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Suppression thermal runaway propagation of LiFePO4 batteries during nail penetration test based on liquid immersion cooling

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Energy 2025年 330卷

作者： Xinyu Liu Yang Li Shuai Gao Xuecheng Lv Zhifu Zhou Wei-Tao Wu Lei Wei Jizu Lyu Yubai Li Yongchen Song Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education Dalian University of Technology Dalian 116024 China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China School of Mechanical Engineering Nanjing University of Science and Technology Nanjing 210094 China Department of Mechanical and Energy Engineering Southern University of Science and Technology Shenzhen 518055 China School of Mechanical Engineering Guangdong Ocean University Zhanjiang 524088 China

The thermal safety accidents of high specific energy lithium-ion batteries (LIBs) occur frequently, impeding their further large-scale application in electric vehicles. In this study, the experimental systems for semi-open and sealed spaces are established. Meanwhile, based on the liquid immersion cooling (LIC) system, the thermal runaway (TR) suppression mechanisms of the single LIB and LIB pack are reported systematically. For the single LIB (two pouch cells connected in series), the LIB is penetrated to 50 % depth, namely, the first pouch cell. We discover that the unpenetrated pouch cell remains at 0.58 V and is structurally intact. Compared with the natural convection conditions, the LIB peak temperature is decreased by 141.3 °C. The gas generation reactions are significantly mitigated. Furthermore, the heat and gas generation are gradually decreased with a reduction in state of charge (SOC). More importantly, after penetrating the first LIB in the LIB pack, we observe that the maximum temperature of the neighboring LIB is around 49 °C. The study provides a first step towards LIB thermal safety protection projects.

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Thermoelectric characteristics analysis of TOPAZ-II

Thermoelectric characteristics analysis of TOPAZ-II

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2019 Transactions of the American Nuclear Society, ANS 2019

作者： Dai, Zhiwen Wang, Chenglong Liu, Xiao Zhang, Dalin Qiu, Suizheng Su, Guanghui School of Nuclear Science and Technology Shanxi Engineering Research Center of Advanced Nuclear Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

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Anchoring group regulation in semiconductor/molecular complex hybrid photoelectrode for photoelectrochemical water splitting

Smart Molecules

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Smart Molecules 2024年

作者： Xiangyan Chen Fujun Niu Tongxiang Ma Qingyu Li Shaopeng Wang Shaohua Shen Northwest Institute for Non-ferrous Metal Research Xi'an Shaanxi China School of Advanced Energy Shenzhen Campus of Sun Yat-sen University Shenzhen China State Key Laboratory of Multiphase Flow in Power Engineering International Research Center for Renewable Energy Xi'an Jiaotong University Xi'an Shaanxi China

Rational interface engineering via regulating the anchoring groups between molecular catalysts and light-absorbing semiconductors is essential and emergent to stabilize the semiconductor/molecular complex interaction and facilitate the photocarriers transport, thus realizing highly active and stable photoelectrochemical (PEC) water splitting. In this mini review, following a showcasing of the fundamental details of hybrid PEC systems containing semiconductor photoelectrodes and molecular catalysts for water splitting, the state-of-the-art progress of anchoring group regulation at semiconductor/molecular complex interface for efficient and stable PEC water splitting, as well as its effect on charge transfer kinetics, are comprehensively reviewed. Finally, potential research directions aimed at building high-efficiency hybrid PEC water splitting systems are summarized.

关键词： anchoring groups hybrid systems molecular catalysts photoelectrochemical water splitting semiconductor photoelectrodes

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Experimental research on thermal deviation of high temperature reheater in the single tangential Π type boiler based on radiation spectroscopy analysis 7

Experimental research on thermal deviation of high temperatu...

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7th International Conference on power engineering, ICOPE 2019

作者： Xie, Jianwen Wen, Wubin Yang, Bin Yang, Fei Ping, Li Zhang, Fei Zhang, Jianwen Electric Power Research Institute Co. Ltd. Beijing100025 China Jiangsu Guohua Chenjiagang Power Generation Co. Ltd. Jiangsu Yancheng224631 China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering University of Shanghai for Science and Technology Shanghai200093 China Shanghai Boiler Works Ltd. Shanghai200245 China

The superimposed phenomenon of thermal deviation of low and high temperature reheaters was found under the high load condition in a 660MW ultra super-critical Π type boiler. And the discharge temperature deviation between the two sides of steam were more than 15℃ in high temperature reheater. In order to reveal the thermal deviation of high temperature reheater in this boiler, a probe was designed and developed to measure the visible radiation spectrums of coal dust in the high temperature reheater zone by using the servo mechanism of soot blower. The particle concentration and temperature of coal dust were obtained by the parameter fitting method based on Planck's radiation law. The measurement result shows that the burning delay of pulverized coal caused by originally equipped one-level air staged combustion system and enrichment of coal dust under the action of inertia are the main reasons of thermal deviation of high temperature reheater. And the momentum of SOFA to eliminate the rotation is insufficient in this boiler. In order to improve the thermal balance of both sides, a new type of the two-level air staged combustion system was proposed as principle of retrofit scheme. © ICOPE 2019 - 7th International Conference on power engineering, Proceedings. All rights reserved.

关键词： Coal combustion

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Operational efficiency improvement in a water supply network: Machine learning-enhanced leakage identification and water resource conservation

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Journal of Water Process engineering 2025年 75卷

作者： Liu, Hongbo Zhang, Junbo An, Wenhui Chen, Yang Yuan, Xiang Zhang, Guosheng Lichtfouse, Eric Ma, Jiale Huang, Jin Tu, Yiqian School of Environment and Architecture University of Shanghai for Science and Technology 516 Jungong Road Shanghai 200093 China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Shaanxi Xi'an 710049 China Shanghai Urban Construction Design and Research Institute (Group) Co. Ltd. Shanghai 200125 China

Pipeline ruptures in water supply networks can induce significant water loss and may pose risks of water quality deterioration, including potential contamination by pathogens and pollutants. This issue can be addressed by predicting the location of leakage points in the pipeline network and controlling the leakage. Here we designed a hydraulic model for leakage localization using a genetic algorithm-backpropagation neural network, to predict the leakage points in the water supply system of an exposition area consuming 117,211 m³ of water per day in Eastern China. Then, using the model results, pressure-regulating valves were installed in areas with lower network safety. Results show that the error in predicting the leakage points localization ranged from 14.48 m to 121.69 m. The installation of pressure-regulating valves, reduced the average water pressure from 33.54 m to 32.64 m (2.7 %) and, in turn, decreased the simulated background leakage by 9684 m³ of water per day. Compared to traditional acoustic-based methods, the proposed machine learning approach enables more accurate leak localization by leveraging pressure variation features. © 2025 Elsevier Ltd

关键词： Pipeline leakage Point leakage model Pressure monitoring Pressure regulating valve Supply water

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Analysis of electric vehicle development based on optimization model

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Energy Procedia 2019年 158卷 2841-2846页

作者： Qian Cheng Xiaonan Lu Haibo Dai Jinshi Wang State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an 710049 China

The new energy electric vehicles can dramatically relief the environmental pollution problem caused by fuel automobiles. Based on the environmental and economic factors, this paper constructs an optimization model on the number of charging stations. Under the premise of minimizing the capacity of charging station, the optimal allocation of cities, suburbs and countryside is obtained. According to the site-selecting principles, South Korea is taken as a sample. Based on the station-building optimization model, when the conversion of electric-powered vehicle has fully realized, the number of stations should be 874524. In addition, based on the station-building cost optimization model, the number of stations in city area is 23796. In consideration of economic factors, Logistic model is built to evaluate the converting progress of South Korea, and the conclusion illustrates that it will take at least 8~17 years (from 10% to 100%).

关键词： Sustainable Development Logistic model Multiobjective optimization

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Statistical characterization of gas-liquid flow in swirl vane separator with image processing technique 18

Statistical characterization of gas-liquid flow in swirl van...

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

作者： Liu, Li Bai, Bofeng School of Nuclear Science and Engineering Shanghai Jiao Tong University Shanghai200240 China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Shaanxi710049 China

Swirl vane separator is not only used in SG for separating more than 80% of liquid water from steam-water mixture to feed qualified steam to dryers and turbines, but also applied in the thorium molten salt reactor to remove dilute dispersed bubbles from reactor coolant. The proper design and operation of swirl vane separator requires a fundamental understanding of the gas-liquid flow pattern in the system, since the mass, momentum, and energy transfer rates and processes are quite sensitive to the distribution of the phases within the flow. This paper presents a comprehensive experimental study aimed at classifying flow patterns in the condition of swirling gas-liquid flow in a downscale swirl vane separator. While a large amount of work has been done on conventional, non-swirling, two-phase flow in small pipes, investigations on swirling flow regime classification are still scarce. Here, optical and image processing techniques are used to measure gas and liquid holdup in the system through time. Detailed qualitative description of the flow regimes observed in the experiment is provided. The temporal statistics of liquid holdup (PDF and CPDF) are also analyzed to characterize and distinguish the various swirling flow regimes objectively. Based on this study, the influence of centrifugal force on phase distribution of gas-liquid flow was clarified and the general relationship between swirling gas-liquid flow and non-swirling gas-liquid flow was gained. © 2019 American Nuclear Society. All rights reserved.

关键词： Image processing

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

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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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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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