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Design Optimization of Boiler Tail Flue in Supercritical Carbon Dioxide power Generation System

Mechanical engineering Science 2021年第2期3卷 9-16页

作者： Wenli YE Jinliang XU Guanglin LIU Beijing Key Laboratory of Multiphase Flow and Heat Transfer for Low Grade Energy Utilization North China Electric Power UniversityBeijingChina Key Laboratory of Power Station Energy Transfer Conversion and System North China Electric Power UniversityMinistry of EducationBeijingChina

The S-CO_(2) top-bottom combined cycle based on overlap energy utilization can lead to excessive heating area,due to the small temperature difference and the large thermal load for the heating surface at the tail of the ***,reasonable optimization indexes are needed for design *** optimization indexes include heating area and working medium pressure drop,but lower working medium pressure drop usually leads to large heating area,for example,with the increase of tube inner diameter or boiler width,the pressure drop decreases but the heating area ***,if both are used as optimization indexes,it will be difficult to choose the optimum tube inner diameter and boiler *** this paper,exergy loss analysis is used,in combination with economic analysis,the optimization index is unified to the cost per unit heat transfer of the heating *** thermal calculation and pressure drop calculation models are established for the heating surface at the tail of the *** optimized heating surface can greatly improve the economic benefit.

关键词： S-CO_(2)cycle calculation model exergy loss analysis optimization of the boiler

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Core-shell Ag-Pt nanoparticles:A versatile platform for the synthesis of heterogeneous nanostructures towards catalyzing electrochemical reactions

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Chinese Chemical Letters 2021年第11期32卷 3288-3297页

作者： Danye Liu Niuwa Yang Qing Zeng Hui Liu Dong Chen Penglei Cui Lin Xu Chaoquan Hu Jun Yang State Key Laboratory of Multiphase Complex Systems and Center of Mesoscience Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Nanjing IPE Institute of Green Manufacturing Industiy Nanjing 211100China School of Chemistry and Materials Science Jiangsu Key Laboratoiy of New Power BatteriesNanjing Normal UniversityNanjing 210023China

Heterogeneous nanostructures that are defined as a hybrid structure consisting of two or more nanoscale domains with distinct chemical compositions or physical characteristics have attracted intense efforts in recent *** this review,we focus on the introduction of a number of heterogeneous nanostructures derived using core-shell Ag-Pt nanoparticles as starting materials,including hollow,dimeric and composite structures and also highlight their application in catalyzing electrochemical reactions,e.g.,methanol oxidation reaction and oxygen reduction *** review not only shows the capability of core-shell Ag-Pt nanoparticles in producing various heterogeneous nanostructures as starting templates,but also highlights the structural design or electronic interaction that endows the heterogeneous nanostructures with enhanced catalytic properties either in methanol oxidation or in oxygen ***,we also make some perspectives for more heterogeneous nanostructures that may be prepared by using core-shell Ag-Pt particles or their derivatives so as to offer the readers the opportunities and challenges in this field.

关键词： Heterogeneous nanostructures Core-shell Electrochemical reaction Methanol oxidation reaction Oxygen reduction reaction

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Corrigendum to ‘Experimental investigation of the microlayer and dry spot dynamic characteristics in a small channel flow boiling by laser interferometry method’ [International Journal of Heat and Mass Transfer 201 (2023) 123585]

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International Journal of Heat and Mass Transfer 2023年 209卷

作者： Zhong-Xiang Shen Ming Gao Wu-han Dong Li-xin Zhang Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering School of Energy and Power Engineering University of Shanghai for Science and Technology Shanghai 200093 China

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Fluoride-Salt-Cooled High-Temperature Reactor: An Integrated Nuclear-Based Energy Production and Conversion System

SSRN

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SSRN 2023年

作者： Zhang, Dalin Li, Xinyu Jiang, Dianqiang Zhou, Xingguang Lv, Xindi Yun, Shichang Wu, Wenqiang He, Xuanang Li, Haoyang Min, Xin Chen, Kailong Tian, Wenxi Qiu, Suizheng Su, Guanghui Zhao, Quanbin Fu, Yao Tang, Chuntao Zhuo, Wenbin Li, Jinggang Zuo, Jiaxu State Key Laboratory of Multiphase Flow in Power Engineering Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology School of Nuclear Science and Technology Xi’an Jiaotong University Xi’an710049 China Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai201800 China Shanghai Nuclear Engineering Research & Design Institute Co. Ltd. Shanghai200233 China CNNC Key Laboratory on Nuclear Reactor Thermal Hydraulics Technology Nuclear Power Institute of China Chengdu610213 China China Nuclear Power Technology Research Institute Guangdong Shenzhen518000 China Nuclear and Radiation Safety Center Ministry of Ecology and Environment Beijing100082 China

Based on the analysis of energy structure and the development trends of advanced nuclear energy technology, combining the complementary advantages of nuclear energy and other energy sources in China, the Fluoride-salt-cooled High-temperature Reactor(FuSTAR) system has been proposed. FuSTAR system is designed to address production capacity issues in areas with energy shortages or resource concentration and can be combined with high-temperature process heat to achieve high-value-added processes such as hydrogen production. In this paper, the design and optimization processes of FuSTAR are described from three aspects: the neutronic and thermal-hydraulic system, the thermal transport system, and the power cycle system. Tri-structural isotropic fuel combined with helical cruciform elements has been studied in detail on the neutron physics and thermal-hydraulic properties, and the flow and heat transfer experiment is carried out for the first time. The multilayer nonlinear programming method has been applied to the design of thermal transport systems and the passive residual heat removal system and proved to be fast and efficient. Then the optimal parameters and configuration of the thermoelectric conversion system are obtained directly by using the superstructure optimization method, which saves computing resources greatly. Based on the above design and parameters, the inherent safety of FuSTAR is demonstrated through deterministic safety analysis. In addition, the iodine-sulfur cycle technology is also designed and analyzed, and the characteristics of tritium production in FuSTAR are calculated. The research provides important guidance for the detailed design and operation of FuSTAR. Moreover, this study highlights the significant potential of integrating nuclear energy with other energy sources in an optimized energy-production system. Based on the current research findings, prospects for future research directions are also suggested. © 2023, The Authors. All rights r

关键词： High temperature reactors

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Experimental study on safe operation state of W-shaped flame boiler 7

Experimental study on safe operation state of W-shaped flame...

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7th International Conference on power engineering, ICOPE 2019

作者： Wen, Du Yao, Yashu Li, Lian Zhou, Qulan Li, Na Deguchi, Yoshihiro State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China Graduate School of Advanced Technology and Science Tokushima University Tokushima770-8501 Japan

To get more acknowledges about W-shaped flame boiler, scaled down experiment system was set up to collect the basic data about temperature, strain, stress, shear and heat flux distribution of W-shaped flame boiler. The results showed that temperature distribution is mainly decided by the distance of the flame. Area which is washed against by flame shows high temperature. The temperature on the front wall is higher than rear wall, especially on the connection zone between furnace chamber and upper ash hopper. Heat flux distribution is dominated by both radiation and convective heat transfer. High heat flux zone is surrounding the burners and it is decided by temperature in furnace chamber. Medium heat flux zone is along the route of the gas fume and it is decided by gas fume's convective heat transfer. Strain distribution is well matched with temperature distribution especially in high strain zone. And the magnitude of stress depends on temperature gap, but the direction depends on both temperature gap and external constraints. In this experiment, we find that front wall is more vulnerable than other walls especially on the connection zone between furnace chamber and upper ash hopper. It is of high value on boiler safety operating and on optimization of the furnace chamber's structure. © ICOPE 2019 - 7th International Conference on power engineering, Proceedings. All rights reserved.

关键词： Temperature distribution

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Thermodynamic and Thermo-economic analysis of a Carnot battery coupled with LNG cold energy power generation

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Journal of Energy Storage 2025年 129卷

作者： Shiyu Liu Rui Ye Manzheng Zhang Zheng Miao China Electric Power Planning and Engineering Institute (EPPEI) 100120 Beijing China The Beijing Key Laboratory of Multiphase Flow and Heat Transfer North China Electric Power University 102206 Beijing China

The thermodynamic and thermo-economic analyses are carried out in the present work for a low-temperature Carnot battery (CB) system, which integrates LNG cold energy and power generation with the organic Rankine cycle (ORC). The influence of operating parameters on system performance was discussed and analyzed. The exergy efficiency in combination with power-to-power (P2P) efficiency and energy storage density is optimized through multi-objective optimization. Although the total cost of the LNG-CB is much higher than the basic CB, the dramatic increase in the power output of the LNG-CB provides a significant superiority in both the thermodynamic and thermo-economic performance. The P2P efficiency of the LNG-CB is 2.3–4.5 times higher than the basic CB, while the levelized energy cost ( LEC ) of the LNG-CB is lower than half. The higher LNG pressure, higher component isentropic efficiency, lower pinch point temperature difference (PPTD), lower heat storage temperature, and higher heat storage temperature difference are preferable to improve the system performance. The LNG-CB achieves the maximum P2P efficiency of 258.91 %, the maximum exergy efficiency of 39.44 %, and the minimum LEC of 0.019 $/kWh at the PPTD of 5 °C, the heat storage temperature difference of 70 °C, and the isentropic efficiencies of 94 and 92 for the expander and compressor. The distributions of the Pareto front under different LNG pressures are similar, with the system performing best at the LNG pressure of 7 MPa.

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Realization of Multilocal Gradient-Doping Pcn by Alkali Metal Ion Sustained Release Capsules for Enhanced Photocatalytic Water Splitting

SSRN

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SSRN 2023年

作者： Yan, Jiawei Fang, Fenjian Wei, Zhidong Chi, Jiasheng Chen, Mingxia Jiang, Zhi Jiang, Kun Shen, Shaohua Shangguan, Wenfeng Research Center for Combustion and Environment Technology Shanghai Jiao Tong University Shanghai200240 China College of Smart Energy Shanghai Jiao Tong University Shanghai200240 China College of Electrical Energy and Power Engineering Institute of Fuel Cells Shanghai Jiao Tong University Shanghai200240 China International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi’an710049 China

The gradient-doping technique has been widely applied to induce an oriented built-in electric-field. However, it is still not efficient enough for charge mobility especially for particulate semiconductors, as the field is primarily in one direction from inner to surface. Here, we propose a multilocal gradient-doping technique that a nano-capsule is designed to store dopants and then release them into semiconductors nonuniformly. As an illustration, scattered pyrochlore-type K2Ta2O6 nanoparticles have been validated the capability of storing and releasing K+, which subsequently diffuse into the substrate PCN. Multi point-radiative gradient in K+ concentration, confined within the K2Ta2O6’s vicinity, will construct several 3D potential wells which can not only accelerate the carrier separation but also offer more migration channels for both photo-induced electrons and holes to the surface. Consequently, the multilocal K+ gradient-doping PCN shows the longest carriers’ lifetime and highest AQY (~21.8% at 400 nm) compared with the other uniformly doping techniques. © 2023, The Authors. All rights reserved.

关键词： Charge transfer

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Unique Z-Scheme TiO2 Homojunction Enabling Photocatalytic Water Splitting with Unit Quantum Efficiency

SSRN

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SSRN 2023年

作者： Lu, Kejian Guan, Xiangjiu Liu, Feng Fu, Yiwei Peng, Hao Hu, Anlan Huang, Jie Yu, Fangbo Zhang, Chunyang Xue, Fei Fu, Wenlong Liu, Maochang InternationalResearchCenter for Renewable Energy State Key Laboratory ofMultiphase Flow in Power Engineering Xi’an Jiaotong University Shaanxi710049 Xi’an China Suzhou Academy ofXi’an Jiaotong University Jiangsu Suzhou215123 China

TiO2 appears as the most widely investigated semiconductor photocatalyst for solar water splitting, yet with limited success approaching the upper limit of quantum efficiency. Promising performance could be expected from optimizing crystal and electronic structures via modulating Ti-O coordination, with respect to overcoming the obstacles from poor charge transfer behaviour and inferior surface reaction kinetics, while remaining as a significant challenge. Herein, we demonstrate a novel defect-rich Z-scheme TiO2 homojunction photocatalyst by precisely thermodynamically regulated one-step symbiotic phase transition. The Z-scheme TiO2 promises a remarkable H2 evolution rate (2.20 mmol h-1) with a quantum efficiency of 99.24% at 350 nm. Detailed analysis indicates the electronic interactions and redistribution induced by the modification of Ti-O coordination, which contributes to establishing a unique charge transfer via Z-scheme mode and an activated surface to break through the kinetic barrier of water oxidation for achieving overall water splitting. © 2023, The Authors. All rights reserved.

关键词： Titanium dioxide

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Load cycling rate of power-to-heat molten salt thermal storage and power generation system: Dynamic modeling and performance evaluation

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Journal of Energy Storage 2025年 125卷

作者： Hu, Wenting Liu, Ming Zhang, Jihong Zhang, Shunqi Yan, Junjie State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China Xi'an Thermal Power Research Institute Co. Ltd. Xi'an710054 China

To develop a low-carbon power system with high renewable energy penetration, this study proposes a novel power-to-heat energy storage and power generation (P2HES-PG) system, which utilizes molten salt thermal storage technology to achieve flexible heat-power decoupling and rapid load regulation. By establishing dynamic models, the rapid load cycling dynamic characteristics and exergy destruction evolution of the P2HES-PG system under different load ranges were investigated. The results demonstrate that, within a 25% THA amplitude, the maximum load down rates in the high, medium, and low load ranges are 15%, 12%, and 11% Pe min−1, respectively, while the maximum load up rates reach 17%, 14%, and 11% Pe min−1, exceeding the ramping rate of conventional power units. During load cycling processes, significant fluctuations in molten salt circulation flowrate were observed, directly affecting the thermal storage/release dynamics of the steam generator (SG) and the system's thermal performance. Dynamic exergy analysis indicates the condenser maintains a stable 20% exergy destruction share, while turbine and mechanical contributions increase with higher loads, and the regenerative system peaks at 13.97% during the low-load range loading down process. The SG exhibits lower exergy destruction than ideal conditions during the loading down process and higher destruction during the loading up process, providing a theoretical basis for optimizing system control strategies and improving system variable load energy efficiency. © 2025 Elsevier Ltd

关键词： Electric power plant loads

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聚丙烯酸酯修饰铜电极用于电化学二氧化碳还原选择性生成多碳产物（英文）

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Science Bulletin 2024年第15期 2395-2404页

作者：石玉川张凯妮董崇礼 Ta Thi Thuy Nga 汪淼魏代星王佳琳王亦清沈少华 International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Department of Physics Tamkang University

Highly selective production of value-added multicarbon(C2+) products via electrochemical CO2reduction reaction（eCO2RR） on polycrystalline copper（Cu） remains ***,the facile surface modification using poly（α-ethyl cyanoacrylate）(PECA) is presented to greatly enhance the C2+selectivity for eCO2RR over polycrystalline Cu,with Faradaic efficiency（FE） towards C2+products increased from30.1% for the Cu electrode to 72.6% for the obtained Cu-PECA electrode at -1.1 V *** hydrogen electrode（RHE）.Given the well-determined FEs towards C2+products,the partial current densities for C2+production could be estimated to be-145.4 mA cm-2for the Cu-PECA electrode at -0.9 V *** in a homemade flow ***-situ spectral characterizations and theoretical calculations reveal that PECA featured with electron-accepting-C≡N and-COOR groups decorated onto the Cu electrode could inhibit the adsorption of *H intermediates and stabilize the *CO intermediates,given the redistributed interfacial electron density and the raised energy level of d-band center（Ed） of Cu active sites,thus facilitating the C-C coupling and then the C2+selective *** study is believed to be guidable to the modification of electrocatalysts and electrodes with polymers to steer the surface adsorption behaviors of reaction intermediates to realize practical eCO2RR towards value-added C2+products with high activity and selectivity.

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