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Spatio-temporal distribution of gaseous pollutants from multiple sources in industrial buildings with different flow patterns

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Building Simulation 2022年第9期15卷 1629-1644页

作者： Yingxue Cao Yi Wang Zhuolei Yu Caiwu Lu Songheng Wu Yang Yang Xiaojing Meng School of Resources Engineering Xi'an University of Architecture and TechnologyNo.13 Yanta RDXi'anShaanxi 710055China State Key Laboratory of Green Building in Western China Xi'an University of Architecture and TechnologyChina School of Building Services Science and Engineering Xi'an University of Architecture and TechnologyNo.13 Yanta RDXi'anShaanxi 710055China

Energy consumption of industrial buildings has remained continuously high,and the environmental quality requirements are also constantly *** by improving industrial environmental control technology based on the transport mechanism of the pollution,can the energy consumption of industrial building environmental control be further reduced,and the environmental quality of industrial buildings can be improved as ***,after verifying the numerical simulation by experiments,this study uses a self-label method to investigate the spatio-temporal distribution of gaseous pollutants from multiple time-series sources in industrial plants with different length-span *** results show that,the polluted flow in plants with different aspect ratios have different flow patterns:(i)the,,Back-mixingw flow pattern occurs when the ratio of ventilation rate 6 and polluted flow rate at the exhaust height b is less than 1,i.e.,G/L_(p)*** plants with the"Back-mixing"pattern,the following source pollutants enter a density stratified environment induced by the retained pre-source *** flow of following source pollutants released at the same intensity as the precursor source can reach the roof,while those with low velocity and density difference may be blocked during the ascending *** maximum height zm of the flow of the following source is related to both the initial Froude number Fr_(o)of the following source and the unsteady vertical density gradient of the fluid in the indoor environment dpa/*** plants with the,,One-way,/pattern,the flow from the following source enters into an environment with approximately uniform *** the condition of positive buoyancy,design parameters of ventilation corresponding to the vicinity of G/L_(p)=1 may be the optimal solution for safety and energy conservation.

关键词： multiple time-series sources flow pattern long and narrow industrial building industrial ventilation gaseous pollutants

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3D modeling of transformation of gaseous pollutants in the high-pressure turbine of an aircraft engine

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Propulsion and Power Research 2020年第1期9卷 1-14页

作者： Trung Hieu Nguyen Phuong Nguyen-Tri Francois Garnier Department of Mechanical Engineering École de Technologie Supérieure(ETS)MontrealQuebecH3C 1K3Canada Institute of Research and Development Duy Tan UniversityDa Nang550000Viet Nam Department of Chemistry Biochemistry and PhysicsUniversitédu QuébecàTrois-RivièresUniversity of QuebecTrois-Rivières(Québec)G9A 5H7Canada

Aircraft emissions contribute to global climate change and regional air pollution near *** the formation and the transformation of emissions in the aircraft engine is essential to properly quantify the environmental impact and air ***,precise investigation of chemical process in the turbine is challenging because of the complexity of the transformation process in the complex flow relating to the moving blade at high temperature and high *** present here,the first published model study of 3D chemical formations inside a high-pressure turbine and first time to compare three numerical solutions(1D,2D and 3D calculations)of transformation of trace species inside an aircraft *** model has simulated the evolution of principal precursor pollutant gases(NOx and SOx)and other species(hydrogen,oxygen species and carbon oxides).Our results also indicated strong dissimilarities in chemical transformations of 3D *** comparing the three solutions,the results obtained showed that the difference of mole fractions of species can be under predicted by 75%between 1D and 2D calculations and in the comparison of 2D and 3D calculation,the under predicted difference may be 90%.

关键词： gaseous pollutants High-pressure turbine Aircraft engine 3D modeling

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Characteristics of gaseous pollutants at a Regional Background Station in Southern China

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Atmospheric and Oceanic Science Letters 2014年第4期7卷 340-345页

作者： CHAO Na JI Dong-Sheng CHEN Jia-Shan XIN Jin-Yuan HU Bo WANG Yue-Si WANG Hui MENG Ze Gansu Agricultural University State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric Physics Chinese Academy of Sciences Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration Nanjing University of Information Science and Technology South China Botanical Garden Chinese Academy of Sciences

Measurements of gaseous pollutants （03, NOx, SO2, and CO） were conducted at Dinghushan background station in southern China from January to December 2013. The levels and variations of O3, NOx, SO2, and CO were analyzed and their possible causes discussed. The annual average concentrations of 03, NOx, SO2, and CO were 24.6 ± 23.9, 12.8 ± 10.2, 4.0 ± 4.8, and 348 ± 185 ppbv, respectively. The observed levels of the gaseous pollutants are comparable to those at other background sites in China. The most obvious diurnal variation of 03 was observed in autumn, with minima in the early morning and maxima in the afternoon. The diurnal variations of SO2 showed high values during the day. The diurnal cycles of NOx showed higher values in the morning and lower values during the night. Higher CO concentrations were observed in spring followed by winter, autumn, and summer. Biomass burning, in combination with the transport of regional pollution, is an important source of CO, SO2, and NOx in spring and winter. Backward trajectories were calculated and analyzed together with corresponding pollutant concentrations. The results indicate that air masses passing over polluted areas are responsible for the high concentrations of gaseous pollutants at the Dinghushan background station.

关键词： gaseous pollutants O3 NOx SO2 CO backward trajectories

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Erratum to the Influence of gaseous pollutants on Silver Artifacts Tarnishing, Vol. 6 (2017), 135-148

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Open Journal of Air Pollution 2022年第3期11卷 47-61页

作者： Yussri Salem Conservation Department Faculty of Archaeology South Valley University Qena Egypt

The original online version of this article Salem, Y. (2017) The Influence of gaseous pollutants on Silver Artifacts Tarnishing. Open Journal of Air Pollution, 6, 135-148. doi: 10.4236/ojap.2017.64011 unfortunately contains grammar mistakes. The author wishes to correct the errors. The present work investigated the effect of common gaseous pollutants on silver artifacts. The study was carried out on coupons made of a silver alloy (91 silver and 9% copper) with chemical composition similar to ancient Egyptian silver artifacts. These coupons were exposed to gaseous pollutants such as sulfur dioxide, nitrogen dioxide, carbon dioxide, hydrogen sulfide and chlorine, each gas separately. The exposure period was four weeks inside a climate chamber with 10 PPM concentration of each gas. After each test, examinations by SEM and PM were used to evaluate the effect of each gas and observe the formed tarnish layers. The results revealed that all gases reacted with the surface except carbon dioxide. The formed tarnish layers varied in coverage and density rate, and the heaviest layer was of H2S coupons. The tested coupons were analyzed by XRD and the results revealed Ag2S, AgCl, Ag2SO4, Ag(NO3)3(NO)3, AgO and Ag2O as corrosion products.

关键词： Silver Artifacts Atmospheric Corrosion gaseous pollutants

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Impact of meteorological parameters and gaseous pollutants（SO2 and NO2） on PM2.5 and PM10 mass concentrations during 2010 in Xi’an,China

Impact of meteorological parameters and gaseous pollutants（...

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十一届全国气溶胶会议暨第十届海峡两岸气溶胶技术研讨会

作者： Ping Wang JunJi Cao Yongming Han Yu Huang Shuncheng Lee State Key Lab of Loess and Quaternary Geology Institute of Earth EnvironmentChinese Academy of Sciences Department of Civil and Environmental Engineering The Hong Kong Polytechnic University

PM2.5 and PM10 mass from quartz-fiber weight were obtained in Xi’an for two weeks of every month corresponding to January, April, July and October during 2010 at upwind district of Gaoling county（GLC）, downwind background station of Black river reservoir（BRR） and four urban sites. Annual average PM2.5 and PM10 mass concentrations were 140.9 ± 108.9 μg m-3, 257.8 ± 194.7μg m-3, respectively. Seasonally, high concentrations in wintertime and low ones during summertime were attributed to seasonal variations of meteorological parameters and cycle changes of precursors（SO2 and NO2）. Stepwise Multiple Linear Regression（MLR） analysis indicated that relative humidity is the main factor influencing on meteorological parameter. Sulfate of SO2 oxidation products are concentrated in fine mode of PM2.5 and nitrate of NO2 oxidation in coarse mode of PM10. Entry MLR analysis suggested that SO2 and NO2 contributed 48.6% and 33.9%, and 17.5% and 0.7% of the total PM2.5 and PM10, respectively. Trajectory cluster results indicated long distance air mass from northwest in winter（82.1%） and in spring（67.9%）, and short distance from surrounding provinces in summer（62.5%） and autumn（73.2%）. Potential Source Contribution Function（PSCF） analysis showed three day Dust storm（DS） came from Taklimakan Desert in Xinjiang and Gobi Desert in Inner Mongolia in spring. Remote sensing retrieval（OMI UV Aerosol Index（AI）, OMI tropospheric NO2 column of Aura and Aerosol Optical Depth（AOD） of MODIS TERRA） from Giovanni online tools of NASA Goddard Earth Sciences Data and Information Services Center（GES DISC） were verified results of observation on the ground to some extents.

关键词： Xi’an PM 2.5 and PM 10 meteorological parameters gaseous pollutants MLR PSCF

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A theoretical study on gaseous pollutant flushing of natural ventilation driven by buoyancy forces in industrial buildings

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Building Simulation 2024年第4期17卷 575-589页

作者： Jiawei Zhuang Genyang Chen Rumeng Yang Kun Han Dongdong Tian Yongfa Diao Henggen Shen School of Urban Construction Changzhou UniversityChangzhou213164China School of Petroleum and Natural Gas Engineering School of EnergyChangzhou UniversityChangzhou213164China College of Environmental Science and Engineering Donghua UniversityShanghai201620China School of Architecture and Urban Planning Nanjing UniversityNanjing210093China

The acceleration of industrialization worsening indoor environments of industrial buildings has drawn more attention in recent *** ventilation can improve indoor air quality(IAQ)and reduce carbon *** evaluate gaseous pollutant levels in industrial buildings for the development of buoyancy-driven natural ventilation,two theoretical models of pollutant flushing(Model I and Model II)are developed based on the existing thermal stratification theory in combination with the mixing characteristics of lower *** results show that indoor pollutant flushing is mainly dependent on the pollution source intensity and effective ventilation *** mixing characteristics of lower pollutant has an important effect on pollutant stratification and evolution during ventilation,but it does not change the prediction results at steady *** the dimensionless pollution source intensity is larger than 1,the pollution source should be cleaned up or other ventilation methods should be used instead to improve *** addition,the comparisons between Model I and Model II on instantaneous pollutant concentration are significantly influenced by the pollution source intensity,and the actual pollutant concentration is more likely to be between the predicted values of Model I and Model *** reduce pollutant concentration to a required level,the pollution source intensity should be in a certain *** theoretical models as well as the necessary conditions for ventilation effectiveness obtained can be used for the ventilation optimization design of industrial buildings.

关键词： industrial buildings buoyancy-driven natural ventilation gaseous pollutants evolution model pollution sources

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Characteristics of air pollution events over Hotan Prefecture at the southwestern edge of Taklimakan Desert, China

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Journal of Arid Land 2018年第5期10卷 686-700页

作者： LI Jingxin WANG Shigong CHU Jinhua WANG Jiaxin LI Xu YUE Man SHANG Kezheng State Key Laboratory of Severe Weather Chinese Academy of Meteorological Sciences Beijing 100081 China Sichuan Key Laboratory of Plateau Atmosphere and Environment College of Atmospheric Sciences Chengdu University of Information Technology Chengdu 610225 China Gansu Key Laboratory of Arid Climate Change and Reducing Disaster College of Atmospheric Sciences Lanzhou University Lanzhou 730000 China Chongqing Meteorological Bureau Chongqing 401147 China

Hotan Prefecture is located at the southwestern edge of Taklimakan Desert, the world＇s largest shifting sand desert, of China. The desert is one of the main sources for frequent sand-dust weather events which strongly affect the air quality of Hotan Prefecture. Although this region is characterized by the highest annual mean PMlo concentration values that are routinely recorded by environmental monitoring stations across China, both this phenomenon and its underlying causes have not been adequately addressed in previous researches. Reliable pollutant PM_10 data are currently retrieved using a tapered element oscillating microbalance （TEOM） 1400a, a direct real-time monitor, while additional concentration values including for PM_2.5, sulfur dioxide （SO_2）, nitrogen dioxide （NO_2）, carbon monoxide （CO） and ozone （O_3） have been collected in recent years by the Hotan Environmental Monitoring Station. Based on these data, this paper presents a comparison of the influences of different kinds of sand-dust weather events on PM_10 （or PM_2.5） as well as the concentrations of other gaseous pollutants in Hotan Prefecture. It is revealed that the highest monthly average PM_10 concentrations are observed in the spring because of the frequent occurrence of three distinct kinds of sand-dust weather events at this time, including dust storms, blowing dust and floating dust. The floating dust makes the most significant contribution to PM_10 （or PM_2.5） concentration in this region, a result that differs from eastern Chinese cities where the heaviest PM_10 pollution occurs usually in winter and air pollution results from the excess emission of local anthropogenic pollutants. It is also shown that PM_10 concentration varies within wpical dust storms. PM_10 concentrations vary among 20 dust storm events within Hotan Prefecture, and the hourly mean concentrations tend to sharply increase initially then slowly decreasing over time. Data collected from cities in eastern China show the op

关键词： PM10 (or PM2.5) concentration sand-dust weather events gaseous pollutants air pollution Taklimakan Desert

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Outdoor air pollution and the onset and exacerbation of asthma

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Chronic Diseases and Translational Medicine 2021年第2期7卷 100-106页

作者： Lina Madaniyazi Seposo Xerxes Department of Paediatric Infectious Diseases Institute of Tropical MedicineNagasaki UniversityNagasaki 852-8523Japan School of Tropical Medicine and Global Health Nagasaki UniversityNagasaki S52-8523Japan

Exposure to outdoor air pollution has been consistently associated with *** this study,we reviewed the epidemiological studies published within the last 5 years on the association between outdoor air pollution and exacerbation and onset of asthma.A large number of studies have been published within the last 5 ***-term exposure to outdoor air pollution is associated with exacerbation of pre-existing asthma,manifested as worsening of symptoms and increasing of asthma-related emergency room visits and hospital ***,increasing evidence suggests that long-term exposure to outdoor air pollution can result in onset of *** are more susceptible to outdoor air *** studies should be conducted to explore the mechanisms underlying the association between air pollutants and onset of asthma,including gene *** addition,disentangling the effect of a mixture of air pollutants and identifying the key components of air pollution will complete the existing *** importantly,a better understanding is required on the future impact of air pollution on asthma under a changing climate.

关键词： Outdoor air pollution Particulate matter gaseous pollutants Asthma

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The　Vertical　Transport　of　Air　pollutants　by　Convective　Clouds　Part　Ⅱ：Transport　of　Soluble　Gases　and　Sensitivity　Tests

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Advances in Atmospheric Sciences 1994年第1期11卷 1-12页

作者：孔凡铀

A two-dimensional, non-reactive convective cloud transport model is used to simulate in detail the vertical transport and wet scavenging of soluble pollutant gases by a deep thunderstorm systems Simulations show that for gases with not very high solubility, a deep and intense thunderstorm can still rapidly and efficiently transport them from boundary layer(PBL) up to mid and upper troposphere. resulting in a local significant increase of concentration in the upper layer and a reduction in PBL. Dissolution effects decrease both the incloud gas concentration and the upward net fluxes. The higher the solubility is, the more remarkable the decrease is. However, for very low soluble gases (Hgaseous pollutants are estimated in extreme.

关键词： gaseous pollutants Pollutant transport Convective transport Numerical simulation of cumulus clouds Wet scavenging

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Health effects of air pollution:results based on the project CNMAPS(Cohort of Ningbo Morbidity and Mortality of Air Pollution Study)

Health effects of air pollution:results based on the project...

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2018环境与健康学术会议--精准环境健康：跨学科合作的挑战

作者： Jing Huang Guoxing Li Xujun Qian Guozhang Xu Yan Zhao Jian Huang Qichen Liu Tianfeng He Xinbiao Guo Department of Occupational and Environmental Health Sciences Peking University School of Public Health Ningbo First Hospital Ningbo Municipal Center for Disease Control and Prevention Institute of Mathematics ZhejiangWanli University

Objectives Air pollution is considered one of the most important risk factors for ischemic heart disease(IHD),which is a major public health *** disease burden of IHD has continued to rise in China in the past two ***,epidemiological studies examining the associations between air pollution and IHD have been scarce in China,and the only studies were conducted in severe air pollution areas,where air pollution levels seriously exceed the World Health Organization Air Quality *** the influence of air pollution on IHD in areas with relatively low levels of air pollution differs from the influence of high pollution levels in heavily studied areas was unknown until ***,the estimation of the disease burden of IHD related to air pollution has been very *** We conducted a time-series study to estimate the short-term burden of ambient air pollution on IHD using the indicator of years of life lost(YLL),based on10 322 IHD deaths from 2011 to 2015 in Ningbo,a coastal city in South *** The mean concentrations of fine particle(PM),sulfur dioxide(SO) and nitrogen dioxide(NO) were 49.58 μg/m,21.34 μg/m and 43.41 μg/m,respectively.A 10μg/m increase in PM,SO and NO was associated with changes in YLL of0.71(95%CI:-0.21,1.64),3.31(95%CI:0.78,5.84),and 2.27(95%CI:0.26,4.28)years,*** stronger impacts were found for gaseous pollutants than PM.A larger increase in YLL was found in the younger population than in the older population for NO *** addition,estimations of the effects of SO and NO on YLL were higher for males than *** exposure was positively associated with YLL in widowed *** The findings highlighted the importance of stringent air pollution control,especially for gaseous ***,using the indicator of YLL,considering the occurrence of death at different ages,provided more information for resource allocation and protection of vulnerable populations.

关键词： Ambient air pollution gaseous pollutants Ischemic heart disease Years of life lost Disease burden

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