Study On The Characteristics Of Emission For Chemical Components In Particulate Matter From Typical Fixed Combustion Source In Yunnan Plateau

With the rapid development of our country's economy and the acceleration of urbanization construction,energy consumption mainly dominated by coal and oil is rising,resulting in frequent pollution of atmospheric particulate matter.Atmospheric particle pollution has become the primary pollution problem in major cities in China and endangered the people's daily life and physical and mental health.In order to effectively control air pollution,it is necessary to accurately determine its source,and a clear understanding of the source emission characteristics is a key link.Therefore,this study has discussed preliminarily the characteristics of flue gas particulate matter from typical fixed combustion sources in Yunnan Plateau,and established and completed the localized fixed combustion source profiles of atmospheric particles?PM10 and PM2.5?in Yunnan Plateau.It is to provide basic data for the atmospheric particulate matter source apportionment and emissions inventory in the plateau region.This paper takes the fixed combustion source of Yuxi City in Yunnan Plateau as the research object.Two-stage dilution channel sampler was used to collect industrial boilers?biomass as fuel?,industrial boilers?coal as fuel?,coke ovens,cement kilns.39 kinds of inorganic elements,9 kinds of water-soluble inorganic ions,carbon components and 16 kinds of polycyclic aromatic hydrocarbons?PAHs?in PM2.5 and PM10 samples were analyzed.The differences of the emission concentrations,mass percentages,source markers,etc of chemical components in different particle size were compared.The main conclusions were:?1?The mass concentrations of PM2.5 and PM10 in the six kinds of fixed combustion sources varied from 30 to 147.1mg/m3 and 47.5 to 392.1mg/m3,with the highest concentrations for coke oven.The concentrations of PAHs in PM2.5 and PM10 were 233.0-141.6?g/m3 and 13.8-266.9?g/m3,with the highest concentrations for coke oven;?2?SO₄^2-,OC,crustal elements,NO₃^-and trace elements had the highest proportion in the sintering machine,industrial boilers?biomass?,cement kilns,industrial boilers?coal?and steel?blast furnace?,respectively.The concentrations of total PAHs werw dominated by 4-ring PAHs;?3?In addition to the industrial boilers?biomass?,the aim of this study was to avoid the misrepresentation of the results using the difference between the larger values.The ratio of Pyr/BaP,BbF/BkF and BaA/BaP,which is the difference between the maximum and minimum values of the characteristic ratio,is selected from the 10 PAHs characteristic ratios to indicate the fixed coal source.In this study,BkF can be used as a marker for industrial boilers?biomass?,and Flu can be used as a marker for industrial boilers?coal?;?4?The cofficient of divergence indicates that most of the different sources of different particle size inorganic or PAHs component profiles may be similar,and the difference of combustion types have a great influence on the characteristics of particulate matter in fixed combustion source.But the difference in fuel types has the greatest effect on the inorganic components of PM2.5 and the PAHs composition of PM10 in the fixed combustion source.