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Recycling and utilization of coal gasification residues for fabricating Fe/C composites as novel microwave absorbents

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International Journal of Minerals,Metallurgy and Materials 2023年第3期30卷 591-599页

作者： Guomin Li Xiaojie Xue Lutao Mao Yake Wang Lingxiao Li Guizhen Wang Kewei Zhang Rong Zhang Yuexiang Wang Liping Liang School of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China Key Laboratory of Advanced Materials of Tropical Island Resources of Ministry of Education Hainan UniversityHaikou 570228China State Key Laboratory for Coal Conversion Institute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001China China-Belarus Belt and Road Joint Laboratory on Electromagnetic Environment Effect Taiyuan 030032China

Under the background of a transformation of the global energy structure,coal gasification technology has a wide application prospect,but its by-product,the coal gasification residue(CGR),is still not being efficiently utilized for *** CGR contains abundant carbon components,which could be applied to the microwave absorption field as the carbon *** this study,Fe/CGR composites are fabricated via a two-step method,including the impregnation of Fe^(3+)and the reduction *** influence of the different loading capacities of the Fe component on the morphology and electromagnetic properties is ***,the loading content of Fe and the surface morphology of the Fe/CGR can be reasonably controlled by adjusting the concentration of the ferric nitrate ***,Fe particles are evenly inserted on the CGR framework,which expands the Fe/CGR interfaces to enhance interfacial polarization,thus further improving the microwave-absorbing(MA)properties of ***,as the Fe^(3+)concentration is 1.0 mol/L,the Fe/CGR composite exhibits outstanding *** reflection loss reaches-39.3 dB at 2.5 mm,and the absorption bandwidth covers 4.1 GHz at 1.5 *** this study,facile processability,resource recycling,appropriately matched impedance,and excellent MA performance are ***,the Fe/CGR composites not only enhance the recycling of the CGR but also pioneer a new path for the synthesis of excellent absorbents.

关键词： coal gasification residue recycling utilization composite microwave absorption

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Milestones, hotspots and trends in the development of electric machines

iEnergy

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iEnergy 2022年第1期1卷 82-99页

作者： Ronghai Qu You Zhou Dawei Li State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and Technology430074 WuhanChina School of Electrical and Electronic Engineering Nanyang Technological Uni-versity639798Singapore

As one of the greatest inventions of human beings,the electric machine(EM)has realized the mutual conversion between electrical energy and mechanical energy,which has essentially led humanity into the age of electrification and greatly promoted the progress and development of human *** paper will briefly review the development of EMs in the past two centuries,highlighting the historical milestones and investigating the driving force behind *** the innovation of theory,the progress of materials and the breakthrough of computer science and power electronic devices,the mainstream EM types has been continuously changing since its *** paper will not only summarize the basic operation principle and performance characteristics of traditional EMs,but also that of the emerging types of ***,control and drive system,as a nonnegligible part of EM system,will be complementarily ***,due to the background of global emission reduction,industrial intelligentization and transportation electrification,EM industry will usher again in a golden period of ***,several foreseeable future developing trends will be analyzed and summarized.

关键词： Electric machine(EM) historical review industrial applications research hotspot technology development topology

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Prediction of Equivalent Icing Thickness of Transmission Lines in Distribution Network

Prediction of Equivalent Icing Thickness of Transmission Lin...

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Power and Electrical engineering (ACPEE), 5th Asia Conference on

作者： Jiaxin Xu Dayi Li Yufeng Dai Siqi Xie State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Country Wuhan China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9798350309638

ISBN: (纸本)9798350309645

Aiming at the problem that the time series forecasting method will produce a certain degree of lag due to its series autocorrelation, the multivariate equivalent ice thickness prediction using meteorological data as the feature is used. Aiming at the problem that the prediction accuracy of ice thickness is not high, the attention mechanism is used to assign adaptive weights to multi-dimensional feature parameters and time steps to highlight important information in different feature dimensions and time steps. At the same time, due to the change of ice cover with time, a Bi-directional Long Short-term Memory (Bi-LSTM) is used to establish an ice cover prediction model to make use of the past and future information provided at each time point in the process, and for the parameter selection problem of Bi-LSTM, the sparrow search algorithm (SSA) is used to select the hyperparameters to reduce the error caused by human intervention, and then improve the accuracy of line equivalent ice thickness prediction, and finally verify the validity of the model through experimental results.

关键词： Analytical models Ice thickness Time series analysis Poles and towers Weather forecasting Predictive models Prediction algorithms

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Guided Ionization Discharge Characteristics of N2 and O2 Driven by Pulsed DC Power 4th

Guided Ionization Discharge Characteristics of N2 and O2 Dri...

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4th International Symposium on Plasma and Energy Convention, ISPEC 2022

作者： Liu, Jianben Zhang, Jiangong Nie, Lanlan Li, Ni Zhang, Ruizhi State Key Laboratory of Power Grid Environmental Protection China Electric Power Research Institute Hubei Wuhan China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Hubei Wuhan430074 China

ISBN: (纸本)9789819915750

In recent years, the non-equilibrium plasma show great application in material processing. The nitrogen and oxygen gas driven by Pulsed DC power at lower pressure in a long dielectric tube have been investigated. With fixed voltage parameter, the stable and homogeneous plasma propagates along the tube at pressure ranging from 20 Pa to 1 × 104Pa like the guided ionization wave. The length of the plasma plume has the maximum value about 100 cm at 100–200 Pa. With the voltage amplitude increasing, the length of N2 plasma plume and O2 plasma plume increase. With the frequency is lower than 8 kHz, the length of N2 plasma plume is larger than that of oxygen, and after that, the length of O2 become larger. When the pulse width is higher than 10 μs, the length of O2 reduced sharply. N2 and O2 plasma plume contains bright "bullet" from the high spatio-temporal resolution photographs. However, the N2 "bullet" has a long tail differing from O2 at the same E/N. The gas temperature simulated by the second positive system of N2(C3Πu-B3Πg) is 330 K for N2 plasma at 100 Pa and 1 × 103Pa, while it is 320 K and 330 K for O2 which is suitable for the plasma medicine and other material application. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Nitrogen

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Chlorine-rich lithium argyrodites enables superior performances for solid-state Li-Se batteries at wide temperature range

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Rare Metals 2022年第12期41卷 4065-4074页

作者： Jin-Yan Lin Shuai Chen Jia-Yang Li Dian Yu Xiang-Ling Xu Chuang Yu Shao-Qing Chen Xue-Fei Miao Lin-Feng Peng Chao-Chao Wei Chong-Xuan Liu Shi-Jie Cheng Jia Xie State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China School of Materials Huazhong University of Science and TechnologyWuhan 430074China Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen 518055China Key Laboratory of Advanced Metallic and Intermetallic Materials Technology School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China School of Environmental Science and Engineering Southern University of Science and TechnologyShenzhen 518055China

All-solid-state Li-Se battery shows great potential as a candidate for next-generation energy storage devices due to its high energy density and ***,the low ionic conductivity of the solid electrolytes and large volume changes of Se active materials are two of the major issues that limit its ***,a simple solid-state reaction method is applied to synthesize chlorine-rich argyrodite Li_(5.5)PS_(4.5)CI_(1.5)electrolyte with high conductivity of 6.25 mS·cm^(-1)at room *** nanotube(CNT)is introduced as the host for Se to obtain Se/CNT composite with both enhanced electronic conductivity and lower volume expansion during the electrochemical reaction ***-solid-state Li-Se battery using Li_(5.5)PS_(4.5)CI_(1.5)as solid electrolyte combined with Se/CNT cathode and Li-In anode shows a discharge capacity of 866 mAh·g-1for the 2nd cycle under0.433 mA·cm-2at room ***,the assembled battery delivers a high discharge capacity of1026 mAh·g^(-1)for the 2nd cycle when cycled at the same current density at 60℃and maintains a discharge capacity of 380 mAh·g^(-1)after 150 *** to the high Li-ion conductivity of Li_(5.5)PS_(4.5)CI_(1.5)electrolyte,the assembled battery displays a high discharge capacity of 344 mAh·g^(-1)under 0.113 mA·cm^(-2)at-20℃C and remains 66.1%after200 *** addition,this all-solid-state Li-Se battery shows ultralong cycling performances up to 1000 cycles under 0.433 mA·cm^(-2)at-20℃.This work offers the design clue to fabricate the all-solid-state Li-Se battery workable at different operating temperatures with an ultralong cycling life.

关键词： Lithium argyrodite Chlorine-rich All-solidstate Li-Se batteries Operating temperatures Long cycling performances

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Post-Disaster Scheduling Strategy of Island Microgrid with Electric Passenger Ships 4

Post-Disaster Scheduling Strategy of Island Microgrid with E...

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4th International Conference on Power and Energy technology, ICPET 2022

作者： Wu, Chuantao Ma, Yuncong Chen, Cen Sun, Chengcheng Lin, Xiangning Wei, Fanrong Li, Zhengtian Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Hubei Wuhan430074 China

ISBN: (数字)9781665480796

ISBN: (纸本)9781665480796

Island microgrids (IMGs) are usually interconnected with the mainland grid by submarine cables. However, once the submarine cable suffers damage, the IMGs will rely on standby diesel units to operate independently with the poor economy and severe pollution. This paper proposes a post-disaster collaborative scheduling strategy for IMG and electric passenger ships (EPS) to address this problem. Firstly, based on the idea of hierarchy-clustering-decoupling, a novel EPS scheduling model is proposed to speed up the solving efficiency. Then, a two-stage post-disaster scheduling strategy is presented with the operating constraints of IMGs. The first stage optimally determines the IMG scheduling plan and the EPS cluster scheduling plan, and the second stage makes decisions on individual EPS scheduling plans. Finally, the numerical simulation verifies the effectiveness of the proposed strategy and the rapidity of the solution. © 2022 IEEE.

关键词： Scheduling

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Hierarchical Coordinated Control Method for Hydrogen-Electric Hybrid Energy Storage System Based on Model Predictive Control 16

Hierarchical Coordinated Control Method for Hydrogen-Electri...

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16th IEEE PES Asia-Pacific Power and Energy engineering Conference, APPEEC 2024

作者： Li, Chao Ma, Xin Zhou, Lei Ding, Maosheng Chen, Xia School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China Electric Power Research Institute State Grid Ningxia Electric Power Co. Ltd Yinchuan750002 China

ISBN: (纸本)9798350386127

Battery energy storage systems (BESS) are widely adopted for frequency regulation in regional power grids. However, their limited capacity is inadequate for long-term power compensation, often curtailing wind and PV generation. This paper combines hydrogen energy storage with BESS to create a hybrid hydrogen-electric power station. A hierarchical coordinated control strategy based on model predictive control (MPC) is proposed for the hybrid power station. The lower layer applies MPC to enhance the BESS's ability to smooth grid frequency fluctuations, enabling faster and more accurate tracking of upper-level power commands. The upper layer optimizes the power generation cost and manages the state of Charge (SOC) of the BESS to reduce the power and capacity allocation of the BESS and improve the service life of each unit. In high-penetration renewable energy microgrids, the proposed strategy's frequency regulation capability, SOC management, and cost optimization were simulated and validated. © 2024 IEEE.

关键词： Hybrid power

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Capacitance loss characteristics of metallized film capacitors under atmospheric corrosion

Capacitance loss characteristics of metallized film capacito...

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2022 IEEE International Conference on High Voltage engineering and Applications, ICHVE 2022

作者： Qiu, Tian Li, Hua Li, Zheng Lin, Fuchang Zhang, Qin Li, Liuxia Wang, Yan School of Electrical and Electronic Engineering Huazhong University of Science & Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (数字)9781665407502

ISBN: (纸本)9781665407502

As the key components, metallized film capacitors (MFCs) are widely used in power system. Working at high temperature and humidity conditions, oxygen and moisture in atmosphere will permeate into MFCs and initiate electrode corrosion, which contributes to capacitance loss, and thus the reliability is reduced. In this work, a capacitance loss model for atmospheric corrosion is proposed to study the aging pattern of MFCs. Accordingly, an accelerated aging test with different temperature-humidity combinations is carried out to investigate the corrosion behavior at various temperature and humidity conditions. The results indicate the corrosion sites tend to distribute around the fibers on polymer films. The capacitance loss rate declines along time because of formation of oxide layers. It is also found temperature has a predominant effect on corrosion process in contrast of humidity. © 2022 IEEE.

关键词： Capacitance

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Optimal Voyage Scheduling of Battery-Swapping Based Inland All-Electric Ship Fleet Considering Environmental Factors and Time-of-Use Electricity Price

Optimal Voyage Scheduling of Battery-Swapping Based Inland A...

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Power and Electrical engineering (ACPEE), 5th Asia Conference on

作者： Shenglong Yang Fan Ma Haishun Sun Lin Sun State Key Laboratory of Advanced Electromagnetic Engineering and Technology (Huazhong University of Science and Technology) National Key Laboratory of Electromagnetic Energy (Naval University of Engineering) Wuhan China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China National Key Laboratory of Electromagnetic Energy Naval University of Engineering Wuhan China

ISBN: (数字)9798350309638

ISBN: (纸本)9798350309645

Inland all-electric ship is receiving more and more attention due to its advantages in terms of low carbon, energy conservation, and flexibility in operation mode. However, its extensive promotion and application are held back by various problems such as long charging time, high cost of energy supplement, environmental factors, etc. In addition, the complexity of the electric ship fleet also poses a challenge to its optimal operation. Hence, an optimal voyage scheduling model of the inland all-electric ship fleet, with departure time and speed of each ship as the decision variables, is firstly established to minimize the total battery-swapping cost and the total waiting time in this paper. Based on the battery-swapping mode, the model takes environmental factors and time-of-use electricity prices into account. Second, adaptive particle swarm optimization is used to solve the proposed model, and the comparative analysis is made. Finally, an all-electric ship fleet operating in the Yangtze River is selected as a study case, and the simulation results show that the proposed model can effectively reduce the total battery-swapping cost and the total waiting time.

关键词： Adaptation models Costs Electricity Simulation Environmental factors Rivers Power systems

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A Novel High Torque Density Spoke-Array Permanent Magnets Vernier Machine with Magnets Bridge

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IEEE Transactions on Industry Applications 2025年

作者： Zhang, Yuwei Zhao, Yu Li, Dawei Qu, Ronghai Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China

In recent years, permanent magnet vernier machine (PMVM) has drawn more attention due to their high torque density. To further improve torque capability, Spoke-array (SA) PM having better flux focusing effect are applied. However, SAPMVM suffers from a considerable torque reduction due to the deteriorated low order working flux harmonics caused by flux barrier effect. Especially, the higher pole ratio (PR), i.e., the ratio of PM pole-pair to armature pole-pair, the severer torque drop of SAPMVM. In this paper, a novel SAPMVM is proposed, where the magnets bridge is introduced, which can effectively restrict the flux barrier effect. As a result, both the working flux harmonics and torque density of SAPMVM are enhanced. To analyze the operating principle of proposed SAPMVM with magnets bridge, an equivalent magnet circuit model is established. Moreover, the electromagnetic performances of the proposed SAPMVM are compared with regular SAPMVM by FEA, where the torque of proposed SAPMVM has increased by 43.3% and 175.6% under rated-load when the PR is selected as 5 and 11. © 1972-2012 IEEE.

关键词： Permanent magnets

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