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2024 31st International Conference on Nuclear engineering, ICONE 2024

作者： Bouloudenine, Aimad Li, Liangxing Xiang, Zutao Shi, Shang Bakar, Muhammad Abu Xi’an Jiaotong University State Key Laboratory of Multiphase Flow in Power Engineering Xianning West Road 28 Xi’an City710049 China

ISBN: (纸本)9780791888292

This study investigates the coolability of debris beds formed from Fuel-Coolant Interactions (FCI) within nuclear reactors, a critical safety concern when cooling systems fail, leading to significant core melting in light-water reactors. The research focuses on understanding the flow dynamics within two-layer stratified porous beds, which develop from the mixture of corium and coolant, particularly around the interface between layers. Using ANSYS Fluent software, numerical simulations were conducted to estimate velocity profiles and pressure drops across a stratified porous structure. The Euler-Euler two-fluid model was employed alongside the k-ω-based Shear Stress Transport (SST) turbulence model to separately model turbulence for each phase. The results reveal that lateral flow dynamics are significant as fluids traverse through the porous media, affecting pressure drops across layers with varying permeabilities. Specifically, the pressure drops across the lower-permeability layer decrease while that across the higher-permeability layer increases, highlighting the influence of lateral flows between layers of different particle sizes due to variations in porosity. This lateral flow is most likely formed during the initial stages of fluid movement through the bed. The study underscores the importance of understanding these flow characteristics for both single/two-phase flow to enhance the safety and design of nuclear reactors by improving debris bed coolability predictions. Copyright © 2024 by ASME.

关键词： Computational fluid dynamics

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Heat and power Load Prediction for Combined Heat and power Station with Different Methods 4

Heat and Power Load Prediction for Combined Heat and Power S...

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4th IEEE International Conference on Digital Twins and Parallel Intelligence, DTPI 2024

作者： Wang, Lin Yu, Tingting Chen, Chen Gao, Yaokui Gao, Lin Qiu, Binbin Liu, Ming Xi'an Thermal Power Research Institute Co. Ltd Xi'an China Xi'an Jiaotong University State Key Laboratory of Multiphase Flow in Power Engineering Xi'an China

ISBN: (纸本)9798350349252

The accurate short-term load prediction is an essential prerequisite for ensuring the reliable and economic operation of combined heat and power stations. In this study, the heat load and power load prediction models of combined heat and power station were developed with long short-term memory (LSTM) and multiple linear regression (MLR), respectively. The preprocessing and correlation analysis of heat and power loads were conducted. The prediction effects of different prediction models were also compared and analyzed. Taking the data of February as an example, the mean absolute percentage error (MAPE) of heat load prediction with LSTM and MLR models are 3.20% and 3.75%, respectively, and the MAPE of power load prediction are 5.59% and 8.76%, respectively. The prediction results show that the performance of the LSTM model is better than that of the MLR model, and the prediction accuracy of the heat load is higher than that of the power load. © 2024 IEEE.

关键词： Prediction models

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Resource utilization of solid waste carbide slag:a brief review of application technologies in various scenes

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Waste Disposal and Sustainable Energy 2022年第1期4卷 1-16页

作者： Hongxia Wang Wanyi Xu Maimoona Sharif Guangxu Cheng Zaoxiao Zhang State Key Laboratory of Multiphase Flow in Power Engineering School of Chemical Engineering and TechnologyXi’an Jiaotong UniversityXi’an 710049ShaanxiChina

China is the largest producer and consumer of calcium carbide in the *** calcium carbide industry is an indispensable industry to support the basic life of *** huge production capacity of calcium carbide is accompanied by a large number of solid waste carbide *** to the immature treatment technology of carbide slag,a large number of carbide slag are stacked on-site,resulting in land occupation,air-drying,easy take-off ash,and pollution of the environment and water *** China,calcium carbide is mainly used to produce acetylene and further utilized,80%of which is used to produce polyvinyl chloride(PVC).A large amount of carbide slag is not used,while only a small part is used in the traditional building materials industry,flue gas desulfurization,sewage treatment,etc.,however,the economic benefits are ***,converting the solid waste carbide slag produced by the calcium carbide industry into high value-added CaCO3,CaCl2,CaSO4 whiskers,*** become a potential way to expand the development field of the calcium carbide industry and is environmentally *** paper focuses on summarizing the traditional and emerging high value-added utiliza-tion technologies of carbide slag,and then introduces the application research of carbide slag in carbon emission ***,the defects of these technologies are summarized and further research directions are *** study provides basic guidance for the diversified development of efficient resource utilization of carbide *** abstract Diversified development of calcium carbide industry,resource utilization of solid waste carbide slag and its application of carbon emission reduction have been fully reviewed.

关键词： Calcium carbide Carbide slag Application research High added value Carbon emission reduction

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Simulation of the dynamic behavior of droplet impact on the microstructure surface 1

Simulation of the dynamic behavior of droplet impact on the ...

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1st International Conference on Fluid Dynamics and Computational Science, FDCS 2022

作者： Yang, Jianhua Gao, Ming Sun, Hailin Liu, Zhennan Zhang, Kaiyuan Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering School of Energy and Power Engineering The University of Shanghai for Science and Technology Shanghai200093 China

The problem of droplets impacting rough wall has always been a hot spot in the engineering field. In this paper, the single-component multiphase lattice Boltzmann method is used to construct the wall microstructure, and the dynamic behavior characteristics of droplets impacting rough walls are simulated. The results show that the final state of a droplet impacting rectangular microstructure shows that the hydrophilic surface is more hydrophilic and the hydrophobic surface is more hydrophobic, and compared with the smooth surface, the microstructure surface hinders the rebound of the droplet, and the application of microstructure on the wall can promote the spreading of a droplet on the wall. © 2023 Institute of Physics Publishing. All rights reserved.

关键词： Drops

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On the spreading behavior of a droplet on a circular cylinder using the lattice Boltzmann method

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Chinese Physics B 2024年第6期33卷 434-443页

作者：杨帆金虎戴梦瑶 School of Energy and Power Engineering University of Shanghai for Science and TechnologyShanghai 200093China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering Shanghai 200093China

The study of a droplet spreading on a circular cylinder under gravity was carried out using the pseudo-potential lattice Boltzmann high-density ratios multiphase model with a non-ideal Peng–Robinson equation of state. The calculation results indicate that the motion of the droplet on the cylinder can be divided into three stages: spreading, sliding, and *** contact length and contact time of a droplet on a cylindrical surface can be affected by factors such as the wettability gradient of the cylindrical wall, the Bond number, and droplet size. Furthermore, phase diagrams showing the relationship between Bond number, cylinder wall wettability gradient, and contact time as well as maximum contact length for three different droplet sizes are given. A theoretical foundation for additional research into the heat and mass transfer process between the droplet and the cylinder can be established by comprehending the variable rules of maximum contact length and contact time.

关键词： lattice Boltzmann methods droplet circular cylinder wettability gradient

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Photochemical Systems for Solar‑to‑Fuel Production

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Electrochemical Energy Reviews 2022年第3期5卷 137-177页

作者： Ya Liu Feng Wang Zihao Jiao Shengjie Bai Haoran Qiu Liejin Guo International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi’an Jiaotong UniversityXi’an 710049ShaanxiChina

The photochemical system,which utilizes only solar energy and H_(2)O/CO_(2) to produce hydrogen/carbon-based fuels,is considered a promising approach to reduce CO_(2) emissions and achieve the goal of carbon *** date,numerous photochemical systems have been developed to obtain a viable solar-to-fuel production system with sufficient energy ***,more effort is still needed to meet the requirements of industrial *** this review,we systematically discuss a typical photochemical system for solar-to-fuel production,from classical theories and fundamental mechanisms to raw material selection,reaction condition optimization,and unit device/system advancement,from the viewpoint of ordered energy ***-of-the-art photochemical systems,including photocatalytic,photovoltaic-electrochemical,photoelectrochemical,solar thermochemical,and other emerging systems,are *** highlight the existing bottlenecks and discuss the developing trend of this ***,optimization strategies and new opportunities are proposed to enhance photochemical systems with higher energy efficiency.

关键词： Solar energy Photochemical Hydrogen Carbon-based fuels

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Numerical investigation on the scale-up and optimization of coal-supercritical water fluidized bed gasification reactors for hydrogen production

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International Journal of Hydrogen Energy 2025年 144卷 112-123页

作者： Zhenqun Wu Guobiao Ou Hui Jin State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University China

The supercritical water fluidized bed (SCWFB) is an ideal reactor for the industrial application of the technology of coal gasification in supercritical water (SCW) for hydrogen production. To address the lack of scale-up theory for SCWFB reactors, this study develops a new coal-SCW particulate flow reaction model and performs systematic numerical investigations on the effects of reactor size scale-up (2-, 5-, and 10-fold) and operating parameters scale-up. Results demonstrate that as the reactor size increases, the high-quality fluidization characteristic of SCWFB get maintained, while coal gasification efficiency (CE) gets enhanced. At the 10-fold scale-up level, CE increases by more than 4 % compared to the original reactor, and efficient gasification can be achieved for high-concentration coal slurries (60 wt %) with the CE of 93.98 %. Moreover, through optimization of feedstock injection velocity and multi-nozzle configurations, the temperature distribution homogeneity and CE get further enhancement in scaled-up SCWFB reactors.

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Assisting effect of Al_(2)O_(3) on MnO_(x) for NO catalytic oxidation

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Green Energy & Environment 2021年第6期6卷 903-909页

作者： Denghui Wang Hui Li Qi Yao Shien Hui Yanqing Niu State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power EngineeringXi'an Jiaotong UniversityXi'an710049China

Various Mn-based catalysts for NO oxidation were prepared using MnO_(x)as active compound,while Ti O_(2)and Al_(2)O_(3)were adopted as catalyst *** performance of the catalysts was tested to study the effect of support on Mn-based catalyst *** of the catalysts followed as Mn_(0.4)/Al>Mn_(0.2)/Al>Mn_(0.4)/Ti>Mn_(0.2)/Ti>MnO_(x)>Al_(2)O_(3)on the whole,indicating the synergism of MnO_(x)and Al_(2)O_(3)for NO catalytic *** were analyzed according to characterization *** oxygen on catalyst rather than lattice oxygen was detected as the active oxidizer for NO *** catalyst support,Al_(2)O_(3)provided more sites to carry surface adsorbed oxygen than TiO_(2),resulting in the presence of more active oxygen on Mn O_(x)/Al_(2)O_(3)than on MnO_(x)/TiO_(2).Moreover,MnO_(x)/Al_(2)O_(3)possessed high surface area and pore volume,which greatly benefited the adsorption of NO on catalyst and further favored the oxidation of NO by active *** these advantages helped Mn_(0.4)/Al exhibited the best catalytic efficiency.

关键词： NO catalytic oxidation MnO_(x)/Al_(2)O_(3) NO_(2) Active oxygen

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Concurrently Boosting Activity and Stability of Oxygen Reduction Reaction Catalysts via Judiciously Crafting Fe-Mn Dual Atoms for Fuel Cells

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Nano-Micro Letters 2025年第4期17卷 275-289页

作者： Lei Zhang Yuchen Dong Lubing Li Yuchuan Shi Yan Zhang Liting Wei Chung-Li Dong Zhiqun Lin Jinzhan Su International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi’an Jiaotong UniversityXi’an 710049People’s Republic of China Department of Physics Tamkang UniversityNew Taipei CityTaiwan 25137People’s Republic of China Department of Chemical and Biomolecular Engineering National University of SingaporeEngineering Drive 4Singapore 117585Singapore

The ability to unlock the interplay between the activity and stability of oxygen reduction reaction(ORR)represents an important endeavor toward creating robust ORR catalysts for efficient fuel ***,we report an effective strategy to concurrent enhance the activity and stability of ORR catalysts via constructing atomically dispersed Fe-Mn dualmetal sites on N-doped carbon(denoted(FeMn-DA)-N-C)for both anion-exchange membrane fuel cells(AEMFC)and proton exchange membrane fuel cells(PEMFC).The(FeMn-DA)-N-C catalysts possess ample dual-metal atoms consisting of adjacent Fe-N_(4)and Mn-N_(4)sites on the carbon surface,yielded via a facile doping-adsorption-pyrolysis *** introduction of Mn carries several advantageous attributes:increasing the number of active sites,effectively anchoring Fe due to effective electron transfer to Mn(revealed by X-ray absorption spectroscopy and density-functional theory(DFT),thus preventing the aggregation of Fe),and effectively circumventing the occurrence of Fenton reaction,thus reducing the consumption of ***(FeMn-DA)-N-C catalysts showcase half-wave potentials of 0.92 and 0.82 V in 0.1 M KOH and 0.1 M HClO_(4),respectively,as well as outstanding *** manifested by DFT calculations,the introduction of Mn affects the electronic structure of Fe,down-shifts the d-band Fe active center,accelerates the desorption of OH groups,and creates higher limiting *** AEMFC and PEMFC with(FeMn-DA)-N-C as the cathode catalyst display high power densities of 1060 and 746 mW cm^(-2),respectively,underscoring their promising potential for practical *** study highlights the robustness of designing Fe-containing dual-atom ORR catalysts to promote both activity and stability for energy conversion and storage materials and devices.

关键词： Doping-adsorption-pyrolysis Dual-atom catalysts Oxygen reduction reaction Fuel cells

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CAPACITY OPTIMIZATION OF ADVANCED ENERGY STORAGE TECHNOLOGIES FOR PEAK SHAVING AND FREQUENCY REGULATION BASED ON ECONOMIC AND CARBON-MITIGATION CO-BENEFIT 37

CAPACITY OPTIMIZATION OF ADVANCED ENERGY STORAGE TECHNOLOGIE...

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37th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2024

作者： Nie, Lu Li, Yanxin Gan, You Han, Xiaoqu Wang, Tong Yan, Junjie State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China Huadian Electric Power Research Institute Co. Ltd. Beijing China

ISBN: (纸本)9798331307660

With the rapid scale-up in popularity of renewable energy sources, the new power system is suffering from enhanced *** order to improve flexibility of new power system and mitigate carbon emission, the integration of thermal power plants with energy storage technologies (ESTs) has gradually become a promising *** a key support for the development of new power system, it is of great significance to investigate the capacity optimization of advanced ***, there was a lack of study related to the capacity optimization of ESTs and the combination revenue patterns of ESTs were seldom *** the present work, a capacity optimization model was established for ESTs operating in combination with thermal power plants on the generating side, including lithium iron phosphate battery (LIPB), vanadium redox flow battery (VRFB), compressed air energy storage (CAES), supercapacitors (SC), and flywheel (FE) with the goal of maximizing the ***, VRFB, and CAES energy storage systems were investigated in the peak shaving (PS) *** co-benefit of ESTs was significant, 30.7-43.2 $/MWh, internal rate of return (IRR) was 12%-20%, and payback period (PP) was 6-11 years when the ratio of ESTs allocation (EAR) for thermal power plants was 2.50%-5.52%.LIPB, VRFB, CAES, SC, and FE were investigated in the frequency regulation (FR) *** co-benefit of ESTs was 51.9-329.3 $/MWh, IRR was 20%-35%, and PP was 3-7 years when the EAR was 0.24%-5.65%.The contribution of carbon mitigation benefit to co-benefit for different ESTs varied substantially, ranging from 6.46% to 82.75%.The ESTs not only offered ancillary service, but also other services when it operated as an independent shared energy storage.A new combination revenue pattern was proposed, under which revenue increased by 35%-55% compared to that of existing *** analysis was performed, in which the cost of energy storage, carbon tax, peak-valley spread, and comprehensi

关键词： flow batteries

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