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Study on Dynamic Characteristics of a 600MW Ultra-Supercritical Double-Reheat Boiler

Energy Procedia 2019年 158卷 5257-5262页

作者： Zhu Wang Ming Liu Chaoyang Wang Daotong Chong Yunjie Yan State Key Laboratory of Multiphase Flow in Power Engineering School of Energy & Power Engineering Xi’an Jiaotong University Xi’an Shaanxi

Based on the GSE software, the simulation model of an ultra-supercritical double-reheat tower boiler was established, and its reliability was checked with design data. Then, the dynamic characteristics of the ultra-supercritical double-reheat boiler were studied. Simulation results reveal the response times of different input parameters greatly vary. When stepping disturbances to the feed-coal rate, feed-water rate, and feed-water temperature, the response time under feed-water’s temperature disturbance is the longest, which is about 1, 800 s. When the same input parameter disturbs, the output parameters have the same response tendency with different amplitudes. Moreover, the fiercer the disturbance is, the more greatly the parameter changes.

关键词： double-reheat dynamic characteristics GSE

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A multi-criteria comprehensive evaluation method for distributed energy system

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Energy Procedia 2019年 158卷 3748-3753页

作者： Haibo Dai Jinshi Wang Gen Li Weixiong Chen Binbin Qiu Junjie Yan State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an 710049 China

As the evaluation of distributed energy system (DES) is a complex problem, multi-criteria is necessary to fully evaluate the performance for different systems. In this paper, a novel multi-criteria evaluation method was established to assess the comprehensive performance of DES from economic, energy and environment criterions. Before constructing a multi-level indexes system, index correlation analysis was carried out to ensure the independence of indexes. Considering the advantages and disadvantages of subjective and objective methods, AHP-entropy method was proposed by integrating analytic hierarchy process (AHP) and information entropy method together to assign weights to the indexes. Finally, the technique for order preference by similarity to ideal solution (TOPSIS) method was applied to determine the optimal DES scheme. The case study indicated that the evaluation results of this method were in accordance with the reality, which could provide a reference for the selection of DES solutions.

关键词： DES comprehensive evaluation AHP-entropy method TOPSIS method

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Fatigue Lifetime Estimation of a Heater in Coal-Fired power Plants Under a Flexible Operational Framework-Regulating Extraction Steam of High-Pressure Heaters

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Energy Procedia 2019年 158卷 5225-5230页

作者： Yongliang Zhao Peipei Fan Ming Liu Daotong Chong Junjie Yan State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an 710049 China

Although rapid load variation of coal-fired power plants has become a prior objective for improving the operational flexibility, it will cause a lifetime reduction of heaters due to alternating stresses during transient processes. In the paper, among four flexible regulating measures, the dynamic characteristics of thermal parameters were obtained by GSE software, and thermo-mechanical stresses of 1# high-pressure (HP) heater were calculated by Finite Element Analysis, then the fatigue lifetimes of 1# HP heater were estimated and compared. It turns out that the most stressed position is at water chamber baffle, the allowable numbers of cycles at four measures are 5913-9419, and fatigue damage ratios for per cycle are 0.0106-0.0169%. The study can provide a detailed reference for operators to ensure the operational security of coal-fired power plants within flexibility frameworks.

关键词： Fatigue lifetime estimation thermo-mechanical stress dynamic simulation coal-fired power plant

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Corrigendum to “Enhanced oxygen reduction reaction activity of La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ cathode via Pr-doping for intermediate-temperature solid oxide fuel cells” [J. Alloys Compd. 1022 (2025), 179947]

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Journal of Alloys and Compounds 2025年 1024卷

作者： Benlin Xiang Weihua Jia Yuqi Wang Fei Li Weibin Xu Xinyi Li Jianbing Huang Quanyi Tang Xin Ding Le Wu Lan Zheng School of Chemical Engineering Northwest University Xi’an Shaanxi 710127 China Xi'an Key Lab of Green Hydrogen Energy Production Storage & Application Integration Technology Xi’an Shaanxi 710127 China Shaanxi Key Laboratory for Carbon Neutral Technology Xi’an Shaanxi 710069 China School of Carbon Neutrality College Northwest University Xi’an Shaanxi 710127 China State Key Laboratory of Multiphase Flow in Power engineering Xi’an Jiaotong University Xi'an Shaanxi 710049 China

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Numerical investigation on erosion characteristics of coplanar elbows connection for gas-solid flow

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Energy Procedia 2019年 158卷 5245-5250页

作者： Yu Wang Rongtang Liu Ming Liu Junjie Yan State Key Laboratory of Multiphase Flow in Power Engineering School of Energy & Power Engineering Xi’an Jiaotong University Xi’an Shaanxi

Elbows are used widely in power plants. The erosive problems of the pipelines influence the performance of pipe system. Continuous arrangement of elbows is often necessary due to the limit of external space and connection length between elbows is short under the circumstance. The interaction between two elbows has influence on the flow field and erosion characteristics of elbows connection. The erosion distribution in coplanar elbow connection was presented and erosion characteristics of two kinds of coplanar elbows connection were obtained. The effects of inlet velocity and mass loading rate on maximum erosion rate were investigated. Results suggested the maximum wear rate increased exponentially with inlet velocity and increased linearly with mass loading rate.

关键词： Elbows connection Erosion characteristics Numerical simulation Gas-solid flow

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Irreversibility Analysis of a Recuperative Heater during Undergoing the flowrate Impulsive Disturbance Transient Processes

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Energy Procedia 2019年 158卷 5311-5316页

作者： Chaoyang Wang Yongliang Zhao Zhu Wang Ming Liu Junjie Yan State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an 710049 China

The recuperative heater is widely used in the industrial production processes, and the irreversibility analysis on the heater during transients is scarce but necessary. Numerical method was adopted to model the recuperative heat exchanger to exhibit its dynamic behaviors during transient processes. The difference between the transient and stationary irreversibility can be called additional irreversibility. In this paper, the dynamic behaviors of the recuperative heater during transients are presented. With these thermal parameters, the irreversibility of a recuperative heater during hot and cold fluid flow rates impulsive disturbance transient processes was calculated and analyzed in detail. The calculation results show that: compared with steady-state corresponding value, the real-time irreversibility rate of the heater during transients is different. The total additional irreversibility values with impulsive disturbance in hot and cold fluid flow rates are obtained separately.

关键词： Recuperative heaters Irreversibility analysis Dynamic modeling Transisent processes

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Constructing built-in electric fields in bimetallic selenide heterojunctions to bidirectional catalyze polysulfide conversion for flexible lithium-sulfur batteries

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Chemical engineering Journal 2025年 516卷

作者： Fangchao Han Shichao Zhang Dezhi Yan Yalan Xing Jun Xia Xianggang Guan Qiang Lu Puheng Yang Xiaomeng Wu Qianfan Zhang School of Materials Science and Engineering Beihang University Beijing 100191 PR China Chinese Acad Sci Inst Proc Engn State Key Lab Multiphase Complex Syst POB 353 Beijing 100190 PR China Shanghai Institute of Space Power Sources/State Key Laboratory of Space Power Sources PR China

Parasitic shuttle effects and sluggish kinetics severely limit the practical applications of lithium-sulfur (Li–S) batteries. Developing conducting catalysts with high catalytic activity is effective strategy to address such issues. Electronic engineering as tuning strategy can optimize the electronic structure and enhance the redox reaction kinetics. Herein, NiSe 2 -CoSe 2 hollow microspheres with abundant heterogeneous interfaces were synthesized as sulfur cathode catalysts. DFT calculations show that heterostructure can promote electron redistribution and form built-in electric field (BIEF), which causes the directional transfer of electrons. Additionally, NiSe 2 -CoSe 2 has optimized adsorption energy, which can effectively suppress shuttle effect. Meanwhile, electrochemical tests further confirmed bidirectional catalytic ability. Benefiting the merits, S/NiSe 2 -CoSe 2 -GO-CNF (S/NiCo-GN) achieved an initial discharge specific capacity of 1353.35 mAh g −1 at 0.2C and stable 1000 cycles at 1C with a capacity decay rate of only 0.044 % per cycle. Moreover, S/NiCo-GN also achieved high areal capacity of 1.688 mAh cm −2 at 0.5C under high loading (∼2.5 mg cm −2 ) and lean electrolyte (∼10 μL mg −1 ) conditions. The flexible pouch cell further demonstrated its high safety, good thermal stability, and robust mechanical stability. This work provides guiding methods for the design of efficient catalysts, which can contribute to the realisation of high-performance Li–S batteries.

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Laminar burning velocity of gasoline and gasoline surrogates under various pressures and temperatures 12

Laminar burning velocity of gasoline and gasoline surrogates...

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12th Asia-Pacific Conference on Combustion, ASPACC 2019

作者： Hu, Erjiang Xu, Zhaohua Gao, Zhenhua Huang, Zuohua Stake Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University No.28 Xianning West Road Shaan Xi710049 China

The outwardly propagating spherical flame method was used to measure the laminar burning velocity of a commercial gasoline fuel having RON of 92 and gasoline surrogate. Measurements were conducted at the equivalence ratio of 0.8 to 1.5, initial temperatures of 358 K, 403 K, and 448 K and initial pressures of 1 atm, 2 atm and 5atm in a constant volume bomb. The surrogate of primary reference fuel (PRF-92, 92% iso-octane + 8% n-heptane) and toluene reference fuel (TRF-92, 16.69% iso-octane + 22.65% n-heptane + 60.66% toluene) were proposed to match the laminar burning velocity of gasoline (CNPC 92#). It could be found that the TRF-92 was able to successfully reproduce the laminar burning velocity of the gasoline under various experimental conditions. © Asia-Pacific Conference on Combustion, ASPACC *** right reserved.

关键词： Gasoline

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The preliminary safety analysis of a S-CO2 Brayton cycle cooled reactor system 18

The preliminary safety analysis of a S-CO2 Brayton cycle coo...

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18th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2019

作者： Gao, Chuntian Wu, Pan Shan, Jianqiang State Key Laboratory of Multi phase Flow in Power Engineering Xi'an Jiaotong University Xi'an China

Safety analysis is an important issue in the feasibility evaluation of a new reactor concept. The preliminary safety analysis of a reactor system, which applies simple Super-critical Carbon Dioxide (S-CO2) Brayton cycle as its direct power conversion system, is carried out via an in-house safety analysis code SCTRAN/CO2 in this paper. Typical accidents for gas cooled reactor and Brayton cycle system are analyzed, like loss of flow accident (LOFA), reactivity insertion accident (RIA). Passive reactor decay heat removal system is evaluated under these accidents. This work will be benefit for the safety evaluation and safety system design for the newly proposedS-CO2 cooled reactor concept. © 2019 American Nuclear Society. All rights reserved.

关键词： Carbon dioxide

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Single-atom cobalt-incorporating carbon nitride for photocatalytic solar hydrogen conversion: An X-ray spectromicroscopy study

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Journal of Electron Spectroscopy and Related Phenomena 2023年 264卷

作者： Huang, Yu-Cheng Chen, Jie Lu, Ying-Rui Arul, K. Thanigai Ohigashi, Takuji Chen, Jeng-Lung Chen, Chi-Liang Shen, Shaohua Chou, Wu-Ching Pong, Way-Faung Dong, Chung-Li National Synchrotron Radiation Research Center Hsinchu30010 Taiwan School of Chemical Engineering and Technology Xi'an Jiaotong University Xi'an710049 China Research Center for X-ray Science & Department of Physics Tamkang University New Taipei City25137 Taiwan Photon Factory Institute of Materials Structure Science High Energy Accelerator Research Organization Tsukabu Japan UVSOR Synchrotron Facility Institute for Molecular Science Okazaki Japan International Research Center for Renewable Energy State Key laboratory of Multiphase Flow in Power Engineering Xi`an Jiaotong University Shaanxi Xi`an710049 China Department of Electrophysics National Yang Ming Chiao Tung University Hsinchu30010 Taiwan

The use of carbon nitride-based materials and light to drive catalytic water splitting has enormous potential for the production of hydrogen. Revealing the processes of molecular conjugation, nucleation, and crystallization in crystalline carbon nitride is expected to enhance the photocatalytic activity through the creation of isotype heterojunctions and active sites. In this work, the addition of cobalt salts in ionothermal synthesis was found to promote the phase transition of heptazine-based crystalline carbon nitride (CCN) to triazine-based poly (triazine imide) (PTI), resulting in the formation of a single-atom cobalt-doped coordinated isotype CCN/PTI heterojunction. The new hybrid orbital modulates the atomic/electronic structure and the band gap of the CCN/PTI heterojunction, and synergistically increases the absorption of visible light, accelerating the separation and transfer of photoexcited electrons and holes. Synchrotron-based X-ray spectroscopy and microscopy are used to identify the origin of the improved performance of the single-atom cobalt-doped CCN/PTI heterojunction in the photocatalytic hydrogen evolution reaction. This work demonstrates that synchrotron X-ray spectroscopy is a promising tool for designing materials aimed at enhancing photocatalytic activity in solar energy conversion applications. © 2023 Elsevier B.V.

关键词： Carbon nitride

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