Pub Date : 2025-01-07DOI: 10.1016/j.powtec.2025.120630
Tian-sheng Liu , Tian-Li Bo
In this paper, a charging property measurement system for dust particles is developed that can reflect the particle collision process during real dust events. The experimental results show that with the increase of the incident velocity (vimp) of the impact particles and the particle size ratio (λ), the charge-to-mass ratio (q) of the impacted particle decreases. Upon comparing our results with existing experimental data, we observed that when the impacted particle is constrained, there is a possibility that the particle's q may be underestimated, and furthermore, there exists a qualitative difference in how q varies with the impact velocity (vimp). Based on the capacitor model, this paper presents a charge model of dust particles considering the vimp and λ. The representation equation of the parameter KQ in the model is determined based on the experimental data using the least squares method, indicating that its representation reflects the influence of both vimp and λ. Moreover, KQ dominates the influence of vimp on the q. The prediction results of the model are in good agreement with the experimental results.
{"title":"Experimental study on the charging process of dust particles","authors":"Tian-sheng Liu , Tian-Li Bo","doi":"10.1016/j.powtec.2025.120630","DOIUrl":"10.1016/j.powtec.2025.120630","url":null,"abstract":"<div><div>In this paper, a charging property measurement system for dust particles is developed that can reflect the particle collision process during real dust events. The experimental results show that with the increase of the incident velocity (<em>v</em><sub><em>imp</em></sub>) of the impact particles and the particle size ratio (λ), the charge-to-mass ratio (<em>q</em>) of the impacted particle decreases. Upon comparing our results with existing experimental data, we observed that when the impacted particle is constrained, there is a possibility that the particle's <em>q</em> may be underestimated, and furthermore, there exists a qualitative difference in how <em>q</em> varies with the impact velocity (<em>v</em><sub><em>imp</em></sub>). Based on the capacitor model, this paper presents a charge model of dust particles considering the <em>v</em><sub><em>imp</em></sub> and λ. The representation equation of the parameter <em>K</em><sub><em>Q</em></sub> in the model is determined based on the experimental data using the least squares method, indicating that its representation reflects the influence of both <em>v</em><sub><em>imp</em></sub> and λ. Moreover, <em>K</em><sub><em>Q</em></sub> dominates the influence of <em>v</em><sub><em>imp</em></sub> on the <em>q</em>. The prediction results of the model are in good agreement with the experimental results.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"453 ","pages":"Article 120630"},"PeriodicalIF":4.5,"publicationDate":"2025-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143100443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-06DOI: 10.1016/j.powtec.2025.120625
Shijie Yu , Haishen Jiang , Ran Yang , Yuhan Liu , Xinhao Li , Shijun Li , Peng Guo , Long Huang , Yulong Zhang , Chenlong Duan , Haoran Song
In order to increase the vibration intensity of the screen surface and enhance the 1 mm elastic screening efficiency, a 1-mm complex additional excitation elastic screen surface was proposed. Through vibration tests, the kinematic characteristics of the complex additional excitation elastic screen surface at different operating stages are analyzed, the kinematic trajectory is reconstructed, and the influences of different parameters on the screen surface kinematic characteristics are explored. The screen surface undergoes large deformation, with the maximum average amplitude value in the x and z directions being 6.29 mm and 14.94 mm, respectively. The influences of different parameters on the elastic screening effect are assessed. With the increase of the excitation direction angle, total excitation force and excitation frequency, the screening efficiency firstly increased and then decreased. The order of significance obtained by response surface experiment is as follows: F > f > Ѱ. The actual screening efficiency was 79.47 %, and the total misplaced materials was 3.89 % under the optimal operating conditions.
{"title":"Research on the optimization of parameters of 1 mm elastic screening process with complex additional excitation","authors":"Shijie Yu , Haishen Jiang , Ran Yang , Yuhan Liu , Xinhao Li , Shijun Li , Peng Guo , Long Huang , Yulong Zhang , Chenlong Duan , Haoran Song","doi":"10.1016/j.powtec.2025.120625","DOIUrl":"10.1016/j.powtec.2025.120625","url":null,"abstract":"<div><div>In order to increase the vibration intensity of the screen surface and enhance the 1 mm elastic screening efficiency, a 1-mm complex additional excitation elastic screen surface was proposed. Through vibration tests, the kinematic characteristics of the complex additional excitation elastic screen surface at different operating stages are analyzed, the kinematic trajectory is reconstructed, and the influences of different parameters on the screen surface kinematic characteristics are explored. The screen surface undergoes large deformation, with the maximum average amplitude value in the <em>x</em> and <em>z</em> directions being 6.29 mm and 14.94 mm, respectively. The influences of different parameters on the elastic screening effect are assessed. With the increase of the excitation direction angle, total excitation force and excitation frequency, the screening efficiency firstly increased and then decreased. The order of significance obtained by response surface experiment is as follows: <em>F > f > Ѱ.</em> The actual screening efficiency was 79.47 %, and the total misplaced materials was 3.89 % under the optimal operating conditions.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"454 ","pages":"Article 120625"},"PeriodicalIF":4.5,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143104250","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-06DOI: 10.1016/j.powtec.2025.120623
Gaofeng Chen , Jianming Gao , Cheng Liu , Shujun Li , Yasong Zhao , Huixia Wu , Zhaoheng Guo , Xu Luo , Qiang Liu , Xuemei Chen
This study investigated the effect of waste clay brick powder (WCBP) and slag on mechanical properties and durability of concrete. A comprehensive assessment was conducted, encompassing axial compressive strength, flexural strength, uniaxial stress-strain behavior, carbonation, and sulfate attack, as well as hydration characteristic. The results reveal that samples with WCBP and slag exhibit lower portlandite content and an optimized pore structure. The combination of WCBP and slag has a synergistic improvement effect on the strength of WCBP concrete. Moreover, the stress-strain curve trends for concrete containing WCBP and slag resemble those of control concrete. Notably, WCBP possesses the potential to reduce concrete brittleness and improve sulfate attack resistance. While incorporating WCBP and slag reduces the carbonation resistance of concrete, prolonging the initial curing time can effectively improve this. These findings provide valuable insights for high-quality utilization of WCBP to reduce construction and demolition waste.
{"title":"Effect of waste clay brick powder and slag on mechanical properties and durability of concrete","authors":"Gaofeng Chen , Jianming Gao , Cheng Liu , Shujun Li , Yasong Zhao , Huixia Wu , Zhaoheng Guo , Xu Luo , Qiang Liu , Xuemei Chen","doi":"10.1016/j.powtec.2025.120623","DOIUrl":"10.1016/j.powtec.2025.120623","url":null,"abstract":"<div><div>This study investigated the effect of waste clay brick powder (WCBP) and slag on mechanical properties and durability of concrete. A comprehensive assessment was conducted, encompassing axial compressive strength, flexural strength, uniaxial stress-strain behavior, carbonation, and sulfate attack, as well as hydration characteristic. The results reveal that samples with WCBP and slag exhibit lower portlandite content and an optimized pore structure. The combination of WCBP and slag has a synergistic improvement effect on the strength of WCBP concrete. Moreover, the stress-strain curve trends for concrete containing WCBP and slag resemble those of control concrete. Notably, WCBP possesses the potential to reduce concrete brittleness and improve sulfate attack resistance. While incorporating WCBP and slag reduces the carbonation resistance of concrete, prolonging the initial curing time can effectively improve this. These findings provide valuable insights for high-quality utilization of WCBP to reduce construction and demolition waste.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"453 ","pages":"Article 120623"},"PeriodicalIF":4.5,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143156146","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-06DOI: 10.1016/j.powtec.2025.120628
Tao Wang , Wei Zhou , Zilei Wang , Long Li
This paper details the design concept of a jet and stirring synergistic flotation column; it conducts a simulation study of the internal flow field using the two-phase flow module and particle tracking module in COMSOL software; and it establishes a 15-l jet and stirring synergistic flotation column for experimental research. The results show that in the jet-stirring coupling structure of the device, the flow field exhibits high turbulent kinetic energy and turbulence dissipation rate, which facilitates collision and mixing in the three-phase system. The device modifies coal slurry particles, increasing the slurry contact angle and enhancing the hydrophobicity of the particles. The speed distribution of the flow field, gas distribution, and particle distribution within the column are reasonable. The uniformity coefficient of aeration within the column reaches 96.10 %, and the solid-liquid ratio at sampling points on different height planes is similar, with no dead zones or particle accumulation. The flotation column with jet and stirring synergy exhibits good flotation performance, with the recovery rate reaching its maximum after 1 min, the flotation yield reaching 53.96 % within 5 min, and the ash content of the flotation clean coal stabilizing at 11.29 %, qualifying as high-quality flotation clean coal. The device shows good adaptability and demonstrates good flotation performance under conditions of low air intake. This study provides a new technical solution for efficiently separating fine-grained minerals, holds potential for further industrial development, and has positive significance for the R&D of flotation equipment and three-phase mixing devices.
{"title":"Investigation of a jet and stirring synergistic flotation column combining two-phase flow and particle tracking simulation methods with experiments","authors":"Tao Wang , Wei Zhou , Zilei Wang , Long Li","doi":"10.1016/j.powtec.2025.120628","DOIUrl":"10.1016/j.powtec.2025.120628","url":null,"abstract":"<div><div>This paper details the design concept of a jet and stirring synergistic flotation column; it conducts a simulation study of the internal flow field using the two-phase flow module and particle tracking module in COMSOL software; and it establishes a 15-l jet and stirring synergistic flotation column for experimental research. The results show that in the jet-stirring coupling structure of the device, the flow field exhibits high turbulent kinetic energy and turbulence dissipation rate, which facilitates collision and mixing in the three-phase system. The device modifies coal slurry particles, increasing the slurry contact angle and enhancing the hydrophobicity of the particles. The speed distribution of the flow field, gas distribution, and particle distribution within the column are reasonable. The uniformity coefficient of aeration within the column reaches 96.10 %, and the solid-liquid ratio at sampling points on different height planes is similar, with no dead zones or particle accumulation. The flotation column with jet and stirring synergy exhibits good flotation performance, with the recovery rate reaching its maximum after 1 min, the flotation yield reaching 53.96 % within 5 min, and the ash content of the flotation clean coal stabilizing at 11.29 %, qualifying as high-quality flotation clean coal. The device shows good adaptability and demonstrates good flotation performance under conditions of low air intake. This study provides a new technical solution for efficiently separating fine-grained minerals, holds potential for further industrial development, and has positive significance for the R&D of flotation equipment and three-phase mixing devices.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"453 ","pages":"Article 120628"},"PeriodicalIF":4.5,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143156145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-06DOI: 10.1016/j.powtec.2025.120621
Alireza Bahramian , Martin Olazar
Understanding the agglomeration characteristics of nanoparticles (NPs) helps to improve their fluidization quality. This study aims to ascertain the multi-stage agglomeration of titania NPs in a conical fluidized bed. Fluidization experiments were performed to identify the temporal variation of particle size distribution and pressure fluctuations in different bed zones. A model was built by coupling computational fluid dynamics and discrete element method to ascertain the agglomerate characteristics that could not be identified by experiments. The results showed that the type of flow regime and position of particles in the radial direction have a significant impact on the agglomerate size, particle collision, and therefore bed pressure fluctuations. Primary types of simple-agglomerates (∼25–75 μm) and complex-agglomerates (∼100–150 μm) were mainly detected in the spout and annular zones, respectively. In full fluidization, a continuous break-up of primary complex-agglomerates into secondary simple-agglomerates (∼75–100 μm in size), and re-agglomeration of secondary simple-agglomerates into secondary complex-agglomerates (∼150–200 μm in size) occurred mainly in the annular and spout zones, respectively. In the heterogeneous fluidization, primary types of agglomerates were primarily detected in the spout zone and spout-annulus interface. The highest and lowest pressure fluctuations were obtained in the spout and annular zones, respectively, which was attributed to the effect of particle agglomeration. An increase in the particle cohesion force led to an increase in the probability of complex-agglomerates, as well as a notable deterioration in particle mixing. The effect of particle collision and deagglomeration on particle mixing was much more severe in the annular zone than in both the spout zone and the spout-annulus interface. Inelastic collisions between complex-agglomerates in the annular zone induce a loss in the kinetic energy and granular temperature, with this energy being enough to form secondary-agglomerates, but not enough to break them up, thereby postponing particle mixing.
{"title":"Multi-stage agglomeration phenomena and properties of titania nanoparticle agglomerates in a lab-scale conical fluidized bed: Evaluation of CFD-DEM simulation by laser-based planar imaging and pressure fluctuation analysis","authors":"Alireza Bahramian , Martin Olazar","doi":"10.1016/j.powtec.2025.120621","DOIUrl":"10.1016/j.powtec.2025.120621","url":null,"abstract":"<div><div>Understanding the agglomeration characteristics of nanoparticles (NPs) helps to improve their fluidization quality. This study aims to ascertain the multi-stage agglomeration of titania NPs in a conical fluidized bed. Fluidization experiments were performed to identify the temporal variation of particle size distribution and pressure fluctuations in different bed zones. A model was built by coupling computational fluid dynamics and discrete element method to ascertain the agglomerate characteristics that could not be identified by experiments. The results showed that the type of flow regime and position of particles in the radial direction have a significant impact on the agglomerate size, particle collision, and therefore bed pressure fluctuations. Primary types of simple-agglomerates (∼25–75 μm) and complex-agglomerates (∼100–150 μm) were mainly detected in the spout and annular zones, respectively. In full fluidization, a continuous break-up of primary complex-agglomerates into secondary simple-agglomerates (∼75–100 μm in size), and re-agglomeration of secondary simple-agglomerates into secondary complex-agglomerates (∼150–200 μm in size) occurred mainly in the annular and spout zones, respectively. In the heterogeneous fluidization, primary types of agglomerates were primarily detected in the spout zone and spout-annulus interface. The highest and lowest pressure fluctuations were obtained in the spout and annular zones, respectively, which was attributed to the effect of particle agglomeration. An increase in the particle cohesion force led to an increase in the probability of complex-agglomerates, as well as a notable deterioration in particle mixing. The effect of particle collision and deagglomeration on particle mixing was much more severe in the annular zone than in both the spout zone and the spout-annulus interface. Inelastic collisions between complex-agglomerates in the annular zone induce a loss in the kinetic energy and granular temperature, with this energy being enough to form secondary-agglomerates, but not enough to break them up, thereby postponing particle mixing.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"453 ","pages":"Article 120621"},"PeriodicalIF":4.5,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143156151","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-06DOI: 10.1016/j.powtec.2024.120590
Jacob O. Wilson , Changmin Son , James Loebig , Rui Qiao
The impact of irregular micro-particles against ductile substrates is ubiquitous in engineering equipment, and predicting their rebound through reduced-order models is often necessary. Poor understanding of how non-spherical geometry influences rebound behavior – especially in the regime of finite plastic deformation of the substrate – greatly limits the utility of existing rebound models. Here, high-fidelity impact simulations are leveraged to extract the key features that emerge from irregular, fully resolved sand particle geometries and to identify the physical mechanisms driving them. We show that energy partitioning throughout the impact process differs fundamentally between the spherical and irregular sand particle geometries considered. Because of its relationship with rotation induced during impact, the normalized moment arm parameterization of global particle mass distribution is found to be highly effective in capturing these differences. Finer details of particle shape governing local contact geometry, e.g., local angularity, are argued to be of secondary importance.
{"title":"The role of irregular particle geometry in highly plastic impact","authors":"Jacob O. Wilson , Changmin Son , James Loebig , Rui Qiao","doi":"10.1016/j.powtec.2024.120590","DOIUrl":"10.1016/j.powtec.2024.120590","url":null,"abstract":"<div><div>The impact of irregular micro-particles against ductile substrates is ubiquitous in engineering equipment, and predicting their rebound through reduced-order models is often necessary. Poor understanding of how non-spherical geometry influences rebound behavior – especially in the regime of finite plastic deformation of the substrate – greatly limits the utility of existing rebound models. Here, high-fidelity impact simulations are leveraged to extract the key features that emerge from irregular, fully resolved sand particle geometries and to identify the physical mechanisms driving them. We show that energy partitioning throughout the impact process differs fundamentally between the spherical and irregular sand particle geometries considered. Because of its relationship with rotation induced during impact, the normalized moment arm parameterization of global particle mass distribution is found to be highly effective in capturing these differences. Finer details of particle shape governing local contact geometry, e.g., local angularity, are argued to be of secondary importance.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"453 ","pages":"Article 120590"},"PeriodicalIF":4.5,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143100817","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-06DOI: 10.1016/j.powtec.2025.120627
Chao Zhang , Miaoran Lu , Han Bao , Nan Ma , Dandan Yu , Yang Yang , Yueshe Wang , Alfred Wiedensohler
An improved model is proposed to investigate effects of gas phase temperature, relative humidity and initial solute concentration on the evaporation rate of the aerosol droplet consisted of ammonium sulfate (AS) or sucrose (SC) solution and the water diffusion coefficient in bulk phase. Results show that the new model is more accurate than the traditional model ignoring the bulk phase mass diffusion. Effect of the bulk phase mass diffusion on the evaporation rate of the AS-water droplet is almost unaffected by factors studied here due to the predominance of the mass transfer in gas phase and gas-droplet interface. However, effect of the bulk phase mass diffusion on the evaporation rate of the SC-water droplet is negatively correlated with the gas phase temperature and the relative humidity, but it is positively correlated with the initial solute concentration. Furthermore, influence mechanisms of the water diffusion coefficient in AS (SC)-water droplets are revealed.
{"title":"An improved model on the evaporation kinetics of the single aerosol droplet and its application for the droplet composed of ammonium sulfate or sucrose solution","authors":"Chao Zhang , Miaoran Lu , Han Bao , Nan Ma , Dandan Yu , Yang Yang , Yueshe Wang , Alfred Wiedensohler","doi":"10.1016/j.powtec.2025.120627","DOIUrl":"10.1016/j.powtec.2025.120627","url":null,"abstract":"<div><div>An improved model is proposed to investigate effects of gas phase temperature, relative humidity and initial solute concentration on the evaporation rate of the aerosol droplet consisted of ammonium sulfate (AS) or sucrose (SC) solution and the water diffusion coefficient in bulk phase. Results show that the new model is more accurate than the traditional model ignoring the bulk phase mass diffusion. Effect of the bulk phase mass diffusion on the evaporation rate of the AS-water droplet is almost unaffected by factors studied here due to the predominance of the mass transfer in gas phase and gas-droplet interface. However, effect of the bulk phase mass diffusion on the evaporation rate of the SC-water droplet is negatively correlated with the gas phase temperature and the relative humidity, but it is positively correlated with the initial solute concentration. Furthermore, influence mechanisms of the water diffusion coefficient in AS (SC)-water droplets are revealed.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"453 ","pages":"Article 120627"},"PeriodicalIF":4.5,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143156775","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
To improve the wind-resistant and capturing dust ability of a dust control spray, the influence of wind velocity and cross spray on the atomizing and dust control performances of spray field were investigated based on the self-constructed system. The results showed that the wind velocity had a certain weakening effect on the atomizing and dust suppression ability of a single spray, especially when the wind velocity exceeded 1.5 m/s, the condensation behavior between droplets increased and dust control efficiency decreased significantly. Meanwhile, the jet direction of a spray field was obviously deviated after 1.5 m/s, being harmful to the construction of a dust control spray. In contrast, cross spray could obviously enhance the wind-resistant ability of a dust control spray, while also enhancing coal dust control performance. For example, the cross spray formed by nozzles with a spacing of 10 cm had a 33.3 % increase in a critical wind velocity, from 1.5 m/s to 2.0 m/s; and showed a better atomizing and dust control characteristics than that of a single spray. Field application indicated that compared with that of the original spray, the newly constructed spray showed a better ability in controlling coal dust, of which control efficiency of total dust and respirable dust could be improved by 20.1 %, 24.4 %, reaching to 87.9 %, 83.8 %, respectively.
{"title":"Effects of wind velocity and cross spray on atomizing characteristics and dust removal efficiency of spray field","authors":"Qun Zhou , Leilin Zhang , Wanlin Zhang , Yiding Dong , Jie Zhang","doi":"10.1016/j.powtec.2025.120626","DOIUrl":"10.1016/j.powtec.2025.120626","url":null,"abstract":"<div><div>To improve the wind-resistant and capturing dust ability of a dust control spray, the influence of wind velocity and cross spray on the atomizing and dust control performances of spray field were investigated based on the self-constructed system. The results showed that the wind velocity had a certain weakening effect on the atomizing and dust suppression ability of a single spray, especially when the wind velocity exceeded 1.5 m/s, the condensation behavior between droplets increased and dust control efficiency decreased significantly. Meanwhile, the jet direction of a spray field was obviously deviated after 1.5 m/s, being harmful to the construction of a dust control spray. In contrast, cross spray could obviously enhance the wind-resistant ability of a dust control spray, while also enhancing coal dust control performance. For example, the cross spray formed by nozzles with a spacing of 10 cm had a 33.3 % increase in a critical wind velocity, from 1.5 m/s to 2.0 m/s; and showed a better atomizing and dust control characteristics than that of a single spray. Field application indicated that compared with that of the original spray, the newly constructed spray showed a better ability in controlling coal dust, of which control efficiency of total dust and respirable dust could be improved by 20.1 %, 24.4 %, reaching to 87.9 %, 83.8 %, respectively.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"453 ","pages":"Article 120626"},"PeriodicalIF":4.5,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143156703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-06DOI: 10.1016/j.powtec.2025.120620
Qinwen Yao , Kai Yang , Xiaoxue Zhang , Wuliang Yin , Jianxin Pan , Hua Wang , Qingtai Xiao
In hydrometallurgical leaching of zinc-containing solid wastes, the poor performance of the solid-liquid two-phase mixing process could result in significant energy wastage. It was necessary to realize the assessment of the solid-liquid two-phase mixing state in the stirred tank to provide data support for the mixing process enhancement. In this work, the boundaryless problem of the traditional Voronoi diagram was solved by reconfiguring the boundary through virtual points, and a mixing uniformity assessment method was proposed in combination with the coefficient of variation method. Meanwhile, the mapping of image pixels to Voronoi cells was established, breaking through the limitation that the traditional camera technique could only be used for surface measurements, and realizing point measurements of solid-phase concentration distribution relationships. The evaluation results show that the uniformity of the four images with normal, circular, concentrated and Poisson distributions were 1.87, 1.50, 4.38 and 0.61, respectively. The uniformity of the mixing images for the similar model at the moments of 6.4, 10 and 11 s were 1.51, 1.25 and 0.38, respectively. The present method was very sensitive to the variation of the solid-phase distribution. Point measurements enabled qualitative and quantitative analysis of the spatial and temporal characteristics of particle concentrations. Qualitative analyses help to visualize changes in mixing conditions. The quantitative analysis helps to target improvements in the mixing process. In addition, the method could be extended to analyze flow and mixing processes with discrete geometrical features.
{"title":"Evaluation on the mixing state of solid-liquid two-phase in stirred tank via an improved Voronoi diagram approach","authors":"Qinwen Yao , Kai Yang , Xiaoxue Zhang , Wuliang Yin , Jianxin Pan , Hua Wang , Qingtai Xiao","doi":"10.1016/j.powtec.2025.120620","DOIUrl":"10.1016/j.powtec.2025.120620","url":null,"abstract":"<div><div>In hydrometallurgical leaching of zinc-containing solid wastes, the poor performance of the solid-liquid two-phase mixing process could result in significant energy wastage. It was necessary to realize the assessment of the solid-liquid two-phase mixing state in the stirred tank to provide data support for the mixing process enhancement. In this work, the boundaryless problem of the traditional Voronoi diagram was solved by reconfiguring the boundary through virtual points, and a mixing uniformity assessment method was proposed in combination with the coefficient of variation method. Meanwhile, the mapping of image pixels to Voronoi cells was established, breaking through the limitation that the traditional camera technique could only be used for surface measurements, and realizing point measurements of solid-phase concentration distribution relationships. The evaluation results show that the uniformity of the four images with normal, circular, concentrated and Poisson distributions were 1.87, 1.50, 4.38 and 0.61, respectively. The uniformity of the mixing images for the similar model at the moments of 6.4, 10 and 11 s were 1.51, 1.25 and 0.38, respectively. The present method was very sensitive to the variation of the solid-phase distribution. Point measurements enabled qualitative and quantitative analysis of the spatial and temporal characteristics of particle concentrations. Qualitative analyses help to visualize changes in mixing conditions. The quantitative analysis helps to target improvements in the mixing process. In addition, the method could be extended to analyze flow and mixing processes with discrete geometrical features.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"453 ","pages":"Article 120620"},"PeriodicalIF":4.5,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143156776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-01-06DOI: 10.1016/j.powtec.2025.120619
Shuangcheng Fu , Minghui Xu , Liang Tao , Shengzheng Wang , Cheng Zhu , Faqi Zhou , Shenghu Yan , Yue Zhang
Anode materials (graphite particles) require pneumatic conveying for use in lithium-ion battery fabrication. Particle stratification often occurs during this process, leading to non-uniform physical and chemical properties. These non-uniform properties negatively impact battery performance. To address this, the use of a threaded pipe section is proposed to enhance particle-mixing performance. The flow field characteristics and particle motion behavior within both threaded and straight pipes were examined through numerical simulation and experimentation under varying operating conditions.
The results show that the threaded pipe section alters the gas flow, reduces particle stratification, significantly improves particle mixing, and promotes more uniform conveying. Increasing the airflow velocity in the threaded pipe causes greater particle disturbance compared to the straight pipe at the same conveying concentration, leading to a more even distribution and better mixing of large and small particles. When the conveying velocity is between 3 m/s and 7 m/s, the mixing performance 1 m from the inlet in the threaded pipe improves by 44–57 % compared to the straight pipe. Similarly, the threaded pipe continues to demonstrate superior mixing performance as the conveying concentration increases. At concentrations ranging from 1 % to 5 %, the mixing performance 1 m from the inlet improves by 37–55 % when using the threaded pipe compared to the straight pipe.
{"title":"Conveying and mixing characteristics of Lithium-ion battery anode material particles in horizontal pipes","authors":"Shuangcheng Fu , Minghui Xu , Liang Tao , Shengzheng Wang , Cheng Zhu , Faqi Zhou , Shenghu Yan , Yue Zhang","doi":"10.1016/j.powtec.2025.120619","DOIUrl":"10.1016/j.powtec.2025.120619","url":null,"abstract":"<div><div>Anode materials (graphite particles) require pneumatic conveying for use in lithium-ion battery fabrication. Particle stratification often occurs during this process, leading to non-uniform physical and chemical properties. These non-uniform properties negatively impact battery performance. To address this, the use of a threaded pipe section is proposed to enhance particle-mixing performance. The flow field characteristics and particle motion behavior within both threaded and straight pipes were examined through numerical simulation and experimentation under varying operating conditions.</div><div>The results show that the threaded pipe section alters the gas flow, reduces particle stratification, significantly improves particle mixing, and promotes more uniform conveying. Increasing the airflow velocity in the threaded pipe causes greater particle disturbance compared to the straight pipe at the same conveying concentration, leading to a more even distribution and better mixing of large and small particles. When the conveying velocity is between 3 m/s and 7 m/s, the mixing performance 1 m from the inlet in the threaded pipe improves by 44–57 % compared to the straight pipe. Similarly, the threaded pipe continues to demonstrate superior mixing performance as the conveying concentration increases. At concentrations ranging from 1 % to 5 %, the mixing performance 1 m from the inlet improves by 37–55 % when using the threaded pipe compared to the straight pipe.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"453 ","pages":"Article 120619"},"PeriodicalIF":4.5,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143156702","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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