Influence of high-speed jet on the particle distributions in downer

IF 3.8 3区工程技术 Q3 ENERGY & FUELS

Chemical Engineering and Processing - Process Intensification Pub Date : 2024-11-05 DOI:10.1016/j.cep.2024.110051

Zihan Yan , Lining Wu , Dexi Huo , Sheng Chen , Chunxi Lu

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Abstract

The large-scale cold model experiments are carried out to investigate the influence of high-speed jets on the distribution of particles in downer. The cases of both downward jets (co-current contact) and upward jets (counter-current contact) are studied. Generally, it is found that the solid holdups in the initial mixing zone of feed with particles are higher under the influence of counter-current jets, which could form the local “thickening” region in downer. To make a quantitative comparison, the radial non-uniformity index of solid holdups RNI(ε_s) in the jet mixing zone is calculated. Results show that the solid holdups in the counter-current jet mixing zone are more uniformly distributed in radial and the axial jet influence zone is shorter. By changing the jet gas velocity, its effects on the particle distributions are analyzed. Finally, based on experimental data, the distributions of solid holdups in co-current and counter-current jet influence zones of downer are formulated into formulas.

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高速射流对下料机颗粒分布的影响

通过大规模冷模型试验，研究了高速射流对下沉器中颗粒分布的影响。研究了向下喷射（同流接触）和向上喷射（逆流接触）两种情况。一般来说，在逆流喷射的影响下，进料与颗粒初始混合区的固体滞留量较高，这可能会在下料器中形成局部 "增稠 "区域。为了进行定量比较，计算了射流混合区固体滞留的径向不均匀性指数 RNI(εs)。结果表明，逆流射流混合区的固体滞留物径向分布更均匀，轴向射流影响区更短。通过改变射流气体速度，分析了其对颗粒分布的影响。最后，根据实验数据，将固体滞留物在同流和逆流射流影响区的分布公式化。

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来源期刊

Chemical Engineering and Processing - Process Intensification 工程技术-工程：化工

CiteScore

7.80

自引率

9.30%

发文量

408

审稿时长

49 days

期刊介绍： Chemical Engineering and Processing: Process Intensification is intended for practicing researchers in industry and academia, working in the field of Process Engineering and related to the subject of Process Intensification.Articles published in the Journal demonstrate how novel discoveries, developments and theories in the field of Process Engineering and in particular Process Intensification may be used for analysis and design of innovative equipment and processing methods with substantially improved sustainability, efficiency and environmental performance.