检索结果-内蒙古大学图书馆

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

来源：评论

学校读者我要写书评

暂无评论

A bundle CHF mechanism model and its preliminary verification under PWR conditions 18

A bundle CHF mechanism model and its preliminary verificatio...

引用

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

作者： Liu, Yang Shan, Jianqiang Zhang, Bo Liu, Wei State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University No. 28 Xianning West Road Xi'an Shaanxi Province710049 China Nuclear Power Institute of China State Key Laboratory of System Desgin Technology Chengdu Sichuan Province610213 China

A bundle mechanistic model to predict critical heat flux (CHF) over a pressurized water reactor (PWR) operating range in flow boiling has been proposed based on a concept of the bubble crowding in the wall bubbly layer. The new bundle mechanistic model has the following differences with the original tube model proposed by Weisman & Pei. Firstly,the radial velocity distribution within the bundle was used to derive the radial turbulence intensity factor ib instead of the velocity distribution inside the tube. Secondly, a grid enhancement factor was introduced to quantify the effect of grid on CHF enhancement, based on the measurement experiment of the turbulence intensity factor ib with grid. Thirdly, for the turbulence intensity factor ib, the new model considers the influence of pressure and mass flow rate under two phases, and the original ib only considers the influence of mass flow rate. Finally, the new established bundle CHF mechanism model was verified by comparing with the typical PWR CHF data. © 2019 American Nuclear Society. All rights reserved.

关键词： Heat flux

来源：评论

学校读者我要写书评

暂无评论

Thermoelectric characteristics analysis of TOPAZ-II

Thermoelectric characteristics analysis of TOPAZ-II

引用

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

来源：评论

学校读者我要写书评

暂无评论

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

引用

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

来源：评论

学校读者我要写书评

暂无评论

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

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

引用

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

来源：评论

学校读者我要写书评

暂无评论

Numerical study on the thermal stratification phenomenon in the sodium-cooled fast reactor

Numerical study on the thermal stratification phenomenon in ...

引用

2019 Transactions of the American Nuclear Society, ANS 2019

作者： Zhang, Dalin Wang, Shibao Qiu, Suizheng Su, Guanghui School of Nuclear Science and Technology State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University No.28 Xianning West Road Xi'an710049 China

来源：评论

学校读者我要写书评

暂无评论

Optimization of thermal spray parameters of nial/cr2c3 coating by taguchi method

Optimization of thermal spray parameters of nial/cr2c3 coati...

引用

Asia Conference on Material and Manufacturing Technology, ACMMT 2018

作者： Tahari, M. Luo, B. Geng, J. Jing, D. Hatami, M. EsfarayenNorth Khorasan Iran International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

ISBN: (纸本)9783035714050

In this study the effect of thermal spray process on wear resistance of NiAl/Cr2C3 thermal spray coating has been investigated. For this purpose the NiAl power mixed with 10 %wt. Cr2C3 powder and milled for 1 hrs at argon atmosphere. The APS parameters such as voltage (V), current(A), spray distance (mm), powder feed rate (gr/min), were optimize using a response surface methodology. For investigation effect of spray parameters on quality of coatings, the porosity and wear resistance of coatings analyzed with SEM and pin on disk wear test. Results show that increase of voltage and current are more effective other parameters. Increasing of powder feed rate and spray distance raised porosity of coatings intensively. © 2019 Trans Tech Publications Ltd, Switzerland.

关键词： Taguchi methods

来源：评论

学校读者我要写书评

暂无评论

Electrocatalytically Activating and Reducing N2Molecule by Tuning Activity of Local Hydrogen Radical

引用

Angewandte Chemie 2023年第20期135卷

作者： Yuanyuan Yang Cejun Hu Dr. Jieqiong Shan Chuanqi Cheng Prof. Lili Han Prof. Xinzhe Li Ruguang Wang Prof. Wei Xie Prof. Yao Zheng Prof. Tao Ling Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education Tianjin Key Laboratory of Composite and Functional Materials School of Materials Science and Engineering Tianjin University Tianjin 300072 China Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Tianjin Key Lab of Molecular Recognition & Biosensing Renewable Energy Conversion and Storage Center College of Chemistry Nankai University Tianjin 300071 China School of Chemical Engineering The University of Adelaide Adelaide SA 5005 Australia State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou 350002 China State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi'an Jiaotong University Xi An Shi Xi'an 710049 China

Decarbonizing N 2 conversion is particularly challenging, but essential for sustainable development of industry and agriculture. Herein, we achieve electrocatalytic activation/reduction of N 2 on X/Fe−N−C (X=Pd, Ir and Pt) dual-atom catalysts under ambient condition. We provide solid experimental evidence that local hydrogen radical (H*) generated on the X site of the X/Fe−N−C catalysts can participate in the activation/reduction of N 2 adsorbed on the Fe site. More importantly, we reveal that the reactivity of X/Fe−N−C catalysts for N 2 activation/reduction can be well adjusted by the activity of H* generated on the X site, i.e., the interaction between the X−H bond. Specifically, X/Fe−N−C catalyst with the weakest X−H bonding exhibits the highest H* activity, which is beneficial to the subsequent cleavage of X−H bond for N 2 hydrogenation. With the most active H*, the Pd/Fe dual-atom site promotes the turnover frequency of N 2 reduction by up to 10 times compared with the pristine Fe site.

关键词： Carbon Materials Electrocatalysis Metal-Free Catalysts Nitrogen Reduction Reaction

来源：评论

学校读者我要写书评

暂无评论

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

引用

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

来源：评论

学校读者我要写书评

暂无评论

Tapered optical fiber photocatalysis enhances hydrogen production

引用

Nano Energy 2025年 142卷

作者： Wenshuo Yao Xueli Yan Feng Liu Shidong Zhao Zhongyuan Li Yi Wang Yitao Si Maochang Liu International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an Shaanxi 710049 P R China School of Chemistry and Chemical Engineering Southeast University Nanjing Jiangsu 211189 P R China Suzhou Academy of Xi’an Jiaotong University Suzhou Jiangsu 215123 P R China

Optical fibers offer a promising platform for photocatalytic reactions owing to their low resistance to light-mass transfer. However, light energy diminishes during propagation, leading to uneven catalyst interaction along the fiber surface. Here, we report a photocatalytic water splitting system using a tapered optical fiber coated with Cd 0.5 Zn 0.5 S as a model photocatalyst. Tapering the fiber intensifies light distribution, primarily directing it from the sides, thereby significantly enhancing light-catalyst interaction. Compared to conventional optical fiber, the tapered fiber leads to an obvious enhancement towards hydrogen production. This work demonstrates the effectiveness of tapered optical fiber photocatalysis, providing a novel proof-of-concept for photocatalytic hydrogen production.

关键词：

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：