大型船舶源排放颗粒物谱分布特征

The Size Distribution Characteristics of Particulate Matter Emitted from A Large Ship Source

为了解大型船舶源排放颗粒物的谱分布特征,进行了登船实测试验,使用静电低压撞击器测定船舶在停泊、机动和巡航工况下颗粒物的谱分布特征,结果表明:颗粒物的谱分布主要依赖燃油品质,同种燃油时颗粒物的数浓度、表面积浓度和体积浓度谱分布分别呈相似的变化趋势;燃用柴油,颗粒物数量主要集中在爱根核模态和积聚模态;燃用重油,颗粒物数量主要集中在核模态和爱根核模态;燃油硫含量的降低可以有效降低颗粒物质量排放,对数量排放也有一定的抑制作用;燃用重油会增加颗粒物全尺寸粒径范围内的数量和质量排放,对数量的增加主要体现在核模态,对表面积和质量的增加体现在粗粒子模态.

In order to understand the size distribution characteristics of particulate matter emitted from a large ship source,the actual boarding test was conducted.The size distribution characteristics of particulate matter emitted from a large ship source were determined at berthing,maneuver and cruise conditions using by the Electrical Low Pressure Impactor.The results showed that the size distribution of particulate matter mainly depended on the fuel quality.The number concentration,surface area concentration,and volume concentration size distribution respectively showed similar trends at the same fuel oil.Diesel fuel used for combustion,the particle number was mainly concentrated in the Aitken mode and accumulation mode.Burning with heavy oil,the number of particles was mainly concentrated in the nuclear mode and Aitken mode.The sulfur reduction of fuel could effectively reduce the mass emission of particulate matter,it also had a certain inhibitory effect on quantitative emission.Burning heavy oil could increase the quantity and mass emission of particulate matter within the all size,the increase of the particle number was mainly reflected in the nuclear mode,the increase of the particle surface and mass was reflected in the coarse mode.