An in-depth numerical simulation analysis of the hydrodynamic characteristics of internally-reinforced spouted beds

IF 4.3 2区材料科学 Q2 ENGINEERING, CHEMICAL Particuology Pub Date : 2025-03-14 DOI:10.1016/j.partic.2025.03.003

Qin Bai , Feng Wu , Junhao Hao , Xiaolong Li , Zhian Deng

{"title":"An in-depth numerical simulation analysis of the hydrodynamic characteristics of internally-reinforced spouted beds","authors":"Qin Bai , Feng Wu , Junhao Hao , Xiaolong Li , Zhian Deng","doi":"10.1016/j.partic.2025.03.003","DOIUrl":null,"url":null,"abstract":"<div><div>Due to the lack of gas-solid radial mixing in conventional spouted bed (CSB), particles are prone to accumulation and the formation of flow dead zones. To address the limitations of CSBs, this study, for the first time, the combination optimization of the two strengthening internal components of multi-jets and draft tube was carried out, and two new types of internal strengthening structural spouted beds were proposed: the Integral Multi-jets Draft-tube Spout-fluidized Bed (IMDSFB), and the Integral Multi-jets Open-hole Draft-tube Spout-fluidized Bed (IMODSFB). At the same time, the hydrodynamic characteristics of IMDSFB and IMODSFB are studied by numerical simulation for the first time and compared with the draft tube spouted bed (DTSB) and CSB. Results indicate that compared to CSB, the spouting heights of the DTSB, IMDSFB, and IMODSFB were enhanced by 2.92°%, 14.75°%, and 7.94°%, respectively, and the dead zone of the DTSB, IMDSFB, and IMODSFB decreased by 14°%, 1°%, and 5°%, respectively. Compared to the CSB and DTSB, the addition of novel internal components notably improved the radial velocities of both gas and particles, as well as the gas-solid slip velocity, while reducing flow dead zones within the bed. Furthermore, the gas turbulence kinetic energy in the novel spout-fluidized beds was higher, with increased fluctuations of gas velocity in the spouting region. The granular temperature in the IMDSFB and IMODSFB was higher than in the CSB and DTSB, indicating enhanced particle fluctuations within the bed. These improvements contribute to more efficient gas-solid phase interactions, thereby enhancing the overall performance of the spouted bed.</div></div>","PeriodicalId":401,"journal":{"name":"Particuology","volume":"100 ","pages":"Pages 1-13"},"PeriodicalIF":4.3000,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Particuology","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1674200125000719","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}

引用次数: 0

Abstract

Due to the lack of gas-solid radial mixing in conventional spouted bed (CSB), particles are prone to accumulation and the formation of flow dead zones. To address the limitations of CSBs, this study, for the first time, the combination optimization of the two strengthening internal components of multi-jets and draft tube was carried out, and two new types of internal strengthening structural spouted beds were proposed: the Integral Multi-jets Draft-tube Spout-fluidized Bed (IMDSFB), and the Integral Multi-jets Open-hole Draft-tube Spout-fluidized Bed (IMODSFB). At the same time, the hydrodynamic characteristics of IMDSFB and IMODSFB are studied by numerical simulation for the first time and compared with the draft tube spouted bed (DTSB) and CSB. Results indicate that compared to CSB, the spouting heights of the DTSB, IMDSFB, and IMODSFB were enhanced by 2.92°%, 14.75°%, and 7.94°%, respectively, and the dead zone of the DTSB, IMDSFB, and IMODSFB decreased by 14°%, 1°%, and 5°%, respectively. Compared to the CSB and DTSB, the addition of novel internal components notably improved the radial velocities of both gas and particles, as well as the gas-solid slip velocity, while reducing flow dead zones within the bed. Furthermore, the gas turbulence kinetic energy in the novel spout-fluidized beds was higher, with increased fluctuations of gas velocity in the spouting region. The granular temperature in the IMDSFB and IMODSFB was higher than in the CSB and DTSB, indicating enhanced particle fluctuations within the bed. These improvements contribute to more efficient gas-solid phase interactions, thereby enhancing the overall performance of the spouted bed.

Abstract Image

查看原文

微信好友朋友圈 QQ好友复制链接

本刊更多论文

对内加筋喷流床水动力特性进行了深入的数值模拟分析

传统喷淋床由于缺乏气固径向混合，颗粒容易积聚，形成流动死区。针对CSBs的局限性，本研究首次对多射流和尾水管两种强化内部部件进行组合优化，提出了两种新型内部强化结构喷流床：整体式多射流尾水管喷流床（IMDSFB）和整体式多射流开孔尾水管喷流床（IMODSFB）。同时，首次通过数值模拟研究了IMDSFB和IMODSFB的水动力特性，并与尾水管喷流床（DTSB）和CSB进行了比较。结果表明，与CSB相比，DTSB、IMDSFB和IMODSFB的喷淋高度分别提高了2.92°%、14.75°%和7.94°%，DTSB、IMDSFB和IMODSFB的死区分别降低了14°%、1°%和5°%。与CSB和DTSB相比，新型内部组件的添加显著提高了气体和颗粒的径向速度，以及气固滑移速度，同时减少了床层内的流动死区。此外，新型喷流流化床内的气体湍流动能更高，喷流区气体流速波动增大。IMDSFB和IMODSFB的颗粒温度高于CSB和DTSB，表明床内颗粒波动增强。这些改进有助于更有效的气固相相互作用，从而提高喷淋床的整体性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文去求助

来源期刊

Particuology 工程技术-材料科学：综合

CiteScore

6.70

自引率

2.90%

发文量

1730

审稿时长

32 days

期刊介绍： The word ‘particuology’ was coined to parallel the discipline for the science and technology of particles. Particuology is an interdisciplinary journal that publishes frontier research articles and critical reviews on the discovery, formulation and engineering of particulate materials, processes and systems. It especially welcomes contributions utilising advanced theoretical, modelling and measurement methods to enable the discovery and creation of new particulate materials, and the manufacturing of functional particulate-based products, such as sensors. Papers are handled by Thematic Editors who oversee contributions from specific subject fields. These fields are classified into: Particle Synthesis and Modification; Particle Characterization and Measurement; Granular Systems and Bulk Solids Technology; Fluidization and Particle-Fluid Systems; Aerosols; and Applications of Particle Technology. Key topics concerning the creation and processing of particulates include: -Modelling and simulation of particle formation, collective behaviour of particles and systems for particle production over a broad spectrum of length scales -Mining of experimental data for particle synthesis and surface properties to facilitate the creation of new materials and processes -Particle design and preparation including controlled response and sensing functionalities in formation, delivery systems and biological systems, etc. -Experimental and computational methods for visualization and analysis of particulate system. These topics are broadly relevant to the production of materials, pharmaceuticals and food, and to the conversion of energy resources to fuels and protection of the environment.