For designing or optimizing a pneumatic conveying system, a number of key parameters must be considered. This article summarizes the key requirements for calculating gas flow and air mass flowrate, to optimize pneumatic conveying of bulk powders and particulates. In determining the air requirements for any pneumatic conveying system, the first step is calculating the minimum conveying-air velocity required to keep the material flowing and prevent blockage of the pipes. Compressibility of air and its influence to volumetric flowrate is to consider using physical constants and equations mentioned in this paper. Volumetric flowrate is required for specifying the blower or compressor. The diameter of a pipeline has the most significant effect of any single parameter on volumetric flowrate. The flowrate used in equations for actual calculations is always related to a given temperature and pressure. The air mass flowrate will remain constant at any section along a pipeline. The relationship between mass and volumetric flowrate, pressure and temperature for a gas can be determined from the ideal gas law. The influence of air pressure and pipe bore to volumetric flowrate is illustrated in graphs. Also illustrated is the situation for suck-blow systems in a combined positive- and negative-pressure system. Detailed explanations and tips for calculation are given also for dilute-phase conveying, dense-phase conveying, and vacuum conveying. The comparison of velocity profiles in single- and stepped-bore pipelines, in both conveying and purging modes is discussed and shown in graphs just as the influence of air temperature on conveying air velocity, the influence of solids loading ratio on equilibrium temperature of suspension, and the influence of plant elevation on local value of atmospheric pressure.
Optimizing pneumatic conveying. Gas flowrate and other variables are critical
Optimierung der pneumatischen Förderung
Chemical Engineering, New York ; 107 , 13 ; 74-80
2000
7 Seiten, 10 Bilder, 1 Tabelle, 3 Quellen
Aufsatz (Zeitschrift)
Englisch
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