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Experimental study on mercury content in flue gas of coal-fired units based on laser-induced breakdown spectroscopy

Plasma Science and Technology 2020年第7期22卷 75-82页

作者： Kai RONG Zhenzhen WANG Ruomu HU Renwei LIU Yoshihiro DEGUCH Junjie YAN Jiping LIU State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong UniversityXi'an 710049People’s Republic of China Graduate School of Technology Industrial and Social SciencesTokushima UniversityTokushima 770-8501Japan Moe Key Laboratory of Thermo-Fluid Science and Engineering Xi'an Jiaotong UniversityXi'an 710049People’s Republic of China

Accurate measurement of trace heavy metal mercury(Hg) in flue gas of coal-fired units is great significance for ecological and environmental *** gas was used to simulate the actual flue gas of a power plant in this study.A laser-induced breakdown spectroscopy(LIBS)system for Hg measurement in mixed gas was built to study the effect of mixed gas pressure,Hg concentration in mixed gas and delay time on Hg *** experimental results show that the appropriate low mixed gas pressure can obtain high Hg signal intensity and signal to noise *** Hg signal intensity and signal to noise ratio increased with the increase of Hg concentration in mixed *** Hg signal intensity and signal to noise ratio decreased with the increase in delay *** to the above results,the optimized measurement conditions can be *** Hg concentrations in mixed gas were quantitatively analyzed by the internal standard method and traditional calibration method *** relative error of prediction of the test sample obtained by the internal standard method was within 11.11%.The relative error of prediction of the traditional calibration method was less than 14.54%.This proved that the internal standard method can improve the accuracy of quantitative analysis of Hg concentration in flue gas using LIBS.

关键词： laser-induced breakdown spectroscopy flue gas trace heavy metal quantitative analysis

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Hydrodynamic and heat transfer properties of magnetic fluid in porous medium considering nanoparticle shapes and magnetic field-dependent viscosity

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Chinese Journal of Chemical engineering 2020年第2期28卷 329-339页

作者： Mohsen Izadi Masoud Javanahram Seyed Mohsen Hashem Zadeh Dengwei Jing Mechanical Engineering Department Lorestan UniversityKhorramabadIran Mechanical Engineering Department Islamic Azad UniversityBushehrIran Department of Mechanical Engineering Shahid Chamran University of AhvazIran School of Energy and Power Engineering State Key Lab of Multiphase Flow in Power EngineeringXi'an Jiaotong UniversityXi'an 710049China

The purpose of this paper is to study the characteristics of the combined convection heat transfer and a micropolar nanofluid flow passing through an impermeable stretching sheet in a porous *** nanofluid flow field is affected by a magnetic field perpendicular to the *** dynamic viscosity of the micropolar nanofluid changes under the influence of the magnetic *** continuity,linear momentum,angular momentum,and energy equations are first simplified using the order of magnitude technique that,along with the applied boundary conditions and the definition of the appropriate parameters,are transferred to the similarity space using the similarity *** the resulting equations are solved using the Runge–Kutta *** distinction of the macroscale and microscale flow fields and temperature fields resulting from different nanoparticle shapes was *** the Hartmann number,the vortex viscosity parameter,the magnetic parameter,the nanoparticle volume fraction,and the permeability parameter of the porous media increased the surface friction on the *** the vortex viscosity parameter,the magnetic parameter,and the volume fraction of the nanoparticles increases the Nusselt number.

关键词： MHD-combined convection Porous media Magnetic micropolar nanofluid

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Research on Behavior of Corrugated Packing in Vacuum Distillation Tower

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China Petroleum Processing & Petrochemical Technology 2012年第2期14卷 39-43页

作者： Wang Yubo Qiu Xingqi Miao Haibin Xu Zhan State Key Laboratory of Multiphase Flow in Power Engineering Xi 'an Jiaotong University Xi 'an 710049 College of Chemistry and Chemical Engineering China University of Petroleum Qingdao 266555 PetroChina Dagang Petrochemical Company Tianjin 300280

The corrugated packing is prone to break down easily, which can affect the tower efficiency substantially. It is the inner environment of the vacuum distillation tower including the temperature and chemical nature of fluid that lead to the packing damage. The theoretical analysis indicates that it is the inner material flow of vacuum distillation tower that leads to the vibration of packing, which can affect the corrosion fatigue of packing significantly. Meanwhile, the modal shape and inherent frequency of packing under prestress can be obtained by means of mathematical analysis. Based on the two kinds of analysis, the flow induced vibration and corrosion fatigue are accountable for the failure of packing.

关键词： flow induced vibration theoretical analysis mathematical analysis inherent frequency corrosion fatigue

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Electronic Structures and Optical Absorption Properties of Ni-doped Anatase TiO2for Photocatalysis from First-Principles Calculation 18

Electronic Structures and Optical Absorption Properties of N...

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18th World Hydrogen Energy Conference, WHEC 2010

作者： Liu, Maochang Zhou, Zhaohui Li, Mingtao Guo, Liejin State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi'an Jiaotong University 28 Xianning Street Shaanxi Xi'an710049 China

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A subcooled boiling model developed for narrow rectangular channels based on the CFD method 18

A subcooled boiling model developed for narrow rectangular c...

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

作者： Li, Linfeng Wang, Mingjun Zhang, Dalin Tian, Wenxi Su, G.H. Qiu, Suizheng State Key Laboratory of Multiphase Flow in Power Engineering School of Nuclear Science and Technology Xi’an Jiaotong University Xi’an710049 China

The accurate prediction of subcooled boiling phenomena in narrow rectangular channels is of great importance for the plate type fuel reactor core safety analysis during some critical scenarios. Serious of experimental studies on subcooled boiling in narrow rectangular channels indicate that a bubble may slide on the heating surface after nucleation and then lift to the main flow, merging with not-yet-fully-grown bubble and disrupting local boundary layer. In this paper, the influence of sliding bubbles is taken into consideration in wall boiling model and implanted into the CFD code to simulate boiling in narrow rectangular channel. Bubble dynamics is used in calculating the relevant bubble diameters during ebulletin cycle. The feasibility of this proposed model is validated with existed experimental data by comparing wall superheat. This work could promote the development of CFD two-phase flow simulation capacity in the plate type fuel nuclear reactor. © 2019 American Nuclear Society. All rights reserved.

关键词： Computational fluid dynamics

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Investigation on flow boiling heat transfer characteristics of water in vertically-upward spirally-ribbed tubes under subcritical pressures

Investigation on flow boiling heat transfer characteristics ...

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International Conference on power engineering, ICOPE 2015

作者： Zhang, Weiqiang Li, Huixiong Zhang, Qing Zhang, Qian Kong, Xiangfei Wu, Jinkai State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xianning West Road 28 Xi'an710049 China

Series of experiments have been performed at different pressures from 12 to 19 MPa, mass velocities from 400 to 1000 kg·m-2· s-1, inner wall heat fluxes from 300 to 500 kW· m-2 and bulk fluid enthalpy from 800 to 3100 kJ·kg1, to study flow boiling heat transfer characteristics of water in seven vertically-upward spirally-ribbed tubes with different rib structures. Based on the experimental results, effects of pressure, mass velocity and heat flux on flow boiling heat transfer coefficient (HTC) were discussed. It was found that, saturated flow boiling HTC was nearly invariable with an increase in mass velocity, but it increased distinctly with the increase in heat flux. As the pressure increased, the flow boiling HTC increased. Some existing correlations for predicting flow boiling HTC of water in the spirally-ribbed tubes were evaluated with the test data collected from open literatures and obtained in this experiment. On the basis of experimental results of flow boiling heat transfer from open literature and internal report, a new universal correlation for the flow boiling HTC of subcritical pressure water was developed for spirally-ribbed tubes with different rib structures, by introducing suitable dimensionless quantities of the spirally-ribbed tube structures to the existing empirical correlations. It was shown that the values calculated by the new correction are in good agreement with the experimental data for the two new-type spirally-ribbed tubes, indicating that the newly proposed universal correlation could provide good support for the application of the vertically-upward spirally-ribbed tubes. © 2015 The Japan Society of Mechanical Engineers.

关键词： Heat flux

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Laminar Flame Instability of n-Hexane,n-Octane,and n-Decane in Spherical Expanding Flames

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Journal of Thermal Science 2024年第3期33卷 1189-1199页

作者： YIN Geyuan HU Erjiang LI Xiaotian LV Xin HUANG Zuohua State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an710049China United Automotive Electronic Systems Co. LtdShanghai201206China Chongqing Changan Automobile Co. Ltd.Chongqing401120China

This paper focuses on the laminar flame instability of three high molecular weight n-alkanes,namely n-hexane,n-octane,and *** experiment was carried out in a constant volume combustion bomb to get the flame *** critical radius under different conditions was extracted using the image processing *** with the existing critical Peclet number theory,the dominant factors of flame instability under current conditions for three n-alkanes can be figured ***,the average cell size(equivalent cell radius,R_(cell))was extracted to provide quantitative analysis of the flame cellular structure,based on the method developed in this *** theoretical R_(cell)were also calculated and compared with the experimental results to validate the proposed method.

关键词： cellular instability equivalent cell radius critical Peclet number spherical flame

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Low to intermediate temperature ignition delay times of nitromethane 12

Low to intermediate temperature ignition delay times of nitr...

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12th Asia-Pacific Conference on Combustion, ASPACC 2019

作者： Yang, Meng Tang, Chenglong Huang, Zuohua State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xianning West Road Xi'an Shaanxi710049 China

In this work, the auto-ignition experiments of nitromethane at the low to intermediate temperature, fuel concentration of 2%, pressure of 30 bar and different equivalence ratios have been investigated by using rapid compression machine. The pressure profiles of nitromethane ignition were observed. Results show that a distinct two-stage heat release process is found at ? = 0.5. And multi-stage heat release is also observed with temperature decreasing. Subsequently, the effect of equivalence ratio on the nitromethane ignition is performed. The results show that the dependence of nitromethane ignition on the equivalence ratio is weak. In addition, the experimental data are used to validate the recent developed mechanisms of nitromethane. Relative large deviations are observed between experiments and predictions. © Asia-Pacific Conference on Combustion, ASPACC *** right reserved.

关键词： Combustion

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Natural convection heat transfer of water in a horizontal circular gap

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中国高等学校学术文摘·能源与动力工程 2007年第2期1卷 167-173页

作者： SU Guanghui Kenichiro Sugiyama WU Yingwei State Key Laboratory of Multiphase Flow in Power Emgineering Xi'an jiaotong University Xi'an 710049China Faculty of Engineering Hoddaido University North Ward Sapporo 060-8628Japan

An experimental study on the natural convection heat transfer on a horizontal downward facing heated surface in a water gap was carried out under atmospheric pressure conditions. A total of 700 experimental data points were correlated using Rayleigh versus Nusselt number in various forms, based on different independent variables. The effects of different characteristic lengths and film temperatures were discussed. The results show that the buoyancy force acts as a resistance force for natural convecti on beat transfer ona downward facing horizontal heated surface in a confined space. For the estimation of the natural convection heat transfer under the present conditions, empirical correlations in which Nusselt number is expressed as a function of the Rayleigh number, or both Rayleigh and Prandtl numbers, may be used. When it is accurately predicted, the Nusselt number is expressed as a function of the Rayleigh and Prandtl numbers, as well as the gap width-to-heated surface diameter ratio; and uses the temperature difference between the heated surface and the ambient fluid in the definition of Rayleigh number. The characteristic length is the gap size and the film temperature is the average fluid temperature.

关键词： natural convection downward facing heated surface gap size buoyancy force

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Kinetics of hydrogen abstraction and addition reactions of 3-hexene by H radical

Kinetics of hydrogen abstraction and addition reactions of 3...

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11th Asia-Pacific Conference on Combustion, ASPACC 2017

作者： Yang, Feiyu Sun, Wuchuan Pan, Youshun Deng, Fuquan Jiang, Xue Zhang, Yingjia Huang, Zuohua State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xianning West Road Xi’anShaanxi710049 China

Rate coefficients of H-atom abstraction and addition reactions of 3-hexene by the hydroxyl radical (H) were determined using canonical variational transition-state theory, with potential energy surface evaluated at the CCSD/CBS//BHandHLYP/6311G (d, p) level and quantum mechanical effect corrected by the multi-dimensional small-curvature tunneling method. Results reveal that accounting for approximate 70% of the overall H-atom abstractions occur in the allylic site via both direct and indirect channels. The indirect channel containing two Van der Waals pre-reactive complexes exhibits two times higher rate coefficient relative to the direct one. The H-addition reaction also contains two Van der Waals complexes, and its submerged barrier results in a negative temperature coefficient behavior at low temperatures. In contrast, the H-addition pathway dominates only at the temperatures below 590 K whereas the H-atom abstraction reactions dominate overwhelmingly at the temperature over 590 K. All of the rate coefficients calculated with an uncertainty of a factor of 5 were estimated. Analyses on the potential energy surface and minimum reaction path were also performed in this study. © 2018 Combustion Institute. All Rights Reserved.

关键词： Addition reactions

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