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8th International Conference on Smart and Sustainable Technologies, SpliTech 2023

作者： Wei, Yimeng Kuanibieke, Jiadela Jin, Hui Xi'an Jiaotong University State Key Laboratory of Multiphase Flow in Power Engineering China

ISBN: (纸本)9789532901283

The continuous growth of CO2 emissions is one of the global problems facing humanity, and how to convert and exploit the stock of CO2 has become an urgent issue. Biomass as an activity of CO2 thermal reduction medium has become the focus of human attention in general. Supercritical CO2 (SCCO2) has the advantages of near-liquid density and high solubility, which can further strengthen the reduction process (T≥31.26, P≥72.9 atm). This paper described a SCCO2 reduction method of guaiacol on an intermittent Kettle Reactor to investigate the effects of reaction temperature (400-700), residence time (5-20 min) and reactant concentration (4 wt%-16wt%) on the three-phase products. The experimental results indicated that the carbon gasification efficiency (CE) and hydrogen gasification efficiency (HE) were 43.7% and 56.7%, respectively, when the carbon dioxide consumption reached 16.15 mol/kg. As the temperature increased, the consumption of carbon dioxide increased and the concentration of reactants increased with opposite results. © 2023 University of Split, FESB.

关键词： Carbon dioxide

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Experimental study on the influence of the temperature and thermal Stress of water wall in different arrangements of burners

Experimental study on the influence of the temperature and t...

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International Conference on Power engineering 2021, ICOPE 2021

作者： Wei, Lin Zhou, Qulan Liu, Zhuhan Li, Na State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University China

To study the water walls' safety problems of the opposed firing boiler, thermal experiments for four typical arrangements of burners conditions are run in a laboratory-scale boiler. The four working conditions include 25% rated load (four burners are arranged side by side on the front wall), 50% rated load (eight burners are all arranged on the front wall;eight burners are arranged opposed to each other on the front and rear walls) and 100% load (front and rear walls are filled with sixteen burners). The principal strain, principal stress and temperature distribution of the water wall under four operating conditions are drawn for comparison and analysis. In addition, the results of the thermal stress, principal main stress direction and water wall temperature of the four working conditions are counted respectively to summarize the laws of them. This study highlights the influence of the temperature and thermal stress on water walls in different arrangements of burners to guide the safe operation of water walls in the real opposed firing boiler. © 2021 The Japan Society of Mechanical Engineers.

关键词： Thermal stress

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Prediction of von Mises stress on the membrane wall in a lab-scale arch-fired boiler based on artificial neural work

Prediction of von Mises stress on the membrane wall in a lab...

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International Conference on Power engineering 2021, ICOPE 2021

作者： Wen, Du Zhou, Qulan Pan, Yuqing Chen, Xiaole Li, Na State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University China

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CO₂-to-C₂H₅OH photoconversion by an amorphization-activated catalyst

Chem Catalysis

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Chem Catalysis 2025年第5期5卷

作者： Xue, Fei Zhang, Chunyang Liu, Maochang Liu, Feng Yan, Xueli Liu, Shangheng Peng, Huiping Hu, Zhiwei Pao, Chih-Wen Huang, Wei-Hsiang Yang, Ye Huang, Xiaoqing Xu, Yong i-lab of Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO) Chinese Academy of Sciences (CAS) Suzhou 215123 China State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 China International Research Center for Renewable Energy & State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China Max Planck Institute for Chemical Physics of Solids Nothnitzer Strasse 40 Dresden 01187 Germany National Synchrotron Radiation Research Center 101 Hsin-Ann Road Hsinchu 30076 Taiwan Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM) Xiamen 361005 China

CO2 photoconversion into value-added C2 products with high selectivity and efficiency is formidably challenging due to highly energetic and kinetic restriction of C–C coupling. Designing catalysts to overcome those b... 详细信息

CO₂ photoconversion into value-added C₂ products with high selectivity and efficiency is formidably challenging due to highly energetic and kinetic restriction of C–C coupling. Designing catalysts to overcome those barriers is therefore crucial. Here, for the first time, we demonstrate an amorphization strategy to boost photocatalytic CO₂ ethanolization. By integrating amorphous Pd onto Cd_0.9Zn_0.1S nanorods (a-Pd/CZS), an activity of 412.1 μmol g⁻¹ h⁻¹ and a selectivity of 96.5% for CO₂-to-C₂H₅OH photoconversion were achieved without a sacrificial agent with an apparent quantum efficiency (AQE) of 0.87% at 420 nm. The superior performance results from rapid migration of photogenerated electrons to amorphous Pd via interfacial Ohmic junction. In situ characterization and theoretical calculation further reveal that amorphous Pd can optimize CO₂ adsorption/activation and reduce the C–C coupling energy barrier via intensified interaction and stabilization with a ^∗OCCO intermediate, thereby maximizing conversion efficiency and selectivity. This work highlights an efficient photocatalyst for a CO₂-to-C₂ product and inspires high-performance photocatalyst design. © 2025 Elsevier Inc.

关键词： amorphization C2H5OH CO2 photocatalytic conversion SDG7: Affordable and clean energy

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Instantaneous liquid and gas leakage flow during plunger lifting process in vertical wells 11

Instantaneous liquid and gas leakage flow during plunger lif...

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11th North American Conference on multiphase Technology

作者： Zhao, K. Bai, B. State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University China

Plunger lift is an economical artificial lift method to solve the liquid loading problem in gas wells. Because of the inevitable annular gap between plunger and tube wall, the liquid above plunger may leak downward and the gas may slip upward during lifting process. How to quantitatively describe the gas-liquid counter-current flow sealing property is still challenging to optimize the plunger lift method. In this paper, the liquid leakage and gas slippage were observed experimentally. The transient physical models for gas and liquid leakage were proposed and verified. © 11th North American Conference on multiphase Technology. All rights reserved.

关键词： Liquids

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Edge detection based on wavelet analysis with Gaussian filter and application in multiphase flow

Edge detection based on wavelet analysis with Gaussian filte...

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2008 ASME Summer Heat Transfer Conference, HT 2008

作者： Chen, Bin Yang, Fude Guo Ning, Yahui Tao State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University China

ISBN: (纸本)9780791848487

In this paper an edge detection algorithm based on wavelet transform with Gaussian filter was proposed. In this algorithm original images are firstly converted into gray images and then each pixel was analyzed using wavelet transform to find the local maximum of the gray gradient of each pixel along the phase angle direction and compared with a given threshold value, through which real edge can be kept and fake ones will be eliminated. In the computation of local maximum, the gray gradients computed in eight directions, which can improve precision of edge detection. After the investigation of influence of filter length, scale and threshold value on the edge detection and validation by comparison with N.L. Fenandez-Garcia's Minimean and Minimax methods for 100 real color images, we applied this algorithm to bubbly gas-liquid two-phase flow. Compared with Canny operator, present result is more close to real bubble shape and can distinguish very close bubbles, which indicates the algorithm is effective and can be used to study the interaction between different phases and flow field in multiphase flow. Copyright © 2008 by ASME.

关键词： Edge detection

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Experimental Study on Deliquification with Atomizing Nozzle in Gas Well

Experimental Study on Deliquification with Atomizing Nozzle ...

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2020 International Conference on Green Energy, Environment and Sustainable Development, GEESD 2020

作者： Gao, Yutang Li, Xiaobai Chang, Peng Liu, Lei State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Shaanxi710049 China

Gas is a clean energy resource in comparison with oil and coal. Liquid-loading problem is frequently encountered in the process of gas production. It would directly cause the production of gas wells decreasing, even off production. A number of deliquification techniques have been suggested for solving this kind of problem, but the available techniques are not yet widely applicable. Based on the analysis, the method of deliquification with atomizing nozzle in gas wells was put forward. The test bench was designed for studying the atomization of nozzles and the liquid entrainment of gas flow. The size distribution of atomized droplets was measured by Malvern laser grain size analyzer. The Sauter mean diameters of atomized droplets were analysed under different two-phase flow conditions. The results indicate that the designed nozzles have good atomization performances and show potential application for reducing liquid loading in gas wells. © Published under licence by IOP Publishing Ltd.

关键词： Two phase flow

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Gas emission source term estimation with 1-step nonlinear partial swarm optimization-Tikhonov regularization hybrid method

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Chinese Journal of Chemical engineering 2018年第2期26卷 356-363页

作者： Denglong Ma Wei Tan Zaoxiao Zhang Jun Hu School of Food Equipment Engineering and Science Xi'an Jiaotong University State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University School of Chemical Engineering and Technology Xi'an Jiaotong University School of Chemical Engineering Northwest University

Source term identification is very important for the contaminant gas emission event. Thus, it is necessary to study the source parameter estimation method with high computation efficiency, high estimation accuracy and reasonable confidence interval. Tikhonov regularization method is a potential good tool to identify the source parameters. However, it is invalid for nonlinear inverse problem like gas emission process. 2-step nonlinear and linear PSO （partial swarm optimization）-Tikhonov regularization method proposed previously have estimated the emission source parameters successfully. But there are still some problems in computation efficiency and confidence interval. Hence, a new 1-step nonlinear method combined Tikhonov regularizafion and PSO algorithm with nonlinear forward dispersion model was proposed. First, the method was tested with simulation and experiment cases. The test results showed that 1-step nonlinear hybrid method is able to estimate multiple source parameters with reasonable confidence interval. Then, the estimation performances of different methods were compared with different cases. The estimation values with 1-step nonlinear method were close to that with 2-step nonlinear and linear PSO-Tikhonov regularization method, 1-step nonlinear method even performs better than other two methods in some cases, especially for source strength and downwind distance estimation. Compared with 2-step nonlinear method, 1-step method has higher computation efficiency. On the other hand, the confidence intervals with the method proposed in this paper seem more reasonable than that with other two methods. Finally, single PSO algorithm was compared with 1-step nonlinear PSO-Tikhonov hybrid regularization method. The results showed that the skill scores of 1-step nonlinear hybrid method to estimate source parameters were close to that of single PSO method and even better in some cases. One more important property of 1-step nonlinear PSO-Tikhonov regularization metho

关键词： Parameter estimation Parameter regularization method Source identification Inverse problem

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Experimental study on the CO-SCR performance of honeycomb-based Fe-Cu/RHA catalyst

Experimental study on the CO-SCR performance of honeycomb-ba...

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International Conference on Power engineering 2021, ICOPE 2021

作者： Pan, Yuqing Li, Na Wen, Du Ran, Shiyuan Wu, Chenyang Zhou, Qulan State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University China

The combustion process of carbon-based fuels will produce CO. If CO can be used as a reducing agent to remove NO, the goal of removing NO and unburned carbon (UBC) simultaneously can be achieved. When rice husk ash (RHA) rich in amorphous SiO2 is used to support Fe-Cu metal oxides, its huge specific surface area and non-lattice microstructure can reduce the reaction temperature, so that Fe-Cu/RHA catalyst has a high performance of selective catalytic reduction of NO by CO (CO-SCR). The paper used honeycomb ceramic to support Fe-Cu/RHA catalyst, and studied the effects of preparation method, active ingredient loading and reaction conditions on the CO-SCR performance of integral catalyst. The experimental results showed that the integral catalyst obtained by the heating and stirring method was better than the room temperature method. The conversion rates of CO and NO of the integral catalyst increased with the increase of the active ingredient loading. Besides, the oxygen concentration had little effect on the conversion rates of NO and CO. The conversion rate of CO to CO2 increased with the increase of temperature, and it could reach up to 98%. The conversion rate of NO to N2 fluctuated slightly as the temperature increased. © 2021 The Japan Society of Mechanical Engineers.

关键词： Selective catalytic reduction

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Study on the Optical Properties, Crystal Growth and Photocatalytic Activity of Ni-doped TiO2 Nanoparticles 18

Study on the Optical Properties, Crystal Growth and Photocat...

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18th World Hydrogen Energy Conference, WHEC 2010

作者： Guo, Penghui Guo, Liejin State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University China

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