Powder Technology最新文献_第10页

Optimizing multistage fluidized bed reactor performance: Computational insights and design modifications

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-03-04 DOI: 10.1016/j.powtec.2025.120804

Haile Jose, Swapna Singha Rabha

{"title":"Optimizing multistage fluidized bed reactor performance: Computational insights and design modifications","authors":"Haile Jose, Swapna Singha Rabha","doi":"10.1016/j.powtec.2025.120804","DOIUrl":"10.1016/j.powtec.2025.120804","url":null,"abstract":"<div><div>Multistage fluidized bed reactors (MFBR) offer enhanced gas–solid interactions, longer residence times, and reduced bubble growth compared to conventional fluidized bed reactors, making them promising candidates for carbon capture applications. Understanding the hydrodynamics is crucial for optimizing the reactor design. This study presents a 2D numerical investigation of the hydrodynamics in a two-stage MFBR using the Euler–Euler Two-Fluid model, with the Syamlal O’Brien drag model tuned to experimental minimum fluidization conditions. The predicted pressure drops across the reactor stages closely matched experimental data, validating the model’s accuracy. Key parameters such as clearance height, gas velocity, and particle size were analyzed for their effects on pressure drop, solid holdup, velocity profiles, and solid entrainment flux. Additionally, the power consumption of the MFBR, based on pressure drop, was evaluated and compared to that of a conventional fluidized bed reactor. The results provide critical insights into the hydrodynamic behavior of MFBRs under various operating conditions, offering valuable guidance for optimizing reactor design, particularly for carbon capture using solid sorbents.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"456 ","pages":"Article 120804"},"PeriodicalIF":4.5,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143550813","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}

引用次数: 0

Flotation separation of chalcopyrite and molybdenite in advanced oxidation systems: Experimental and mechanism study

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-03-04 DOI: 10.1016/j.powtec.2025.120876

Wenhui Yang , Xianhui Qiu , Chunlong Liu , Guanfei Zhao , Huashan Yan , Xiaomin He , Kaiwei Ding , Qinghao Jiao , Tingsheng Qiu

{"title":"Flotation separation of chalcopyrite and molybdenite in advanced oxidation systems: Experimental and mechanism study","authors":"Wenhui Yang , Xianhui Qiu , Chunlong Liu , Guanfei Zhao , Huashan Yan , Xiaomin He , Kaiwei Ding , Qinghao Jiao , Tingsheng Qiu","doi":"10.1016/j.powtec.2025.120876","DOIUrl":"10.1016/j.powtec.2025.120876","url":null,"abstract":"<div><div>In this paper, the flotation performance and mechanism of chalcopyrite and molybdenite in persulfate/Fe<sup>2+</sup> systems were evaluated for the first time. The flotation results showed that the recovery difference between chalcopyrite and molybdenite was 63.41 % when PS/Fe<sup>2+</sup> were used as depressants. Radicals ·OH and SO<sub>4</sub>-· can be observed in electron paramagnetic resonance analysis, indicating that the addition of PS/Fe<sup>2+</sup> constitutes an advanced oxidation process in minerals systems. The free radical quenching experiments further verified that the free radicals depressed chalcopyrite. To explore the mechanism of free radicals, the contact angle, Fourier transform infrared spectroscopy, Cyclic voltammetry curves and X-ray photoelectron spectroscopy measurements were carried out. The results showed that after PS/Fe<sup>2+</sup> treatment, the surface of chalcopyrite was covered by oxides/hydroxides, while the surface of molybdenite had little change and still maintained good hydrophobicity. Finally, a possible model for reacting PS/Fe<sup>2+</sup> with chalcopyrite was proposed.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120876"},"PeriodicalIF":4.5,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143578100","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}

引用次数: 0

Direct numerical simulation of settling hydrodynamics in system of bidisperse spherical particles

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-03-03 DOI: 10.1016/j.powtec.2025.120844

Muhammad Faraz Khan, Adnan Hamid, Muhammad Nadeem, Atta Ullah

{"title":"Direct numerical simulation of settling hydrodynamics in system of bidisperse spherical particles","authors":"Muhammad Faraz Khan, Adnan Hamid, Muhammad Nadeem, Atta Ullah","doi":"10.1016/j.powtec.2025.120844","DOIUrl":"10.1016/j.powtec.2025.120844","url":null,"abstract":"<div><div>In this study, direct numerical simulations with an enhanced Smooth Profile Method was employed to investigate the settling dynamics of bidisperse spherical particles undergoing gravitational sedimentation. Under the influence of gravity, large particles composed of joint smaller spherical beads settle in a Newtonian fluid. The concentration ratio effect of large to small particles within Stokes regime was studied. The overall system volume fraction <em>φ</em> is maintained at 0.1, while the volume fraction of large particles, denoted as <em>ϕ</em>, is varied from 0.001 to 0.5. The simulation results reveal notable changes in the radial distribution function. The height of the first peak decreases upon increase in the of large particles concentration. Meanwhile, a second peak emerges and progressively grows in prominence. The average system sedimentation velocity of the exhibits an increasing trend with an increase in <em>ϕ</em>. The drag coefficient of the system decreases as <em>ϕ</em> increases. It is also observed that the temporal auto correlation function in axial direction intensifies as increase in <em>ϕ</em>.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120844"},"PeriodicalIF":4.5,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143593849","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}

引用次数: 0

Numerical study on the collection performance according to tilt angle of the collection plate in ESPs

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-03-03 DOI: 10.1016/j.powtec.2025.120873

Jeong Geun Gwon , Ho Yeon Choi , Young Min Seo , Seokho Kim , Hoon Ki Choi , Yong Gap Park

{"title":"Numerical study on the collection performance according to tilt angle of the collection plate in ESPs","authors":"Jeong Geun Gwon , Ho Yeon Choi , Young Min Seo , Seokho Kim , Hoon Ki Choi , Yong Gap Park","doi":"10.1016/j.powtec.2025.120873","DOIUrl":"10.1016/j.powtec.2025.120873","url":null,"abstract":"<div><div>Particulate matter poses serious accident risks and health hazards, making control technologies essential. This study aims to analyze the effectiveness of electrostatic precipitators (ESPs) using corona discharge in reducing particulate matter. We analyze three performance influencing parameters: the applied voltage (<em>φ</em><sub>wire</sub> = 6, 9, and 12 kV), volumetric flow rate (<em>Q</em> = 0.05, 0.1, and 0.15 m<sup>3</sup>/s), and tilt angle of collection plate (<em>θ</em><sub>tilt</sub> = −2.1, −1.4, −0.7, 0, 0.7, 1.4, and 2.1°). In the electric field, the average corona current per unit length of the discharge electrode is enhanced by a maximum of 14.08 % at <em>θ</em><sub>tilt</sub> = 2.1° and − 2.1° when compared to that at <em>θ</em><sub>tilt</sub> = 0°. In the gas flow field, as the tilt angle increases at <em>θ</em><sub>tilt</sub> = 0.7° ∼ 2.1°, the pressure drop also increases corresponding to the applied voltage. This result is reversed at <em>θ</em><sub>tilt</sub> = −2.1° ∼ −0.7°. In particle motion, the larger the tilt angle, the greater the charge of the particle. The collection efficiency at <em>θ</em><sub>tilt</sub> = 2.1° increases by approximately 10 % at <em>φ</em><sub>wire</sub> = 9 kV and <em>Q</em> = 0.1 m<sup>3</sup>/s, compared to that at <em>θ</em><sub>tilt</sub> = −2.1°. However, in long-term operation, <em>θ</em><sub>tilt</sub> = −2.1° is most advantageous due to its even distribution of particles across the collection plate.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120873"},"PeriodicalIF":4.5,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143562419","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}

引用次数: 0

Improving heat transfer efficiency in a ribbed channel with two test sections using hybrid nanofluid

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-03-03 DOI: 10.1016/j.powtec.2025.120875

Fatima-Zahra Barhdadi , Ikrame Jamal , Salah Daoudi , Abderrahmane Kaouachi

{"title":"Improving heat transfer efficiency in a ribbed channel with two test sections using hybrid nanofluid","authors":"Fatima-Zahra Barhdadi , Ikrame Jamal , Salah Daoudi , Abderrahmane Kaouachi","doi":"10.1016/j.powtec.2025.120875","DOIUrl":"10.1016/j.powtec.2025.120875","url":null,"abstract":"<div><div>Improving the rate of heat transfer is a key factor in making thermal devices for various industries more efficient and less energy consuming. With the development of corrugated channels that improve convection in an affordable way, passive techniques to optimize heat transfer have come to market. The objective of this study was to evaluate the performance of a new geometric design of a corrugated channel and the effect of hybrid nanofluids (Ag-ZnO/water, Ag-TiO<sub>2</sub>/water, Ag-Al<sub>2</sub>O<sub>3</sub>/water and Ag-MgO/water) with different volume concentrations on heat transfer enhancement. The results show that the new geometry of the corrugated channel increases the Nusselt number and the Performance Evaluation Criterion by 94 % and 13,73 % respectively compared to the smooth channel and by 10,31 % compared to the previously studied ribbed channel. The increase the Reynolds number improves the heat transfer due to higher flow velocities and rib disturbance. However, the presence of ribs results in higher friction factors and pressure drop compared to smooth channels, which we have attempted to reduce by up to 14 % by increasing the rib width. The introduction of Ag (0.5 %)-TiO<sub>2</sub>(1.5 %)/water hybrid nanofluid increases heat transfer by 16.75 % compared to water. In addition, the use of Syltherm 800 as the base fluid increases the heat transfer enhancement to a good level. These results contribute to understanding the effects of rib distribution over two test sections, rib width and nanoparticle volume fraction in hybrid nanofluids on ribbed channel performance. They also help to optimize the design of efficient heat transfer systems.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120875"},"PeriodicalIF":4.5,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143562418","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}

引用次数: 0

Energy-based ball milling process design and dispersion behavior of high content CNTs/Cu composites

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-03-03 DOI: 10.1016/j.powtec.2025.120874

Ziyang Xiu , Jinpeng Sun , Xiao Li , Yihao Chen , Yue Yan , Puzhen Shao , Yuhong Li , Wenshu Yang , Guoqin Chen , Boyu Ju

{"title":"Energy-based ball milling process design and dispersion behavior of high content CNTs/Cu composites","authors":"Ziyang Xiu , Jinpeng Sun , Xiao Li , Yihao Chen , Yue Yan , Puzhen Shao , Yuhong Li , Wenshu Yang , Guoqin Chen , Boyu Ju","doi":"10.1016/j.powtec.2025.120874","DOIUrl":"10.1016/j.powtec.2025.120874","url":null,"abstract":"<div><div>The uniform dispersion of high content CNTs in metal matrix composites is a key problem restricting the preparation of materials. Aiming at the problem of agglomeration and damage of CNTs in the preparation of composites, the ball milling energy formula of CNTs/Cu mixed powder during ball milling was established in this paper. The relationship between ball milling parameters and dispersed structure was established by quantitative calculation of ball milling energy, and the ball milling energy equation suitable for high content CNTs/Cu composites was established. It is found that the premise of uniform distribution of CNTs in Cu powder is that the ball milling impact energy (<em>E</em><sub><em>p</em></sub>) should be controlled below 142.7 J/(g·hit). According to the critical condition of plastic deformation of Cu powder, <em>E</em><sub><em>p</em></sub> should also be controlled above 1.14 J/(g·hit), and ball milling input energy (<em>E</em><sub><em>t</em></sub>) should be controlled above 1.93 × 10<sup>11</sup> J/g. The reliability of the equation was verified by reference literature, which guided the high-quality preparation of 2 wt% CNT / Cu composites, and the hardness was increased to 2.3 times. This result provides an experimental and theoretical basis for the optimization of ball milling process and the study of low damage dispersion mechanism of high content CNTs in metal matrix composites.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120874"},"PeriodicalIF":4.5,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143687452","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}

引用次数: 0

Clustering behavior of solid particles in gas-liquid-solid circulating fluidized beds studied by telecentric photography

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-03-02 DOI: 10.1016/j.powtec.2025.120857

Yongli Ma , Jiaming Zhang , Hang Xiao , Mingyan Liu

{"title":"Clustering behavior of solid particles in gas-liquid-solid circulating fluidized beds studied by telecentric photography","authors":"Yongli Ma , Jiaming Zhang , Hang Xiao , Mingyan Liu","doi":"10.1016/j.powtec.2025.120857","DOIUrl":"10.1016/j.powtec.2025.120857","url":null,"abstract":"<div><div>The clustering behavior of solid particles in the riser of a gas-liquid-solid circulating fluidized bed significantly affects phase mixing, mass and heat transfer characteristics, but little work has been carried out on this topic. To fill this knowledge gap, we used an invasive telecentric photography to measure and investigate the axial and radial distributions of cluster characteristics of solid particles in the riser of the three-phase circulating fluidized bed. The results showed that at present experimental conditions, cluster size followed a log-normal distribution in the riser. Within the ranges of superficial gas, liquid and particle velocity of 5.6 × 10<sup>−3</sup> to 11.2 × 10<sup>−3</sup> m/s, 112 × 10<sup>−3</sup> to 162 × 10<sup>−3</sup> m/s, and 0.85 × 10<sup>−3</sup> to 2 × 10<sup>−3</sup> m/s (or auxiliary liquid velocity 20 × 10<sup>−3</sup> to 50 × 10<sup>−3</sup> m/s), respectively, 90 % of clusters consisted of about 2 solid particles, with sizes ranging from 0.7 mm to 1.2 mm. Cluster size and velocity increased with superficial liquid velocity, but they were less affected by superficial gas velocity and exhibited a radial structure. Particle aggregation by shedding vortices leads to the cluster formation.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"456 ","pages":"Article 120857"},"PeriodicalIF":4.5,"publicationDate":"2025-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143550819","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}

引用次数: 0

Uncovering turbulence of dust particles in the Hartmann tube through the Image-Subtraction Method

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-03-01 DOI: 10.1016/j.powtec.2025.120871

Luca Marmo , Olivier Dufaud , Fausto Franchini , Enrico Danzi

{"title":"Uncovering turbulence of dust particles in the Hartmann tube through the Image-Subtraction Method","authors":"Luca Marmo , Olivier Dufaud , Fausto Franchini , Enrico Danzi","doi":"10.1016/j.powtec.2025.120871","DOIUrl":"10.1016/j.powtec.2025.120871","url":null,"abstract":"<div><div>The present work investigates the dynamics of dust clouds in space and time when dispersed inside the modified Hartmann tube commonly used for explosibility screening and Minimum Ignition Energy (MIE) measurement. This study focuses on the fluid dynamics of the dust cloud in the space between the electrodes where the ignition occurs since fundamental properties of the dust motion, such as the cloud turbulence (intensity and variation), are known to affect both the ignition sensitivity and explosion severity significantly. An imaging re-elaboration method based on an algorithm (Image-Subtraction Method, ISM) is presented and adopted in the basics of the present research. To clarify the cloud dynamics, a novel approach is proposed here, using LabVIEW® specific algorithms, namely Particle Analysis and optical flow detection methods, which allow the tracking of the motion and the velocity vectors of dust clusters identified in the cloud flow. Concurrently, measuring the intensity of concentration changes between the electrodes (luminance change of the video frames in time and space) and cloud velocity, which likely represents the turbulence, is possible. Different types of dust (iron, starch, silica) were used at different dispersion conditions (dispersion pressure and dust amount). The cloud motion was recorded, and videos were analyzed through LabVIEW® to explore the parameters affecting dust turbulence (powder-specific gravity, particle size distribution, and air blast intensity). The outcomes of this work will help characterize the flow of a dust cloud inside a tube before its ignition and better define the optimal testing conditions for MIE determination.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"457 ","pages":"Article 120871"},"PeriodicalIF":4.5,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143578105","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A new model for prediction of classification performance in closed circuit ball mill systems

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-03-01 DOI: 10.1016/j.powtec.2025.120872

Chengfang Yuan , Cheng Hu , Caibin Wu , Li Ling , Zongyan Zhou , Quan Li , Ziyu Zhou

引用次数: 0

Addition of superfine natural zeolite to improve rheological properties of self-consolidating concrete

IF 4.5 2区工程技术

Powder Technology Pub Date : 2025-03-01 DOI: 10.1016/j.powtec.2025.120868

J.J. Chen , G.X. Guan

{"title":"Addition of superfine natural zeolite to improve rheological properties of self-consolidating concrete","authors":"J.J. Chen , G.X. Guan","doi":"10.1016/j.powtec.2025.120868","DOIUrl":"10.1016/j.powtec.2025.120868","url":null,"abstract":"<div><div>A high packing density is essential to provide self-consolidating concrete (SCC) superior rheological performance. The superfine natural zeolite (SNZ), ground from natural zeolite to have a size finer than cement, can fill the voids between cement grains for packing density improvement. To evaluate the effect of SNZ on rheological properties and the effect of this change in rheological properties on flowability, a total of 28 concrete mixes with different SNZ contents at different paste volume were produced to test yield stress, apparent viscosity, pseudoplastic index, slump-flow and flow rate. The roles of yield stress and apparent viscosity on flowability of SNZ concrete were quantified. And, to reveal the causes of these effects of SNZ on rheological properties and flowability, the changes in packing density and film thicknesses of the concrete mixes were measured. The results disclosed that the effect of SNZ on rheological properties was dependent on the SNZ content and the paste volume. The SNZ affected the flowability through film thicknesses and consequently through rheological properties, and affected the pseudoplastic index mainly through packing density. Addition of 10 % SNZ increased the strength, decreased yield stress and apparent viscosity and slightly increased pseudoplastic index. It is concluded that SNZ has a potential to improve rheological properties to produce high-strength SCC.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"456 ","pages":"Article 120868"},"PeriodicalIF":4.5,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143550818","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}

引用次数: 0