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Experimental Research on the Performance of Exhaust Steam Reclaim Device With a Swirling flow Vane

AIP Conference Proceedings 2010年第1期1207卷 374-379页

作者： X. L. Li J. J. Yan P. F. Zhang J. J. Yang J. P. Liu State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University P.R. China

This paper experimentally studied the performance of exhaust steam reclaim device with a swirling flow vane at different inlet water pressures, temperatures, different inlet steam pressures and different distances between the throat and spout. The results indicated that the injection coefficient decreased as the inlet water pressure and temperature increased, respectively. There is a best distance between the throat and spout which makes the injection coefficient reached to its maximal value at the same experimental pressure and temperature, and the value equals to 130 mm in our experimental system. The resistance coefficient has a minimum value which makes the device have the highest outlet water pressure. Compared with the device without a swirling flow vane, it improves the heating performance for higher injection coefficient and exergy efficiency.

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A novel coal-fired chp system integrated with steam ejectors to realize heat-power decoupling and energy saving

A novel coal-fired chp system integrated with steam ejectors...

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2019 Canadian Society for Civil engineering Annual Conference, CSCE 2019

作者： Liu, Miaomiao Liu, Ming Zhao, Shuran Song, Gege Yan, Junjie State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China Key Laboratory of Heat Transfer enhancement and Process Energy Conservation Technology Ministry of education Beijing University Beijing100025 China

ISBN: (纸本)9780791883747

Traditional combined heat and power (CHP) units should run in the heat-controlled mode. The adjustable range of power load is restricted by the heat load, and the minimum power load increases with the heat load. Because of high penetration of intermittent renewable power, operational flexibility of CHP units is highly required. It is necessary to adopt some technical solutions to realize heat-power decoupling for CHP units. To find a heat-power decoupling method with low investment and high energy efficiency, the steam ejectors, simple in structure and low in cost, are applied to design a novel heat-power decoupling system in this study. Steam ejectors can recover the waste heat of exhaust steam of steam turbines. Therefore, the integration of steam ejector may realize heat-power decoupling and energy saving simultaneously. Three heat-power decoupling systems with steam ejectors are designed. The heat-power decoupling performance and energy consumption characteristics of these systems are investigated with a reference 330 MW coal-fired CHP unit. Results show that all three modified systems can realize heat-power decoupling. The heat-power decoupling performance of improved system III is the best, and improved system I has the least coal consumption rate for power generation. Copyright © 2020 ASME.

关键词： Thermal load

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Pool boiling heat transfer on ultra-light porous metal foam surfaces

Pool boiling heat transfer on ultra-light porous metal foam ...

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2013 International Conference on Materials for Renewable Energy and Environment, ICMREE 2013

作者： Ji, Xianbing Xue, Qiang Xu, Jiliang Xu, Jia State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing China Beijing Key Laboratory of Multiphase Flow and Heat Transfer North China Electric Power University Beijing China

ISBN: (纸本)9781479933365

Experiments were conducted to study pool boiling heat transfer on ultra-light porous metal foam surfaces, with deionized water as working fluid. The metal foams have pore densities from 30 to 60ppi (pores per inch) and thickness from 2.0 to 5.0mm. The effects of heat flux, surface superheat, liquid temperature and characteristic parameters of metal foam on pool boiling heat transfer were investigated. It is found that metal foam surfaces can significantly enhance pool boiling heat transfer and lower the surface superheat at the boiling incipience. Pore density and thickness exists an optimal value to strengthen boiling heat transfer. The boiling heat transfer coefficient on the metal foam surfaces is about 2∼3 times of those on the plain surfaces. The significant reasons are due to the distinct nature of high porosity and multi-scale pore sizes of metal foams. The larger pores help to release the created vapor while the smaller pores help to suck the liquid toward the heater surface, decreasing the shear stress at the vapor-liquid interface for the counter-current flow. © 2013 IEEE.

关键词： Heat transfer

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Heat transfer behaviors of some supercritical fluids: A review

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Chinese Journal of Aeronautics 2022年第1期35卷 290-306页

作者： Gongnan XIE Xiaoxiao XU Xianliang LEI Zhouhang LI Yong LI Bengt SUNDEN School of Marine Science and Technology Northwestern Poly technical UniversityXi'an 710072China Key Laboratory of Low-grade Energy Utilization Technologies and Systems Chongqing UniversityChongqing 400044China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong UniversityXi'an 710049China State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Kunming University of Science and TechnologyKunming 650093China School of Mechanical Engineering Northwestern Polyteclwical UniversityXi'an 710072China Department of Energy Sciences Lund UniversitySE-22100 LundSweden

Supercritical fluids(e.g.,hydrocarbon fuels,water,carbon dioxide,and organic working medium,etc)have been recognized as working media to improve thermal efficiencies in power cycles and energy conversion,and have been used or selected as the working fluids in engineering fields such as aerospace,nuclear power,solar energy,refrigeration,geothermal energy,chemical technology,and so *** better understand the interesting characteristic or abnormal behaviors of supercritical fluids,most valuable research works(including experimental results and numerical studies)from domestic and abroad have been *** such,this paper presents a comprehensive review on heat transfer behaviors of some supercritical fluids in engineering *** review focuses on recently available articles published mainly from 2016 up to the present *** common problems(i.e.,heat transfer enhancement and heat transfer deterioration particularly for the supercritical hydrocarbon fuels)in the supercritical field are summarized and some perspectives on future prospects are also included.

关键词： Heat transfer behavior Supercritical fluids Thermo-physical property Turbulence model Working condition

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A bundle CHF mechanism model and its preliminary verification under PWR conditions 18

A bundle CHF mechanism model and its preliminary verificatio...

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

作者： Liu, Yang Shan, Jianqiang Zhang, Bo Liu, Wei State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University No. 28 Xianning West Road Xi'an Shaanxi Province710049 China Nuclear Power Institute of China State Key Laboratory of System Desgin Technology Chengdu Sichuan Province610213 China

A bundle mechanistic model to predict critical heat flux (CHF) over a pressurized water reactor (PWR) operating range in flow boiling has been proposed based on a concept of the bubble crowding in the wall bubbly layer. The new bundle mechanistic model has the following differences with the original tube model proposed by Weisman & Pei. Firstly,the radial velocity distribution within the bundle was used to derive the radial turbulence intensity factor ib instead of the velocity distribution inside the tube. Secondly, a grid enhancement factor was introduced to quantify the effect of grid on CHF enhancement, based on the measurement experiment of the turbulence intensity factor ib with grid. Thirdly, for the turbulence intensity factor ib, the new model considers the influence of pressure and mass flow rate under two phases, and the original ib only considers the influence of mass flow rate. Finally, the new established bundle CHF mechanism model was verified by comparing with the typical PWR CHF data. © 2019 American Nuclear Society. All rights reserved.

关键词： Heat flux

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Development of a thermal-mechanical-material behavior analysis code for the dispersion-plate-type fuel 16

Development of a thermal-mechanical-material behavior analys...

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

作者： Wu, Yingwei Lu, Qing Deng, Yangbin Zhang, Dalin Tian, Wenxi Qiu, Suizheng Su, Guanghui State Key Laboratory of Multiphase Flow in Power Engineering School of Nuclear Science and Technology Xi'an Jiaotong University Xi'an710049 China Department of Nuclear Engineering Xi'an Jiaotong University Xi'an710049 China

ISBN: (纸本)9781510811843

In this study, the relevant thermal-hydraulic, mechanic-material and burnup effect calculation models were established. On the basis of these mathematic and physic models, a thermal- mechanic-material coupling analysis code for a dispersion-plate-type fuel assembly was independently developed with the consideration of the burnup effects. The coupling program was applied to perform the thermal-mechanical-material behavior analysis of a dispersion-plate-type fuel assembly. Major physical parameters at different burnup stages were well predicted, including flux distribution, temperature profile, Mises stress and mechanic deformations. The result shows that geometric sizes of flow channels are the key parameters determining the coolant flux distribution and the temperature profile of the edge plate presents substantial asymmetry as a result of asymmetric heat transfer caused by the asymmetric geometry. Furthermore, the equivalent stress of base material increased rapidly with burnup because of the thermal expansion and burnup effects, which resulted in substantial plastic deformation and mechanical damage. In addition, the mechanism and process of blistering was investigated for blistering prediction. The result shows that due to the increasing fission gas pressure and the deteriorating yield stress of the cladding, fuel plate blistering may happen when the burnup depth up to a certain value and fuel plate will finally fall into failure as a result of over plastic deformation.

关键词： Plastic deformation

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Study on Variable Condition of Large Temperature Differential Heating System With Integrated Ejector Heat Pump

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2022年第4期43卷 863-869页

作者： Wang, Li-Yuan Liu, Ji-Ping Fu, Yue Liu, Ming Yan, Jun-Jie Key Laboratory of Heat Flow Science and Engineering of Ministry of Education Xi'an Jiaotong University Xi'an710049 China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

In the case of increasing urban heating demand, reducing the return water temperature of primary heating network can improve the heating capacity and utilize and recycle low-temperature waste heat resources. The ejector heat pump can use the high temperature heat source of the primary heat network to reduce the temperature of the return water, it has the advantages of simple structure, stable and reliable operation. In this paper, a model of ejector heat pump system is established to study the variable operating conditions of ejector heat pump system under central heating regulation. The results show that the ejector heat pump can effectively reduce the primary heat network return water temperature, and the primary network return water temperature can be reduced by 22 degree centigrade under the same primary network water supply temperature. With the increase of water supply temperature of primary network, the temperature of primary network return water, COP of the heat pump system and ejector ejection ratio increase gradually, the exergy efficiency decreases gradually. In the process of heating regulation, with the increases of outdoor temperature, the primary network return water temperature increases continuously, and the exergy efficiency decreases gradually;However, when the outdoor temperature is lower than the local design temperature, the ejector ejection ratio and the COP of the heat pump system decrease sharply. © 2022, Science Press. All right reserved.

关键词： Water temperature

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Comparative analysis on gas–solid drag models in MFIX-DEM simulations of bubbling fluidized bed

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Chinese Journal of Chemical engineering 2023年第12期64卷 64-75页

作者： Ruiyu Li Xiaole Huang Yuhao Wu Lingxiao Dong Srdjan Beloševic Aleksandar Milicevic Ivan Tomanovic Lei Deng Defu Che State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power EngineeringXi’an Jiaotong UniversityXi’an 710049China Shunde Institute of Inspection Guangdong Institute of Special Equipment Inspection and ResearchFoshan 528300China Department of Thermal Engineering and Energy "VINCA" Institute of Nuclear Sciences–National Institute of the Republic of SerbiaUniversity of BelgradeMike Petrovica Alasa 12-1411351 VincaPO Box 52211001 BelgradeSerbia

In this study,the open-source software MFIX-DEM simulations of a bubbling fluidized bed(BFB)are applied to assess nine drag models according to experimental and direct numerical simulation(DNS)*** influence of superficial gas velocity on gas–solid flow is also *** results show that according to the distribution of time-averaged particle axial velocity in y direction,except for Wen–Yu and Tenneti–Garg–Subramaniam(TGS),other drag models are consistent with the experimental and DNS *** the TGS drag model,the layer-by-layer movement of particles is observed,which indicates the particle velocity is not correctly *** time domain and frequency domain analysis results of pressure drop of each drag model are *** is recommended to use the drag model derived from DNS or fine grid computational fluid dynamics–discrete element method(CFD-DEM)data first for CFD-DEM *** the investigated BFB,the superficial gas velocity less than 0.9 m·s^(-1) should be adopted to obtain normal hydrodynamics.

关键词： MFIX-DEM Simulation Dense flow Gas-solid Bubbling fluidized bed Drag model

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Simulations of ECC safety injection for single phase and stratified phase flow 16

Simulations of ECC safety injection for single phase and str...

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

作者： Wang, Kai Cai, Rong Ren, Wuyue Qiu, Suizheng Tian, Wenxi Su, G.H. Chen, Ronghua School of Nuclear Science and Technology State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiao Tong University Xianning West Rd. 28 Xi'an Shaanxi710049 China

ISBN: (纸本)9781510811843

ECC safety injection nozzles are usually placed at the primary circulation pipelines as for the Gen II-plus nuclear reactor. Small Break Loss of Coolant Accident (SBLOCA) may lead to Pressurized Thermal Shock (PTS) on the Reactor Pressure Vessel (RPV) wall. Based on the Emergency Core Cooling (ECC) of a 2nd generation plus PWR, the CFD software CFX was adopted to simulate the thermal mixing phenomenon of the sub-cooled water from safety injection nozzle and high temperature water or steam from the cold leg which later forms into stratified flow. Also the steam-water simulation takes the steam condensation into consideration and steam condensation is characterized by a relatively large interfacial area between the two phases. For simulations of single-phase thermal mixing, the temperature profiles of different points were obtained and agreed well with the experiment. For steam mixing with water, the gas volume profile and the condensation rate of the steam were obtained and compared with the experiment, and the effect of different injection nozzle water velocities were also studied.

关键词： Steam

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A kinetics and dynamics study on the auto-ignition of dimethyl ether at low temperatures and low pressures 38th

A kinetics and dynamics study on the auto-ignition of dimeth...

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38th International Symposium on Combustion, 2021

作者： Huang, Wenlin Zhao, Qian Huang, Zuohua Curran, Henry J. Zhang, Yingjia State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China Combustion Chemistry Centre School of Chemistry Ryan Institute MaREI Nui Galway Ireland

Dimethyl ether (DME)/air mixtures at various equivalence ratios from lean (0.5) to extremely rich (5.0) were ignited behind reflected shock waves at a fixed pressure (3.0 atm) over the temperature range 625 K– 1200 K. The ignition behavior was different from that at high-pressures, with a repeatable ignition delay time fall-off feature observed experimentally in the temperature transition zone from the negative temperature coefficient (NTC) regime to the high-temperature regime. The fall-off behavior showed strong equivalence ratio dependence and disappeared completely at an equivalence ratio of 5.0. A local ignition kernel postulate was implemented numerically to quantifiably examine the inhomogeneous premature ignition. At low temperature, no pre-ignition occurs in the mixture. A conspicuous discrepancy was observed between the measurements and constrained UV simulations at temperatures beyond the NTC regime. A third O₂ addition reaction sub-set was incorporated into AramcoMech 3.0, together with related species thermochemistry calculated using the G3/G4/CBS-APNO compound method, to explore the low-temperature deviation. The new reaction class did not influence the model predictions in IDT, but the updated thermochemistry does. Sensitivity analyses indicated that the decomposition of hydroperoxy-methylformate plays a critical role in improving the low-temperature oxidation mechanism of DME.

关键词： Ethers

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