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Simultaneous desulfurization and denitrification of sintering flue gas via composite absorbent

Chinese Journal of Chemical Engineering 2016年第8期24卷 1104-1111页

作者： Jie Wang Wenqi Zhong Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and Environment Southeast University Centre for Simulation and Modelling of Particulate Systems Southeast University–Monash University Joint Research School

Experiments on simultaneous absorption of SO_2 and NO_X from sintering flue gas via a composite absorbent NaClO_2/NaClO were carried out. The effects of various operating parameters such as NaClO_2 concentration(ms), NaClO concentration(mp), molar ratio of NaClO_2/NaClO(M), solution temperature(TR), initial solution pH, gas flow(Vg) and inlet concentration of SO_2(CS) and NO(CN) on the removal efficiencies of SO_2 and NO were discussed. The optimal experimental conditions were determined to be initial solution pH = 6, TR=55 °C and M = 1.3 under which the average efficiencies of desulfurization and denitrification could reach99.7% and 90.8%, respectively. Moreover, according to the analysis of reaction products, it was found that adding NaClO to NaClO_2 aqueous solution is favorable for the generation of ClO_2 and Cl_2 which have significant effect on desulfurization and denitrification. Finally, engineering experiments were performed and obtained good results demonstrating that this method is practicable and promising.

关键词： Simultaneous desulfurization and denitrification Sintering flue gas Composite absorbent

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Settling of particles in liquids

Settling of particles in liquids

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5th International Conference on the Micromechanics of Granular Media: Powders and Grains 2005

作者： Dong, K.J. Zou, R.P. Yang, R.Y. Yu, A.B. Centre for Simulation and Modelling of Particulate Systems School of Materials Science and Engineering University of New South Wales Kensington Australia

ISBN: (纸本)0415383471

This paper presents DEM modeling of the setting of particles in liquids under conditions similar to sedimentation/filtration process. The liquid flow is supposed to be one-dimensional, and the motion of particles is three-dimensional. Various forces are incorporated in determining the motion of the particles, including the particle-particle interaction forces due to collision and the van der Waals attraction, and the particle-fluid interactions such as buoyancy, drag and lift forces. The model is validated by comparing the simulation and experiment results. The packing structures are analyzed in terms of porosity, radial distribution function and coordination number. The effects of key variables such as particle size, Hamaker constant, fluid density and viscosity are examined through a series of controlled numerical experiments. The roles of various forces related to these variables are also discussed. © 2005 Taylor & Francis Group.

关键词： Particle size

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Stress distributions of steady and unsteady state hopper flows

Stress distributions of steady and unsteady state hopper flo...

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5th International Conference on the Micromechanics of Granular Media: Powders and Grains 2005

作者： Zhu, H.P. Yu, A.B. Centre for Simulation and Modelling of Particulate Systems School of Materials Science and Engineering University of New South Wales Sydney Australia

ISBN: (纸本)0415383471

This paper presents a numerical study of the stress distributions of the steady and unsteady state granular flowsin a cylindrical hopper with flat bottom by means of the combined approach of the Discrete Element Method (DEM) and an averaging method. For both flows, the simulations were conducted under comparable conditions. Four independent components of the stress tensor for the three dimensional flows are investigated. The results show that the trends of the stresses of the two flows are similar, although there are some differences in magnitude. The magnitudes of the stresses decrease with time or number of particles except in the orifice region. © 2005 Taylor & Francis Group.

关键词： Stress concentration

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An analysis of the chaotic motion of particles of different sizes in a gas fluidized bed

An analysis of the chaotic motion of particles of different ...

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2006 AIChE Spring National Meeting - 5th World Congress on Particle Technology

作者： Feng, Y.Q. Yu, A.B. Centre for Simulation and Modelling of Particulate Systems School of Materials Science and Engineering University of New South Wales Sydney NSW 2052 Australia

The dynamic behavior of individual particles during the mixing/segregation process of particle mixtures in a gas fluidized bed is analyzed. The analysis is based on the results generated from discrete particle simulation, with the focus on the trajectory of and forces acting on individual particles. Typical particles are selected representing three kinds of particle motions: a flotsam particle which is initially at the bottom part of the bed and finally fluidized at the top part of the bed;a jetsam particle which is initially at the top part of the bed and finally stays in the bottom de-fluidized layer of the bed;and a jetsam particle which is intermittently joining the top fluidized and bottom de-fluidized layer. The results show that the motion of a particle is chaotic at macroscopic or global scale, but can be well explained at microscopic scale in terms of its interaction forces and contact conditions with other particles, particle-fluid interaction force, and local flow structure. They highlight the need for establishing a suitable method to link the information generated and modeled at different time and length scales.

关键词： Fluidization

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Numerical investigation of unsteady state hopper flow

Numerical investigation of unsteady state hopper flow

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2006 AIChE Spring National Meeting - 5th World Congress on Particle Technology

作者： Zhu, H.P. Yu, A.B. Centre 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 numerical study of the unsteady state granular flow in a cylindrical hopper with flat bottom by means of the discrete element method. The distributions of the physical properties including velocity, force and stress are investigated qualitatively or quantitatively. It is shown that this flow has four different flow zones, in which these distributions are different. At different discharging times, the trends of the characteristics are similar, but their magnitudes different. The results also show that the trends of the unsteady and steady state hopper flows in terms of velocity, force and stress are similar. But, quantitatively, there are differences in these physical properties for the two flows.

关键词： Physical properties

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Effect of packing method on packing formation and the correlation between packing density and interparticle force

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Particuology 2020年第1期18卷 170-181页

作者： Yongli Wu Qinfu Hou Kejun Dong Aibing Yu ARC Research Hub for Computational Particle Technology Department of Chemical EngineeringMonash UniversityVIC 3800Australia Centre for Infrastructure Engineering Western Sydney UniversityPenrithNSW2751Australia Centre for Simulation and Modelling of Particulate Systems Southeast University-Monash University Joint Research InstituteSuzhou 215123China

The packing of cohesive particles is of paramount importance in many industries because the packing structure is closely related to process performance.A general relation between packing density and interparticle force was previously proposed based on packing structures formed without dynamic fluid *** universality is examined here in two different packings,formed in settling and defluidization of static and dynamic fluids,***,it is shown that the packings of the same particles formed by two different methods have different structures because of different impact-induced ***,a one-to-one relationship between packing density and structural properties still holds regardless of the different packing methods,and the force distribution in those packings obeys similar ***,the packing densities obtained by the different methods are demonstrated to be universally correlated with the ratio of the interparticle force to the effective *** findings indicate that different phenomena of particulate systems at a macro-or meso-scale may share similar microscopic origins,with the interparticle force playing a crucial role.

关键词： Packing Interparticle force Packing history Discrete element method Computational fluid dynamics

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DEM modelling of disc wear in the IsaMill process

DEM modelling of disc wear in the IsaMill process

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9th International Conference on Bulk Materials Storage, Handling and Transportation, ICBMH 2007

作者： Jayasundara, C.T. Yang, R.Y. Yu, A.B. Curry, D. Centre for Simulation and Modelling of Particulate Systems School of Materials Science and Engineering University of New South Wales Sydney NSW 2052 Australia Xstrata Technology Brisbane QLD 4000 Australia

In the IsaMill process, the cost of disc replacement due to wear is high because of the high expense of shut down time for the replacement. Hence predicting wear pattern would provide useful information about the disc life span. We have developed a wear model based on the discrete element method (DEM) to predict the disc wear pattern in a simplified IsaMill. The material wear is proportional to the energy dissipation at the contact point. The simulations show that discs are gradually worn with time in a similar pattern to that observed in practice. Power consumption increases as discs are worn out due to increase of impact energy intensity.

关键词： Finite difference method

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Numerical simulation of particle dynamics in different flow regimes in a rotating drum

Numerical simulation of particle dynamics in different flow ...

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9th International Conference on Bulk Materials Storage, Handling and Transportation, ICBMH 2007

作者： Yang, R.Y. Yu, A.B. McElroy, L. Bao, J. Centre for Simulation and Modelling of Particulate Systems School of Materials Science and Engineering University of New South Wales Sydney Australia School of Chemical Engineering and Science University of New South Wales Sydney Australia

This work simulates the particle flow in a rotating drum based on the discrete element method. By varying the drum rotation speeds, different flow regimes are generated and the flow properties, such as angle of repose, flow density and particle collision, were analysed. It is shown that the dynamic angle of repose has little change in the rolling regime but has a jump in the cascading and cataracting regimes. The flow density distribution shows a strong peak at the position corresponding to the random loose packing, but becomes more dilated with the increasing drum rotation speed. Both the collision energy and collision frequency increase with the rotation speed. The collision energy distributions have similar profiles at different rotation speeds, indicating there may exist a scaling factor against which all distributions can be plotted in one curve. The collision frequency shows a linear increase with the rotation speed but the collision frequency of the particle-wall collision increases much faster than that of the particle-particle. The results obtained from the simulations can be used to identify a quantitative index for characterising different regimes.

关键词： Rotation

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DISCRETE AND CONTINUUM modelling OF GRANULAR FLOW

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China Particuology 2005年第6期3卷 354-363页

作者： H. P. Zhu Y. H. Wu A. B. Yu Centre for Simulation and Modelling of Particulate Systems School of Materials Science and Engineenng the University of New South Wales Sydney NSW 2052 Australia Department of Mathematics and Statistics Curtin University of Technology Perth WA 6845 Australia

This paper analyses three popular methods simulating granular flow at different time and length scales： discrete element method （DEM）, averaging method and viscous, elastic-plastic continuum model. The theoretical models of these methods and their applications to hopper flows are discussed. It is shown that DEM is an effective method to study the fundamentals of granular flow at a particle or microscopic scale. By use of the continuum approach, granular flow can also be described at a continuum or macroscopic scale. Macroscopic quantities such as velocity and stress can be obtained by use of such computational method as FEM. However, this approach depends on the constitutive relationship of materials and ignores the effect of microscopic structure of granular flow. The combined approach of DEM and averaging method can overcome this problem. The approach takes into account the discrete nature of granular materials and does not require any global assumption and thus allows a better understanding of the fundamental mechanisms of granular flow. However, it is difficult to adapt this approach to process modelling because of the limited number of particles which can be handled with the present computational capacity, and the difficulty in handling non-spherical particles. Further work is needed to develoo an aoorooriate aooroach to overcome these problems.

关键词： granular flow hopper flow discrete element method average method continuum approach

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Averaging method of granular materials

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Physical Review E 2002年第2期66卷 021302-021302页

作者： H. P. Zhu A. B. Yu []Centre for Computer Simulation and Modelling of Particulate Systems School of Materials Science and Engineering The University of New South Wales Sydney New South Wales 2052 Australia

This paper presents an averaging method to link discrete to continuum variables of granular materials. Compared to the other methods proposed in the literature, it has advantages of being applicable to all flow regimes, and to granular flows with or without the effect of physical boundaries. Its application is demonstrated in the determination of the macroscopic properties such as mass density, velocity, stress, and couple stress distributions of a hopper flow, where the discrete results are generated by means of discrete particle simulation. While highlighting the need for considering properly the effect of physical boundaries, the results indicate that the proposed method is an effective way to determine the flow properties of granular materials.

关键词： Granular materials

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