, is experimentally investigated to simulate the ramjet effect. The results showed that the secondary air exit location had an effect on the flame temperature distribution, flame shape, flame length, and flame width. The optimum position of the secondary air pipe was found above the datum line at Z5 = 7.5 mm, where the flame temperature and length are considered relatively high compared to other secondary air pipe positions.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Kuibin Zhou, Xuan Nie, Chao Wang, Yandong Wang, Huichang Niu
Summary: Gas-solid jet fires exhibit characteristics of large lift-off height, low visible flame height, and low radiative fraction. Sand particles act as a heat sink to decrease flame temperature and burning velocity, as well as dilute gas fuel and isolate surrounding oxygen to inhibit combustion. These effects result in a large lift-off height, especially with smaller particle size sand.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2021)
Article
Engineering, Environmental
Kuibin Zhou, Mengya Zhou, Mengyuan Huang, Yifan Wang
Summary: This paper presents a systematic investigation on the jet fire in a pit, including the variations of gas entrainment mode and flame behavior. A dimensionless heat release rate coupling the pit geometrical property is developed to correlate the flame area and length, which is validated by experimental data. Models for predicting the thermal radiation of the jet fire are proposed.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2022)
Article
Engineering, Environmental
Kuibin Zhou, Mengya Zhou, Mengyuan Huang, Yifan Wang
Summary: This paper systematically investigates jet fire in a pit (JFP) caused by the explosion of underground pipelines. The study observes different types of flames and develops correlations for flame length and width in various pits, as well as proposes models to predict thermal radiation. The research indicates that flame buoyancy becomes more significant than nozzle exit momentum as the nozzle exit velocity increases, leading to the evolution of JFP behavior.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2022)
Article
Energy & Fuels
Kai Xie, He Liu, Yunjing Cui, Gan Cui, Xingqi Qiu, Jianxin Wang
Summary: The safety of a horizontal spray combustion flame and the design of a heating device for a low-pressure area of a plateau have been widely examined. The shape equation and length of a flame's trajectory are the two most important indexes. The study demonstrates that maintaining rated volume air flow results in coinciding flame trajectories under different atmospheric pressures.
Article
Engineering, Chemical
Praveen Vijayan, Gireesh Kumaran Thampi, Pushpendra K. Vishwakarma, Adriana Palacios
Summary: This study investigates the relationship between the geometry of jet flames and the ambient conditions. The results show that reduced pressure leads to longer flame lengths and larger flame areas.
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
(2022)
Article
Engineering, Environmental
Liang Gong, Tianyu Mo, Xianwen Zheng, Yifei Han, Haoyu Wang, Xufeng Yang, Yuchun Zhang
Summary: This study investigates the fire hazards caused by coupled flames in oil-hydrogen integrated refueling stations. The experiments demonstrate that there is a critical diameter for hydrogen jet ignition, which is determined by the release pressure and location of the pool flame. The heat release rate of the coupled fire is higher than that of a single pool flame, and a prediction model is proposed for flame length and width. The temperature of the coupled fire reaches its peak at 0.2 oa and varies with nozzle diameter and distance.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Thermodynamics
Jinfei Zhao, Jiahao Liu, Haihang Li, Jian Wang
Summary: Experimental investigation on horizontal buoyancy-controlled jet fires was conducted to study the flame projection length under different ambient air pressures. It was found that the flame projection length increases with an increase in heat release rate and decreases with increasing ambient air pressure. The relationship between flame projection length and atmospheric pressure can be expressed as a power law.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Engineering, Environmental
Chunxiang Zhao, Xing Li, Xiaohan Wang, Min Li, Huahua Xiao
Summary: This paper experimentally studied the characteristics of H-2/CH4 jet flames at varied heat release rates (HRRs) with H-2 volume fraction (fv) ranging from 0% to 90%. The results showed that the flame height is affected by the increase in mixture molecular diffusivity, radicals pool, air entrainment, flame temperature, and jet velocity of fuel flow. A flame height model for H-2/CH4 flames was obtained through comparisons of different correlations.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Thermodynamics
Jiao Lei, Pengcheng Huang, Naian Liu, Linhe Zhang
Summary: This study investigates the effect of imposed circulation on the flame width of turbulent fire whirls and finds that the circulation strongly restricts flame pulsations in fire whirls compared to free buoyant flames. A semi-physical model is developed to describe the relationship between mean flame width and factors such as heat release rate and turbulence viscosity parameter.
COMBUSTION AND FLAME
(2022)
Article
Thermodynamics
Huaxian Wan, Yueyue Xiao, Shuqi Wei, Yuchun Zhang, Yasushi Oka
Summary: This study experimentally investigated the flame extension below the ceiling induced by two unequal square gaseous fires in a 1:10 scale tunnel. The flame length and tilt angle were analyzed based on the measured gas temperatures. A new model for flame length and a merging criterion were proposed. The results provide useful references for personal evacuation, fire rescue, and risk assessment in tunnels.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Thermodynamics
Yueqiong Wu, Kuibin Zhou, Mengya Zhou, Mengyuan Huang, Chao Wang, Juncheng Jiang
Summary: A new facility was used to model the jet flame ejected from the ruptured tank, and the geometrical features of the flame and radiant heat fluxes on the tank surface were measured. Two thermal radiation models were established to predict the radiant heat flux field. The prediction of the models agreed well with the experimental measurements.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Engineering, Mechanical
Kan Wang, Yang Ming, Hao Wang, Xiaolei Liu, Xinming Qian, Tingting Shi
Summary: This research conducts full-scale simulations on ejected fires inside containers with different container openings, using FLACS and validating the models with previous experiment data. The results show that the maximum width of upward flame has a negative correlation with corresponding height, while there is a positive correlation between flame width and heat release rate. Additionally, the spread thickness of upward flame decreases with container opening widened, and the maximum shows an uptrend with fire source's heat release rate enhancement. This study contributes to the determination of correlation relationships between container opening positions and maximum width/thickness of upward flame in shipping dangerous goods cargo fire.
ENGINEERING FAILURE ANALYSIS
(2023)
Article
Energy & Fuels
Qang Wang, Fei Tang, Huan Liu, Zheng Zhou, Adriana Palacios
Article
Thermodynamics
Qiang Wang, Longhua Hu, Adriana Palacios, Suk Ho Chung
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2019)
Article
Chemistry, Applied
Derek Bradley, Joaquim Casal, Adriana Palacios
Article
Thermodynamics
B. Rengel, A. Palacios
COMBUSTION AND FLAME
(2020)
Article
Engineering, Civil
Adriana Palacios, Derek Bradley
FIRE SAFETY JOURNAL
(2020)
Review
Engineering, Chemical
Adriana Palacios, Borja Rengel, Joaquim Casal, Elsa Pastor, Eulalia Planas
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2020)
Article
Energy & Fuels
B. Rengel, A. Agueda, E. Pastor, J. Casal, E. Planas, L. Hu, A. Palacios
Article
Engineering, Chemical
A. Palacios, B. Rengel
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
(2020)
Article
Energy & Fuels
A. Palacios, B. Rengel, Q. Wang, L. Hu
Article
Energy & Fuels
Adriana Palacios, Borja Rengel
Article
Chemistry, Physical
A. Palacios, A. Cordova-Lizama, P. M. Castro-Olivera, E. Palacios-Rosas
Summary: The use of hydrogen is increasing in many countries due to decarbonization and sustainable energy transition projects. This paper reviews the international panorama of hydrogen production, the main alternatives for hydrogen production in Mexico, and the applications of hydrogen in various areas. It analyzes the challenges and opportunities for Mexico to introduce hydrogen in new and existing processes, as well as the importance of public-private partnership and favorable investment conditions.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
A. Cordova-Lizama, C. Carrera-Figueiras, A. Palacios, P. M. Castro-Olivera, J. Ruiz-Espinoza
Summary: This study investigates the effects of zero valent iron nanoparticles (NZVI) and cobalt (CoNP) on hydrogen production from anaerobic digestion of waste activated sludge. The results show that the addition of NZVI and CoNP can significantly increase hydrogen yield and promote the anaerobic digestion process of waste activated sludge.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Engineering, Civil
Qiang Wang, Feng Guo, Adriana Palacios Rosas
Summary: In this study, experimental investigations were conducted to examine the intermittent flame lengths in both reduced and normal pressures. The results showed that the intermittent flame lengths were positively related to the heat release rate and nozzle diameter. Lower ambient pressure led to significantly higher intermittent flame lengths. Furthermore, a model was established to quantify the intermittent flame lengths in the reduced pressure environment.
FIRE SAFETY JOURNAL
(2023)
Article
Energy & Fuels
A. Palacios, W. Garcia, B. Rengel
Article
Engineering, Environmental
Hossein Mashhadimoslem, Ahad Ghaemi, Amir Hossein Behroozi, Adriana Palacios
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2020)
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.