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arXiv 2018年

作者： Chen, Xiao Jiang, Ming Zhou, Qiang School of Chemical Engineering and Technology Xi'an Jiaotong University Xi'an710049 China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

The drift velocity has been proven to have significant relevance to the filtered Eulerian drag force by numerous correlative analyses of fully resolved simulations. It is a sub-grid quantity defined as the difference between the filtered gas velocity seen by the particle phase and the resolved filtered gas velocity. In literature, it is shown that various algebraic models for the drift velocity fail to give entirely satisfactory prediction of the filtered drag force. Unlike previous works, we theoretically derived the transport equation for the drift velocity from the standard two-fluid model (TFM) equations without any additional assumptions. The new approach, though requires additional closures for the new unresolved terms, is believed to have the potential to improve the precision of the estimation of this sub-grid quantity and hence give better prediction of the filtered drag force for gas-solid fluidization problems. Copyright © 2018, The Authors. All rights reserved.

关键词： Drag

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Theoretical investigation on heat-electricity decoupling technology of low-pressure steam turbine renovation for CHPs

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IOP Conference Series: Earth and Environmental Science 2019年第4期227卷

作者： Qingbo Hu Kun Wang Li Zhang Liansheng Zhou Rong Chen Shan Wang Yu Zhang Guohao Li Tianjin Electric Power Science & Research Institute Tianjin 300384 State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiao Tong University Xi'an 710049.

The power grid peaking capacity is insufficient due to the increasing installed capacity of renewable power. Moreover, it is also restricted by the operation mode of combined heat and power units (CHPs), the minimum electricity loads of which are determined by the heat load. It is significant to study the heat-electricity decoupling technologies for CHPs. Therefore, the low-pressure steam turbine renovation technology is studied in this paper with a 300MW unit as reference case. Results show that the minimum electric load rate and the coal consumption are decreased, and the heat-electricity ratio is increased significantly for CHP with low-pressure steam turbine renovation. When the heat load is 1200 GJ/h, the minimum electric load rate and coal consumption with low-pressure steam turbine renovation can be reduced by 32.4 and 30.9 % respectively. The heat-electricity ratio can be increased by 68.8 % after renovation of low-pressure steam turbine.

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Experimental study of n-decane decomposition with microsecond pulsed discharge plasma

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Plasma Science and Technology 2017年第12期19卷 89-95页

作者：宋飞龙金迪贾敏魏雯雯宋慧敏吴云 Science and Technology on Plasma Dynamics Laboratory Air Force Engineering UniversityXi'an 710038People's Republic of China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong UniversityXi'an 710049People's Republic of China Science and Technology on Plasma Dynamics Laboratory Xi'an Jiaotong UniversityXi'an 710049People's Republic of China

A highly-integrated experimental system for the plasma decomposition of fuels was *** were conducted in a flow reactor at atmospheric pressure and confirmed that n-decane could be cracked by large-gap dielectric barrier discharge under the excitation of a microsecond-pulse power supply. Alkanes and olefins with a C atom number that is smaller than10 as well as hydrogen were found in the cracked products of n-decane（n-C10 H22）. The combination of preheating and plasma decomposition had strong selectivity for olefins. Under strong discharge conditions, small molecule olefins were found in the products. Moreover, there was a general tendency that small molecule olefins gradually accounted for higher percentage of products at higher temperature and discharge frequency.

关键词： plasma DBD decomposition n-decane

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A mesh mapping method for MCNP and fluent coupling simulation

A mesh mapping method for MCNP and fluent coupling simulatio...

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2017 Transactions of the American Nuclear Society, ANS 2017

作者： Wang, Xinan Zhang, Dalin Wang, Mingjun 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

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Kinetics of hydrogen abstraction and addition reactions of 3-hexene by H radical

Kinetics of hydrogen abstraction and addition reactions of 3...

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11th Asia-Pacific Conference on Combustion, ASPACC 2017

作者： Yang, Feiyu Sun, Wuchuan Pan, Youshun Deng, Fuquan Jiang, Xue Zhang, Yingjia Huang, Zuohua State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xianning West Road Xi’anShaanxi710049 China

Rate coefficients of H-atom abstraction and addition reactions of 3-hexene by the hydroxyl radical (H) were determined using canonical variational transition-state theory, with potential energy surface evaluated at the CCSD/CBS//BHandHLYP/6311G (d, p) level and quantum mechanical effect corrected by the multi-dimensional small-curvature tunneling method. Results reveal that accounting for approximate 70% of the overall H-atom abstractions occur in the allylic site via both direct and indirect channels. The indirect channel containing two Van der Waals pre-reactive complexes exhibits two times higher rate coefficient relative to the direct one. The H-addition reaction also contains two Van der Waals complexes, and its submerged barrier results in a negative temperature coefficient behavior at low temperatures. In contrast, the H-addition pathway dominates only at the temperatures below 590 K whereas the H-atom abstraction reactions dominate overwhelmingly at the temperature over 590 K. All of the rate coefficients calculated with an uncertainty of a factor of 5 were estimated. Analyses on the potential energy surface and minimum reaction path were also performed in this study. © 2018 Combustion Institute. All Rights Reserved.

关键词： Addition reactions

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Solar Hydrocarbons: Single-Step, Atmospheric-Pressure Synthesis of C2−C4Alkanes and Alkenes from CO2

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Angewandte Chemie 2023年第27期135卷

作者： Rui Song Zhao Li Jiuli Guo Paul N. Duchesne Chenyue Qiu Chengliang Mao Jia Jia Sanli Tang Yang-Fan Xu Wenzhe Zhou Lu Wang Wei Sun Xiaoliang Yan Liejin Guo Dengwei Jing Geoffrey A. Ozin International Research Center for Renewable Energy & State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an Shaanxi 710049 China Solar Fuels Group Department of Chemistry University of Toronto 80 St. George Street Toronto Ontario M5S 3H6 Canada Contribution: Conceptualization (equal) Data curation (lead) Formal analysis (lead) Investigation (lead) Methodology (lead) Writing - original draft (equal) Contribution: Data curation (supporting) Formal analysis (equal) Writing - original draft (supporting) School of Chemistry and Chemical Engineering Anyang Normal University Anyang Henan 455000 P. R. China Contribution: Data curation (supporting) Formal analysis (supporting) Methodology (equal) Software (supporting) Writing - original draft (supporting) Contribution: Data curation (supporting) Software (lead) Department of Materials Science and Engineering University of Toronto Toronto Ontario M5S 3E4 Canada Contribution: Data curation (supporting) Contribution: Conceptualization (supporting) Contribution: Formal analysis (supporting) Contribution: Methodology (supporting) State Key Laboratory of Silicon Materials and School of Materials Science and Engineering Zhejiang University Hangzhou Zhejiang 310058 China Contribution: Project administration (supporting) Contribution: Conceptualization (lead) Formal analysis (lead) Funding acquisition (equal) Project administration (equal) Supervision (equal) Writing - original draft (lead) Contribution: Conceptualization (lead) Funding acquisition (equal) Project administration (equal) Writing - original draft (lead)

Cobalt ferrite (CoFe 2 O 4 ) spinel has been found to produce C 2 −C 4 hydrocarbons in a single-step, ambient-pressure, photocatalytic hydrogenation of CO 2 with a rate of 1.1 mmol g −1 h −1 , selectivity of 29.8 % and conversion yield of 12.9 %. On stream the CoFe 2 O 4 reconstructs to a CoFe−CoFe 2 O 4 alloy-spinel nanocomposite which facilitates the light-assisted transformation of CO 2 to CO and hydrogenation of the CO to C 2 −C 4 hydrocarbons. Promising results obtained from a laboratory demonstrator bode well for the development of a solar hydrocarbon pilot refinery.

关键词： C2−C4 Hydrocarbons CO2 Hydrogenation Cobalt Ferrite Photocatalysis

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Flame front evolution and self-acceleration of hydrogen spherically expending flames 11

Flame front evolution and self-acceleration of hydrogen sphe...

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11th Asia-Pacific Conference on Combustion, ASPACC 2017

作者： Cai, Xiao Wang, Jinhua Zhao, Haoran Huang, Zuohua State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University NO.28 Xianning West Road Xi’an710049 China

An experimental study on flame front evolution and self-acceleration of hydrogen spherically expending flames was conducted on a constant volume combustion chamber over a wide range of Lewis number at elevated pressures. Flame morphology, onset of flame acceleration and flame self-similar acceleration were analyzed. The results shows that the critical radius for onset of flame acceleration increases with the increase in effective Lewis number and the decrease in initial pressure. And the critical Peclet number increases nonlinearly with the increasing Markstein length. Thus, the onset of flame acceleration is controlled by the couple effects of hydrodynamic and diffusional-thermal instabilities. Furthermore, the self-similar acceleration exponent increases with the decrease in the effective Lewis number (or Markstein number) and almost keeps constant with initial pressure. It is concluded that the self-similar acceleration exponent is mainly affected by diffusional-thermal instability. © 2018 Combustion Institute. All Rights Reserved.

关键词： Acceleration

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Optimization design of flue gas temperature for Low-Low Temperature Electrostatic Precipitator

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Journal of Physics: Conference Series 2019年第1期1300卷

作者： Ke Sun Yu Yan Jiahao Jiang Lei Deng State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi'an Jiaotong University Xi'an 710049 China Huadian Electric Power Research Institute Co. LTD. Hangzhou 310030 China

Low temperature corrosion is one of the key issues in application of low-low temperature electrostatic precipitator. The concentration of SO3 affects the acid dew point temperature of flue gas. The exhaust temperature after the air preheater should be higher than the acid dew point temperature. The residual heat of flue gas is fully utilized by the low-temperature economizer. The efficiency of low-low temperature electrostatic precipitator is improved by the comprehensive effect of the condensation of SO3 on the surface of the fine particles, the decrease of the specific resistance of the particles and the agglomeration of the fine particles.

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Performance of V-Cone flowmeter applied to cryogenic fluid measurement considering cavitation

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IOP Conference Series: Earth and Environmental Science 2019年第6期240卷

作者： Denghui He Bofeng Bai Senlin Chen Jie Zhang Pengcheng Guo State Key Laboratory of Eco-hydraulic in Northwest Arid Region Xi'an University of Technology Xi'an 710048 Shaanxi China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 Shaanxi China

The V-Cone flowmeter is a promising differential pressure flowmeter for metering the cryogenic fluid for its many advantages. When the cryogen velocity increases to a certain value, the cavitation may occur in flowmeter, which may significantly affect the performance of V-Cone flowmeter. However, the effect of cavitation on performance of V-Cone flowmeter remains unclear and there are no published studies to our knowledge on this issue. Here we investigate the performance of V-Cone flowmeter when measuring the cryogenic fluids, especially the effects of cavitation on the discharge coefficient and pressure loss coefficient of the flowmeter. Two cryogenic fluids are investigated, including liquid nitrogen (LN2) and liquid hydrogen (LH2). For comparison, the water is also investigated. The realizable κ-ε model is used to describe the turbulence. The Schnerr-Sauer cavitation model is used to investigate the effect of cavitation on the performance of the V-Cone flowmeter. The results show that there was little effect of cavitation on the discharge coefficient and pressure loss coefficient at the initial stage of cavitation. When the cloud cavitation occurred downstream of V-Cone, the discharge coefficient decreases rapidly with Reynolds number increasing, while the pressure loss coefficient rises quickly. The average discharge coefficient is almost the same for different fluids in the stable region; while the cryogenic fluids have wider stable Reynolds number ranges than the water. The lower limits of the Reynolds number for the constant discharge coefficient is very close for three fluids, however, for the upper limits of Reynolds number are quite different. We conclude that measurement range of the cryogenic fluid is much larger than that of the water, which shows that the V-Cone flowmeter exhibits great potential in the measurement of cryogenic fluid. This study provides insights into the effect of cavitation on the measurement of V-Cone flowmeter and opens a new aven

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Numerical Analysis of Flow Instability in the Water Wall of a Supercritical CFB Boiler with Annular Furnace

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Journal of Thermal Science 2016年第4期25卷 372-379页

作者： XIE Beibei YANG Dong XIE Haiyan NIE Xin LIU Wanyu State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University

In order to expand the study on flow instability of supercritical circulating fluidized bed(CFB) boiler,a new numerical computational model considering the heat storage of the tube wall metal was presented in this *** lumped parameter method was proposed for wall temperature calculation and the single channel model was adopted for the analysis of flow *** on the time-domain method,a new numerical computational program suitable for the analysis of flow instability in the water wall of supercritical CFB boiler with annular furnace was *** verify the code,calculation results were respectively compared with data of commercial *** to the comparisons,the new code was proved to be reasonable and accurate for practical engineering application in analysis of flow *** on the new program,the flow instability of supercritical CFB boiler with annular furnace was simulated by time-domain *** 1.2 times heat load disturbance was applied on the loop,results showed that the inlet flow rate,outlet flow rate and wall temperature fluctuated with time eventually remained at constant values,suggesting that the hydrodynamic flow was *** results also showed that in the case of considering the heat storage,the flow in the water wall is easier to return to stable state than without considering heat storage.

关键词： supercritical CFB with annular furnace heat storage flow instability wall temperature numerical analysis

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