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Artificial Intelligence and Electromechanical Automation (AIEA), International Conference on

作者： Ke Sun Jia'an Wang 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 China China Huadian Electric Power Research Institute Co. Ltd. Hangzhou China

ISBN: (数字)9781728182889

ISBN: (纸本)9781728182896

In this paper, the specimen of the bursting tubes, original tube and oxide-like debris are analysed in-depth by macroscopic examination, chemical composition analysis, mechanical properties, metallographic examination, scanning electron microscopy and energy spectrum analysis etc.,. It shows that the main reason for the tube-burst is that the original oxide matters or time-original oxide matters blocks the tube, reducing the cooling effect of the steam, and resulting in a short-term overheating of the tube. It is recommended to control the internal cleanliness of boiler equipment and pipest.

关键词： component tube burst failure analysis oxide matters over temperature FAILURE ANALYSIS excess temperature platen superheater Energy Dispersive X-Ray Spectroscopy oxides Cooling effects tube reducing

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Hierarchical zeolite enveloping Pd-CeO2 nanowires: An efficient adsorption/catalysis bifunctional catalyst for low temperature propane total degradation

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CHEMICAL engineering JOURNAL 2020年 393卷 124717-124717页

作者： Dong, Tao Liu, Wenming Ma, Mudi Peng, Honggen Yang, Senyou Tao, Jinxiong He, Chi Wang, Liang Wu, Peng An, Taicheng Nanchang Univ Coll Chem Key Lab Jiangxi Prov Environm & Energy Catalysis 999 Xuefu Rd Nanchang 330031 Jiangxi Peoples R China Xi An Jiao Tong Univ Sch Energy & Power Engn State Key Lab Multiphase Flow Power Engn Xian 710049 Shaanxi Peoples R China Guangdong Univ Technol Inst Environm Hlth & Pollut Control Sch Environm Sci & Engn Guangdong Key Lab Environm Catalysis & Hlth Risk Guangzhou 510006 Peoples R China Univ Chinese Acad Sci Natl Engn Lab VOCs Pollut Control Mat & Technol Beijing 101408 Peoples R China Zhejiang Univ Coll Chem & Biol Engn Minist Educ Key Lab Biomass Chem Engn Hangzhou 310027 Peoples R China East China Normal Univ Dept Chem & Mol Engn Shanghai Key Lab Green Chem & Chem Proc North Zhongshan Rd 3663 Shanghai 200062 Peoples R China

Volatile organic compounds (VOCs) are significant ozone (O-3) and particulate matter (PM) formation precursors and are deleterious to both human health and environment. Catalytic combustion can degrade VOCs to H2O and CO2 without secondary pollution, suggesting a potential sustainable technology for air pollution control. However, the concentration of exhausted VOCs is usually too low for effective decomposition. Herein, a novel adsorption/catalysis bifunctional catalyst, hierarchical silicalite-1 (S-1) zeolite enveloping Pd-CeO2 nanowires (Pd-CeO2NW@S-1), was designed and prepared using a simple one-pot two-step method and applied for the degradation of propane. Pd-CeO2NW@S-1 exhibited superior catalytic activity (T-90 decreased to 296 degrees C) as well as increased thermal and hydrothermal stability (no obviously decrease in activity when treated at 700 degrees C or reacted with water gas, respectively) compared with Pd-CeO2 nanowires supported on the outer surface of S-1 (Pd-CeO2NW/S-1) and previously reported Pd based catalysts for propane degradation. In addition, the activity over Pd-CeO2NW@S-1 after five reaction cycles just with little decrease and could be restored by a simple regeneration step and without any detection of coke. The remarkable performance over Pd-CeO2NW@S-1 was attributed to the high dispersion of Pd and Ce encapsulated in hierarchical zeolite with superior propane adsorption performance and the special confinement structure according the Mars-van-Krevelen (MvK) mechanism. This confinement adsorption/catalysis bifunctional strategy can be used to design other high-performance catalysts for degradation of VOCs.

关键词： Volatile organic compounds Catalytic combustion Propane total degradation Zeolite confinement Sinter resistance Adsorption/catalysis bifunctional catalyst

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Analysis of Frequent Tube Burst of High Temperature Reheater in 600 MW Unit

Analysis of Frequent Tube Burst of High Temperature Reheater...

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Sustainable power and Energy Conference (iSPEC)

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

ISBN: (数字)9781728191645

ISBN: (纸本)9781728191652

The reasons of frequent tube burst of the high temperature reheater in a supercritical 600 MW unit were systematically investigated via the examination of macroscopic inspection, chemical composition, mechanical properties, microstructures, scanning electron microscope and energy disperse spectroscopy detection. It is demonstrated that the tube burst of the high temperature reheater results from not only design factors, but also manufacture quality. Due to the absence of solid solution treatment in spare elbow, the inner dislocations and residual stress increase obviously, which accelerates the precipitation of carbide containing Cr and the formation of Cr depleted zone on grain boundary(GB) subsequently, leading to the decrease of GB corrosion resistance and the final leakage of high temperature reheater tube induced by intergranular corrosion.

关键词： Temperature Corrosion Welding Electron tubes Residual stresses Acceleration Elbow

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High spatio-temporal heterogeneity of carbon footprints in the Zhejiang Province, China, from 2005 to 2015: implications for climate change policies

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ENVIRONMENTAL CHEMISTRY LETTERS 2020年第3期18卷 931-939页

作者： Zheng, Sheng Shan, Jiaming Singh, Ramesh P. Wu, Yuzhe Pan, Jiachen Wang, Yueshe Lichtfouse, Eric Zhejiang Univ Dept Land Management Hangzhou 310058 Peoples R China Chapman Univ Schmid Coll Sci & Technol Sch Life & Environm Sci One Univ Dr Orange CA 92866 USA Xi An Jiao Tong Univ State Key Lab Multiphase Flow Power Engn Xian 710049 Peoples R China Aix Marseille Univ CNRS Coll France IRDINRAECEREGE F-13100 Aix En Provence France

Energy consumption is a major factor influencing climate change. Low-carbon strategies can be defined from carbon (C) footprint and ecological pressure caused by energy consumption. We hypothesized that this should be done at the regional and city levels because factors controlling C footprints vary with location and time, yet there is actually little knowledge at local levels. Here, we mapped the C emissions and footprint of 11 cities in the Zhejiang Province of China, a rapidly growing area of about 57 million inhabitants, which is representative of the strong economic growth in China. The C footprint is expressed as the land surface necessary to adsorb C emissions. We studied spatio-temporal evolution of C footprints from 2005 to 2015 using the center of gravity method. Results show that total annual C emissions due to energy consumption in Zhejiang increased by 40.83 million tons (55.8%) from 2005 to 2011. Then, from 2011 to 2015, C emissions decreased by 5.8%, which is explained by the 5-year national plan aiming at decreasing emissions. Similarly, the total C footprint increased by 55.8% from 29,201,904 hm(2) in 2005 to 45,496,817 hm(2) in 2011 and then declined by 5.8% from 2011 to 2015. At the city level, Ningbo has the largest C footprint contribution, whereas Lishui the lowest. Zhoushan shows an increase in C emissions and footprint, whereas Hangzhou and Shaoxing show a decline. The center of gravity of the C footprint is located in Shaoxing and is moving southeast from 2006 to 2011. Overall, our findings reveal the high spatial heterogeneity of C footprint at the regional and city levels, implying that national low-carbon strategies should be adapted at lower levels for higher efficiency.

关键词： Spatio-temporal heterogeneity Energy consumption Carbon footprint Zhejiang Province

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Electrostatic-field-triggered stress in the lithiation of carbon-coated silicon

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JOURNAL OF power SOURCES 2020年 459卷 228100-228100页

作者： Zheng, Yao-Ting He, Min Cheng, Guang-xu Zhang, Zaoxiao Xuan, Fu-Zhen Wang, Zhengdong Xi An Jiao Tong Univ Sch Chem Engn & Technol State Key Lab Multiphase Flow Power Engn Xian Peoples R China East China Univ Sci & Technol Key Lab Pressure Syst & Safety Minist Educ Shanghai Peoples R China

The traditional viewpoint "the more the lithiation reaction, the bigger the growth stress" is proved to be improper through the simulation of lithiation reaction of carbon-coated silicon particle in the presence of electrostatic field. In the simulation, a positive correlation between growth stresses and charge density is observed and coincides with the experiment results in Pharr's work. Simulation results also indicate that the growth stresses consist of lithiation-reaction-induced stress (LRIS) and field-triggered stress (FTS). FTS is always neglected but can be comparable to, or even bigger than the LRIS in the initial stage of lithiation reaction. The physical mechanism for the formation of FTS is uncovered based on the standpoint of energy conservation and transformation. The FTS needs to be considered seriously because it can bring much more serious damage to the lattice structure of silicon especially in the development of lithium ion battery featuring rapid charging.

关键词： Ultrafast charging Electrostatic field Growth stress Lithiation

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Modeling of the filtered drag force in gas-solid flows via a deep learning approach

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CHEMICAL engineering SCIENCE 2020年 225卷 115835-115835页

作者： Zhang, Yu Jiang, Ming Chen, Xiao Yu, Yaxiong Zhou, Qiang Xi An Jiao Tong Univ Sch Chem Engn & Technol Xian 710049 Peoples R China Xi An Jiao Tong Univ State Key Lab Multiphase Flow Power Engn Xian 710049 Peoples R China

A deep learning approach based on a proposed artificial neural network (ANN) is exploited to predict the filtered drag force, which is a desirable term for coarse-grid simulations of gas-solid flows. The proposed ANN model includes one input layer, five hidden layers and one output layer. The hidden layers are composed of three convolutional layers and two fully-connected layers. The results show that the proposed ANN model is superior to the multi-layered perceptron (MLP) model and the best available traditional functional model over a wide range of the filter size. The results also indicate that the use of the information on neighboring coarse grids is necessary for accurate estimation of the filtered drag force at the considered filter sizes. This finding is substantiated by a budget analysis which demonstrates that the diffusion of the Reynolds stress and solid phase stress significantly affects the filtered drag force. (c) 2020 Elsevier Ltd. All rights reserved.

关键词： Gas-solid flow Meso-scale structure Artificial neural network Two-fluid model Drag force

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Heat Transfer Studies of Arrays of Prolate Particles in Gas-Solid flows

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MATHEMATICAL PROBLEMS IN engineering 2020年第1期2020卷

作者： Basit, Romana Li, Xinyang Huang, Zheqing Zhou, Qiang Xi An Jiao Tong Univ Sch Chem Engn & Technol Xian 710049 Peoples R China Xi An Jiao Tong Univ State Key Lab Multiphase Flow Power Engn Xian 710049 Peoples R China

Numerical study of forced convection heat transfer from arrays of prolate particles is performed using the second-order Immersed Boundary-Lattice Boltzmann Method (IB-LBM). Prolate particle is studied with aspect ratio of 2.5 with solid volume fraction variation from 0.1 to 0.3. For each solid volume fraction, arrays of prolate particles are generated and simulations have been performed to calculate Nusselt number for four different Hermans orientation factors and various Reynolds numbers. From the simulation results, it has been observed that, for any specific value of Hermans orientation factor, Nusselt number increases with the increase of the Reynolds number and solid volume fraction. More importantly, it is found that the effect of orientations on Nusselt number is significant. Nusselt number correlation is developed for ellipsoidal particles as function of Reynolds number, Prandtl number, solid volume fraction, and orientation factors. This correlation is valid for 0.1 <= c <= 0.3 and 0

关键词： Nusselt number

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Effect of equivalence ratio on combustion and emissions of a dual-fuel natural gas engine ignited with diesel

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APPLIED THERMAL engineering 2019年 146卷 738-751页

作者： Zheng, Jinbao Wang, Jinhua Zhao, Zhibo Wang, Duidui Huang, Zuohua Xi An Jiao Tong Univ State Key Lab Multiphase Flow Power Engn Xian 710049 Shaanxi Peoples R China Wuxi Fuel Inject Equipment Res Inst 15 Qianrong Rd Wuxi 214063 Peoples R China

China is the world largest natural gas engine market, and the natural gas price has a large fluctuation range, Natural gas-diesel dual-fuel engine may be one of the options to cope with gas price fluctuations. Effect of equivalence ratio on combustion and emissions with a low compression ratio of 14.2 in a dual-fuel 6 cylinder engine was experimentally studied. Comparison between dual-fuel and spark ignition engine at stoichiometric combustion and same IMEP was conducted. Results show that the gas consumption rate decreases with the increase of equivalence ratio regardless of the strategy in nozzle parameter, exhaust gas recirculation (EGR) rate, injection parameter. Peak heat release rate and exhaust gas temperature increased, and decrease of combustion duration is obtained due to the high equivalence ratio in dual-fuel ignition mode. The gas consumption rate trend of spark ignition mode is similar to that of dual-fuel engine with the increase of equivalence ratio. Dual fuel engine with low compression ratio of 14.2 run as spark ignition (SI) gas engine at stoichiometric ratio, but the difference lies in the combustion process. The peak heat release rate of dual-fuel engine presents higher value, while the combsution duration of dual-fuel engine is shorter, and the gas consumption rate of dual fuel engine is lower than that of SI engine.

关键词： Dual-fuel engine Natural gas Diesel Combustion Emissions

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Investigation of curvature statistics of turbulent premixed Bunsen flames based on leading points concept 12

Investigation of curvature statistics of turbulent premixed ...

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12th Asia-Pacific Conference on Combustion, ASPACC 2019

作者： Zhang, Weijie Wang, Jinhua Xia, Hao Lin, Wenjun Zhang, Meng Huang, Zuohua State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University No. 28 Xian Ning Road Beilin District Xi'an Shaanxi710049 China

In previous studies, it was showed that the leading point, namely, the positively curved flame front, may be vital in controlling the propagation of flame, thus controlling the burning intensity of turbulent premixed flames. This paper is aimed at investigating the morphologies of the leading points under low and relatively high turbulence intensities based on flame curvature statistics. Premixed C3H8/H2/air flames were obtained with a Bunsen burner. Flame front was captured with OH-PLIF technique. The results show prevalent leading points with positive curvatures at low turbulence intensity. Percentage of positive curvatures were observed to increase at lower turbulence intensity. However, with increasing turbulence intensity, such feature can be mitigated or even overpowered with equal probability of negative and positive curvatures. Proper models for leading point are recommended according to the experimental results. However, question remains as to the underlying mechanism of leading point concept. © Asia-Pacific Conference on Combustion, ASPACC *** right reserved.

关键词： Combustion

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A new surrogate fuel for emulating the physical and chemical properties of RP-3 kerosene

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FUEL 2020年 259卷 116210-000页

作者： Liu, Jing Hu, Erjiang Zeng, Wen Zheng, Weilin Xi An Jiao Tong Univ State Key Lab Multiphase Flow Power Engn Xian 710049 Shaanxi Peoples R China Shenyang Aerosp Univ Liaoning Key Lab Adv Test Technol Aerosp Prop Sys Shenyang 110136 Liaoning Peoples R China

A new surrogate fuel was developed to emulate both the physical and chemical properties of RP-3 kerosene. Six property targets were chosen for the new surrogate fuel formulation, which are hydrogen/carbon ratio, average molecular weight, cetane number, low calorific value, density and viscosity. The surrogate fuel was developed with only those species readily available in existing kinetic mechanisms, that are n-decane, n-dodecane, isocetane, methylcyclohexane and toluene. The mole fractions of the above components are 14%, 10%, 30%, 36%, 10%, respectively, which determined by an optimizer based on the error of the property targets between the surrogate fuel and RP-3 kerosene. Comparisons with RP-3 kerosene show that the newly developed surrogate fuel reproduces the six property targets of RP-3 kerosene. Further experimental investigations were performed in a chemical shock tube and constant volume bomb to obtain the ignition delay and laminar combustion characteristics of the new surrogate fuel and RP-3 kerosene. The results show that the ignition delay times and laminar combustion velocities of the surrogate fuel are in good agreement with that of RP-3 kerosene.

关键词： Surrogate fuel RP-3 kerosene Laminar combustion velocity Ignition delay time Markstein length

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