Article
Thermodynamics
Bowei Zhang, Simao Guo, Hui Jin
Summary: This paper experimentally studied the effects of temperature, concentration, and residence time on gasification products and employed a BP neural network regression model for prediction. The results showed that the single-layer neural network had better fitting effect and significantly outperformed the linear regression model in predicting the gas products.
Article
Energy & Fuels
Libo Lu, Wenwen Wei, Fan Liu, Zhiwei Ge, Hui Jin, Yunan Chen, Liejin Guo
Summary: Supercritical water gasification (SCWG) is a promising technology for the treatment of black liquor and energy recycling. However, the transformation of sulfur during the SCWG process is not well understood. In this study, the effects of different parameters on gasification and sulfur transformation were investigated. The results showed that reaction temperature played a crucial role, and H-2 was the most important gaseous product. After SCWG treatment, sulfur mainly existed in the form of sulfide. The findings of this study provide a basis for the resource utilization of black liquor and a promising method for sodium sulfide production.
Article
Engineering, Environmental
Shi Liu, Wen Cao, Yu Wang, Wenwen Wei, Linhu Li, Hui Jin, Liejin Guo
Summary: This study investigates the behavior of nitrogen during chicken manure gasification in supercritical water, and reveals that temperature plays a crucial role in nitrogen transformation and distribution. The carbon gasification efficiency reaches 92.66%, and no NOx is detected in the gaseous products. As temperature increases, nitrogen is mainly transferred to the liquid phase, accompanied by the conversion of organic nitrogen to inorganic nitrogen. The study also uncovers the migration pathways of nitrogenous intermediates, providing a theoretical foundation for targeted removal of nitrogen components during the supercritical water gasification of high-nitrogenous biomass.
Article
Engineering, Chemical
Rui Zhang, Shuaiqi Zhao, Chengzhen Sun, Hui Jin, Kunpeng Zhao, Bofeng Bai
Summary: This study investigates the morphology evolution of lignite particles during supercritical water gasification, and finds that the sharpness of the particles has a significant impact on the gasification efficiency. The presence of high-sharpness structures promotes a particle conversion rate of up to 86.21%. Additionally, an optimized particle morphology of C-s < 0.74 and size D-0 < 1.5 mm achieves an average mass conversion rate of approximately 79.12% without the use of a catalyst.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Green & Sustainable Science & Technology
Linhu Li, Wen Cao, Gaoyun Wang, Pai Peng, Shi Liu, Hui Jin, Wenwen Wei, Liejin Guo
Summary: This study investigates the transformation behaviors of heavy metals during the supercritical water gasification (SCWG) of oily sludge. The results demonstrate that higher reaction temperature and longer residence time enhance gas yield. The heavy metals tend to deposit in the stable and environmentally harmless residual fraction. The study highlights the importance of transforming Zn ions in liquid residues to more stable forms.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Environmental Sciences
Linhu Li, Xujun Li, Wen Cao
Summary: This study investigates the transformation and distribution characteristics of heavy metals Cu, Cr, and Zn during the supercritical water gasification of oily sludge. Experimental results show that higher temperatures and the addition of Na2CO3 can effectively convert HMs into more stable forms and reduce pollution. Thermodynamic equilibrium analysis confirms these findings and provides insights into the molar fraction and distribution of stable HMs forms.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Green & Sustainable Science & Technology
Shi Liu, Wen Cao, Mingming Du, Wenwen Wei, Yunan Chen, Hui Jin, Liejin Guo
Summary: Supercritical water gasification (SCWG) of biomass waste is a valuable clean waste conversion technology due to its unique properties. This study investigated the transformation mechanism of nitrogen during the SCWG process using uric acid as a model compound. The effects of temperature and residence time on uric acid gasification and nitrogen behavior were explored, and a kinetic model was developed to describe the SCWG process.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Chemistry, Physical
Ali Karimi, Negar Kazemi, Omid Tavakoli, Azadeh Ebrahimian Pirbazari
Summary: This study investigated the supercritical water gasification of black liquor for hydrogen production, finding that the hydrogen yield could be enhanced by optimizing temperature and reaction time. The addition of heterogeneous catalysts and other biomass like wood residue and formic acid further improved the hydrogen production.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Review
Thermodynamics
Jingwei Chen, Qiteng Wang, Zhengyong Xu, E. Jiaqiang, Erwei Leng, Feng Zhang, Gaoliang Liao
Summary: Supercritical water gasification of coal is a promising clean coal conversion technology with advantages such as high efficiency and reduced emissions. However, achieving complete gasification at low temperatures remains a challenge, which can be addressed through factors like temperature, oxidant, and catalysts.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Green & Sustainable Science & Technology
Le Wang, Jia Chen, Jinhua Cui, Gaoyun Wang, Hui Jin, Liejin Guo
Summary: Supercritical water gasification offers an efficient and clean treatment for spent ion exchange resins, with high temperature, low concentration, K2CO3 catalyst addition, and long residence time promoting the gasification result. The carbon gasification efficiency reached 97.2% at 750 degrees C with 10 wt% concentration and K2CO3 catalyst addition. The main organic component residues in the liquid products were identified, and the reaction pathways and distributions of sulfur and nitrogen were discussed.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Energy & Fuels
Xinping Liang, Qiuyang Zhao, Yu Dong, Liejin Guo, Zhijun Jin, Quanyou Liu
Summary: The study found that temperature and time are the dominant factors affecting gas yield and selectivity, with increasing temperature promoting endothermic reactions and accelerating the water-gas shift reaction. Pressure increase has a less negative but negligible effect on gasification. In general, carbon gasification efficiency and hydrogen selectivity first increase and then stabilize when the reaction time is prolonged, and the water-shale mass ratio is increased and (or) the shale particle size is decreased.
Article
Engineering, Environmental
Hui Ge, Lei Yi, Yong Huang, Pai Peng, Wen Cao, Yu-nan Chen, Liejin Guo
Summary: This study systematically investigated the hydrogen production from fir bark via supercritical water gasification. The results showed that the highest gasification efficiency and selectivity were achieved at 700 degrees, 5 wt%, and 40 minutes. The gasification efficiency was positively related to the reaction temperature, and the effects of feedstock concentration and retention time were dependent on the reaction temperature. Increasing feedstock concentration promoted cyclisation and Diels-Alder reaction, leading to a stable aromatic structure. Prolonging retention time in the high temperature SCWG resulted in improved gasification efficiency.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Jialing Xu, Qing Miao, Zhiyong Peng, Shanke Liu, Yuegui Zhou, Lijun Yu
Summary: This study investigates the use of CO2 as a co-gasification agent in supercritical water gasification and provides valuable insights on designing an optimal process for syngas production.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Energy & Fuels
Deming Zhang, Bin Bai, Runyu Wang, Jiajing Kou, Wenwen Wei, Hui Jin, Liejin Guo
Summary: The study investigated the impact of K2CO3 and Al2O3 on ash agglomeration in coal SCWG, finding that K2Si2O5 plays a cohesive role between ash particles whereas Al2O3 can effectively solve this issue and enhance carbon gasification efficiency.
Article
Mechanics
Kun Jiang, Bowei Zhang, Weizuo Wang, Hui Jin
Summary: This study investigates the drag and heat transfer of subcritical and supercritical CO2 flowing over particles during the crossing of critical temperature. By using numerical simulation and analyzing the results, the researchers found that the drag coefficient and heat transfer depend on the operating conditions such as particle-surface temperature and pressure.
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.