Compilation Of Pollutant Discharge Inventory And Pollution Characteristics Analysis Of Cement Industry In Shaanxi Province

The optimization of regional environmental air quality is the focus of current hot research.Understanding the current situation and characteristics of air pollution in the study area is fundamental to better formulate pollution reduction and emission reduction measures.Therefore,this study will collect specific operation data of key industry of air pollution--cement industry through different enterprises.In addition,the emission data of major air pollutants(SO₂,NO_X,PM_2.5and PM₁₀)generated in the operation process of each enterprise are calculated,and the air pollutant discharge list of Shaanxi cement industry is compiled,and then the WRF/CALPuff coupling model is adopted to simulate the data.The spatial distribution and emission concentration of air pollutants in Shaanxi cement industry are obtained,and the spatial and temporal analysis is carried out to find out and analyze the pollution emission status and characteristics.Through the analysis of policies and related documents,the emission reduction scenario of air pollutants in the cement industry is focused on.This paper also briefly estimated and predicted the total direct CO₂ emission from cement clinker production of various enterprises in various regions of Shaanxi Province,which can provide decision support for relevant functional departments to formulate pollution reduction measures or development plans.The main research conclusions of this paper are as follows:1.Using data collection method,mathematical statistics and"top-down"emission factor method,the emission inventory of air pollutants for the cement industry in Shaanxi province was constructed;,according to the results on the pollutant emissions:the cement industry of shaanxi province atmospheric pollutants emission inventory statistics,according to the results of shaanxi province in 2018 the total emissions of SO₂,NO_X,and PM₁₀and PM_2.5were 9.513×10³、30.707×10³、4.352×10³and 1.801×10³tons,the main pollutant for NO_X,cement industry accounts for half of the total pollutant emission,the guanzhong plain total discharge of major pollutants more than half of the whole area,66%.2.On this basis,based on WRF/CALPUFF coupling model method,the concentration distribution characteristics of SO₂,NO_X,PM_2.5and PM₁₀,the major air pollutants in the cement industry of Shaanxi province,were simulated and studied.The results showed that the annual average concentrations of SO₂,NO_X,PM_2.5and PM₁₀were 0.11μg/m^-3、0.43μg/m^-3、0.03μg/m^-3and 0.07μg/m^-3,The highest concentrations of SO₂,NO_X,PM_2.5and PM₁₀pollutants in the cement industry accounted for 48.67%,59.86%,61.92%and 60.23%,respectively,in The Guanzhong Plain.In The Guanzhong Plain,the concentration contribution of all cities is relatively concentrated,and the cumulative concentration of the four pollutants in Tongchuan city is the highest,which is 0.36μg/m^-3、1.71μg/m^-3、0.10μg/m^-3、0.22μg/m^-3respectively.The emission concentration of air pollutants from the cement industry of Shaanxi province contributes a certain amount to the air quality of the province,among which NO_Xcontributes the most,reaching 1.72%,followed by SO₂,PM₁₀and PM_2.5,which are 1.11%,0.10%and 0.09%respectively.On the whole,the distribution of pollutants in cement industry in Shaanxi shows a trend of"high in Guanzhong,low in north and south".3.Secondly,two emission reduction scenarios are set:End-treatment technology optimization scene in winter and summer peak production implementation of the scene,and through the WRF/CALPUFF coupling model assessment method for emission reduction effect,the results found that emissions compared before concentration distribution,reduction after strong alleviate the pollution situation of cement industry,around the city by improving the terminal treatment technology can effectively improve water purification effect;The average monthly emission reduction efficiency of winter,spring,summer and autumn is 68.55%,72.3%,71.5%and72.67%,respectively.Compared with the current emission situation,the average emission reduction intensity of pollutants can reach about 71.25%,and the emission reduction efficiency of the whole province is 0.24%,which is very impressive.Compared with the concentration distribution before emission reduction,emission reduction has effectively alleviated the pollution situation in all cities of Shaanxi Province.On the other hand,it is found that the average emission reduction efficiency of the four types of pollutants in summer and winter（July and January）can be effectively reduced by cross-peak production,and the average emission reduction efficiency is 38.66%and 35.89%respectively.For the whole year,it can basically reduce the emission of pollutants by 37.27%,and the emission reduction efficiency of the whole province is 0.16%.Compared with the concentration distribution before the emission reduction,the emission reduction has effectively alleviated the pollution situation of all cities in Guanzhong in winter and summer（July and January）of Shaanxi Province,and also improved the overall air quality of Shaanxi Province to a certain extent.4.Estimated by prediction model,this paper obtained the shaanxi province each region cement clinker manufacture CO₂ emissions directly,which,in 2018 in shaanxi province cement clinker production CO₂ emissions directly around the city a total of50.6978 million tons,the guanzhong region a total of 40.1624 million tons,the maximum emissions account for 79.22%of the CO₂ emissions of cement industry in shaanxi,the tongchuan city emissions,the largest of 12.7119 million tons,accounting for 25.07%of the total emissions;Southern Shaanxi discharged 7.8572 million tons,accounting for 15.50%of the total;The total emission from northern Shaanxi was only2.6781 million tons,accounting for 5.28%of the total.