广西内河及沿海船舶大气污染物排放清单及特征研究

Study on the emission inventory and characteristics of air pollutants from inland and coastal ships in Guangxi

基于广西船舶数量及类型、船舶引擎功率等数据,以广西壮族自治区为例,通过船舶引擎功率法建立广西2020年内河及沿海船舶排放清单,探究广西内河及沿海船舶主要大气污染排放量时空分布,并通过大气扩散模型模拟了船舶大气污染物排放对广西沿海港区大气环境的影响。结果表明:内河船舶中干货船排放占比为35.6%,四等船排放占比为26.07%;沿海船舶中拖船排放占比为44.16%~49.33%,主机、辅机、锅炉排放占比分别为52.39%、21.43%、26.18%;不同工况下,沿海船舶停泊工况SO_(2)排放占比最高,其余污染物在慢速行驶工况下排放占比最高。2020年广西北部湾海域船舶SO_(2)、NO_(x)、HC、CO_(2)的平均排放强度分别为0.32、2.14、0.07、121.93 t/km^(2)。

Based on the data such as the number and types of ships in Guangxi,and the power of ship engines,taking Guangxi Zhuang Autonomous Region as an example,the ship engine power method was used to establish the 2020 Guangxi inland and coastal ship emission list,and to explore the spatial distribution of the main air pollutant emissions from inland and coastal ships in Guangxi in 2020.The impact of ship air pollutant emissions on the atmospheric environment of Guangxi coastal port areas was simulated using an atmospheric diffusion model.The results showed that the dry cargo ships contributed 35.6%of the emissions from inland vessels,while the fourthclass ships accounted for 26.07%of the emissions.The contribution of tugboat emissions to coastal ships was 44.16%-49.33%,with emissions from main engines,auxiliary engines,and boilers being 52.39%,21.43%,and 26.18%,respectively.Under different operating conditions,Coastal ship berthing conditions account for the highest percentage of SO_(2) emissions,while for other pollutants the highest emissions were observed in slow-driving conditions.In 2020,the average emission intensity of SO_(2),NO_(x),HC,and CO_(2) from ships in Beibu Gulf of Guangxi was 0.32,2.14,0.07,121.93 t/km^(2),respectively.