A new transient nonuniformity index for the feed injection zone of a multiphase fluidized bed reactor

IF 4.3 2区 材料科学 Q2 ENGINEERING, CHEMICAL
Shuangzhu Kong , Min Cai , Jian Li , Feng Cheng , Chunxi Lu , Mengxi Liu , Chaowei Liu , Zhifeng Wang , Kaijun Hou
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Abstract

In the feed injection zone of a multiphase fluidized bed reactor, nonuniform distribution exists due to the introduction of feed nozzle jets and circulating catalyst, which ultimately have an impact on the performance of the reactor. The transient sectional nonuniformity index (TSNI) is proposed as a new index to quantify the nonuniformity of solid distribution in both radial and circumferential dimensions at the same time, based on the transient solids holdup data in the feed zone. The temporal and spatial distributions of TSNI can more accurately reflect the changes in the real-time gas-solid distribution uniformity of the cross-sections and the efficiency of gas-solid contact in the feed injection zone. The feed injection zone can be divided into three regions according to the characteristics of TSNI: the bubble-influenced zone, the jet-influenced zone, and the acceleration zone. According to the numerical simulation results, it was analyzed that TSNI is highly correlated with operating conditions, such as nozzle gas velocity and catalyst circulation rate.

Abstract Image

多相流化床反应器进料区的一种新的瞬态不均匀性指标
在多相流化床反应器进料喷射区,由于进料喷嘴射流的引入和循环催化剂的存在,存在不均匀分布,最终影响反应器的性能。基于进料区瞬态固体含率数据,提出了瞬态截面非均匀性指数(TSNI),作为同时量化径向和周向固体分布不均匀性的新指标。TSNI的时空分布更能准确反映进料区截面实时气固分布均匀性和气固接触效率的变化。根据TSNI的特点,可以将进料喷射区划分为气泡影响区、射流影响区和加速区三个区域。根据数值模拟结果分析,TSNI与喷嘴气速、催化剂循环速率等工况高度相关。
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来源期刊
Particuology
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.
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