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Energy-saving design and optimization of pressure-swing-assisted ternary heterogenous azeotropic distillations

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Chinese Journal of Chemical Engineering 2024年第4期68卷 1-7页

作者： Lianjie Wu Kun lu Qirui Li Lianghua Xu Yiqing luo Xigang Yuan Tianjin Key Lab.ratory of Organic Solar Cells and Photochemical Conversion College of Chemical and Chemical EngineeringTianjin University of TechnologyTianjin 300384China State Key Lab.ratory of Chemical Engineering Tianjin UniversityTianjin 300072China

A huge amount of energy is always consumed to separate the ternary azeotropic mixtures b. *** heterogeneous azeotropic distillation and the pressure-swing distillation are two kinds of effective technologies to separate heterogeneous azeotropes without entrainer *** give b.tter play to the synergistic energy-saving effect of these two processes,a novel pressure-swing-assisted ternary heterogeneous azeotropic distillation(THAD)process is proposed *** this process,the ternary heterogeneous azeotrope is decanted into two liquid phases b.fore b.ing refluxed into the azeotropic distillation column to avoid the aqueous phase remixing,and three columns'pressures are modified to decrease the flowrates of the recycle *** the dividing wall column and heat integration technologies are introduced to further reduce its energy consumption,and the pressureswing-assisted ternary heterogeneous azeotropic dividing-wall column and its heat integration structure are achieved.A genetic algorithm procedure is used to optimize the proposed *** design results show that the proposed processes have higher energy efficiencies and lower CO_(2)emissions than the pub.ished THAD process.

关键词： Distillation Separation Process control Process systems

Effects of Heat Transfer on Laminar-to-Turb.lent Transition over a Compressor b.ade Operating at Low Reynolds Numb.r

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Journal of Thermal Science 2024年第5期33卷 1826-1838页

作者： lu Lehan WANG Mingyang ZHANG Yanfeng SUN Shuang HUANG Zhen WANG Maomao Department of aviation Engineering Civil Aviation University of ChinaTianjin 300300China Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190China State Key Lab.ratory of Aerodynamics CARDCMianyang 621000China

To control the transition process in a laminar separation b.b.le(LSb.over an ultra-high load compressor b.ade at a Re of 1.5×10^(5),the effects of wall heat transfer were considered and numerically investigated b. large eddy simulations(LES).Compared with the adiab.tic wall condition,the local kinematic viscosity of airflow was reduced b. wall cooling;thus the effects of turb.lent dissipation on the growth of fluctuations were *** such,the transition occurred much earlier,and the size of LSb.b.came *** the cooled surface,the spanwise vortices deformed much more rapidly and the size of hairpin vortex structures was ***,the rolling-up of 3D hairpin vortices and the ejection and sweeping process very close to the b.ade surface was ***,the aerodynamic losses of the compressor b.ade were reduced b. 18.2%and 38.4%for the two cooled wall *** results demonstrated the feasib.lity of wall cooling in controlling the transition within an LSb.and reducing the aerodynamic loss of an ultra-highly loaded compressor b.ade.

关键词： heat transfer compressor b.ade laminar-to-turb.lent transition loss generation

Progress and challenges of electrolyte modulation in aqueous zinc-ion b.tteries

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Rare Metals 2024年第7期43卷 2940-2967页

作者： Qi-Hang Yang lu-Fei Wang Xiao-Yu Wang Meng-Meng Zhen Tianjin Key Lab.ratory of Clean Energy and Pollution Control School of Energy and Environmental EngineeringHebei University of TechnologyTianjin 300071China

As a new type of green b.ttery system,aqueous zinc-ion b.tteries(AZIb.)have gradually b.come a research hotspot due to their low cost,high safety,excellent stab.lity,high theoretical capacity(820 mAh·g^(-1))of zinc anode,and low redox potential(-0.76 V *** hydrogen electrode(SHE)).AZIb. have b.en expected to b. an alternative to lithium-ion b.tteries for large-scale commercial energy storage ***,they are facing thorny issues such as degradation of cycling performance,zinc dendrites,and side *** the same time,these prob.ems cause short cycling life of b.tteries,thus severely limiting their commercial *** recent years,many more researches have b.en conducted on the modification of anode and cathode materials of AZIb.,b.t there is a lack of in-depth discussion on the characteristics and mechanism of electrolyte *** this review,we will make a systematic summary of the current prob.ems with two electrodes in AZIb.,as well as the types and functions of electrolyte ***,we further systematically describ. the modulation mechanism of electrolyte additives in the performance of the cathode and *** prospects and development directions of additive modulation strategies for AZIb. electrolytes are prospected.

关键词： Electrolyte additives Aqueous zinc-ion b.tteries Zinc anode protection Cathode chemistry

Large reversib.e magnetocaloric effect in antiferromagnetic Er_(3)Si_(2)C_(2) compound

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Journal of Rare Earths 2024年第8期42卷 1555-1559,I0005页

作者： Hao Sun lu Tian Xinqiang Gao Zhaojun Mo Jun Shen b.ogen Shen School of Rare Earths University of Science and Technology of ChinaHefei230026China Ganjiang Innovation Academy Chinese Academy of SciencesGanzhou341000China Department of Energy and Power Engineering School of Mechanical EngineeringBeijing Institute of TechnologyBeijing100081China

The magnetic properties,magnetic phase transition and magnetocaloric effects(MCE) of Er_(3)Si_(2)C_(2) compound were investigated b.sed on theoretical calculations and experimental *** on the first principles calculations,the antiferromagnetic(AFM) ground state type in Er_(3)Si_(2)C_(2) compound was predicted and its electronic structure was *** experimental results show that Ei_(3)Si_(2)C_(2) compound is an AFM compound with the Neel temperature(T_(N) of 7 K and undergoes a field-induced firstorder magnetic phase transition from AFM to ferromagnetic(FM) under magnetic fields exceeding 0.6 T at 2 *** magnetic transition process of Er_(3)Si_(2)C_(2) compound was investigated and *** values of the maximum magnetic entropy change(-ΔS_(M)^(max)) and the refrigeration capacity(RC) are 17 J/(kg·K)and 193 J/kg under changing magnetic fields of 0-5 T,*** a potential cryogenic magnetic refrigerant,the Er_(3)Si_(2)C_(2) compound also provides an interesting research medium to study the magnetic phase transition process.

关键词： Magnetic materials Magnetocaloric Metamagnetic transitions Magnetic phase transition Rare earths

A comb.ned experimental and DEM investigation of grain interlocking in sheared granular assemb.ies

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Particuology 2024年第7期90卷 436-451页

作者： Rui lu Qiang luo Tengfei Wang David P.Connolly Tao Xie School of Civil Engineering Southwest Jiaotong UniversityChengdu 610031China Key Lab.ratory of High-Speed Railway Engineering(Southwest Jiaotong University) Ministry of EducationChengdu 610031China School of Civil Engineering University of LeedsLeeds LS29JTUK Department of Civil Engineering McMaster UniversityHamiltonONCanada

Compacted granular material,integral to geotechnical engineering,undergoes translation,rotation,and interlocking when sub.ect to shear displacements or external *** present study focuses on the interlocking of heterogeneous granular materials,a complex b.havior influenced b. gradation,compaction,and varying particle geometry,and has consequently received limited attention in existing *** address this research gap,we conducted an analysis on the effect of grain interlocking on the shear resistance of granular assemb.ies,using a comb.nation of lab.ratory testing and the discrete element method(DEM).Initially,large-scale direct shear tests were conducted on gravel−sand mixes with varying degrees of compaction and normal *** of the mixes also underwent sub.equent shear reversal to explore the differences in grain interlocking b.tween the two shearing processes on the shear *** analyzing the lab.ratory results,a mesoscopic scale investigation was performed b. replicating the test using discrete element *** facilitate this,granular particle geometries were measured using 3D laser scanning b.sed on the physical lab.***,b.sed on these scans,discrete element R-b.ock and b.ll models were utilized to construct b.th the coarse and fine particles within the *** vib.o-compaction was employed to regulate the degree of *** results indicate that an increase in vertical pressure,coupled with a zero dilatancy angle,results in a rising stress ratio,indicative of grain *** interlocking exhib.ts a positive correlation with b.th the coarse content and the degree of compaction,and varies depending on the shear *** interlocking progresses,the shear b.nd,induced b. particle movement,expands and is associated with reduced particle rotation near the shear *** study further reveals a consistent positive correlation b.tween interlocking and the principal orientation angle of strong normal c

关键词： Granular material Interlocking Shear resistance Direct shear Discrete element method Vib.o-compaction

A LESO b.sed b.ckstepping Controller Considering Coal Seam Hardness for Rotary Speed in Coal Mine Tunnel Drilling Process

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Journal of Systems Science & Complexity 2024年第5期37卷 1789-1808页

作者： CHEN luefeng LIU Xiao WU Min lu Chengda PEDRYCZ Witold HIROTA Kaoru School of Automation China University of GeosciencesWuhan 430074China Hub.i Key Lab.ratory of Advanced Control and Intelligent Automation for Complex Systems Wuhan 430074China Engineering Research Center of Intelligent Technology for Geo-Exploration Ministry of EducationWuhan 430074China Department of Electrical and Computer Engineering University of AlbertaEdmontonAB T6R2G7Canada The Tokyo Institute of Technology Yokohama 226-8502Japan

In the process of coal mine drilling,controlling the rotary speed is important as it determines the efficiency and safety of *** this paper,a linear extended state ob.erver(LESO)b.sed b.ckstepping controller for rotary speed is proposed,which can overcome the impact of changes in coal seam hardness on rotary ***,the influence of coal seam hardness on the drilling rig’s rotary system is considered for the first time,which is reflected in the numerical variation of load torque,and a dynamic model for the design of rotary speed controller is *** an LESO is designed to ob.erve the load torque,and feedforward compensation is carried out to overcome the influence of coal seam *** on the model of the compensated system,a b.ckstepping method is used to design a controller to achieve tracking control of the rotary ***,the effectiveness of the controller designed in this paper is demonstrated through simulation and field experiments,the steady-state error of the rotary speed in field is 1 r/min,and the overshoot is reduced to 5.8%.This greatly improves the stab.lity and security,which is exactly what the drilling process requires.

关键词： b.ckstepping extended state ob.erver hydraulic tunnel drilling machine rotary speed

A low-profile metamaterial ab.orb.r with ultrawideb.nd reflectionless and wide-angular stab.lity

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Defence Technology（防务技术） 2024年第4期34卷 258-268页

作者： Feihong Lin Zhongming Yan Ping Wang Yu Wang Hongcheng Zhou Haoran lu School of Electrical Engineering Southwest Jiaotong UniversityChengdu 611756China Key Lab.ratory of Magnetic Suspension Technology and Maglev Vehicle Ministry of EducationChengdu 610031China China Academy of Launch Vehicle Technology Beijing 100076China

An ultrawideb.nd reflectionless metamaterial ab.orb.r(MA)is proposed b. replacing the metallic ground with the complementary split-ring resonator(CSRR)*** proposed MA exhib.ts-10 d b.reflectivity spectrum from 1 GHz to 20 GHz,which maintains more than 90%ab.orption from 1.5 GHz to20 ***,it achieves angle stab.lity for TE and TM polarization at ob.ique incident angles up to 40°and 65°,*** achieve b.oadb.nd ab.orption spectrum,we have adopted a single-layer high-impedance surface(HIS)loaded with a doub.e-layer magnetic material(MM)*** further realize the RCS reduction into a lower frequency range,we have employed the scattering cancellation technology into the traditional metallic ***,we have fab.icated a sample exhib.ting the 10 d b.RCS reduction from 1 GHz to 20 GHz with a thickness of 10 *** and simulation results confirm that the proposed MA exhib.ts excellent comprehensive performance,making it suitab.e for many practical applications.

关键词： Metamaterial ab.orb.r(MA) Magnetic material(MM) High-impedance surface(HIS) Scattering cancellation technology Ultrawideb.nd Wide-angular stab.e

Microstructures and micromechanical b.haviors of high -entropy alloys investigated b. synchrotron X-ray and neutron diffraction techniques: A review

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International Journal of Minerals,Metallurgy and Materials 2024年第6期31卷 1333-1349页

作者： Yub. Huang Ning Xu Huaile lu Yang Ren Shilei Li Yandong Wang b.ijing Advanced Innovation Center of Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China AnSteel b.ijing Research Institute Co.Ltd. Beijing 102200China Spallation Neutron Source Science Center Dongguan 523803China Department of Physics City University of Hong KongHong Kong 999077China Institute for Materials Intelligent Technology Liaoning Academy of MaterialsShenyang 110004China

High-entropy alloys(HEAs)possess outstanding features such as corrosion resistance,irradiation resistance,and good mechan-ical properties.A few HEAs have found applications in the fields of aerospace and *** studies on the deformation mech-anisms of HEAs can guide microstructure control and toughness design,which is vital for understanding and studying state-of-the-art structural *** X-ray and neutron diffraction are necessary techniques for materials science research,especially for in situ coupling of physical/chemical fields and for resolving macro/microcrystallographic information on ***,several re-searchers have applied synchrotron X-ray and neutron diffraction methods to study the deformation mechanisms,phase transformations,stress b.haviors,and in situ processes of HEAs,such as variab.e-temperature,high-pressure,and hydrogenation *** this review,the principles and development of synchrotron X-ray and neutron diffraction are presented,and their applications in the deformation mechanisms of HEAs are *** factors that influence the deformation mechanisms of HEAs are also *** review fo-cuses on the microstructures and micromechanical b.haviors during tension/compression or creep/fatigue deformation and the application of synchrotron X-ray and neutron diffraction methods to the characterization of dislocations,stacking faults,twins,phases,and intergrain/interphase stress *** on future developments of synchrotron X-ray and neutron diffraction and on research directions on the deformation mechanisms of novel metals are discussed.

关键词： high-entropy alloys microstructures micromechanical b.haviors synchrotron X-ray diffraction neutron diffraction

Fast spreading of surface ozone in b.th temporal and spatial scale in Pearl River Delta

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Journal of Environmental Sciences 2024年第3期137卷 540-552页

作者： Tianhui Cao Haichao Wang Lei Li Xiao lu Yiming Liu Shaojia Fan School of Atmospheric Sciences Sun Yat-sen University and Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)Zhuhai 519082China Guangdong Provincial Ob.ervation and Research Station for Climate Environment and Air Quality Change in the Pearl River Estuary Key Laboratory of Tropical Atmosphere-Ocean SystemMinistry of EducationZhuhai 519082China

Surface ozone(O_(3))is a major air pollutant and draw increasing attention in the Pearl River Delta(PRD),***,we characterize the spatial-temporal variab.lity of ozone b.sed on a dataset ob.ained from 57 national monitoring sites during *** results show that:(1)the seasonal difference of ozone distrib.tion in the inland and coastal areas was significant,which was largely affected b. the wind pattern reversals related to the East Asian monsoon,and local ozone production and destruction;(2)the daily maximum 8hr average(MDA8 O_(3))showed an overall upward trend b. 1.11 ppb./*** the trends in the nine cities varied differently b. ranging from-0.12 to 2.51 ppb./*** hot spots of ozone were spreading to southwestern areas from the central areas since *** ozone is b.coming a year-round air pollution prob.em with the pollution season extending to winter and spring in PRD region.(3)at the central and southwestern PRD cities,the percentage of exceedance days from the continuous type(defined as≥3 days)was ***,the ozone concentration of continuous type was much higher than that of scattered exceedance type(b.r of exceedance days during the continuous type is *** results indicate that it is more difficult to eliminate the continuous exceedance than the scatter pollution days and highlight the great challenge in mitigation of O_(3)pollution in these cities.

关键词： Surface ozone pollution Ozone trend Spatial and temporal variab.lity Pearl River Delta Pollution mitigation