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Effects of Coal Blending and Operating Conditions on Combustion and NO x Emission Characteristics in a Tangentially-fired Utility Boiler

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Energy Procedia 2017年 105卷 4015-4020页

作者： Debo Li Qiang Lv Yongxin Feng Chang’an Wang Xuan Liu Kai Chen Kai Xu Jun Zhong Defu Che Electric Power Research Institute of Guangdong Power Grid Corporation Guangzhou 510080 China State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi’an Jiaotong University Xi’an 710049 China

The influences of operating conditions, such as excess air ratio and SOFA arrangement, on temperature distributions, species distributions, NO x emissions and burnout of a tangentially-fired utility boiler using bituminous and blended coal were investigated by numerical approach in the present study. The simulation results show that the fuel type exhibits certain effect on the temperature distributions and the NO x emissions. Moreover, higher excess air ratio could restrain the CO formation but promote NO x emission. The temperature and the species distributions are highly related to the SOFA arrangement. In addition, SOFA technology is still an effective approach to control the NO x emissions during blended coal combustion, while the disadvantageous effect on char burnout should be considered.

关键词： coal blending combustion NOx emission numerical simulation utility boiler

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Numerical Study on Combustion and Heat Transfer Properties Under Oxy-fuel Condition in a 600MW Utility Boiler

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Energy Procedia 2017年 105卷 4009-4014页

作者： Debo Li Xuan Liu Chang’an Wang Kai Xu Qiongliang Zha Qiang Lv Yongxin Feng Jun Zhong Defu Che Electric Power Research Institute of Guangdong Power Grid Corporation Guangzhou 510080 China State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi’an Jiaotong University Xi’an 710049 China

Oxy-fuel combustion is recognized as one of the most promising CO 2 capture technologies. Under oxy-fuel combustion, the concentrations of CO 2 and H 2 O are much higher, result in different temperature profiles and heat transfer properties. In this study, a modified computational fluid dynamics (CFD) model-was developed for a 600 MW tangentially-fired boiler. Different oxygen volume fractions and two flue gas recycle modes (dry recycle and wet recycle) were numerically investigated, focusing on the properties of combustion and heat transfer. The results indicate the peak temperature in the burner zone decreases in oxy-fuel combustion, because of the high heat capacity and chemical reactivity of CO 2 . Compared with air-fired combustion, similar total heat transfer rate in furnace can be achieved at 27.0% and 28.3% of oxygen volume fraction for wet and dry recycle. These findings indicate retrofitting an existing boiler with oxy-fuel combustion technology is entirely feasible.

关键词： oxy-fuel combustion WSGGM numerical simulation combustion properties heat transfer properties

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Corrigendum to “Experimental study of liquid sodium flow and heat transfer characteristics along a hexagonal 7-rod bundle” [Appl. Therm. Eng. 149 (2019) 578–587.]

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Applied Thermal Engineering 2019年 159卷

作者： Yandong Hou Liu Wang Mingjun Wang Kui Zhang Xisi Zhang Wenjun Hu Yingwei Wu Wenxi Tian Suizheng Qiu G.H. Su State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University 28 Xianning West Road Xi’an 710049 China Shaanxi Key Lab. of Advanced Nuclear Energy and Technology School of Nuclear Science and Technology Xi’an Jiaotong University 28 Xianning West Road Xi’an 710049 China China Institute of Atomic Energy P.O. Box 275-95 Beijing 102413 China

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Experimental study on thermal performance of a water/steam cavity receiver with solar simulator

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Energy Procedia 2017年 142卷 265-270页

作者： Zhenjie Wan Mumtaz A. Qaisrani Xuancheng Du Jinjia Wei Jiabin Fang Jian Zhang State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an 710049 People’s Republic of China School of Chemical Engineering and Technology Xi’an Jiaotong University Xi’an 710049 People’s Republic of China

The performance of cavity receiver plays a fatal role in light-heat conversion process in a concentrating solar power (CSP) plant. In our present work, an experimental platform is designed and built, in which a solar simulator consisting of seven mutually independent xenon lamp units is used for supplying the solar energy needed. The cold start-up and steady state performance of the cavity receiver were studied under 0.5MPa. The results show that for a certain cavity structure, temperatures on boiling panels and thus the heat loss can be affected not merely by the heat flux, other parameters can influence the temperature of absorbing surfaces, such as the heat transfer in the boiling tubes, fluid flow states and the wind effect, so the temperature distribution is highly non-uniform on boiling panels. However, the temperatures of passive surfaces depend greatly on the input solar energy, thus the heat losses of the passive surfaces will vary with the input energy. Overheat occurs if a high heat flux doesn’t have a sufficient heat transfer inside boiling tubes internal. The stagnation zone does exist in the cavity and its boundary varies with a different input energy, thus the convective heat loss can be affected. The cavity receiver thermal efficiency is 72.92% under 0.5MPa, may be the reason behind this low efficiency is the strong cooling wind of the solar simulator.

关键词： Solar energy central cavity receiver start-up thermal performance solar simulator thermal efficiency

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Layered sphere-shaped TiO_2 capped with gold nanoparticles on structural defects and their catalysis of formaldehyde oxidation

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Journal of Environmental Sciences 2016年第1期28卷 77-85页

作者： Chunyan Ma Guanglong Pang Guangzhi He Yang Li Chi He Zhengping Hao Department of Environmental Nano-materials Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Department of Environmental Science and Engineering State Key Laboratory of Multiphase Flow in Power EngineeringSchool of Energy and Power Engineering Xi'an Jiaotong University

We describe here a one-step method for the synthesis of Au/TiO2 nanosphere materials,which were formed by layered deposition of multiple anatase TiO2 *** Au nanoparticles were stabilized by structural defects in each TiO2 nanosheet,including crystal steps and edges,thereby fixing the Au-TiO2 perimeter *** transfer occurred along the gaps between these TiO2 nanosheet layers and in contact with catalytically active sites at the Au-TiO2 *** doped Au induced the formation of oxygen vacancies in the Au-TiO2 *** vacancies are essential for generating active oxygen species（-＊O^-） on the TiO2 surface and Ti^3＋ ions in bulk *** ions can then form Ti^3＋-O^--Ti^4＋species,which are known to enhance the catalytic activity of formaldehyde（HCHO） *** studies on structural and oxygen vacancy defects in Au/TiO2 samples provide a theoretical foundation for the catalytic mechanism of HCHO oxidation on oxide-supported Au materials.

关键词： Layered Au/TiO2 nanospheres Structural defects Oxygen vacancy defects Reaction mechanism Formaldehyde oxidation

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Inuence of Nozzle Type on Spray Characteristics and Surface Heat Transfer in Cryogen Spray Cooling

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Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics 2017年第12期38卷 2646-2650页

作者： Wang, Rui Yang, Tao Zhou, Zhi-Fu Chen, Bin Wang, Guo-Xiang State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

Cryogen spray cooling has been applied to protect epidermis from thermal damage in laser dermatology. However, present clinical application suffers insufficient cooling capacity and non-uniform surface cooling. In present paper, the comparison research of nozzle type is conducted to investigate its influence on spray characteristics and surface heat transfer in cryogen spray cooling. The results show that the substitution of expansion-chambered nozzle or two-phase nozzle may improve therapy outcomes for their high cooling efficiency and precise cooling control. © 2017, Science Press. All right reserved.

关键词： Cooling

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Impressive computational acceleration by using machine learning for 2-dimensional super-lubricant materials discovery

arXiv

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arXiv 2019年

作者： Fronzi, Marco Ghazaleh, Mutaz Abu Isayev, Olexandr Winkler, David A. Shapter, Joe Ford, Michael J. International Research Centre for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an Shaanxi710049 China School of Mathematical and Physical Science University of Technology Sydney UltimoNSW2007 Australia Laboratory for Molecular Modeling Division of Chemical Biology and Medicinal Chemistry UNC Eshelman School of Pharmacy University of North Carolina Chapel HillNC27599 United States Manufacturing Commonwealth Scientific and Industrial Research Organization Bag 10 Clayton South MDCVIC3169 Australia Monash Institute of Pharmaceutical Sciences Monash University 381 Royal Parade ParkvilleVIC3052 Australia Latrobe Institute for Molecular Science La Trobe University Kingsbury Drive BundooraVIC3086 Australia School of Pharmacy University of Nottingham NottinghamNG7 2RD United Kingdom Australian Institute for Bioengineering and Nanotechnology University of Queensland St Lucia BrisbaneQLD4072 Australia College of Science and Engineering Flinders University Bedford Park AdelaideSA5042 Australia

The screening of novel materials is an important topic in the field of materials science. Although traditional computational modelling, especially first-principles approaches, is a very useful and accurate tool to predict the properties of novel materials, it still demands extensive and expensive state-of-the-art computational resources. Additionally, they can be often extremely time consuming. We describe a time and resource efficient machine learning approach to create a large dataset of structural properties of van der Waals layered structures. In particular, we focus on the interlayer energy and the elastic constant of layered materials composed of two different 2-dimensional (2D) structures, that are important for novel solid lubricant and super-lubricant materials. We show that machine learning models can recapitulate results of computationally expansive approaches (i.e. density functional theory) with high accuracy. Copyright © 2019, The Authors. All rights reserved.

关键词： Large dataset

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Coupled neutronics/thermal-hydraulics and safety characteristics of liquid-fueled Molten Salt Reactors

Coupled neutronics/thermal-hydraulics and safety characteris...

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作者： Qiu, S. Zhang, D. Liu, L. Liu, M. Xu, R. Gong, C. Su, G.H. State Key Laboratory of Multiphase Flow in Power Engineering School of Nuclear Science and Technology Xi'an Jiaotong University Xi'an710049 China

Molten salt reactor (MSR) as one candidate of the Generation IV advanced nuclear power systems is attracted more attention in China due to its top ranked fuel cycle and thorium utilization. The MSRs are characterized by using liquid-fuel, which offers complicated coupling problem of neutronics and thermal hydraulics. In this paper, the fundamental model and numerical method are established to calculate and analyze the safety characteristics for liquid-fuel MSRs. The theories and methodologies are applied to the MOSART concept. The liquid-fuel flow effects on neutronics, reactivity coefficients and three operation parameters' influences at steady state are obtained, which provide the basic information for safety analysis. The unprotected loss of flow transient is calculated, the results of which shows the inherent safety characteristics of MOSART due to its strong negative reactivity feedbacks. © Carl Hanser Verlag, München.

关键词： Molten salt reactor

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Assessing the predictions of A NOx kinetic mechanism on recent hydrogen and syngas experimental data 9

Assessing the predictions of A NOx kinetic mechanism on rece...

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9th International Conference on Modeling and Diagnostics for Advanved Engine Systems, COMODIA 2017

作者： Zhang, Yingjia Mathieu, Olivier Petersen, Eric Bourque, Gilles Li, Qianqian Curran, Henry Huang, Zuohua State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China Combustion Chemistry Centre National University of Ireland Galway Ireland Department of Mechanical Engineering Texas A and M University College StationTX United States Siemens Canada Limited 9545 Cote de Liesse Road MontrealQCH9P 1A5 Canada

A detailed chemical kinetic mechanism has been developed to describe the pyrolysis and oxidation of the hydrogen/NOx and syngas/NOx systems. The thermodynamic data of nitrogenous compounds have been updated based on t... 详细信息

关键词： Hydrogen

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Sodium-Ion Batteries: Carbon-Based Alloy-Type Composite Anode Materials toward Sodium-Ion Batteries (Small 22/2019)

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Small 2019年第22期15卷

作者： Guorui Yang P. Robert Ilango Silan Wang Muhammad Salman Nasir Linlin Li Dongxiao Ji Yuxiang Hu Seeram Ramakrishna Wei Yan Shengjie Peng Department of Chemistry School of Science Xi'an Jiaotong University Xi'an 710049 P. R. China Department of Environmental Science & Engineering State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China Department of Mechanical Engineering National University of Singapore Singapore 117574 Singapore Jiangsu Key Laboratory of Electrochemical Energy Storage Technologies College of Materials Science and Technology Nanjing University of Aeronautics and Astronautics Nanjing 210016 China Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Nankai University Tianjin 300071 China Nanomaterials Centre School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology The University of Queensland QLD 4072 Australia

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