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Experimental Study on the Molten Salt at Micron Scale during the Melting Process

Journal of Thermal Science 2024年第1期33卷 70-85页

作者： TIAN Ziqian LIAO Zhirong XU Chao FANG Yongzhe jiang kaijun YUAN Mengdi Key Laboratory of Power Station Energy Transfer Conversion and System Ministry of Education of ChinaSchool of Energy Power and Mechanical EngineeringNorth China Electric Power UniversityBeijing 102206China

The investigation of the melting behaviors of the molten salt at micron scale during the melting process is critical for explaining the solid-liquid phase transition *** this paper,a novel experimental system and analysis method were proposed to study the melting process with three heating rates in the range of1-10℃/min of the solar salt at micron *** solid-liquid boundary morphology and phase transition kinetics of molten salt particles were focused ***,the correlations between liquid fraction,temperature and time under different heating rates were *** solid-liquid boundary morphology was depicted by the visualized experimental set-up,and the instantaneous liquid volume fraction during the non-isothermal phase transition was ***,the correlation between temperature and liquid volume fraction was proposed to reveal the evolution of the solid-liquid boundary with temperature at different heating ***,the non-isothermal phase transition kinetic equation was established by introducing a constant parameter(V_(a,b)),and more kinetic parameters such as 1g V_(a,b) and-lg V_(a,b)/b were *** results showed that the exponent b is not sensitive to the heating rate with a range of 3-5 for solar salt ***,the heating rate influences the value of V_(a,b) and presents a positive ***,the non-isothermal phase transition kinetic equations at different heating rates in the range of 1-10℃/min can be quickly predicted by the proposed improved experimental test *** study could fill the research insufficiency and provide significant guidance for future research on the solid-liquid transition mechanism of molten salts at micron scale.

关键词： molten salt non-isothermal phase transition solid-liquid boundary morphology liquid volume fraction micron scale melting process

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Experimental Investigation on the Hydrodynamic Characteristics of Fluidized Bed Particle Solar Receiver with Gas-Solid Countercurrent Flow Pattern

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Journal of Thermal Science 2021年第6期30卷 2241-2253页

作者： jiang kaijun WANG Fengli KONG Yanqiang XU Chao DU Xiaoze MOE Key Laboratory of Power Station Energy Transfer Conversion and System North China Electric Power UniversityBeijing 102206China School of Energy and Power Engineering Lanzhou University of TechnologyLanzhou 730050China

To design a particle solar receiver(PSR),a vital energy conversion system,is still a bottleneck for *** study presents a novel PSR based on countercurrent fluidized bed(CCFB)technology,named CCFB *** this design,downward-moving particles are subjected to the action of an up-flow gas to reduce the falling speed and enhance the radial disturbance,and hence increase the residence time of particles and improve the heat transfer.A cold-mold visual experimental setup is *** influence factors are investigated experimentally,including the superficial gas velocity,solid flux,aeration gas,particle size and transport tube *** results indicate that the maximum solid holdup can exceed 9%or so with fine particles of diameter d_(p)=113.5 μm and a tube diameter of 40 *** is proved that the CCFB can operate stably and adjust the solid flux *** results of this study provide a new structure for PSRs in the concentrated solar power field and could fill the research insufficiency in the gas-solid counterflow field.

关键词： particle solar receiver gas-solid two-phase flow countercurrent fluidized bed solid holdup

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Characteristics of Axial and Radial Development of Solids Holdup in a Countercurrent Fluidized Bed Particle Solar Receiver

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Journal of Thermal Science 2021年第6期30卷 2223-2240页

A novel particle solar receiver(PSR)with gas-solids countercurrent fluidized bed(CCFB)was *** cold-mold prototype was set up to investigate the gas-solids flow structure by using optical fiber *** local solids holdup distribution,its evolution with various operating conditions and the fluctuations of the local flow structures were investigated *** results show that the novel CCFB can achieve much higher solids holdup(~9%)compared to the traditional downer ones(~l%).The solid particles are mainly distributed in the near-wall region and the particles are more difficult to get a fully developed state in the near-wall *** excellent gas-solids mixing and contacting demonstrated by the standard deviation and intermittency index means a better wall-to-bed heat transfer *** distribution of the solid particles in the CCFB transport tube is revealed,which can provide a significant reference for the structure design of the hot-mold ***,the research can fill in the research gap in the gas-solids counterflow field.

关键词： concentrated solar power particle solar receiver countercurrent fluidized bed optical fiber probe local solids holdup

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Water Resource Development in the Quaternary Ryukyu Limestone Regions of Japan:Application of the GIS to the Site Selection of Underground Dams

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Acta Geologica Sinica(English Edition) 2001年第3期75卷 254-259页

作者： kaijun jiang Hiroyasu FURUKAWA Yuji ONOYAMA Testuro ESAKI Underground Dam Research Group Showa-chika Kogyo Inc. Fukuoka Japan 815-0082Underground Dam Research Group Showa-chika Kogyo Inc. Fukuoka Japan 815-0082Underground Dam Research Group Showa-chika Kogyo Inc. Fukuoka Japan 815-0082Institute of Environmental Systems Kyushu University Fukuoka Japan 812-8581

Based on the natural and social conditions as well as hydrogeological characteristics of the Ryukyu limestone, a major aquifer in the Ryukyu Islands, a conception of underground dam, was proposed in the early 1970s in order to develop ground water resources in the Quaternary Ryukyu limestone regions of Japan. The practice of nearly thirty years has shown that the underground dam is an environment-friendly and effective way for developing ground water in these regions.

关键词： underground dam limestone Quaternary GIS ground water

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Radio-frequency spectroscopic measurement for pairing gap in an ultracold Fermi gas

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Science China(Physics,Mechanics & Astronomy) 2013年第3期56卷 581-587页

作者： jiang kaijun LUO Hua LI Kai ZHANG DongFang GAO TianYou PENG ShiGuo State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and MathematicsChinese Academy of Sciences

The study of ultracold Fermi gases has exploded a variety of experimental and theoretical research since the achievement of degenerate quantum gases in the lab,which expands the research range over atomic physics,condensed matter physics,astrophysics and particle *** the Feshbach resonance,one can tune the attractive two-body interaction from weak to strong and thereby make a smooth crossover from the BCS superfluid of cooper pairs to the Bose Einstein condensate of bound *** this crossover regime,the pairing effect plays a significant role in interpreting the interaction *** the localized or delocalized pairing occurs at sufficiently low temperature,the single-particle energy will shift with respect to free atoms,due to the two-body or many-body *** the pairing gap can improve the understanding of the thermodynamics and hydrodynamics of the phase transition from the pseudogap to the superfluid,which will make an analogue to the high-temperature superconductivity in condensed *** this work,we will give a brief introduction to a novel radio-frequency(RF) spectroscopic measurement for pairing gap in an ultracold Fermi gas,which is currently widely used on the ultracold atomic table in the *** different interaction regimes of the BEC-BCS crossover,ultracold atoms are excited with a RF pulse and the characteristic behavior can be extracted from the spectrum.

关键词： degenerate Fermi gas Feshbach resonance Bose Einstein condensate superfluid

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支撑我国能源转型的灵活燃煤发电新技术:燃煤耦合储能系统及智能控制系统

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中国电机工程学报 2024年第17期44卷 6855-6882,I0013页

作者：刘吉臻王庆华张效宁牛玉广徐进良余雄江江凯军谢剑王艳北京怀柔实验室北京市怀柔区101400

我国清洁低碳安全高效的能源体系正逐步建立,以新能源为主体的新型电力系统对燃煤发电机组的灵活运行与优化调控提出了更严格的要求。燃煤发电机组耦合储能系统是提升机组调峰能力与支撑水平的有效途径。灵活运行为智能控制赋予现实需求... 详细信息

我国清洁低碳安全高效的能源体系正逐步建立,以新能源为主体的新型电力系统对燃煤发电机组的灵活运行与优化调控提出了更严格的要求。燃煤发电机组耦合储能系统是提升机组调峰能力与支撑水平的有效途径。灵活运行为智能控制赋予现实需求,智能控制为灵活的实现提供技术支撑,发展智能控制系统是提升机组调峰能力与支撑水平的着手点。该文梳理灵活燃煤发电中燃煤耦合储能系统及控制系统的研究进展,对比各类燃煤耦合储能系统的特征、应用领域与存在问题,同时阐述燃煤发电机组控制系统智能化建设中状态检测、自动控制、运行优化等应用中感知、分析、决策、控制各环节的现状与挑战。分别从储能系统中熔盐储热热力系统重构、关键部件设计、非电伴热3个层面,以及智能控制系统泛在感知、智能控制与智能运行3个层面归纳出支撑我国能源转型的灵活燃煤发电新技术,并对燃煤发电机组未来的发展方向进行展望,可为燃煤发电机组的灵活性运行和智能化建设提供一定参考。

关键词：燃煤发电机组灵活运行储能系统智能控制

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Numerical analysis of the effects of subgrade settlement on top-down cracking in epoxy asphalt pavement

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Science China Technological Sciences 2024年第10期67卷 3308-3320页

作者： jiang XiuJie HUANG Wei LUO Sang WEI Ya KONG WeiYi DU kaijun School of Transportation Southeast University Intelligent Transportation System Research Center Southeast University Department of Civil Engineering Tsinghua University Nanjing Modern Multimodal Transportation Laboratory

Epoxy asphalt pavement cracking caused by subgrade settlement is detrimental to the long-term safe service of roads. A threedimensional finite element model of epoxy asphalt pavement is established to investigate the effects of subgrade settlement on the propagation of top-down cracking(TDC). The contour integral method is utilized to calculate the stress intensity factor(SIF)at the crack tip, and then the extended finite element method(XFEM) is used to analyze the propagation behavior of TDC under combined subgrade settlement and traffic loading. The results of these analyses indicate that increased subgrade settlement,stiffer surface layers, and softer bases will increase the SIF, resulting in a faster crack propagation rate. It is suggested that the use of epoxy asphalt materials in pavement structures can allow more subgrade settlement than conventional asphalt ***, when the base layer modulus is higher than 12500 MPa, the increase in surface modulus can decrease crack propagation length. Sensitivity analysis results demonstrate that subgrade settlement has the most significant impact on TDC propagation. The conclusions of this study are expected to provide a theoretical basis for crack prevention in the design and maintenance of pavement structures.

关键词： epoxy asphalt pavement subgrade settlement XFEM stress intensity factor crack propagation

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Chemical profiling of principle active and toxic constituents in herbs containing aristolochic acids

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Chinese Herbal Medicines 2024年第2期16卷 293-300页

作者： Lijun Yue kaijun Yang Feng jiang Shuai Dong Kang Yang Dan Zhu School of Pharmacy Minzu University of ChinaBeijing 100081China Key Laboratory of Ethnomedicine Ministry of Education Minzu University of ChinaBeijing 100081China Hospital of Minzu University of China Beijing 100081China

Objective:To clear the amounts of the principal active/toxic components in herbs containing aristolochic acids(HCAAs),which are still used as medicine and/or seasoning in many ethnic minority areas of ***:In this study,six major active and toxic components in HCAAs were extracted with ultrasonic *** 6-O-methyl guanosine as internal standard,the target compounds were analyzed qualitatively and quantitatively by using ultrahigh performance liquid chromatography-electrospray ionization-tandem mass spectrometry(UPLC-ESI-MS/MS)with multiple reaction monitoringinformation dependent acquisition-enhanced production ion scanning mode(MRM-IDA-EPI)combined with dynamic background subtraction(DBS)***:The method showed good linearity in the linear range of the six *** limit range of detection was from 0.01 ng/mL to 0.27 ng/*** of the detection repeatability,extraction repeatability and accuracy of the method were *** extraction,the samples remained stable at 15℃ within 24 *** analytes were all found in samples except aristolactam(AL)in sample 2,and the contents varied *** contents of these compounds decreased in fruits,leaves and stems of Aristolochia delavayi ***:This method has the advantages of less sample dosage,simple operation,short analysis cycle,high sensitivity,specificity and *** laid a good foundation for guiding the safety of HCAAs,the indepth study of pharmacological and toxicological effects and the scientific and standardized processing and compatibility of HCAAs.

关键词： aristolactam aristolochic acids chemical profiling herbs containing aristolochic acids ultrahigh performance liquid chromatography-electrospray ionizationtandem mass spectrometry(UPLC-ESI-MS/MS)

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Radio-frequency spectroscopic measurement for pairing gap in an ultracold Fermi gas

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Science China Chemistry 2013年第3期56卷 581-587页

关键词： degenerate Fermi gas Feshbach resonance Bose Einstein condensate superfluid

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开井期间抽汲求产对压恢曲线试井分析的影响

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油气井测试 2005年第5期14卷 25-28页

作者：张雁蒋凯军大庆油田有限责任公司试油试采分公司黑龙江大庆163412

抽汲求产是一个很复杂的间歇生产过程,对应的压力恢复曲线试井解释方法有别于自喷井定产量模型,尤其当抽汲周期产量波动较大时,解释结果往往将产生较大误差。经研究分析发现,如果开井期间根据抽汲周期实测产量变化情况划分多个流动段,... 详细信息

抽汲求产是一个很复杂的间歇生产过程,对应的压力恢复曲线试井解释方法有别于自喷井定产量模型,尤其当抽汲周期产量波动较大时,解释结果往往将产生较大误差。经研究分析发现,如果开井期间根据抽汲周期实测产量变化情况划分多个流动段,即采用自喷井变产量迭加方法对压力恢复曲线进行拟合分析,则可以近似模拟抽汲求产情况,降低解释误差。经两口井资料处理,均获得较好效果,解决了以往采用自喷井单流量模型解释明显不合理的问题,达到了准确评价储层的目的。

关键词：测试抽汲压力恢复曲线试井分析误差压力恢复曲线抽汲试井分析开井间歇生产过程产量模型试井解释方法自喷井拟合分析

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