Article
Energy & Fuels
Yan Xie, Xin Liu, Chaoqun Zhang, Heyang Wang
Summary: Cyclone-fired boilers have gained wide applications for burning low ash fusion temperature coals, but lack effective guidance for design and operation. This study developed a CFD model to investigate the aerodynamics and FGR optimization design of a cyclone-fired boiler, showing that adapted FGR design effectively eliminates high temperature zones.
Article
Energy & Fuels
Mohsen Abdelaal, Medhat El-Riedy, Ahmed M. El-Nahas, Fathy R. El-Wahsh
Summary: This experimental study investigates the effect of flue gas recirculation on non-premixed combustion for NOx reduction and CO2 capture and storage. The results show that flame stability can be improved with certain percentages of recirculated flue gas, leading to a reduction of NOx emissions but also causing a decrease in flame temperature.
Article
Thermodynamics
Kaiyang Li, Yimin Zeng, Jing-Li Luo
Summary: The study investigated the corrosion performance of three candidate alloys in high-temperature flue gas environments, finding that O-2 acted as the dominant oxidizing agent, H2O likely enhanced oxide growth, and CO2 did not trigger carburization during testing.
Article
Energy & Fuels
Joon Ahn, Hyouck-Ju Kim
Summary: A 0.5 MW oxy-fuel boiler was developed to capture CO2 from exhaust gas using natural gas as fuel, showing distinct characteristics from traditional pulverized coal boilers. Oxy-fuel combustion without FGR was examined, demonstrating stable flames with the inclusion of water vapor in the recirculated gas. The combustion resulted in over 90% CO2 capture while maintaining boiler performance and meeting exhaust gas regulations.
Article
Green & Sustainable Science & Technology
Maximilian von Bohnstein, Marcel Richter, Phillip Graeser, Martin Schiemann, Jochen Stroehle, Bernd Epple
Summary: The oxy-fuel process, using pure oxygen for combustion, is effective in capturing carbon dioxide, but requires recirculation of flue gas to control the high combustion temperatures. This results in increased carbon dioxide concentrations and water vapor in the flue gas, enhancing radiant heat transfer in the combustion chamber.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Article
Green & Sustainable Science & Technology
V. A. Kuznetsov, A. V. Minakov, D. M. Bozheeva, A. A. Dekterev
Summary: Numerical studies were conducted on oxy-fuel combustion of pulverized coal in an industrial boiler BKZ 500-140-1. A comprehensive mathematical model was tested based on experimental data from a smaller scale laboratory stand, and good agreement with the experimental results was observed. The effect of operating modes on physical and chemical processes and harmful emissions was analyzed, as well as the impact of oxygen concentration and CO2/H2O ratio on the combustion process.
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
(2023)
Article
Energy & Fuels
Mustafa Ilbas, Osman Kumuk, Serhat Karyeyen
Summary: The study investigated the impact of ammonia on gas turbine combustion performance, finding that ammonia-assisted kerosene fuels have potential in terms of combustion performance, but result in higher NOX emission levels.
Article
Thermodynamics
Gaofeng Fan, Meijing Chen, Chang 'an Wang, Qinqin Feng, Yunlei Sun, Jie Xu, Yongbo Du, Defu Che
Summary: This study numerically simulated the oxy-fuel combustion performance of a coking dry gas fired industrial furnace and proposed a modified model. The research findings demonstrate the significant impact of oxygen content, excess oxygen ratio, oxygen purity, and dehydration efficiency on combustion and heat transfer.
Article
Agricultural Engineering
Liping Tan, Lei Cai, Yanlei Xiang, Yanwen Guan, Wenbin Liu
Summary: This study establishes a biomass integrated gasification combined cycle with oxy-fuel combustion technology to achieve negative CO2 emissions in power plants. The effects of gas turbine pressure ratio and inlet temperature on the system performance are investigated. The results show that the system efficiency increases with the increase of CO2/C value, gas turbine pressure ratio, and inlet temperature. The results obtained in this study can provide theoretical support for the application of this technology.
BIOMASS & BIOENERGY
(2022)
Article
Energy & Fuels
Ming-Xin Xu, Hai-Bo Wu, Ya-Chang Wu, Han-Xiao Wang, Hao-Dong Ouyang, Qiang Lu
Summary: The process of flue gas compression and purification plays a crucial role in determining the quality of CO2 product in oxy-fuel combustion. A novel system integrating partial CO2 recirculation with flue gas purification was proposed and evaluated, achieving a purity of 99.9% CO2 stream. Enhancing condensing pressure to 3.0-4.0 MPa improved CO2 recovery performance, while critical ratios between recycled CO2 liquid and raw flue gas were identified for efficient contaminant abatement. The efficiencies of SO2 and NO removal exceeded 99%, with critical molar ratios and reactions pressures determining the success of abatement.
Article
Thermodynamics
Hyung Woo Kim, Su Been Seo, Seo Yeong Kang, Eun Sol Go, Seung Seok Oh, YongWoon Lee, Won Yang, See Hoon Lee
Summary: This paper focuses on the design and modeling of an indirect S-CO2 cycle in an oxy-fuel circulating fluidized bed power plant. By reducing the temperature of the recirculated flue gas and analyzing the effect of water retention in the flue gas on overall net efficiency, the plant achieved higher net efficiency.
Article
Thermodynamics
Filip Kokalj, Tomas Zadovec, Aleksandar M. Jovovi, Niko Samec
Summary: Wood biomass fuels have become increasingly important for achieving sustainability targets, but the emissions from these fuels need to be addressed. Air staging and flue gas recirculation are commonly used in large scale biomass fuel fired boilers, but their combined application in small scale commercial wood pellet boilers is not common. This study investigates the combustion parameters of a small-scale wood pellet boiler and provides useful guidelines for the design and optimization of the air and flue gas injection process parameters.
Article
Thermodynamics
Donghee Kim, Kang Y. Huh, Youngjae Lee
Summary: A numerical investigation of a 0.1 MWth POFC system revealed that increasing pressure results in lower temperature, higher average total heat recovery rate, increased radiative heat transfer, enhanced combustion reactions, and increased production of NO and NO2.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Environmental Sciences
Yi Xiang, Di Wu, Guohua Yang, Yanyan Chen, Wenhao Lyu
Summary: This study investigates the synergistic removal effect of different schemes based on demisters on boiler flue gas dust. The results show that when demisters are used alone, the dust removal efficiency ranges from 28.43% to 51.30%. The efficiency increases with higher inlet dust concentration, but it still falls short of the ultra-low emission standard of 10 mg/Nm³. When wet electro-static precipitator and demisters are used simultaneously, the dust removal efficiency reaches 93.13%, with an outlet dust concentration lower than 5 mg/Nm³. The research also suggests that the combination of water-washing layer and demisters can achieve a dust removal efficiency of 70.98%-78.37%, with an outlet dust concentration meeting the 10 mg/Nm³ standard when the liquid-gas ratio (L/G) is above 3.5.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Energy & Fuels
Zhipeng Yao, Jianquan Liu, Zhongzhu Qiu, Weiguo Pan, Zhenxin Wu
Summary: This study utilized CFD models to investigate a new solution for flue gas temperature deviation, optimizing parameters through orthogonal test method and determining the influence of different factors on temperature deviation. The optimal factor and level combination effectively reduced the flue gas temperature deviation.
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.