Nano-size Distribution of Aerosol from Agricultural Residues Burning Matched to Optical Properties: A Laboratory Study
  • 【摘要】

    @@Laboratory measurements were conducted with a chamber to determine the size distribution and scattering coefficient of aerosol emitted from the rice straw and corn stover burning, two major agricult... 展开>>@@Laboratory measurements were conducted with a chamber to determine the size distribution and scattering coefficient of aerosol emitted from the rice straw and corn stover burning, two major agricultural residues in China. The size distributions of those rice-burned and corn-burned aerosols are well characterized by unimodal lognormal functions, with a remarkable feature of accumulation mode. The fresh smokes'''' median diameters of number distribution centered at 0.15 ± 0.03 μm, 0.22 ± 0.01 μm for rice-burned and corn-burned aerosols, respectively. PM0.5 (aerodynamic diameter less than 0.5 μm) contributes up to 91% among PM10 for rice-burned aerosols, and 99% for corn-burned aerosols. During smoke age, the median diameter of number distribution shows an approximate logarithm increase for rice-burned aerosol with the time of number concentration decreasing to the half of its initial value about 240 min from 0.15 μm to 0.27 μm. Whereas, the median diameter of number distribution shows a nearly linear increase for corn-burned aerosol with the time of number concentration decreasing to the half of its initial value about 120 min from 0.22 μm to 0.28 μm. The evolution of scattering coefficient at 545 nm matches parallel to the total surface areas per cubic centimeter of aged aerosols. It indicates smoke age is an important process to influence the size distribution and optical property of aerosols. The emission factors in particle phase are 7.7 ± 1.9 * 1015 particles kg-1 (i.e., 1.1 ± 0.7 * 106 μg kg-1), 1.2 ± 0.4 * 1016 particles kg-1 (2.2 ± 0.5 * 105 μg kg-1) for rice straw and corn stover burnings, respectively. 收起<<

  • 【作者】

    Dawei Hu  Xingnan Ye  Hefeng Zhang  Tiantao Cheng  Jianmin Chen  Zhiwei Han  Renjian Zhang 

  • 【作者单位】

    Center

  • 【会议名称】

    第五届全国环境化学大会会议

  • 【会议时间】

    2008-11-05

  • 【会议地点】

    大连

  • 【主办单位】

    中国化学会   大连理工大学

  • 【语种】

    chi

  • 【关键词】

    生物质燃烧  纳米尺寸  光学特性  排放因子  气溶胶