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Remote open-path laser-induced breakdown spectroscopy for the analysis of manganese in steel samples at high temperature

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Plasma Science and Technology 2019年第3期21卷 52-59页

作者： Minchao CUI Yoshihiro DEGUCHI Zhenzhen WANG Seiya TANAKA Min-Gyu JEON Yuki FUJITA Shengdun ZHAO School of Mechanical Engineering Xi'an Jiaotong University Graduate School of Advanced Technology and Science University of Tokushima State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Division of Mechanical Engineering Korea Maritime and Ocean University School of Mechanical Engineering Xi’an Jiaotong University

A remote open-path laser-induced breakdown spectroscopy(LIBS) system was designed and studied in the present work for the purpose of combining the LIBS technique with the steel production line. In this system, the relatively simple configuration and optics were employed to measure the steel samples at a remote distance and a hot sample temperature. The system has obtained a robustness for the deviation of the sample position because of the open-path and alloptical structure. The measurement was carried out at different sample temperatures by placing the samples in a muffle furnace with a window in the front door. The results show that the intensity of the spectral lines increased as the sample temperature increased. The influence of the sample temperature on the quantitative analysis of manganese in the steel samples was investigated by measuring ten standard steel samples at different temperatures. Three samples were selected as the test sample for the simulation measurement. The results show that, at the sample temperature of 500 ℃, the average relative error of prediction is 3.1% and the average relative standard deviation is 7.7%, respectively.

关键词： remote open-path LIBS steel manganese sample temperature quantitative analysis

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Experimental Study on the Boiling Heat Transfer Characteristics of R134a in a Helically Coiled Tube

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Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics 2019年第3期40卷 587-593页

作者： Niu, Xiao-Juan Yuan, Huai-Jie Quan, Chen Bai, Bo-Feng Zhao, Liang State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

The characteristics of R134a boiling heat transfer in a vertically helically coiled tube are studied. The experimental parameters are as follows: the heat flux is 10∼60 kW•m-2, the mass flux is 195∼400 kg•m-2 •s-1, the pressure is 0.8∼1.1 MPa, and the outlet vapor quality is 0.1∼0.9. The experimental data are compared with the existing correlations of boiling heat transfer coefficient. Based on the analysis of boiling heat transfer mechanism, a new correlation for boiling heat transfer in coiled tube is proposed. The circumferential distribution characteristics of wall temperature and heat transfer coefficient are analyzed. The wall temperatures at inner and top side are relatively higher, and the heat transfer coefficients at the bottom and the outer side are relatively higher. The local heat transfer coefficients are compared with the new correlation proposed in this paper. The results show that the heat transfer coefficients at top and bottom sides can be predicted by the new correlation. However, the new correlation underestimates the heat transfer coefficient at the outer side and overestimates that at the inner side, the deviations are 16.6% and -11.9% respectively. © 2019, Science Press. All right reserved.

关键词： Heat transfer coefficients

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Numerical analysis of the axial lead-bismuth pump performace base on the different rotation speed 18

Numerical analysis of the axial lead-bismuth pump performace...

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18th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2019

作者： Wang, Kailin Li, Liangxing Xie, Wei Zhang, Shuangbao State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xianning West Road 28# Xi’an city710049 China

The hydraulic performance of lead-bismuth eutectic (LBE) pump is of great importance for the safety aspects concerning lead-alloy cooled fast reactors (LFRs). To investigate the effect of different rotation speed on the performance of axial LBE pump, different rotation speed axial LBE pumps are designed by planar cascade and streamline method with the same mass flow rate and hydraulic head. Ansys BladeGen is used to establish the three-dimensional model of the axial-flow pump. CFD software (Ansys CFX) carry out numerical calculation. Numerical studies are used to compared the performance between two pumps with different rotation speed. To improve the accuracy of CFD simulation, the numerical result is verified by grid independence method and compared with theoretical calculation result. The flow velocity of the liquid LBE have great impact on the design of LBE pump because of the requirement to avoid affect of corrosion. It is found that the maximum flow velocity of low rotation speed pump is about 7.8 m/s, which is lower than the maximum flow velocity of high rotation speed pump in the case of constant volume and performance. Performance of low rotation speed pump meets the requirements of the reactor operating under long-term high load. The research results could be a viable solution used as a reference for the development of LFRs. © 2019 American Nuclear Society. All rights reserved.

关键词： Pumps

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Particle-Scale Modelling of Injected Hydrogen and Coke Co-Combustion in the Raceway of an Ironmaking Blast Furnace

SSRN

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SSRN 2022年

作者： Dianyu, E. Zhou, Peng Ji, Langyong Cui, Jiaxin Xu, Qiang Guo, Liejin Yu, Aibing International Institute for Innovation Jiangxi University of Science and Technology Ganzhou341000 China Jiangxi Provincial Key Laboratory for Simulation and Modelling of Particulate Systems Jiangxi University of Science and Technology Ganzhou341000 China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an710049 China ARC Research Hub for Computational Particle Technology Department of Chemical Engineering Monash University VIC3800 Australia Centre for Simulation and Modelling of Particulate Systems Southeast University Monash University Joint Research Institute Suzhou215123 China

Hydrogen is an environmentally friendly fuel that does not produce greenhouse gas (GHG) emissions. Its applications have attracted significant attention from many industries, especially the ironmaking industry, which consumes massive amounts of fossil energy. The injection of hydrogen into a blast furnace (BF) is one of the most promising low-carbon ironmaking routines. In this study, an experimentally validated CFD-DEM model is adopted to investigate the dynamics, microstructure and thermochemical behaviours in the raceway of a BF with hydrogen injection operations (HIOs), which include raceway evolution, force distribution and the co-combustion characteristics of hydrogen and coke. Some significant features are obtained through comparison analyses between HIOs and air injection operations (AIOs). In particular, the effects of the hydrogen injection concentration on the raceway size, gas temperature and components are studied. The simulation results show that a smaller raceway is formed under HIOs in comparison with that of AIOs. In addition, the gas temperature is higher near the tuyere but lower along the tuyere axis, and the oxygen consumption is larger and produces more CO. As the hydrogen injection concentration increases: (i) the raceway size and gas temperature decrease;(ii) the CO is generated at the early stage and the maximum CO2 concentration moves to inlet direction along the tuyere axis. The results provide insights on the fundamental understanding of low-carbon ironmaking BF technology. © 2022, The Authors. All rights reserved.

关键词： Blast furnaces

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Compositional Variations in Highly Active Ptsn/Al2o3 Catalysts Derived from Molecular Complexes

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SSRN 2023年

作者： He, Qian Xu, Chaokai Tan, Shengdong Tang, Yaxin Xi, Shibo Yao, Bingqing Wade, Austin Zhao, Binbin Lu, Shangchen Tian, Mingjiao He, Chi Ma, Lu Fu, Xingjie Shi, Jiwei Lu, Jiong Howe, Alexander G.R. Dai, Sheng Luo, Guangfu Du, Yankun Department of Material Science and Engineering College of Design and Engineering National University of Singapore 9 Engineering Drive 1 EA #03-09 Singapore117575 Singapore Department of Materials Science and Engineering Guangdong Provincial Key Laboratory of Computational Science and Material Design Southern University of Science and Technology Guangdong Shenzhen518055 China 1 Pesek Road Jurong Island 627833 Singapore Thermo Fisher Scientific 5350 NW Dawson Creek Drive HillsboroOR United States State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi’an Jiaotong University Shaanxi Xi’an710049 China Brookhaven National Laboratory UptonNY11973 United States Department of Chemistry National University of Singapore 12 Science Drive 2 117549 Singapore Key Laboratory for Advanced Materials Joint International Research Laboratory of Precision Chemistry and Molecular Engineering School of Chemistry and Molecular Engineering East China University of Science & Technology Shanghai200237 China

We investigated the industrially important PtSn/Al2O3 catalysts prepared with uniform particle sizes (~ 1 nm) and varied compositions using molecular complexes of Pt(II) and Sn(II). Our best catalyst, with a Sn:Pt ratio of around 2, exhibited a high initial propylene productivity of about 1.1 mol C3H6 (g catalyst)-1 h-1. Elaborate electron microscopy studies revealed significant compositional variations in the catalyst, highlighting the practical challenges in achieving or confirming the theoretically predicted optimum Sn:Pt ratio. It is also found that the catalytic activities correlate well with the Pt dispersion, suggesting the structure-insensitive nature of the dehydrogenation reaction applies in these ultrasmall Pt-Sn nanoparticles. The presence of Pt-rich particles in the catalysts did not produce noticeable degradations in the reaction selectivity, indicating a wide composition range for Pt-Sn nanoparticles to be effective at the 1 nm size range. These findings emphasize the importance of detailed analysis of compositional distributions for understanding nanoalloys. © 2023, The Authors. All rights reserved.

关键词： Electron microscopy

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Wake of a stationary sphere near a wall

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Huagong Xuebao/CIESC Journal 2019年第9期70卷 3300-3306页

作者： Li, Xing Bai, Bofeng State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'anShaanxi710049 China

The flow characteristics of the sphere under uniform flow in a large space have been extensively studied, but the influence of the wall on the flow characteristics of the sphere is not clear. The wake of the particle is focused. Results show that there are three regimes of the sphere wake, which are steady wake, unsteady symmetric wake and unsteady asymmetric wake. If Re400, the vortex shedding is not symmetric and becomes chaotic as Reynolds number increases. © All Right Reserved.

关键词： Wakes

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Function-switchable metal/semiconductor junction enables efficient photocatalytic overall water splitting with selective water oxidation products

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Science Bulletin 2020年第16期65卷 1389-1395,M0004页

作者： Daixing Wei Yubo Tan Yiqing Wang Tingting Kong Shaohua Shen Samuel S.Maoc International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi'an Jiaotong UniversityXi'an 710049China College of Chemistry and Chemical Engineering Xi'an Shiyou UniversityXi'an 710054China Department of Mechanical Engineering University of California at BerkeleyBerkeleyCA 94720USA

A novel metal/semiconductor photocatalyst,Cu nanoparticles(NPs)modified TiO2 hollow spheres(Cu/TiO2),was designed for efficient photocatalytic overall water splitting(POWS)under both ultraviolet(UV)and visible(Vis)*** Cu/TiO2 photocatalyst possesses excellent POWS performance under Vis light at the highest level among the reported TiO2-based ***,the metal/semiconductor junction formed between Cu and TiO2 enables controlled water-oxidation product selectivity(H2O2 or O2)via different reaction pathways regulated by irradiation *** UV light,the electrons excited in TiO2 are captured by Cu NPs through the Cu/TiO2 Schottky interface for H2 production,with the photoholes in TiO2 producing H2O2 through a two-electron process;whilst under Vis light,Cu NPs act as plasmon to inject hot electrons to TiO2 for H2 production,while O2 is produced by hot holes on Cu NPs via a four-electron *** rational design of function-switchable metal/semiconductor junction may be helpful to understand the mechanisms for POWS with desired gas/liquid water-oxidation products.

关键词： Photocatalysis Water splitting Product selectivity Reaction pathway Metal/semiconductor junction

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Effects of Flue Gas Recirculation on Combustion and Heat Flux Distribution in 660 Mw Double-Reheat Tower-Type Boiler

SSRN

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SSRN 2022年

作者： Deng, Lei Dong, Lingxiao Bai, Yang Wu, Yuhao Liu, Hu Belošević, Srdjan Tomanović, Ivan Che, Defu State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi’an Jiaotong University Xi’an710049 China Guoshen Institute of Technology CHN ENERGY Xi'An710065 China Department of Thermal Engineering and Energy "VINČA" Institute of Nuclear Sciences National Institute of thе Republic of Serbia University of Belgrade Mike Petrovića Alasa 12-14 11351 Vinča PO Box 522 Belgrade11001 Serbia

The ultra-supercritical double-reheat boiler has attracted more attention because of high parameters, low pollution and large capacity. However, there are some difficulties in the development of this technology, such as adjusting the reheat steam temperature. In this study, computational fluid dynamics simulation is used to analyze a 660 MW double-reheat tower-type pulverized coal-fired boiler. The influence of flue gas recirculation (FGR) on heat transfer characteristics and combustion process in the furnace (including heating surfaces in the upper parts of the furnace) are evaluated. The user-defined function approach predicates CO reduction effect on NO x . The results show that the flow at the horizontal section through the centerline of recirculating flus gas nozzles is rotating. The velocity distribution changes into an elliptical rotating flow when FGR ratio is 20%. At higher FGR ratios, the high-temperature area (1565-1700 K) shrinks and both the NO x concentration at the low-temperature superheater outlet and oxygen concentration in the furnace descend. Oxygen concentration at low-temperature superheater outlet first increases and then decreases. In the main combustion zone, the heat flux peak of water-cooled wall is about 330 kW m -2 . As FGR ratio increases from 0% to 20%, the rate of water-cooled wall heat absorption to total boiler decreases by 3.50%. This rate for reheater and superheater increases by 2.53% and 2.13%, respectively. © 2022, The Authors. All rights reserved.

关键词： Temperature

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CFD and FEM combined study on the solid particle erosion damage of multi-stage compressor blades

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Powder Technology 2025年

作者： Hongkun Zhan Yanfang Hou Liuxi Cai Jiaming He Yun Li Shunsen Wang Juan Di School of Chemical Engineering and Technology Xi'an Jiaotong University Xi'an 710049 PR China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 PR China School of Vehicle and Traffic Engineering Taiyuan University of Science and Technology Taiyuan 030024 PR China

Dust and sand particles in the air can cause serious erosion damage to the titanium alloy blades of the compressor, significantly reducing the working life of the engine. To study the erosion mechanism of solid particles on multi-stage compressor blades in detail, first, CFD gas-solid two-phase flow numerical simulation method is employed to study the motion and impact behavior of quartz sand particles in the compressor flow channel, which clarify the macroscopic mechanism of particle erosion damage on the blades and determine the particle impact parameters. Then, the microscopic erosion damage mechanism of titanium alloy blades is studied through an improved FEM method. Considering the characteristics of multiple particle impingement, random particle shape, random impingement position, and repetitive erosion process during the impact process, a three-dimensional multi-particle random cyclic impact finite element calculation model is established for the first time. On the basis, coupled analysis of the characteristics of material microdamage morphology, system energy conversion and dissipation, and target material erosion weight loss is conducted to reveal the dynamic erosion damage mechanism of multi-particle impacting titanium alloys. Finally, the influences of factors such as the impact velocity, impact angle, and particle shape on the dynamic erosion damage behavior of titanium alloy targets were explored.

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Optimization and renovation of energy complementary intra-plant/inter-plant integrated heat exchanger networks for waste heat recovery in the calcium carbide industry

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Process Safety and Environmental Protection 2025年 199卷

作者： Wang, Hongxia Li, Xiaoli Guo, Peinan Zhang, Zaoxiao Shi, Lei School of Chemical Engineering and Technology Xi'an Jiaotong University Xi'an710049 China State Key Laboratory of Multiphase Flow in Engineering Xi'an Jiaotong University No.28 Xianning West Road Xi'an710049 China Zhejiang Fengwang Environmental Protection Co. Ltd Zhejiang 323000 China

The calcium carbide industry, characterized by its energy and emissions intensity, faces pressing sustainability demands in the "double-carbon" era. This study identifies substantial energy-saving opportunities within heat exchange networks. An optimization method is proposed that combines intra-/inter-plant heat integration to retrofit carbide plant heat exchange networks for energy efficiency. This approach is primarily based on pinch technology, where the heat exchange was first reconstructed within subsystems to minimize utility consumption. Results indicate that the intra-plant heat integration yields energy savings of 31.49 % for subsystem 1 and 28.79 % for subsystem 2. Subsequently, excess heat and cooling loads from the optimized subsystems were extracted as new heat exchange streams, facilitating heat exchange matching between subsystems. Thus, excess heat from subsystem 1 serves as heat source, while the excess cold from subsystem 2 acts as heat sink in inter-plant integration, creating a synergistic energy-saving mechanism to achieve inter-plant heat integration. The total energy from inter-plant heat integration reaches 10.83 MW, contributing to an overall heat recovery potential of 38.55 MW, ultimately achieving a remarkable total energy saving rate while minimizing the heat exchange units in this case. This research underscores the importance of multi-energy complementarity in advancing energy efficiency for future carbide industry. © 2025

关键词： Energy efficiency

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