Рассмотрена многоступенчатая технологическая рециркуляция аспирационного воздуха в перегрузочные желоба ― возврат аспирируемого от укрытий технологического оборудования воздуха обратно в технологический процесс с целью снижения энергетических затрат за счет создания аэродинамического сопротивления на пути движения эжекционного воздуха и поддержания требуемых теплофизических параметров в оборудовании. Рекомендуется оснащать желоба одноступенчатыми рециркуляционными затворами с минимально возможным углом подачи воздуха навстречу потоку, эжектируемому перегружаемым сыпучим материалом, что повысит энергетическую эффективность систем вентиляции и сократит выбросы в атмосферу вредных веществ.
A dust-air flow near a vertically located rotating cylinder with a suction unit located on the lateral surface was investigated. A computer model of this suction unit was developed, the effect of disks mounted on a cylindrical surface on the intake air flow and on the capture of dust particles in the suction unit, as well as the design and operating parameters of the proposed disk cylindrical suction (DCC), which reduce the dust loss. The influence of the size and number of discs, aspiration air flow on dust removal has been established. This design of a rotating disk cylinder suction unit can be used in aspiration shelters with the function of a dust-collecting chamber. Ill. 6. Ref. 15.
The results of modeling the processes of capturing harmful emissions from galvanic baths or other tanks with an open surface are presented. An approach based on a numerical determination of the concentration of contaminated substances in the working areas of the room is proposed to evaluate the effectiveness of airborne suction. The fields of air velocity and concentration of harmful vapors in the working area are calculated. The dependence of the flow velocity around the surface of the technological solution on the distance between the surface of the solution and the lower edge of the suction is determined. It is shown that increasing the efficiency of airborne suction can be achieved by mechanical shielding --installation of impervious thin visors on the sides of the bath. The height of the mechanical screen should be about 0.5 of the width of the tank. Ill. 7. Ref. 23.
The dust dynamics in an aspiration shelter equipped with various thin mechanical screens is considered. To calculate the trajectories of dust particles, the differential equation of their motion was used, the velocity field of the air flow was calculated by the method of boundary integral equations. The influence of different mechanical screens on the maximum diameter of dust particles is determined. It is shown that when using curved mechanical screens it is possible to significantly reduce dust extraction in the suction network.
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