检索结果-内蒙古大学图书馆

A feasible process for removal and utilization of CO2 in thermal power plants by MDEA plus DMSO scrubbing and Cu/TiO2 photocatalytic reduction

引用

APPLIED THERMAL engineering 2019年 153卷 369-378页

作者： Luo, Qinlan Cao, Yang Liu, Zhuhan Feng, Bin Zhou, Qulan Li, Na Xi An Jiao Tong Univ State Key Lab Multiphase Flow Power Engn Xian 710049 Shaanxi Peoples R China Beijing Zhongrui Elect Syst Engn Design Inst Co L Wuxi 214135 Jiangsu Peoples R China

A dynamic system for simultaneous removal of CO2/SO2/NOx and desorption of CO2 was developed using N-methyl diethanolamine and dimethyl sulfoxide (MDEA + DMSO) scrubbing. The equilibrium of the absorption-desorption system was achieved as the CO2 absorption rate was approximately equal to the CO2 desorption rate. Then the Cu/TiO2 catalysts under different calcination temperature or with different Cu weight percent were prepared using the modified sol-gel method. Their crystal structures, morphologies, and pore properties were characterized by powder X-ray diffraction, scanning electron microscope, and nitrogen adsorption. The 2 wt% Cu/TiO2 under the calcination temperature of 500 degrees C exhibits the highest activity for photoreduction of CO2 into CH3OH with the CH3OH yield of 12.35 mu mol/g/h at 363 K, owing to its smallest crystal size, highest BET surface area and lowest recombination of photogenerated electrons and holes. Meanwhile, a feasible process for the removal and photoreduction of CO2 in thermal power plants using MDEA + DMSO scrubbing and Cu/TiO2 photocatalytic reduction was proposed basing on experimental results. As most of the energy consumption is supplied by solar energy, the process is economical, energy-saving and environmentally friendly.

关键词： Simultaneous removal CO2 desorption CO2 photoreduction TiO2 CH3OH

来源：评论

学校读者我要写书评

暂无评论

On the role of liquid viscosity in affecting droplet spreading on a smooth solid surface

引用

INTERNATIONAL JOURNAL OF multiphase flow 2019年第0期117卷 53-63页

作者： Qin, Mengxiao Tang, Chenglong Tong, Shangqing Zhang, Peng Huang, Zuohua Xi An Jiao Tong Univ State Key Lab Multiphase Flow Power Engn Xian 710049 Shaanxi Peoples R China Hong Kong Polytech Univ Dept Mech Engn Hung Hom Kowloon Hong Kong Peoples R China

The role of liquid viscosity on droplet spreading behavior upon impacting on a smooth stainless steel surface has been experimentally investigated. Results show the droplet spreading dynamics with increasing viscosity (characterized by the Ohnesorge number, Oh) exhibits complex dependence on the impact inertia (characterized by Weber number, We). Specifically, for a small impact inertia (We<30), the droplet oscillates in the vertical direction around the maximum height Ha. The non-dimensional maximum diameter beta(max) first increases and then decreases with increasing Oh, and this non-monotonic phenomenon has not been reported previously. For an intermediate impact inertia (60240), droplet splashing emerges and then vanishes with increasing Oh, although beta(max) still decreases monotonically. All the observed phenomena imply that liquid viscosity may have a dual role in affecting the droplet spreading, which previous models of beta(max) do not take into account. (C) 2019 Elsevier Ltd. All rights reserved.

关键词： Droplet impact Maximum spreading diameter Non-monotonic dependence Viscosity effect

来源：评论

学校读者我要写书评

暂无评论

Feasibility Investigation for Online Elemental Monitoring of Iron and Steel Manufacturing Processes using Laser-Induced Breakdown Spectroscopy

引用

ISIJ INTERNATIONAL 2020年第5期60卷 971-978页

作者： Wang, Zhenzhen Deguchi, Yoshihiro Shiou, Fangjung Tanaka, Seiya Cui, Minchao Rong, Kai Yan, Junjie Xi An Jiao Tong Univ State Key Lab Multiphase Flow Power Engn 28 Xianning West Rd Xian 710049 Peoples R China Tokushima Univ Grad Sch Adv Technol & Sci 2-1 Minamijyosanjima Tokushima 7708506 Japan Natl Taiwan Univ Sci & Technol Dept Mech Engn 43Sec 4Keelung Rd Taipei 10607 Taiwan Northwestern Polytech Univ Key Lab High Performance Mfg Aero Engine MIIT Xian 710072 Peoples R China

The metallurgical industries are very important for social development. In order to improve the metallurgical techniques and quality of products, the real-time analysis and monitoring of iron and steel manufacturing processes are very significant. Laser-induced breakdown spectroscopy (LIBS) has been studied and applied for the contents measurement of iron and steel. In this paper, the remote open-path LIBS measurement was studied under different sample temperature, lens to target distance (LTD), sample angle conditions to clarify its online measurement features. The 3D profile measurement system of parallel laser beam fringes projection was also developed to measure the sample profile at different sample temperature. The measurement results demonstrated the robustness of remote open-path LIBS system and 3D profile measurement system. However, the correction is necessary to enhance the detection ability of LIBS online measurement. In order to improve the precision and accuracy of real-time elemental measurement, an innovative co-axial laser beam measurement system combining LIBS and 3D profile techniques is proposed to automatically adjust the focus unit and measure the sample components. The further study of this promising method will be developed for online application of iron and steel manufacturing processes.

关键词： laser-induced breakdown spectroscopy 3D profile remote measurement iron and steel manufacturing processes

来源：评论

学校读者我要写书评

暂无评论

Promoting nickel oxidation state transitions in single-layer NiFeB hydroxide nanosheets for efficient oxygen evolution

引用

NATURE COMMUNICATIONS 2022年第1期13卷 6094-6094页

作者： Bai, Yuke Wu, Yu Zhou, Xichen Ye, Yifan Nie, Kaiqi Wang, Jiaou Xie, Miao Zhang, Zhixue Liu, Zhaojun Cheng, Tao Gao, Chuanbo Xi An Jiao Tong Univ Frontier Inst Sci & Technol State Key Lab Multiphase Flow Power Engn Xian 710054 Shaanxi Peoples R China Soochow Univ Inst Funct Nano & Soft Mat FUNSOM Jiangsu Key Lab Carbon Based Funct Mat & Devices Joint Int Res Lab Carbon Based Funct Mat & Device Suzhou 215123 Jiangsu Peoples R China Univ Sci & Technol China Natl Synchrotron Radiat Lab Hefei 230029 Peoples R China Chinese Acad Sci Inst High Energy Phys Beijing 100049 Peoples R China

Promoting the formation of high-oxidation-state transition metal species in a hydroxide catalyst may improve its catalytic activity in the oxygen evolution reaction, which remains difficult to achieve with current synthetic strategies. Herein, we present a synthesis of single-layer NiFeB hydroxide nanosheets and demonstrate the efficacy of electron-deficient boron in promoting the formation of high-oxidation-state Ni for improved oxygen evolution activity. Raman spectroscopy, X-ray absorption spectroscopy, and electrochemical analyses show that incorporation of B into a NiFe hydroxide causes a cathodic shift of the Ni2+(OH)(2) -> Ni3+delta OOH transition potential. Density functional theory calculations suggest an elevated oxidation state for Ni and decreased energy barriers for the reaction with the NiFeB hydroxide catalyst. Consequently, a current density of 100 mA cm(-2) was achieved in 1 M KOH at an overpotential of 252 mV, placing it among the best Ni-based catalysts for this reaction. This work opens new opportunities in electronic engineering of metal hydroxides (or oxides) for efficient oxygen evolution in water-splitting applications.

关键词： Electrocatalysis Nanoparticles Electronic properties and materials

来源：评论

学校读者我要写书评

暂无评论

Minimum bubbling fluidization velocity in a supercritical water fluidized bed acquired by the dual-capacitance probe method

引用

CHEMICAL engineering SCIENCE 2019年 199卷 359-370页

作者： Huang, Jikai Lu, Youjun Wang, Hao Xi An Jiao Tong Univ State Key Lab Multiphase Flow Power Engn Xian 710049 Shaanxi Peoples R China Qilu Univ Technol Shandong Acad Sci Energy Res Inst Jinan 250014 Shandong Peoples R China

Supercritical water fluidized bed (SCWFB) is a newly developed reactor for coal and biomass gasification without releasing pollutants. The knowledge of two-phase flow properties in SCWFB is still lacked so far in literatures due to the extreme operating condition of high-pressure and high-temperature supercritical water. In this paper, a special dual-capacitance probe measurement system is developed for the extreme flow environment in SCWFB. It is found that the linear relationship is more precise in converting the capacitance of the probe sensor into local volume fraction of solids in SCWFB than Bottcher relationship. With the help of the newly-developed dual-capacitance probe measurement system, an experimental study on the bubbling fluidization in a SCWFB is carried out when the system pressure is in the range of 20-27 MPa and the system temperature is in the range of 410-570 degrees C. Four groups of quartz sands with different mean diameters which belong to Geldart type B classification are fluidized. It is found that the bed expansion method which was used in literatures to identify the onset of bubbling fluidization in supercritical carbon dioxide fluidized bed doesn't have enough precision in a SCWFB. To solve this problem, a new method of identifying the onset of bubbling fluidization in SCWFB is proposed. The minimum bubbling Reynolds number increases with the Archimedes number in a logarithmic relationship in SCWFB. At last, a new predicting correlation of the minimum bubbling fluidization velocity in SCWFB is proposed: Re-mb = 26.7091n(Ar + 10253.88) - 247.339, 1900 < Ar < 180000 The relative error of the new predicting correlation is within +/- 20% and the averaged relative error is 7.5%. The research work in this paper provides useful guidance for the optimization and operation of SCWFB reactor. (C) 2019 Elsevier Ltd. All rights reserved.

关键词： Supercritical water fluidized bed Minimum bubbling fluidization velocity Dual-capacitance probe method

来源：评论

学校读者我要写书评

暂无评论

Determination of thermal conductivity of interfacial layer in nanofluids by equilibrium molecular dynamics simulation

引用

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 2019年 128卷 199-207页

作者： Wang, Xin Jing, Dengwei Xi An Jiao Tong Univ State Key Lab Multiphase Flow Power Engn Xian 710049 Shaanxi Peoples R China Xi An Jiao Tong Univ Int Res Ctr Renewable Energy Xian 710049 Shaanxi Peoples R China

In this article, equilibrium molecular dynamics are performed to investigate the thickness and thermal conductivity of interfacial layer around the nanoparticle in dilute nanofluids. A nanofluids system of a 1-nm-diameter copper spherical nanoparticle immersing into argon base liquids and then a flat interface formed by liquid argon on the solid copper surface are studied. Green-Kubo formula is developed to calculate thermal conductivity of interfacial layer. Besides, the effect of solid-liquid interaction is studied. The nano-scale thin interfacial layer with more ordered structure and higher thermal conductivity than that of the base fluids is observed. Then the simulation results are incorporated into the modified Maxwell equation to calculate the effective thermal conductivity of nanofluids. The results indicate that the contribution of interfacial layer to thermal conductivity enhancement of nanofluids can be neglected. (C) 2018 Elsevier Ltd. All rights reserved.

关键词： Molecular dynamics simulation Thermal conductivity Interfacial layer Nanofluids Effective medium theory model

来源：评论

学校读者我要写书评

暂无评论

Electron transfer via homogeneous phosphorus bridges enabling boosted photocatalytic generation of H2 and H2O2 from pure water with stoichiometric ratio

引用

NANO ENERGY 2022年第PartA期103卷

作者： Xue, Fei Si, Yitao Cheng, Cheng Fu, Wenlong Chen, Xiangyan Shen, Shaohua Wang, Lianzhou Liu, Maochang Xi An Jiao Tong Univ Int Res Ctr Renewable Energy Xian 710049 Shaanxi Peoples R China Xi An Jiao Tong Univ State Key Lab Multiphase Flow Power Engn Xian 710049 Shaanxi Peoples R China Xi An Jiao Tong Univ Suzhou Acad Suzhou 215123 Jiangsu Peoples R China Univ Queensland Nanomat Ctr Sch Chem Engn Brisbane Qld 4072 Australia Univ Queensland Australian Inst Bioengn & Nanotechnol Brisbane Qld 4072 Australia

We report efficient and simultaneous production of H2 and H2O2 from photocatalytic pure water splitting over a novel heterojunction photocatalyst made of red phosphorus (RP) and CoxP co-modified P-doped g-C3N4 (PCN). The success relies on the formation of RP as an intermediate to link CoxP and PCN, introducing atomic-level homogeneous P-P/P-P bonds in the heterojunction. The crafted P-P/P-P bridges as unique channels enable controllable and smooth charge flow via strong electronic coupling between each component in the composite photocatalyst, endowing a boosted carrier kinetics. More significantly, RP also facilities a Z-scheme charge transfer that induces two-electron photocatalytic H2 and H2O2 production from pure water in 1:1 stoichiometry. The highest activity reaches 15.26 mu mol h-1 for bifunctional chemical evolution under simulated solar light irradiation, with the apparent quantum efficiencies (AQE) of 6.2 % at 366 nm and 3.6 % at 425 nm, without using any noble metals on 50 mg of photocatalyst. The new insights of phosphorus bridges can be applied to other composite photocatalysts for reinforced reaction kinetics towards value-added chemicals generation.

关键词： Photocatalysis Phosphorus bridge Pure water splitting Bifunctional H 2 and H 2 O 2 production Electron transfer

来源：评论

学校读者我要写书评

暂无评论

Three-dimensional modeling and thermal hydraulic analysis of high temperature gas-cooled reactor core 27

Three-dimensional modeling and thermal hydraulic analysis of...

引用

27th International Conference on Nuclear engineering: Nuclear power Saves the World!, ICONE 2019

作者： Zhang, Shuangbao Li, Liangxing Xie, Wei Wang, Kailin State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xianning West Road 28# Xi'an city710049 China

ISBN: (纸本)9784888983051

The high temperature gas-cooled reactor (HTR) is an advanced reactor with the characteristics of Generation IV nuclear energy system which has attracted wide attention due to the excellent performances of inherent safety, economy, high efficiency and low carbon environmental protection. Accurate and reliable thermal hydraulic analysis is of great significance for studying the flow and heat transfer in the core of HTR. Based on the coolant flow and heat transfer process in the core of HTR, this study establishes a three-dimensional coupled model by using CFD (Computational Fluid Dynamics) software firstly, and the flow and heat transfer process of helium coolant is simulate in the core. The temperature variation in the reactor is calculated under the conditions of steady-state operation of the HTR core, and the calculation results by the present models were compared with calculated results from the benchmark software of Thermix and the related published results. The results showed that the average temperature of the outlet section is 759.6 ℃, and the maximum relative error with the published data is 1.25%. The steady-state results under the full power conditions based on the three-dimensional model are in good agreement with the calculation data from those of THERMIX. It stated that the three-dimensional model can be employed to simulate the thermal hydraulic analysis for HTR. On this basis, the heat transfer characteristics of core is simulated under 50% full power, and the are result helpful for the operation and design of HTR. © 2018-2019 by JSME

关键词： Porous materials

来源：评论

学校读者我要写书评

暂无评论

Rapid Prediction Models for Oil Temperature and Surrounding Environment Temperature Fields in Buried Hot Crude Oil Pipelines

引用

Journal of Pipeline Systems engineering and Practice 2025年第3期16卷

作者： Yan, Feng Xu, Jingyan Li, Qifu Zhou, Chaoqun Ji, Mingyang Gong, Junhua Xiang, Yue Chen, Yujie Han, Dongxu Wang, Peng Dept. of Storage and Transportation Technology Research PipeChina Research Institute of Science and Technology 4 Dongting 1st Rd. Binhai New Area Tianjin300450 China Project Management Center of Production and Operation Dept Northeast Company of PipeChina Hunnan District Liaoning Province Shenyang110000 China Dept. of Production and Operation Changqing Oil and Gas Transportation Branch of Northwest Company of PipeChina Xingqing District Yinchuan Ningxia750004 China School of Mechanical Engineering Beijing Institute of Petrochemical Technology Beijing102617 China State Key Laboratory of Multiphase Flow in Power Engineering Xi'An Jiaotong Univ Xi'an710049 China Dept. of Digital Twin for Energy and Power Systems Sichuan Energy Internet Research Institute Tsinghua Univ Sichuan610213 China

Wax-rich or high-viscosity crude oil requires heating for long-distance transportation in buried pipelines. Monitoring the temperature distributions and variations of both oil and surrounding environment is crucial to ensuring safety and economic efficiency. This study proposes two models for rapidly predicting the steady-state oil temperature and surrounding environment temperature fields based on the Fourier neural operator (FNO) network and U-shaped network (UNet), respectively. These models leverage numerical results as training data, incorporating boundary conditions and environment grid coordinates at the pipeline cross section as inputs to predict the temperature distributions of both oil and the surrounding environment along the buried pipeline. With optimized hyperparameters, the models achieve accurate and efficient predictions. The FNO and UNet models had average RMS errors (RMSEs) in environment temperature field prediction of 2.68×10-3 and 5.49×10-3 at the pipeline cross section, respectively. For oil temperature predictions, the FNO model had an average relative error of 1.49×10-4, compared with 2.55×10-4 for the UNet model, with average absolute error values of 5.32×10-3 and 7.24×10-3, respectively. Moreover, both models exhibited strong generalization, with an average RMSE in the environment temperature field prediction of less than 3.5×10-2 and an average relative error in oil temperature predictions of less than 2.1×10-3 across different data sets. Comparatively, the FNO and UNet model had slightly higher prediction accuracy than the UNet model. In terms of computational efficiency for a 100-km pipeline, these models offer improvements of at least 116.25× over the numerical simulation method, with a maximum improvement of 1,775.03× as the number of simultaneously predicted pipeline cross sections increases. © 2025 American Society of Civil Engineers.

关键词： flowlines

来源：评论

学校读者我要写书评

暂无评论

Experimental investigation and prediction of the thermal conductivity of water-based oxide nanofluids with low volume fractions

引用

JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY 2019年第1期135卷 257-269页

作者： Jin, Jingyu Hatami, Mohammad Jing, Dengwei Xi An Jiao Tong Univ State Key Lab Multiphase Flow Power Engn Xian 710049 Shaanxi Peoples R China Xi An Jiao Tong Univ Int Res Ctr Renewable Energy Xian 710049 Shaanxi Peoples R China

Although there are already many models for prediction of the thermal conductivity of nanoparticle suspension, most of them only consider the cases for high nanoparticle volume fractions (often > 0.1%). Considering the cost of particle itself, pumping and transportation, dispersion stability, etc., low particle concentrations are obviously more preferred. The present study firstly experimentally investigated the thermal conductivity of some oxide colloid suspensions with low particle concentrations. It was found that the famous multi-sphere Brownian model (MSBM) showed a large deviation for thermal conductivity prediction when the particle concentrations are below 0.1%. By introducing an adjustable exponential constant, n, into the volume fraction item of MSBM, the predicted thermal conductivity can be in good agreement with experimental data for the particle volume fractions ranging from 0.001 to 10%. The dependency of n on the particle volume fraction and its possible physical significance were discussed in detail. It turns out that, when the volume fraction is larger than 1%, the modified model can be reduced to the original MSBM. The value of n approximately equals to 0.7 when the volume fractions of nanofluids are lower than 0.005%. Between these two volume fractions, n is found to follow a nearly linear relation with the logarithm of volume fraction. The validity of the modified MSBM model for practical supplication was further justified based on numerical method. The simulation results showed that our model has excellent agreement with Maxwell-Garnetts model in low volume fraction ranges due to the weak interaction between various nanoparticles in the system. Our study should be of value for numerical simulation and engineering design of nanofluids in the future.

关键词： Nanoparticle suspension Thermal conductivity Multi-sphere Brownian model Low volume fractions

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：