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6th International Conference on Optoelectronic science and Materials, ICOSM 2024

作者： Ma, Xinguo Liu, Zhiwen Guo, Youyou Ren, Yijing State Key Laboratory of Advanced Technology for Float Glass Bengbu Glass Industrial Design and Research Institute Bengbu233030 China School of Science Hubei University of Technology Wuhan430068 China Hubei Engineering Technology Research Center of Energy Photoelectric Device and System Hubei University of Technology Wuhan430068 China

ISBN: (数字)9781510686823

ISBN: (纸本)9781510686816

The study on the properties of barium carbonate in different crystal systems is play an important role for the evolution of electronic products requiring miniaturization and high performance. Here, the electrical and optical properties of BaTiO3 crystal structures with three space groups (Pm 3 m, P4mm, and P4/mmm) were systematically studied using the first-principles method. The structural are confirmed to be stable by the Born criterion The evolution energy band structures under HSE06 functional were more consistent with other theoretical and experimental results compared to the PBE functional. The band gaps of BaTiO3 for Pm 3 m, P4mm, and P4/mmm space groups up to 3.42, 3.24, and 3.26 eV and exhibit indirect semiconductor behavior. The optical parameters show that the light absorption rate and loss function of all three BaTiO3 were almost zero in the lower energy range. However, the tetragonal phase BaTiO3 with P4/mmm space group has a lower light reflection rate and higher light refractive index compared to the tetragonal phase BaTiO3 with P4/mmm and the cubic phase BaTiO3 with Pm 3 m space group, indicating its potential application value in electro-optic modulation. © 2024 SPIE.

关键词： Refractive index

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Application of feedforward predictive control in DC furnace coordination system

Application of feedforward predictive control in DC furnace ...

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2020 International Symposium on Automation, Mechanical and design Engineering, SAMDE 2020

作者： Deng, Zhiguang Zhengxi, H.E. Biwei, Z.H.U. Jialiang, Z.H.U. Xin, L.V. Qian, W.U. National Key Labortory of Science and Technology on Reactor System Design Technology Chengdu610213 China

In order to solve the control difficulties such as large dynamic delay, serious coupling between machine and furnace and strong nonlinear, the feedforward and feedback predictive control is proposed to control the coordinated system on the basis of multi-model predictive control, and the static feedforward part designs the feed line feedforward of coal quantity against coal quality disturbance on the basis of the accurate balance of energy. Thus, the reference total fuel quantity under the target load instruction is determined, and the dynamic part fully considers the dynamic compensation of the unit energy storage, gives a certain overshoot fuel quantity to the boiler regulation, speeds up its response, and ensures the rapidity of the unit. The real-time simulation results of virtual DPU (Distributed Processing Unit) show that the designed feedforward-feedback predictive control can quickly respond to load change, improve the resistance to fuel disturbance, reduce the fluctuation of main steam pressure, and better ensure the safe, economic and stable operation of the coordination system. © Published under licence by IOP Publishing Ltd.

关键词： Feedback

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Research on Fine Modeling of Dispersion Fuel Plate Based on Lattice Method

SSRN

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SSRN 2023年

作者： Chen, Yuqing Liu, Pengfei Li, Song Lou, Lei Li, Ang College of Nuclear Science and Technology Naval University of Engineering Wuhan China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu China

For Double Heterogeneous(DH) systems, the analysis shows that the lattice modeling method has a great advantage in efficiency compared to the stochastic explicit modeling method, but the Lattice Modeling Method with Single-Particle Universe(LMMSU) has difficulties in calculating the problem of DH system with multiple particle sizes. In this paper, a Lattice Modeling Method with Multiple -Particles Universe(LMMMU) is proposed . The LMMMU has a computational error of less than 30 pcm when dealing with particle-dispersed fuel systems and still less than 50 pcm when dealing with particle-dispersed burnable poison systems. The memory footprint is reduced to 5.21% and the computation time is reduced to 1.25% compared to the stochastic explicit modeling method. The LMMMU also shows good compatibility when dealing with the problem of filling by two types of dispersed particles. Comprehensive analysis shows that the LMMMU is better than LMMSU in terms of applicability, efficiency, and accuracy. © 2023, The Authors. All rights reserved.

关键词： Efficiency

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Effect of Fission Defects on Tensile Strength of U3si2 Σ5(210) Grain Boundary from First-Principles Calculations

SSRN

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SSRN 2023年

作者： Zhao, Jiajun Sun, Dan Xi, Liu Chen, Ping Zhao, Jijun Wang, Yuanyuan Dalian University of Technology Liaoning Dalian China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Sichuan Chengdu China

U3Si2 is regarded as a promising accident tolerant fuel (ATF) to replace the commercial fuel UO2;however, U3Si2 grain boundary (GB) embrittlement caused by irradiation-induced defect segregation remains to be clarified. In this work, U3Si2 Σ5(210) symmetrically tilt GB is taken as representative to elucidate the individual effect of xenon (Xe) and vacancy on the tensile strength and failure of GB using first-principles calculations. Compared with the predicted segregation energies of defects at the most energetically favourable positions of GB, Si vacancy (VSi) has much stronger preference to segregate to GB than that of Xe substitution on Si sublattice (XeSi). Moreover, the strengthening/embrittlement potency of GB with single vacancy/Xe is evaluated using the first-principles-based uniaxial tensile test. Although both VSi and XeSi yield a weakening effect on the strength of U3Si2 Σ5(210) GB, such defective GBs exhibit significantly stronger interface strengths compared to the corresponding defects segregated to UO2 Σ3(111) GB. The underlying mechanism of strength change of U3Si2 GB is discussed in terms of charge analysis. Our results can provide fundamental understanding on the mechanical behavior of irradiated GB from an atomic perspective. © 2023, The Authors. All rights reserved.

关键词： Grain boundaries

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Study on hydrogen stratification and erosion process in Chinese SMR containment under severe accident scenario

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International Journal of Advanced Nuclear reactor design and technology 2020年 2卷 43-51页

作者： Fan, Yang Songwei, Li Wei, Zeng Zhifang, Qiu Jian, Deng Science and Technology on Reactor System Design Technology Laboratory NPIC China Design and Research Sub-institute NPIC China

During postulated severe accident, large amount of hydrogen-vapor mixture will be released into the containment and inflammable gas mixture may form. Once the gas will be ignited, the generated pressure loads can jeopardize the integrity of the internal structures. As the local accumulation of high content hydrogen related much to the stratification and erosion mechanism, it is therefore of interest whether a stratification of gas layers will form within small containment. In this study, a stratification/erosion experiment is performed and the criteria under which the steady stratification will be destroyed by steam jet discussed. Then the simulation method is validated by the experimental data. At last, several severe accident scenarios for Chinese SMR performed and one of them is adopted for containment hydrogen CFD analysis. It is shown that high content of hydrogen will form in the upper part of the containment, and clear gas stratification will form, such stratification will be enhanced due to the condensation effect of steel containment wall. © 2020

关键词： Hydrogen

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Fuel Flow Modeling under Thermal Fluidics Considerations within Operational Domains of Molten Salt reactors 20

Fuel Flow Modeling under Thermal Fluidics Considerations wit...

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20th International Topical Meeting on Nuclear reactor Thermal Hydraulics, NURETH 2023

作者： Abuqudaira, Thabit M. Tsvetkov, Pavel V. Sabharwall, Piyush Department of Nuclear Engineering Texas A&M University College StationTX77843 United States Advanced Reactor Technology and Design Nuclear Science & Technology Idaho National Laboratory Idaho FallsID83415 United States

ISBN: (纸本)9780894487934

Molten Salt reactors (MSRs) offer significant versatility supported by their design flexibility and safety advantages due to high temperatures, design customization capabilities, strong negative reactivity feedback effects, and salt chemistry *** control schedules and different mass flow rates in the MSR primary systems impact neutronics and thermal hydraulics *** result is ***, it leads to adaptability in various applications when the customization of a MSR unit is ***, it calls for the quantification of dynamics and safety characteristics to assess the operational domain and make sure reactor stability and inherent safety characteristics are *** paper provides an in-depth transient analysis of the operational implications of MSRs having heat-generating fuel and heat-transporting salt mixed forming liquid fuel salts contained within primary systems.A coupling model was developed to simulate fuel flow in molten salt reactors.A zero-dimensional reactor kinetics model was used with a one-dimensional heat transfer model in the reactor *** temperature reactivity feedbacks of the fuel salt resulting from the thermal-hydraulics model were used in the reactor kinetics model to complete the coupled *** model was first validated with the experimental results from the Molten Salt reactor Experiment (MSRE).Then, it was applied to simulate the Molten Salt Breeder reactor (MSBR) response at steady state and *** developed model was shown to be a suitable tool for the dynamic analysis of molten salt reactors. © 2023 Proceedings of the 20th International Topical Meeting on Nuclear reactor Thermal Hydraulics, NURETH 2023. All rights reserved.

关键词： Molten salt reactor

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Optimized Moderator design and Analysis of a Pin-Type Supercritical Carbon Dioxide reactor Based on RMC 29

Optimized Moderator Design and Analysis of a Pin-Type Superc...

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2022 29th International Conference on Nuclear Engineering, ICONE 2022

作者： Zhao, Xingyu Liu, Minyun Cui, Rongyi Huang, Shanfang Wang, Kan Lu, Chuan Department of Engineering Physics Tsinghua University Beijing China Cnnc Key Laboratory on Nuclear Reactor Thermal Hydraulics Technology Nuclear Power Institute of China Chengdu China China Nuclear Power Engineering Co. Ltd Beijing China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu China

ISBN: (纸本)9780791886502

This study analyzed an yttrium hydride (YH2) moderated supercritical carbon dioxide cooled reactor loaded with pin-type, beryllium oxide diluted oxide fuel elements to reduce the critical enrichment. The impact of the YH2 on the coolant void reactivity was studied along with a moderator zoning scheme to flatten the radial power distribution. The YH2 was added as hexagonal moderating rods at the center of the fuel assemblies. The core was modeled using the continuous-energy reactor Monte Carlo code, RMC, with the On-The-Fly cross sections treatment. The results showed that the YH2 moderator increased the thermal fission and reduced the critical enrichment of the core with the same diluent volume fraction by more than 30%. The YH2 moderator significantly softened the neutron energy spectrum and reduced the neutron leakage upon core voiding, resulting in both a weaker positive spectral reactivity feedback and a weaker negative leakage reactivity feedback during core depressurization. For an UO2-loaded core, the YH2 gave a lower negative coolant void reactivity, while for a MOX-loaded core with diluent volume fractions smaller than 35%, the spectral feedback was more important and the YH2 strongly reduced the positive coolant void reactivity to less than $1. Arranging the YH2 in the peripheral assemblies reduced the radial power peaking factor to 1.319. The study shows that the YH2 moderator can reduce the critical enrichment, make the core less sensitive to voiding, and can flatten the radial power distribution of a single-enrichment core through moderator zoning. © 2022 by ASME.

关键词： Carbon dioxide

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The Power Control Method of Data Center Based on Cloud- Edge Collaboration 3

The Power Control Method of Data Center Based on Cloud- Edge...

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2020 3rd International Symposium on Power Electronics and Control Engineering, ISPECE 2020

作者： Zhao, Junjie Hou, Yucheng Liu, Liu Xie, Feng Mao, Xiang Luo, Pan Wang, Jinxin Zhang, Zhiqiang Deng, Jiang Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China Tianjin300072 China

Data centers have the characteristics of huge energy consumption and strong power fluctuations. To solve the problem of unstable supply and demand such as frequent power fluctuations in the micro-grid of the data center using renewable energies, this paper establishes a controllable load model of server clusters based on the task migration mechanism by analyzing the various tasks and characteristics of large cloud data centers, as well as edge computing nodes. Through the collaborative optimization control of edge and cloud computing tasks, and dynamically adjusting and migrating the server cluster load, a new data center tie-line power control method is proposed. The results of calculation examples show that the method can achieve power smoothing of large-scale cloud data center tie lines through cloud-edge collaborative control. © Published under licence by IOP Publishing Ltd.

关键词： Power control

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The Influence of Suspension and Deposition on Pool Boiling Heat Transfer of Nanofluids: Experiment and Engineering Model Study

SSRN

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SSRN 2024年

作者： Peng, Cheng Song, Youya Deng, Jian Wu, Jiang Chen, Helin Liu, Fang College of Energy and Mechanical Engineering Shanghai University of Electric Power Shanghai China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu China

Applications including heat exchangers, high power electronic components, and nuclear reactors now require heat transfer technologies that can achieve both high efficiency and compact footprints. Because nanofluids have advantageous heat transfer properties, they have a greater potential to replace conventional coolants. However, predicting nanofluid boiling heat transfer is still difficult. In order to compare the coupled effects of suspended and deposited nanoparticles with the single effect of deposited nanoparticles, the researchers conducted boiling heat transfer experiments. The findings demonstrated that suspended nanoparticles made the surface less wettable, while the deposited nanoparticles increased the wettability. The number of active nucleate sites and the frequency of bubble detachment increase due to the suspension and deposition of nanoparticles, whereas the diameter of the bubble decreases. Based on the experimental data, predictive models for boiling heat transfer and bubble behavior were proposed, with a range of mass concentrations from 0.001% to 0.005% and heat flux between 60 and 130 kW/m2. Less than 30% was found to be the error margin between the experimental data and the predictive equations. It was discovered that the influence of deposited nanoparticles on boiling heat transfer was usually dominant, according to the predictions made by the proposed theoretical models. © 2024, The Authors. All rights reserved.

关键词： Deposition

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Experimental study on aerosol behavior in water pool scrubbing under severe accident conditions

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International Journal of Advanced Nuclear reactor design and technology 2020年 2卷 111-116页

作者： Xu, Youyou Deng, Jian Zou, Zhiqiang Jiang, Guangming Wu, Xiaoli Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu China

In severe accident of nuclear power plant, large quantities of steam and radioactive aerosol may release to the containment. Meanwhile, hydrogen may be generated by zirconium-steam reaction and released to the containment and mixed with steam and air to form a flammable mixture (H2, H2O, Air) which might combust even explode to generate mechanical and thermal load on containment. In this situation, timely containment venting strategies (CVS) is an important and effective measure to release the containment atmosphere to decrease the pressure. In order to remove the radioactive aerosol particles and cool the high temperature mixture, the containment atmosphere are vented to the water pool. This paper mainly investigated the behavior of aerosol scrubbing in water pool. The effects of submergence depth, aerosol particle diameter and aerosol concentration were preliminary studied by conducting a series of experiments. The results illustrate that the scrubbing efficiency of gas jet injection into water pool almost larger than 90%. And the aerosol particle diameter and submergence depth have significant influence on decontamination factor (DF). This paper provide data basis and reference to the subsequent work. © 2020

关键词： Aerosols

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