Development of double-circuit closed-loop dedusting system for increasing the atmosphere safety level
DOI:
https://doi.org/10.15276/opu.3.56.2018.11Keywords:
environmental safety, aspiration cleaning system, dispersed composition of dust, differential distribution curve, catching factorAbstract
Technological processes of numerous industries are sources of polydisperse dust emissions into the working areas and the environmental air. Directive 2008/50/EC establishes strong enough requirements for the content of PM10 and PM2.5 solids, but namely such fractions constitute the main of the dust slippage of traditional dust collectors. Therefore, efficiency increase of fine particles removal in the dedusting aspiration systems is an extremely valuable and timely task. The purpose of this article is to increase the level of environmental safety of atmospheric air in areas of close placement of industrial and residential areas by the modernization of the aspiration system. The article proposes the replacement of a traditional direct-flow system with a dual-circuit closed-loop. The ecological effect is achieved due to separate cleaning of dust with different grain-size distribution and complete isolation of the system from the environment. Applying the developed method of calculating it is possible to estimate the values of exploitable parameters for certain system, particularly, capture efficiency of dust in the main and recirculation devices, the grain-size distribution of the dust on different units of system. The effectiveness of the main catcher is 92 %. Method of parameters assessment was used to calculate the aspiration system for cleaning air from the working rooms of crushing building materials. Differential distribution curve based on the dispersed analysis was drawn for dust entering the cleaning system. Method had allowed us to draw distribution curves of the grain–size dispersed composition for all flows of the system, as well as the dynamics of efficiency of the main devices and circulation catcher during the described period of work. The geometrical parameters of dry inertial devices for the main and circulation circuits are proposed. It is concluded that the extremely high efficiency of the dry inertial device, unlike traditional dry dust collectors, is achieved by controlling the dispersed composition of the dust moving along the cleaning system.
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References
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