Time-scaled study on the erosion in circulating fluidized bed based on CPFD method

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL

Powder Technology Pub Date : 2023-07-23 DOI:10.1016/j.powtec.2023.118830

Ruiqi Bai , Tuo Zhou , Man Zhang , Shahong Zhu , Hairui Yang

引用次数: 0

Abstract

In this paper, the erosion characteristics in a circulating fluidized bed (CFB) were investigated on time scale with Euler-Lagrange model based computational particle fluid dynamics (CPFD). By analyzing average erosion rate data, two different erosion characteristics were found. In addition to the common linear erosion caused by downflow particles, another type of erosion is characterized by step growth and is caused by upwelling particles. Linear erosion at the height of 0.1 m is close to that at 0.2 m from the air distributor, but the value of stepped erosion at 0.1 m is much greater than that at 0.2 m. The simulation results show that stepped erosion is the main cause of erosion in the simulated object, accounting for about 70% of the total erosion. The present numerical study implies that the special gas-solid flow of CFB will bring different characteristics of erosion, and the anti-wear method should be targeted at the causes of erosion.

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基于CPFD方法的循环流化床冲蚀时间尺度研究

利用基于欧拉-拉格朗日模型的计算颗粒流体力学(CPFD)，在时间尺度上研究了循环流化床(CFB)的侵蚀特性。通过对平均侵蚀速率数据的分析，发现两种不同的侵蚀特征。除了常见的由下流颗粒引起的线状侵蚀外，还有一种由上升流颗粒引起的侵蚀，其特征是阶梯式生长。0.1 m处的线状冲蚀与0.2 m处的线状冲蚀接近，但0.1 m处的阶梯冲蚀值远大于0.2 m处。模拟结果表明，阶梯式侵蚀是模拟对象侵蚀的主要原因，约占侵蚀总量的70%。本文的数值研究表明，循环流化床特殊的气固流动会带来不同的冲蚀特性，抗磨方法应针对冲蚀的原因。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.