检索结果-内蒙古大学图书馆

SSRN 2022年

作者： Cao, Wen Wang, Shaoqi Ma, Lujing Liu, Shi Jin, Hui Wei, Wenwen Guo, Liejin State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xianning West Road Xi’an710049 China Suzhou Academy of Xi’an Jiaotong University No.99 Ren’ai Road Jiangsu Suzhou215123 China

Phenol is a representative compound in coal industrial wastewater. Metal cations are the main harmful components in the wastewater of the electroplating and dyeing industries. Supercritical water gasification (SCWG) of phenol with metal cations could provide a promising way to degrade coal chemical wastewater and metal-containing wastewater simultaneously. In this study, SCWG of phenol with Mg2+, Mn2+, and Ni2+ was carried out to investigate the effect of metal cations on gasification results. Results showed that gaseous product was mainly composed of H2, CO, CH4 and CO2, and CO2 was the dominant one. Prolonging residence time and increasing the concentration of metal cations significantly increased the gas yield of CO2 and carbon gasification efficiency. Higher concentrations of metal cations facilitated methane-reforming reaction and water-gas shift reaction. Metal cations promoted the generation of 1-Ethoxybutane by the ring-breaking reaction and prevented the polymerization reaction. The order of catalytic effect was ranked as Ni2+>Mn2+>Mg2+. Mg2+, Mn2+ and Ni2+ were finally transformed into the corresponding metal hydroxides and metal oxides which could be recycled for reutilization. NiO could be reduced into metallic Ni, which consumed the H2 but effectively catalyzed SCWG of phenol. © 2022, The Authors. All rights reserved.

关键词： Phenols

Feasibility analysis of MA transmutation in radial fuel shuffling TWR

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Yuanzineng Kexue Jishu/Atomic Energy Science and Technology 2015年 49卷 58-62页

作者： Zheng, Mei-Yin Tian, Wen-Xi Chu, Xiao Zhang, Da-Lin Su, Guang-Hui Qiu, Sui-Zheng State Key Laboratory of Multiphase Flow in Power Engineering School of Nuclear Science and Technology Xi'an Jiaotong University Xi'an710049 China

TWR can make use of non-enriched fuel and obtain very high burnup without the need of fuel reprocessing. TWR is an effective way of fuel utilization besides the closed fuel cycle. In this paper, the feasibility of MA transmutation in a TWR was analyzed to further excavate the fuel utilization of this type of reactor. MA was homogeneously charged in the self-designed 1 250 MWt board type radial fuel shuffling sodium cooled TWR core, and the MA weight fraction is from 2.0% to 12.0%. A self-developed MCNP-ORIGEN coupled code was applied to perform burnup calculation. The results indicate that the transmutation amount increases linearly with the MA weight fraction, while the transmutation rate parabolically varies with the increase of the MA weight fraction. Neutronic safety parameters, such as the core effective multiplication factor, Doppler feedback coefficient, void worth coefficient and effective delayed neutron fraction, were compared under different MA weight fractions. The results indicate that the core effective multiplication factor and the void worth coefficient increase with the MA weight fraction, while the Doppler feedback coefficient and the effective delayed neutron fraction decrease with the increase of the MA weight fraction. © 2015, Atomic Energy Press. All right reserved.

关键词： Nuclear fuel reprocessing

High-Entropy (Cocrfemnni)3o4 Catalysts for Propane Catalytic Destruction: Effect of the Precipitation Agent

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SSRN 2023年

作者： Ma, Yue Zhang, Yun Jian, Yanfei Jiang, Zeyu Chai, Shouning Li, Lu Xia, Lianghui He, Chi State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi’an Jiaotong University Shaanxi Xi’an710049 China Department of Physics and Information Technology Baoji University of Arts and Sciences Shaanxi Baoji721016 China National Engineering Laboratory for VOCs Pollution Control Material & Technology University of Chinese Academy of Sciences Beijing101408 China

Efficient catalytic destruction of light alkane with ultra-stable and highly symmetric structure is still an intractable issue. High entropy oxides (HEOs) with high chemical disorder and lattice distortion and superior stability have shown great potential in heterogeneous thermocatalysis. Herein, spinel-type HEOs are synthesized via a scalable co-precipitation method with different precipitants (NaOH, Na2CO3, and NaHCO3) and firstly adopted in catalytic destruction of propane. Results demonstrate that the HEO-NaOH possesses the best activity, achieving 90% of propane conversion at 325 °C with an apparent activation energy of 56 kJ·mol-1. Compared with other two HEOs, HEO-NaOH system has larger quantities of surface oxygen vacancies and easily forming several reactive oxygen species (OOH-, O2-, and OH-, etc.), which significantly contribute to the catalytic performance. Moreover, the excellent water resistance of HEOs is verified due to their high conformational entropy and structural stability. Reaction mechanism reveals that OOH- and O2- are the key species in the oxidation of C3H8, which break C-H and C-C bonds in sequence, and are then converted to oxygenated compounds via oxygen oxidation before the final mineralization. The present work provides new insights into the fabrication of efficient catalysts for light alkane destruction as well as other thermocatalytic applications. © 2023, The Authors. All rights reserved.

关键词： Sodium hydroxide

Effects of A‐Site Replacement (Sm, Y, and Pr) on Catalytic Performances of Mullite Catalysts for No Oxidation

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SSRN 2022年

作者： Chen, Lei Zhang, Chen Wu, Tiantian Huang, Boqiang Zhang, Jinping Guan, Guowei Zhang, Zaoxiao Hou, Xiaoke Hu, Chao Lu, Qiang School of Chemical Engineering and Technology Xi'an Jiaotong University Xi'An710049 China School of Chemistry Xi'an Jiaotong University Xi'An710049 China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'An China National Engineering Research Center of New Energy Power Generation North China Electric Power University Beijing China

Mullite is one of the most promising NO-SCO catalyst alternatives to the commercial Pt/Al 2 O 3 , and deciphering its intrinsic properties that affecting the catalytic performance is a great challenge but critical to the development of mullite catalysts. Herein, a series of Mn-based mullite nanofibers with different A‐site cations are synthesized by electrospinning method and used for catalytic NO oxidation. Activity tests show that SmMn 2 O 5 exhibits a better NO conversion rate (77.8%) than these of PrMn 2 O 5 (63.3%) and YMn 2 O 5 (57.5%) under typical experimental conditions ( GHSV=120 000 h -1 , T =325 °C ). To investigate the factors influencing the catalytic activity, various techniques including XRD, N 2 adsorption, SEM, TEM, EDX, XPS, H 2 -TPR and O 2 -TPR are employed, and the results show that abundant surface adsorbed oxygen species and good reducibility contribute greatly to the catalytic performance of SmMn 2 O 5 . DFT calculations revealed that A-site cation played the decisive role in the Fermi level relative to the Mn 3d-band centre, thus affecting the adsorption and dissociation of O 2 molecule. The present synthetic strategy offers a new viable route for the large-scale preparation of metal oxide catalysts with remarkable NO oxidation performance for practical application. © 2022, The Authors. All rights reserved.

关键词： Positive ions

Experimental study on potassium catalyzed gasification of large particle size biomass with CO2

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Journal of the Energy Institute 2023年 111卷

作者： Huang, Xiaole Li, Yuhang Ren, Jiyun Yang, KaiXuan Li, Ruiyu Bai, Yang Deng, Lei Che, Defu State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi'an Jiaotong University Xi'an710049 China Xi'an Thermal Power Research Institue Co. Ltd. Xi'an710032 China Shanghai Power Equipment Research Institute Co. Ltd. Shanghai 200240 China Shunde Institue of Inspection Guangdong Institue of Special Equipment Inspection and Research Foshan528300 China

Candlenut wood with large particle size is selected to investigate the biomass gasification catalyzed by potassium. The sample pore structure, the spatial distribution of potassium, and the effects of potassium salt species on the biomass gasification with CO2 are examined. The results show that the large particle candlenut wood exhibits obvious spatial anisotropy and that the pore structure is mainly distributed along the axial direction. Large particle candlenut wood has a more uniform distribution of potassium salts along the axial direction. Part of the potassium salt releases outward during the gasification, which reduces the potassium salt content in the sample center. The average potassium contents of sample loaded with KCl and biochar of sample loaded with KCl are 9.273% and 7.745%, respectively. The synthesis of polycyclic aromatic hydrocarbons in tar could be inhibited by potassium, which could also catalyze the gasification and methane removal reactions of biochar and facilitate the formation of CO and H2. Compared to raw sample (28.99%), the syngas yields from the gasification of sample loaded with KCl, sample loaded with K2CO3, and sample loaded with K2SO4 are 40.22%, 52.16%, and 41.72%, separately. The catalysis of potassium is closely related to its occupation of the active sites on biochar. The chemical bonds formed by potassium and biochar are repeatedly broken and formed during the gasification, which promotes the decomposition of organic matter. Compared with KCl and K2SO4, K2CO3 has a better catalytic effect. © 2023 Energy Institute

关键词： Biomass

Hierarchical Heterojunctions of Metal Sulfide Nanosheets/ Metal Oxide Nanofibers for an Efficient Detection of Formaldehyde

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SSRN 2024年

作者： Zhu, Lei Zhang, Jiaxin Wang, Jianan Liu, Jianwei Wang, Ze Yan, Wei Xi’an Key Laboratory of Solid Waste Resource Regeneration and Recycling State Key Laboratory of Multiphase Flow Engineering School of Energy and Power Engineering Xi’an Jiaotong University Xi’an710049 China School of Physics and Electrical Engineering Weinan Normal University Chaoyang Street Weinan714099 China School of Chemistry and Chemical Engineering Xi’an University of Science & Technology Xi’an710054 China

The construction of transition metal dichalcogenides (TMDs) heterojunctions for high performance gas sensors has garnered significant attention due to their capacity to operate at low temperature. Herein, we realize two-dimensional (2D) WS2 nanosheets in situ grown on one-dimensional (1D) In2O3 nanofibers to form heterostructures for formaldehyde (HCHO) gas sensors. Capitalizing on the p-n heterojunctions formed between WS2 and In2O3, coupled with the high surface-to-volume ratio characteristic of 1D nanostructures, the WS2/In2O3 NFs sensor demonstrated a high gas response value of 12.6 toward 100 ppm HCHO at operating temperature of 140 ℃, two times greater than that of the pristine In2O3 sensor. Meanwhile, the sensor presents remarkable repeatability, rapid response/ recovery time, and good long-term stability. The superior sensing capabilities of WS2/In2O3 NFs heterojunction are attributed to the combined impact of the increased charge transfer and the presence of more sites for gas adsorption. The research endows a potent approach for fabricating TMDs heterojunctions to significantly improve the performance of gas sensors. © 2024, The Authors. All rights reserved.

关键词： Tungsten compounds

Performance Analysis of Sco2 Tube with High Non-Uniform Heat Flux: Thermal-Fluid-Structural Evaluation and Optimization

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SSRN 2023年

作者： Gao, Shuo Wang, Yanjuan Li, Yi Liu, Qibin Xu, Jinliang The Beijing Key Laboratory of Multiphase Flow and Heat Transfer North China Electric Power University Beijing102206 China Institute of Engineering Thermophysics Chinese Academy of Sciences Beijing100190 China University of Chinese Academy of Sciences Beijing100190 China

Supercritical carbon dioxide (sCO2) has been a promising alternative working medium in coal-fired power plants, high-temperature solar power systems, and fuel cells. In these cases, sCO2 is in a round tube under high temperature and pressure with high non-uniform heat flux (NUH). In this study, a novel structure tube is proposed to match high NUH with thermal resistance by changing tube eccentricity. A three-dimensional (3D) multiphysical coupling model was constructed to compare the novel structure with a conventional tube. The properties of fluid dynamics, thermal stress, and coupled heat transfer were analyzed. The key working parameters were discussed. The maximum temperature of the novel structure was reduced by 13–36 K, and the maximum thermal stress was reduced by approximately 25–33% under all the simulated working conditions when the eccentricity changed from 0 to 0.4. The proposed structure can reduce the maximum temperature and thermal stress effectively under high NUH. Consequently, a novel insight is presented for the design and optimization of sCO2 tube under high NUH. © 2023, The Authors. All rights reserved.

关键词： Heat transfer

Bactericidal Action of the Reactive Species Produced by Gas-Discharge Nonthermal Plasma at Low Pressure

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Bactericidal Action of the Reactive Species Produced by Gas-...

9th Asia-Pacific Conference on Plasma Science and Technology (APCPST) and 21st Symposium on Plasma Science for Materials (SPSM)第9届亚太等离子体科学与技术国际会议暨第21届等离子体材料科学研讨会

作者： H.X.Liu J.R.Chen J.L.Zhao Department of Environmental Science and Engineering Xi''an Jiaotong University Xi''an.710049.China State Key Laboratory of Multiphase Flow in Power Engineering Xi''an Jiaotong University Xi''an.710049.China Department of Environmental Science and Engineering Xi''an Jiaotong University Xi''an.710049.China

Numerical simulation of condensation of supercritical water gasification products in a supersonic nozzle

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International Journal of Fluid Engineering

International Journal of Fluid engineering 2024年第4期1卷 76-88页

作者： Hongtu Wu Miso Jurcevic Henrik Ström Muhammad Shahzad Khurram Hui Jin State Key Laboratory of Multiphase Flow in Power Engineering(SKLMF) Xi’an Jiaotong University28 Xianning West RoadXi’an 710049ShaanxiChina LTEF—Laboratory for Thermodynamics and Energy Efficiency Faculty of Electrical EngineeringMechanical Engineering and Naval Architecture(FESB)University of SplitRudjera Boskovica 3221000 SplitCroatia Chalmers University of Technology GöteborgSweden COMSATS LahorePakistan

The clean and efficient separation of supercritical water gasification products(SCWGP)has emerged as a significant challenge in supercritical water gasification *** paper proposes the use of a supersonic nozzle for the condensation and separation of H2and CO_(2)from SCWGP,leveraging the high-pressure characteristics of these *** establishing a flow model and a condensation model for the supersonic nozzle,the effects of inlet pressure and inlet temperature on the condensation process are *** analysis reveals that the latent heat released during condensation causes an abnormal distribution of pressure and temperature within the *** the inlet pressure of the nozzle is increased from 7.0 to 9.0 MPa,the liquid phase mass fraction at the outlet rises from 5.3×10^(-3)to ***,when the inlet temperature is lowered from 300.0 to 290.0 K,the liquid phase mass fraction at the outlet also rises from 5.3×10^(-3)to *** increase in inlet pressure leads to the condensation location shifting toward the throat by~8.5×10^(-3)m·MPa^(-1),while the impact of inlet temperature is approximately-2.3×10^(-3)m·K^(-1).The nucleation rate in the nozzle is always concentrated in a small region.

关键词： condensation separation outlet

Prediction of Pressure Drop in Heavy Oil-Water Ring Two-Phase flow Based on Modified Two-Fluid Model

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SSRN 2024年

作者： Fu, Jiqiang Du, Mingjun Jing, Jiaqiang Sun, Jie Liu, Huichao Chen, Yongjiu State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University Xi’an710049 China China Petroleum Engineering & Construction Corp North Company Heibei Renqiu062552 China School of Oil & Natural Gas Engineering Southwest Petroleum University Sichuan Chengdu610500 China

Accurate prediction of pressure drop of the heavy oil-water ring flow in pipeline is of great significance for establishing an optimal drag reduction model and ensuring safe production. The effects of different factors on the flow pattern and pressure drop of heavy oil-water annular two-phase flow were systematically analyzed, and a standard two-fluid pressure drop prediction model for annular flow was established. By modifying the shear stress equation of oil-water interface and introducing the wave-flow theory to modify the shear stress equation of water wall, a pressure drop prediction model for the generalized concentric water ring was obtained to calculate the periodic fluctuations of oil phase. Furthermore, by introducing the comprehensive Reynolds number expression of eccentric water ring, the pressure drop prediction model for the generalized eccentric water ring was obtained to calculate the periodic fluctuations of oil phase. The results show that the pressure drop prediction accuracy of the concentric water ring for ultra-heavy oil is improved by 80 % by using the modified pressure drop prediction model. The comprehensive Reynolds number expression of eccentric water ring can effectively reflect the influence of eccentric effect on shear stress of water wall and the calculation error is less than 20 % by predicting the pressure drop of the generalized eccentric water ring with different density differences. © 2024, The Authors. All rights reserved.

关键词： Two phase flow