Article
Energy & Fuels
Tao Yang, Wenan Deng, Yonghong Zhu, Shengjuan Zhang, Yaqing Liu, Xuan Zhang, Cheng Yang, Wei Li, Yifan Wang
Summary: This study conducted experiments to investigate the dynamic changes of asphaltenes and coke formations in slurry-bed hydrocracking reactions. The results showed that asphaltenes easily formed and condensed into large aromatic compounds, which played a crucial role in coke formation.
Article
Environmental Sciences
Tamal Kanti Ghosh, Pinakpani Biswas, Prasenjit Bhunia, Sameer Kadukar, Saroj Kumar Banerjee, Rita Ghosh, Supriya Sarkar
Summary: The treatment of coking wastewater has always been a challenge due to its complex and toxic nature. Various technologies such as biological treatment, advanced oxidation processes, and activated carbon treatment are available for removing color and organic contaminants from wastewater. However, due to challenges associated with existing methods, there has been a push towards developing new promising technologies, like using coke breeze for adsorption treatment, which has shown significant removal efficiencies for color and COD within a short time period.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Chemistry, Physical
Qiang Wu, Can Sun, Zi-Zong Zhu, Ying-Dong Wang, Chong-Yuan Zhang
Summary: The addition of B4C in HVC carbonization process was found to inhibit extensive condensation and crosslinking reactions by reducing active oxygen from thermally produced free radicals, while increasing secondary cracking reactions. This results in an increase in the size of the aromatic layer and anisotropic degree in coke structure, ultimately leading to improved coke quality.
Article
Energy & Fuels
Ya-fei Chen, Hong Yin, Dong-lin He, Hai-feng Gong, Zhe-zhi Liu, Yun-qi Liu, Xian-ming Zhang, Wan-fen Pu
Summary: This study investigates the evolution of low temperature oxidized coke generated from the pyrolysis of ultra-heavy oil during in-situ combustion. The results show that low temperature oxidation leads to the formation of oxidation groups and promotes the evolution of aromatic structures and functional groups. Additionally, low temperature oxidation reactions have a significant impact on the morphology, oxidizability, and exothermicity of the coke.
Article
Energy & Fuels
M. Wojtaszek, R. Wasielewski
Summary: The study demonstrates that adding waste ion exchange resins to coke can improve its mechanical strength, but may have adverse effects on quality parameters such as sulfur content and abrasion. Furthermore, chars created from WIER in the coke matrix are more reactive than coke matter originated from coal.
Article
Chemistry, Analytical
Qiao-Wei Wang, Qin-Li Shen, Xue-Gang Li, Wen-De Xiao
Summary: A 3D coupled CFD model was established to simulate the complex interaction between the heating and coking chambers in a commercial coking oven. The model included submodels for water evaporation and condensation, volatiles release, and coal blend porosity variation. Effects of heating flue configuration and coal blend property on the coking process were examined.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2023)
Article
Engineering, Chemical
Yan Wang, Qi Zhou, Qi Zhao, Sijian Qu, Yuming Zhang
Summary: Optimizing coal blending is crucial for the high-quality development of coking industries. This study focuses on understanding the relationship between coal characteristics and coke quality by investigating the influence of coal structures and properties on coke quality using four typical coals from Shanxi Province in China. The presence of macerals, especially vitrinite, greatly affects the thermal strength of coke. The thermal strength of coke B is superior to coke A due to the difference in the composition of desmocollinite and telocollinite. Coke B, C, and D exhibit good thermal properties with a CSR value higher than 60%. The plasticity and fluidity characteristics analyzed through Gieseler fluidity analysis reveal that a low initial softening temperature, wide plastic temperature range, smooth fluidity region, and appropriate maximum fluidity contribute to improved coke quality. The condensation degree and hydrogen bond play significant roles in the formation of plastic mass and coke thermal strength, with coal C and coal D showing more favorable properties compared to coal A. Thermal gravimetric-mass spectrometry and methane evolution analysis indicate that the volatile matter released during pyrolysis of coal A primarily comes from covalent bonds with higher bond energy, suggesting the stability of the chemical bonds in coal A.
Article
Energy & Fuels
Jun Zhao, Hong Liu, Haochen Zhang, Xiaolin Song, Haibin Zuo, Guangwei Wang, Zhigao Xu, Ming Wu, Zhenyue Zhang, Ru'an Chi
Summary: This study focuses on the utilization of low-rank coal and biomass residue in the coking process. Hypercoal, produced through co-thermal extraction, was investigated as a component in the coking process. The study found that the inclusion of 15% hypercoal in the coal blend resulted in improved compressive and drum strengths of the coke. Furthermore, the high vitrinite content in hypercoal contributed to the formation of mosaics within the coke, enhancing its cold strength.
Article
Green & Sustainable Science & Technology
Lina Kieush, Andrii Koveria, Johannes Schenk, Kanay Rysbekov, Vasyl Lozynskyi, Heng Zheng, Azamat Matayev
Summary: This paper studies the impact of nine industrial coal blends on coke quality using petrographic analysis and discusses the efficient use of coals and preparation of coal mixtures in industrial conditions for sustainable cokemaking. The research indicates that the petrographic properties of coal blends are reliable parameters for assessing coke quality under conditions of unstable raw material base, multi-component blends, and changes in coking regimes.
Article
Engineering, Environmental
Xinyu Gao, Huan Zhang, Yanqiu Wang, Haiyang Wang, Yin Tang, Yang Hu, Yanli Lv, Jinfeng Bai
Summary: A novel electro-Fenton cathode was prepared from needle coke loaded with ferrous ions (Fe/NC/Ti) for treating coking wastewater. The preparation conditions and factors affecting the treatment were investigated. The Fe/NC/Ti cathode showed excellent catalytic effect with high removal rate of chemical oxygen demand (COD) and reduction of UV254 under optimal conditions. It also demonstrated good stability and efficient degradation of aromatic compounds in coking wastewater. The scale-up experiment confirmed its low energy consumption and high COD removal efficiency, making it a potential solution for coking wastewater degradation.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Analytical
Haowen Li, Xiaohan Wang, Qianshi Song, Zixin Yang, Wei Qi
Summary: Coke deposition during hydrocarbon pyrolysis was studied through unsteady-state experiments of n-heptane in regenerative cooling channels. The results revealed three distinct stages of coking, with changes in morphology, elemental composition, and oxidative activity of the coke. Metallic substances in the coke indicated catalytic effects and carburization corrosion, while the C/H ratio of coke showed variations with temperature and coking stage.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2022)
Article
Engineering, Environmental
Xinyu Gao, Yanqiu Wang, Yang Hu, Yixian Wang, Yuting Guo, Chang Zhou, Shiyong Wu
Summary: A novel needle coke-based gas diffusion electro-Fenton cathode (GDEFC) was successfully prepared using a catalytic layer and a gas diffusion layer. The GDEFC showed excellent performance in coking wastewater treatment, providing a reliable theoretical and experimental basis for practical applications.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Energy & Fuels
Michal Rejdak, Grzegorz Galko, Marcin Sajdak, Aleksandra Wieczorek
Summary: This study examines the impact of selected coal properties on the effectiveness of stamping operation by measuring the bulk density of stamped coal cake. An empirical mathematical model was developed to forecast coal cake density based on various coal parameters and stamping energy. The results show that density increases with stamping energy, specific coal particle diameter, ash content, and moisture content, while it decreases with volatile matter content.
Article
Energy & Fuels
Apsara S. Jayasekara, Brody Brooks, Karen Steel, Pramod Koshy, Kim Hockings, Arash Tahmasebi
Summary: The steel industry is responsible for about 7% of global greenhouse gas emissions, and replacing coal with microalgae biomass for coke production can have a positive impact on reducing CO2 emissions.
Article
Energy & Fuels
Yanhong Wang, Yongzhao Zhou, Shuanshi Fan, Xuemei Lang, Gang Li
Summary: The coking characteristics of heavy oil play a crucial role in the in situ combustion process. After low temperature oxidation, the pyrolysis coking characteristics of heavy oil change significantly, resulting in a higher coke yield but lower oxidation activity and heat value.
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.