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SSRN 2022年

作者： Dianyu, E. Tan, Cong Li, Jing Liu, Sida Zhou, Zongyan Cui, Jiaxin Yi, Lei Jiangxi Provincial Key Laboratory for Simulation and Modelling of Particulate Systems Jiangxi University of Science and Technology Nanchang330013 China International Institute for Innovation Jiangxi University of Science and Technology Nanchang330013 China ARC Research Hub for Computational Particle Technology Department of Chemical and Biological Engineering Monash University VIC3800 Australia

The floor-standing air conditioners (FSACs) have been widely used in civil and office buildings because of its advantages of high cooling/heating capacity and easy installation. The major challenge of FSACs is to meet the requirements of thermal comfort and indoor air quality (IAQ) while the operation energy consumption should be minimized. This study extensively examines the effects of some key operation parameters on the FSAC performance using validated computational fluid dynamics (CFD) method. The operation parameters include controllable supply vane angle, supply air velocity, supply air temperature, and uncontrollable outdoor weather condition. The main ventilation performance is assessed by indices such as predicted mean vote (PMV), predicted percent dissatisfied (PPD), draught rate (DR), local mean age of air (LMAA), and energy consumption (P system ). The relative importance of the operation parameters for each ventilation performance index is identified through evaluating the individual effects of the operation parameters on the ventilation performance. By comparing the individual effects and combined effects of the operation parameters on the ventilation performance, it is found that the variations of PMV, PPD, DR, LMAA and P system caused by the combined effects can be accounted by the corresponding most important operation parameters by 90.6%, 97.4%, 77.1%, 95.1% and 79.2%, respectively. Additionally, the outdoor weather conditions do not significantly affect DR, PPD and LMAA, but can shift PMV to uncomfortable levels. Finally, the constant-air-volume (CAV) system is recommended for FSACs during the steady stage and a simplified and optimized operation strategy is proposed. © 2022, The Authors. All rights reserved.

关键词： Sensitivity analysis

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Advances in reduction of NO_x and N_2O emission formation in an oxy-fired fluidized bed boiler

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Chinese Journal of Chemical Engineering 2019年第2期27卷 426-443页

作者： Khalid El Sheikh Mohammad Jakir Hossain Khan Mahar Diana Hamid Siddhartha Shrestha Brahim Si Ali G.A.Ryabov Lya A.Dolgushin Mohd Azlan Hussain Tatiana V.Bukharkina Elena A.Gorelova Dmitry Mendeleev University of Chemical Technology of Russia Department of Chemical Engineering Faculty of Engineering University of Malaya Laboratory for Simulation and Modelling of Particulate Systems Department of Chemical Engineering Monash University All-Russian Thermal Engineering Institute VTI

Fossil fuel combustion is one of the major means to meet the mounting global energy demand. However, the increasing NO_x and N_2 O emissions arising from fossil fuel combustion process have hazardous effects. Thus, mitigating these gases is vital to attain a sustainable environment. Interestingly, oxy-fuel combustion in fluidized bed for carbon capture and minimized NO_x emissions is strongly sustainable compare to the other approaches. It was assessed that NO_x formation and fuel-N conversion have significant limitation under oxy-fluidized bed compared to air mode and the mechanism of NO_x formation is still deficient and requires further development. In addition, this review paper discussed the potential of primary measure as low emission process with others supplementary techniques for feasible NO_x reduction. The influences of combustion mode, operating parameters, and reduction techniques such as flue gas recirculation, oxygen staging, biomass co-firing, catalyst, influence of fluidized bed design and structure, decoupling combustion and their merges are respectively evaluated. Findings show that significant minimization of NO_x emission can be achieved through combination of primary and secondary reduction techniques.

关键词： Oxy-fuel combustion Fluidized bed technology Biomass blend Primary/secondary measures NOx emission

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Numerical Study of Percolation and Seepage Behaviors in Ion-Adsorption-Type Rare Earth Ore Leaching Process

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Mathematical Problems in Engineering 2023年第1期2023卷

作者： Dianyu, E. Su, Zhongfang Zeng, Jia Yang, Liuyimei Li, Jing Xu, Qiang Wang, Lin Cui, Jiaxin Jiangxi Provincial Key Laboratory for Simulation and Modelling of Particulate Systems Jiangxi University of Science and Technology Nanchang330013 China International Institute for Innovation Jiangxi University of Science and Technology Nanchang330013 China Ganjiang Innovation Academy Chinese Academy of Sciences Ganzhou341000 China ARC Research Hub for Computational Particle Technology Department of Chemical and Biological Engineering Monash University ClaytonVIC3800 Australia State Key Laboratory of Multiphase Flow in Power Engineering Xi'An Jiaotong University Xi'an710049 China Delft University of Technology Delft Netherlands

Ionic rare earth ore is a type of featured rare earth ore in China. Its mining process suffers from a long leaching cycle and considerable consumption of leaching agents. Improving mining efficiency requires a sound physical understanding of the leaching process. In this study, the CFD-based numerical model is used to analyze the physical process of leaching through porous media formed by particles. The simulation results indicate that a lower packing porosity and smaller particles packed granular porous medium result in much larger energy dissipation during seepage, and the energy dissipation increases with seepage velocity. It is found that when the seepage velocity increases to a certain high value, the energy dissipation exceeds the value predicted by Darcy's law, which is mainly caused by liquid turbulence. Additionally, the effect of particle shape is examined. The results show that the granular medium composed of prolate particles causes larger energy dissipation than oblate particles, and spherical particles play the least role. This phenomenon may result from the particle shape affecting the area of the frontal contact surface between particles and liquid. The results provide new insights into the fundamental understanding of percolation and seepage behaviors in the ion-adsorption-type rare earth ore leaching process. © 2023 E. Dianyu et al.

关键词： Energy dissipation

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Corrigendum to “Boric acid-regulated gelation and ethanol-assisted preparation of polybenzoxazine aerogels” [Chem. Eng. J. 486 (2024) 150228]

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Chemical Engineering Journal 2025年 506卷

作者： Jinlong Zhou Yunyun Xiao Saihui Liu Zeyu Li Xinyi Liu Sizhao Zhang Zhengquan Li International Institute for Innovation Jiangxi University of Science and Technology Nanchang 330013 PR China Jiangxi Provincial Key Laboratory for Simulation and Modelling of Particulate Systems Nanchang 330013 PR China School of Energy and Mechanics Jiangxi University of Science and Technology Nanchang 330013 P.R. China

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Numerical Investigation into the Impact of Oxy-Fuel Combustion on the Thermochemical State and Slab Heating Behaviour Inside a Metallurgical Heating Furnace

SSRN

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SSRN 2024年

作者： Dianyu, E. Yang, Yifeng Weng, Lingyi Yang, Yingxin Liu, Yonggang Chen, Chao Cui, Jiaxin Liu, Lingling Jiangxi Provincial Key Laboratory for Simulation and Modelling of Particulate Systems Jiangxi University of Science and Technology Nanchang330013 China International Institute for Innovation Jiangxi University of Science and Technology Nanchang330013 China School of Energy and Mechanical Engineering Jiangxi University of Science and Technology Nanchang330013 China Faculty of Materials Metallurgy and Chemistry Jiangxi University of Science and Technology Ganzhou341000 China Xinyu Iron and Steel Group Co. Ltd Xinyu338001 China College of Materials Science and Engineering Taiyuan University of Technology Taiyuan030024 China State Key Laboratory of Vanadium Titanium Resources Comprehensive Utilization Chengdu610031 China Pangang Group Research Institute Co. Ltd. Chengdu610031 China Monash University Australia

Oxy-fuel combustion is a promising technology for the merits of energy-saving and NOx emission reduction and has been gradually promoted to the application of metallurgical heating furnaces. For the purpose of understanding and optimizing the heating process of the industrial furnace, with a particular focus on the effect of fuel types and oxy-fuel combustion, a comprehensive transient 3D CFD model was built for the simulation of the complicated in-furnace thermochemical states and the gas-solid heat transfer at multi-scales. It was observed that under constant calorific heat input conditions, the fuel composition appears to have little influence on the internal thermal state and the slab heating. Meanwhile, oxy-fuel combustion enhances the in-furnace heat radiation intensity, leading to higher average gas and thus higher slab temperatures. However, the in-furnace thermal distribution becomes uneven and the slab internal temperature difference increases. Under the prerequisite that the slab temperature leaving the furnace is between 1373-1573 K and the maximum internal temperature difference is less than 50 K/m, the production efficiency can be increased by 6.25% when oxy-fuel combustion is applied, with the corresponding slab residence time decreases from 7424s to 6960s. © 2024, The Authors. All rights reserved.

关键词： Optimization

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Using simulation and Digital Twins to Innovate: Are we Getting Smarter?

Using Simulation and Digital Twins to Innovate: Are we Getti...

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2021 Winter simulation Conference, WSC 2021

作者： Taylor, Simon J E Johansson, Bjorn Jeon, Sumin Lee, Loo Hay Lendermann, Peter Shao, Guodong Brunel University London Modelling Simulation Group Department of Computer Science Uxbridge United Kingdom Chalmers University of Technology Department of Industrial and Materials Science Gothenburg41296 Sweden Digital Industries Customer Services Siemens Pte Ltd Singapore National University of Singapore Department of Industrial Systems Engineering Management Singapore D-SIMLAB Technologies Pte Ltd Singapore National Institute of Standards and Technology Engineering Laboratory GaithersburgMD20899 United States

ISBN: (纸本)9781665433112

Digital Twins have recently emerged as a major new area of innovation. Digital Twins are often found at the core of 'smart' solutions that have also emerged as major areas of innovation. Modeling and simulation (MS) approaches create a model of a real-world system that is linked to data sources and is used to simulate and predict the behavior of its real-world counterpart. On the face of it Digital Twins and MS appear to be similar, if not the same. Is this actually the case? Are the two fields really separate or is Digital Twin research re-inventing the 'MS wheel'? To investigate these relationships, in this panel we will explore some contemporary innovations with Digital Twins and discuss whether or not Digital Twins is a contemporary 'refresh' or 'rebranding' of MS or if there are exciting new synergies. © 2021 IEEE.

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Co-firing of coal and biomass in oxy-fuel fluidized bed for CO2 capture: A review of recent advances

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Chinese Journal of Chemical Engineering 2019年第10期27卷 2261-2272页

作者： Qinwen Liu Yan Shi Wenqi Zhong Aibing Yu Key Laboratory of Energy Thermal Conversion and Control of the Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 210096China Center for Simulation and Modelling of Particulate Systems Southeast University-Monash University Joint Research InstituteSuzhou 215000China 3 ARC Research Hub for Computational Particle TechnologyDepartment of Chemical EngineeringMonash UniversityClaytonVIC 3800Australia

The co-firing of coal and biomass in oxy-fuel fluidized beds is one of the most promising technologies for capturing *** technology has attracted wide attention from academia and industry in recent years as a negative emission method to capture CO2 produced by carbon contained in *** the past decades,many studies have been carried out regarding experiments and numerical simulations under oxy-fuel combustion *** paper firstly briefly discusses the techno-economic viability of the biomass and coal co-firing with oxycombustion and then presents a review of recent advancements involving experimental research and computational fluid dynamics(CFD)simulations in this *** studies on mechanism research,such as thermogravimetric analysis and tube furnace experiments,and fluidized bed experiments based on oxy-fuel fluidized beds with different sizes as well as the main findings,are summarized as a part of this *** has been recognized that CFD is a useful approach for understanding the behaviors of the co-firing of coal and biomass in oxyfuel fluidized *** summarize a recent survey of published CFD research on oxy-fuel fluidized bed combustion,which categorized into Eulerian and Lagrangian ***,we discuss the challenges and interests for future research.

关键词： Oxy-fuel combustion Co-firing of coal and biomass Oxy-fuel fluidized bed CFD simulation

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A CFD-DEM study of bubble properties in fluidzed beds operated with a single jet 8

A CFD-DEM study of bubble properties in fluidzed beds operat...

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8th World Congress on Particle Technology 2018: Keynotes and Plenaries

作者： Shrestha, Siddhartha Gan, Jieqing Yu, Aibing Zhou, Zongyan Laboratory for Simulation and Modelling of Particulate Systems Department of Chemical Engineering Monash University VIC3800 Australia

ISBN: (纸本)9781510869769

Bubbles properties play an important role in determining the characteristics of gas-solid fluidized beds and thus influence the bed performance significantly. In this work, the bubble properties are studied by the combined approach of CFD and DEM for bubbling gas-solid fluidized beds operated with a continuous central jet. The process of the continuous injection of a central air jet to the bed is successfully reproduced featured with the formation of series of bubbles which rise through the bed and burst at the bed top. The bubbles are categorised as two types: primary/leading bubbles and trailing bubbles. The size of the primary bubble keeps on increasing with bed height while the size of the trailing bubble decreases since trailing bubble is coalescing with the primary bubble. The primary bubbles although formed at different times are of similar shape while the trailing bubbles are generally elongated in shape. The bubble velocity is distinctly different for primary and trailing bubbles. © 2018 8th World Congress on Particle Technology 2018: Keynotes and Plenaries. All rights reserved.

关键词： Fluidized beds

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Size-induced axial segregation of binary mixtures in rotating drum of different lengths

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Chemical Engineering Science 2025年 316卷

作者： Jielong He Yuelei Wang Liuyimei Yang Jin Xu Qijun Zheng Sida Liu Zongyan Zhou Jiangxi Provincial Key Laboratory of Particle Technology Jiangxi University of Science and Technology Nanchang 330013 China Research Centre for Intelligent Mineral Processing & Metallurgy International Institute for Innovation Jiangxi University of Science and Technology Nanchang 330013 China Ganjiang Innovation Academy Chinese Academy of Sciences Ganzhou 341000 China Centre for Simulation and Modelling of Particulate Systems Monash-Southeast University Joint Research Institute Suzhou 215123 China ARC Research Hub for Smart Process Design and Control Department of Chemical and Biological Engineering Monash University Melbourne VIC 3800 Australia

This study investigates the size-induced axial segregation of binary mixtures in rotating drums, particularly focusing on the effect of drum length. The results indicate that long drums require more time to achieve stable segregation and form more segregation bands. The core region under the free bed surface remains predominantly filled with small particles, indicating that radial segregation occurs simultaneously with the axial segregation. The angle of repose of large particle bands is consistently greater than that of small particle bands, which drives the migration of large particles. Short drums are more sensitive to changes in rotational speed, while long drums with moderate rotational speed promote the formation of segregation bands. The width of small particle bands shows an increasing–decreasing-stabilizing trend with the drum length increasing. An analysis of particle velocities reveals that the characteristics of segregation bands are closely related to the relative velocity difference between large and small particles.

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The demagnetization factor for randomly packed spheroidal particles

arXiv

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arXiv 2019年

作者： Bjørk, R. Zhou, Z. Department of Energy Conversion and Storage Technical University of Denmark - DTU Frederiksborgvej 399 RoskildeDK-4000 Denmark Laboratory for Simulation and Modelling of Particulate Systems Department of Chemical Engineering Monash University ClaytonVIC3800 Australia

We investigate if the demagnetization factor for a randomly packed powder of magnetic spheroidal particles depend on the shape of the spheroidal particles and what the internal variation in magnetization is within such a powder. A spheroid is an ellipsoid of revolution, i.e. an ellipsoid with two semi-major axis being equal. The demagnetization factor is calculated as function of particle aspect ratio using two independent numerical models for several different packings, and assuming a relative permeability of 2. The calculated demagnetization factor is shown to depend on particle aspect ratio, not because of direct magnetic interaction but because the particle packing depend on the aspect ratio of the particles. The relative standard deviation of the magnetization across the powder was 3%-8%, increasing as the particle shape deviates from spherical, while the relative standard deviation within each particle was relatively constant around 5%. Copyright © 2019, The Authors. All rights reserved.

关键词： Magnetization

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