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Photocatalytic degradation of waste liquid from biomass gasification in supercritical water with simultaneous hydrogen production over CdS sensitized Na2Ti2O4(OH)2

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Nanostructured Materials and Nanotechnology V - 36th International Conference on Advanced Ceramics and Composites, ICACC 2012

作者： Tang, Wendong Jing, Dengwei Guo, Simao Yin, Jiarong Guo, Liejin State Key Laboratory of Multiphase Flow in Power Engineering Xi'An Jiaotong University Xi'an ShaanXi 710049 China

ISBN: (纸本)9781118205976

Photocatalytic water splitting by solar light and biomass gasification in supercritical water both are considered as the most promising routes for renewable hydrogen production. The waste liquid from biomass gasification in supercritical water contains various organic compounds which can act as electron donors in photocatalytic system. In the present work, we report the hydrogen production by the anaerobic photocatalytic reforming of waste liquid from biomass gasification in supercritical water over CdS sensitized Na 2Ti2O4 (OH)2 nanotubes, Various reaction parameters were investigated, such as different gasification temperature and the pH value of the reaction solution. It was demonstrated that gasification in supercritical water and photocatalytic water splitting can be coupled together.

关键词： Cadmium sulfide

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An Experimental Study on the flow Characteristics of OilWater Two-Phase flow in Horizontal Straight Pipes

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Chinese Journal of Chemical engineering 2003年第5期11卷 491-496页

作者：刘文红郭烈锦吴铁军张西民 State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

The flow patterns and their transitions of oil-water two-phase flow in horizontal pipes were studied. The experiments were conducted in two kinds of horizontal tubes, made of plexiglas pipe and stainless steel pipe with 40 mm ID respectively. No. 46 mechanical oil and tap water were used as working fluids. The superflcial velocity ranges of oil and water were: 0.04-1.2m·s-1 and 0.04-2.2m·s-1, respectively. The flow patterns were identified by visualization and by transient fluctuation signals of differential pressure drop. The flow patterns were defined according to the relative distribution of oil and water phases in the pipes. flow pattern maps were obtained for both pipelines. In addition, semi-theoretical transition criteria for the flow patterns were proposed, and the proposed transitional criteria are in reasonable agreement with available data in liquid-liquid systems.

关键词： oil-water two-phase flow horizontal pipe flow pattern transition criterion

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Reversible V4+/V5+ Redox in Na4vfe(Po4)3 Cathode for High-power Sodium-Ion Batteries

SSRN

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SSRN 2025年

作者： Xie, Peng-Xing Zhao, Qing-Yuan Dong, Haojie Long, Tao Ding, Meng-Sha Xie, Bin Wang, Xiaofeng Ling, Wei Liu, Mengting Wu, Xiongwei Wang, Peng-Fei Zeng, Xianxiang School of Chemistry and Materials Science Hunan Agricultural University Changsha410128 China Center of Nanomaterials for Renewable Energy State Key Laboratory of Electrical Insulation and Power Equipment School of Electrical Engineering Xi'an Jiaotong University Shaanxi Xi’an710049 China Key Laboratory of Physics and Technology for Advanced Batteries Ministry of Education College of Physics Electron Microscopy Center Jilin University Changchun130012 China Hunan Engineering Technology Research Center of Vanadium Flow Battery and Energy Storage System Hunan Changsha410036 China College of Chemistry and Chemical Engineering Hunan Normal University Hunan Changsha410081 China

Delivery of high energy density in polyanion compound-Na3V2(PO4)3 based on three-electron redox is still challenging because of their controversial multi-electron reaction mechanism and unsatisfactory electrochemical reversibility. Herein, the reversible V4+/V5+ redox (ca. 4.0 V) could be successfully activated in Na4VFe(PO4)3 cathode material through a Na-rich strategy, demonstrating a reversible specific capacity of 154.7 mAh g−1 at 0.1 C and 90.3 mAh g−1 after 800 cycles at 20 C, with 80% of the initial capacity retained. The entire electrochemical reaction undergoes a highly recoverable phase transition by in-situ X-ray diffraction. Impressively, the Na-rich strategy could not only allow Na2 site to be occupied to activate the V4+/V5+ redox pair confirmed by X-ray absorption near-edge structure spectroscopy, but also enable Na+ transportation across the generated vacancies rather than synergistic Na+ diffusion. Therefore, Na4VFe(PO4)3||hard carbon full batteries deliver a high specific capacity of 104.5 mAh g−1 and 90 mAh g−1 at 0.2 C and 5 C, respectively. This work provides rational design strategy of multi-electron transfer reaction in high-energy sodium-ion batteries. © 2025, The Authors. All rights reserved.

关键词： Sodium-ion batteries

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Experimental and kinetic study of auto-ignition in diluted methane-hydrogen fuel blends at elevated pressures

Experimental and kinetic study of auto-ignition in diluted m...

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9th Asia-Pacific Conference on Combustion, ASPACC 2013

作者： Zhang, Yingjia Jiang, Xue Zhang, Jiaxiang Wei, Liangjie Man, Xingjia Huang, Zuohua State Key Laboratory of Multiphase Flow in Power Engineering Xianning West Road Xi'an Shaanxi 710049 China

Ignition delay times were obtained behind the reflected shock waves for the diluted stoichiometric methane/hydrogen blends with hydrogen fractions of 20%, 60%, and 80%. Test temperatures from 980 K to 1820 K and pressures from 0.5 to 2.0 MPa. Results show that increase in hydrogen fraction significantly promotes the ignition of fuel blends due to high activity of hydrogen. Pressure-dependence of auto-ignition for methane/hydrogen was observed in three ignition regimes (methane chemistry dominating ignition, combined chemistry of methane and hydrogen dominating ignition and hydrogen chemistry dominating ignition). An explanation of the interaction between chemistries of methane and hydrogen were given by fuel flux analysis using NUIG Mech C5-49.

关键词： Hydrogen

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Operando modeling and measurements:powerful tools for revealing the mechanism of alkali carbonate-based sorbents for CO_(2)capture in real conditions

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Frontiers in Energy 2023年第3期17卷 380-389页

作者： Tianyi CAI Mengshi WANG Xiaoping CHEN Ye WU Jiliang MA Wu ZHOU School of Energy and Power Engineering Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power EngineeringUniversity of Shanghai for Science and TechnologyShanghai 200093China Key Laboratory of Energy Thermal Conversion and Control of the Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 210096China Key Laboratory of Thermal Control of Electronic Equipment and Advanced Combustion Laboratory of the Ministry of Industry and Information Technology School of Energy and Power EngineeringNanjing University of Science and TechnologyNanjing 210094China

Alkalicarbonate-based sorbents(ACSs),including Na_(2)CO_(3)-and K2CO_(3)-based sorbents,are promising for CO_(2)***,the complex sorbent components and operation conditions lead to the versatile kinetics of CO_(2)sorption on these *** paper proposed that operando modeling and measurements are powerful tools to understand the mechanism of sorbents in real operating conditions,facilitating the sorbent development,reactor design,and operation parameter *** reviewed the theoretical simulation achievements during the development of *** elucidated the findings obtained by utilizing density functional theory(DFT)calculations,ab initio molecular dynamics(AIMD)simulations,and classical molecular dynamics(CMD)simulations as *** hygroscopicity of sorbent and the humidity of gas flow are crucial to shifting the carbonation reaction from the gas-solid mode to the gas-liquid mode,boosting the ***,it briefly introduced a machine learning(ML)approach as a promising method to aid sorbent ***,it demonstrated a conceptual compact operando measurement system in order to understand the behavior of ACSs in the real operation *** proposed measurement system includes a micro fluidizedbed(MFB)reactor for kinetic analysis,a multi-camera sub-system for 3D particle movement tracking,and a combined Raman and IR sub-system for solid/gas components and temperature *** is believed that this system is useful to evaluate the real-time sorbent performance,validating the theoretical prediction and promoting the industrial scale-up of ACSs for CO_(2)capture.

关键词： CO_(2)capture carbonation theoretical modeling operando techniques reaction visualization

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WS2 sensitized mesoporous TiO2 for efficient photocatalytic hydrogen production from water under visible light

WS2 sensitized mesoporous TiO2 for efficient photocatalytic ...

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16th World Hydrogen Energy Conference 2006, WHEC 2006

作者： Jing, Dengwei Guo, Lie-Jin Xing, Chanjuan Yan, Qiuhui State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an Shaanxi 710049 China

ISBN: (纸本)9781622765409

Nanosize WS2 sensitized mesoporous TiO2 was prepared to extend the adsorption of the wide band gap TiO2 into visible light region. Compared with nonporous particle TiO2 substrate, it was found that the existence of mesopore is important for larger amount of WS 2 loading and inhibition of the light-induced detachment of WS 2 particles from the TiO2 substrate during photocatalytic reaction, which leads to higher photocatalytic activity and stability. We also found that the rate-determining step for photocatalytic hydrogen production is the transfer of electrons from TiO2 substrate to H+ in solution, when the recombination between electrons and holes within TiO 2 could be neglected. In this case, deposition of Pt at the surface of semiconductor is indispensable for efficient hydrogen production.

关键词： Titanium dioxide

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Photocatalytic reforming of formic acid with simultaneous hydrogen production under visible light over CdS sensitized Na2Ti 2O4(OH)2

Photocatalytic reforming of formic acid with simultaneous hy...

引用

2011 MRS Spring Meeting

作者： Tang, Wendong Jing, Dengwei Guo, Liejin State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an Shaanxi 710049 China

ISBN: (纸本)9781618395238

The present work reports the renewable hydrogen production by an anaerobic photocatalytic reforming of formic acid over CdS sensitized Na 2Ti2O4(OH)2 nanotubes, the Na 2Ti2O4(OH)2 nanotube was prepared and charactered by X-ray diffraction, UV-visible absorption, transmission electron microscopy, etc. The activity of the catalyst in formic acid was investigated. The greatest photocatalytic reforming activity of formic acid occurs as the formic acid initial concentration is 20 v.%. A probable mechanism for the photocatalytic reforming process was proposed and discussed. © 2011 Materials Research Society.

关键词： Cadmium sulfide

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3 μm Hydrocarbon Gas Absorption Detection Based on DFG-TDLAS

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Guangxue Xuebao/Acta Optica Sinica 2025年第8期45卷

作者： Zhou, Wangzheng Qi, Chao Qin, Xiaowei Wang, Zhenzhen Yoshihiro, Deguchi Chong, Daotong Yan, Junjie State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Shaanxi Xi’an710049 China Graduate School of Technology Industrial and Social Sciences Tokushima University Tokushima770-8506 Japan Xi’an Aerospace Propulsion Institute Shaanxi Xi’an710100 China

Objective To achieve in-situ online detection of hydrocarbon gases at various temperatures, we explore the use of tunable diode laser absorption spectroscopy (TDLAS) for measuring hydrocarbon gas content. A difference frequency generation (DFG) laser, with a scanning range of 3250-3400 nm, is used to construct a hydrocarbon gas detection system. The 3 μm wide-band scanning provides a significant number of characteristic absorption peaks and reveals the absorbance line shapes of the absorption band. This makes hyperspectral fitting feasible and enhances the system’s versatility. Methods First, the DFG-TDLAS system and hydrocarbon gas detection experimental setup are established. The DFG-TDLAS system includes a 1060 nm ECDL, a 1582 nm DFB laser, a WDM fiber coupler, and a PPLN module. This system can achieve 3250-3400 nm laser output with a resolution of 0.01 cm-1. The hydrocarbon gas detection experimental system includes a high-temperature absorption chamber and a heating chamber. The absorbed laser signal is collected from the high-temperature chamber. Samples are heated in the chamber, and the gas produced during the decomposition process is collected. Second, the DFG-TDLAS output laser is employed to measure the absorption spectra of seven hydrocarbon molecules, including C1-C4 hydrocarbons and benzene. Standard hydrocarbon gases are measured at different temperatures and volume fractions to establish the absorption spectra database. The coal is heated to 623 K in the heating chamber, and the resulting gases from thermal decomposition are measured in the high-temperature chamber. The DFG-TDLAS system and hydrocarbon absorption spectra databases are used for qualitative analysis. Results and Discussions During the detection of standard hydrocarbon gases, the pressure in the high-temperature absorption chamber is maintained at 0.1 MPa, and the detection temperatures are 298, 423, 523, 623, and 723 K (Fig. 3). Hydrocarbon gas absorption is also measured at different

关键词： Absorption spectroscopy

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Simulation study on boiler thermal system of a 600MW supercritical lignite-fired power plant based on GSE

Simulation study on boiler thermal system of a 600MW supercr...

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International Conference on power engineering 2013, ICOPE 2013

作者： Han, Xiaoqu Ma, Huajie Xue, Zhaonan Yan, Junjie Chong, Daotong Wang, Jinshi State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jia Otong University Xi'an710049 China

In this paper, the boiler thermal system of a 600MW supercritical lignite-fired power plant was modeled and simulated with the application of GSE simulation software. The model was developed in Jtopmeret according to the structural features and divided into steam-water system, flue gas -air system, and direct-fired pulverizing system. Model simulations were implemented in SimExec. The outlet temperature of different devices and sections under BMCR and 75% THA conditions were compared with the reference data. The results show that the simulation model developed had high accuracy and reliability. Further simulations were carried out on the varied load. The boiler efficiency and flue gas extraction amount changed with the load.

关键词： Flue gases

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Study on startup characteristics of prototype once-through steam generator for China fast reactor

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International Journal of Advanced Nuclear Reactor Design and Technology 2022年第1期4卷 26-35页

作者： Min, Xin Zhang, Dalin Xu, Rongshuan Wang, Shibao Chen, Youchun Wang, Chenglong Tian, Wenxi Qiu, Suizheng Su, G.H. State Key Laboratory of Multiphase Flow in Power Engineering Shaanxi Key Lab. of Advanced Nuclear Energy and Technology School of Nuclear Science and Technology Xi'an Jiaotong University Xi'an710049 China

Once-through steam generator (OTSG) is a vital heat transfer equipment of China Fast Reactor-600 (CFR-600), and its startup characteristics are of great importance to the safe operation of nuclear power plant. In this paper, first of all, the Thermal-hydraulic analysis Code Of Sodium heated once-through Steam generator (TCOSS) has been further optimized, and the code was introduced in the text. Secondly, the Steam Generator Test Facility (SGTF) and India Commercial Fast Breeder Reactor (CFBR) were selected for steady-state verification, and the feedwater flow rate increase condition of the prototype OTSG experiment was selected for transient verification. All the verifications were in good compliance, which proved the reliability of the TCOSS code for subsequent calculation of startup conditions. Finally, taking the prototype OTSG of CFR-600 as the research object, and the transient characteristics of cold startup and hot startup have been predicted and analyzed. The results show that both processes of cold startup and hot startup for prototype OTSG can be realized stably. The simulation results of startup processes showed a good agreement with expectations, which can provide support for the development of CFR-600 steam generator. © 2022 Xi'an Jiaotong University

关键词： Steam generators

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