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Improved Photocatalytic H 2 Evolution from Inorganic/Organic Sacrificial Solution over Ni-Doped (CuIn) 0.2 Zn 1.6 S 2 Photocatalysts

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MRS Online Proceedings Library 2011年第1期1326卷 1-6页

作者： Xianghui Zhang Dengwei Jing Liejin Guo State Key Lab of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an PR China

The Ni-doped (CuIn)0.2Zn1.6S2 photocatalysts were prepared via a two-step ultrasonic-hydrothermal method under an environmental-friendly condition. XRD pattern profiles suggested that Ni2+ successfully doped into (CuIn)0.2Zn1.6S2 lattice. UV-Vis spectra indicated that the optical properties of the photocatalysts greatly depended on the amount of Ni doped. SEM images show that the samples were microspheres. The microsphere structures were gradually damaged with the increment of Ni doping amount. The photoactivity of (CuIn)0.2Zn1.6S2 was enhanced when Ni2+ was doped into the crystal structure. The H2 evolution performance over the prepared samples from inorganic/organic sacrificial solution was systematic investigated.

关键词： catalytic energy generation hydrogenation

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Experimental investigation of heat transfer for supercritical pressure water flowing in vertical annular channels

Experimental investigation of heat transfer for supercritica...

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作者： Gang, Wu Bi, Qincheng Yang, Zhendong Wang, Han Zhu, Xiaojing Hao, Hou Leung, L.K.H. State Key Laboratory of Multiphase Flow in Power Engineering Xi'An Jiaotong University Xi'an 710049 China Atomic Energy of Canada Limited Chalk River ON K0J 1J0 Canada

An experiment has recently been completed at Xi'an Jiaotong University (XJTU) to obtain wall-temperature measurements at supercritical pressures with upward flow of water inside vertical annuli. Two annular test sections were constructed with annular gaps of 4 and 6 mm, respectively, and an internal heater of 8 mm outer diameter. Experimental-parameter ranges covered pressures of 23-28 MPa, mass fluxes of 350-1000 kg/m2/s, heat fluxes of 200-1000 kW/m2, and bulk inlet temperatures up to 400 °C. Depending on the flow conditions and heat fluxes, two distinctive heat transfer regimes, referring to as the normal heat transfer and deteriorated heat transfer, have been observed. At similar flow conditions, the heat transfer coefficients for the 6 mm gap annular channel are larger than those for the 4 mm gap annular channel. A strong effect of spiral spacer on heat transfer has been observed with a drastic reduction in wall temperature at locations downstream of the device in the annuli. Two tube-data-based correlations have been assessed against the experimental heat transfer results. The Jackson correlation agrees with the experimental trends and overpredicts slightly the heat transfer coefficients. The Dittus-Boelter correlation is applicable only for the normal heat transfer region but not for the deteriorated heat transfer region. © 2011 Published by Elsevier B.V.

关键词： Heat transfer coefficients

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Deposition of Cement Kiln Ash on the Tubes of Waste Heat Recovery Boiler

Deposition of Cement Kiln Ash on the Tubes of Waste Heat Rec...

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IEEE PES Asia-Pacific power and Energy engineering Conference (APPEEC)

作者： Yufeng Wang Chunyun Hu Shi'en Hui Qinxin Zhao Qulan Zhou State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an Shaanxi China

Deposition of cement kiln ash on the tubes of heat recovery boiler affects the heat exchange efficiency. The basic characteristic of cement kiln ash and the deposition on the tubes with different arrangements are presented. Numerical simulation and experiment measurement show that flow field feature, especially the low-velocity zone and vortex street, causes different shape of ash deposit around the tube. The effect of ash concentration, tube arrangement and gas velocity on the deposition is analyzed. The effect of the tube diameter and the gas composition is also discussed.

关键词： Ash Electron tubes Surface treatment Heat recovery Waste heat Shape Boilers

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Decalin dehydrogenation on active carbon supported Pt-Ni bimetallic catalysts

Decalin dehydrogenation on active carbon supported Pt-Ni bim...

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International Conference on Mechanic Automation and Control engineering (MACE)

作者： Lei LingHu Weitao Wu Suitao Qi Chunhai Yi Gangli Zhu Bolun Yang Department of Chemical Engineering State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China

Pt-Ni bimetallic catalysts and their corresponding monometallic catalysts supported on active carbon were prepared by incipient wetness impregnation or chelating formaldehyde reduction. The effect of feed/catalyst ratio and the metal impregnation sequence for active carbon supported bimetallic nanoparticle on dehydrogenation activity of decalin was investigated. The results showed that the conversion of decalin increased up to 72% over 3%Pt/C catalyst when the feed/catalyst ratio reached 3.3 mL/g, under which condition the catalyst was in the liquid film state, having a higher temperature and larger contact area. The Pt-Ni/C bimetallic catalyst showed higher activity than either Pt/C or Ni/C monometallic catalyst. The impregnation sequence has a significant effect on the catalytic performance of three bimetallic supported catalysts. Pt first catalyst displayed the best dehydrogenation activity and selectivity to naphthalene. It reveals that the impregnation sequence more likely altered the location of active metal species and the formation of Pt-Ni bimetallic bond, which lead to the different catalytic behavior for decalin dehydrogenation.

关键词： Nickel Hydrogen Carbon Hydrogen storage Organic chemicals X-ray scattering Chemicals

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Analysis Of Thermal-Hydraulic Performance During Full Pressure Startup Scheme Of IPWR

Analysis Of Thermal-Hydraulic Performance During Full Pressu...

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The Fifth China-Korea Workshop on Nuclear Reactor Thermal Hydraulics

作者： Liang zhao Guanghui Su Suizheng Qiu Wenxi Tian Zhangli Wang Department of Nuclear Science and Technology State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University

In an integral pressurized water reactor(IPWR), the primary coolant system components and the loop system equipment are housed in the reactor pressure vessel, and the pipe lines connecting between those components are eliminated because of the requirement of compact layout in-vessel. The compactness and inherent safety of the system are enhanced with the concise structure. Thus, this design scheme is suitable for the medium or small size nuclear power plants or ships nuclear systems in the economic and technological aspects. According to the thermal- hydraulic characteristics of the IPWR,a reasonable description of the system mathematical and physical model is established, including core model, simplified pump model, once-through steam generator (OTSG) model, flow friction and heat transfer models. Meanwhile, all possible flow and heat transfer conditions are considered and the corresponding optional models are presented. In addition, the Gear method is used for the numerical solution of transient equations. The full pressure startup method is simulated with this model. Because of the adoption of modular programming techniques, both of the steady and transient state analysis codes can be applied easily to other thermal-hydraulic analysis of special reactors and special cases by modifying and updating the corresponding function modules.

关键词： Analysis Of Thermal-Hydraulic Performance During Full Pressure Startup Scheme Of IPWR

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Development of RETAC for AP1000 Thermal-hydraulic Characteristics and Safety Analysis on PRHRS Inadvertent Operation Accident

Development of RETAC for AP1000 Thermal-hydraulic Characteri...

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The Fifth China-Korea Workshop on Nuclear Reactor Thermal Hydraulics

作者： W.W.Wang G.H.Su W.X.Tian S.Z.Qiu State Key laboratory of Multiphase Flow in Power Engineering Department of Nuclear Science and Technology Xi'an Jiaotong University

In the present study, a thermal-hydraulic safety analysis code for AP1000 named RETAC (REactor Transient Analysis Code) has been developed using FORTRAN 90 language. A point reactor neutron kinetics model with six groups of delayed neutrons was adopted to describe the core thermal power transient. A distribute parameter model with two-phase drift flux model was used in the U-tube steam generator simulation. In the pressurizer simulation, a multi-region non-equilibrium model was adopted. Similar to current large commercial codes such as RELAP5 and RETRAN series, the four-quadrant analogy curves were used for the solution of the transient behaviors of the main coolant pumps. In this paper, a new and reasonable model for the passive residual heat removal heat exchanger (PRHR HX) was proposed based on basic equations of mass, momentum and energy. Gear method and Adams predictor-corrector method were adopted alternately for a better solution to ill-condition differential equations corresponding to detail processes. The PRHR HX inadvertent operation accident was chosen in the transient accident analysis. Furthermore, the simulation results obtained by RETAC were compared with that by Westinghouse-developed LOFTRAN code. The comparison results showed a good agreement and thus proved the accuracy and reliability of the RETAC code. With the adoption of modular programming techniques, the RETAC code can be easily modified and applied to higher power passive safety reactors in the future.

关键词： RELAP Development of RETAC for AP1000 Thermal-hydraulic Characteristics and Safety Analysis on PRHRS Inadvertent Operation Accident

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Thermal hydraulics investigations in different fuel packing model of Pebble Bed Water cooled Reactor

Thermal hydraulics investigations in different fuel packing ...

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The Fifth China-Korea Workshop on Nuclear Reactor Thermal Hydraulics

作者： Hua Li Suizheng Qiu Guanghui Su Wenxi Tian Youjia Zhang Department of Nuclear Science and Technology State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University

A pebble bed water cooled reactor (PBWR) is one of the renewed reactor designs in nuclear power generation. It is currently under consideration and development worldwide in the conceptual design of high temperature gas-cooled reactor and supercritical water-cooled reactor. In this study, the different geometrical models of the PBWR were built in which the thermal- hydraulic characteristics of the coolant were analyzed and compared. The results indicate that with the same physical parameters and boundary conditions, the packing form of body-centered cubic is the best choice to the actual case.

关键词： CFD Thermal hydraulics investigations in different fuel packing model of Pebble Bed Water cooled Reactor

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Design and Transient Analyses of Passive Emergency Feedwater System of CPR1000. Part I: Air Cooling Condition

Design and Transient Analyses of Passive Emergency Feedwater...

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The Fifth China-Korea Workshop on Nuclear Reactor Thermal Hydraulics

作者： Ya-Pei Zhang Sui-Zheng Qiu Guang-Hui Su Wen-Xi Tian State Key Laboratory of Multiphase Flow in Power Engineering Department of Nuclear Science and Technology Xi'an Jiaotong University

The steam generator secondary passive emergency feedwater system is a new design for traditional generation II + reactor CPR1000. The passive emergency feedwater system is designed to supply water to the SG shell side and improve the safety and reliability of CPR1000 by completely or partially replacing traditional emergency water cooling system in the event of the feed line break (FLB) or loss of heat sink accident. The passive emergency feedwater system consists of steam generator (SG), heat exchanger (HX), air cooling tower, emergency makeup tank (EMT), and corresponding pipes and valves for air cooling condition. In order to improve the safety and reliability of CPR1000, the model of the primary loop system and the passive emergency feedwater system was developed to investigate residual heat removal capability of the passive emergency feedwater system and the transient characteristics of the primary loop system affected by the passive emergency feedwater system using RELAP5/MOD3.4. The transient characteristics of the primary loop system and the passive emergency feedwater system were calculated in the event of feed line break accident. Sensitivity studies of the passive emergency feedwater system were also conducted to investigate the response of the primary loop and the passive emergency feedwater system on the main parameters of the passive emergency feedwater system. The passive emergency feedwater system could supply water to the SG shell side from the EMT successfully. The calculation results showed that the passive emergency feedwater system could take away the decay heat from the primary loop effectively for air cooling condition, and that the single-phase and two-phase natural circulations were established in the primary loop and passive emergency feedwater system loop, respectively.

关键词： Part I Design and Transient Analyses of Passive Emergency Feedwater System of CPR1000 Air Cooling Condition CPR

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Decalin dehydrogenation on active carbon supported Pt-Ni bimetallic catalysts

Decalin dehydrogenation on active carbon supported Pt-Ni bim...

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2011 2nd International Conference on Mechanic Automation and Control engineering, MACE 2011

作者： Hu, Lei Ling Wu, Weitao Qi, Suitao Yi, Chunhai Zhu, Gangli Yang, Bolun Department of Chemical Engineering State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

ISBN: (纸本)9781424494392

关键词： Dehydrogenation

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Surface Modification of α-Fe 2 O 3 Nanorod Array Photoanodes for Improved Light-Induced Water Splitting

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MRS Online Proceedings Library 2011年第1期1326卷 1-6页

作者： Shaohua Shen Coleman X. Kronawitter Jiangang Jiang Liejin Guo Samuel S. Mao State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an Shaanxi China Environmental Energy Technologies Division Lawrence Berkeley National Laboratory Berkeley USA

α-Fe2O3 nanorod arrays were fabricated by a low-temperature aqueous chemical growth (ACG) technique and followed by an annealing process. For the surface doping of α-Fe2O3 nanorods, β-FeOOH nanorods obtained via ACG were coated with a thin layer of Cr3+ precursor solution by spin coating, and then underwent the annealing treatment in air. Conducting polymer polypyrrole (PPy) decorated α-Fe2O3 nanorods were prepared by electrodeposition method using malic acid contained pyrrole aqueous solution. Primary results showed that the photocurrents of α-Fe2O3 nanorod array photoanodes were greatly enhanced by surface doping of Cr3+, as well as PPy decoration. This might be due to the retarded charge recombination and promoted surface reaction rate of photogenerated holes with water. Further investigation on surface modification of α-Fe2O3 nanorod array photoanodes is currently conducted in our group.

关键词： dopant energy generation nanostructure

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