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1.th 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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Experimental Investigation on Ejector Performance Using R1.4a as Refrigerant

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Journal of Thermal Science 2019年第4期28卷 727-735页

作者： DAI Zhengshu YU Bo LIU Pengpeng CHEN Guangming ZHANG Hua School of Energy and Power Engineering University of Shanghai for Science and TechnologyShanghai 200093China State Key Laboratory of Air-conditioning Equipment and System Energy Conservation Zhuhai 519070China Institute of Refrigeration and Cryogenics Zhejiang UniversityHangzhou 310027China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering Shanghai 200093China

Ejector refrigeration has the advantage of low capital cost,simple design,reliable operation,long lifespan and almost no *** only weakness is the low efficiency and its intolerance to deviations from design operation condition.R1.4 a used in ejector refrigeration system gives better performance in comparison with many other environmental friendly refrigerants as the generation temperature is from 75℃to 80℃.The present work experimentally investigated the on-design and off-design performance of the ejector with fixed geometry using R1.4 a as refrigerant,and cycle performance of the ejector refrigeration *** experimental prototype was constructed and the effects of primary flow inlet pressure,secondary flow inlet pressure and ejector back pressure on ejector performance and cycle performance were investigated *** operation conditions are:primary flow inlet pressure from 2.2 MPa to 3.25 MPa,secondary flow inlet pressure from 0.36 MPa to 0.51.MPa,ejector back pressure from 0.45 MPa to 0.67 *** were drawn from the experimental results,and the experimental data can be used for validation of theoretical model for both critical and subcritical mode.

关键词： ejector performance refrigeration R1.4a experiment

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Performance of different flocculants for harvesting Chlorella vulgaris by dissolved air flotation and sedimentation

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Bioresource Technology 2025年

作者： X. Wei N.R.H. Rao S. Tyagi W. Thielemans W. Cao L.J. Guo K. Muylaert State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an 710049 Shaanxi China Laboratory of Aquatic Biology KU Leuven Campus Kulak Kortrijk 8500 Kortrijk Belgium Sustainable Materials Laboratory Department of Chemical Engineering KU Leuven Campus Kulak Kortrijk 8500 Kortrijk Belgium

This study systematically evaluated the performance of dissolved air flotation and sedimentation for harvesting Chlorella vulgaris using eight different flocculants. Significant variation was observed in both the maximum harvesting efficiency and the minimum effective flocculant dose across different flocculant-process combinations. Among the tested flocculants, pyridinium modified cellulose nanocrystals achieved the highest harvesting efficiency of 99 % in both dissolved air flotation and sedimentation, while chitosan required the lowest minimum flocculant dose (∼2 mg·g −1.) to induce flocculation. The impact of floc size formed during the flocculation step on harvesting performance was also investigated, revealing that large flocs significantly favored sedimentation-based microalgae harvesting. A preliminary cost analysis highlighted the importance of integrating economic considerations into the selection of both flocculant and harvesting method. The findings suggest that optimal flocculant and process selection should be based not only on harvesting efficiency but also on cost-effectiveness for microalgal biomass recovery.

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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...

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201. 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. © 201. Materials Research Society.

关键词： Cadmium sulfide

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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 {1. 201., ICOPE 201.

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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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 1.60 nm ECDL, a 1.82 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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Performance of a domestic refrigerator using R600a/nano-TiO2 as working fluid

Performance of a domestic refrigerator using R600a/nano-TiO2...

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4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009

作者： Bi, Shengshan Guo, Kai Liu, Zhigang Wu, Jiangtao State Key Laboratory of Multiphase Flow in Power Engineering Xi'An Jiaotong University Xi'an Shaanxi 710049 China

ISBN: (纸本)9868509610

In this work, an experimental work was investigated on the nano-refrigerant. A domestic R600a refrigerator was selected and instrumented with 1. resistance thermometers and three pressure transducers. R600a/TiO 2 nano-refrigerants were used as working fluid without any system reconstruction. The refrigerator performance was then investigated using energy consumption test and freeze capacity test. The results indicate that R600a/TiO2 nano-refrigerant works normally and safely in the refrigerator. The refrigerator performance was better than the pure R600a system, with 9.6% less energy used with 0.5 g/L nano-refrigerant. Thus, using R600a/ TiO2 nano-refrigerant in domestic refrigerators is feasible.

关键词： Refrigerators

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A review on thermal application of metal foam

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Science China(Technological Sciences) 2020年第12期63卷 2469-2490页

作者： CHEN Kang GUO LieJin WANG Hui State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an 710049China Institute of Solar Engineering Technology Northwest Engineering Corporation LimitedPowerChinaXi’an 710065China School of Environmental Science and Engineering Donghua UniversityShanghai 201620China

Heat exchangers embedded with metal foam are drawing increasing attention in the thermal application field,due to the performance of low density,large ratio of surface area to volume as well as high thermal conductivity. In these applications,compact heat exchanger,solar thermal facilities and thermal energy storage are the three core components. This paper focuses on the lasted advances in thermal applications,presenting a review of theoretical and experimental progress over metal foam in thermal application. The empirical and theoretical models for pressure drop,heat transfer coefficient and performance evaluation criteria of compact heat exchangers with metal foam are reviewed and discussed,especially different optimized *** is a trade-off between heat transfer enhancement and increase of pressure drop. Some exploratory work performed by present authors are also introduced. The manufacturing,heat transfer and flow characteristics of tube bundle wrapped with metal foam are taken into account for optimization of heat exchanger. It is confirmed that the conversion mechanism of heat transfer is carried out that heat conduction is the dominative term at high dimension permeability. The correlations of heat transfer rate and pressure drop for staggered and single row tube bundle wrapped with metal foam are concluded,respectively. The effects of different bonding methods are revealed for point-contact in metal foam and base tube. The powder-sintering method can provide a stable and minimum-thickness bonding layer. Various types of solar thermal facilities utilized metal foam to improve the energy conversion efficiency from solar radiant energy to thermal energy are also reviewed and discussed,including solar collector for intermediate-low temperature utilization and solar receiver for high temperature utilization. The Last but not least,existing and future metal foam thermal application stations are overviewed.

关键词： metal foam heat transfer enhancement solar thermal facilities thermal energy storage

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Equations for the thermophysical properties of dimethyl carbonate

Equations for the thermophysical properties of dimethyl carb...

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2009 AIChE Annual Meeting, 09AIChE

作者： Zhou, Yong Wu, Jiangtao State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an Shaanxi 710049 China

Dimethyl carbonate (DMC) is a nonirritating and nontoxic chemical, further more;it can be used as a fuel additive. In this work, the thermophysical properties formulations for dimethyl carbonate has been developed based upon a selection of available experimental thermophysical property data. In determining the coefficients of the equation of state, multi-property fitting methods were used;including single-phase pressure-volume-temperature (pVT), heat capacity, vapor pressure, and saturated liquid density data. The equation of state has been developed to conform to the Maxwell criterion for two-phase liquid-vapor equilibrium states and is valid for temperatures from 280 K to 400 K and pressure to 60 MPa, and the extrapolation behavior of the equation of state at high temperatures and high pressures is reasonable. The deviation of the density (1.0x(ρcal-ρexp)/ρexp) is generally less than 0.1. and does not exceed 0.2% except for very few data points in liquid region. The uncertainty of the vapor pressure of the equation of state is generally less than 2.0%. The deviation of viscosity equation developed is generally less than 2.0%, and the absolute average deviation (AAD) between experimental and calculated values is 1.03%. In additional, the extended corresponding states (ECS) model with R1.4a as the reference fluid was used to represent viscosities and thermal conductivities, and the absolute average deviations are 1.34% and 1.47%, respectively. Detail comparisons between experimental and calculated data have been performed in the work.

关键词： Hydrostatic pressure

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Wall temperature calculation and safety analysis for the water wall of 660 MW ultra-supercritical circulating fluidized bed boiler 13

Wall temperature calculation and safety analysis for the wat...

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1.th International Conference on Fluidized Bed Technology, CFB 2021

作者： Yang, Dong Liang, Ziyu Dong, Le Zhou, Xihong Li, Juan State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Shaanxi Xi’an710049 China

ISBN: (纸本)9781771368506

Temperature safety analysis was conducted on the smooth tube of the supercritical circulating fluidized bed boiler through experiments, numerical simulation, and hydrodynamic calculation. The numerical simulation results of the inner wall temperature were compared with the results of the experiments and hydrodynamic calculation. Experimental results showed that heat transfer enhancement occurred near a pseudocritical point. Non-uniform circumferential heating weakened the buoyancy effect, which could effectively delay or prevent the occurrence of heat transfer deterioration, and the circumferential distribution of the wall temperature and heat flux was parabolic. The simulated results of the inner wall temperature were in satisfactory agreement with the experimental results. Furthermore, the inner wall temperature values of the hydrodynamic calculation were lower than the experimental values. These findings indicated that the temperature experimental results obtained by non-uniform circumferential heating were conservative. © 2021.CFB 2021.- Proceedings of the 1.th International Conference on Fluidized Bed Technology. All rights reserved.

关键词： Heat flux

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