Performance evaluation of vanadium redox flow battery based on asymmetric flow rate design

Electrochimica Acta, Journal Year: 2025, Volume and Issue: unknown, P. 146046 - 146046

Published: March 1, 2025

Language: Английский

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Effects of novel nonlinear flow channels inspired by classical mathematical function on the output performance and low-grade heat recovery efficiency of thermally regenerative ammonia-based flow battery

Applied Energy, Journal Year: 2025, Volume and Issue: 391, P. 125917 - 125917

Published: April 14, 2025

Language: Английский

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Transient Voltage Information Entropy Difference Unit Protection Based on Fault Condition Attribute Fusion

Entropy, Journal Year: 2025, Volume and Issue: 27(1), P. 61 - 61

Published: Jan. 11, 2025

Transient protection has the advantage of ultra-high-speed action, but traditional transient is susceptible to influence two fault condition attributes, namely, transition resistance and initial angle fault, there are problems insufficient sensitivity reliability under weak faults. To this end, propagation characteristics high-frequency components voltage in bus line systems explored, a new method unit based on entropy difference information proposed. In order solve problem single-ended not being able reliably distinguish faults from adjacent first-end faults, between was introduced as characteristic. Aimed at susceptibility composite containing attribute were obtained by integrating with attributes overcome adverse improve protection. The algorithm solved 38.9% original cross-data, 36.1% false actions, 6.1% rejected actions. Finally, accuracy proposed verified extensive ATP-Draw simulation tests.

Language: Английский

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Enhancing output performance and thermoelectric conversion efficiency in thermal regeneration ammonia-based flow battery through a novel W-like flow channel

International Journal of Hydrogen Energy, Journal Year: 2025, Volume and Issue: 102, P. 1193 - 1209

Published: Jan. 15, 2025

Language: Английский

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Enhancing Mass Transport in Organic Redox Flow Batteries Through Electrode Obstacle Design

Batteries, Journal Year: 2025, Volume and Issue: 11(1), P. 29 - 29

Published: Jan. 16, 2025

This study examines the impact of incorporating obstacles in electrode structure an organic redox flow battery with a flow-through configuration. Two configurations were compared: A control case without (Case 1) and modified design to enhance mass transport uniformity 2). While Case 1 exhibited marginally higher discharge voltages (average difference 0.18%) due reduced hydraulic resistance lower Ohmic losses, 2 demonstrated significant improvements concentration uniformity, particularly at low state-of-charge (SOC) levels. The obstacle mitigated local depletion active species, thereby enhancing limiting current density improving minimum values across studied SOC range. However, introduction increased pressure drops, indicating trade-off between electrochemical performance pumping energy requirements. Notably, performed better rates, showcasing its potential optimize efficiency under varying operating conditions. At advantages diminished but remained evident, values, 1% average increase density. Future research should focus on optimizing geometry positioning further performance.

Language: Английский

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Line Direction Protection Based on Wavelet Energy Entropy Difference and SVM

Journal of Electrical Engineering and Technology, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 26, 2025

Language: Английский

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Study on the effect of mixed acid treatment on the microstructure and gas desorption kinetics of lignite

Physics of Fluids, Journal Year: 2025, Volume and Issue: 37(4)

Published: April 1, 2025

Research on physical and chemical structure, pore morphology, desorption characteristics of coal before after acidification is crucial for advancing coalbed methane development. Changes in mineral composition, gas behavior were systematically analyzed using techniques such as scanning electron microscopy (SEM), low temperature liquid nitrogen adsorption (LTNA), x-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR). SEM images reveal that treatments substantially alter the surface morphology lignite. The combined application hydrofluoric acid, hydrochloric acetic acid effectively removes inorganic minerals from while enhancing connectivity pores. LTNA experiments indicated specific area, volume, maximum capacity lignite significantly increased following mixed treatment. XRD FTIR analyses demonstrated treatment altered properties enhanced reactivity Gas measured acidification. three acids improved performance, initial velocity release amount increased, showed more obvious advantages stage desorption. A comprehensive quantitative index (φ) was established to relate microscopic parameters with parameters, allowing evaluation impact performance. φ value three-acid group 3.83, exceeding 1, which highlights superior effect

Language: Английский

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Bifunctional framework activated carbon graphite felt composite electrodes for high-performance vanadium redox flow battery

Journal of Power Sources, Journal Year: 2025, Volume and Issue: 642, P. 236987 - 236987

Published: April 9, 2025

Language: Английский

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Modeling and performance optimization of vanadium redox flow batteries

Journal of Energy Storage, Journal Year: 2025, Volume and Issue: 121, P. 116601 - 116601

Published: April 11, 2025

Language: Английский

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Identification and prevention of gas source in goaf: Stable carbon hydrogen isotope tracer method and numerical simulation of gas flow field

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(11)

Published: Nov. 1, 2024

Gas disaster in goaf (by goaf, we mean the area behind working face after coal mining) of mine has always been key research object safety. A large amount gas will flood into during mining work, and accurate identification its source is great significance for clarifying focus prevention optimizing control. In this paper, 28 118 Tunlan taken as object, distribution characteristics carbon hydrogen isotopes desorption each seam are revealed by field sampling experimental determination. The results show that main contribution form lower adjacent layer. COMSOL numerical simulation software was used to study law concentration under different extraction parameters large-diameter boreholes. optimal borehole spacing technology determined be 20 m, negative pressure 10 kPa, diameter 550 mm. On basis, comprehensive control with directional long proposed. Compared buried pipe extraction, proportion layer reduced 41.5% 40.2%, respectively, upper corner 46.77%. inhibits emission sources effectively reduces corner, which fundamentally prevents accumulation overrun face.

Language: Английский

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