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Experimental Study on energy Storage Characteristics of Sintered Ore Particle Packed Beds

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Journal of Thermal Science 2025年第1期34卷 242-253页

作者： LAI Zhenya DING Liwei LYU Hongkun HOU Chenglong CHEN Jiaying GUOXutao HAN Gaoyan ZHANG Kang State Grid Zhejiang Electric power Research Institute Hangzhou 310014China State Key Laboratory of Clean energy Utilization Zhejiang UniversityHangzhou 310027China

The particle packed bed energy storage system has advantages such as low costs and wide temperature ranges,which can be combined with solar thermal power generation systems to solve the inherent volatility and discontinuity of renewable *** new materials with low costs and excellent storage performances is one of the eternal research hotspots in the field of energy *** paper innovatively uses sintered ore particles as energy storage material and studies the effect of particle size on the airflow resistance characteristics,energy storage characteristics,and thermocline evolution characteristics of the packed bed through thermal energy storage *** results indicate that for the particles in the macro scale,the smaller the particle,the lower the absolute permeability of the bed and the greater the airflow *** packed bed with smaller particles has a larger specific surface area,larger bulk mass,and smaller bed ***,the packed beds with smaller particles have better thermocline characteristics,less irreversible loss,and can achieve higher thermal efficiency and higher exergy efficiency in the heat storage *** cycle thermal efficiency in packed beds with 25-40 mm,16-25 mm,and 10-16 mm particles is 53.58%,56.27%,and 57.60%,respectively,and the cycle exergy efficiency is 61.81%,69.25%,and 74.13%,***,this paper also studies the effect of discharging airflow rates on thermal storage *** experimental results indicate that suitable discharging strategies should be selected based on different heat demands.

关键词： particle packed bed airflow resistance thermal energy storage thermocline evolution

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Synergistic enhancement of ion/electron transport by ultrafine nanoparticles and graphene in Li2FeTiO4/C/G nanofibers for symmetric Li-ion batteries

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Journal of energy Chemistry 2025年第02期101卷 42-51页

作者： Wenjie Ma Yakun Tang Yue Zhang Xiaohui Li Lang Liu Xueting Wang Yuliang Cao State Key Laboratory of Chemistry and Utilization of Carbon Based energy Resources Key Laboratory of Energy Materials Chemistry Ministry of Education College of Chemistry Xinjiang University College of Chemistry and Molecular Sciences Hubei Key Laboratory of Electrochemical Power Sources Wuhan University

Low-cost Fe-based disordered rock salt（DRX） Li2FeTiO4is capable of providing high capacity(295 mA h g-1) by redox activity of cations(Fe2+/Fe4+and Ti3+/Ti4+) and anionic ***,DRX structures lack transport channels for ions and electrons,resulting in sluggish kinetics,poor electrochemical activity,and ***,graphene conductive carbon network permeated Li2FeTiO4（LFT/C/G） nanofibers are successfully prepared by a facile sol-gel assisted electrospinning *** Li2FeTiO4nanoparticles（2 nm） and one-dimensional（1D） structure provide abu ndant active sites and unobstructed diffu sion channels,accelerating ion *** addition,introducing graphene reduces the band gap and Li+diffusion barrier and improves the dynamic properties of Li2FeTiO4,thus achieving a relatively mild interfacial reaction and reversible redox *** expected,the LFT/C/1.0G cathode delivers a remarkable discharge capacity(238.5 mA h g-1),high energy density(508.8 Wh kg-1),and excellent rate capability(51.2 mA hg-1at 1.0 A g-1).Besides,the LFT/C/1.0G anode also displays a high capacity(514.5 mA h g-1at 500 mA g-1) and a remarkable rate capability(243.9 mA h g-1at 8 A g-1).Moreover,the full batteries based on the LFT/C/1.0G symmetric electrode demonstrate a reversible capacity of 117.0 mA h g-1after 100 cycles at 50 mA *** study presents useful insights into developing cost-effective DRX cathodes with durable and fast lithium storage.

关键词： 1D structure Disordered rock salt Li2FeTiO4 Graphene Lithium-ion battery electrode Rapid ion/electron transport

MOF-derived Ni3Fe/Ni/NiFe2O4@C for enhanced hydrogen storage performance of MgH2

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Journal of energy Chemistry 2025年第2期101卷 333-344页

作者： Yangping Chen Bolin Sun Guoqing Zhang Siyuan Ni Canbing Li Juxiong Tian Yanrui Zhang Xinxi Li School of Materials and energy Guangdong University of Technology Shen Zhen Source Sensor Technology CO. Ltd Department of Electrical Engineering Shanghai Jiao Tong University China power Investment Xinjiang energy & Chemical Group Hotan Co.Ltd

Magnesium hydride（MgH2） is an important material for hydrogen（H2） storage and transportation owing to its high capacity and ***,its intrinsic properties have considerably limited its industrial *** this study,the NiFe-800 catalyst as metal-organic framework（MOF） derivative was first utilized to promote the intrinsic properties of *** to pure MgH2,which releases1.24 wt% H2in 60 min at 275℃,the MgH2-10 NiFe-800 composite releases 5.85 wt% H2in the same *** at a lower temperature of 250℃,the MgH2-10 NiFe-800 composite releases 3.57 wt% H2,surpassing the performance of pure MgH2at 275℃.Correspondingly,while pure MgH2absorbs 2.08 wt% H2in60 min at 125℃,the MgH2-10 NiFe-800 composite absorbs 5.35 wt% H2in just 1 min,Remarkably,the MgH2-10 NiFe-800 composite absorbs 2.27 wt% H2in 60 min at 50℃ and 4.64 wt% H2at 75℃.This indicates that MgH2-10 NiFe-800 exhibits optimum performance with excellent kinetics at low ***,the capacity of the MgH2-10 NiFe-800 composite remains largely stable after ***,the Mg2Ni/Mg2NiH4acts as a "hydrogen pump",providing effective diffusion channels that enhance the kinetic process of the composite during ***,Fe0facilitates electron transfer and creates hydrogen diffusion channels and catalytic ***,carbon（C） effectively prevents particle agglomeration and maintains the cyclic stability of the ***,the synergistic effects of Mg2Ni/Mg2NiH4,Fe0,and C considerably improve the kinetic properties and cycling stability of *** work offers an effective and valuable approach to improving the hydrogen storage efficiency in the commercial application of MgH2.

关键词： Catalysts Hydrogen energy MgH2 MOF derivative Solid state storage

Analysis of Compressor Cascade Deviation and Surrogate Model Construction Based on Retained Lift

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Journal of Thermal Science 2025年第02期 567-578页

作者： HU Haojie JIN Donghai Aeroengine Simulation Research Center School of Energy and Power EngineeringBeihang University

The through-flow method still plays an important role in the design of modern aero-engine,and its accuracy depends on the loss and deviation *** presence of tip clearance will impact the deviation distribution,while the retained lift is somewhat related to this *** achieve a more precise deviation model,this paper utilises the machine learning *** database comprises cascades with tip clearances in training,from which obtains a span-wise deviation model and executes its validation by comparing with experiment *** database is obtained by calculating 16 different geometries of the cascades with tip clearance in different working conditions,introducing the geometrical parameters of the cascades and retained lift as feature *** deviation and the retained lift follow the same trend with tip clearance size and operating conditions *** predict the span-wise distribution of the retained lift using the k-nearest neighbour regression,and then combine with the traditional model to get the distribution of the *** results show that the coefficient of determination of the retained lift coefficient prediction in the test set reaches 81.02%,and the mean absolute error is around 1.32%.Moreover,the trend predictions of cascade deviation distribution for different tip clearance size are all in good agreement with the experimental *** coefficient of determination of the prediction with the simulation is 75.23%,and the mean absolute error is 1.74%.

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Impact of Startup Strategy and Buffer Tank Volume on the Compressor Inlet State for a 3-MW sCO_(2)Brayton Cycle

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Journal of Thermal Science 2025年第1期34卷 159-175页

作者： ZHAO Decai WANG Bo Key Laboratory of Advanced energy and power Institute of Engineering Thermophysics(IET)Chinese Academy of Sciences(CAS)Beijing 100190China University of Chinese Academy of Sciences Beijing 100049China

The supercritical carbon dioxide(sCO_(2))Brayton cycle system has become an emerging and highly promising method of thermal power conversion due to its efficiency advantage,system compactness,and excellent adaptability of the heat *** the low carbon sCO_(2)Brayton cycle testbed with cycle output power approaching 3 MW,a relatively detailed dynamic simulation model of the entire system is constructed to explore the dynamic response characteristics of the system with different startup strategies and different buffer tank volumes during the startup *** simulation results indicate that the smaller the volume of the buffer tank,the more rapid and obvious the parameter fluctuation in the buffer tank during the *** the allowable relative deviation limit of density is 5%,then the ratio of the buffer tank volume to the volume of the entire closed loop should not be lower than 36.80%.The strategy of simultaneous temperature and speed increase during turbine bypass start can effectively reduce the fluctuation of compressor inlet parameters and reach the steady-state more *** paper provides the recommended matching table for the opening of the turbine bypass valve(TBV)and the main regulating valve(MGV)to reduce the parameter fluctuation during the bypass *** effectiveness of the proposed turbine bypass and bypass switching startup strategy is verified by simulation,which may be used as a reference for test bench's future debugging and operation.

关键词： sCO_(2)Brayton cycle dynamic model buffer tank startup strategy dynamic characteristic

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Experimental verification of a PIV-based pressure field reconstruction technology in supersonic flows

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Science China Technological Sciences 2025年第3期68卷 243-261页

作者： Jie TIAN Jinglei XU Shun LIU Le CAI College of energy and power Engineering Nanjing University of Aeronautics and Astronautics State Key Laboratory of Mechanics and Control of Aeronautics and Astronautics Structures Nanjing University of Aeronautics and Astronautics School of energy and power Engineering Jiangsu University

This study proposes a novel approach that involves applying the flux vector splitting(FVS) technique to discretize and approximate conservative Navier-Stokes equations and thus reconstruct pressure fields from planar velocimetry data in compressible flows, especially for supersonic flows with strong shocks. Data are typically resolved by using the particle image velocimetry(PIV) technique. Two supersonic experiments under Mach 2.9–3.0 conditions were conducted to generate strong shocks and investigate the performance of the FVS method, including oblique shock flow and shock wave/boundary layer interaction(SWBLI) coupled with flow separation. Reconstructed pressure fields were comprehensively evaluated. The shock polar results indicated that FVS method possessed higher accuracy in post-shock regions with a pressure ratio error of less than2%, especially for the areas downstream of the shock-shock intersection point and the shock-boundary intersection point, where the conventional Poisson method was ineffective and larger errors accumulated. Wall pressure in SWBLI flow also had better agreement. Furthermore, the performances of different methods were discussed from the perspective of the physical characteristics in supersonic flows, which explained the superiority of the FVS method because the pressure information was delivered along the characteristic direction of physical waves.

关键词： particle image velocimetry supersonic flow pressure reconstruction flux vector splitting technique

Improved Discontinuous SVM Based Fault-Tolerant Control of AC/DC Converter for All-DC Offshore Wind power System

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CSEE Journal of power and energy Systems 2025年第1期11卷 184-195页

作者： Wei Qin Yingning Qiu Yanhui Feng School of energy and power Engineering of Nanjing University of Science and Technology Nanjing210094China

An improved discontinuous space vector modulation(IDSVM)approach is proposed through analysis of key factors to impact fault tolerance control performance for the AC/DC converter in an all-DC offshore wind power *** three main factors being studied are compensation ratios of active vectors,type of vectors used to resynthesize reference voltage vector and zero vectors distribution in time *** effects are discussed from perspective of energy input,transmission and loss in the AC/DC *** schemes using different compensation ratios for active vectors are compared,and scheme C using projections on current axis achieves better fault tolerance *** this paper,the distorted voltage vector is used to synthesize reference voltage vector and the healthy zero vector is redistributed in the twelve *** former is beneficial to reduce three-phase current spikes and the latter helps to stabilize DC-link *** of the improved modulation approach are verified on an experimental platform simulating the offshore wind turbine with single switch and multiple switch open-circuit *** robustness and high performance are thoroughly evaluated.

关键词： AC/DC converter All-DC offshore wind power system compensation ratios discontinuous SvM distorted voltage vector fault-tolerance control open-circuit faults

A seaweed-inspired separator for high performance Zn metal batteries:Boosting kinetics and confining side-reactions

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Journal of energy Chemistry 2025年第2期101卷 191-200页

作者： Qianzhi Gou Horan Luo Long Qu Feilin Yu Kaixin Wang Sida Zhang Ziga Luogu Ben Zhang Yujie Zheng Bingye Song John Wang Meng Li National Innovation Center for Industry-Education Integration of energy Storage MOE Key Laboratory of Low-grade Energy Utilization Technologies and SystemsCQU-NUS Renewable Energy Materials & Devices Joint Laboratory College of Energy & Power Engineering Chongqing University School of Building Services Science and Engineering Xi'an University of Architecture and Technology School of Chemistry and Chemical Engineering Chongqing University of Science and Technology Southwest Technology and Engineering Research Institute National University of Singapore (Chongqing) Research Institute

Uncontrolled dendrite growth,sluggish reaction kinetics,and drastic side reactions on the anodeelectrolyte interface are the main obstacles that restrict the application prospect of aqueous zinc-ion *** glass fiber（GF） separator with chemical inertness is almost ineffective in restricting these ***,inspired by the ionic enrichment behavior of seaweed plants,a facile biomass species,anionic sodium alginate（SA）,is purposely decorated on the commercial GF separator to tackle these issues towards Zn *** from the abundant zincophilic functional groups and superior mechanical strength properties,the as-obtained SA@GF separator could act as ion pump to boost the Zn2+transference number（0.68）,reduce the de-solvation energy barrier of hydrated Zn2+,and eliminate the undesired concentration polarization effect,which are verified by experimental tests,theoretical calculations,and finite element simulation,*** on these efficient modulation mechanisms,the SA@GF separator can synchronously achieve well-aligned Zn deposition and the suppression of parasitic ***,the Zn‖Zn coin cell integrated with SA@GF separator could yield a prolonged calendar lifespan over 1230 h(1 mA cm-2and 1 mAh cm-2),exhibiting favorable competitiveness with previously reported separator modification ***,the Zn-MnO2full and pouch cell assembled with the SA@GF separator also delivered superior cycling stability and rate performance,further verifying its practical application *** work provides a new design philosophy to stabilize the Zn anode from the aspect of separator.

关键词： Aqueous zinc-ion batteries Dendrite-free Interfacial reaction kinetics Separator modification Sodium alginate

Silk damping in scalar-induced gravitational waves:a novel probe for new physics

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Science China(Physics,Mechanics & Astronomy) 2025年第1期68卷 75-81页

作者： Yan-Heng Yu Sai Wang Theoretical Physics division Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China School of Physics University of Chinese Academy of SciencesBeijing 100049China

Silk damping is well known in the study of cosmic microwave background(CMB)and accounts for suppression of the angular power spectrum of CMB on large angular *** this article,we study the effect of Silk damping on the scalar-induced gravitational waves(SIGWs).Resulting from the dissipation of cosmic fluid,the Silk damping notably suppresses the energy-density spectrum of SIGWs on scales comparable to a diffusion scale at the decoupling time of weakly-interacting *** effect offers a novel observable for probing the underlying particle interaction,especially for those mediated by heavy gauge bosons beyond the standard model of *** anticipate that pulsar timing arrays are sensitive to gauge bosons with mass∼10^(3)-10^(4)GeV,while space-and ground-based interferometers to those with mass∼10^(7)-10^(12)GeV,leading to essential comple-ments to on-going and future experiments of high-energy physics.

关键词： scalar-induced gravitational waves Silk damping new physics

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