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A non-destructive fault diagnosis method for a diaphragm compressor in the hydrogen refueling station

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 2019年第44期44卷 24301-24311页

作者： Li, Xueying Chen, Jiahao Wang, Zhizhong Jia, Xiaohan Peng, Xueyuan Xi An Jiao Tong Univ Sch Energy & Power Engn Xian 710049 Shaanxi Peoples R China Xi An Jiao Tong Univ State Key Lab Multiphase Flow Power Engn Xian 710049 Shaanxi Peoples R China

Costly and time-consuming maintenance of the hydrogen compressors due to their frequent breakdown severely hinders the deployment and promotion of hydrogen refueling station (HRS), and effective condition monitoring and fault diagnosis is the key to reduce the unscheduled downtime of the compressor. This paper proposes a nondestructive method for fault diagnosis of diaphragm compressors for HRSs based on the acoustic emission (AE) signal. The AE signals in the time domain are segmented into angle domain signals correspond to a working cycle. The feature events of the moving components are determined through the measured AE signal in both angle-domain and angle frequency domain based on short-term Fourier transform (STFT). Those feature events signals are innovatively applied to identify the typical abnormal conditions of excessively high oil pressure, slightly inadequate oil pressure and seriously inadequate oil pressure, replacing the traditional and destructive pressure measuring method. The results show that this method can be used to effectively diagnose abnormal working conditions and indicate that this method can be utilized as a powerful tool in the non-destructive condition monitoring and fault diagnosis of the diaphragm compressors. (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

关键词： Hydrogen refueling station Diaphragm compressor Acoustic emission Non-destructive testing Fault diagnosis

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Growth of NiMn layered double hydroxides on nanopyramidal BiVO4 photoanode for enhanced photoelectrochemical performance

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NANOTECHNOLOGY 2020年第11期31卷 115707-115707页

作者： Zhang, Tao Lu, Yumeng Wang, Jian Wang, Zhiqiang Zhang, Wenshuai Wang, Xinyi Su, Jinzhan Guo, Liejin Xi An Jiao Tong Univ Int Res Ctr Renewable Energy State Key Lab Multiphase Flow Power Engn Xian 710049 Shaanxi Peoples R China

Photoelectrochemical water oxidation for hydrogen generation via utilizing sunlight is considered a very promising pathway for generating sustainable energy in an environmental manner. Here, a composite photoanode, consisting of nanopyramidal BiVO4 arrays and one layered double hydroxide (NiMn-LDH) was designed and fabricated via a facile route. The obtained BiVO4/NiMn-LDH composite photoelectrode presented a significant enhancement in the photoelectrochemical (PEC) current density, conversion efficiency and stability for solar water oxidation. With 2D NiMn-LDH decoration, an obvious cathodic shift of similar to 480 mV in the onset potential can be observed, and more than two times enhancement in photocurrent performance is achieved. The improvement in photoelectrochemical activity for BiVO4/NiMn-LDH composite photoanode can be attributed to the enhanced water-oxidation kinetics leading to the efficient separation, transfer and collection of charge carriers at the photoanode/electrolyte interface. The result demonstrates NiMn-LDH represents one of the active oxygen evolution catalysts (OECs) to improve the PEC activity of metal oxide photoanode.

关键词： nanopyramidal BiVO4 NiMn layered double hydroxides photoelectrochemical water oxidation kinetics

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3-Dimensional Multiphysics Modeling of Behaviors of Pressurized Water Reactor Fuel Rods With Missing Pellet Surface

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FRONTIERS IN ENERGY RESEARCH 2021年 9卷

作者： Zhang, Xinhu Wang, Zhao Xi, Yongbo Liu, Wenbo Deng, Yongjun Yun, Di Xi An Jiao Tong Univ Sch Nucl Sci & Technol Xian Peoples R China Nucl Power Inst China Chengdu Peoples R China China Nucl Power Technol Res Inst Co Ltd Shenzhen Peoples R China Xi An Jiao Tong Univ State Key Lab Multiphase Flow Xian Peoples R China

A 3-dimensional (3D) fuel performance analysis program, able to simulate normal operating conditions and accident conditions for PWR fuel behaviors, was developed based on the Multiphysics Object-Oriented Simulation Environment (MOOSE) finite-element framework. By taking fission products swelling, densification and expansion of pellet, thermal and irradiation creep, gap heat transfer, fission gas release, and cladding crack propagation into consideration, detailed fuel behaviors have been simulated in a multiphysics coupling way. Local defects in fuel pellet caused during manufacturing and filling processes known as the missing pellet surface (MPS) can cause abnormal stress distribution of the cladding and it could even lead to cladding failure. Taking Stress Corrosion Cracking (SCC) phenomenon into consideration, a simulation of PWR fuel rodlet that consists of a pellet with an MPS defect and an intact pellet was conducted. The fuel rod has experienced with sorts of events, including normal operating conditions and a high-power ramp event. The simulation results indicated that: 1) The MPS defect affects the temperature and displacement distribution in the vicinity of the MPS defect. When the pellets are in contact with the cladding, the inner surface of the cladding presents a large tensile hoop stress, which accelerates the crack propagation. 2) During the ramp event, the crack propagation rate was higher than that under normal condition and crack length expanded by about 0.1 mu m.

关键词： pellet cladding interaction (PCI) missing pellet surface (MPS) Stress Corrosion Cracking (SCC) thermal-mechanical behavior nuclear fuels

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Two-phase bubbly flow simulation using CFD method: A review of models for interfacial forces

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PROGRESS IN NUCLEAR ENERGY 2020年 125卷 103360-103360页

作者： Khan, Irfan Wang, Mingjun Zhang, Yapei Tian, Wenxi Su, Guanghui Qiu, Suizheng Xi An Jiao Tong Univ Sch Nucl Sci & Technol Shanxi Key Lab Adv Nucl Energy & Technol State Key Lab Multiphase Flow Power Engn Xian 710049 Peoples R China

The computational fluid dynamics (CFD) method has been widely adopted and accepted in the nuclear reactor safety analysis in the recent years. Especially, the application of computational multiphases fluid dynamics (CMFD) is very common in different industrial applications, and definitely in the pressurized water reactor (PWR). In two-phase bubbly flow simulation, the momentum exchange between the phases requires interfacial forces i.e., interfacial drag, lift, turbulent dispersion, wall lubrication, and virtual mass. In the past, numerous models were developed for these interfacial forces with reasonable accuracy. However, agreement on the generally applicable combination of models for these interfacial forces is yet to be achieved. The selection of proper models for these interfacial forces is very important to successfully predict the bubbles concentration distribution and velocity profile. Currently, the practice of interfacial forces model selection from numerous models is mostly ad-hoc based. Therefore, in this article current status of interfacial forces models within the prospect of two-phase bubbly flow CFD simulation are summarized and then parametric dependence, and ranges of applicability of these models are reviewed. Furthermore, some of the limitations of the models for these interfacial forces are determined and future recommendations are made.

关键词： Bubbly flow Interfacial forces models CMFD Two-phase flow PWR

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Investigation on heat transfer of in-tube supercritical water cooling accompanying out-tube pool boiling

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INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 2019年 136卷 938-949页

作者： Lv, Haicai Bi, Qincheng Dong, Xinyu Zhang, Zanjian Zhu, Ge China Ship Dev & Design Ctr Wuhan Hubei Peoples R China Xi An Jiao Tong Univ State Key Lab Multiphase Flow Power Engn Xian 710049 Shaanxi Peoples R China

Heat transfer of in-tube supercritical fluid cooling accompanying out-tube pool boiling was investigated. A smooth horizontal circular tube with an inside-diameter of 20 mm was submerged in a water pool at atmospheric pressure. Test parameters of in-tube were as follows: Pressure: 23-28 MPa, mass flux: 600-1000 kg.m(-2).s(-1), fluid temperature: 400-725 K, and the temperature difference between bulk and wall: 300-374 K. A thermal amplification system based on out-tube pool boiling was used to improve the measurement accuracy of local heat duty near pseudocritical region. According to the experiment, the transition from nucleate boiling to film boiling in the pool occurred near the pseudo-critical fluid region. Sharp variation on thermo-physical properties led to the peak value of heat transfer coefficient in the pseudo-critical region. The pool boiling heat flux increased gradually to 1.19 MWm(-2) near the pseudo critical point. Based on the experimental data, a modified Gnielinski equation was adopted to predict the heat transfer coefficient of in-tube supercritical fluid cooling with out-tube pool boiling. The thermophysical property ratio of the wall to the bulk as well as the effect of buoyancy were taken into consideration in the new correlation. The predicted correlation has an error of less than 20% to the experimental data. (C) 2019 Elsevier Ltd. All rights reserved.

关键词： Supercritical water Heat transfer Cooling with pool boiling Thermal amplification

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Inserting Cr2O3 dramatically promotes RuO2/TiO2 catalyst for low-temperature 1,2-dichloroethane deep destruction: Catalytic performance and synergy mechanism

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APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY 2022年第0期304卷 121002-121002页

作者： Huang, Yu Tian, Mingjiao Jiang, Zeyu Ma, Mudi Chen, Changwei Xu, Han Zhang, Jingjie Albilali, Reem He, Chi Xi An Jiao Tong Univ Sch Energy & Power Engn State Key Lab Multiphase Flow Power Engn Xian 710049 Shaanxi Peoples R China Xian Univ Sci & Technol Coll Geol & Environm Xian 710054 Shaanxi Peoples R China Natl Univ Singapore Dept Mat Sci & Engn Singapore 117575 Singapore Natl Univ Singapore Dept Chem Singapore 117534 Singapore Imam Abdulrahman Bin Faisal Univ Dept Chem Coll Sci POB 1982 Dammam 31441 Saudi Arabia

Ru-based catalysts with increased attention for CVOC purification still have huge challenges in promoting their low-temperature activity and durability. Here, a Cr-modified RuO2/TiO2 catalyst was fabricated and employed for 1,2-dichloroethane (1,2-DCE) destruction. The synergy of Cr2O3 and RuO2/TiO2 enhances the exposure of surface Ru, generating abundant reducible Cr6+ and Ru4+ species and chemically adsorbed oxygen, which promote the activity and CO2/HCl selectivity in 1,2-DCE decomposition evidently. 1,2-DCE primarily activates on the Lewis acid sites (LAS) over RuO2/Cr2O3 /TiO2 with C-Cl cleavage. Meanwhile, C-C cleavage occurs along with the dehydrochlorination and chlorination reactions. The presence of Cr2O3 greatly improves the LAS concentration and redox ability of RuO2/TiO2, accelerating the deep destruction of 1,2-DCE and inhibiting the formation of CH2Cl2, C2HCl3 and CHCl3. Cr species with superior chlorine resistance elevate the durability of RuO2/Cr2O3 /TiO2 under simulated conditions toward H2O, SO2, and chlorine species, making it a promising candidate for industrial CVOC catalytic degradation.

关键词： 2-dichloroethane Catalytic selectivity Stability Reaction mechanism

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Experimental study on the working states of membrane walls in the arch-fired boiler with different fuel proportion coefficients

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APPLIED THERMAL engineering 2019年 148卷 404-411页

作者： Wen, D. Yao, Y. S. Li, L. Jeon, Min-Gyu Zhou, Q. L. Li, N. Deguchi, Y. Xi An Jiao Tong Univ State Key Lab Multiphase Flow Power Engn Xian 710049 Shaanxi Peoples R China Tokushima Univ Grad Sch Adv Technol & Sci Tokushima 7708501 Japan

To ensure boiler safety operating, it is necessary to obtain a systematic knowledge about the working states of membrane walls and find the most salient impact factors of membrane walls' deformation. In this study, a scaled down arch-fired boiler is used to investigate temperature, heat flux, strain and stress on its membrane walls. The results showed that an extremely high strain and stress appeared at high-temperature zone. It was mostly presented on the front wall in the lower furnace, which is near the angle connecting the lower furnace and the ash hopper. The flow-field deflection is the forming reason for it. Both the angle and external constraints such as water pipes had a significant influence upon it as well. They restricted the direction of stress. However, the heat flux had less impact on the deformation. Compared with the symmetrical fuel supplying (c = 1) condition, changing the fuel proportion coefficient (denoted by c) would increase the strain and stress on the front wall. But, combined the temperature change, the optimal range of c was found to be 0.8-1. The results obtained in this experiment are meant to be valuable in designing and optimizing the arch-fired boilers' configuration and operation.

关键词： Arch-fired boiler Membrane walls' deformation Temperature Heat flux Strain and stress Fuel proportion coefficient

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Partial sulfuration-induced defect and interface tailoring on bismuth oxide for promoting electrocatalytic CO2 reduction

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JOURNAL OF MATERIALS CHEMISTRY A 2020年第5期8卷 2472-2480页

作者： Yang, Xuxiao Deng, Peilin Liu, Dongyu Zhao, Shuang Li, Dan Wu, Hu Ma, Yaming Xia, Bao Yu Li, Mingtao Xiao, Chunhui Ding, Shujiang Xi An Jiao Tong Univ Sch Sci Dept Appl Chem Xian Key Lab Sustainable Energy Mat Chem Xianning West Rd Xian 710049 Peoples R China Xi An Jiao Tong Univ Int Res Ctr Renewable Energy State Key Lab Multiphase Flow Power Engn Xianning West Rd Xian 710049 Peoples R China HUST Key Lab Mat Chem Energy Convers & Storage Hubei Key Lab Mat Chem & Serv Failure Sch Chem & Chem EngnWuhan Natl Lab OptoelectMin 1037 Luoyu Rd Wuhan 430074 Peoples R China

Defect and interface engineering is a powerful strategy to tune the electronic structure and adsorption behavior of electrocatalysts, boosting the performance of the electrocatalytic CO2 reduction reaction (eCO(2)RR). Herein, we construct a hybrid electrocatalyst, Bi2S3-Bi2O3@rGO, with a large amount of defects (oxygen vacancies etc.) and a specific interface between bismuth sulfide (Bi2S3) and bismuth oxide (Bi2O3) by a partial precipitation conversion method. Both experimental results and theoretical calculations reveal that the Bi2S3-Bi2O3 interface drastically lowers the formation energy of HCOO*, in favor of the production of formate (HCOOH) over CO, promoting the conversion of CO2 to HCOOH. The as-prepared electrocatalyst shows excellent electrocatalytic activity to generate HCOOH with a high faradaic efficiency of over 90% and a low overpotential of 700 mV, as well as excellent durability for more than 24 h.

关键词： Bismuth compounds

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power-Grid Dispatching Method Considering Heat-power Coupling Characteristics of CHP Units 5

Power-Grid Dispatching Method Considering Heat-Power Couplin...

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5th International Conference on Environmental Science and Material Application (ESMA)

作者： Guan, Sensen Wang, Kun E, Zhijun Hu, Qingbo Wang, Shan Fang, Jiuwen Chen, Rong Lu, Fei Yang, Bangyu Liu, Ming Tianjin Elect Power Sci & Res Inst Tianjin 300384 Peoples R China State Grid Tianjin Elect Power Co Tianjin 300010 Peoples R China Xi An Jiao Tong Univ State Key Lab Multiphase Flow Power Engn Xian 710049 Peoples R China Tianjin Guodian Jinneng Binhai Cogenerat Co LTD Tianjin 300459 Peoples R China

The dispatching optimization of power grid is to obtain the greatest benefits on the basis of safe and stable operation of the power grid, which is of great significance for the energy-saving, reliability of the power grid. Therefore, a multi-objective model of power grid dispatching which considers the heat-power coupling characteristics of CHP units is developed in this study. The economic benefit and minimum wind power abandonment are taken as optimizing targets in the model. Meanwhile, the detail operation characteristics of condensing power plants and CHP units are considered in this model based on off-design models of power plant. Besides, the regional heat load and power load are scheduled together. Finally, the AHP-entropy method is used to obtain the weights of the two optimizing targets of economic benefit and wind power abandonment, and the multi-objective is converted into a single-objective.

关键词： Wind power

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Numerical simulation of a small high-temperature heat pipe cooled reactor with CFD methodology

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NUCLEAR engineering AND DESIGN 2020年 370卷 110907-110907页

作者： Sun, Hao Tang, Simiao Wang, Chenglong Zhang, Jing Zhang, Dalin Tian, Wenxi Qiu, Suizheng Su, Guanghui Xi An Jiao Tong Univ Sch Nucl Sci & Technol Shaanxi Key Lab Adv Nucl Energy & Technol State Key Lab Multiphase Flow Power Engn Xian 710049 Peoples R China

Heat pipe cooled reactor is a new type nuclear reactor system designed for unconventional application fields, especially in deep space exploration, planetary surface power plants, and in decentralized electricity market. Heat pipe with alkali metal working fluid and porous wick is considered to be an ideal cooling method of small and special purpose nuclear reactors. In this work, a CFD model is established to simulate the heat transfer characters of a high temperature heat pipe, consisting of three parts: heat pipe wall, wick and vapor space. Commercial software including user defined functions (UDFs) is adopted to obtain the temperature and flow field inside the heat pipe. Validation of methodology is carried out with experimental data, proving that the calculation model is capable simulating the thermal-hydraulics characteristics of potassium heat pipes. On this basis, the heat pipe CFD model and methodology are applied to an originally designed 20kWt small heat pipe cooled reactor, consisting of a reactor core, heat pipes, a static conversion system, and heat removal system. The 1/6 reactor is 3-dimensionally simulated to analyze the thermal behaviors under steady-operation state and heat pipe failure accident conditions, which bring safety threat to reactor core. Under steady operating condition, the heat pipes show well isothermality and the temperature distribution satisfies the limit of materials, verifying the rationality of the design scheme. When part of the heat pipes fail, it causes a local high temperature area in the active zone, requiring the heat removal system to feature enough safety margin to take the fission heat away from reactor. This work provides reference in heat pipe cooled reactor design, as well as a CFD method in simulation of heat pipe with alkali metal working fluid.

关键词： Heat pipe reactor Validated CFD method Thermal behaviors Heat pipe failure

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