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International Conference on Computer Distributed Control and Intelligent Environmental Monitoring

作者： Huang, Jun Huang, Yan-Ping Ma, Jian Wang, Qiu-Wang Key Laboratory of Bubble Physics and Natural Circulation Nuclear Power Institute of China Chengdu China China State Key Laboratory of Multiphase Flow in Power Engineering Xi'An Jiaotong University Xi'an China

ISBN: (纸本)9780769543505

The heat transfer enhancement of Longitudinal Vortex (LV) is a kind of technology with efficiency is high and resistance is low. The effective influence distance of LV is very important to extend this kind of technology in narrow rectangular channels under water medium. CFX1..0 is used to simulate this question, and three velocity components of water flow have been used to define the strength of LV. The results of this calculate method are compared with the experimental results of thermal infrared imager and phase doppler particle analyzer, and they are reasonable. In this paper range, the effective influence distance of LV is bigger than 33 times of Longitudinal Vortex Generators (LVGs) height. © 201. IEEE.

关键词： flow of water

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EFFECT OF BLENDING STRAW POWDER INTO COAL GANGUE ON LOADING-UP CHARACTERISTICS OF THE CIRCULATING FLUIDIZED BED GENERATOR UNIT

EFFECT OF BLENDING STRAW POWDER INTO COAL GANGUE ON LOADING-...

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ASME 2024 power Conference, power 2024

作者： Zhao, Chenyu Wang, Chaoyang Liu, Ming Liu, Jiping Yan, Junjie MOE Key Laboratory of Thermal Fluid Science Engineering Xi'an Jiaotong University Xi'an China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an China

ISBN: (纸本)9780791888186

To increase the contribution to the regional environment, the feasibility of blending agricultural residues was explored by a circulating fluidized bed (CFB) generator unit using coal gangue as the single fuel. In this study, straw powder was chosen to blend into the coal gangue, and the whole thermal system was built as a dynamic model based on self-programming and GSE software. Blending affects the load-increasing process from 75 % to 1.0 % rated power (Pe) with a load variation rate of 1.% Pe/min. With the blended fuel, the deviation of the output power was almost unchanged, and the maximum deviation of the live steam pressure was reduced by 0.04 MPa. With the blending ratios of 1. % and 20 %, the energy efficiencies of the whole unit were improved by 0.48% and 0.81., respectively, the accumulative deviations of live steam temperature were reduced by 1..4% and 1..5%, respectively, the accumulative deviations of reheat steam temperature were reduced by 1..3% and 1..2% respectively, and the maximum deviations of bed temperature were increased to 8.9 ℃ and 9.5 ℃ respectively. The increased fluctuations in bed temperature are still far from the safe boundary, so the CFB generator unit can safely load up with the blending ratios of 1. % and 20 %. Copyright © 2024 by ASME.

关键词： Coal

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Hydrogen production from sludge in supercritical water and its energy evaluation

Hydrogen production from sludge in supercritical water and i...

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5th International Energy Conversion engineering Conference

作者： Qinming, Zhang Shuzhong, Wang Liang, Wang Donghai, Xu Lingling, Lu State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China Department of Thermal Engineering Xi'an Jiaotong University AIAA

ISBN: (纸本)1563479028

Gasification of high moisture content biomass in supercritical water has been identified as a promising alternative system for producing renewable hydrogen. Supercritical water partial oxidation is the process by which an oxidant appears during the reaction. The key advantage of this process is the rapid heating of the gasification medium, resulting in less char formation and improved hydrogen yield. Many researchers have studied the supercritical water gasification of model compounds. However, real biomass which is of importance for large production of hydrogen has yet to be thoroughly examined. In this paper, gasification of high moisture content municipal sludge was studied in a continuous reactor employing hydrogen peroxide as an oxygen source. The reaction was tested across temperatures and pressures in the range of 673 to 873 K and 24 to 30 MPa, and across various residence times ranging from 3 to 1. minutes. We found that sludge at low concentrations can be completely gasified with no observable char or tar formation. The improvement of gasification efficiency by partial oxidation was accompanied with a high yield of hydrogen and carbon monoxide. Through this, we evaluated the energy efficiency of sludge gasification. Our thermodynamic calculations show that the energy efficiency reaches 50% when considering hydrogen, carbon monoxide, and methane as the valuable gases in the ideal case. Taking into account the energy recovery from the hot water at 30 MPa and 873 K and assuming the ideal scenario of no external heat loss, the overall energy yield potentially reaches 85%. Our results show that the key mechanism of the gasification process is energy recovery, as the chemical reaction is endothermic and requires high temperatures.

关键词： Hydrogen production

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A universal charge-compensating strategy for high-energy-density pseudocapacitors

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Journal of Energy Chemistry 2023年第3期78卷 333-339,I0010页

作者： Baoyi Yin Jiaqi Zhang Yuanhui Su Yu Huan Liang Hao Chen Wang Xun Hu Tao Wei School of Material Science and Engineering University of Jinan336 Nanxinzhuang West RoadJinan 250022ShandongChina School of Microelectronics Dalian University of TechnologyDalian 116024LiaoningChina Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering School of Energy and Power EngineeringUniversity of Shanghai for Science and TechnologyShanghai 200093China State Key Laboratory of ASIC and Systems School of MicroelectronicsFudan UniversityShanghai 200433China

For pseudocapacitive electrode materials(PseEMs),despite much progress having been made in achieving both high power density and high energy density,a general strategy to guide the enhancement of intrinsic capacitive properties of PseEMs remains ***,we demonstrate a universal chargecompensating strategy to improve the charge-storage capability of PseEMs intrinsically:ⅰ) in the electrolyte with anion as charge carriers(such as OH-),reducing the multivalent cations of PseEMs into lower valences could create more reversible low-to-high valence redox cou ples to promote the intercalation of the anions;ⅱ) in the electrolytes with cation as charge carriers(such as H^(+),Li^(+),Na^(+)),oxidizing the multivalent cations of PseEMs into higher valences could introduce more reversible high-to-low valence redox couples to promote the intercalation of the *** we demonstrated that the improved intrinsic charge-storage capability for PseEMs originates from the increased Faradaic charge storage sites.

关键词： Supercapacitors Universal charge-compensating strategy Changed valence state Increased Faradaic charge storage sites

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Study on the effect of particle flow {1. on the stability of LIBS carbon content detection signal 7

Study on the effect of particle flow state on the stability ...

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7th International Conference on power {1., ICOPE 201.

作者： Pan, Yuqing Hu, Zhengtao Xu, Heng 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 Engineering Science Osaka University Japan

Rice husk, a type of biomass fuel, is rich in amorphous silica. Laser-induced breakdown spectroscopy (LIBS) is a fast-responding non-contact detection method which can realize on-line detection of rice ash components. This paper aims to explore the optimum working conditions of LIBS and extend the compatibility of LIBS technology. The paper uses the sample motion state simulation system to simulate ash, so that the particles can be laser-induced breakdown during the vertical drop and horizontal motion, and then the effect of particle {1. state on the stability of the LIBS detection signal can be determined. In addition, the paper compares the effects of two laser pulse widths on the stability of LIBS detection signal by using a 1.ns pulse width laser and a 6 ns pulse width laser to improve the detection error. Experimental studies have found that long pulse width laser provides better stability of spectrum, and the relative standard deviation (RSD) of the detection result is smaller than that of short pulse width laser, and the RSD is smaller in the state of horizontally transferring samples, which can obtain the spectral signal with stronger line intensity. Moreover, sample in conveyor, by contrast, leads to more stable signals. © ICOPE 201. - 7th International Conference on power engineering, Proceedings. All rights reserved.

关键词： Stability

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Dryout point prediction model for bilaterally heated vertical narrow annuli under low flow conditions

Dryout point prediction model for bilaterally heated vertica...

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25th Annual CNS Conference - Nuclear Energy: Meeting the Challenges

作者： Myint, Aye Tian, Wenxi Li, Zhihui Hao, Li Jia, Dounan State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi'an Jiaotong University No.28 Xianning West Road Xi'an City 710049 China

ISBN: (纸本)0919784798

Prediction of dryout point was experimentally investigated with deionized water upflowing through narrow annular channel with 1.0 mm and 1.5 mm gap respectively. The annular with narrow gap was bilaterally heated by AC current {1. supply. The experimental conditions covered a range of pressure from 0.8 to 3.5 MPa, mass flux of 60.39 to 1.5.6 kg/m2 and heat flux of 5 to 50 kW/m2 This paper presents a new analytical model for the prediction of dryout point for steam- water flow in narrow annular gap and bilaterally and uniformly heated tubes. The prediction of dryout point for bilaterally heated annuli was based on the droplet-diffusion model for internally heated annuli by Kirillov and Smogalev (1.69, 1.72). The dryout model prediction values are compared with a experimental data, showing a good agreement in accuracy for the above mentioned parametric range.

关键词： Nuclear power plants

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Research on EM pulse protection property of plasma-microwave absorptive material-plasma sandwich structure

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Science China(Technological Sciences) 2010年第12期53卷 3221-3224页

作者： YUAN ZhongCai & SHI JiaMing state {1. laboratory of Pulse power Laser Technology, {1. Lab of Infrared and Low Temperature Plasma of Anhui Province, Hefei Electronic engineering Institute, Hefei 230037, China 1. State Key Laboratory of Pulse Power Laser Technology Key Lab of Infrared and Low Temperature Plasma of Anhui Province Hefei Electronic Engineering Institute Hefei 230037 China

A plasma-microwave absorptive material (MAM)-plasma sandwich structure is presented to protect the electronic device against high power electromagnetic pulse. The model of electromagnetic wave reflected by and transmitting through the structure is established. Based on the characteristic parameters of plasma generated by discharge and usual MAM, the electromagnetic transmissive properties of the sandwich structure are investigated by the method of finite difference in time domain. The results indicate that in a rather broad frequency range, the electromagnetic attenuations by the structure are obviously better than the sum of attenuations resulted from plasma and MAM respectively. The models and results presented are instructive for electromagnetic pulse protection.

关键词： plasma microwave absorptive material (MAM) sandwich structure electromagnetic pulse finite difference time domain

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Hydrogen production by biomass gasification in supercriticor subcritical water with Raney-Ni and other catalysts

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中国高等学校学术文摘·能源与动力工程 2009年第4期3卷 456-464页

作者： Aixia PEI Lisheng ZHANG Bizheng JIANG Liejin GUO Ximin ZHANG Youjun LV Hui JIN Zhongyuan Petroleum Company Puguang Natural Gas Treating Plant Sinopec Dazhou 636156 China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

Gasification of peanut shell, sawdust and straw in supercritical or subcritical water has been studied in a batch reactor with the presence of a series of Raney-Ni and its mixture with ZnCl2 or Ca(OH)2. The main gas products were hydrogen, methane, carbon dioxide, and a small amount of carbon monoxide. Different types of Raney-Ni, containing different metal components such as Fe, Mo or Cr, have different influences on the gasification yield and hydrogen selectivity. The catalysis effect can be improved obviously by adding ZnCl2 or Ca(OH)2 Increasing the reaction temperature or adding ZnCl2 and Ca(OH)2 could improve the mass of H2 in gas products and reduce the mass of CH4 and CO2 at the same time. The possible mechanism is that ZnCl2 can decompose the biomass particle by accelerating cellulose hydrolyzation in high-temperature water, increasing more specific surface to admit catalysts, while Ca(OH)2 can absorb CO2 to produce CaCO3 deposit, which can drop out from the reactant system, and which will drive the reaction to get more hydrogen. With respect to the biomass conversion to gas product and selectivity of H2 at low temperature, the series of Raney-Ni has shown many advantages over other catalysts; thus, this kind of catalyst has great potential to be utilized in the hydrogen industry for the gasification of biomass.

关键词： biomass catalyst gasification Raney-Ni supercritical water hydrogen

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The role of rotary liquid-solid two-phase flow in the synergistic behavior between sand erosion and electrochemical corrosion of Ni 2 FeCrMo 0.2 alloy in marine environment

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Process Safety and Environmental Protection 2025年 200卷

作者： Xingqi Luo Qipeng Xu Kai Wang Jianjun Feng Yanhui Li Yan Liu Xiya Zhang State Key Laboratory of Water Engineering Ecology and Environment in Arid Area Xi’an University of Technology No.5 Jinhua South Road Xi’an 710048 China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University No.28 Xianning West Road Xi’an 710049 China Qinghai Salt Lake Industry Co. Ltd. No.28 Huanghe Road Golmud 816000 China

The erosion-corrosion behavior poses a significant threat to marine equipment, driven by complex multi-physics processes such as sand movement, surface erosion, electrochemical reactions, and corrosive ion transport. Aiming at the widely used rotating liquid-solid two-phase flow system in a marine environment, this study investigates the role of flow velocity in the erosion-corrosion behavior of Ni 2 FeCrMo 0.2 alloy. The coupling analysis of multi-component weight loss, electrochemical kinetics, and microstructure characterization clarifies the interactions between fluid flow, sand migration, ion transfer, and damage morphology, revealing the synergistic erosion-corrosion mechanism. The results show that the erosion-corrosion mechanism transfers with flow velocity. At low velocities, the erosion effect on the harder metal matrix is weak due to insufficient kinetic energy of the sand particles. However, the sand-surface impingement on the softer corrosion products and the mass transfer of corrosive ions lead to erosion-enhanced corrosion, which dominates the material damage process. In contrast, at higher velocities, the impact kinetic energy and frequency of sand particles rise, causing the erosion rate to increase exponentially, which surpasses corrosion, making erosion as the dominant damage mechanism at high velocities. These results highlight the critical role of flow velocity in controlling the erosion-corrosion synergy behavior.

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Theoretical and experimental analyses of a novel recirculated regenerative rotary desiccant wheel dehumidification system 32

Theoretical and experimental analyses of a novel recirculate...

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32nd International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 201.

作者： Han, Xiaoqu Wu, Wenxiang Zhou, Zhijie Wang, Yu Chong, Daotong Yan, Junjie State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an China China Ship Development and Design Center Wuhan China

ISBN: (纸本)9788361506515

The high humidity environment in the submarine cabins results in high energy consumption of the air conditioning system. Moreover, the removal of the hydrogen contained in the air, which constitutes a threat to crew’s safety, generates a huge amount of heat. It is of particular significance to reduce the humidity of the air efficiently, through recovery of the waste heat in the dehydrogenation process. Therefore, a novel recirculated regenerative desiccant wheel dehumidification system is proposed in the present work for submarine air-conditioning. The dehumidification rate was optimized through an appropriate proportion between inlet and recirculating air flows. Theoretical modeling and experimental study were carried out to explore the optimal dehumidification performance at different working conditions. The influence of process air parameters (including temperature and humidity), regeneration air parameters (including bypass ratio and regeneration air temperature) and rotary desiccant wheel parameters (including rotation speed and air flow ratio) were analyzed. It was found that the dehumidification rate could be effectively improved compared to sea water direct cooling. It increased with increasing regeneration air temperature and temperature drop. There was an optimal bypass ratio for the system, around 55%-70%, to obtain the highest dehumidification rate. The ratio increased with the regeneration air temperature. There existed an optimal rotary speed (approx. 1. r·h-1. and optimal air flow ratio (approx. 70%). Overall, the feasibility of the proposed system was validated and the dehumidification characteristics at various working conditions were demonstrated to prompt its application. © ECOS 201. - Proceedings of the 32nd International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems. All rights reserved.

关键词： Air conditioning

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