Article
Thermodynamics
Yanyu Qiao, Zhichao Chen, Xiaolan Wu, Zhengqi Li
Summary: This paper investigates the combustion, thermal conversion, and kinetic analyses of semi-coke blending with bituminous coal under oxygen-enriched conditions. The ignition and burnout temperatures are reduced under 30% O2 atmosphere compared to 20% O2 atmosphere. Oxygen-enriched conditions can effectively improve the combustion performance of the mixture. The synergy effect of the co-combustion process is different under different oxygen atmospheres.
Article
Chemistry, Applied
Yonghong Yan, Rui Sun, Liutao Sun, Wenkun Zhu, Dengke Chen
Summary: This study evaluated the effect of primary air velocity on the ignition characteristics of bituminous coal and semicoke mixture, indicating that convection heating was more important than radiant heating for fuel ignition. The optimized flame stability was achieved at a primary air velocity of 18 m/s, and a recommended PAV of no more than 22 m/s for co-firing bituminous coal with a large proportion of semicoke.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Energy & Fuels
Ye Yuan, Yong He, Jiaxin Tan, Yongmeng Wang, Sunel Kumar, Zhihua Wang
Summary: This study investigated the co-combustion characteristics of coal and biomass blends using thermogravimetric analysis and found that increasing the biomass percentage improved combustion performance. A 20% blending ratio was identified as the optimal percentage for co-utilization of coal-biomass blends.
FRONTIERS IN ENERGY RESEARCH
(2021)
Article
Energy & Fuels
Chang'an Wang, Qinqin Feng, Qisen Mao, Chaowei Wang, Guangyu Li, Defu Che
Summary: Co-firing bituminous coal under oxy-fuel conditions can improve the ignition and combustion performances of ultra-low volatile carbon-based fuels and effectively control pollutants. Increasing the oxygen concentration is effective in enhancing the combustion performances of ultra-low volatile fuels. The addition of bituminous coal significantly reduces the activation energy of ultra-low volatile fuels to improve co-firing performances.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2021)
Article
Thermodynamics
Ruidong Zhao, Jianguang Qin, Tianju Chen, Jinhu Wu
Summary: The combustion behaviors and pollutants emission characteristics during co-combustion of bituminous coal semicoke and lignite were investigated. The addition of lignite improved the combustion performance and high heating rate increased the combustion intensity. The lignite blend ratio affected the combustion process and emission characteristics.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Chemistry, Applied
Kai Geng, Yukai Li, Bowen Li, Shaozeng Sun, Yangzhou Guo, Yijun Zhao, Wenda Zhang
Summary: This study used a micro fluidized bed reaction analysis system to investigate the oxidation kinetics of bituminous coal char. Important parameters were measured, and the transition temperatures of the combustion control zone were determined. The results have significant implications for improving the oxidation reaction model.
FUEL PROCESSING TECHNOLOGY
(2023)
Article
Chemistry, Applied
Thomas Allguren, Klas Andersson, Andrew Fry, Eric G. Eddings
Summary: This study investigated the combustion behavior of biomass with different pre-treatments and studied the formation of NOx in co-firing experiments. The results showed that the amount of fuel-bound nitrogen in coal is higher than that in biomass fuels, resulting in higher NO formation. Further analysis revealed that the distribution of volatile nitrogen species varied in the biomass co-firing cases, which was suggested as the main reason for the observed difference in NO formation.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Energy & Fuels
Yaqiang Yuan, Haibin Zuo, Jingxiu Wang, Yan Gao, Qingguo Xue, Jingsong Wang
Summary: In this study, the co-combustion characteristics and ash fusion temperatures of clean coal, biomass pellet, and their blends were investigated. The results show that mixing the two fuels improves their combustion performance with an obvious synergistic effect. The best effect was achieved when the biomass pellet mixing ratio was 60%. Increasing the heating rate promotes synergy. Through analyzing the properties of the ash, it was determined that a biomass blending ratio of 40-60% is most conducive to the efficient utilization of the two fuels.
Article
Energy & Fuels
Cai-ping Wang, Yin Deng, Yu-tao Zhang, Yang Xiao, Jun Deng, Chi-Min Shu
Summary: The study explored the changes during the coal cooling process in a closed fire zone by examining the oxidation characteristics of heating and cooling processes. Results showed that oxygen consumption during the cooling process was higher and related to lower oxygen concentration. Additionally, coal temperature affected the magnitude of apparent activation energy, and oxygen concentration impacted the oxidation activity of coal in the oxidation kinetics of coal.
Article
Energy & Fuels
Chang'an Wang, Yujie Hou, Qinqin Feng, Chaowei Wang, Xinyue Gao, Defu Che
Summary: The study investigates the co-combustion of ultra-low volatile carbon-based fuels (LVFs) and bituminous coal under oxy-fuel condition to reduce NOx emission and achieve CO2 capture. Results indicate that NOx emission increases as the fraction of bituminous coal decreases. The co-combustion characteristics are influenced by the oxidizing gas distribution method and fuel properties, and premixed combustion and in-furnace blending are effective in reducing NOx. It is recommended to maintain an O2 concentration of 27% to 30% during oxy-fuel combustion, while also reducing the secondary oxidizing gas flow in the semi-coke layers. This research contributes to the efficient and environmentally-friendly utilization of LVFs and enhances understanding of CO2 capture and carbon neutrality in electricity generation.
Article
Energy & Fuels
Daniela Guajardo, Fabiola Valdebenito, Juan Diaz, Gerald Cifuentes, Laura Azocar
Summary: The carbonization of Nannochloropsis gaditana microalgae biomass can produce bio-coal similar to bituminous coal, offering a potential alternative for biofuel production. Optimizing the fixed carbon index (FCindex) during carbonization allows for increased fixed carbon content without significantly affecting bio-coal yield. Further studies are needed to investigate high ash content in the final product and potential improvements through optimized conditions and washing steps.
Article
Green & Sustainable Science & Technology
M. F. Vega, L. Florentino-Madiedo, E. Diaz-Faes, C. Barriocanal
Summary: Hydrothermal carbonisation (HTC) is an environmentally advantageous method to pretreat biomass feedstocks. This study found that lower pH levels promoted the production of more condensed and aromatic hydrochars and affected the ash chemistry of the hydrochars. Additionally, adding hydrochar samples can decrease the reactivity of the resulting biocokes.
Article
Green & Sustainable Science & Technology
Rumaisa Tariq, Yasmin Mohd Zaifullizan, Arshad Adam Salema, Atiqah Abdulatif, Loke Shun Ken
Summary: Co-pyrolysis and co-combustion of orange peel, oil palm shell, and empty fruit bunch biomass were studied using a thermogravimetric analyzer. Blending different biomasses altered the thermogravimetry and derivative thermogravimetry profiles, indicating multiple reactions. Biomass blends showed a strong synergetic effect during char formation.
Article
Energy & Fuels
Mingqiu Wu, Haitao Li, Liang Wang, Shan Feng, Yu Wang, Ning Yang, Kai Wang, Minggao Yu
Summary: This study investigates the combustion characteristics, interaction, combustion reaction model, and kinetic parameters of coal/gangue co-combustion. The results reveal the effects of different mixing ratios on the combustion behavior and establish a predictive model for co-combustion.
Article
Energy & Fuels
K. B. Larionov, K. V. Slyusarskiy, I. V. Mishakov, S. A. Tsibulskiy, R. B. Tabakaev, A. A. Vedyagin, A. A. Gromov
Summary: The combustion process of coal samples loaded with different copper salts was studied in this research. It was found that the addition of copper salts decreased the ignition delay time, lowered the minimum ignition temperature, and reduced the formation of CO, leading to more complete oxidation of the fuel with the generation of CO2.
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.