Article
Metallurgy & Metallurgical Engineering
Ri-jin Cheng, Hua Zhang, Yang Li, Qing Fang, Bao Wang, Hong-wei Ni
Summary: Dry centrifugal granulation method can granulate blast furnace slag, but the granulation results are easily affected by parameters such as slag flow rate, disk rotating speed, and material. The optimal parameters can produce round particles with a diameter of 3.43 mm.
JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Ming Zhao, Yuhua Pan, Aifu Zhao, Shili Zhang, Ping Ma, Xin Feng
Summary: In this study, a three-dimensional CFD model was established to simulate the breakup of a single water ligament into droplets and compared with the breakup process of a molten slag ligament due to centrifugal force. The results show that the behavior of molten slag ligament breakup is very similar to that of water or liquid paraffin ligaments and both follow the Rayleigh Disintegration Mechanism. This provides a theoretical basis for analyzing the breakup process of different liquid ligaments and guiding the centrifugal granulation of molten slag.
Article
Green & Sustainable Science & Technology
Ningwen Xu, Jun Zhao, Xi Zhang, Meiquan Li, Chen Ma, Zhiqiang Wu, Haiyu Meng, Shuzhong Wang
Summary: This paper conducted a numerical simulation to analyze the spreading characteristics of liquid film in the process of waste heat recovery. The results showed that parameters such as rotation speed, slag flow rate, and slag temperature had a significant influence on the thickness of the liquid film.
JOURNAL OF SUSTAINABLE METALLURGY
(2022)
Article
Engineering, Chemical
Yu Tan, Bin Ding, Jun Shi, Hui Yan, Yingchun Wu, Junjun Wu
Summary: This study successfully simulated the granulation process of centrifugal particulate materials at large flow rates by establishing an improved model, and film fragmentation was reproduced for the first time. The film fragmentation mechanism under different operational conditions was investigated by quantifying the characteristics of the off-atomizer film. This study provides an important computational fluid dynamics model for studying the underlying physics of film fragmentation, and opens up new possibilities for predicting droplet formation of materials under experimentally unavailable conditions.
Article
Thermodynamics
Meiquan Li, Jun Zhao, Xi Zhang, Ningwen Xu, Haiyu Meng, Zhiqiang Wu, Shuzhong Wang
Summary: The inclination of the inner wall surface of the rotating cup can strengthen the granulation effect within the range of 0-45 degrees. To ensure proper granulation, the ratio of the diameter of the slag tube to the rotating cup should not exceed 0.44, and the height of the slag tube should be as close as possible to the granulator. Additionally, keeping the slag eccentricity within 5% ensures uniform particle size after granulation.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Lili Wang, Yuzhu Zhang, Haibin Ke, Yue Long
Summary: The gas quenching dry slag granulation technique is effective in efficient waste heat recovery, with smaller particle diameter and lower fiber mass fraction contributing to higher recovery rates. High temperature experiments showed the significant impact of airflow velocity and molten slag mass flow rate on granulation characteristics.
APPLIED THERMAL ENGINEERING
(2021)
Article
Engineering, Chemical
Zhongyuan Liu, Qingbo Yu, Weidong Ma, Junxiang Liu, Shengkai Tao
Summary: Centrifugal granulation with waste recovery was proposed to recover waste heat from molten yellow phosphorus slag produced by an electric arc furnace and reduce pollution. The study investigated the effect of operating parameters on particle diameter distribution, flight distance distribution, and fiber mass fraction during the granulation process. The results showed that the average diameter was mainly 1.5-3 mm and obeyed a log-normal distribution. Increasing the rotating speed and the rotary cup diameter dispersed the average flight distance and the distribution of flight distance. Increasing slag temperature, mass flow rate, and decreasing rotary cup diameter can reduce the fiber mass fraction.
CHEMICAL ENGINEERING RESEARCH & DESIGN
(2023)
Article
Thermodynamics
Huining Zhang, Jianping Dong, Chao Wei, Caifang Cao, Zuotai Zhang
Summary: The integration consideration of end-point reproductions like molten slag waste heat recovery and resourceful disposal plays a significant role in establishing an economical and environmental circular network system for wastes. The review discusses the limitations and priorities of prevailing heat recovery processes, such as physical or chemical methods, and proposes a collaborative approach combining physical and chemical methods for efficient energy recovery. Additionally, a cleaner routine of molten slag-waste plastics system is proposed for triple targets of carbon dioxide storage, energy conservation, and establishing an economical and environmental circular network system in steelmaking plants.
Article
Chemistry, Analytical
Yan-Hui Feng, Zhen Zhang, Jie Gao, Guang-Peng Feng, Lin Qiu, Dai-Li Feng, Xin-Xin Zhang, Xun Zhu
Summary: This paper discusses the importance of heat recovery and resource utilization of molten blast furnace slags in industrial energy saving and emission reduction, as well as the advantages and related mechanisms of centrifugal granulation technology. It focuses on factors such as liquid film thickness, ligament number, and droplet diameter in the centrifugal granulation process, and emphasizes the influence of slag particle solidification and phase change on further utilization in the physical waste heat recovery process.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2021)
Article
Materials Science, Multidisciplinary
Zhongfu Cheng, Abdul Khaliq, Bart Blanpain, Muxing Guo
Summary: The influence of process parameters on the kinetics of Zn fuming from a fayalite-based slag through stirring with air-CH4 gas mixtures has been studied. A kinetic model of the fuming process is developed, and the mass transfer coefficient k(l)a is obtained and used to understand the gas flow rate effect on the fuming kinetics.
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
(2022)
Article
Geochemistry & Geophysics
Aifu Zhao, Yuhua Pan, Ming Zhao, Shili Zhang, Ping Ma, Xin Feng
Summary: In this study, a three-dimensional transient computational fluid dynamics (CFD) model was used to investigate the breakup process of molten blast furnace slag ligaments into droplets by centrifugal granulation with a spinning cup. The simulations revealed the formation of slag ligaments at the cup edge and their subsequent disintegration into droplets. The results showed that increasing the cup spinning speed led to a decrease in slag film thickness, an increase in the number of ligaments, and a reduction in ligament diameter, resulting in smaller droplets. Additionally, the increased spinning speed also caused a decrease in ligament length due to the reduced flow rate of a single ligament. Furthermore, the behavior and mechanism of a single ligament breakup into droplets were investigated, and it was found that the process could be approximately explained by the Rayleigh disintegration mechanism.
Article
Metallurgy & Metallurgical Engineering
Li-li Wang, Yu-zhu Zhang, Yue Long
Summary: The dry slag granulation technique breaks up molten slag into droplets using supersonic air, impacting droplet diameter and waste heat recovery. Numerical simulation reveals a process involving film formation, wave appearance, and vortex structure generation.
JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
(2021)
Article
Engineering, Chemical
Kangle Zhu, Yunzhong Liu, Zhenhua Fan
Summary: Rotating-disk centrifugal atomization is an effective technique for breaking up highly viscous liquid into droplets with a narrow size distribution. However, the dispersed spray fields and high initial velocities limit its application in directional spray and increase costs. A novel atomization technique that controls the spray field by regulating rotational-induced airflow is proposed, leading to more efficient and cost-effective control. The influence of rotation-induced airflow on atomized droplets was investigated using different experimental and numerical methods, revealing the presence of symmetric and asymmetric flow patterns.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Engineering, Chemical
Kshetramohan Sahoo, Sanjeev Kumar
Summary: By using high-speed imaging, the process of drops releasing from a perfectly wetted disc at low inflow rates is observed. The shape of the drops varies significantly over time under fixed conditions, but can be unified into a single curve when time is scaled. The measurements show a universal drop release process that is independent of disc speed.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Materials Science, Multidisciplinary
M. Meratian, A. Asgarian, A. Vadillo, K. Chattopadhyay, M. Barati
Summary: A mathematical model was developed to control the particle size of slag powder particles in the air atomization process, aiming for different industrial applications. This model provides a universal approach for gas-liquid combinations with good agreement with experimental results.
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
(2021)
