Study On VOCs Emission Inventory And Emission Characteristics Of Construction And Installation Project In Xi’an

Volatile organic compounds(VOCs)is the key to the formation of ozone and two organic aerosol pollution precursors,it is an important factor affecting the haze in Xi’an,scientifically and accurately describing the emission characteristics of anthropogenic VOC in Xi’an is the basic research of study on formation mechanism and control countermeasures of haze in Xi’an.This paper takes Xi’an construction and installation engineering VOCs emission as the object,constructed the list of VOCs emissions from construction and installation projects in Xi’an 2014 using the emission factor method,discuss and analysis the VOCs’ sub county emission levels,spatial distribution characteristics,correlation and other pollutants,and puts forward some suggestions to control the VOCs from four different levels.First of all,identify the emission sources of VOCs for building installation projects by the Source traceability,the results are fossil fuel combustion sources and organic solvents sources,subdivide the two categories of VOCs emissions and establish a four-tier classification system,obtain VOCs emissions factor data and activity level information by means of Literature research method and Field visit,and then establish the emission list method of VOCs in construction and installation engineering of Xi’an.Secondly,based on the above construction method,obtain the VOCs emission inventory data of Xi’an construction and installation project in 2014,grids the list of VOCs emission from construction and installation project in Xi’an,sets grid resolution to1.0km*1.0km,adopts the total output value of construction industry,GDP and population density as as the distribution index,to establish the grid of the total VOCs of the construction and installation project in Xi’an and the VOCs grid list of emission source category.The spatial and temporal distribution characteristics are analyzed by the monthly change trend of VOCs in the districts and counties of xi ’an,analyze the temporal distribution characteristics from the aspects of time,population,economic development and so on.Finally,Monte Carlo method is used to analyze the uncertainty of VOCs emission inventory of construction and installation engineering in Xi’an,respectively from the two aspects of numerical VOCs activity data and emission factors,then construct evaluation system on the accuracy of the data both of them,the uncertainty analysis results of VOCs emission inventory in construction and installation industry of Xi’an:the average value of VOCs emission is 134233.5t,and the median value of VOCs emission is slightly lower than the mean value,at an average of 82.35%.The uncertainty of VOCs95% confidence interval is [-73.5%,196.83%],90% confidence interval is [-68.9%,130.5%],finally the paper carries out the correlation analysis of VOCs emissions in the construction and installation industry,SO2,NO2 and fine particles have a greater impact on VOCs,and the effect of CO on VOCs is relatively small,but it was still not negligible,while O3 is negatively correlated with VOCs.