Powder Technology最新文献_第9页

A new method for determining activation energy in spark plasma sintering 确定火花等离子烧结活化能的新方法

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-10-18 DOI: 10.1016/j.powtec.2024.120367

Z. Liu , T. Chen , Y. Yang , T. Song , W.S. Cai , H.B. Ke , W.H. Wang , C. Yang

引用次数: 0

Numerical investigation and correlation development for pressure drop in pneumatic conveying through blinded T-bends 通过盲 T 形弯管进行气力输送时压力降的数值研究和相关性开发

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-10-18 DOI: 10.1016/j.powtec.2024.120375

Fatemeh Rashidi Gugheri, Hossein Ali Pakravan

引用次数: 0

Effect of low volume fraction of H2 on explosion characteristics and mechanism of AlH3 dust via connected container 低体积分数 H2 对通过连接容器的 AlH3 粉尘爆炸特性和机理的影响

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-10-18 DOI: 10.1016/j.powtec.2024.120372

Hao Wang , Xinfeng Li , Chuanbiao Zhang , Jiani Xie , Xin Zhang , Yanwu Yu , Xueqiang Shi , Fengyuan Jiao , Sen Xu , Weiguo Cao

{"title":"Effect of low volume fraction of H2 on explosion characteristics and mechanism of AlH3 dust via connected container","authors":"Hao Wang , Xinfeng Li , Chuanbiao Zhang , Jiani Xie , Xin Zhang , Yanwu Yu , Xueqiang Shi , Fengyuan Jiao , Sen Xu , Weiguo Cao","doi":"10.1016/j.powtec.2024.120372","DOIUrl":"10.1016/j.powtec.2024.120372","url":null,"abstract":"<div><div>During the storage and use of AlH<sub>3</sub>, a small amount of H<sub>2</sub> is easily decomposed, forming a multiphase composite system that increases explosive hazard. This article discussed the AlH<sub>3</sub> dust inducing low concentration H<sub>2</sub> explosion and venting characteristics by a connected vessel. The results show that when the concentration of H<sub>2</sub> was 1 % and 3 %, which was lower than the lower explosive limit of H<sub>2</sub> (4 %), H<sub>2</sub> was non-flammable, and the explosion was dust-driven explosion. At H<sub>2</sub> volume fraction of 5 %, a dual-fuel-driven explosion dominated, culminating in the maximum explosion pressure, reduced pressure, venting flame length, and velocity. The microscopic reaction mechanism of AlH<sub>3</sub> with H<sub>2</sub> was explored using molecular dynamics simulations. Meanwhile, for the security strategy of AlH<sub>3</sub> dust explosion venting with low H<sub>2</sub> atmosphere, the NFPA 68 and EN 14491 standards predicted the venting flame length effectively, offering critical insights for the application and safety design of AlH<sub>3</sub>.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"449 ","pages":"Article 120372"},"PeriodicalIF":4.5,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142526466","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 simulation of multiphase flow induced by bottom blowing limestone powder in converter steelmaking 转炉炼钢中底吹石灰石粉引发的多相流数值模拟

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-10-17 DOI: 10.1016/j.powtec.2024.120369

Kaixuan Zhang , Shuhuan Wang , Chenxiao Li , Zhipeng Yuan , Yanchao Zhang

{"title":"Numerical simulation of multiphase flow induced by bottom blowing limestone powder in converter steelmaking","authors":"Kaixuan Zhang , Shuhuan Wang , Chenxiao Li , Zhipeng Yuan , Yanchao Zhang","doi":"10.1016/j.powtec.2024.120369","DOIUrl":"10.1016/j.powtec.2024.120369","url":null,"abstract":"<div><div>A full-scale three-dimensional model of a 120 t steel converter was established to evaluate the effects of bottom-blown limestone particle injection speed, diameter, and nozzle location on the particle distribution and molten metal flow field using numerical simulations. The results indicated that a particle injection speed of 6 m/s, particle diameter of 0.5 mm, and injection nozzle location at 1/2 of the converter bottom radius provided the longest particle residence time and largest quantity of particles in the molten metal. Furthermore, the use of these parameters produced within the molten metal an obvious particle concentration along the centerline of the converter, the fastest average liquid metal–particle flow velocity, and moderate splashing. These optimal injection parameters created favorable kinetic conditions for the dephosphorization reaction essential to steelmaking. This study provide a theoretical basis for realizing the improved efficiency associated with the use limestone instead of lime in practical steel production.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"449 ","pages":"Article 120369"},"PeriodicalIF":4.5,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142526357","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

Particle aggregation and the grinding limit in high energy ball mill 高能球磨机中的颗粒聚集和研磨极限

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-10-16 DOI: 10.1016/j.powtec.2024.120370

Anna G. Matveeva , Tatiana S. Skripkina , Vyacheslav M. Nekrasov , Uliana E. Nikiforova , Vladimir A. Bukhtoyarov , Aleksey Bychkov , Igor Lomovskiy

{"title":"Particle aggregation and the grinding limit in high energy ball mill","authors":"Anna G. Matveeva , Tatiana S. Skripkina , Vyacheslav M. Nekrasov , Uliana E. Nikiforova , Vladimir A. Bukhtoyarov , Aleksey Bychkov , Igor Lomovskiy","doi":"10.1016/j.powtec.2024.120370","DOIUrl":"10.1016/j.powtec.2024.120370","url":null,"abstract":"<div><div>Dust aggregates — clusters of individual particles — are formed during mechanochemical processing of brown coal in a planetary ball mill. The aggregate structure can be identified by comparing the average sizes of aggregates and individual particles. We showed that dust aggregates are generally arranged in a regular way: the number of individual particles located along the aggregate coincides with the number of particles located across the aggregate. Power of power-law distribution of the monomers per aggregate revealed that individual particles stick together in extremely dense clusters. The average number of monomers per claster is ∼10<sup>4</sup>. In addition, it turned out that the dependence of the monomer's “stickiness” on applied energy dose has a kink simultaneously with other characteristics of the mechanochemical process (the monomer size and the chemical reaction depth). Speaking using mechanochemistry terms, it corresponds to transition from the brittle grinding mode to the plastic deformation mode after reaching the grinding limit.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"449 ","pages":"Article 120370"},"PeriodicalIF":4.5,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142526352","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

Bed strength in sheared beds of mono- and bi-disperse particles: Dependence on geometrical and mechanical properties of constituent particles 单分散和双分散颗粒剪切床的床层强度：与组成颗粒的几何和机械特性有关

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-10-16 DOI: 10.1016/j.powtec.2024.120286

Feng Zhao , Yukie Tanino , Jianchun Guo , Rui He , Jichuan Ren , Ji Zeng , Weihua Chen , Liuke Huang

{"title":"Bed strength in sheared beds of mono- and bi-disperse particles: Dependence on geometrical and mechanical properties of constituent particles","authors":"Feng Zhao , Yukie Tanino , Jianchun Guo , Rui He , Jichuan Ren , Ji Zeng , Weihua Chen , Liuke Huang","doi":"10.1016/j.powtec.2024.120286","DOIUrl":"10.1016/j.powtec.2024.120286","url":null,"abstract":"<div><div>Temporary plugging zones are low-permeability fracture-scale plugs ‘assembled’ in situ by injecting polymer particles into petroleum reservoirs. We applied the rolling resistance linear model to simulate the shear strength of a rectangular packed bed, our model for a temporary plugging zone, comprising either uniform-sized particles or a binary mixture of larger bridging particles and smaller filling particles. Simulation results show that the strength of uniform beds increases with the size, the aspect ratio, the friction coefficient, and the Young’s modulus of the particles. The strength of binary packed beds first increased and then decreased as the fractional volume of the domain occupied by filling particles increased. Maximum strength was achieved when bridging particles have uniform Young’s modulus and aspect ratio but a range of friction coefficients, and their friction coefficient, Young’s modulus and aspect ratio are 21%, 17% and 18% larger than those of filling particles.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"449 ","pages":"Article 120286"},"PeriodicalIF":4.5,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142526345","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

Lightweight mask R-CNN for instance segmentation and particle physical property analysis in multiphase flow 用于多相流中实例分割和颗粒物理性质分析的轻量级掩模 R-CNN

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-10-16 DOI: 10.1016/j.powtec.2024.120366

Mingxiang He , Kexin He , Qingshan Huang , Hang Xiao , Haidong Zhang , Guan Li , Aqiang Chen

{"title":"Lightweight mask R-CNN for instance segmentation and particle physical property analysis in multiphase flow","authors":"Mingxiang He , Kexin He , Qingshan Huang , Hang Xiao , Haidong Zhang , Guan Li , Aqiang Chen","doi":"10.1016/j.powtec.2024.120366","DOIUrl":"10.1016/j.powtec.2024.120366","url":null,"abstract":"<div><div>A lightweight Mask R-CNN instance segmentation model was developed here to analyze particle size and shape accurately and quickly. Firstly, a hybrid Depthwise Dilated Convolutional Network (DDNet) is proposed, and the feature pyramid layers and the shared convolutional layers of the region proposal network are simplified, reducing the model complexity while ensuring robust feature extraction capabilities. Then, segmentation accuracy is significantly improved without sacrificing computational speed and performance by introducing the Dice loss function and clustering algorithm. Experimental results show that the model parameters are significantly reduced by 49.46%, and the segmentation speed increases from 2.15 FPS (frames per second) to 5.88 FPS. Meanwhile, the segmentation accuracy (AP50) increased from 90.56% to 91.21%. In addition, it was proven that the particle size distribution and shape could be analyzed accurately and rapidly with the proposed model, providing essential information for multiphase flow process optimization and equipment design in industrial applications.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"449 ","pages":"Article 120366"},"PeriodicalIF":4.5,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142526350","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

Suppression characteristic of three inhibitors on the flame propagation of titanium dust layer 三种抑制剂对钛粉尘层火焰传播的抑制特性

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-10-16 DOI: 10.1016/j.powtec.2024.120368

Yongxu Wang , Jing Zhang , Zhongkun Yang , Bin Li , Lifeng Xie , Yong Cao

{"title":"Suppression characteristic of three inhibitors on the flame propagation of titanium dust layer","authors":"Yongxu Wang , Jing Zhang , Zhongkun Yang , Bin Li , Lifeng Xie , Yong Cao","doi":"10.1016/j.powtec.2024.120368","DOIUrl":"10.1016/j.powtec.2024.120368","url":null,"abstract":"<div><div>The suppression effect of three inhibitors (TiO<sub>2</sub>, NaHCO<sub>3</sub>, and NH<sub>4</sub>H<sub>2</sub>PO<sub>4</sub>) on the flame propagation of titanium dust layer is investigated in the self-made experimental system. Both camera and infrared images are used to record the effect of the inhibitor on the flame propagation process of titanium/inhibitors powder. The combustion products of three inhibitor/Ti dusts are analyzed to suppression mechanism of inhibitors. The effect of three inhibitors on the ignition induction time of the titanium powder is studied. The decomposition process of NaHCO<sub>3</sub> and NH<sub>4</sub>H<sub>2</sub>PO<sub>4</sub> and the production of gas under high temperature conditions may be the main reason for accelerating the flame propagation. The multiple high temperature regions in the dust layer can accelerate the flame propagation rate. Suppression mechanisms of three inhibitors are explained in detail. The inhibition mechanism of TiO<sub>2</sub> mainly lies in its strong thermal stability. The inhibition effects of NaHCO<sub>3</sub> and NH<sub>4</sub>H<sub>2</sub>PO<sub>4</sub> include the dilution process and the decomposition process.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"449 ","pages":"Article 120368"},"PeriodicalIF":4.5,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142526351","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

Structural properties and mechanical behavior of three-dimensional cylindrical particle-like systems under in situ loading 原位加载下三维圆柱形类粒子系统的结构特性和力学行为

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-10-16 DOI: 10.1016/j.powtec.2024.120365

YanJi Gu , FanXiu Chen , Yang Yu , Chao Cui , Yuan Zhang , JingLan Liu , ZiMing Qiu

{"title":"Structural properties and mechanical behavior of three-dimensional cylindrical particle-like systems under in situ loading","authors":"YanJi Gu , FanXiu Chen , Yang Yu , Chao Cui , Yuan Zhang , JingLan Liu , ZiMing Qiu","doi":"10.1016/j.powtec.2024.120365","DOIUrl":"10.1016/j.powtec.2024.120365","url":null,"abstract":"<div><div>To investigate the mechanical behavior of granular systems and their impact on density uniformity during compression, a three-dimensional micro-CT in situ loading experiment was conducted on a cylindrical granular system. The granular system was subjected to tomographic scanning and reconstruction, and the variation patterns of structural parameters such as volume fraction, porosity, and intrinsic density during the in situ loading process were analyzed. Internal pores within the granular system were extracted to obtain changes in pore area at each layer, allowing for an analysis of the evolving patterns of layered pore areas across different regions of the granular system during loading. This characterization elucidated the dynamic evolution process of compaction within the granular system. A contact network model for the granular system was established using particle contact area as a representation of inter-particle contact forces, revealing inherent connections between particle contact networks and macroscopic mechanical behaviors within the granular system.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"449 ","pages":"Article 120365"},"PeriodicalIF":4.5,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142526338","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

Data-driven system identification and model predictive control of pneumatic conveying using nonlinear dynamics analysis for optimised energy consumption 利用非线性动力学分析对气力输送进行数据驱动的系统识别和模型预测控制，优化能源消耗

IF 4.5 2区工程技术

Powder Technology Pub Date : 2024-10-16 DOI: 10.1016/j.powtec.2024.120364

Osamh S. Alshahed , Baldeep Kaur , Michael S.A. Bradley , David Armour-Chelu

{"title":"Data-driven system identification and model predictive control of pneumatic conveying using nonlinear dynamics analysis for optimised energy consumption","authors":"Osamh S. Alshahed , Baldeep Kaur , Michael S.A. Bradley , David Armour-Chelu","doi":"10.1016/j.powtec.2024.120364","DOIUrl":"10.1016/j.powtec.2024.120364","url":null,"abstract":"<div><div>Pneumatic conveying systems provide secure transportation of particulate material and a dust-free environment. These systems face high energy consumption, material degradation, and pipeline blockages. This research presents an innovative solution by integrating nonlinear dynamics analysis of electrostatic sensor data, including chaos and recurrence quantification analysis, sparse identification of nonlinear dynamics with control (SINDYc) and model predictive control (MPC). The Lyapunov exponent, approximate entropy and recurrence rate of electrostatic sensor data reveal the chaotic nature of gas-solid flows. MPC framework was tailored for real-time optimisation of a pneumatic conveying system. SINDYc system models were developed using data collected from an open-loop control pneumatic conveying process to conduct MPC simulations and select an appropriate model for real-time control. This research illustrates the potential of integrating nonlinear dynamics analysis, SINDYc integrated and MPC for enhanced system performance, showcased a significant reduction in energy consumption without compromising the system's efficiency or reliability.</div></div>","PeriodicalId":407,"journal":{"name":"Powder Technology","volume":"449 ","pages":"Article 120364"},"PeriodicalIF":4.5,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142526358","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