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There has always been interest in the most precise answer to the question of suction hood capacity. The lack of an in-depth analysis of aerodynamic processes and properly equipped computer facilities has meant that specialists had to be content with the simplest proportions. Typically used was an empirical approach based on crude models (if not on one’s intuition) or on such vague notions as “practical data” or “countertypes.” Therefore, an answer was quite often approximate: dust exhaustive plant capacity was either assumed to be within a great margin, which contributed to lower service quality and higher power consumption, or was much lower than the required values, which decreased the sanitary and hygienic effect. This volume is devoted to studying air injection into granular material streams and to defining the closed hood capacity widely used in mechanical reprocessing of minerals. An air injection mechanism used with a solid stream has been discovered for two typical cases of bulk material flow: when transferring in closed chutes and in gravity bulking, which allowed for detailing accurate methods of aspiration volume calculation for transfer groups featuring diverse chute configurations in view of the aerodynamic connections of extract hoods.
The authors did not integrate published study findings for this subject but took a chance on familiarizing the reader primarily with findings from their own studies conducted during several years of work in the All-Union Research and DevelopmentInstitute of Occupational Safety in Metal Mining Industry (VNIIBTG, Krivoy Rog) and in the Belgorod Shukhov State Technology University (BSTU), from which the members’ support, assistance, and positive help are sincerely appreciated