检索结果-内蒙古大学图书馆

A novel method for modeling the phase change of iron ore particles in the cohesive zone of a blast furnace

Particuology 2024年第3期86卷 252-261页

作者： Dianyu E Yingming Wen Jiayun Dan Youyuan Jiang Guangchao Wei Jiaxin Cui Jiangxi Provincial Key Laboratory for Simulation and Modelling of Particulate Systems Jiangxi University of Science and TechnologyNanchang330013China International Institute for Innovation Jiangxi University of Science and TechnologyNanchang330013China Ironmaking Plant Xiangtan Iron and Steel Corporation of Hunan HualingXiangtan411101China Schoolof Transportation and Vehicle Enginering Shandong University of TechnologyZibo255000China

Cohesive zone plays a vital role in the stable operation of a blast furnace(BF),yet the complex phase change process of iron ore particles in this zone is still not well *** this study,a novel one-dimensional(1D)unsteady phase change model was developed to elucidate the heat transfer and melting mechanisms of iron ore *** model validation,the effects of several key operating parameters(e.g.,particle diameter,gas velocity,initial temperature)on the phase change behavior of iron ore particles were analyzed,and the joint effect of multiple parameters was *** results show that larger-sized iron ore particles possess lower specific surface areas,which in turn reduces their convective heat absorption ***,the distance from the solid-liquid phase interface to the particle surface increases,thereby slowing down the movement of the phase interface and pro-longing the melting duration of the *** the gas velocity and the initial temperature does not have a significant impact on reducing the duration of the complete melting *** the specified conditions,it is observed that increasing the gas velocity by 3-fold and 9-fold results in a reduction of the melting duration by 2.4%and 8.3%,*** the initial temperature of iron ore particles results in a decrease in the core-to-surface temperature difference,a slower heating rate,and a shorter duration to achieve *** the factors affecting the melting process,the particle diameter is found to be the most significant in terms of the liquid phase precipitation,mushy zone thickness,and core-to-surface temperature difference of iron ore particles.

关键词： Blast furnace Iron ore melting Cohesive zone Heat transfer Phase change

来源：评论

学校读者我要写书评

暂无评论

Application of DEM modelling to grinding processes

Application of DEM modelling to grinding processes

引用

World Congress on Intelligent Control and Automation (WCICA)

作者： R.Y. Yang C.T. Jayasundara A.B. Yu Laboratory for Simulation and Modelling of Particulate Systems University of New South Wales Sydney NSW Australia

Understanding energy utilisation in grinding is critical to the process optimisation. In this paper, we demonstrated that the discrete element method (DEM) modelling, when combined with experimental measurements, can provide more realistic and reliable description of grinding processes. By incorporating particle grindability from experiments and energy condition from DEM simulations into a population balance model (PBM), we developed a multi-scale framework to predict mill performance. The model can be an invaluable tool in the design, control and optimisation of grinding processes.

关键词： Loading Media Powders Force Atmospheric modeling Predictive models Minerals

来源：评论

学校读者我要写书评

暂无评论

CFD modelling in Blast Furnace Ironmaking

CFD Modelling in Blast Furnace Ironmaking

引用

第九届中国钢铁年会

作者： Yansong Shen Aibing Yu Laboratory for Simulation and Modelling of Particulate Systems School of Materials Science and EngineeringThe University of New South Wales

Steel industry is one of the most energy-intensive industries,accounting for % of world greenhouse gas *** processes account for 0% of emissions in a steel *** understanding and optimization of blast furnace process is important in order to be competitive and sustainable under increasingly demanding *** modelling,facilitated by physical modelling,provides a cost-effective way for process design and *** particular,CFD modelling is widely used in academia and industry for its efficiency and *** study will discuss the role of CFD-based process models in the development of new technology for sustainable *** examples are used:modelling of a recent technologypulverized coal injection (Fig.1);and modelling of the whole blast furnace operation (Fig.2).It is demonstrated that CFD modelling indeed plays a significant role in process understanding and optimization,important to sustainable blast furnace ironmaking.

关键词： ironmaking blast furnace CFD

来源：评论

学校读者我要写书评

暂无评论

Contact analysis of different flow regimes in gas fluidization

引用

AIP Conference Proceedings 2013年第1期1542卷 1106-1109页

作者： Q. F. Hou Z. Y. Zhou A. B. Yu Laboratory for Simulation and Modelling of Particulate Systems School of Materials Science and Engineering The University of New South Wales Sydney NSW 2052 Australia

The particle contacts in different particle-fluid flow regimes, such as fixed, expanded and fluidized beds, in gas fluidization are investigated for group A and B powders by means of a combined approach of computational fluid dynamics anddiscrete element method. To establish the connection between macroscopic and microscopic descriptions of complex particle-fluid flows, focus is given to the correlation between coordination number (CN) and porosity (ε). It is found that the CN-ε relationship for group A powders has a transitional point between the expanded and fluidized bed flow regimes at a bulk scale, unlike group B powders. A new phase diagram is established in terms of CN-ε relationship that has two branches representing expanded and fluidized (bed) states.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Analysis of Voronoi clusters in the packing of uniform spheres

引用

AIP Conference Proceedings 2013年第1期1542卷 353-356页

作者： C. C. Wang K. J. Dong A. B. Yu Laboratory for Simulation and Modelling of Particulate Systems School of Materials Science and Engineering University of New South Wales Sydney NSW 2052 Australia

This paper presents a structural analysis on the packing of monosized spheres in terms of Voronoi clusters. The packings considered were generated by the discrete element method, with packing densities ranging from 0.2 to 0.74. The Voronoi clusters are composed of center particles and their neighbouring particles, which can be used to characterize the local packing structures in terms of the topological connections between particles, to be beyond the metric and topological properties of individual polyhedra as done previously. The types and distribution of clusters, together with coordination number and common geometrical neighbours determined by Voronoi polyhedra are quantified as a function of packing density. Random close packing is shown to correspond to a turning point of these evolutions.

关键词：

来源：评论

学校读者我要写书评

暂无评论

modelling in-furnace phenomena of pulverized coal injection in ironmaking blast furnace: Effect of coke bed porosities

Modelling in-furnace phenomena of pulverized coal injection ...

引用

作者： Shen, Yansong Yu, Aibing Austin, Peter Zulli, Paul Laboratory for Simulation and Modelling of Particulate Systems School of Materials Science and Engineering University of New South Wales Sydney NSW 2052 Australia BlueScope Steel Research P.O. Box 202 Port Kembla NSW 2505 Australia

In order to understand the complicated in-furnace phenomena of pulverized coal injection in ironmaking blast furnaces, a three-dimensional CFD model has been developed to simulate the gas-particle behaviors in not only raceway cavity but also the surrounding coke packed bed under practical conditions. The model considers two different fuels, pulverized coal and coke bed. The model is validated against the measurements in terms of coal burnout and gas composition, respectively. The typical in-furnace phenomena are simulated. Then an array of parametric study is carried out to evaluate the effects of local porosities of different coke bed zones. The qualitative and quantitative analysis is conducted. The results indicate that the local porosities of different coke bed zones can affect the coal burnout and gas composition differently: significantly in the deadman zone but insensitive in the dripping zone. In addition, the present model is able to provide a more reliable indicator to describe coal burnout, i.e. burnout over raceway surface, rather than burnout only along the centerline. The model is expected to be useful for understanding the flow-thermo-chemical behaviors and then optimizing the PCI operation in full-scale blast furnaces. © 2011 Elsevier Ltd. All rights reserved.

关键词： Computational fluid dynamics

来源：评论

学校读者我要写书评

暂无评论

Particle shape effect on hydrodynamics and heat transfer in spouted bed:A CFD-DEM study

引用

Particuology 2022年第10期20卷 10-21页

作者： Dianyu E Peng Zhou Suya Guo Jia Zeng Jiaxin Cui Youyuan Jiang Yuanxiang Lu Zeyi Jiang Zhengquan Li Shibo Kuang Jiangxi Provincial Key Laboratory for Simulation and Modelling of Particulate Systems Jiangxi University of Science and TechnologyGanzhou 341000China Ironmaking Plant Xiangtan Iron and Steel Corporation of Hunan HualingXiangtan 411101China School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China ARC Research Hub for Computational Particle Technology Department of Chemical EngineeringMonash UniversityClaytonVIC 3800Australia

Spouted bed has drawn much attention due to its good heat and mass transfer efficiency in many chemical *** the flow patterns and heat and mass transfer inside a spouted bed can help optimize the spouting ***,in this study,the effects of particle shape on the hydrodynamics and heat transfer in a spouted bed are *** is done by using a validated computational fluid dynamics-discrete element method(CFD-DEM)model,considering volume-equivalent spheres and oblate and prolate *** results are analysed in detail in terms of the flow pattern,microstruc-ture,and heat transfer *** numerical results show that the prolate spheroids(Ar=2.4)form the largest bubble from the beginning of the spouting process and rise the highest because the fluid drag forces can overcome the interlocking and particle-particle frictional *** with spherical particles,ellipsoidal spheroids have better mobility because of the stronger rotational kinetic energy resulting from the rough surfaces and nonuniform *** addition,the oblate spheroid system exhibits better heat transfer performance benefiting from the larger surface area,while prolate spheroids have poor heat transfer efficiency because of their orientation *** findings can serve as a reference for optimizing the design and operation of complex spouted beds.

关键词： Spouted bed Gas-solid flow Particle shape CFD-DEM Heat transfer

来源：评论

学校读者我要写书评

暂无评论

Computational study of heat transfer in gas fluidization

引用

AIP Conference Proceedings 2013年第1期1542卷 1114-1117页

Heat transfer in gas fluidization is investigated at a particle scale by means of a combined discrete element method and computational fluid dynamicsapproach. To develop understanding of heat transfer at various conditions, the effects of a few important material properties such as particle size, the Hamaker constant and particle thermal conductivity are examined through controlled numerical experiments. It is found that the convective heat transfer is dominant, and radiative heat transfer becomes important when the temperature is high. Conductive heat transfer also plays a role depending on the flow regimes and material properties. The heat transfer between a fluidized bed and an immersed surface is enhanced by the increase of particle thermal conductivity while it is little affected by Young’s modulus. The findings should be useful for better understanding and predicting the heat transfer in gas fluidization.

关键词：

来源：评论

学校读者我要写书评

暂无评论

A method for structural analysis of disordered particle systems

引用

AIP Conference Proceedings 2013年第1期1542卷 373-376页

作者： Z. A. Tian K. J. Dong A. B. Yu Laboratory for Simulation and Modelling of Particulate Systems School of Materials Science and Engineering University of New South Wales Sydney NSW 2052 Australia

We present a brief overview of a method which can identify different 3D local structures in ordered and disordered systems. Its effectiveness is demonstrated in the analysis of the structures of sphere packings, the structural evolution of a rapid cooling process of silver liquid, and the inner structure of a metal nanocluster. Quantifying local structures by means of a topological criterion, this method is parameter-free and scale-independent, and can generally be used for structural analysis of amorphous systems involving atoms or particles at different length scales.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Engineering Nanoparticles for Energy and Environmental Applications

Engineering Nanoparticles for Energy and Environmental Appli...

引用

主题：引领工业革命新浪潮——2014第四届国际纳米科技大会

作者： Xuchuan Jiang Laboratory for Simulation and Modelling of Particulate Systems (SIMPAS)School of Materials Science and Engineering The University of New South Wales

Energy and environment have emerged as the most critical challenges to the sustainable global developments in the 21st century. Nanomaterials have attracted much more attention because of their unique ftmctional properties and broad applications in energy and environment. This presentation is going to talk about how to engineer nanoparticles for energy and environmental applications, through the development of synthesis strategies of metal oxide nanoparticles, fundamental understandings of particle growth and understanding the relationship between structure and functions, specificallyfocusing on gas sensors, smart window coatings and self-cleaning films in this talk.

关键词： Engineering Nanoparticles for Energy and Environmental Applications

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：