Performance of N95 elastomeric respirators in high humidity and high coal dust concentration environment

Zhu, Jintuo; He, Xinjian; Wang, Liang; Liao, Xiaoxue; Teng, Guangping; Jing, Pengli

doi:10.1016/j.ijmst.2021.11.007

Cited by 32 publications

(14 citation statements)

References 44 publications

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“…The concentration of PM 2.5 decreases with the increase in moisture content at the same position. It indicates that increasing the moisture content through the spraying of water can inhibit the peak concentration effectively, which is similar to the conclusion obtained by other scholars [ 19 ].…”

Section: Resultssupporting

confidence: 90%

The Evaluation of Construction Dust Diffusion and Sedimentation Using Wind Tunnel Experiment

Zhang

Tang

et al. 2022

Toxics

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A large quantity of particulate matter is generated during construction of civil engineering projects, which has a negative effect on the atmosphere and environment. In order to explore the concentration, distribution and diffusion of particulate matters generated from construction dust with different moisture contents, a wind tunnel experiment was conducted, and the effects of wind speed and moisture content on the inhibition rate, drifting distance and suppression percentage of particulate matters were investigated. The results show that the peak concentration decreases with the increase in moisture content, compared with dry dust; the peak concentrations for 1%, 2% and 3% moisture content are reduced by 37.07%, 39.53% and 65.38%, respectively. The average concentrations in the cross-section decrease with the increase in the moisture content, resulting in an increasing tendency of the particle inhibition rate. The forecast drifting distance decreases with the increase in the moisture content; when the suspension percentage is 1%, the forecast drifting distances of dry dust, 1%, 2% and 3% moisture content are 641.58, 116.08, 19.33 and 3.82 km, respectively, for a 5 m/s wind speed. Considering that an increase in wind velocity will not only decrease the inhibition rate but also increase the drifting distance, the dust suppression method by increasing the moisture content in low and medium wind velocities is applicable. When the limit value of the particle suppression rate within a distance of 50 m is larger than 70%, construction activities are prohibited at any wind velocity for dry and 1% moisture content, and at wind velocities larger than 2 m/s and 4 m/s for 2% and 3% moisture content, respectively.

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Section: Resultssupporting

confidence: 90%

The Evaluation of Construction Dust Diffusion and Sedimentation Using Wind Tunnel Experiment

Zhang

Tang

et al. 2022

Toxics

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show abstract

“…In this study, NaCl aerosols with the particle size 0-200 nm were regarded as the challenge aerosols. This particle size covers the most penetrating particle size of electret filters (40-70 nm) [ 46 , 47 ], and thus can represent the most stringent testing condition for respirators.…”

Section: Methodsmentioning

confidence: 99%

“…The human breathing flow approximates the sinusoidal time-varying cyclic flow [ [48] , [49] , [50] ], and at the same mean inhalation flow, the aerosol penetration of respirator measured under the sinusoidal cyclic flow may be higher than that of the constant flow adopted in the current respirator testing standards [ [50] , [51] , [52] ]. In view of this, our research team developed a breathing simulator, which can generate sinusoidal cyclic flow and has the function of heating and humidifying the exhaled air (for more details, please see Zhu et al , 2022 [ 47 ]). In this study, three sinusoidal time-varying cyclic flow rates with mean inhalation flows of 15, 50 and 85 L/min and corresponding breathing frequencies of 12, 16, and 20 breaths/min were set as the test flow rates respectively, and the exhaled air was set to 37°C and 100% relative humidity.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Filtration efficiency of N95 filtering facepiece respirators during multi-cycles of ‘8-hour simulated donning + disinfection’

Zhu

Jiang

et al. 2022

Journal of Hospital Infection

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“…However, as long as there is coal consumption, it is necessary to produce coal, which will generate dust (Fang et al 2020, Zhou et al 2022b). Long-term inhalation by miners will cause pneumoconiosis, a chronic and irreversible fibrotic disease of the lung tissue that can cause breathing difficulties and do greatly harmful to human health (Lu et al 2022, Zhu et al 2022. As presented in Fig.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on a novel double Y-shaped filter and its dust removal characteristics

Jiang

Yuan

et al. 2023

Preprint

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For efficient and energy-saving purification of underground coal dust, a double Y-shaped filter device with a pneumatic fan as the power source was presented and tested. Numerical simulation results showed that the dust removal resistance of the double Y-shaped filter was lower than that of the conventional parallel filter. Next, filtration performance was evaluated and the morphology of water film on the filter was analyzed. It was discovered that a moderate filtration velocity was beneficial in increasing dust removal efficiency and the density of the fiber grid was proportional to the dust removal efficiency of the equipment. Conversely, an excess filtration velocity will increase the dust removal resistance and decrease the dust removal performance. According to quality factor evaluation, the optimum performance parameters for this equipment were 60 mesh density fiber grid, 0.6 MPa spray pressure, and 5 m/s filtration velocity. Under these conditions, the dust removal efficiency was 98.2%, and the dust removal resistance was 169.6 Pa. The results obtained in this study showed that this device can provide a new idea for efficient, low resistance and dust removal without electricity in underground coal mines.

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Performance of N95 elastomeric respirators in high humidity and high coal dust concentration environment

Cited by 32 publications

References 44 publications

The Evaluation of Construction Dust Diffusion and Sedimentation Using Wind Tunnel Experiment

The Evaluation of Construction Dust Diffusion and Sedimentation Using Wind Tunnel Experiment

Filtration efficiency of N95 filtering facepiece respirators during multi-cycles of ‘8-hour simulated donning + disinfection’

Experimental study on a novel double Y-shaped filter and its dust removal characteristics

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