Emission Characteristics Of Particulate Matter And Gasous Pollutants From Domestic Fuels Combustion In Yunnan Province

Domestic fuels include indoor coal,straw,wood and so on generally.Coal,wood and straw are relatively easily available in rural areas,so large consumptions of these fuels for cooking and heating in people's daily lives in rural areas of Yunnan Province.Because of poor combustion conditions and without particle-controller,these fuels combustion would emission higher pollutant,as well as adverse effects on human health.There are limited studies focusing on the emission characteristics of domestic fuels combustion and emission estimation in China.The altitude of Yunnan Province is 1500?2000m.The higher altitude would lead atmospheric pressure is lower than the flat area.This is bound to cause the characteristics of particulate matters emitted from fuels combustion and the gas-particle partitioning of PAHs are different from plain areas.In this study,we choose honeycomb coal which is from Jinning of Yunnan Province and pine to conduct the combustion experiments in indoor.We obtain the emission factors and composition characteristics of particulate matter and gaseous pollutants form Domestic fuels combustion in Yunnan Province.The main conclusions are as follows:(1)Emission factors of particulate matter from honeycomb coal burning and smouldering were 0.67±0.11 g/kg and 0.94±0.20g/kg.respectively.The emission factor of particulate matter from wood was 2.02±0.64g/kg.PM1 also contributed the largest proportion,which accounting for more than 50%of total particulate matter.(2)The higher emission factors of elements in the particulate matter from honeycomb coal burning and smouldering were Al,Ti.Fe,Ca,Si,Zn,Pb,K,Mg,Na,The range of emission factors of these elements was 0.22?15.17mg/kg.The highest Emission factors of 10 elements from wood were Si,Ti,Fe,Al,K.Mg,Ca,Sb,Na,Ba.The range of emission factors of these elements was 0.87?177.95mg/kg.(3)Beacause of the proportion of N in wood is higher than honeycomb coal,and the proportion of s in wood is lower than honeycomb coal.The proportion of SO42 in the particulate matter emitted from the honeycomb coal is higher.But wood combustion would emit more NO3-.Beacause of smouldering make oxygen concentration and combustion efficiency decreasing.The SO42-in the particulate matter from the honeycomb coal smouldering was higher than honeycomb coal burning.While the honeycomb coal burning would emit more NO3-than honeycomb coal smouldering.(4)The total emission factors of 16 polycyclic aromatic hydrocarbons(PAHs)emitted from honeycomb coal burning and smouldering were 4.42±0.75mg/kg and 6.01 ± 1.37mg/kg,respectively.The total emission factor of 16 PAHs emitted from wood combustion was 8.45±1,41mg/kg.PM1 emitted from domestic fuels combustion contains most of the PAHs,which accounting for 70%to 90%of the total PAHs in the particles.PAHs species with larger molecular weight are more likely to be enriched in fine particles.(5)Compared with previous studies,the proportion of the particle phase of PAHs from domestic fuels combustion is higher in this study.Beacause of the lower oxygen environment in Yunnan Province,the combustion efficiency of domestic fuels were lower than Plain area.Incomplete combustion would make fuels burning emited more PAHs in Carbon particles,which resulting in the more proportion of the particle phase of PAHs from domestic fuels conbustion.(6)The emission factor of the total VOCs emitted from the honeycomb coal burning was 8.34±1.20mg/kg;the emission factor of the total VOCs from honeycomb coal smouldering was 10.79±5.65mg/kg.The emission factor for total VOCs emitted from wood was 9.98±2.43mg/kg.(7)The OFP of VOCs from wood was higher than honeycomb coal.When we study on source of O3 pollution,we should consider the contribution of wood combustion.