Experimental investigation and analysis of the influence of the pipe diameter on pressure fluctuations in pneumatic conveying systems with fine bulk solids

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL Powder Technology Pub Date : 2025-04-18 DOI:10.1016/j.powtec.2025.121031

M. Dikty

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Abstract

When reducing the conveying gas velocity during the pneumatic transport of fine-grained bulk materials, the process goes through a wide variety of flow modes. If the conveying gas velocity is reduced to such an extent that a blockage occurs, the system-specific pressure limit has been exceeded. Along this reduction in velocity, there are pressure fluctuations of varying degrees, the so-called pressure pulsations. These have been intensively studied over the past 30 years, mainly about the associated flow mode. In this paper, the pressure pulsation is systematically investigated in dependence on the pipe diameter. For this purpose, conveying tests were carried out with different conveying air mass flows, starting with the dilute mode, and ending with the pipe blockage. Two different pipe diameters, 76.3 mm and 101.7 mm were investigated. The pressure values were sampled and evaluated at 5000 Hz. Criteria for assessing pressure pulsation are systematically related to the solid loading ratio (SLR), the Froude number and the Euler number based on a dimensional analysis. The resulting dependencies are evaluated qualitatively and quantitatively.

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细粒散装固体物料气力输送系统中管径对压力波动影响的实验研究与分析

在细粒状散装物料的气动输送过程中，当降低输送气速时，该过程会经历多种流动模式。如果输送气体速度降低到发生堵塞的程度，则超过了系统特定压力极限。随着速度的降低，存在不同程度的压力波动，即所谓的压力脉动。在过去的30年里，人们对这些问题进行了深入的研究，主要是关于相关的流动模式。本文系统地研究了压力脉动与管径的关系。为此，进行了不同输送空气质量流量的输送试验，从稀释模式开始，到管道堵塞模式结束。研究了两种不同管径，76.3 mm和101.7 mm。在5000hz下对压力值进行采样和评估。基于量纲分析的固体载荷比（SLR）、弗劳德数和欧拉数与压力脉动的评估标准有系统的联系。所产生的依赖关系将被定性和定量地评估。

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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.