Article
Engineering, Chemical
Ze Zhang, Shuting Zhang
Summary: The chemical agglomeration technology effectively removes fine particles during coking coal loading and unloading, reducing the average concentration in the end. The soap solution has a strong agglomeration effect on particles smaller than 0.5 mm, increasing the coating efficiency of fine particles.
Article
Engineering, Chemical
Jia'nan Wang, Wenjun Huang, Haomiao Xu, Zan Qu, Jinping Jia, Naiqiang Yan
Summary: A novel system combining corona discharge and embedded turbulence was proposed to agglomerate fine particles into bigger ones for better capture efficiency. Experimental results showed significant improvements in number concentration and diameter of small particles under specific conditions.
Article
Energy & Fuels
Hexin Liu, Zhenghong Li, Houzhang Tan, Fuxin Yang, Peng Feng, Yongle Du, Ming Ren, Ming Dong
Summary: The novel agglomerator combining various technologies shows high efficiency in controlling and removing fine particles, as demonstrated by experimental results. By optimizing two key parameters, atomization quantity and inlet flue gas velocity, the agglomeration effect can be further improved.
Article
Chemistry, Multidisciplinary
Jae Won Lee, Sungwoo Jung, Jinhyeong Jo, Gi Hyeon Han, Dong-Min Lee, Jiyeon Oh, Hee Jae Hwang, Dukhyun Choi, Sang-Woo Kim, Jun Hee Lee, Changduk Yang, Jeong Min Baik
Summary: In this paper, a new dielectric material, a C-60-containing block polyimide (PI-b-C-60), was reported for use in a non-contact mode triboelectric nanogenerator (TENG). The TENG based on PI-b-C-60 achieved high output power and reliable operation, outperforming perfluoroalkoxy alkane film-based TENGs. The excellent charge-retention characteristics of PI-b-C-60, induced by the most negative electrostatic potential of C-60 within the backbone, were confirmed by surface potential measurements. Additionally, two non-contact mode applications, a keyless electronic door lock system and a speed sensor with a tone wheel for a car, were successfully developed during the study.
ENERGY & ENVIRONMENTAL SCIENCE
(2021)
Article
Green & Sustainable Science & Technology
Yumeng Zhang, Xianying Chen, Di Wei, Kejun Dong, Bo Wang
Summary: This study measured the flow field and particles in an agglomeration chamber using a phase doppler particle analyzer and found that bluff bodies can significantly improve the agglomeration of fine particles. Different shaped bluff bodies were considered, and low-velocity recirculation regions and vortex flow with special structures were observed. The flow field generated by a single bluff body effectively caused an increase in particle size and a decrease in particle number. The findings provide new insights into particle agglomeration separation for this environment-friendly and low-cost technology.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Chemistry, Physical
Jing Zhong Kuang, Yiqiang Yang, Zhilei Zou, Weiquan Yuan, Zheyu Huang, Hao Cheng
Summary: This study investigated the effects of metal ion species, valence state, and pH on the dispersion and agglomeration behavior of microfine particles of wolframite. The results showed that divalent and trivalent metal ions significantly affected the agglomeration behavior of the particles compared to monovalent metal ions. Under specific pH conditions, divalent and trivalent metal ions destabilized and agglomerated the particles.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Chemistry, Applied
Lei Zhou, Jiefei Zhang, Xiangning Liu, Hao Wu, Qian Guan, Guisheng Zeng, Linjun Yang
Summary: Fine particles emitted from coal-fired power plants are a major contributor to air pollution and health issues in China. Chemical agglomeration technology, which promotes the formation of larger particle aggregates, can improve the capture of fine particles by electrostatic precipitators. Experimental results showed that the addition of sesbania gum and styrene-butadiene emulsion significantly increased the concentration and particle size of fly ash particles, leading to higher dust removal efficiency. Furthermore, the use of a surfactant called T-100 further improved the removal efficiency and wetting performance.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Energy & Fuels
Jianan Wang, Wenjun Huang, Haomiao Xu, Hongbin Wang, Yuchen Ding, Zan Qu, Naiqiang Yan
Summary: This study investigates the agglomeration of fine particles and its underlying mechanisms in different electric fields. The results show that under the coupling effect of turbulence and cross discharge electrode, the removal efficiency of fine particles can reach nearly 80% and the particle size can be increased by 30%. The electric field intensity with cross electrode is higher than conventional electrodes, and the residence time of fine particle in the electric field with cross electrodes is longer and the movements are more disordered, allowing for more charge accumulation and coagulation opportunities.
Article
Engineering, Chemical
Jia 'nan Wang, Wei Liu, Fubing Zhang, Wenjun Huang, Haomiao Xu, Yuchen Ding, Zan Qu, Naiqiang Yan
Summary: Agglomeration pretreatment is the most effective method to remove fine particulate matters (PM2.5). However, existing technologies were not suitable for high-humidity conditions. This study proposed a method combining spraying and turbulence effects to enhance the agglomeration of fine particles. The results showed that the number concentration proportions of fine particles can decrease and increase within specific size ranges with the spray volume of 15 L/min. Turbulence effects can increase the collision and agglomeration opportunities among particles and droplets, resulting in an increased average particle size. The integration of this method with an agglomeration system can improve the removal efficiency of fine particles in WESP. This study contributes to understanding the mechanism of turbulence on particle agglomeration and provides insights for upgrading existing dust removal equipment.
Article
Biochemistry & Molecular Biology
Zhongyi Liu, Jie Liu, Yinfei Liao, Chenxi Jin, Zilong Ma
Summary: In this study, the effect of Ca2+ on the dispersion behavior of fine smithsonite was investigated. It was found that the presence of calcium ions reduced the dispersion behavior of smithsonite, particularly at pH > 10. The adsorption of calcium ions on the smithsonite surface may have caused ion exchange or the generation of calcium hydroxide precipitation, resulting in particle coalescence behavior.
Article
Materials Science, Paper & Wood
Zhang Sheng, Zhu Qiuxiao, Wang Tingting, Wang Xuchong, Sun Xiaoping, Wei Yuhe, Luo Lianxin
Summary: In this study, epoxy chloropropane and ethylenediamine were grafted onto cellulose fibers to improve their contact electrification performance in friction triboelectric nanogenerators (TENGs). Adding nano TiO2 filler further increased the output performance of TENG. The TENG's performance was also maintained under different air humidities.
Article
Engineering, Chemical
J. Nicklas, U. A. Peuker
Summary: The agglomeration dynamics of small alumina particles with a wetting angle of 134 degrees were studied in a baffled stirred tank using dynamic image analysis with an in-line camera probe. The analysis allowed for a multidimensional characterization of particle properties during the agglomeration process and revealed a bimodal particle size distribution with nonagglomerated primary particles and smaller agglomerates. Fraction determination of agglomerates and primary particles can be approximated using mixture models based on 1D size or 2D size-aspect ratio data.
Article
Construction & Building Technology
Pranav Muthukrishnan, Faramarz Farahi
Summary: As we spend the majority of our time indoors, it is crucial to improve indoor air quality in order to reduce the spreading and impact of respiratory diseases and other health issues caused by particle pollution. The current primary methods of cleaning indoor air involve using better filters or increasing ventilation with outdoor air. However, ionization can be implemented as an effective supplement to these approaches. Our study showed that ionization significantly increased the removal efficiency of fine and ultrafine particles in indoor environments. This highlights the potential of ionization in improving indoor air quality.
Article
Chemistry, Physical
Xuejie Bai, Hua Wei, Tian Qiu, Zhenxing Zhang, Yaqun He, Haifeng Wang
Summary: Triboelectric charging is a complex process where the charge sign may reverse due to slight changes in contact surface properties. Experimental results show that increasing applied force at the tip-sample interface enhances the charge transfer process, but excessive force can lead to tip damage and sample deformation. Ethanol/acetone rinsed SiO2 surfaces acquire negative charges when in contact with an original tip, while damaged tips result in positive charges. Additionally, ultrasonication can further enhance charge transfer at the tip-sample interface.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Engineering, Chemical
Zhen Tan, Libin Zhang, Zhonghua Yu
Summary: The complex electrification mechanism during particle fluidization requires a reliable contact electrification model that addresses issues such as charging efficiency and the critical gap for electron tunnelling. This study develops a contact electrification model based on the condenser model, focusing on the simplest normal contact electrification between insulator particles and metal surfaces. By analyzing the impact of initial charge and impact velocity on transferred charge, the model accurately predicts electrification during the collision of insulator particles on metal surfaces. Experimental validation demonstrates the effectiveness of the model.
Article
Engineering, Chemical
Yongxiang Wu, Nguyen Thi Hong Nhung, Deqian Zeng, Nengneng Luo, Akira Otsuki, Gjergj Dodbiba, Toyohisa Fujita
Summary: This study proposed a novel method for synthesizing flower-like vaterite calcium carbonate using nanobubble-containing ethanol and water mixed solution as the solvent and discussed the formation mechanism of vaterite with different shapes. The synthesized vaterite has significant practical interest in the integrated treatment of wastewater contaminated by heavy metals with effective Cd(II) removal, providing a promising field for studying heavy metal and pollutant adsorption in the liquid phase.
ADVANCED POWDER TECHNOLOGY
(2024)
Article
Engineering, Chemical
Jian Gong, Lipo Cheng, Ming Liu, Jie Jiang, Xiaoduo Ou
Summary: This study investigates the effects of particle shape on the collapse of granular columns using the discrete element method. The results show that particle shape has a significant impact on deposition morphology, energy evolution, and mechanical coordination number. Sphericity and angularity are identified as the most important macroscale factors, while roughness has a weaker microscale influence.
ADVANCED POWDER TECHNOLOGY
(2024)
