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Multi-objective optimization for membrane reactor for steam methane reforming heated by molten salt

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Science China(Technological Sciences) 2022年第6期65卷 1396-1414页

作者： CHEN Lingen LI PengLei XIA ShaoJun KONG rui ge YanLin Institute of Thermal Science and Power Engineering Wuhan Institute of TechnologyWuhan 430205China College of Power Engineering Naval University of EngineeringWuhan 430033China Hubei Provincial Engineering Technology Research Center of Green Chemical Equipment Wuhan 430205China School of Mechanical&Electrical Engineering Wuhan Institute of TechnologyWuhan 430205China

A membrane reactor for steam methane reforming heated by molten salt(MS-SMRMR)is studied based on finite time thermodynamics for decreasing carbon emissions and improving hydrogen production rate(HPR).Effects of flow directions of sweep gas and molten salt on MS-SMRMR are *** of temperatures,HPR,and local entropy generation rates(EGRs)of MS-SMRMR are *** particle swarm optimization algorithm is utilized to obtain the minimum of specific EGR(SEGR),ratio of EGR to ***-objective optimization about HPR maximization and EGR minimization is performed by utilizing *** EGR caused by the mass transfer process is the largest among all irreversible processes in the *** membrane length should be slightly shorter than the reactor length when the flow direction of sweep gas is different from that of reaction *** flow directions of molten salt and sweep gas are opposite to that of reaction mixture,SEGR is the *** with SEGR calculated by utilizing initial parameters,SEGRs after primary,twice and triple optimizations reduce by 1.2%,5.5%and 5.7%,*** can be further decreased by adjusting other operating *** front provides many optimization results,and it contains SEGR *** Pareto front,an optimum decision point is obtained based on decision-making of TOPSIS,and its EGR and HPR,respectively,increase by 7.12%and13.24%,compared with those obtained by using initial *** results have certain theoretical guiding significance for optimization designs of MS-SMRMR.

关键词： finite time thermodynamics steam methane reforming membrane reactor specific entropy generation rate multiobjective optimization

Analysis of the energy-minimization multiscale model with multiobjective optimization

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Particuology 2020年第1期18卷 109-115页

作者： yi Mo Mengjie Du Wei ge Pingwen Zhang School of Mathematical Sciences Peking UniversityBeijing 100871China State Key Laboratory of Multi-phase Complex Systems(MPCS) Institute of Processing Engineering(IPE)Chinese Academy of Sciences(CAS)Beijing 100190China School of Chemical Engineering University of the Chinese Academy of Sciences(UCAS)Beijing 100049China

Gas-solid two-phase flow is ubiquitous in nature and many engineering fields,such as chemical engineering,energy,and *** closure of its hydrodynamic model is difficult owing to the complex multiscale structure of such *** address this problem,the energy-minimization multi-scale(EMMS)model introduces a stability condition that presents a compromise of the different dominant mechanisms involved in the systems,each expressed as an extremum ***,in the physical system,each dominant mechanism should be expressed to a certain extent,and this has been formulated as a multiobjective optimization problem according to the EMMS principle generalized from the EMMS *** mathematical properties and physical meanings of this multiobjective optimization problem have not yet been *** paper presents a numerical solution of this multiobjective optimization problem and discusses the correspondence between the solution characteristics and flow regimes in gas-solid *** suggests that,while the most probable flow structures may correspond to the stable states predicted by the EMMS model,the noninferior solutions are in qualitative agreement with the observable flow structures under corresponding *** demonstrates that both the dominant mechanisms and stability condition proposed for the EMMS model are physically reasonable and consistent,suggesting a general approach of describing complex systems with multiple dominant mechanisms.

关键词： Energy-minimization multi-scale model Multiobjective optimization Flow regime transition

Total entropy generation rate minimization configuration of a membrane reactor of methanol synthesis via carbon dioxide hydrogenation

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Science China(Technological Sciences) 2022年第3期65卷 657-678页

作者： LI PengLei CHEN Lingen XIA ShaoJun KONG rui ge YanLin Institute of Thermal Science and Power Engineering Wuhan Institute of TechnologyWuhan 430205China Hubei Provincial Engineering Technology Research Center of Green Chemical Equipment Wuhan 430205China College of Power Engineering Naval University of EngineeringWuhan 430033China School of Mechanical&Electrical Engineering Wuhan Institute of TechnologyWuhan 430205China

The total entropy generation rate,internal exergy loss and exergy efficiency of the membrane reactor of methanol synthesis via carbon dioxide hydrogenation are compared,and the results show that the total entropy generation rate minimization is equivalent to the internal exergy loss minimization and the exergy efficiency maximization under the fixed inlet ***,this paper optimizes the membrane reactor with total entropy generation rate minimization as an optimization objective under a fixed methanol production *** optimal temperatures curves of exterior walls for three optimal membrane reactors with different boundary conditions are obtained by using optimal control theory and nonlinear *** influences of other geometric and operating parameters on optimization results of optimal membrane reactors are *** results indicate that when inlet temperatures of the reaction mixture and mixture in the permeable tube are unfixed,the optimizing curve of exterior wall temperature makes the total entropy generation rate of membrane reactor reduce by 12.39%compared with the total entropy generation rate of a reference membrane reactor with a linear exterior wall *** the inlet molar flow rate of sweep gas and gas hourly space velocity and increasing inlet pressure of reaction mixture,the inlet pressure of mixture in the permeable tube and heat transfer coefficients are favorable for decreasing the total entropy generation rate in the membrane *** the porosity of catalyst bed and reactor length increases,the minimum total entropy generation rate decreases first and then *** the perspective of engineering application,this paper establishes two membrane reactors(membrane reactor heated by three-stage furnaces of the same length and membrane reactor heated by threestage furnaces of different lengths),*** minimum total entropy generation rates of the two reactors are reduced by11.67%and 11.79%compare

关键词： membrane reactor methanol synthesis via carbon dioxide hydrogenation multi-stage furnaces finite-time thermo-dynamics entropy generation rate minimization optimal configuration

Mechanism-inspired Design of Heterodinuclear Catalysts for Copolymerization of Epoxide and Lactone

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Chinese Journal of Polymer Science 2020年第9期38卷 950-957,I0006页

作者： Wei-Min Ren rui-Jing Wang Bai-Hao Ren ge-ge Gu Tian-Jun Yue State Key Laboratory of Fine Chemicals Dalian University of TechnologyDalian 116024China

Polyesters,as a class of high-performance and versatile polymer materials,often suffer from some drawbacks,such as hydrophobicity and brittleness due to their single structure ***,modifications have attracted much attention for enhancing their desirable properties,of which one efficient way is incorporating the aliphatic polyether segment into the main chain of the ***,this approach is of much challenge because the obtained polyesters are problematic in either low alternating degree or low molecular ***,we describe an efficient strategy to incorporate polyether fragment into polyester by developing a novel Co-Al based heterodinuclear complex for mediating the copolymerization of propylene oxide(PO)withε-caprolactone(CL).The tracking experiments reveal that PO and CL convert into the polymer chain throughout the polymerization ***,the linear increase in the molecular weight with conversion of CL indicates the controllable nature of the *** competition polymerization,offering the monomer reactivity ratios of rCL=0.96 and rPO=1.04,suggests that the tendency of self-propagation or incorporation of monomers is nearly ***,the obtained polymers with different ether contents exhibit tunable thermal properties with enhanced decomposition temperature for the polymer with higher ether *** newly developed heterodinuclear complex for new polymerization provides an idea to synthesize new functional polymeric materials.

关键词： Heterodinuclear catalysis Polyester-polyether copolymer Lactone Epoxide Copolymerization

An all-organic aqueous potassium dual-ion battery

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Journal of Energy Chemistry 2021年第6期30卷 28-33,I0002页

作者： Junmin ge Xianhui yi Ling Fan Bingan Lu School of Physics and Electronics State Key Laboratory of Advanced Design and Manufacturing for Vehicle BodyHunan UniversityChangsha 410082HunanChina Fujian Strait Research Institute of Industrial Graphene Technologies Quanzhou 362000FujianChina

Benefiting from the environmental friendliness of organic electrodes and the high security of aqueous electrolyte,an all-organic aqueous potassium dual-ion full battery(APDIB) was assembled with 21 M potassium bis(fluoroslufonyl)imide(KFSI) water-in-salt as the *** APDIB could deliver a reversible capacity of around 50 mAh g^(-1) at 200 mA g^(-1)(based on the weight of total active materials),a long cycle stability over 900 cycles at 500 mA g^(-1) and a high coulombic efficiency of 98.5%.The reaction mechanism of APDIB during the charge/discharge processes is verified:the FSI-could associate/disassociate with the nitrogen atom in the polytriphenylamine(PTPAn) cathode,while the K^(+) could react with C=O bonds in the 3,4,9,10-perylenetetracarboxylic diimide(PTCDI) anode *** work contributes toward the understanding the nature of water-into-salt electrolyte and successfully constructed all-organic APDIB.

关键词： All-organic electrode Potassium ion battery Dual-ion full battery Aqueous high concentration electrolyte High safety

ge Complementary Tunneling Field-Effect Transistors Featuring Dopant Segregated Nige Source/Drain

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Chinese Physics Letters 2018年第11期35卷 70-73页

作者： Junkang Li yiming Qu Siyu Zeng Ran Cheng rui Zhang yi Zhao College of Information Science & Electronic Engineering Zhejiang University

ge complementary tunneling field-effect transistors（TFETs） are fabricated with the Nige metal source/drain（S/D） structure. The dopant segregation method is employed to form the Nige/ge tunneling junctions of sufficiently high Schottky barrier heights. As a result, the ge p-and n-TFETs exhibit decent electrical properties of large ON-state current and steep sub-threshold slope（S factor）. Especially, I_d of 0.2 μA/μm is revealed at V_g-V_（th） = V_d = ±0.5 V for ge pTFETs,with the S factor of 28 mV/dec at 7 K.

关键词： ge Complementary Tunneling Field-Effect Transistors Featuring Dopant Segregated Nige Source/Drain MOSFET

Dynamic evolution of vortex structures induced bytri-electrode plasma actuator

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Chinese Physics B 2020年第2期29卷 337-345页

作者： Bo-rui Zheng Ming Xue Chang ge School of Automation and Information Engineering Xi'an University of TechnologyXi'an 710048China Department of Aeronautics and Astronautics Northwestern Polytechnical UniversityXi'an 710072China

Plasma flow control is a new type of active flow control approach based on plasma pneumatic *** barrier discharge(DBD) actuators have become a focus of international aerodynamic ***,the practical applications of typical DBDs are largely restricted due to their limited discharge area and low relative-induced *** further improvement of performance will be beneficial for engineering *** this paper,high-speed schlieren and high-speed particle image velocimetry(PIV) are employed to study the flow field induced by three kinds of plasma actuations in a static atmosphere,and the differences in induced flow field structure among typical DBD,extended DBD(EX-DBD),and tri-electrode sliding discharge(TED) are *** analyzing of the dynamic evolution of the maximum horizontal velocity over time,the velocity profile at a fixed horizontal position,and the momentum and body force in a control volume reveals that the induced velocity peak value and profile velocity height of EX-DBD are higher than those of the other two types of actuation,suggesting that EX-DBD actuation has the strongest temporal aerodynamic effect among the three types of *** TED actuation not only can enlarge the plasma extension but also has the longest duration in the entire pulsed period and the greatest influence on the height and width of the airflow near the wall ***,the TED actuation has the ability to continuously influencing a larger three-dimensional space above the surface of the nlasma actuator.

关键词： plasma flow control dielectric barrier discharge vortex dynamics tri-electrode sliding discharge

Cardiac tissue-derived extracellular matrix scaffolds for myocardial repair:advantages and challenges

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Regenerative Biomaterials 2019年第4期6卷 185-199页

作者： Pawan KC yi Hong ge Zhang Department of Biomedical Engineering The University of AkronOlson Research CenterRoom 301L260 S Forge StreetAkronOH 44325USA Department of Bioengineering University of Texas at Arlington500 UTA BlvdRoom 240ArlingtonTX 76019USA

Decellularized extracellular matrix(dECM)derived from myocardium has been widely explored as a nature scaffold for cardiac tissue engineering *** dECM offers many unique advantages such as preservation of organ-specific ECM microstructure and composition,demonstration of tissue-mimetic mechanical properties and retention of biochemical cues in favor of subsequent ***,current processes of dECM decellularization and recellularization still face many challenges including the need for balance between cell removal and extracellular matrix preservation,efficient recellularization of dECM for obtaining homogenous cell distribution,tailoring material properties of dECM for enhancing bioactivity and prevascularization of thick *** review summarizes the recent progresses of using dECM scaffold for cardiac repair and discusses its major advantages and challenges for producing biomimetic cardiac patch.

关键词： myocardial infarction decellularized extracellular matrix scaffold cardiac tissue engineering

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德国英语教材价值观呈现研究

外语学刊 2025年第1期 70-77页

作者：葛囡囡北京外国语大学德语学院北京100089

近年来,教材中的价值观呈现愈加受到教材编写者和使用者的关注。本文以德国英语教材On Track为研究对象,探究其价值观呈现的情况。研究发现:在该教材呈现的德国主流价值观中,最常见的价值观类别是社群关系价值观、个人成长价值观、传统... 详细信息

近年来,教材中的价值观呈现愈加受到教材编写者和使用者的关注。本文以德国英语教材On Track为研究对象,探究其价值观呈现的情况。研究发现:在该教材呈现的德国主流价值观中,最常见的价值观类别是社群关系价值观、个人成长价值观、传统文化价值观和发展观念价值观。价值观呈现方式特点有三,即螺旋复现的价值观主题、追求真实的语言中介板块、以思辨能力为导向的素材选择和练习设计。此外,该教材的价值观呈现模态多样。最后,本文针对我国外语教材编写和教材使用如何助力价值观教育提出建议。

关键词：价值观英语教材德国外语教材呈现方式呈现模态