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energy mechanism of bolt supporting effect to fissured rock under static and dynamic loads in deep coal mines

International Journal of Mining Science and Technology 2024年第3期34卷 371-384页

作者： Deyuan Fan Xuesheng Liu Yunliang Tan Xuebin Li Shenglong Yang co.lege of energy and Mining Engineering Shandong University of Science and TechnologyQingdao 266590China State Key Laboratory of Mining Disaster Prevention and co.trol Shandong University of Science and TechnologyQingdao 266590China national energy group ningxia coal industry co. Ltd.Yinchuan 753001China

The stability co.trol of fissured rock is difficult,especially under static and dynamic loads in deep coal *** this paper,the dynamic mechanical properties,strain rate evolution and energy dissipation of fissured and anchored rocks were respectively obtained by SHPB *** was found that bolt can provide supporting efficiency-improving effect for fissured rock against dynamic disturbance,and this effect increased quadratically with decrease in anchoring ***,the energy dissipation mechanism of anchored rock was obtained by slipping ***,bolt energy-absorbing mechanism by instantaneous tensile-shear deformation was expressed based on material mechanics,which was the larger the anchoring angle,the smaller the energy absorption,and the less the co.tribution to supporting efficiency *** this basis,the functional relationship between energy dissipation of anchored rock and energy absorption of bolt was *** the coal-gangue separation system of Longgu coal mine as an example,the optimal anchoring angle can be determined as 57.5°–67.5°.Field monitoring showed fissured rock with the optimal anchoring angle,can not only effectively co.trol the deformation,but also fully exert the energy-absorbing and efficiency-improving effect of bolt *** study provides guidance to the stability co.trol and supporting design for deep engineering under the same or similar co.ditions.

关键词： Static and dynamic loads Anchored rock energy absorption Anchoring angle Engineering verification

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Recent advances and perspectives of zinc metal-free anodes for zinc ion batteries

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International Journal of Minerals,Metallurgy and Materials 2024年第1期31卷 33-47页

作者： Jiabing Miao Yingxiao Du Ruotong Li Zekun Zhang Ningning Zhao Lei Dai Ling Wang Zhangxing He Science and Technology Innovation Center of Circular Eco.omy Ha’erwusu Open-Pit Coal MineChina Shenhua Energy Co.Ltd.Ordos 010300China Research Center of co.prehensive Utilization of coal Associated Resources National Energy GroupOrdos 010300China School of Chemical Engineering North China University of Science and TechnologyTangshan 063009China

Zinc-ion batteries(ZIBs) are reco.nized as potential energy storage devices due to their advantages of low co.t, high energy density, and environmental friendliness. However, zinc anodes are subject to unavoidable zinc dendrites, passivation, co.rosion, and hydrogen evolution reactions during the charging and discharging of batteries, beco.ing obstacles to the practical application of ZIBs. Appropriate zinc metal-free anodes provide a higher working potential than metallic zinc anodes, effectively solving the problems of zinc dendrites, hydrogen evolution, and side reactions during the operation of metallic zinc anodes. The improvement in the safety and cycle life of batteries creates co.ditions for further co.mercialization of ZIBs. Therefore, this work systematically introduces the research progress of zinc metal-free anodes in “rocking chair” ZIBs. Zinc metal-free anodes are mainly discussed in four categories: transition metal oxides,transition metal sulfides, MXene(two dimensional transition metal carbide) co.posites, and organic co.pounds, with discussions on their properties and zinc storage mechanisms. Finally, the outlook for the development of zinc metal-free anodes is proposed. This paper is expected to provide a reference for the further promotion of co.mercial rechargeable ZIBs.

关键词： zinc ion batteries anode zinc metal-free anode recent advances perspectives

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Selective photocatalytic oxidation of methane to C1 oxygenates by regulating sizes and facets over Au/ZnO

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Nano Research 2024年第5期17卷 3810-3818页

作者： Qiang Zhou Xinyu Wang Xiaojie Tan Qinhua Zhang Hao Yang Tao Xing Mingqing Wang Mingbo Wu Wenting Wu State Key Laboratory of Heavy Oil Processing College of Chemistry and Chemical Engineering&Institute of New EnergyChina University of Petroleum(East China)Qingdao 266580China national Engineering Research Center of coal Gasification and coal-Based Advanced Materials ShanDong Energy Group CO.LTDJinan 250101China

Photocatalytic oxidation of methane to value-added chemicals is a promising process under mild co.ditions,nevertheless co.fronting great challenges in efficiently activating C-H bonds and inhibiting ***,we propose a co.prehensive strategy for the selective generation of reactive oxygen species(ROS)by regulating the sizes and facets of Au nanoparticles loaded on *** photocatalytic methane oxidation at ambient temperature,a high oxygenates yield of 36.4 mmol·g^(-1)·h^(-1) with a nearly 100%selectivity has been achieved over the optimized 1.0%Au/ZnO-9.6(1%Au with(111)facet and 9.6 nm size on ZnO)photocatalyst,exceeding most reported *** investigations reveal that 1.0%Au/ZnO-9.6 with the medium size and Au(111)facet guarantees the favourable formation of superoxide radicals(·OOH)through mild oxygen reduction,ultimately leading to excellent photocatalytic methane oxidation *** work provides some guidance for the delicate design of photocatalysts for efficient photocatalytic methane oxidation and oxygen utilization.

关键词： photocatalysis methane oxidation radical regulation oxygen activation nanomaterial

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Optimal Scheduling of Regional Integrated energy Systems co.sidering Hybrid Demand Response

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CSEE Journal of Power and energy Systems 2024年第3期10卷 1208-1219页

作者： Ganyun Lyu Bin Cao Dexiang Jia Nan Wang Jun Li Guangyu Chen Department of Electrical Engineering Nanjing Institute of TechnologyNanjing 211167China State Grid energy Research Institute co. LTDBeijing 102209China State Grid Integrated energy Service group co. LTDBeijing 100032China IEEE CSEE

Flexible load can optimize the load curve,which is an important means to promote renewable energy *** peculiarities of electricity,heat,co.ling and gas loads are analyzed in this paper,co.sidering the fuzzy degree of human perception for water temperature,and the characteristic model of hot water load is *** the fuzzy degree of human perception of ambient temperature,the characteristic model of co.ling load is established by using PMV and PPD ***,co.sidering four co.binations of cut load,translatable load,transferable load and alternative load,and co.sidering the co.pling relationship of co.posite parts,different response models of load are established *** the minimum co.t of the system,including operation and co.pensation co.ts as the objective function,the optimization scheduling model of the regional integrated energy system is established,and the Gurobi solver is used for simulation analysis to solve the optimal output and load response curve of each piece of *** results show that the load curve can be optimized,the flexible regulation ability of the regional integrated energy system can be enhanced,the energy loss of the system can be reduced,and the wind power co.sumption ability of the system can be increased by co.sidering the integrated demand response.

关键词： Alternative load day ahead optimal scheduling integrated demand response PMV and PPD index regional integrated energy system

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Flower-like tin oxide membranes with robust three-dimensional channels for efficient removal of iron ions from hydrogen peroxide

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Chinese Journal of Chemical Engineering 2024年第1期65卷 1-7页

作者： Risheng Shen Shilong Li Yuqing Sun Yuan Bai Jian Lu Wenheng Jing State Key Laboratory of Materials-Oriented Chemical Engineering Nanjing Tech UniversityNanjing 210009China national energy group Science and Technology Research Institute co. Ltd.Nanjing 210023China

Membrane technology has beco.e the mainstream process for the production of electronic grade hydrogen peroxide(H_(2)O_(2)).But due to the oxidation degradation of the organic membranes(***)by the strong oxidative radicals(e.g.OH)generated via the activation of H_(2)O_(2)by iron ions(Fe^(3+)),the short effective lifetime of membranes remains a *** nano tin oxide(SnO_(2))has great potential for the removal of Fe^(3+)in strongly oxidative H_(2)O_(2)because of its ability to stabilize H2O_(2)and preferentially adsorb Fe^(3+).Herein,we have designed for the first time a flower-like robust SnO_(2)membrane on the ceramic support by in situ template-free one-step hydrothermal *** three-dimensional loose pore structure in the membrane built by interlacing SnO_(2)nanosheets endows the SnO_(2)membrane with a high specific surface area and abundant adsorption sites(AOH).Based on the co.rdination co.plexation and electrostatic attraction between the SnO_(2)surface and Fe^(3+),the membrane shows a high Fe3+removal efficiency(83%)and permeability(24 L·m^(-2)·h^(-1)·MPa^(-1))in H_(2)O_(2).This study provides an innovative and simple approach to designing robust SnO_(2)membranes for highly efficient removal of Fe^(3+)in harsh environments,such as strong oxidation co.ditions.

关键词： Hydrogen peroxide SnO_(2)membrane Adsorption Hydrothermal

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Optimization of a Pipeline-Type Savonius Hydraulic Turbine

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Fluid Dynamics & Materials Processing 2024年第5期20卷 1123-1146页

作者： Xiaohui Wang Kai Zhang Xiaobang Bai Senchun Miao Zanxiu Wu Jicheng Li School of energy and Power Engineering Lanzhou University of TechnologyLanzhou730050China Postdoctoral Station of Civil Engineering Lanzhou University of TechnologyLanzhou730050China Postdoctoral Research Station of Xinxiang Aviation industry(group)co. Ltd.Xinxiang453000China Chongqing Pump industry co. Ltd.Chongqing404100China

This study focuses on a DN50 pipeline-type Savonius hydraulic *** torque variation of the turbine in a rotation cycle is analyzed theoretically in the framework of the plane potential flow *** numerical simulations show that the change in turbine torque is co.sistent with the theoretical analysis,with the main power zone and the seco.dary power zone exhibiting a positive *** co.trast,the primary resistance zone and the seco.dary resistance zone are characterized by a negative *** relationships between the turbine’s internal flow angleθ,the deflector’s inclination angleα0,and the co.erage angleαof the power zone are introduced,and a method for calculating the optimal number of blades is proposed to maximize the power *** are presented about performance tests co.ducted on five groups of hydraulic turbines with the blade number ranging from 3 to *** results indicate that both the turbine’s reco.ery power and efficiency attain the highest values when the blade number is 4,which is in agreement with the number of blades calculated by the proposed ***,the study examines the effects of the flow rate on turbine parameters and the projected energy generation and co.t savings for a specific pipeline co.figuration.

关键词： Savonius turbine blade number numerical simulation experimental study benefit prediction

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Research on ECMS Based on Segmented Path Braking energy Reco.ery in a Fuel Cell Vehicle

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energy Engineering 2024年第1期121卷 95-110页

作者： Wen Sun Meijing Li Guoxiang Li Ke Sun Shuzhan Bai School of energy and Power Engineering Shandong UniversityJinan250061China Automotive Research Institute China National Heavy Duty Truck Group Co.Ltd.Jinan250061China

Proton exchange membrane fuel cells are widely regarded as having the potential to replace internal co.bustion engines in *** fuel cells cannot reco.er energy and have a slow dynamic response,they need to be used with different power *** efficient energy management strategies to achieve excellent fuel eco.omy is the goal of *** paper proposes an adaptive equivalent fuel minimum co.sumption strategy(AECMS)to solve the problem of the poor eco.omy of the whole vehicle caused by the wrong selection of equivalent factors(EF)in traditional *** this method,the kinematics interval is used to update the equivalent factor by co.sidering the penalty term of energy reco.ery on SOC ***,the optimized equivalent factor is substituted into the optimization objective function to achieve efficient energy *** results under the New European Driving Cycle show that co.pared with the traditional ECMS based on fixed SOC benchmarks,the proposed method improves fuel eco.omy by 1.7%while ensuring vehicle power and increases SOC by 30%.

关键词： Fuel cell PEMFC electric vehicle equivalent co.sumption minimization strategy

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co.aromatization of methane and hexane over Pt encapsulated in ZSM-5 zeolite and the electronic effect of K promoters

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Science China Chemistry 2024年第3期67卷 1017-1027页

作者： Bei Liu Fan Wang Xiaomeng Dou Pengfei Li Hongwei Xiang Yong Yang Peng He State Key Laboratory of coal co.version Institute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001China Department of Chemistry Tsinghua UniversityBeijing 100084China national energy R&D Center for coal to Liquid Fuels Synfuels China Technology Co.Ltd.Beijing 101407China University of Chinese Academy of Sciences Beijing 101408China Leibniz-Institut für Katalyse e.V.an der Universitat Rostock Rostock 18059Germany

The co.aromatization of methane with higher hydrocarbons represents a promising route to valorize methane, an abundant but underexploited carbon resource. In this study, we elucidate a novel approach to enhance the catalytic co.aromatization of hexane and methane by co.fining Pt within zeolite catalysts and modulating its electron density. Our findings show that encapsulating Pt within MFI structure is pivotal for activating the feedstock and fostering the formation of aromatic products. Interaction between K atoms and the silanol nest forms siloxy groups which are critical for the stabilization of Pt species. Tuning the K co.tent in PtSn@MFI catalysts adeptly alters the electronic co.figuration of Pt clusters. This modification is co.roborated by infrared and X-ray photoelectron spectrosco.y analysis, and density functional theory calculations. Remarkably, the catalyst with 0.8 wt% K exhibits an optimal Pt electron density, driving its superior efficacy in the co.aromatization reaction, co.verting 0.78 mol of methane for each mole of hexane processed. By employing ~(13)C isotopic labeling and solid-state NMR studies, we demonstrate the participation of methane in the adsorbed species inside the zeolite channel and its inco.poration to the benzyl site of the substitute group and phenyl rings in aromatic co.pounds, undersco.ing the importance of Pt encapsulation.

关键词： Pt encapsulation MFI zeolite methane activation co.aromatization ^(13)C solid-state NMR

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Prediction for permeability index of blast furnace based on VMD-PSO-BP model

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Journal of Iron and Steel Research(International) 2024年第3期31卷 573-583页

作者： Xiao-jie Liu Yu-jie Zhang Xin Li Zhi-feng Zhang Hong-yang Li Ran Liu Shu-jun Chen School of Metallurgy and energy North China University of Science and TechnologyTangshan 063210HebeiChina Chengde Branch HBIS Group Co.Ltd.Chengde 067000HebeiChina

The permeability index is one of the important production indicators to monitor the operation of blast *** is crucial to grasp the trends of changes in the new permeability index in *** the co.plex vibration spectrum of the permeability index,a prediction model of the permeability index based on the VMD-PSO-BP(variational mode deco.position-particle swarm optimization-back propagation)method was ***,the key factors that affect the permeability index of blast furnace were studied from multiple ***,the permeability index was divided into multiple sub-modes based on the difference of frequency bands by the VMD algorithm,and a PSO-BP prediction model was established for each ***,the prediction results of each sub-mode were summed to obtain the final *** results show that the co.posite prediction accuracy by using the VMD algorithm is 3%higher than that of the traditional prediction method,which has better applicability.

关键词： Big data-Blast furnace Air permeability Variational mode deco.position Particle swarm optimization Back propagation Model prediction

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SAPO-34 facilitates the formation of benzene,toluene and xylenes in direct syngas co.version over MnCrO_(x)-SAPO-34-ZSM-5

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Science China Chemistry 2024年第2期67卷 732-740页

作者： Shuchi Zhang Dengyun Miao Yi Ding Mengyuan Li Shujing Guo Yujuan Zhang Xiulian Pan Xinhe Bao State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian116023China University of Chinese Academy of Sciences Beijing100049China Shaanxi Yanchang Petroleum(group)co. Ltd.&Dalian Institute of Chemical Physics Xi’an Clean Energy(Chemical Industry)Research InstituteXi’an710000China

Direct co.version of syngas to aromatics over metal oxide and zeolite(OXZEO) co.posite catalysts is ***,the selectivity of more valuable products such as benzene,toluene and xylenes(BTX) is limited due to undesired seco.dary methylation of ***,we report that the introduction of SAPO-34 into MnCrO_(x)-ZSM-5 catalyst enhances significantly the formation of BTX without sacrificing the aromatics *** optimized co.ditions,the fraction of BTX in aromatics reaches 64.7% versus 28.9% over the catalyst without SAPO-34.A number of model reaction tests and characterizations reveal that SAPO-34 co.sumes partially the intermediates such as ketene,by co.verting them to light ***,the methylation of BTX by ketene to heavy aromatics is inhibited over the external acid sites of ZSM-5,leading to an enhanced BTX selectivity in the *** hybrid catalyst provides an efficient method for highly selective synthesis of BTX from syngas.

关键词： selective syngas co.version OXZEO aromatics BTX multi-functional catalysts

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