Research of influence of the gas filter design parameters on the protective term of respirators
Abstract
Purpose. To investigate the influence of the gas filter design parameters of respiratory personal protective equipment, which affect their real protective time.
Method. To study the influence of the of gas-filter design was used the software "SolidWorks" to clarify the calculation parameters of the developed models and modes of air flow movement. The pressure drop of gas filters was determined in laboratory conditions in accordance with the requirements of the standard DSTU EN 13274-3:2005 "Personal Protective Equipment . Test methods. Part 3. Determination of breathing resistance" method 1b.
Findings. The influence of the gas filter design parameters of respiratory personal protective equipment on their real protective time was studied. The relationship between the increase in the area of the filter surface and the outlet opening of the gas filter box, which increases the duration of the protective effect by up to 30% in a certain range of sizes of the filter boxes, was revealed. It was established that increasing the gap between the adsorbent and the down part of the gas filter box and shifting the outlet opening relative to the center of the gas filter box allows to increase the protective time within the calculated error to 5%, while the indicators stabilize after reaching a certain indicator that characterizes the considered design parameter.
Theoretical implications. A theoretical model for calculating the protective time of gas filters is proposed, which takes into account the influence of design parameters on the rate of harmful substances filtration.
Practical implications. The rational parameters of the gas filter box to ensure the maximum possible period of protective time were determined, which include the area of the filter surface of 110 cm2, the height of the filter - 30 mm, the gap between the adsorbent and the bottom wall of the filter box - at least 4 mm.
Originality. The relationship between the geometric dimensions of the gas filter box and the filtering speed was established, which made it possible to clarify the protective time of respiratory personal protective equipment.
Future research. The obtained research results can be applied in the design of new models of gas filters, as well as in theoretical studies related to the improvement of the model for determining the protective time.
Paper type. Theoretical
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References
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