济南市不同类型燃煤供暖企业废气组分特征及排放估算OA北大核心CSTPCD

Fine particulate matter(PM2.5)in the waste gas emitted from three types of coal-fired heating plants(thermal power,heat source,and power plants)was sampled using the dilution channel sampling method.The main components of PM2.5,as well as the emission characteristics of SO2,NOx,PM2.5,NH3,and the chemical component characteristics of PM2.5,were analyzed based on online monitoring data.The results showed that the average emission concentrations of SO2,NOx,PM2.5 and NH3 from the three types of coal-fired heating enterprises ranged from 1.01‒15.0,18.6‒39.8,0.592‒2.37,0.125‒2.00 mg·m-3,respectively,with a great difference in emission concentrations.Among them,the heat source plant using coal with low sulfur content had a significantly lower SO2 emission concentration than the thermal power and power plants.In thermal power plants and power plants,the emission concentrations of SO2,NOx and PM2.5 met the requirements of the national ultra-low emission limit,and the heat source plant met the emission standard limit requirements of local coal-fired boilers in Shandong Province.In terms of the component characteristics of PM2.5,the main components of the different types of heating plants differed significantly,with SO42-(11.8%)and OC(17.1%)for thermal power plants,Ca2+(11.6%)and OC(33.5%)for heat source plants,and SO42-(23.0%)and OC(18.6%)for power plants,all of which had much higher OC proportions than those of other regions in China.This may be related to the operating conditions of the coal quality and the environmental protection facilities of local enterprises.The high proportions of SO42-in thermal and power plants are related to the high sulfur content of the fuel.During the heating season from 2022 to 2023,the total amount of water-soluble ions in PM2.5,the component of flue gas emitted by the three types of heating enterprises in Ji'nan City,was the largest,and the total annual emission was 3.74×104 kg,which is 2.07 times that of the carbon component and 5.18 times that of the inorganic elements.The total amount of water-soluble ions emitted by power plants was the highest.The annual emission was 3.01×104 kg,accounting for 80.5%.The water-soluble ion emission of the heat source plant is 4.14 times that of the thermal power plant,and the inorganic element emission of the heat source plant was the highest,with an annual emission of 4.96×103 kg.Water-soluble ions(0.605 kg∙m-3 flue gas),carbon components(0.715 kg∙m-3 flue gas),and inorganic elements(0.161 kg∙m-3 flue gas)in the heat source plant exhibited high emission characteristics.The control of carbon components and water-soluble ions in PM2.5 from the heat source plant in winter and giving attention to the stable operation of denitration facilities are recommended.This study can provide data support for the decision-making of air PM2.5 pollution control in Ji'nan,Shandong,China.