Article
Chemistry, Physical
Zhenyong Yin, Hao Xu, Yanpeng Chen, Tiantian Zhao, Jingjie Wu
Summary: Research on hydrogen production from coal gasification focuses on the formation of CO and H2 from coal and water vapor. Pure oxygen-steam gasification is used to improve gasification efficiency. The two-step gasification process involving coal pyrolysis and char gasification is an efficient method for hydrogen production.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Engineering, Environmental
Jacek Grabowski, Krzysztof Korczak, Aleksandra Tokarz
Summary: The article presents the results of a coal gasification experiment conducted in the Wieczorek Mine, which lasted for 6 months underground and monitored the impact on underground and surface water. The study also included an analysis of water-tar condensates from the gas cleaning system.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2021)
Article
Energy & Fuels
Bing Xu, Mingkun Yang, Baolin Xing, Faqiang Su, Lunjian Chen, Fan Wang, Yulong Zhang, Guiyun Yi
Summary: Groundwater pollution caused by underground coal gasification (UCG) and its remediation have attracted significant public attention. Model gasification experiments were conducted on different coals with varying coalification degrees, showing higher phenol and Cr (VI) removal rates with UCG residual cokes compared to raw coals. The presence of oxygen-containing groups favored the removal of Cr(VI).
Article
Chemistry, Physical
Huan Liu, Shuqin Liu
Summary: This study compares energy consumption and greenhouse gas emissions between underground coal gasification (UCG)-based hydrogen production (UCG-H-2) and surface coal gasification (SCG)-based hydrogen production (SCG-H-2) using life cycle assessment. Results show UCG-H-2 has significant energy saving advantage, and 80% capture rate can achieve a balance between energy consumption and emissions. Scenario analysis suggests UCG substitution for hydrogen production can reduce energy consumption significantly.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Green & Sustainable Science & Technology
Renato Zagorscak, Richard Metcalfe, Laura Limer, Hywel Thomas, Ni An, Alex Bond, Sarah Watson
Summary: This paper presents a flexible risk assessment methodology for Underground Coal Gasification (UCG) technology, which evaluates potential risks by analyzing various scenarios. The application of a numerical model suggests that the risks of groundwater contamination from a UCG site should be very low if the site is developed and operated appropriately.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Thermodynamics
Huan Liu, Wei Guo, Shuqin Liu
Summary: This study compares the techno-economic performance of UCG-H2 and SCG-H2, and finds that UCG-H2 has lower investment and cost advantages, especially without CCS. However, the economic feasibility of UCG-H2 is challenged when hydrogen market prices are low.
Article
Green & Sustainable Science & Technology
Mingze Feng, Lin Xin, Zhigang Wang, Kaixuan Li, Jing Wu, Jiaze Li, Weimin Cheng, Bowei Wang
Summary: UCG technology, an innovative coal mining method, has not yet been widely applied due to complex geological conditions and control issues. The importance of gas tightness control in UCG and the challenges in maintaining it were discussed in this paper.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2021)
Article
Chemistry, Physical
Krzysztof Kapusta, Marian Wiatowski, Hywel R. Thomas, Renato Zagorscak, Sivachidambaram Sadasivam, Shakil Masum, Thomas Kempka, Christopher Otto, Wioleta Basa, Marcin Szyja, Krzysztof Stanczyk
Summary: This paper presents a series of surface experimental simulations of methane-oriented underground coal gasification using hydrogen as gasification medium. The experiments demonstrated that the physicochemical properties of coal considerably affect the hydrogasification process and the feasibility of methane-rich gas production was initially demonstrated. However, further techno-economic studies are necessary to assess the economic feasibility of methane production using this process.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Review
Engineering, Chemical
Fei Dai, Shengping Zhang, Yuanpei Luo, Ke Wang, Yanrong Liu, Xiaoyan Ji
Summary: Coal gasification is a core technology for clean coal utilization, enabling hydrogen-rich syngas production and reducing CO2 emissions. This review provides a brief overview of various coal gasification techniques, including conventional (fixed bed, fluidized bed, and entrained bed) and new (supercritical water, plasma, chemical-looping, and decoupling) gasification methods, discussing their gasifiers, process parameters, advantages, and challenges. Moreover, the potential of hydrogen production through different coal gasification technologies is analyzed. The decoupling gasification technology based on pyrolysis, coal char-CO2 gasification, and CO shift reaction is highlighted for its comprehensive coal utilization, low-energy CO2 capture and conversion, and efficient hydrogen production. This review also presents recent research advances in coal char-CO2 gasification, evaluating the influence of factors such as coal type, gasification agent composition, temperature, pressure, particle size, and catalyst on the gasification performance.
Review
Chemistry, Physical
Adnan Midilli, Haydar Kucuk, Muhammed Emin Topal, Ugur Akbulut, Ibrahim Dincer
Summary: This paper comparatively discusses various options for hydrogen production through coal gasification and highlights plasma gasification as a potential sustainable method. The case study analyzes the environmental sustainability of plasma gasifiers, showing higher hydrogen production, less solid waste release, and overall greater sustainability.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Energy & Fuels
Arif Hasanoglu, Ender Faki, Acelya Secer, Sefika Turker Uzden
Summary: This study investigated the effects of different solvents on gasification and hydrogen yield in coal/biomass co-solvent hydrothermal gasification. The results showed that NMP and THF were the most effective solvents, increasing product conversion and hydrogen yield. Comparing subcritical and supercritical water conditions, the study found that the solvent was more effective in catalytic processes.
Article
Energy & Fuels
Lele Feng, Maifan Dong, Binhao Wang, Botao Qin
Summary: Underground coal gasification (UCG) is optimized using the controlled retreating injection point (CRIP) method, but previous studies only focused on gasification behavior under fixed time intervals. This study examines gas production and reaction region evolution for UCG with continuously moving injection in different directions and speeds. Moving backward injection at a uniform speed results in unsatisfactory gas production, while backward injection at regular intervals with fixed distances optimizes gas production. Moving forward injection with matched speed and oxygen flow achieves stable gas production with high heating value. Different methods are recommended for different types of coal to overcome specific challenges.
Article
Energy & Fuels
Liangliang Jiang, Shanshan Chen, Yanpeng Chen, Zhangxin Chen, Fenjin Sun, Xiaohu Dong, Keliu Wu
Summary: Underground coal gasification (UCG) has the prospect of tapping deep coal seams and reducing carbon emissions. However, there is limited experience in deep UCG development. This study constructed a large-scale 3D UCG model with an improved method and considered the effect of double-diffusive natural convection. The results showed that the improved method was beneficial for the development of UCG cavities in deep coal seams, and double-diffusive natural convection played an important role in cavity development and overall UCG performance.
Article
Chemistry, Applied
Chuanjin Lin, Peitao Zhao, Yan Ding, Xin Cui, Fang Liu, Cuiping Wang, Qingjie Guo
Summary: This study aimed to produce hydrogen-rich syngas through steam gasification of hydrochars obtained from co-hydrothermal carbonization of polyvinyl chloride and alkali coal. The co-hydrothermal carbonization process facilitated the removal of hydrophilic groups in the hydrochars, resulting in increased H-2 and CH4 yields. Additionally, the presence of alkali and alkaline earth metals (AAEMs) was found to weaken the catalytic effect on H-2 production, which could be remedied by the addition of PVC.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Thermodynamics
Lin Xin, Mingyu An, Mingze Feng, Kaixuan Li, Weimin Cheng, Weitao Liu, Xiangming Hu, Zhigang Wang, Limin Han
Summary: This study simulated the pyrolysis process of lump coal in UCG tunnel, showing that with the increase of final pyrolysis temperature, the functional group content of coal samples decreased and the structure became more disordered.
Article
Environmental Sciences
Sivachidambaram Sadasivam, Renato Zagorscak, Hywel Rhys Thomas, Krzysztof Kapusta, Krzysztof Stanczyk
Summary: This paper investigates the inorganic constituents generated during underground coal gasification (UCG) under different operating conditions. It was found that increasing the water content in the oxidants decreased cationic elements but increased anionic species concentrations. Temperature had a minor impact on the experiments, while high-pressure experiments at the optimal temperature showed significant reduction in cationic element generation. Both coal specimens produced high amounts of anionic species, with the hard bituminous coal from Poland showing higher reactivity. The inorganic composition in the solid residue was used to predict dissolved product concentrations when interacting with deep coal seam water during UCG cavity flooding. Additionally, changes in groundwater geochemistry were observed, indicating the need for further study on their transportation in the subsurface.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Energy & Fuels
Aleksandra Strugala-Wilczek, Krzysztof Kapusta
Summary: In this study, a numerical model of inorganic pollutant migration in the area of an underground coal gasification (UCG) reactor was constructed. The study compared the effect of different sorption affinities on the deceleration and shape of the contaminant plume in geological formations. The results showed that sorption parameters, time, and distance play important roles in pollutant migration.
Article
Agricultural Engineering
Oraleou Sangue Djandja, Fan-Gong Kong, Lin-Xin Yin, Pei-Gao Duan, Donghai Xu, Krzysztof Kapusta
Summary: Two types of aqueous phases prepared from hydrothermal carbonization of sewage sludge were cocarbonized with cellulose at different temperatures. The N content of the hydrochars was promoted by the N-heterocyclic compounds in the aqueous phase, while the O content was reduced. Increasing the temperature improved the incorporation of N into the aromatic rings. The derived N-doped carbons exhibited different properties depending on the O/N ratio. NC230280 showed the best performance in terms of specific capacitance, internal resistance, and time constant. The type of precursor and the elemental composition influenced the capacitance performance.
BIOMASS & BIOENERGY
(2022)
Article
Chemistry, Analytical
Botian Hao, Wanpeng Yang, Yu Wang, Donghai Xu, Krzysztof Kapusta, Yang Guo
Summary: This study investigated the coupling effects of reaction temperature and residence time on nitrogen transformation during hydrothermal liquefaction of municipal sludge. The optimal conditions were determined and the distribution and transformation pathways of nitrogen were clarified.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2022)
Article
Energy & Fuels
Aleksandra Strugala-Wilczek, Krzysztof Kapusta, Magdalena Pankiewicz-Sperka
Summary: One of the most significant environmental risks associated with underground coal gasification (UCG) is groundwater contamination. This study investigates the characteristics of UCG solid residues and their potential to release pollutants to the surrounding area. Laboratory tests were conducted on the residues produced during ex situ UCG of two types of lignites. The results show that the samples from different parts of the reactor differ significantly and may release contaminants. However, no dangerous trace elements were found in the aqueous extracts, suggesting that UCG of lignite is safe for the aquatic environment during the post-operational phase.
Article
Chemistry, Physical
Krzysztof Kapusta, Marian Wiatowski, Hywel R. Thomas, Renato Zagorscak, Sivachidambaram Sadasivam, Shakil Masum, Thomas Kempka, Christopher Otto, Wioleta Basa, Marcin Szyja, Krzysztof Stanczyk
Summary: This paper presents a series of surface experimental simulations of methane-oriented underground coal gasification using hydrogen as gasification medium. The experiments demonstrated that the physicochemical properties of coal considerably affect the hydrogasification process and the feasibility of methane-rich gas production was initially demonstrated. However, further techno-economic studies are necessary to assess the economic feasibility of methane production using this process.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Energy & Fuels
Jacek Nowak, Magdalena Kokowska-Pawlowska, Joanna Komorek, Marian Wiatowski, Krzysztof Kapusta, Zdzislaw Adamczyk
Summary: This study conducted coal gasification experiments under different pressures to analyze the changes in optical properties of the organic matter and determine the temperature influence on coal. The results showed that the reflectance and bireflectance of coal decreased with increasing distance from the reactor chamber inlet, and the temperature influence on coal decreased as well. Additionally, the actual temperatures during the experiment were higher than recorded temperatures, and the distance at which temperature had a significant impact depended on the pressure used.
Article
Energy & Fuels
Botian Hao, Donghai Xu, Yu Wang, Yuanyuan Wang, Krzysztof Kapusta, Yang Guo
Summary: This study evaluated the effects of non-noble metal catalysts supported on activated carbon on the hydrothermal liquefaction (HTL) process of municipal sludge with ethanol solvent. The results showed that Ni-Co/AC and Ni-Cu/AC catalysts increased the energy value of biocrudes and reduced the sulfur content. Ethanol solvent significantly improved biocrude yields and promoted the conversion of high boiling point compounds to low boiling point compounds.
Article
Agricultural Engineering
Elendu Collins Chimezie, Zhicong Wang, Yun Yu, Ude Callistus Nonso, Pei-Gao Duan, Krzysztof Kapusta
Summary: This work utilized a solvent extraction technique to obtain oil from avocado pear seeds and peels, and used methanol and H2SO4 to pre-treat the extracted oil. Biodiesel production was optimized through trans-esterification between the pre-treated oil and methanol catalyzed by NaOH, yielding a 91 wt% biodiesel at specific conditions. Engine tests showed that the engine used less than 20% biodiesel mixture to generate the same amount of work compared to fossil diesel, with the 20% biodiesel mixture exhibiting the best engine performance.
INDUSTRIAL CROPS AND PRODUCTS
(2023)
Article
Energy & Fuels
Marian Wiatowski
Summary: The yield and composition of the tar collected during a three-day gasification test of a large coal block with oxygen in atmospheric pressure conditions were investigated. Sand was used as an insulating material and the tar was sampled every 7 hours. The results showed that the composition and amount of the obtained process gas and tar were significantly affected by the reaction between the water in the wet sand and the gasified coal. The total yield of the tar from this underground coal gasification (UCG) process was 1.8%, which was three times lower than the efficiency of the classic coking process.
Article
Energy & Fuels
Marian Wiatowski, Krzysztof Kapusta, Aleksandra Strugala-Wilczek, Krzysztof Stanczyk, Alberto Castro-Muniz, Fabian Suarez-Garcia, Juan Ignacio Paredes
Summary: This paper presents surface experiments investigating the influence of gasification medium and coal rank on the underground coal gasification process. The experiments show that using oxygen as the gasifying agent results in higher gas quality and process efficiency compared to using oxygen-enriched air. The coal rank also affects the gas quality and energy efficiency of the process. The rate of water condensate production is also influenced by the gasifying agent.
Article
Environmental Sciences
Longfei Xie, Le Gou, Donghai Xu, Krzysztof Kapusta, Liyi Dai, Yuanyuan Wang
Summary: This study investigates the influence of model compounds on nitrogen transformation during the hydrothermal carbonization (HTC) of sewage sludge (SS). It is found that the organic components can reduce nitrogen content and increase the aromaticity of the hydrochar, with humus showing the best performance. Hemicellulose and cellulose have the strongest effects on nitrogen retention, while lignin and humus promote nitrogen transformation. Although protein decreases energy recovery and yield, it favors the carbonization process. This research provides references for estimating nitrogen content and quality of hydrochar, and for future research on hydrochar upgrading.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Energy & Fuels
Oraleou Sangue Djandja, Linxin Yin, Zhicong Wang, Pei-Gao Duan, Donghai Xu, Krzysztof Kapusta
Summary: This study investigated the influence of reaction solvent (water/ethanol) and nitrogen source (pyridine/pyrrole) on the synthesis of N-doped carbon material through a hydrothermal process. The presence of water promoted cellulose carbonization and nitrogen doping through a Maillard reaction with pyridine. Increasing temperature and the water/pyridine ratio enhanced cellulose carbonization and the Maillard reaction. The obtained N-doped carbon materials exhibited high specific surface area and specific capacitance, and good capacitance retention after cycles.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Energy & Fuels
Nuno Batalha, Ruben Checa, Chantal Lorentz, Pavel Afanasiev, Krzysztof Stanczyk, Krzysztof Kapusta, Dorothee Laurenti, Christophe Geantet
Summary: This study explores the relationship between hydrothermal liquefaction (HTL) crude oil composition and hydrotreatment (HDT) conversion. It was found that the composition differences of different crude oils determine the potential for producing hydrocarbon fuels, with HTL crude oils rich in aromatic compounds being more favorable for producing naphthenes and aromatic hydrocarbons, while crude oils richer in aliphatic carbon tend to yield paraffins. Additionally, the nature and concentration of heteroatom components also need to be considered.
Article
Green & Sustainable Science & Technology
Mingyan Ma, Donghai Xu, Xuehan Gong, Yunfei Diao, Peng Feng, Krzysztof Kapusta
Summary: Biochar derived from municipal sewage sludge (MSS) pyrolysis can be used as a catalyst to achieve product recycling and enhance conversion rate. The kinetics of MSS product recirculation catalytic pyrolysis were investigated through non-isothermal thermogravimetric experiments. The results revealed that MSS noncatalytic/catalytic pyrolysis reaction involves five stages, with the main decomposition occurring between 180 and 680 degrees C and accounting for a significant mass loss.
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.