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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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Modified Stainless Steel as Anode Materials in Bioelectrochemical Systems

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ACS Symposium Series 2020年 1342卷 165-184页

作者： Pu, Kai-Bo Bai, Ji-Rui Chen, Qing-Yun Wang, Yun-Hai Department of Environmental Science and Engineering Xi'an Jiaotong University Xi'an710049 China State Key Lab of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

As a promising anode material in bioelectrochemical systems (BESs), stainless steel-based bioanodes were reviewed. The anode material must have good biocompatibility, excellent electrical conductivity, large specific surface area, high corrosion resistance, and a low cost. The design of stainless steel-based bioanodes has been the focus of numerous research studies over the past decade. The present chapter summarizes and discusses the recent advances in stainless steel-based bioanodes and their configurations. The stainless steel-based bioanodes will be discussed in terms of optimization of stainless steel structures, carbon modification, metal oxide modification, conductive polymer modification, and others. © 2019 American Chemical Society. All rights reserved.

关键词： Corrosion resistance

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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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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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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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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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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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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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