Review
Thermodynamics
Christian Hasse, Paulo Debiagi, Xu Wen, Klaus Hildebrandt, Michele Vascellari, Tiziano Faravelli
Summary: Research on clean coal technologies requires experimental methods and computational tools, especially 3D computational fluid dynamics (CFD) simulations which can provide detailed information on complex systems.
PROGRESS IN ENERGY AND COMBUSTION SCIENCE
(2021)
Article
Engineering, Environmental
Daiwei Ouyang, Kaiyun Liu, Qingru Wu, Shuxiao Wang, Yi Tang, Zhijian Li, Tonghao Liu, Licong Han, Yuying Cui, Guoliang Li, Deming Han
Summary: Coal preparation effectively reduces primary mercury emissions by altering mercury flows, but secondary emissions may occur during the combustion of byproducts. Uncertainty in evaluating the impact of coal preparation in China stems from inconsistent statistics, unclear mercury distribution characteristics, and limited information on byproduct utilization pathways.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Energy & Fuels
Jianping Yang, Qin Li, Wenbing Zhu, Wenqi Qu, Min Li, Zhengyong Xu, Zequn Yang, Hui Liu, Hailong Li
Summary: This study utilized the abundant mineral chalcopyrite as an efficient trap for Hg-0 sequestration, showing excellent removal performance in a wide temperature range and minimal interference from typical flue gas components. The adsorption capacity and rate of CuFeS2 were significantly higher than commercial activated carbons, attributed to the oxidizing and immobilizing abilities of disulfide ligands, and the sorbent could be regenerated through thermal decomposition, saving operation costs. CuFeS2 is identified as a potential, cost-effective trap for efficient remediation of Hg-0 from coal combustion flue gas.
Article
Chemistry, Applied
Ruiqi Mu, Ming Liu, Junjie Yan
Summary: Supercritical water gasification (SCWG) is a promising technique to convert coal into hydrogen-rich syngas. Advanced exergy analysis shows that SCWG has a higher exergy efficiency compared to conventional (CG) and chemical looping gasification (CLG). The gasifier in SCWG process has the highest irreversibility caused by gasification reaction, but also has a high potential for avoidable exergy destruction. Additionally, parameters such as coal water slurry concentration (CWSC), gasification temperature, gasification pressure, and oxygen-coal ratio have significant effects on the performance of SCWG.
FUEL PROCESSING TECHNOLOGY
(2023)
Article
Environmental Sciences
Zhaochen Shi, Yixiang Shu, Zongyi Wang, Hui Mao, Jiaye Zhang, Houzhang Tan, Xuebin Wang
Summary: Coal gasification is an effective method for clean and efficient utilization of coal, and the by-product of coal gasification, coal gasification fine slag, has high carbon content, large specific surface area, developed pore structure, and high output. Combustion has become an effective large-scale disposal method for coal gasification fine slag, and the fine slag after combustion can be further used as construction raw materials. This study investigated the emission characteristics of gas-phase pollutants and particulate matter under different combustion conditions, and found that co-firing coal gasification fine slag with raw coal can reduce submicron particle emission and total emission of gas-phase pollutants. Elemental analysis showed that furnace temperature and O2 concentration significantly influenced the formation of submicron particles.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Energy & Fuels
Chuandong Ma, Xiaoteng Li, Jianqiao Lyu, Meng He, Zhenhua Wang, Lin Li, Xiaofang You
Summary: The effects and mechanisms of CGFS-CWS preparation, combustion, and ash fusion were investigated. Increasing CGFS content led to higher slurry viscosity but improved slurry stability. The improved stability was attributed to the stronger negative charge on the CGFS surface, facilitating particle dispersion. Combustion experiments showed that CGFS incorporation significantly lowered the burnout temperature and increased the maximum combustion rate of the slurry. Addition of CGFS also reduced the ash fusion temperature by promoting melting-assisting effects.
Review
Energy & Fuels
Dunyu Liu, Chaoran Wang, Yunpei Fan, Qiuqi Liu, Xudong Wang, Kailong Xu, Jing Jin, Jingjing Ma, Jinchen Ma
Summary: Chemical looping combustion (CLC) of coal for carbon capture utilization and storage is an effective technology to reduce carbon emission. However, there is uncertainty in mercury emission from both air and fuel reactor. This paper aims to reveal the mechanisms for the transformation of mercury-related species.
Article
Energy & Fuels
Jingzhang Liu, Yuhua Liu, Jianguo Zhu, Ziqu Ouyang, Chengbo Man, Shujun Zhu, Yi Zhang, Qinggang Lyu
Summary: This study utilized advanced combustion techniques to achieve original ultra-low NOx emissions and high combustion efficiency.
Article
Energy & Fuels
Dikun Hong, Liang Liu, Chunbo Wang, Ting Si, Xin Guo
Summary: An atomistic coal char representation was constructed via ReaxFF MD simulation, investigating the combustion and gasification characteristics of the char. The activation energies obtained for various reactions were in good agreement with experimental data, revealing the generation of large amounts of C2 species during char-H2O gasification.
Article
Engineering, Environmental
Jinhao Zheng, Lei Liao, Rui Liu, Chongcong Li, Yan Zhang
Summary: This study explored a promising approach to co-manage torrefaction condensates (TCs) and carbon-rich fly ash (FA), finding that the blending of FA and TC improved CO2 gasification reactivity and combustion performance of the resulting mixtures.
Article
Energy & Fuels
Mei An, Nini Yuan, Qingjie Guo, Xianyong Wei
Summary: This study investigated the effect of CuFe2O4 on the removal of Hg0 in coal gasification using experimental and thermodynamic techniques. The results showed that CuFe2O4-modified bentonite had better adsorption capacities for Hg0 and could convert more Hg0 into Hg2+ and particulate mercury. The thermodynamic simulation and DFT results further confirmed the favorable conversion of Hg0 with CuFe2O4-modified bentonite.
Article
Thermodynamics
Christopher R. Shaddix, Ethan S. Hecht, Cristina Gonzalo-Tirado, Brian S. Haynes
Summary: Previous research has shown that CO2 and H2O gasification reactions play a significant role in the combustion of pulverized coal (pc) char, especially in oxy-fuel environments. This study aims to quantify the influence of CO2 gasification reaction by combining experimental measurements and simulations. The results demonstrate a consistent relationship between the gasification reaction rate and the char particle temperatures and burnout rates in oxy-fuel combustion environments.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2023)
Article
Green & Sustainable Science & Technology
Wenjuan Zhao, Yaping Chen, Jiafeng Wu, Zilong Zhu, Jun Wang
Summary: The proposed gas steam mixture power cycle with syngas from supercritical water coal gasification (GSMC-C) provides a reference for retrofitting existing coal-fired power plants into clean and efficient power plants with nearly zero emissions of CO2 and other pollutants. The cycle shows promising performance with a net efficiency of 41.96% and gross efficiency of 48.67%, indicating its potential for contributing to the goals of the Paris Agreement and carbon neutrality.
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
(2021)
Article
Chemistry, Multidisciplinary
Dan-lu Pan, Wei-ting Jiang, Rui-tang Guo, Yang Huang, Wei-guo Pan
Summary: The combustion characteristics of waste tire powders, bituminous coal, and their blends were studied using a thermogravimetric analyzer. An increase in heating rate led to higher combustion temperature of tire powders but reduced maximum weight loss rate. Blends of coal and tire powders exhibited characteristics similar to their individual components, indicating minimal interaction effects between the two materials.
Article
Engineering, Chemical
Chuandong Ma, Zhisen Li, Wenqi Zhang, Meng He, Qingbiao Wang, Zhenhua Wang, Lin Li, Xiaofang You
Summary: In this study, hydrocarbon oil was used to modify coal gasification fine slag, enhancing its hydrophobicity and improving the flowability of the resulting coal-water slurry. The addition of hydrocarbon oil also reduced the ignition temperature of the slurry. These findings suggest that hydrocarbon oil modification is beneficial for enhancing the properties of coal gasification fine slag and its slurry.
ADVANCED POWDER TECHNOLOGY
(2023)
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.