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International Topical Meeting on Advances in Thermal Hydraulics 2018, ATH 2018 - Held in conjunction with the 2018 American Nuclear Society (ANS) Winter Meeting

作者： Song, Guangdong Yang, Qingchuan Qiu, Binbin Yang, Hongyi Yu, Huajin Liu, Mengmeng China Institute of Atomic Energy Beijing102413 China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an710049 China

It is an urgent demand to find an alternative model to replace the actual tube bundles area when using numerical simulation to study the Intermediate Heat Exchanger(IHX) of a Sodium-cooled Fast Reactor. An appropriate alternative model can be a substitute for the actual model of IHX in terms of heat transfer and fluid flow. Dual-mesh coupled heat transfer is used based on the porous media model in FLUENT to simulate the flow field of a simple shell-tube heat exchanger and get temperature, velocity and pressure field data of the primary and the secondary fluid simultaneously. The result meets well with that acquired from the calculation of an actual model which proves that the method in this paper is reliable and is able to reduce the modeling and meshing work. © 2018 International Topical Meeting on Advances in Thermal Hydraulics, ATH 2018 - Embedded Topical Meeting. All rights reserved.

关键词： Mesh generation

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Preparation and Properties of Rice Hull Ash as the catalysis supporter in the fluidized-bed reactor

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IOP Conference Series: Earth and Environmental Science 2021年第1期766卷

作者： Zhaohui Teng Shan Huang Heng Xu Na Li Qulan Zhou College of energy Chengdu University of Tecnoogy Chengdu 610059 China National Key Laboratory of Nuclear Reactor System Design Technology Nuclear Power Institute of China Chengdu 610200 China shenzhen ILNG energy technology CO. LTD Shenzhen 518061 China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

This research focuses on the preparation and properties of rice hull ash(RHA). We prepared RHA from combustion of rice husk in the fluidized-bed reactor. The temperature field of the furnace was steady and bellow 850°C to keep SiO2 amorphous. XRD, BET and SEM were applied in the characterization tests to investigate the effect of flow rate(u), the higher primary-secondary wind ratio(i) and relative height of bed material. The optimal combustion condition for preparing RHA was discussed. RHA obtained from rice hull contains abundant amorphous SiO2 (>90%) and the characterization results of RHA show its potential to be a good catalyst supporter.

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Corrigendum to: “One-pot synthesis of amorphous/crystalline SnO 2 /BaSO 4 composite sensitized with Eosin Y for enhanced photocatalytic H 2 production” [J. Environ. Chem. Eng. 12 (2024) 112770/JECE112770]

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Journal of Environmental Chemical engineering 2024年第5期12卷

作者： Cheng Cheng Jinfeng Zhang Haiping Jia Xutao Ding Gongyue Dong Feng Chen Yuchao Hu Jinwen Shi School of Chemical Engineering and Technology International Research Center for Renewable Energy (IRCRE) State Key Laboratory of Multiphase Flow in Power Engineering (MFPE) Xi’an Jiaotong University (XJTU) 28 West Xianning Road Xi’an 710049 China Shaanxi Key Laboratory of Advanced Stimulation Technology for Oil & Gas Reservoirs Xi’an Shiyou University Xi’an 710065 China Shaanxi Gas Group Fuping Energy Technology Co. Ltd 2 Kaiyuan Road Xi'an 710016 China Integrated Energy Institute Sichuan Digital Economy Industry Development Research Institute 88 Jiefang Road Chengdu 610036 China West Pipeline Company PipeChina 666 Beijing Middle Road Urumqi 830013 China School of Materials and Energy University of Electronic Science and Technology of China Chengdu 611731 China

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Deciphering Ligand Controlled Structural Evolution of Prussian Blue Analogues and Their Electrochemical Activation during Alkaline Water Oxidation

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Angewandte Chemie 2022年第49期134卷

作者： Baghendra Singh Pandian Mannu Yu-Cheng Huang Ravi Prakash Shaohua Shen Chung-Li Dong Arindam Indra Department of Chemistry IIT(BHU) Varanasi UP-221005 India Department of Physics Tamkang University New Taipei City Taiwan School of Material Science and Technology IIT(BHU) Varanasi UP-221005 India International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi An Shi Xi'an 710049 China

Herein, we have demonstrated the control over the structure of precatalysts to tune the properties of the active catalysts and their water oxidation activity. The reaction of K 3 [Fe(CN) 6 ] and Na 2 [Fe(CN) 5 (NO)] with Co(OH) 2 @CC produced precatalysts PC-1 and PC-2, respectively, with distinct structural and electronic features. The replacement of the −CN group with strong π-acceptor −NO modulates the electronic and atomic structure of PC-2. As a result, a facile electrochemical transformation of PC-2 into active catalyst Fe−Co(OH) 2 -Co(O)OH (AC-2) has been attained only in 15 CV cycles while 600 CV cycles are required for the electrochemical activation of PC-1 into AC-1. The X-ray absorption studies reveal the contraction of the Co−O and Fe−O bond in AC-2 because of the presence of a higher amount of Co 3+ and Fe 3+ than in AC-1. The high valent Co 3+ and Fe 3+ modulates the electronic properties of AC-2 and assists in the O−O bond formation, leading to the improved water oxidation activity.

关键词： Electrochemical Reconstruction Oxygen Evolution Reaction Prussian Blue Analogue Ultrathin Nanosheets XAS Studies

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Life cycle assessment of a 1000 MW supercritical pulverized coal power plant under partial loads 31

Life cycle assessment of a 1000 MW supercritical pulverized ...

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31st International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2018

作者： Han, Xiaoqu Chen, Nana Karellas, Sotirios Liu, Ming Liu, Jiping Yan, Junjie Kakaras, Emmanuel State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an China Laboratory of Steam Boilers and Thermal Plants National Technical University of Athens Athens Greece

ISBN: (纸本)9789729959646

With increasing share of renewable energy sources, pulverized coal (PC) power plants have to participate in peak load regulations frequently and operate in partial loads regularly. The energy efficiency and eco-efficiency are both affected significantly in this manner. Therefore, an overall concept for the estimation of environmental impacts from PC plants under nominal and partial loads should be established in life cycle assessment (LCA) methodology. In the present work, a 1000 MW supercritical coal-fired unit, which is the main force for power supply in China, was modeled using commercial simulation tools (GSE and SimaPro). The aim is to investigate the environmental impacts under different working conditions from the perspective of LCA. Moreover, a partial load feedwater heating system with ejector in a coal-fired power unit was proposed and investigated. Model validation and LCA analysis under nominal load show that GWP and PCOP are the main environmental impacts of PC plants. But AP and EP are also serious concerns. Under partial loads, the AP and EP increase significantly, resulted from the reduction in NOx removal efficiency. It is thereby concluded that the mechanisms of formation, migration, and removal of different kinds of pollutant emissions influence the LCA results significantly. Therefore, operation optimization was carried out based on the guidelines of the LCA framework, to reduce the environmental impacts of PC power plants under partial loads. It is indicated that through the integration of an ejector, the NOx removal efficiency at extremely low load (30%) can be maintained at a high level. The environment impact potentials can thus be reduced effectively. © 2018 University of Minho. All rights reserved.

关键词： Emission control

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Adsorption and Diffusion of Gas Molecules on Graphite Surface

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2018年第1期39卷 110-113页

作者： Sun, Cheng-Zhen Bai, Bo-Feng State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

The adsorption and diffusion characteristics of gas molecules on graphite surface are investigated by molecular dynamics simulations. The results show that the adsorption intensity of gas molecules on graphite surface is related to the atomic interactions between gas molecules and carbon atoms in graphite;different gas molecules present distinct adsorption intensities on graphite surface. The adsorption characteristics can be described by the Langmuir isothermal adsorption model, where the molecular number density in the adsorption layer increases with increasing gas pressure. From the decreasing diffusion coefficients with increasing gas pressure and the normal probability distribution of molecular moving distance in a certain time period, it is concluded that the gas diffusion on graphite surface is mainly controlled by the molecular collisions and approaches the bulk diffusion phenomenon. Accordingly, the molecular number density in the adsorption layer has a great effect on the surface diffusion coefficients, resulting in the obviously lower diffusion coefficients of CO2 and H2S molecules with stronger adsorption intensities than those of CH4 and N2 molecules with weaker adsorption intensities. © 2018, Science Press. All right reserved.

关键词： Adsorption

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Rapid Prediction Models for Oil Temperature and Surrounding Environment Temperature Fields in Buried Hot Crude Oil Pipelines

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Journal of Pipeline Systems engineering and Practice 2025年第3期16卷

作者： Yan, Feng Xu, Jingyan Li, Qifu Zhou, Chaoqun Ji, Mingyang Gong, Junhua Xiang, Yue Chen, Yujie Han, Dongxu Wang, Peng Dept. of Storage and Transportation Technology Research PipeChina Research Institute of Science and Technology 4 Dongting 1st Rd. Binhai New Area Tianjin300450 China Project Management Center of Production and Operation Dept Northeast Company of PipeChina Hunnan District Liaoning Province Shenyang110000 China Dept. of Production and Operation Changqing Oil and Gas Transportation Branch of Northwest Company of PipeChina Xingqing District Yinchuan Ningxia750004 China School of Mechanical Engineering Beijing Institute of Petrochemical Technology Beijing102617 China State Key Laboratory of Multiphase Flow in Power Engineering Xi'An Jiaotong Univ Xi'an710049 China Dept. of Digital Twin for Energy and Power Systems Sichuan Energy Internet Research Institute Tsinghua Univ Sichuan610213 China

Wax-rich or high-viscosity crude oil requires heating for long-distance transportation in buried pipelines. Monitoring the temperature distributions and variations of both oil and surrounding environment is crucial to ensuring safety and economic efficiency. This study proposes two models for rapidly predicting the steady-state oil temperature and surrounding environment temperature fields based on the Fourier neural operator (FNO) network and U-shaped network (UNet), respectively. These models leverage numerical results as training data, incorporating boundary conditions and environment grid coordinates at the pipeline cross section as inputs to predict the temperature distributions of both oil and the surrounding environment along the buried pipeline. With optimized hyperparameters, the models achieve accurate and efficient predictions. The FNO and UNet models had average RMS errors (RMSEs) in environment temperature field prediction of 2.68×10-3 and 5.49×10-3 at the pipeline cross section, respectively. For oil temperature predictions, the FNO model had an average relative error of 1.49×10-4, compared with 2.55×10-4 for the UNet model, with average absolute error values of 5.32×10-3 and 7.24×10-3, respectively. Moreover, both models exhibited strong generalization, with an average RMSE in the environment temperature field prediction of less than 3.5×10-2 and an average relative error in oil temperature predictions of less than 2.1×10-3 across different data sets. Comparatively, the FNO and UNet model had slightly higher prediction accuracy than the UNet model. In terms of computational efficiency for a 100-km pipeline, these models offer improvements of at least 116.25× over the numerical simulation method, with a maximum improvement of 1,775.03× as the number of simultaneously predicted pipeline cross sections increases. © 2025 American Society of Civil Engineers.

关键词： flowlines

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A simple green approach to synthesis of sub-100 nm carbon spheres as template for TiO_2 hollow nanospheres with enhanced photocatalytic activities

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Science China Materials 2018年第6期61卷 869-877页

作者： Yubo Tan1 Maochang Liu1 Daixing Wei1 Heming Tang2 Xinjian Feng2 Shaohua Shen1 International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University College of Chemistry Chemical Engineering and Materials Science Soochow University

Carbon spheres（CSs） have attracted great attention given their wide applications in bio-diagnostics, photonic band-gap crystals and drug delivery, etc. The morphology and size of CSs greatly affect their performances and applications. Herein, we report a green and catalyst-free hydrothermal carbonization（HTC） method to synthesize CSs with glucose as carbon precursor. The diameter of CSs can be tuned within a wide range from 450 to 40 nm by controlling the glucose concentration, reaction time and *** the obtained CSs as template, hollow TiO2 nanospheres（HTNSs） with controllable diameters are prepared via a sol-gel method. As photocatalysts for hydrogen generation, the photoactivity of the HTNSs shows strong dependence upon size,and is much higher than that of solid TiO2. With particle size decreasing, the photoactivity of the obtained HTNSs gradually increases. Without any co-catalyst, the highest photocatalytic hydrogen generation activity is obtained with HTNSs of 40 nm in diameter, which exceeds that of solid TiO2 and commercial P25 by 64 times and 3 times, respectively.

关键词： carbon nanospheres hydrothermal carbonization hollow titanium dioxide nanospheres photocatalytic hydrogen production

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Numerical Study on flow Field in a Diameter-Varying Spray Tower for Amine-Based CO2 Absorption

SSRN

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SSRN 2019年

作者： Wu, Xiaomei Yu, Yunsong Zhang, Zaoxiao Wang, Geoff Rudolph, Victor School of Chemical Engineering and Technology Xi’an Jiaotong University No.28 Xianning West Road Xi’an710049 China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an710049 China

关键词： Greenhouse gases

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Performance of CO_2 absorption in a diameter-varying spray tower

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Chinese Journal of Chemical engineering 2017年第8期25卷 1109-1114页

作者： Xiaomei Wu Yunsong Yu Zhen Qin Zaoxiao Zhang School of Chemical Engineering and Technology Xi'an Jiaotong University State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University

The application of spray towers for CO2 capture is a development trend in recent years. However, most of the previous jobs were conducted in a cylindrical tower by using a single spray nozzle, whose configuration and performance is not good enough for industrial application. To solve this problem, the present work proposed a diameter-varying spray tower and a new spray mode of dual-nozzle opposed impinging spray to enhance the heat and mass transfer of CO2 absorption process. Experiments were performed to investigate the mass transfer performance （in terms of the CO2 removal rate （η） and the overall mass transfer coefficient （KGae）） of the improved spray tower under various operating conditions. Experimental results showed that the liquid to gas ratio and mole ratio of MEA to C02 are major factors, which affect the absorption performance and the maximums of η and KGae that are 94.0% and 0.574 kmol. m^-3·h^-1·kPa^-1, respectively, under the experimental conditions. Furthermore, new correlations to predict the mass transfer coefficient of the proposed spray tower are developed in various CO2 concentrations with a Pearson Correlation Coefficient over 90%.

关键词： Carbon dioxide Absorption Diameter-varying spray tower Mass transfer

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