民用煤排放PM_(2.5)中碳组分与水溶性离子特征

Emission characteristics of carbonaceous components and water-soluble ions in PM_(2.5)from residential coal combustion

研究4种典型民用煤燃烧排放PM_(2.5)中的碳组分以及水溶性离子含量特点,并通过PAM-OFR(潜在气溶胶质量-氧化流动反应器)模拟了大气老化过程(2d)对煤球与烟煤燃烧PM_(2.5)中碳组分与水溶性离子含量的变化影响.结果表明,烟煤燃放PM_(2.5)中碳组分含量最高,达到57.96%,其EC含量是其他煤种的4.3~9.6倍.民用煤燃烧产生PM_(2.5)中水溶性离子以Na^(+)与SO_(4)^(2-)为主,其在总水溶性离子中占比合计约47%~76%.经历了大气老化试验后,煤球与烟煤燃烧排放PM_(2.5)中NH_(4)^(+)和NO_(3)^(-)离子含量大幅增加,与之相比,TC占PM_(2.5)比例分别下降了12.03%与19.99%.

In this study,the characteristics of carbonaceous components and water-soluble ions in PM_(2.5)emitted from the combustion of 4typical residential coals were studied,and the effects of atmospheric aging(2d)on the content of carbonaceous components and water-soluble ions in PM_(2.5)emitted from briquettes and bituminous coal were simulated by PAM-OFR(potential-aerosol-mass oxidation flow reactor).The results showed that bituminous coal had the highest content of carbonaceous components in PM_(2.5),reaching 57.96%,and its EC content was 4.3~9.6 times that of other residential coals.The water-soluble ions in PM_(2.5)emitted by residential coal combustion were mainly Na+and SO42-,which accounted for 47%~76%of the total water-soluble ions.After the atmospheric aging,the content of NH_(4)^(+)and NO_(3)^(-)ions in PM_(2.5)emitted from the combustion of briquettes and bituminous coal increased significantly,while the proportion of TC in PM_(2.5)decreased by 12.03%and 19.99%,respectively.