Pneumatic Conveying System Design Procedures

Mills, David

doi:10.1016/b978-0-408-04719-7.50008-0

Cited by 13 publications

(22 citation statements)

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“…The fluidized mode transportation of granular matter through an enclosed channel, having a porous fabric at its base through which air trickles up, is referred to as fluidized motion conveying. In addition to having the inherent advantages of pneumatic conveying systems such as low cost, flexible routing, low maintenance, enclosed nature, and environmental hygiene (Mills 1990;Wypych & Yi 2003), this system also yields the advantages of dense phase pneumatic conveying, i.e., higher mass flow rate, reduced duct wear and particle attrition, and greater energy efficiency as well (Hong et al 1993;Levy 2000;Molerus 1996). Early industrial applications of such systems were made by the German company Polysius, the American company Huron Portland Cement Company, and the Fuller Company for transporting cement, however, the typical large installation described in the literature involved the transportation of alumina (Bushell & Maskell 1960;Butler 1974;Leitzel & Morrisey 1971), as reported by Woodcock and Mason (1987).…”

Section: Introductionmentioning

confidence: 99%

Parameters Affecting Fluidized Motion Conveying of Fly Ash

Gupta

Agarwal

Singh

et al. 2009

Particulate Science and Technology

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A fluidized motion conveying system (FMCS) that conveys particulate material over a distance of 7.5 m was developed to investigate the influence of operating parameters on the material mass flow rate and bed depth. The effect of channel length (varied over 7.5 m, 5.5 m, and 3.7 m) was also investigated in relation to the observed variables. It is found that, for a given superficial air velocity, increase in conveying distance reduces the channel conveying capacity at all conveyor inclinations. The effect of superficial air velocity and channel inclination on material mass flow rate and bed depth, however, remains the same as reported earlier for 3.7 m channel length. The predicted material mass flux and operating superficial air velocity did not agree with the experimental data, thus, the empirical relations applicable to the design of air gravity conveyors for optimum yield were not valid for the design of FMCS.

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Section: Introductionmentioning

confidence: 99%

Parameters Affecting Fluidized Motion Conveying of Fly Ash

Gupta

Agarwal

Singh

et al. 2009

Particulate Science and Technology

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“…Wypych and Yi 7 put forward a set of models to predict the blockage of powder mechanics in the case of low‐velocity slug flow with granular materials. Mills 8 illustrated the relationship between inlet air velocity and solid loading ratio by a graph. Although the critical conditions to suppress flow blockage have received much attention from many researchers, flow blockage is stalling a potential engineering problem, and the pipeline is very prone to blockages when the slug flow is unstable 9 .…”

Section: Introductionmentioning

confidence: 99%

Study on mass at the bottom of the pipe and gas velocity distribution during flow blockage collapsing under pipe‐rotation mechanism

Jia

Feng

2020

Asia-Pacific J Chem Eng

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The flow blockage of the horizontal pipe is a severe problem in dense pneumatic conveying; accelerating the collapse of blockage can improve the efficiency of powder transportation. In this paper, the pipe-rotation mechanism was proposed for the first time, and its effect on blockage collapse was preliminarily discussed. A horizontal pipe-rotation geometry with a linear variation of rotating speed was established, and the rotational speed was 0, 150, 300, 450, and 600 rpm, respectively. The collapsing process of a single slug passing through the rotating horizontal pipe was simulated by using the Computational fluid dynamics (CFD)-discrete element method (DEM) model. The change of mass at the bottom of the pipe and gas velocity distribution was studied. It was found that, in the prophase of flow, centrifugal force is more dominant than circumferential friction; in the anaphase of flow, the opposite is true. In terms of gas velocity distribution and pressure distribution, pipe rotation with different speeds has the same action law to flow blockage collapse. Moreover, 300 rpm was found to be the optimal speed in our study, instead of the faster ones. It is trusted that the method reported in this paper will serve as a helping source for the upcoming studies towards the slug collapse of dense-phase pneumatic conveying.

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“…9. Pressure drop through a bed of particles versus superficial air velocity -source: (Mills, 1990). (1 ) …”

Section: Minimum Fluidization Velocity Calculationmentioning

confidence: 99%