检索结果-内蒙古大学图书馆

Influence of CS₂ pretreatment on the NH₃-SCR activity of CeO₂: Synergistic promotional effect of sulfation and reduction

引用

JOURNAL OF ENVIRONMENTAL CHEMICAL engineering 2021年第6期9卷

作者： Wang, Wei Xiong, Zhibo Jin, Jing Lu, Wei Shi, Huancong Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai 200093 Peoples R China Univ Shanghai Sci & Technol Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai 200093 Peoples R China Zhejiang Univ Huzhou Inst Huzhou 313000 Zhejiang Peoples R China Univ Regina Clean Energy Technol Res & Innovat Ctr Regina SK S4S 0A2 Canada

Due to the promotional effect on the surface acidity, SO2 had been usually used to improve the selective catalytic reduction of NOx with NH3 (NH3-SCR) over cerium oxide/cerium-based catalyst via gas phase sulfation. However, CS2 and COS, largely existing in the coke oven or/and gasification flue gas, exhibit stronger reducibility and present the unique physicochemical properties in acidity and reduction property compared to SO2. To the best of my knowledge, the reductive CS2 and COS had not been used to increase the NH3-SCR activity of cerium oxide/cerium-based catalyst. Therefore, the influence of CS2 and COS gas phase sulfation pretreatment on the NH3-SCR performance of CeO2(w/o) had been investigated with SO2 as comparison herein. The results indicate that the promotional effect of the sulfur-containing species pretreatment on the NH3-SCR performance over CeO2(w/o) decrease as following: CS2>COS>SO2, which is in accordance with the intensity of their reducibility. Compared with SO2, the pretreatment with CS2 could induce more Ce4+ to reduce to Ce3+ and generate more surface defects due to its stronger reducibility, leading to more oxygen defects and chemisorbed oxygen formed on the surface of CeO2(w/o). And the sulfation treatment could slightly decrease the crystallinity of cubic CeO2. The characterization results also confirm that the pretreatment with CS2 contributes to the formation of more sulfate species, not only enhances the abundance and strength of Bronsted acid sites on the CeO2(w/o) surface, but also helps to the generation of low-temperature Lewis acid sites compared to SO2. All these should be the crucial reasons for the best de-nitration activity over CeO2-CS2-3 in the operating temperature range. We expected that this research could provide a new strategy for designing novel CeO2-based NH3-SCR catalyst.

关键词： NH3-SCR CeO2 Gas phase sulfation CS2 Pretreatment Reducibility

来源：评论

学校读者我要写书评

暂无评论

Numerical investigation of heterogeneous nucleation of water vapour on PM10 for particulate abatement

引用

CANADIAN JOURNAL OF CHEMICAL engineering 2019年第4期97卷 930-939页

作者： Fan, Fengxian Zhang, Sihong Peng, Zhengbiao Chen, Jun Su, Mingxu Moghtaderi, Behdad Doroodchi, Elham Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai 200093 Peoples R China Univ Shanghai Sci & Technol Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai 200093 Peoples R China Univ Newcastle Sch Engn Discipline Chem Engn Callaghan NSW 2308 Australia

A heterogeneous nucleation model with inclusions of the line tension effect, the particle roughness effect, and the surface diffusion mechanism was presented. Effects of the particle roughness and the wetting agent on the heterogeneous nucleation behaviour were examined. The scaled nucleation barrier was analyzed and subsequently implications of the nucleation behaviour in the particulate abatement by vapour condensation were discussed. It was found that the effect of particle roughness on the nucleation behaviour was greatly affected by the line tension. There existed an optimal concentration of wetting agent at which the lowest nucleation barrier and critical saturation ratio could be obtained. The surface diffusion mechanism played an overwhelmingly important role in governing the embryo growth for hydrophilic particles with a diameter D-p > 0.1 mu m and an embryo size smaller than the critical size, otherwise the contribution of direct vapour deposition mechanism could be significant. Based on the scaled nucleation barrier, three distinct nucleation regimes, i.e. athermal heterogeneous nucleation, thermal heterogeneous-dominant nucleation, and homogeneous-dominant nucleation, have been identified. When the contact angle was large, the wetting agent might need to be added to reduce the contact angle so as to reach the athermal heterogeneous and thermal heterogeneous-dominant nucleation regimes, thus achieving efficient particulate abatement at low cost. The prediction results matched reasonably with the experimental data.

关键词： heterogeneous nucleation PM10 vapour condensation particulate abatement numerical simulation

来源：评论

学校读者我要写书评

暂无评论

Techno-economic evaluation of the novel hot air recirculation process for exhaust heat recovery from a 600 MW hard-coal-fired boiler

引用

ENERGY 2020年 200卷

作者： Ma, Youfu Wang, Ziwen Lyu, Junfu Wang, Zirui Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai 200093 Peoples R China Tsinghua Univ Dept Energy & Power Engn Key Lab Thermal Sci & Power Engn Minist Educ Beijing 100084 Peoples R China

To increase the efficiency of thermal power plants, we have recently proposed and analyzed a novel exhaust heat recovery process called hot air recirculation (HAR), applied to a brown-coal-fired power unit as a test case. However, the performance of HAR, applied to a hard coal-fired power unit, is not clearly understood yet. In this study, the HAR process was redesigned to match the actual supply air and flue gas layout of a hard-coal-fired boiler. The thermo- and techno-economic performances of HAR, as well as the conventional bypass flue (CBF) process, applied to a 600 MW hard-coal-fired power unit, were analyzed in detail. The results indicate that, when the boiler exhaust heat is recovered from 122 to 90 degrees C, the net coal savings, initial capital cost, and payoff period of HAR are 3.49 g/(kW.h), $1.473 million, and 1.34 years, respectively, whereas those of CBF are 2.98 g/(kW.h), $2.528 million, and 3.04 years, respectively. Therefore, it is established that HAR can benefit a hard-coal-fired power plant with a greater saving on coal consumption and a more economical project investment, in addition to providing a safe and reliable operation, as compared to similar processes. (C) 2020 Elsevier Ltd. All rights reserved.

关键词： Thermal power plant Utility boiler Waste heat recovery Hard coal Hot air recirculation

来源：评论

学校读者我要写书评

暂无评论

Wet gas pressure drop across orifice plate in horizontal pipes in the region of flow pattern transition

引用

flow MEASUREMENT AND INSTRUMENTATION 2020年 71卷

作者： Liu, Weiye Ma, Youfu Lyu, Junfu Shao, Jie Wang, Shuo Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai 200093 Peoples R China Tsinghua Univ Dept Energy & Power Engn Key Lab Thermal Sci & Power Engn Minist Educ Beijing 100084 Peoples R China

As a basis for measuring the mass flow rate of wet gas using differential pressure meters, predicting the pressure drop of a wet gas flowing through orifice plates is important;however, this has not yet been solved satisfactorily, although many studies have reported on that subject. In this study, the pressure drop of wet gas across sharp-edged orifice plates was experimentally investigated in the region of flow pattern transition using air and water as the two phases, and the prediction performance of the available pressure drop models was compared based on the experimental data. The results show that the homogenous flow models overestimate the pressure drop, whereas those models based on the separated flow model often present underestimations. The models reported for wet gas are also incapable of predicting the pressure drop in this region with acceptable accuracy. Through an analysis of the prediction deviations, it is found that the Froude number of the liquid phase has a significant influence on the pressure drop of the wet gas, besides the Froude number of the gas phase. Then, three new correlations that are based on the homogeneous flow, Chisholm model, and Murdock model, respectively, were proposed based on the experimental result.

关键词： Gas-liquid flow Wet gas Orifice plate Pressure drop Prediction model

来源：评论

学校读者我要写书评

暂无评论

Aeroelastic Analysis of Preset Angle for A Typical Airfoil Section with Cubic Nonlinear Stiffness 3

Aeroelastic Analysis of Preset Angle for A Typical Airfoil S...

引用

3rd International Conference on Fluid Mechanics and Industrial Applications (FMIA)

作者： Nan, Guofang Ding, Di Wang, Weitao Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai Peoples R China Shanghai Key Lab Multiphase Flow & Heat Transfer 516 Jungong Rd Shanghai 200093 Peoples R China

The influences of the preset angle on the dynamic responses of the typical airfoil section with cubic nonlinear stiffness were investigated under consideration of the aerodynamic flutter onset due to certain angle of attack. The typical airfoil model with cubic nonlinear stiffness is developed to analyze the plunging and the pitching motions for the airfoil section. Based on the Grossman's quasi steady aerodynamic model, the aerodynamic lift and the moment can be obtained and then the equation of motion for the airfoil section is derived by applying the Lagrange theorem. The effects of the preset angle and the oncoming flow speed on the nonlinear dynamics are analyzed by means of the bifurcation diagram, the frequency-amplitude diagram, the time history, etc. Simulation results show that the preset angle influences the intensity of the vibration, moderate or severe, stable or unstable, even under certain circumstance, the jump and chaos phenomenon occur;and the oncoming flow speed affects the distribution of the vibration energy for the plunging and the pitching motions. The unstable stall region for the responding parameters should be avoided to keep the airfoil safe in engineering practice. Some qualitative and quantitative rules are obtained for the airfoil design and the flutter suppression.

关键词： Aeroelastic Preset Angle Airfoil Cubic Nonlinear Stiffness Vibration

来源：评论

学校读者我要写书评

暂无评论

Robust DNA-Bridged Memristor for Textile Chips

引用

Angewandte Chemie 2020年第31期132卷 12862-12868页

作者： Xu X. Zhou X. Wang T. Shi X. Liu Y. Zuo Y. Xu L. Wang M. Hu X. Yang X. Chen J. Chen L. Chen P. Peng H. State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science and Laboratory of Advanced Materials Fudan University Shanghai 200438 China State Key Laboratory of ASIC and System School of Microelectronics Fudan University Shanghai 200433 China International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiao Tong University Shannxi 710049 China State Key Laboratory of Surface Physics Fudan University Shanghai 200438 China Department of Materials Science Fudan University Shanghai 200438 China

Electronic textiles may revolutionize many fields, such as communication, health care and artificial intelligence. To date, unfortunately, computing with them is not yet possible. Memristors are compatible with the interwoven structure and manufacturing process in textiles because of its two-terminal crossbar configuration. However, it remains a challenge to realize textile memristors owing to the difficulties in designing advanced memristive materials and achieving high-quality active layers on fiber electrodes. Herein we report a robust textile memristor based on an electrophoretic-deposited active layer of deoxyribonucleic acid (DNA) on fiber electrodes. The unique architecture and orientation of DNA molecules with the incorporation of Ag nanoparticles offer the best-in-class performances, e.g., both ultra-low operation voltage of 0.3 V and power consumption of 100 pW and high switching speed of 20 ns. Fundamental logic calculations such as implication and NAND are demonstrated as functions of textile chips, and it has been thus integrated with power-supplying and light emitting modules to demonstrate an all-fabric information processing system. © 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

关键词： DNA fiber electronics logic-in-memory computing memristors nanoparticles

来源：评论

学校读者我要写书评

暂无评论

Corrigendum to ‘Performance analysis of sCO 2 tube with high non-uniform heat flux: Thermal-fluid-structural evaluation and optimization’ [Volume 231, August 2023, 120849]

引用

Applied Thermal engineering 2023年 235卷

作者： Shuo Gao Yanjuan Wang Yi Li Qibin Liu Jinliang Xu The Beijing Key Laboratory of Multiphase Flow and Heat Transfer North China Electric Power University Beijing 102206 China Institute of Engineering Thermophysics Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 10049 China

来源：评论

学校读者我要写书评

暂无评论

Green preparation of silver nanofilms as SERS-active substrates for Rhodamine 6G detection

引用

VACUUM 2021年 187卷

作者： Zhu, Jiacheng Sun, Li Shan, Yuejin Zhi, Yuan Chen, Jian Dou, Binlin Su, Wenxian Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai Key Lab Multiphase Flow & Heat Transfer Jun Gong Rd 516 Shanghai 200093 Peoples R China Utsunomiya Univ Res Div Funct Mat Design Dept Mat & Environm Chem Yoto 7-1-2 Utsunomiya Tochigi 3218585 Japan Shanghai Minrula Biotechnol Co Ltd R&D Dept Bldg 15Haji Sixth Rd 218 Shanghai 201306 Peoples R China

A green and reliable seed-mediated electroless deposition method using the Sargentgloryvine stem extract as reducing and capping agent is explored to prepare silver nanofilms (Ag NFs) as surface-enhanced Raman scattering (SERS) active substrates. The average particle size of Ag NFs can be facilely controlled only by adjusting the amount of AgNO3 in the growth solution. Furthermore, the SERS properties of Ag NFs are established experimentally and their Raman enhancement mechanism is revealed by means of the scanning electron microscopy and the finite-difference time-domain simulation. It is found that high surface coverage and slight surface agglomeration of Ag NFs are beneficial for the amplification of Raman signal. Optimized Ag NFs display superior sensitivity towards Rhodamine 6G molecules and good reproducibility, indicating potential applications in SERS-based detection and analysis. Meanwhile, the proposed method to obtain Ag NFs provide a promising route for the preparation of other metal nanofilm.

关键词： Silver Thin films Deposition Sargentgloryvine stem extract Raman

来源：评论

学校读者我要写书评

暂无评论

Observation based study on atmospheric oxidation capacity in shanghai during late-autumn: Contribution from nitryl chloride

引用

ATMOSPHERIC ENVIRONMENT 2022年 271卷

作者： Lou, Shengrong Tan, Zhaofeng Gan, Guicheng Chen, Jun Wang, Haichao Gao, Yaqin Huang, Dandan Huang, Congyan Li, Xiaoqian Song, Ruifeng Wang, Hongli Wang, Meng Wang, Qian Wu, Yuhang Huang, Cheng Shanghai Acad Environm Sci State Environm Protect Key Lab Format & Prevent U Shanghai 200233 Peoples R China Forschungszentrum Julich Inst Energy & Climate Res IEK 8 Troposphere D-52428 Julich Germany Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai 200093 Peoples R China Sun Yat Sen Univ Sch Atmospher Sci Guangzhou Peoples R China Minist Educ Southern Marine Sci & Engn Guangdong Lab Zhuhai Guangdong Prov Observat & Res Stn Climate Environ Key Lab Trop Atmosphere Ocean Syst Zhuhai Peoples R China Chinese Res Inst Environm Sci State Key Lab Environm Criteria & Risk Assessment Beijing 100012 Peoples R China

Atmospheric oxidation processes are important to convert freshly emitted trace gases to secondary pollutants. ROx radicals (including hydroxyl radical (OH), hydroperoxyl radical (HO2), and organic peroxyl radical (RO2)) dominate the atmospheric oxidation capacity. In this study, measurements of RO(x & nbsp;& nbsp;)chemistry precursors and products are presented in shanghai, a megacity in eastern China during late autumn. During the campaign, two types of air masses are identified, one of which is warm air parcel characterized by relatively higher concentrations of particulate matters and ozone. An observational based chemical box model is utilized to simulate the radical chemistry. HONO is the most important radical source contributing more than one-third of the total radical primary source. However, alkene ozonolysis reactions not only serve as a non-photolytic source but also become relative important during polluted cases indicating the important role in polluted conditions. The maximum ClNO2 was 0.4 ppbv (5min averaged) with a 1h diurnal averaged maximum of 0.16 ppbv and 0.06 ppbv for polluted and clean cases, respectively. The contribution of ClNO2 photolysis to the total primary radical production is < 1% on 24h averaged based. Though the campaign was conducted in late autumn when ClNO2 was considered as a relatively important radical source compared to summer conditions, our results suggest the contribution of ClNO2 may vary from case to case. The role of Cl radical and OH radical in secondary pollution formation is explored. Although the model predicts that the concentrations of Cl radicals are orders of magnitude smaller than that of OH radicals, further model analysis highlight that the ozone production per VOC oxidation is more efficient due to Cl radical initiated the reaction chain compared to OH radical. The ubiquitous presence of ClNO2 with large spatial and temporal variability demonstrates that the contribution of ClNO2 to photochemical processes sh

关键词： Atmospheric Oxidation Capacity (AOC) Ozone production Nitryl Chloride shanghai

来源：评论

学校读者我要写书评

暂无评论

A study on the matching of constraint between steam turbine blade and laboratory specimens

引用

ADVANCES IN MECHANICAL engineering 2020年第5期12卷

作者： Yang, Jie Liu, Yuman Chen, Haofeng Univ Shanghai Sci & Technol Sch Energy & Power Engn Shanghai Key Lab Multiphase Flow & Heat Transfer Shanghai 200093 Peoples R China Univ Strathclyde Dept Mech & Aerosp Engn Glasgow Lanark Scotland

The matching of constraint between laboratory specimens and actual cracked structures is a key problem of the accurate structure integrity assessment. Different laboratory specimens and the steam turbine blade with different constraints were selected, the matching of constraint between steam turbine blade and laboratory specimens was investigated. The results shown that the steam turbine blade with 2c = 50 mm, a/2c = 0.20 has a matching constraint with single edge-notched bend specimen with a/W = 0.6 and single edge-notched tensile specimen with a/W = 0.3. The steam turbine blade with 2c = 50 mm, a/2c = 0.25 has a matching constraint with single edge-notched bend specimen with a/W = 0.7. The steam turbine blade with 2c = 50 mm, a/2c = 0.30 has a matching constraint with single edge-notched bend specimen with a/W = 0.5 and single edge-notched tensile specimen with a/W = 0.1. The steam turbine blade with 2c = 50 mm, a/2c = 0.35 has a matching constraint with single edge-notched bend specimen with a/W = 0.4, compact tension specimen with a/W = 0.3 and central-cracked tension specimen with a/W = 0.7. The steam turbine blade with a = 15 mm, a/2c = 0.30 has a matching constraint with compact tension specimen with a/W = 0.7 and single edge-notched tensile specimen with a/W = 0.5. The steam turbine blade with a = 15 mm, a/2c = 0.40 has a matching constraint with compact tension specimen with a/W = 0.4. The steam turbine blade with a = 15 mm, a/2c = 0.50 has a matching constraint with single edge-notched bend specimen with a/W = 0.5.

关键词： Constraint matching steam turbine blade laboratory specimen structure integrity assessment

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：