Article
Metallurgy & Metallurgical Engineering
Serg Chanouian, Bjorn Ahlin, Anders Tilliander, Mikael Ersson
Summary: Small-scale physical models are commonly used to investigate gas-stirred processes in steelmaking practice. This study investigates the effect of converter inclination on mixing time and jet-penetration length. The results show that the penetration length is independent of inclination angle, while the mixing time is influenced by various factors such as bath height to diameter ratio and gas flow rate.
STEEL RESEARCH INTERNATIONAL
(2021)
Article
Engineering, Chemical
Mingfei Sun, Hongbin Zhang, Jieyu Zhang, Bo Wang
Summary: The iron bath gasifier studied in this paper is a new type of reactor that handles organic solid waste, and it involves complex transport phenomena such as high temperature, multiphase flow, mixing, and chemical reaction. It is important to study the flow and mass transfer behavior in the reactor. Through water modeling experiments and numerical simulations, the influence of different process parameters on the mixing behavior of the molten pool was investigated. The experimental results were compared with numerical simulation results to validate the mathematical model for future optimization of process parameters. These studies are significant for optimizing reactor design and improving process parameters.
Article
Agronomy
Daozong Sun, Weikang Liu, Zhi Li, Xurui Zhan, Qiufang Dai, Xiuyun Xue, Shuran Song
Summary: This study aims to design an online pesticide mixing apparatus based on pipeline spraying to reduce pesticide waste and environmental pollution. By analyzing the changes of four key structural parameters and considering three evaluation indexes, the optimal structure parameters of the apparatus are determined.
Article
Computer Science, Information Systems
Wenyong Guo, Tianxiang Chen, Alex Q. Q. Huang
Summary: Control bandwidth and damping performance are two key specifications for high-order LC and LCL filter-based converters. This paper proposes a control bandwidth-optimized active damping control strategy for these converters. It simplifies the control bandwidth optimization by using a generalized controller and a novel delay compensator, while the particle swarm optimization method is used to optimize the parameters of both the controller and delay compensator simultaneously. Experimental results demonstrate the effectiveness of the proposed controller.
Article
Engineering, Electrical & Electronic
Min Chen, Dongbo Zhang, Ning Chen, Bodong Li, Xiaoqing Wang, Xinnan Sun, Feng Jiang
Summary: This letter proposed a coupled resonant inductor structure for CLLC bidirectional converter, which can effectively reduce the number and volume of magnetic components and the oscillation caused by parasitic parameters. An optimized current detection method based on magnetic element voltage detection is also proposed to avoid the use of bulky and costly current sensors. Synchronous rectification is realized with the detection to improve efficiency.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Chemistry, Analytical
Muhammad Zain Yousaf, Muhammad Faizan Tahir, Ali Raza, Muhammad Ahmad Khan, Fazal Badshah
Summary: In this study, a probabilistic model based on local information and a multilayer artificial neural network is proposed to determine the location of dc-link faults in MT-HVdc networks. The model combines discrete wavelet transforms and Bayesian optimization. Through training and optimization, the proposed method accurately estimates the fault site with high robustness.
Article
Metallurgy & Metallurgical Engineering
Matin Ghadimi Rezaei, Pooyan Hashemi Tari, Mohammad Emamzadeh, Leili Tafaghodi Khajavi
Summary: The study highlights the importance of gas injection mixing in molten phase metallurgical processes to achieve homogeneity in products. The efficiency of mixing is influenced by operational variables and physical properties of the molten phases. Numerical simulation results demonstrate the impact of various parameters on mixing time.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2021)
Article
Materials Science, Multidisciplinary
Shuai Zhu, Qiuyue Zhao, Yan Liu, Mingzhao Zheng, Xiaolong Li, Ting'an Zhang
Summary: The side-blown vortex smelting reduction reactor is a new type of metal extraction equipment proposed in this paper, and the study of fluid dynamics is significant for improving reactor performance. Physical simulation is used to analyze the effects of various parameters on the reactor characteristics, and dimensional analysis correlates dimensionless numbers with mixing time and multiphase flow behavior, showing certain correlations between the parameters.
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
(2021)
Article
Biotechnology & Applied Microbiology
Guijun Yang, Wenwen Pan, Zheng Rui, Chunni Zhong, Xiangming Tang, Ruipeng Yu, Xiquan Hu
Summary: This study reveals the importance and interaction between hydrodynamic mixing and nutrients in the growth of Microcystis. The results show that the combined effect of hydrodynamic mixing and nutrient addition can promote the abundance and colony size of Microcystis, playing an important role in its dominance in phytoplankton community.
JOURNAL OF APPLIED PHYCOLOGY
(2022)
Article
Energy & Fuels
Jeong-Hwan Kim, Iseul Nam, Sungwoo Kang, Seungmin Jung
Summary: This paper proposes an algorithm that considers the wake effect to achieve flexible control during the actual power curtailment process in a wind farm. The effectiveness of this method is verified through the application of the curtailment communication signal to a real-time digital simulator (RTDS).
Article
Engineering, Mechanical
Kai Yang, Xue Zhang, Meng Li, Qingtai Xiao, Hua Wang
Summary: In this study, a new method is proposed to measure the mixing state quality of gas-liquid two-phase flow stirred by top-blown air using electrical capacitance tomography (ECT)-based visualization experiments. The ECT measurement system successfully visualizes the thermal condition of the flow and accurately estimates the mixing time using chaos detection and logistic regression methods. Experimental and calculated results demonstrate the accuracy of ECT in visualizing the flow pattern and provide theoretical basis for the actual production process.
FLOW MEASUREMENT AND INSTRUMENTATION
(2022)
Article
Computer Science, Information Systems
Runhui He, Bo Xue, Mingde Zhou, Minfan Fu, Junrui Liang, Yu Liu, Haoyu Wang
Summary: To achieve optimal system performance, LLC resonant converters should be operated at their resonant frequency. However, the resonant parameters can deviate significantly in mass production, necessitating active tracking of the resonant frequency. This paper presents a novel control scheme for LLC converters that tracks the resonant frequency using an accurate small-signal model and an extended state observer. The proposed scheme is easier to implement and requires fewer sensors compared to conventional control schemes, as demonstrated by experimental results.
Article
Materials Science, Multidisciplinary
Hongliang Zhao, Jingqi Wang, Fengqin Liu, Hong Yong Sohn
Summary: The distribution of flow zones and mixing time in a Peirce-Smith copper converter was studied, and a dimensionless equation with less than 5% error correlation of stirring and mixing energy was established. It was recommended to improve slag-making reaction by injecting a quartz flux through tuyeres or into the backflow point of the splashing wave through a chute.
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
(2022)
Article
Environmental Sciences
Chuan Huang, Zhongyu Li, Mingyue Lou, Xingye Qiu, Hongyang An, Junjie Wu, Jianyu Yang, Wei Huang
Summary: This paper proposes a long-time optimized integration method to address the power budget limitation from BeiDou satellite for passive radar vessel target detection. By applying the keystone transform, hybrid integration strategy, and particle swarm optimization algorithm, the detection performance is improved significantly.
Article
Engineering, Electrical & Electronic
Bodong Li, Min Chen, Xiaoqing Wang, Ning Chen, Xinnan Sun, Dongbo Zhang
Summary: An accurate time-domain model introduced in this article for the resonant CLLC circuit improves the determination of zero-crossing points of the secondary side resonant current. This model is more accurate and less computationally intensive compared to previous methods, allowing for adaptive generation of SR signals in different frequency ranges and smooth mode switching. The proposed SR method is also analyzed for robustness and validated through a 3-kW resonant CLLC prototype.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Thermodynamics
Erfan Khodabandeh, Omid Ali Akbari, Soheil Akbari, Afshin Taghizadeh, Mohsen Saffari Pour, Mikael Ersson, Par G. Jonsson
Summary: This numerical study investigated the variations in the surface area of cooling channels in a solid oxide fuel cell with different cross sections and multi-walled carbon nanotubes oil/MWCNT nanofluid volume fractions. The research found that increased heat leads to higher heat transfer rates, and the presence of solid particles can improve heat transfer performance. Pumping power is influenced by mass flow rates and solid nanoparticle volume fractions, while lower mass flow rates can result in increased temperatures in the fuel cell.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Editorial Material
Materials Science, Multidisciplinary
Yu Liu, Mikael Ersson, Heping Liu, Par Goran Jonsson, Yong Gan
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
(2020)
Article
Metallurgy & Metallurgical Engineering
Yonggui Xu, Mikael Ersson, Par G. Jonsson
STEEL RESEARCH INTERNATIONAL
(2020)
Article
Metallurgy & Metallurgical Engineering
Jonas L. Svantesson, Bjorn Glaser, Mikael Ersson, Jesse F. White, Matej Imris, Par G. Jonsson
Summary: The study investigated the wear of industrial refractory materials in contact with slag containing high amounts of FeO using the rotating finger technique. Thermodynamic equilibrium of refractory slag systems was determined in Thermo-calc(R) and FactSage (TM). Only MgO-spinel refractories exhibited resistance to the slag, with thermodynamic equilibrium calculations able to predict experimental behavior.
IRONMAKING & STEELMAKING
(2021)
Article
Chemistry, Physical
Jonas L. Svantesson, Mikael Ersson, Par G. Jonsson
Summary: The study investigated the flow behavior of gas in compressible and incompressible systems, verifying simulation results with experiments and establishing empirical equations for reliable predictions. It was found that the gas blowing required a lower modified Froude number to produce a jetting behavior, impacting the penetration length prediction.
Article
Metallurgy & Metallurgical Engineering
Jun Yin, Mikael Ersson, Alberto N. Conejo, Nils Andersson, Par G. Jonsson
Summary: By studying different tilting angles, it can be determined that using a 90-degree tilting angle is an effective way to reduce the number of inclusions generated by mold flux entrapments and refractory wear.
STEEL RESEARCH INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Xiaobin Zhou, Qiang Yue, Zhanxia Di, Dongyuan Sheng, Mikael Ersson
Summary: This study focuses on cavity formation induced by jet impingement through numerical simulations and theoretical equations. Results show that for subsonic jet flow, cavity depth decreases with increasing blowing height while diameter increases. Moreover, larger nozzle diameter results in deeper cavities due to weaker jet flow attenuation. The developed model is also capable of describing cavity formation under supersonic flow conditions.
Review
Metallurgy & Metallurgical Engineering
Qinghua Xie, Muhammad Nabeel, Mikael Ersson, Peiyuan Ni
Summary: Swirling flow casting technology is essential in steel production to optimize steel flow and improve solidification process, offering promising potential for further development and usage in the industry.
STEEL RESEARCH INTERNATIONAL
(2022)
Article
Metallurgy & Metallurgical Engineering
Serg Chanouian, Bjorn Ahlin, Anders Tilliander, Mikael Ersson
Summary: Small-scale physical models are commonly used to investigate gas-stirred processes in steelmaking practice. This study investigates the effect of converter inclination on mixing time and jet-penetration length. The results show that the penetration length is independent of inclination angle, while the mixing time is influenced by various factors such as bath height to diameter ratio and gas flow rate.
STEEL RESEARCH INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Qinghua Xie, Peiyuan Ni, Mikael Ersson, Par Goran Jonsson, Ying Li
Summary: Swirling flow generator (SFG) designs significantly suppress impinging flow and create periodic flow characteristics in a round mold. The velocity fluctuation period and range in the submerged entry nozzle depend on SFG inlet area and velocity. The use of SFG designs reduces steel super-heat, improves temperature distribution, but lowers inclusion removal ratio.
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
(2022)
Article
Metallurgy & Metallurgical Engineering
Serg Chanouian, Bjorn Ahlin, Anders Tilliander, Mikael Ersson
Summary: Metallurgical converters like the AOD converter are used for mixing and refining liquid steel. Stirring is commonly studied through physical and numerical models due to the harsh and opaque environment. Effective stirring is important for processes like decarburization, but the role of high-temperature chemical reactions is not well-explored. This study investigates the chemical reactions of a single gas bubble in the AOD using a computational fluid dynamics model coupled with chemical reactions.
STEEL RESEARCH INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Xiaobin Zhou, Yu Zhang, Qingling He, Peiyuan Ni, Qiang Yue, Mikael Ersson
Summary: Mixing plays a crucial role in various vessels, but the mixing time obtained from a few monitor locations cannot represent the whole bath. This study proposes a novel approach using a mathematical model to quantify the mixing time evaluation considering the tracer variation for the entire bath.
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Jiahao Wang, Peiyuan Ni, Chao Chen, Mikael Ersson, Ying Li
Summary: A three-dimensional mathematical model was developed to investigate the effect of gas blowing nozzle angles on multiphase flow, circulation flow rate, and mixing time during the RH refining process. Measurements carried out on a scaled water model validated the mathematical model. The results showed good agreement between the predicted and measured values for mixing time, with deviations ranging from 1.3% to 7.3%. When the gas blowing nozzle was horizontally rotated by 30 or 45 degrees, the circulation flow rate increased by 15% and the mixing time at different monitoring points decreased by 21.3%, 28.2%, and 12.3% respectively. The residence time of 128 bubbles in liquid increased by 33.3% with nozzle angles of 30 and 45 degrees.
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
(2023)
Article
Metallurgy & Metallurgical Engineering
Qing-hua Xie, Pei-yuan Ni, Toshihiro Tanaka, Mikael Ersson, Ying Li
Summary: Investigations were conducted to study the flow field, heat transfer, and inclusion behavior in a 700 mm round bloom mold using a swirling flow submerged entry nozzle (SEN). The results showed that the impinging flow phenomenon commonly observed in conventional single-port SEN casting was suppressed by the swirling flow SEN. The temperature distribution in the mold became more uniform, with a decrease in steel super-heat at the mold center and an increase near the meniscus. Furthermore, the removal ratio of inclusions to the mold top surface was increased in the swirling flow SEN casting.
JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
(2023)
Article
Metallurgy & Metallurgical Engineering
Jiahao Wang, Peiyuan Ni, Xiaobin Zhou, Qilin Liu, Mikael Ersson, Ying Li
Summary: By using nonradial gas-injection nozzles in the up-snorkel, an upward spiral steel flow is produced, which improves the 260 ton RH refining process. Compared to the conventional case, this improvement increases the circulation flow rate by about 18.0%, shortens the mixing time by about 26.2%, and enhances the inclusion removal rate for different inclusion sizes.
STEEL RESEARCH INTERNATIONAL
(2023)
