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

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International Journal of Mining Science and Technology 2022年第1期32卷 215-224页

作者： Jintuo Zhu Xinjian He Liang Wang Xiaoxue Liao Guangping Teng Pengli Jing Key Laboratory of Gas and Fire Control for Coal Mines(China University of Mining and Technology) Ministry of EducationXuzhou 221116China National Professional Laboratory for Fundamental Research of Mine Gas and Dust Control Technology School of Safety EngineeringChina University of Mining and TechnologyXuzhou 221116China School of Safety Engineering China University of Mining and TechnologyXuzhou 221116China

High humidity and high dust concentration in deep coal mines may severely challenge the performance of respirators worn by coal miners.This paper aims at quantitatively evaluating the respirators used in deep coal mines and providing scientific guidance for the respiratory protection of miners.Based on the self-designed in-situ PM2.5 collector,controllable PM2.5 generator,human breathing simulator,and respirator simulation testing system,under the simulated deep mine working condition,this study investigated the effects of dust loading,wearing time,and dust concentration on the filtration efficiency,breathing resistance,and quality factor of N95 elastomeric respirators.With the increase of dust loading,the respirator filtration efficiency firstly decreased,then increased(minimum value 97.5%).The breathing resistance increased exponentially from 120 to 180 to 1020-1530 Pa,and the quality factor decreased logarithmically from 0.051 to 0.076 to 0.0058-0.0085 Pa^(-1).As the PM2.5 coal dust concentration increased from 5 to 50 mg/m^(3),the wearing time for the respirator breathing resistance to exceed 300 Pa reduced from 7 h to less than 1 h.One N95 elastomeric respirator is not able to perform an 8-h work shift.To avoid the excessive breathing resistance caused by dust loading,more filter cartridges are needed for coal miners.

关键词： Coal dust Respirator Dust loading filtration efficiency Breathing resistance

filtration characteristics of granular bed with layered drawers for removing dust from gas streams

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Particuology 2021年第2期19卷 191-198页

作者： Shaowu Yin Xu Wang Yanping Guo Li Wang School of Energy and Environmental Engineering University of Science and Technology BeijingBeijing 100083China Beijing Key Laboratory of Energy Conservation and Emission Reduction of Metallurgical Industry University of Science and Technology BeijingBeijing 100083China

filtration tests were conducted on a granular bed filter with layered drawers filled with corundum particles with sizes between either 1 mm and 1.5 mm or 2 mm and 3 mm or with quartz sand particles with sizes between 0.125 mm and 1.5 mm.filtration velocity,filter particle thickness,and filter particle size were all found to influence the filtration efficiency and the pressure drop of both the fixed granular bed and the layered-drawer granular bed.Granular strata with different thickness ratios also strongly influenced the filtration efficiency and pressure drop.For a granular bed with two sizes of filter particles,the coarse granules in the upper layer capture dust with large particle sizes,while the fine granules in the lower layer capture dust with smaller particle sizes that passes through the filter cake and upper layer.Optimal operating conditions were determined at which the filtration efficiency was found to be 99.42%with a bed pressure drop of 320 Pa.

关键词： Fixed granular bed filtration efficiency Pressure drop Two-component filtering particles

Meltblown fabric vs nanofiber membrane, which is better for fabricating personal protective equipments

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Chinese Journal of Chemical Engineering 2021年第8期34卷 1-9页

作者： Junwei Wu Hongjia Zhou Jingyi Zhou Xiao Zhu Bowen Zhang Shasha Feng Zhaoxiang Zhong Lingxue Kong Weihong Xing State Key Laboratory of Materials-Oriented Chemical Engineering National Engineering Research Center for Special Separation MembraneNanjing Tech UniversityNanjing 210009China Jiangsu Jiulang High-Tech Co. LtdNanjing 210009China Department of Material and Chemical Engineering Soochow UniversitySuzhou 215006China Institute for Frontier Materials Deakin UniversityGeelongVictoria 3216Australia

The coronavirus disease 2019(COVID-19)pandemic has led to a great demand on the personal protection products such as reusable masks.As a key raw material for masks,meltblown fabrics play an important role in rejection of aerosols.However,the electrostatic dominated aerosol rejection mechanism of meltblown fabrics prevents the mask from maintaining the desired protective effect after the static charge degradation.Herein,novel reusable masks with high aerosols rejection efficiency were fabricated by the introduction of spider-web bionic nanofiber membrane(nano cobweb-biomimetic membrane).The reuse stability of meltblown and nanofiber membrane mask was separately evaluated by infiltrating water,75%alcohol solution,and exposing under ultraviolet(UV)light.After the water immersion test,the filtration efficiency of meltblown mask was decreased to about 79%,while the nanofiber membrane was maintained at 99%.The same phenomenon could be observed after the 75%alcohol treatment,a high filtration efficiency of 99%was maintained in nanofiber membrane,but obvious negative effect was observed in meltblown mask,which decreased to about 50%.In addition,after long-term expose under UV light,no filtration efficiency decrease was observed in nanofiber membrane,which provide a suitable way to disinfect the potential carried virus.This work successfully achieved the daily disinfection and reuse of masks,which effectively alleviate the shortage of masks during this special period.

关键词： filtration efficiency Meltblown fabrics Nano cobweb-biomimetic membrane Reusable mask

Modeling the performance of air filters for cleanrooms using lattice Boltzmann method

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Building Simulation 2021年第2期14卷 317-324页

作者： Bin Zhou Xiao Wu Long Chen Jia-Qi Fan Lan Zhu Department of HVAC College of Urban ConstructionNanjing Tech University211816NanjingChina National Air Cleaner&Gas Detect Production Quality Supervision and Inspection Center(Jiangsu) SuzhouChina

Air filters with a low resistance,high filtration efficiency,and long lifetime are important to ensure good indoor air quality.In this study,the lattice Boltzmann method is applied on six types of fibrous filter media with lognormal-distribution models,which consider the influence of the solid fraction,number of fibers,and average fiber diameter.The influences of the filtration velocity and fiber layout on the resistance,efficiency,and quality factor are discussed.The resistance is found to be relatively low when the solid fraction inside the filter media is uniformly distributed.The filter media with a random lognormal-distribution model demonstrated the best filtration performance in terms of quality factor.However,when the solid fraction is uniform along the thickness of the filter media,the comprehensive filtration performance is the best when a small fiber is near the inlet and a large one is close to the outlet.This study provides a viable numerical method for performance optimization of air-filtration devices for the next-generation cleanroom industry.

关键词： LBM resistance filtration efficiency numerical simulation quality factor

Preparation of High-precision Electrospun Nanoair Filter Paper for Air Purification

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Paper And Biomaterials 2021年第4期6卷 12-20页

作者： Weiyin Su Lanfeng Hui Xiaoyan Ma Lingyuan Wang Yu Wang Tianjin Key Lab of Pulp&Paper Tianjin University of Science and TechnologyTianjin300457China

Electrospinning technology has become a research hotspot becauseof its advantages, such as simple operation, low cost, large specific surfacearea, high porosity, and good fiber continuity. Here, a new type of compositenanoair filter paper was prepared using electrospinning technology. Toimprove the practicability of air filter base paper, phenolic resin was used as acuring agent to improve the strength. The results show that the electrospunnanoair filter paper with air filter paper as the receiving substrate andpolyvinyl alcohol (PVA) solution as the spinning solution excellentlyperformed in all aspects. The influence of the thickness (spinning time) of thePVA nanofiber membrane on the micromorphology, physical properties, andfiltration performance of the electrospun nanoair filter paper was analyzed.According to the ISO 5011-2014 standard, the initial resistance, filtrationefficiency, mean pore size, and dust capacity of the electrospun nanoair filterpaper were 77.3 Pa, 99.9941%, 3.50 μm, and 146 g/m^(2), respectively, when thespinning time was 15 min.

关键词： electrospinning technology electrospun nanoair filter paper polyvinyl alcohol(PVA) initial resistance filtration efficiency

An indoor air aerosol model for outdoor contaminant transmission into occupied rooms

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Journal of Chongqing University 2014年第1期13卷 33-42页

作者：谢慧赵申 CAO Guo-qing School of Mechanical Engineering University of Science & Technology Beijing Institute of Building Environment and Energy efficiency China Academy of Building Research

The paper presents a simple model for outdoor air contaminant transmission into occupied rooms. In the model, several factors such as filtration, ventilation, deposition, re-emission, outdoor concentration and indoor sources are included. The model results show that the air exchange rate plays an important role in the transmission of outdoor contaminants into the indoor environment. The model shows that increasing the value of the filtration efficiency decreases the mass concentration of indoor particles. In addition, if outdoor aerosol particles have a periodic behaviour, indoor aerosol particles also behave periodically but smoother. Indoor sources are found to be able to increase indoor concentrations greatly and continuously.

关键词： particulate matter indoor and outdoor particle concentration air exchange rate transmission filtration efficiency

Study on Influencing Factors of Filtrating Properties of the Polypropylene Woven Filter Cloth

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Study on Influencing Factors of Filtrating Properties of the...

Gasoline Catalytic Emission Control Technologies to Meet China 6b RDE Requirements

绿色纺织，健康生活——第三届纺织生物工程及信息学国际会...

作者： Hong-Jie Zhang1 Zhi-Li Zhong1 Li-Li Feng 1 Xiao-Ping Quan2 1School of Textile Tianjin Polytechnic University Tianjin 300160 China 2Luoyang Petrochemical Hongda Industry General Company Luoyang 47100 China

Several filter sample cloths were woven using polypropylene monofilament and the multifilament as raw material. The filter sample cloth designs utilized different yarn arrays for surface and back textures, yarn linear densities as well as distinct textile weaves. The permeability, abrasion resistance and air permeability of these sample cloths were measured. The filtration resistance was evaluated indirectly, through the self-tester （Flow Tester）. How the yarn arrays for surface and back textures, yarn linear densities, textile weave Influence of the filtrating properties of the sample cloths were investigated based on the above experiment. Experimental results show that when the array of the face warp and the back warp was 1:1, the face weft and the back weft was 2:2, the organization of fabric surface was 2/2 twill, back weave was 1/3 twill, the permeability of the filter fabric was 719 L/m2.s, the wear weight loss rate was only 0.21%, and the flow rate was 75, the relative filtration resistance was smaller.

关键词： woven filter cloth law of logarithmic penetration filtration efficiency permeability water permeability abrasion resistance.

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Gasoline Catalytic Emission Control Technologies to Meet Chi...