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Investigation of severe accident scenario of PWR response to LOCA along with SBO

Progress in Nuclear Energy 2015年 83卷 159-166页

作者： Liang Hu Yapei Zhang Longze Li G.H. Su Wenxi Tian Suizheng Qiu State Key Laboratory of Multiphase Flow in Power Engineering Department of Nuclear Science and Technology Xi'an Jiaotong University Xi'an City 710049 China

Severe accident analysis is important for the safety evaluation of a nuclear power plant (NPP). In this paper, analysis has been performed for a Chinese three-loop Pressurized Water Reactor (PWR) severe accident induced by loss of coolant accident (LOCA) along with Station- Block-Out (SBO) using the MIDAC code. The simulation results show the influence of different break sizes in the cold leg on the severe accident progression. Important parameters, such as primary coolant system (RCS) pressure, core melting time, pressure vessel rupture time. are analyzed with three different break sizes in the cold leg. With the break size of 0.002 m 2 , the reactor core starts to melt at 1481 s and the lower head fails at 10,317 s after the accident occurs. With a larger break size of 0.05 m 2 , the reactor core starts to melt at 1066 s and the lower head fails at 2473 s. If the break size is further enlarged to 0.2 m 2 , the reactor core starts to melt at 422 s and the lower head fails at 1757 s. Another case in which a hot leg break is with the size of 0.002 m 2 is performed. The reactor core starts to melt at 3641 s and the lower head fails at 14,744 s. It is less severe than the cold leg break accident. The severe accident prevention and mitigation measures are summarized based on the computation results. The results are helpful to develop the management strategies and guideline for the severe accident of the similar types of PWRs.

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Simulation of the spread of oil slicks by a multiphase particle method

Simulation of the spread of oil slicks by a multiphase parti...

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7th International Conference on Fluid Mechamics(ICFM7)(第七届国际流体力学会议)

作者： Guangtao Duan Bin Chen State Key Laboratory of Multiphase Flow in Power Engineering Xi''an Jiaotong UniversityXi''an710049China

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A three-dimensional numerical analysis of platelet flow in a carotid artery

A three-dimensional numerical analysis of platelet flow in a...

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7th International Conference on Fluid Mechamics(ICFM7)(第七届国际流体力学会议)

作者： Guojie Li Bin Chen State Key Laboratory of Multiphase Flow in Power Engineering Xi''an Jiaotong UniversityXi''an710049China

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The optimized design and experimental analysis of CPC-PV / T system

The optimized design and experimental analysis of CPC-PV / T...

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International Conference on Renewable Power Generation, RPG 2015

作者： Chen, Haiping Wang, Chenhui Sun, Jieling Ai, Dengxin Ye, Chentao Li, Zhaohao Wei, Jinjia School of Energy Power and Mechanical Engineering National Thermal Power Engineering and Technology Research Center North China Electric Power University Beijing102206 China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Shanxi Province710049 China

ISBN: (纸本)9781785610400

With the CPC integrated photovoltaic / thermal (PV/T) system as the research object, this paper studies the design techniques, builds experimental platform of the system and analyzes its thermal and electrical performance. Firstly, the basic architecture parameters of CPC is designed and the key factor which influences the concentrating uniformity of CPC is found via the software named lighttools simulation so that the light distribution uniformity of PV panel is improved. Secondly, the manufacture technique of PV/T collector is designed, including the determination of the size of PV module and the external and internal dimensions of the flat cassette collector. The entire PV/T collector is manufactured by means of direct lamination. Finally, according to the manufactured CPC and PV/T, the experimental platform of CPC integrated PV/T system, whose power is 1kW, is built. The thermal-electrical performance evaluation model of the experimental platform is established. The thermal-electrical performance of the experimental platform is tested and the results show that the water temperature of the outlet can be above 45°C and the total efficiency can reach 60%.

关键词： Solar panels

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Experiment of condensation in T-junction: Steam-water flow in water-injected condition 16

Experiment of condensation in T-junction: Steam-water flow i...

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16th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2015

作者： Ren, W.Y. Yu, G.J. Bian, J.W. Tian, W.X. Su, G.H. Qiu, S.Z. Fu, X.L. School of Nuclear Science and Technology State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiao Tong University No. 28 Xianning West Road Xi'an710049 China State Nuclear Power Software Development Center Beijing102206 China National Key Laboratory of Nuclear Power Software Beijing10226 China

ISBN: (纸本)9781510811843

Condensation of two-phase flow inside a tube within sub-cooled coolant injected show a complicated phenomenon which affects both the pressure drops from the upstream to downstream and the void fraction distribution in tube. This phenomenon always appears in the T-junction which kind of structure could be found in nuclear power plants design. The investigation about injection to two-phase flow in this structure can help us predict the hydrodynamic phenomenon of condensation heat transfer. Distribution of the fluid temperature and heat transfer coefficient (HTC) due to fluid-fluid mixing and steam condensation had been considered to be a significant process which is included in the pressurized thermal shock (PTS) research. Previous researches had built the integral effect test to analysis the effect of thermal mixing. However, the practical condensate process in T-junction injected is too hard to be predict accurately, which is contributed to the structure, the geometric dimension, the mass flow rate between the main and branch pipe, the flow patterns, the void fraction of two-phase flow, temperature of flow, pressure, etc. We analyzed the process of cooling water injecting from the branch pipe into a horizontal main pipe, and also focus on the phenomena of water injection in steam or different flow patterns. We had set some thermo couples inserting to the tube to keep observing the temperature field inside. The initial conditions of the experiment about the flow pattern before the injection includes stratified flow, wavy flow, annular flow and dispersed flow. We also took the heat dissipation between the test facility and surround into consideration. The experiment is a separate effect test program which based on the phenomena about condensation in T-junction with 45° incidence injection and progressed on ordinary pressure.

关键词： Two phase flow

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Investigation on heat transfer and hydraulic resistance characteristics of supercritical fluids in tubes

Investigation on heat transfer and hydraulic resistance char...

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International Conference on Power engineering, ICOPE 2015

作者： Li, Lin Chenhao, Fan Hongzhi, Li Hongfang, Gu Benan, Cai Haijun, Wang State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China National Engineering Research Center of Clean Coal Combustion Xi'an Thermal Power Research Institute Co. Ltd. Xi'an710032 China

Supercritical fluids have a wide range of applications in ultra-supercritical power units, water cooled reactors and aerospace fields with a good performance in flowing and heat transfer. When medium works in large specific-heat region, a dramatic change in physical properties of fluids occurs, resulting in a complicated change about the flow structure in tubes. In the present paper, the main conclusions are: At supercritical pressure, when the water works in large specific-heat region, the frictional resistance coefficient values decrease sharply, leading to a lower friction pressure drop and a smaller proportion in total pressure drop;simultaneously acceleration pressure drop values gradually increase. At low heat flux, the heat transfer coefficients are in good proportions to acceleration resistance coefficients. An appropriate increase in heat flux could effectively enhance the heat transfer coefficients. At high heat flux, being accompanied with heat transfer deterioration, a big velocity and viscosity gradient difference exist and laminarzation phenomenon occurs at the same time in tubes. The heat transfer mechanisms of supercritical water has been analyzed in this paper. Whether the heat transfer is improved or deteriorated primarily depends on the extent of the difference of physical properties of fluids in different radial positions. © 2015 The Japan Society of Mechanical Engineers.

关键词： Pressure drop

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Performance Evaluation of Heat Transfer Enhancement in Plate-fin Heat Exchangers with Offset Strip Fins

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Physics Procedia 2015年 67卷 543-550页

作者： Yang Yujie Li Yanzhong Si Biao Zheng Jieyu Institute of Refrigeration and Cryogenics Xi’an Jiaotong University Xi’an 710049 China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an 710049 China

Generally, the Offset Strip Fin (OSF) in a plate-fin heat exchanger provides a greater heat transfer coefficient than plain plate-fin, but it also leads to an increase in flow friction. A new parameter, called relative entropy generation distribution factor, Ψ * , is proposed to evaluate the thermodynamic advantages of OSFs. This parameter presents a ratio of relative changes of entropy generation. The relative effects of the geometrical parameters α, γ and δ are discussed. The results show that there exist the optimum values of α and γ at a certain flow condition, which obviously maximize the degree of the heat transfer enhancement of OSFs.

关键词： plate-fin heat exchanger offset strip fin heat transfer enhancement entropy generation constant wall temperature

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Theoretical Investigation on the Partial Load Feedwater Heating System with Thermal Vapor Compressor in a Coal-fired Power Unit

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Energy Procedia 2015年 75卷 1102-1107页

作者： Liu Jiping Han Wei Wang Xin Han Xiaoqu Chong Daotong Yan Junjie Moe Key Laboratory of Thermo-Fluid Science and Engineering Xi’an Jiaotong University Xi’an 710049 China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an 710049 China

When a coal-fired unit operates at a partial load, the decrease at regenerative steam pressure leads to a decrease in boiler feedwater temperature, affecting not only the thermal economical efficiency, but also the selective catalytic reduction (SCR) denitrification effect and the boiler combustion stability. A feedwater system with the thermal vapor compressor has been studied in the present paper. The high pressure regenerative steam is injected by the live steam to heat boiler feedwater to increase its temperature. Mathematical models of the thermal vapor compressor, boiler and turbine regenerative system are established to calculate the performance of a 660MW supercritical air cooling unit at a 60% load. It was found that although the energy-saving effect is small, it is positive to improve the SCR denitrification effect and stabilize the boiler combustion.

关键词： regenerative cycle thermal vapor compressor thermo-economical analysis

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Concentrating Solar Thermochemical Hydrogen Production by Biomass Gasification in Supercritical Water

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Energy Procedia 2015年 69卷 444-450页

作者： B. Liao L.J. Guo State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xianning West Road No.28 Xi’an Shaanxi 710049 China

Solar receiver reactor is the key component of supercritical water gasification of biomass using concentrating solar energy, and itsthermal performance directly affects the thermal efficiency and biomass gasification results. The temperature distributions of solar receiver reactor and reactant fluid are *** results showed that direct normal solar irradiation (DNI) have prominent effect on the temperature of cavity type solar receiver reactor, thus affecting the SCWG reaction behaviors and gasification results. A series of on-sun experiments were carried out,temperature is relatively stable withDNI small fluctuations, and the nominal fluid temperatures at the outlet of reactor varied in the range 500–650 o C, which could completely meet the need of the temperature for biomass gasification in supercritical *** compounds of biomass (ethylene glycol, ethanol,glycerin and glucose) were continuously gasified under SCW conditions to generate hydrogen-rich fuel gas in the apparatus. Gas yields, carbon gasification efficiency and the total gasification efficiency increase with increasing DNI. The range of GE and CE is 48.5-105.8%, 37.5-95.6%, *** thermal performance and gasification results show thatsolar receiver/reactor used in this study is one of the good configurations that can be used for SCWG of biomass using concentrating solar energy.

关键词： Solar receiver reactor thermochemical hydrogen production supercritical water gasification

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Research on Heat Recovery System of Turbine Exhaust Steam Using Absorption Heat Pump for Heating Supply Based on Heating Load Characteristics

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Energy Procedia 2015年 75卷 1502-1507页

作者： Jinshi Wang Kai Xia Weixiong Chen Ming Liu Datong Chong Jiping Liu Junjie Yan State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an 710049 China Moe Key Laboratory of Thermo-Fluid Science and Engineering Xi’an Jiaotong University Xi’an 710049 China

In order to improve the energy utilization efficiency of thermal power plants and to solve the heating shortage problem in China, the absorption heat pump is usually employed to recover the heat of turbine exhaust steam for heating supply. In the existing references, few researchers considered the heating load characteristics when designing the recovery system. In this paper, the design thought of heat recovery system of turbine exhaust steam using absorption heat pump for heating supply based on heating load characteristics was presented. With an engineering case, the heat recovery system was designed and its economic efficiency was calculated.

关键词： heating load heat pump heat recovery power

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